Mercurial > hg > octave-lyh
annotate src/file-io.cc @ 14138:72c96de7a403 stable
maint: update copyright notices for 2012
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Mon, 02 Jan 2012 14:25:41 -0500 |
| parents | cb15c5185b6a |
| children | 2ced2f59f523 |
| rev | line source |
|---|---|
| 1 | 1 /* |
| 2 | |
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3 Copyright (C) 1993-2012 John W. Eaton |
| 1 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
| 10 option) any later version. | |
| 1 | 11 |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 7016 | 18 along with Octave; see the file COPYING. If not, see |
| 19 <http://www.gnu.org/licenses/>. | |
| 1 | 20 |
| 21 */ | |
| 22 | |
| 2095 | 23 // Originally written by John C. Campbell <jcc@bevo.che.wisc.edu> |
| 1230 | 24 // |
| 2095 | 25 // Thomas Baier <baier@ci.tuwien.ac.at> added the original versions of |
| 26 // the following functions: | |
| 1230 | 27 // |
| 2095 | 28 // popen |
| 29 // pclose | |
| 30 // execute (now popen2.m) | |
| 31 // sync_system (now merged with system) | |
| 32 // async_system (now merged with system) | |
| 1230 | 33 |
| 9322 | 34 // Extensively revised by John W. Eaton <jwe@octave.org>, |
| 2095 | 35 // April 1996. |
| 1 | 36 |
| 240 | 37 #ifdef HAVE_CONFIG_H |
| 1230 | 38 #include <config.h> |
| 1 | 39 #endif |
| 40 | |
| 4797 | 41 #include <cerrno> |
| 2095 | 42 #include <climits> |
| 4797 | 43 #include <cstdio> |
| 1343 | 44 |
| 3503 | 45 #include <iostream> |
| 7336 | 46 #include <stack> |
| 4726 | 47 #include <vector> |
| 1350 | 48 |
|
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49 #include <fcntl.h> |
| 1230 | 50 #include <sys/types.h> |
| 1 | 51 #include <unistd.h> |
| 1350 | 52 |
| 5325 | 53 #ifdef HAVE_ZLIB_H |
| 54 #include <zlib.h> | |
| 55 #endif | |
| 56 | |
| 5102 | 57 #include "error.h" |
| 2926 | 58 #include "file-ops.h" |
| 6159 | 59 #include "file-stat.h" |
| 5102 | 60 #include "lo-ieee.h" |
| 6159 | 61 #include "oct-env.h" |
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62 #include "oct-locbuf.h" |
| 2926 | 63 |
| 1352 | 64 #include "defun.h" |
| 6108 | 65 #include "file-io.h" |
| 6159 | 66 #include "load-path.h" |
| 2095 | 67 #include "oct-fstrm.h" |
| 68 #include "oct-iostrm.h" | |
| 1377 | 69 #include "oct-map.h" |
| 1750 | 70 #include "oct-obj.h" |
| 2095 | 71 #include "oct-prcstrm.h" |
| 72 #include "oct-stream.h" | |
| 73 #include "oct-strstrm.h" | |
| 1 | 74 #include "pager.h" |
| 444 | 75 #include "sysdep.h" |
| 1352 | 76 #include "utils.h" |
| 2370 | 77 #include "variables.h" |
| 1583 | 78 |
| 2902 | 79 static octave_value stdin_file; |
| 80 static octave_value stdout_file; | |
| 81 static octave_value stderr_file; | |
| 82 | |
| 4468 | 83 static octave_stream stdin_stream; |
| 84 static octave_stream stdout_stream; | |
| 85 static octave_stream stderr_stream; | |
| 86 | |
| 1 | 87 void |
| 164 | 88 initialize_file_io (void) |
| 1 | 89 { |
| 4468 | 90 stdin_stream = octave_istream::create (&std::cin, "stdin"); |
| 2116 | 91 |
| 3531 | 92 // This uses octave_stdout (see pager.h), not std::cout so that Octave's |
| 2116 | 93 // standard output stream will pass through the pager. |
| 94 | |
| 4468 | 95 stdout_stream = octave_ostream::create (&octave_stdout, "stdout"); |
| 2116 | 96 |
| 4468 | 97 stderr_stream = octave_ostream::create (&std::cerr, "stderr"); |
| 1 | 98 |
| 2902 | 99 stdin_file = octave_stream_list::insert (stdin_stream); |
| 100 stdout_file = octave_stream_list::insert (stdout_stream); | |
| 101 stderr_file = octave_stream_list::insert (stderr_stream); | |
| 1 | 102 } |
| 103 | |
| 2095 | 104 void |
| 105 close_files (void) | |
| 1 | 106 { |
| 2095 | 107 octave_stream_list::clear (); |
| 108 } | |
| 636 | 109 |
| 5102 | 110 // List of files to delete when we exit or crash. |
| 111 // | |
| 5775 | 112 // FIXME -- this should really be static, but that causes |
| 5102 | 113 // problems on some systems. |
| 114 std::stack <std::string> tmp_files; | |
| 115 | |
| 116 void | |
| 117 mark_for_deletion (const std::string& file) | |
| 118 { | |
| 119 tmp_files.push (file); | |
| 120 } | |
| 121 | |
| 122 void | |
| 123 cleanup_tmp_files (void) | |
| 124 { | |
| 125 while (! tmp_files.empty ()) | |
| 126 { | |
| 127 std::string filename = tmp_files.top (); | |
| 128 tmp_files.pop (); | |
| 10411 | 129 gnulib::unlink (filename.c_str ()); |
| 5102 | 130 } |
| 131 } | |
| 132 | |
| 4036 | 133 static std::ios::openmode |
| 5325 | 134 fopen_mode_to_ios_mode (const std::string& mode_arg) |
| 1 | 135 { |
| 4036 | 136 std::ios::openmode retval = std::ios::in; |
| 896 | 137 |
| 5325 | 138 if (! mode_arg.empty ()) |
| 368 | 139 { |
| 2095 | 140 // Could probably be faster, but does it really matter? |
| 1766 | 141 |
| 5325 | 142 std::string mode = mode_arg; |
| 143 | |
| 7078 | 144 // 'W' and 'R' are accepted as 'w' and 'r', but we warn about |
| 145 // them because Matlab says they perform "automatic flushing" | |
| 146 // but we don't know precisely what action that implies. | |
| 147 | |
| 148 size_t pos = mode.find ('W'); | |
| 149 | |
| 8021 | 150 if (pos != std::string::npos) |
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151 { |
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152 warning ("fopen: treating mode \"W\" as equivalent to \"w\""); |
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153 mode[pos] = 'w'; |
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154 } |
| 7078 | 155 |
| 156 pos = mode.find ('R'); | |
| 157 | |
| 8021 | 158 if (pos != std::string::npos) |
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159 { |
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160 warning ("fopen: treating mode \"R\" as equivalent to \"r\""); |
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161 mode[pos] = 'r'; |
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162 } |
| 7078 | 163 |
| 164 pos = mode.find ('z'); | |
| 5325 | 165 |
| 8021 | 166 if (pos != std::string::npos) |
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167 { |
| 5325 | 168 #if defined (HAVE_ZLIB) |
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169 mode.erase (pos, 1); |
| 5325 | 170 #else |
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171 error ("this version of Octave does not support gzipped files"); |
| 5325 | 172 #endif |
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173 } |
| 5325 | 174 |
| 175 if (! error_state) | |
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176 { |
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177 if (mode == "rt") |
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178 retval = std::ios::in; |
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179 else if (mode == "wt") |
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180 retval = std::ios::out | std::ios::trunc; |
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181 else if (mode == "at") |
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182 retval = std::ios::out | std::ios::app; |
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183 else if (mode == "r+t" || mode == "rt+") |
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184 retval = std::ios::in | std::ios::out; |
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185 else if (mode == "w+t" || mode == "wt+") |
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186 retval = std::ios::in | std::ios::out | std::ios::trunc; |
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187 else if (mode == "a+t" || mode == "at+") |
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188 retval = std::ios::in | std::ios::out | std::ios::app; |
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189 else if (mode == "rb" || mode == "r") |
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190 retval = std::ios::in | std::ios::binary; |
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191 else if (mode == "wb" || mode == "w") |
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192 retval = std::ios::out | std::ios::trunc | std::ios::binary; |
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193 else if (mode == "ab" || mode == "a") |
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194 retval = std::ios::out | std::ios::app | std::ios::binary; |
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195 else if (mode == "r+b" || mode == "rb+" || mode == "r+") |
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196 retval = std::ios::in | std::ios::out | std::ios::binary; |
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197 else if (mode == "w+b" || mode == "wb+" || mode == "w+") |
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198 retval = (std::ios::in | std::ios::out | std::ios::trunc |
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199 | std::ios::binary); |
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200 else if (mode == "a+b" || mode == "ab+" || mode == "a+") |
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201 retval = (std::ios::in | std::ios::out | std::ios::app |
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202 | std::ios::binary); |
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203 else |
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204 ::error ("invalid mode specified"); |
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205 } |
| 1 | 206 } |
| 207 | |
| 208 return retval; | |
| 209 } | |
| 210 | |
| 1957 | 211 DEFUN (fclose, args, , |
| 3372 | 212 "-*- texinfo -*-\n\ |
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213 @deftypefn {Built-in Function} {} fclose (@var{fid})\n\ |
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214 @deftypefnx {Built-in Function} {} fclose (\"all\")\n\ |
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215 Close the specified file. If successful, @code{fclose} returns 0,\n\ |
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216 otherwise, it returns -1. The second form of the @code{fclose} call closes\n\ |
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217 all open files except @code{stdout}, @code{stderr}, and @code{stdin}.\n\ |
| 5642 | 218 @seealso{fopen, fseek, ftell}\n\ |
| 219 @end deftypefn") | |
| 529 | 220 { |
| 4233 | 221 octave_value retval = -1; |
| 529 | 222 |
| 223 int nargin = args.length (); | |
| 224 | |
| 2095 | 225 if (nargin == 1) |
| 4233 | 226 retval = octave_stream_list::remove (args(0), "fclose"); |
| 1 | 227 else |
| 5823 | 228 print_usage (); |
| 1 | 229 |
| 230 return retval; | |
| 231 } | |
| 232 | |
| 5144 | 233 DEFUN (fclear, args, , |
| 234 "-*- texinfo -*-\n\ | |
| 235 @deftypefn {Built-in Function} {} fclear (@var{fid})\n\ | |
| 236 Clear the stream state for the specified file.\n\ | |
| 237 @end deftypefn") | |
| 238 { | |
| 239 octave_value retval; | |
| 240 | |
| 241 int nargin = args.length (); | |
| 242 | |
| 243 if (nargin == 1) | |
| 244 { | |
| 245 int fid = octave_stream_list::get_file_number (args (0)); | |
| 246 | |
| 247 octave_stream os = octave_stream_list::lookup (fid, "fclear"); | |
| 248 | |
| 249 if (! error_state) | |
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250 os.clearerr (); |
| 5144 | 251 } |
| 252 else | |
| 5823 | 253 print_usage (); |
| 5144 | 254 |
| 255 return retval; | |
| 256 } | |
| 257 | |
| 1957 | 258 DEFUN (fflush, args, , |
| 3372 | 259 "-*- texinfo -*-\n\ |
| 260 @deftypefn {Built-in Function} {} fflush (@var{fid})\n\ | |
| 261 Flush output to @var{fid}. This is useful for ensuring that all\n\ | |
| 262 pending output makes it to the screen before some other event occurs.\n\ | |
| 263 For example, it is always a good idea to flush the standard output\n\ | |
| 264 stream before calling @code{input}.\n\ | |
| 5095 | 265 \n\ |
| 266 @code{fflush} returns 0 on success and an OS dependent error value\n\ | |
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267 (@minus{}1 on Unix) on error.\n\ |
| 5642 | 268 @seealso{fopen, fclose}\n\ |
| 269 @end deftypefn") | |
| 1181 | 270 { |
| 4233 | 271 octave_value retval = -1; |
| 1181 | 272 |
| 273 int nargin = args.length (); | |
| 274 | |
| 2095 | 275 if (nargin == 1) |
| 276 { | |
| 5775 | 277 // FIXME -- any way to avoid special case for stdout? |
| 2609 | 278 |
| 279 int fid = octave_stream_list::get_file_number (args (0)); | |
| 280 | |
| 281 if (fid == 1) | |
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282 { |
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283 flush_octave_stdout (); |
| 2095 | 284 |
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285 retval = 0; |
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286 } |
| 2095 | 287 else |
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288 { |
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289 octave_stream os = octave_stream_list::lookup (fid, "fflush"); |
| 2609 | 290 |
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291 if (! error_state) |
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292 retval = os.flush (); |
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293 } |
| 2095 | 294 } |
| 295 else | |
| 5823 | 296 print_usage (); |
| 1181 | 297 |
| 298 return retval; | |
| 299 } | |
| 300 | |
| 2095 | 301 DEFUN (fgetl, args, , |
| 3372 | 302 "-*- texinfo -*-\n\ |
| 303 @deftypefn {Built-in Function} {} fgetl (@var{fid}, @var{len})\n\ | |
| 304 Read characters from a file, stopping after a newline, or EOF,\n\ | |
| 305 or @var{len} characters have been read. The characters read, excluding\n\ | |
| 306 the possible trailing newline, are returned as a string.\n\ | |
| 1339 | 307 \n\ |
| 3372 | 308 If @var{len} is omitted, @code{fgetl} reads until the next newline\n\ |
| 309 character.\n\ | |
| 310 \n\ | |
| 311 If there are no more characters to read, @code{fgetl} returns @minus{}1.\n\ | |
| 5642 | 312 @seealso{fread, fscanf}\n\ |
| 313 @end deftypefn") | |
| 1339 | 314 { |
| 4468 | 315 static std::string who = "fgetl"; |
| 316 | |
| 2599 | 317 octave_value_list retval; |
| 318 | |
| 4233 | 319 retval(1) = 0; |
| 320 retval(0) = -1; | |
| 1339 | 321 |
| 322 int nargin = args.length (); | |
| 323 | |
| 324 if (nargin == 1 || nargin == 2) | |
| 2095 | 325 { |
| 4468 | 326 octave_stream os = octave_stream_list::lookup (args(0), who); |
| 2095 | 327 |
| 3341 | 328 if (! error_state) |
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329 { |
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330 octave_value len_arg = (nargin == 2) ? args(1) : octave_value (); |
| 2095 | 331 |
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332 bool err = false; |
| 2095 | 333 |
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334 std::string tmp = os.getl (len_arg, err, who); |
| 2095 | 335 |
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336 if (! (error_state || err)) |
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337 { |
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338 retval(1) = tmp.length (); |
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339 retval(0) = tmp; |
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340 } |
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341 } |
| 2095 | 342 } |
| 1339 | 343 else |
| 5823 | 344 print_usage (); |
| 1339 | 345 |
| 346 return retval; | |
| 347 } | |
| 348 | |
| 2095 | 349 DEFUN (fgets, args, , |
| 3372 | 350 "-*- texinfo -*-\n\ |
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351 @deftypefn {Built-in Function} {} fgets (@var{fid})\n\ |
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352 @deftypefnx {Built-in Function} {} fgets (@var{fid}, @var{len})\n\ |
| 3372 | 353 Read characters from a file, stopping after a newline, or EOF,\n\ |
| 354 or @var{len} characters have been read. The characters read, including\n\ | |
| 355 the possible trailing newline, are returned as a string.\n\ | |
| 529 | 356 \n\ |
| 3372 | 357 If @var{len} is omitted, @code{fgets} reads until the next newline\n\ |
| 358 character.\n\ | |
| 359 \n\ | |
| 360 If there are no more characters to read, @code{fgets} returns @minus{}1.\n\ | |
| 7781 | 361 @seealso{fputs, fopen, fread, fscanf}\n\ |
| 5642 | 362 @end deftypefn") |
| 529 | 363 { |
| 4468 | 364 static std::string who = "fgets"; |
| 365 | |
| 2599 | 366 octave_value_list retval; |
| 367 | |
| 368 retval(1) = 0.0; | |
| 369 retval(0) = -1.0; | |
| 529 | 370 |
| 371 int nargin = args.length (); | |
| 372 | |
| 1338 | 373 if (nargin == 1 || nargin == 2) |
| 2095 | 374 { |
| 4468 | 375 octave_stream os = octave_stream_list::lookup (args(0), who); |
| 2095 | 376 |
| 3341 | 377 if (! error_state) |
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378 { |
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379 octave_value len_arg = (nargin == 2) ? args(1) : octave_value (); |
| 2095 | 380 |
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381 bool err = false; |
| 2095 | 382 |
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383 std::string tmp = os.gets (len_arg, err, who); |
| 2095 | 384 |
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385 if (! (error_state || err)) |
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386 { |
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387 retval(1) = tmp.length (); |
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388 retval(0) = tmp; |
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389 } |
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390 } |
| 2095 | 391 } |
| 1338 | 392 else |
| 5823 | 393 print_usage (); |
| 529 | 394 |
| 395 return retval; | |
| 396 } | |
| 397 | |
| 9701 | 398 DEFUN (fskipl, args, , |
| 399 "-*- texinfo -*-\n\ | |
| 400 @deftypefn {Built-in Function} {} fskipl (@var{fid}, @var{count})\n\ | |
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401 Skip a given number of lines, i.e., discards characters until an end-of-line\n\ |
| 9701 | 402 is met exactly @var{count}-times, or end-of-file occurs.\n\ |
| 403 Returns the number of lines skipped (end-of-line sequences encountered).\n\ | |
| 404 If @var{count} is omitted, it defaults to 1. @var{count} may also be\n\ | |
| 405 @code{Inf}, in which case lines are skipped to the end of file.\n\ | |
| 406 This form is suitable for counting lines in a file.\n\ | |
| 407 @seealso{fgetl, fgets}\n\ | |
| 408 @end deftypefn") | |
| 409 { | |
| 410 static std::string who = "fskipl"; | |
| 411 | |
| 412 octave_value retval; | |
| 413 | |
| 414 int nargin = args.length (); | |
| 415 | |
| 416 if (nargin == 1 || nargin == 2) | |
| 417 { | |
| 418 octave_stream os = octave_stream_list::lookup (args(0), who); | |
| 419 | |
| 420 if (! error_state) | |
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421 { |
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422 octave_value count_arg = (nargin == 2) ? args(1) : octave_value (); |
| 9701 | 423 |
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424 bool err = false; |
| 9701 | 425 |
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426 long tmp = os.skipl (count_arg, err, who); |
| 9701 | 427 |
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428 if (! (error_state || err)) |
| 9701 | 429 retval = tmp; |
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430 } |
| 9701 | 431 } |
| 432 else | |
| 433 print_usage (); | |
| 434 | |
| 435 return retval; | |
| 436 } | |
| 437 | |
| 438 | |
| 3340 | 439 static octave_stream |
| 3523 | 440 do_stream_open (const std::string& name, const std::string& mode, |
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441 const std::string& arch, int& fid) |
| 1 | 442 { |
| 3340 | 443 octave_stream retval; |
| 1 | 444 |
| 2095 | 445 fid = -1; |
| 1 | 446 |
| 4036 | 447 std::ios::openmode md = fopen_mode_to_ios_mode (mode); |
| 1 | 448 |
| 2095 | 449 if (! error_state) |
| 450 { | |
| 2318 | 451 oct_mach_info::float_format flt_fmt = |
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452 oct_mach_info::string_to_float_format (arch); |
| 1 | 453 |
| 4798 | 454 if (! error_state) |
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455 { |
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456 std::string fname = file_ops::tilde_expand (name); |
| 6159 | 457 |
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458 file_stat fs (fname); |
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459 |
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460 if (! (md & std::ios::out |
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461 || octave_env::absolute_pathname (fname) |
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462 || octave_env::rooted_relative_pathname (fname))) |
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463 { |
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464 if (! fs.exists ()) |
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465 { |
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466 std::string tmp |
| 10250 | 467 = octave_env::make_absolute (load_path::find_file (fname)); |
| 6159 | 468 |
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469 if (! tmp.empty ()) |
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470 { |
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471 warning_with_id ("Octave:fopen-file-in-path", |
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472 "fopen: file found in load path"); |
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473 fname = tmp; |
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474 } |
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475 } |
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476 } |
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477 |
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478 if (! fs.is_dir ()) |
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479 { |
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480 std::string tmode = mode; |
| 6405 | 481 |
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482 // Use binary mode if 't' is not specified, but don't add |
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483 // 'b' if it is already present. |
| 6405 | 484 |
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485 size_t bpos = tmode.find ('b'); |
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486 size_t tpos = tmode.find ('t'); |
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487 |
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488 if (bpos == std::string::npos && tpos == std::string::npos) |
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489 tmode += 'b'; |
| 6405 | 490 |
| 6905 | 491 #if defined (HAVE_ZLIB) |
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492 size_t pos = tmode.find ('z'); |
| 4798 | 493 |
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494 if (pos != std::string::npos) |
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495 { |
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496 tmode.erase (pos, 1); |
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497 |
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498 FILE *fptr = gnulib::fopen (fname.c_str (), tmode.c_str ()); |
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499 |
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500 int fd = fileno (fptr); |
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501 |
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502 gzFile gzf = ::gzdopen (fd, tmode.c_str ()); |
| 5325 | 503 |
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504 if (fptr) |
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505 retval = octave_zstdiostream::create (fname, gzf, fd, |
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506 md, flt_fmt); |
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507 else |
| 10411 | 508 retval.error (gnulib::strerror (errno)); |
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509 } |
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510 else |
| 5325 | 511 #endif |
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512 { |
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513 FILE *fptr = gnulib::fopen (fname.c_str (), tmode.c_str ()); |
| 5325 | 514 |
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515 retval = octave_stdiostream::create (fname, fptr, md, flt_fmt); |
| 5370 | 516 |
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517 if (! fptr) |
| 10411 | 518 retval.error (gnulib::strerror (errno)); |
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519 } |
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520 |
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521 } |
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522 } |
| 1 | 523 } |
| 524 | |
| 2095 | 525 return retval; |
| 526 } | |
| 1 | 527 |
| 3340 | 528 static octave_stream |
| 2095 | 529 do_stream_open (const octave_value& tc_name, const octave_value& tc_mode, |
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530 const octave_value& tc_arch, const char *fcn, int& fid) |
| 2095 | 531 { |
| 3340 | 532 octave_stream retval; |
| 2095 | 533 |
| 534 fid = -1; | |
| 535 | |
| 3523 | 536 std::string name = tc_name.string_value (); |
| 2095 | 537 |
| 538 if (! error_state) | |
| 1 | 539 { |
| 3523 | 540 std::string mode = tc_mode.string_value (); |
| 2095 | 541 |
| 542 if (! error_state) | |
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543 { |
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544 std::string arch = tc_arch.string_value (); |
| 1 | 545 |
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546 if (! error_state) |
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547 retval = do_stream_open (name, mode, arch, fid); |
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548 else |
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549 ::error ("%s: architecture type must be a string", fcn); |
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550 } |
| 2095 | 551 else |
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552 ::error ("%s: file mode must be a string", fcn); |
| 1 | 553 } |
| 2095 | 554 else |
| 555 ::error ("%s: file name must be a string", fcn); | |
| 1 | 556 |
| 557 return retval; | |
| 558 } | |
| 559 | |
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560 DEFUN (fopen, args, nargout, |
| 3372 | 561 "-*- texinfo -*-\n\ |
| 10840 | 562 @deftypefn {Built-in Function} {[@var{fid}, @var{msg}] =} fopen (@var{name}, @var{mode}, @var{arch})\n\ |
| 3372 | 563 @deftypefnx {Built-in Function} {@var{fid_list} =} fopen (\"all\")\n\ |
| 5353 | 564 @deftypefnx {Built-in Function} {[@var{file}, @var{mode}, @var{arch}] =} fopen (@var{fid})\n\ |
| 3372 | 565 The first form of the @code{fopen} function opens the named file with\n\ |
| 566 the specified mode (read-write, read-only, etc.) and architecture\n\ | |
| 567 interpretation (IEEE big endian, IEEE little endian, etc.), and returns\n\ | |
| 568 an integer value that may be used to refer to the file later. If an\n\ | |
| 569 error occurs, @var{fid} is set to @minus{}1 and @var{msg} contains the\n\ | |
| 570 corresponding system error message. The @var{mode} is a one or two\n\ | |
| 571 character string that specifies whether the file is to be opened for\n\ | |
| 572 reading, writing, or both.\n\ | |
| 1181 | 573 \n\ |
| 3372 | 574 The second form of the @code{fopen} function returns a vector of file ids\n\ |
| 575 corresponding to all the currently open files, excluding the\n\ | |
| 576 @code{stdin}, @code{stdout}, and @code{stderr} streams.\n\ | |
| 2318 | 577 \n\ |
| 5353 | 578 The third form of the @code{fopen} function returns information about the\n\ |
| 579 open file given its file id.\n\ | |
| 1181 | 580 \n\ |
| 3372 | 581 For example,\n\ |
| 582 \n\ | |
| 583 @example\n\ | |
| 584 myfile = fopen (\"splat.dat\", \"r\", \"ieee-le\");\n\ | |
| 585 @end example\n\ | |
| 2095 | 586 \n\ |
| 3372 | 587 @noindent\n\ |
| 588 opens the file @file{splat.dat} for reading. If necessary, binary\n\ | |
| 589 numeric values will be read assuming they are stored in IEEE format with\n\ | |
| 590 the least significant bit first, and then converted to the native\n\ | |
| 591 representation.\n\ | |
| 2318 | 592 \n\ |
| 3372 | 593 Opening a file that is already open simply opens it again and returns a\n\ |
| 594 separate file id. It is not an error to open a file several times,\n\ | |
| 595 though writing to the same file through several different file ids may\n\ | |
| 596 produce unexpected results.\n\ | |
| 597 \n\ | |
| 598 The possible values @samp{mode} may have are\n\ | |
| 599 \n\ | |
| 600 @table @asis\n\ | |
| 601 @item @samp{r}\n\ | |
| 602 Open a file for reading.\n\ | |
| 3263 | 603 \n\ |
| 3372 | 604 @item @samp{w}\n\ |
| 7001 | 605 Open a file for writing. The previous contents are discarded.\n\ |
| 3372 | 606 \n\ |
| 607 @item @samp{a}\n\ | |
| 608 Open or create a file for writing at the end of the file.\n\ | |
| 609 \n\ | |
| 610 @item @samp{r+}\n\ | |
| 611 Open an existing file for reading and writing.\n\ | |
| 612 \n\ | |
| 613 @item @samp{w+}\n\ | |
| 614 Open a file for reading or writing. The previous contents are\n\ | |
| 615 discarded.\n\ | |
| 616 \n\ | |
| 617 @item @samp{a+}\n\ | |
| 618 Open or create a file for reading or writing at the end of the\n\ | |
| 619 file.\n\ | |
| 620 @end table\n\ | |
| 621 \n\ | |
| 4865 | 622 Append a \"t\" to the mode string to open the file in text mode or a\n\ |
| 623 \"b\" to open in binary mode. On Windows and Macintosh systems, text\n\ | |
| 624 mode reading and writing automatically converts linefeeds to the\n\ | |
| 625 appropriate line end character for the system (carriage-return linefeed\n\ | |
| 6665 | 626 on Windows, carriage-return on Macintosh). The default if no mode is\n\ |
| 4865 | 627 specified is binary mode.\n\ |
| 628 \n\ | |
| 5325 | 629 Additionally, you may append a \"z\" to the mode string to open a\n\ |
| 630 gzipped file for reading or writing. For this to be successful, you\n\ | |
| 631 must also open the file in binary mode.\n\ | |
| 632 \n\ | |
| 3372 | 633 The parameter @var{arch} is a string specifying the default data format\n\ |
| 634 for the file. Valid values for @var{arch} are:\n\ | |
| 2318 | 635 \n\ |
| 3372 | 636 @table @asis\n\ |
| 637 @samp{native}\n\ | |
| 638 The format of the current machine (this is the default).\n\ | |
| 639 \n\ | |
| 4082 | 640 @samp{ieee-be}\n\ |
| 3372 | 641 IEEE big endian format.\n\ |
| 642 \n\ | |
| 4082 | 643 @samp{ieee-le}\n\ |
| 3372 | 644 IEEE little endian format.\n\ |
| 2318 | 645 \n\ |
| 3372 | 646 @samp{vaxd}\n\ |
| 647 VAX D floating format.\n\ | |
| 2318 | 648 \n\ |
| 3372 | 649 @samp{vaxg}\n\ |
| 650 VAX G floating format.\n\ | |
| 2318 | 651 \n\ |
| 3372 | 652 @samp{cray}\n\ |
| 653 Cray floating format.\n\ | |
| 654 @end table\n\ | |
| 655 \n\ | |
| 656 @noindent\n\ | |
| 657 however, conversions are currently only supported for @samp{native}\n\ | |
| 658 @samp{ieee-be}, and @samp{ieee-le} formats.\n\ | |
| 7781 | 659 @seealso{fclose, fgets, fputs, fread, fseek, ferror, fprintf, fscanf, ftell, fwrite}\n\ |
| 5642 | 660 @end deftypefn") |
| 529 | 661 { |
| 2599 | 662 octave_value_list retval; |
| 663 | |
| 664 retval(0) = -1.0; | |
| 529 | 665 |
| 666 int nargin = args.length (); | |
| 667 | |
| 2095 | 668 if (nargin == 1) |
| 669 { | |
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670 if (args(0).is_string ()) |
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671 { |
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672 // If there is only one argument and it is a string but it |
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673 // is not the string "all", we assume it is a file to open |
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674 // with MODE = "r". To open a file called "all", you have |
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675 // to supply more than one argument. |
| 3263 | 676 |
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677 if (nargout < 2 && args(0).string_value () == "all") |
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678 return octave_stream_list::open_file_numbers (); |
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679 } |
| 2095 | 680 else |
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681 { |
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682 string_vector tmp = octave_stream_list::get_info (args(0)); |
| 529 | 683 |
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684 if (! error_state) |
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685 { |
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686 retval(2) = tmp(2); |
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687 retval(1) = tmp(1); |
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688 retval(0) = tmp(0); |
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689 } |
| 3263 | 690 |
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691 return retval; |
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692 } |
| 1 | 693 } |
| 694 | |
| 2095 | 695 if (nargin > 0 && nargin < 4) |
| 696 { | |
| 697 octave_value mode = (nargin == 2 || nargin == 3) | |
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698 ? args(1) : octave_value ("r"); |
| 2095 | 699 |
| 700 octave_value arch = (nargin == 3) | |
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701 ? args(2) : octave_value ("native"); |
| 2095 | 702 |
| 703 int fid = -1; | |
| 704 | |
| 3340 | 705 octave_stream os = do_stream_open (args(0), mode, arch, "fopen", fid); |
| 2095 | 706 |
| 5370 | 707 if (os && ! error_state) |
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708 { |
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709 retval(1) = ""; |
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710 retval(0) = octave_stream_list::insert (os); |
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711 } |
| 2095 | 712 else |
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713 { |
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714 int error_number = 0; |
| 5370 | 715 |
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716 retval(1) = os.error (false, error_number); |
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717 retval(0) = -1.0; |
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718 } |
| 2095 | 719 } |
| 720 else | |
| 5823 | 721 print_usage (); |
| 1 | 722 |
| 723 return retval; | |
| 724 } | |
| 725 | |
| 1957 | 726 DEFUN (freport, args, , |
| 3372 | 727 "-*- texinfo -*-\n\ |
| 728 @deftypefn {Built-in Function} {} freport ()\n\ | |
| 729 Print a list of which files have been opened, and whether they are open\n\ | |
| 10840 | 730 for reading, writing, or both. For example:\n\ |
| 3372 | 731 \n\ |
| 732 @example\n\ | |
| 733 @group\n\ | |
| 734 freport ()\n\ | |
| 735 \n\ | |
| 736 @print{} number mode name\n\ | |
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737 @print{}\n\ |
| 3372 | 738 @print{} 0 r stdin\n\ |
| 739 @print{} 1 w stdout\n\ | |
| 740 @print{} 2 w stderr\n\ | |
| 741 @print{} 3 r myfile\n\ | |
| 742 @end group\n\ | |
| 743 @end example\n\ | |
| 744 @end deftypefn") | |
| 1181 | 745 { |
| 2095 | 746 octave_value_list retval; |
| 1181 | 747 |
| 748 int nargin = args.length (); | |
| 749 | |
| 750 if (nargin > 0) | |
| 751 warning ("freport: ignoring extra arguments"); | |
| 752 | |
| 2095 | 753 octave_stdout << octave_stream_list::list_open_files (); |
| 1181 | 754 |
| 755 return retval; | |
| 756 } | |
| 757 | |
| 4715 | 758 DEFUN (frewind, args, nargout, |
| 3372 | 759 "-*- texinfo -*-\n\ |
| 760 @deftypefn {Built-in Function} {} frewind (@var{fid})\n\ | |
| 761 Move the file pointer to the beginning of the file @var{fid}, returning\n\ | |
| 4715 | 762 0 for success, and -1 if an error was encountered. It is equivalent to\n\ |
| 3372 | 763 @code{fseek (@var{fid}, 0, SEEK_SET)}.\n\ |
| 764 @end deftypefn") | |
| 529 | 765 { |
| 4715 | 766 octave_value retval; |
| 767 | |
| 768 int result = -1; | |
| 1 | 769 |
| 506 | 770 int nargin = args.length (); |
| 771 | |
| 2095 | 772 if (nargin == 1) |
| 1086 | 773 { |
| 3341 | 774 octave_stream os = octave_stream_list::lookup (args(0), "frewind"); |
| 636 | 775 |
| 3341 | 776 if (! error_state) |
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777 result = os.rewind (); |
| 1 | 778 } |
| 779 else | |
| 5823 | 780 print_usage (); |
| 1 | 781 |
| 4715 | 782 if (nargout > 0) |
| 783 retval = result; | |
| 784 | |
| 1 | 785 return retval; |
| 786 } | |
| 787 | |
| 1957 | 788 DEFUN (fseek, args, , |
| 3372 | 789 "-*- texinfo -*-\n\ |
| 790 @deftypefn {Built-in Function} {} fseek (@var{fid}, @var{offset}, @var{origin})\n\ | |
| 5095 | 791 Set the file pointer to any location within the file @var{fid}.\n\ |
| 792 \n\ | |
| 793 The pointer is positioned @var{offset} characters from the @var{origin},\n\ | |
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794 which may be one of the predefined variables @w{@code{SEEK_CUR}} (current\n\ |
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795 position), @w{@code{SEEK_SET}} (beginning), or @w{@code{SEEK_END}} (end of\n\ |
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796 file) or strings \"cof\", \"bof\" or \"eof\". If @var{origin} is omitted,\n\ |
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797 @w{@code{SEEK_SET}} is assumed. The offset must be zero, or a value returned\n\ |
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798 by @code{ftell} (in which case @var{origin} must be @w{@code{SEEK_SET}}).\n\ |
| 5095 | 799 \n\ |
| 800 Return 0 on success and -1 on error.\n\ | |
| 5642 | 801 @seealso{ftell, fopen, fclose}\n\ |
| 802 @end deftypefn") | |
| 529 | 803 { |
| 4233 | 804 octave_value retval = -1; |
| 529 | 805 |
| 806 int nargin = args.length (); | |
| 807 | |
| 2095 | 808 if (nargin == 2 || nargin == 3) |
| 809 { | |
| 3341 | 810 octave_stream os = octave_stream_list::lookup (args(0), "fseek"); |
| 1181 | 811 |
| 3341 | 812 if (! error_state) |
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813 { |
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814 octave_value origin_arg = (nargin == 3) |
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815 ? args(2) : octave_value (-1.0); |
| 1 | 816 |
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817 retval = os.seek (args(1), origin_arg); |
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818 } |
| 368 | 819 } |
| 2095 | 820 else |
| 5823 | 821 print_usage (); |
| 1 | 822 |
| 823 return retval; | |
| 824 } | |
| 825 | |
| 1957 | 826 DEFUN (ftell, args, , |
| 3372 | 827 "-*- texinfo -*-\n\ |
| 828 @deftypefn {Built-in Function} {} ftell (@var{fid})\n\ | |
| 829 Return the position of the file pointer as the number of characters\n\ | |
| 830 from the beginning of the file @var{fid}.\n\ | |
| 5642 | 831 @seealso{fseek, fopen, fclose}\n\ |
| 832 @end deftypefn") | |
| 1181 | 833 { |
| 4797 | 834 octave_value retval = -1; |
| 1 | 835 |
| 506 | 836 int nargin = args.length (); |
| 837 | |
| 2095 | 838 if (nargin == 1) |
| 1 | 839 { |
| 3341 | 840 octave_stream os = octave_stream_list::lookup (args(0), "ftell"); |
| 1 | 841 |
| 3341 | 842 if (! error_state) |
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843 retval = os.tell (); |
| 1 | 844 } |
| 845 else | |
| 5823 | 846 print_usage (); |
| 1 | 847 |
| 848 return retval; | |
| 849 } | |
| 850 | |
| 3737 | 851 DEFUN (fprintf, args, nargout, |
| 3372 | 852 "-*- texinfo -*-\n\ |
| 853 @deftypefn {Built-in Function} {} fprintf (@var{fid}, @var{template}, @dots{})\n\ | |
| 854 This function is just like @code{printf}, except that the output is\n\ | |
| 855 written to the stream @var{fid} instead of @code{stdout}.\n\ | |
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856 If @var{fid} is omitted, the output is written to @code{stdout}.\n\ |
| 5642 | 857 @seealso{printf, sprintf, fread, fscanf, fopen, fclose}\n\ |
| 858 @end deftypefn") | |
| 1181 | 859 { |
| 4468 | 860 static std::string who = "fprintf"; |
| 861 | |
| 4715 | 862 octave_value retval; |
| 863 | |
| 864 int result = -1; | |
| 4468 | 865 |
| 1181 | 866 int nargin = args.length (); |
| 867 | |
| 2875 | 868 if (nargin > 1 || (nargin > 0 && args(0).is_string ())) |
| 2095 | 869 { |
| 3340 | 870 octave_stream os; |
| 2873 | 871 int fmt_n = 0; |
| 872 | |
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873 if (args(0).is_string ()) |
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874 { |
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875 os = octave_stream_list::lookup (1, who); |
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876 } |
| 2873 | 877 else |
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878 { |
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879 fmt_n = 1; |
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880 os = octave_stream_list::lookup (args(0), who); |
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881 } |
| 2095 | 882 |
| 3341 | 883 if (! error_state) |
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884 { |
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885 if (args(fmt_n).is_string ()) |
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886 { |
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887 octave_value_list tmp_args; |
| 2095 | 888 |
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889 if (nargin > 1 + fmt_n) |
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890 { |
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891 tmp_args.resize (nargin-fmt_n-1, octave_value ()); |
| 2095 | 892 |
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893 for (int i = fmt_n + 1; i < nargin; i++) |
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894 tmp_args(i-fmt_n-1) = args(i); |
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895 } |
| 2095 | 896 |
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897 result = os.printf (args(fmt_n), tmp_args, who); |
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898 } |
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899 else |
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900 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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901 } |
| 2095 | 902 } |
| 903 else | |
| 5823 | 904 print_usage (); |
| 1181 | 905 |
| 4715 | 906 if (nargout > 0) |
| 907 retval = result; | |
| 908 | |
| 909 return retval; | |
| 1181 | 910 } |
| 911 | |
| 4715 | 912 DEFUN (printf, args, nargout, |
| 4468 | 913 "-*- texinfo -*-\n\ |
| 5095 | 914 @deftypefn {Built-in Function} {} printf (@var{template}, @dots{})\n\ |
| 4468 | 915 Print optional arguments under the control of the template string\n\ |
| 5653 | 916 @var{template} to the stream @code{stdout} and return the number of\n\ |
| 917 characters printed.\n\ | |
| 918 @ifclear OCTAVE_MANUAL\n\ | |
| 5095 | 919 \n\ |
| 5653 | 920 See the Formatted Output section of the GNU Octave manual for a\n\ |
| 921 complete description of the syntax of the template string.\n\ | |
| 922 @end ifclear\n\ | |
| 5642 | 923 @seealso{fprintf, sprintf, scanf}\n\ |
| 924 @end deftypefn") | |
| 4468 | 925 { |
| 926 static std::string who = "printf"; | |
| 927 | |
| 4715 | 928 octave_value retval; |
| 929 | |
| 930 int result = -1; | |
| 4468 | 931 |
| 932 int nargin = args.length (); | |
| 933 | |
| 934 if (nargin > 0) | |
| 935 { | |
| 936 if (args(0).is_string ()) | |
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937 { |
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938 octave_value_list tmp_args; |
| 4468 | 939 |
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940 if (nargin > 1) |
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941 { |
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942 tmp_args.resize (nargin-1, octave_value ()); |
| 4468 | 943 |
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944 for (int i = 1; i < nargin; i++) |
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945 tmp_args(i-1) = args(i); |
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946 } |
| 4468 | 947 |
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948 result = stdout_stream.printf (args(0), tmp_args, who); |
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949 } |
| 4468 | 950 else |
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951 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
| 4468 | 952 } |
| 953 else | |
| 5823 | 954 print_usage (); |
| 4468 | 955 |
| 4715 | 956 if (nargout > 0) |
| 957 retval = result; | |
| 958 | |
| 4468 | 959 return retval; |
| 960 } | |
| 961 | |
| 2095 | 962 DEFUN (fputs, args, , |
| 3372 | 963 "-*- texinfo -*-\n\ |
| 964 @deftypefn {Built-in Function} {} fputs (@var{fid}, @var{string})\n\ | |
| 965 Write a string to a file with no formatting.\n\ | |
| 5095 | 966 \n\ |
| 967 Return a non-negative number on success and EOF on error.\n\ | |
| 7781 | 968 @seealso{scanf, sscanf, fread, fprintf, fgets, fscanf}\n\ |
| 3372 | 969 @end deftypefn") |
| 1181 | 970 { |
| 4468 | 971 static std::string who = "fputs"; |
| 972 | |
| 4233 | 973 octave_value retval = -1; |
| 1181 | 974 |
| 975 int nargin = args.length (); | |
| 976 | |
| 2095 | 977 if (nargin == 2) |
| 978 { | |
| 4468 | 979 octave_stream os = octave_stream_list::lookup (args(0), who); |
| 1181 | 980 |
| 3341 | 981 if (! error_state) |
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982 retval = os.puts (args(1), who); |
| 2095 | 983 } |
| 1181 | 984 else |
| 5823 | 985 print_usage (); |
| 4468 | 986 |
| 987 return retval; | |
| 988 } | |
| 989 | |
| 990 DEFUN (puts, args, , | |
| 991 "-*- texinfo -*-\n\ | |
| 992 @deftypefn {Built-in Function} {} puts (@var{string})\n\ | |
| 993 Write a string to the standard output with no formatting.\n\ | |
| 5095 | 994 \n\ |
| 995 Return a non-negative number on success and EOF on error.\n\ | |
| 4468 | 996 @end deftypefn") |
| 997 { | |
| 998 static std::string who = "puts"; | |
| 999 | |
| 1000 octave_value retval = -1; | |
| 1001 | |
| 1002 if (args.length () == 1) | |
| 1003 retval = stdout_stream.puts (args(0), who); | |
| 1004 else | |
| 5823 | 1005 print_usage (); |
| 1181 | 1006 |
| 1007 return retval; | |
| 1008 } | |
| 1009 | |
| 2095 | 1010 DEFUN (sprintf, args, , |
| 3372 | 1011 "-*- texinfo -*-\n\ |
| 1012 @deftypefn {Built-in Function} {} sprintf (@var{template}, @dots{})\n\ | |
| 1013 This is like @code{printf}, except that the output is returned as a\n\ | |
| 1014 string. Unlike the C library function, which requires you to provide a\n\ | |
| 1015 suitably sized string as an argument, Octave's @code{sprintf} function\n\ | |
| 1016 returns the string, automatically sized to hold all of the items\n\ | |
| 1017 converted.\n\ | |
| 5642 | 1018 @seealso{printf, fprintf, sscanf}\n\ |
| 1019 @end deftypefn") | |
| 1 | 1020 { |
| 4468 | 1021 static std::string who = "sprintf"; |
| 1022 | |
| 2095 | 1023 octave_value_list retval; |
| 1 | 1024 |
| 2095 | 1025 int nargin = args.length (); |
| 1 | 1026 |
| 2095 | 1027 if (nargin > 0) |
| 1 | 1028 { |
| 2116 | 1029 retval(2) = -1.0; |
| 1030 retval(1) = "unknown error"; | |
| 1031 retval(0) = ""; | |
| 1032 | |
| 3340 | 1033 octave_ostrstream *ostr = new octave_ostrstream (); |
| 1 | 1034 |
| 3340 | 1035 octave_stream os (ostr); |
| 628 | 1036 |
| 3340 | 1037 if (os.is_valid ()) |
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1038 { |
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1039 octave_value fmt_arg = args(0); |
| 6007 | 1040 |
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1041 if (fmt_arg.is_string ()) |
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1042 { |
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1043 octave_value_list tmp_args; |
| 1 | 1044 |
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1045 if (nargin > 1) |
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1046 { |
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1047 tmp_args.resize (nargin-1, octave_value ()); |
| 1 | 1048 |
|
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1049 for (int i = 1; i < nargin; i++) |
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1050 tmp_args(i-1) = args(i); |
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1051 } |
| 628 | 1052 |
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1053 retval(2) = os.printf (fmt_arg, tmp_args, who); |
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1054 retval(1) = os.error (); |
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1055 retval(0) = octave_value (ostr->str (), |
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1056 fmt_arg.is_sq_string () ? '\'' : '"'); |
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1057 } |
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1058 else |
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1059 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1060 } |
| 2095 | 1061 else |
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1062 ::error ("%s: unable to create output buffer", who.c_str ()); |
| 1 | 1063 } |
| 1064 else | |
| 5823 | 1065 print_usage (); |
| 1 | 1066 |
| 1067 return retval; | |
| 1068 } | |
| 1069 | |
| 2095 | 1070 DEFUN (fscanf, args, , |
| 3372 | 1071 "-*- texinfo -*-\n\ |
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1072 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}] =} fscanf (@var{fid}, @var{template}, @var{size})\n\ |
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1073 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}] =} fscanf (@var{fid}, @var{template}, \"C\")\n\ |
| 3372 | 1074 In the first form, read from @var{fid} according to @var{template},\n\ |
| 1075 returning the result in the matrix @var{val}.\n\ | |
| 2122 | 1076 \n\ |
| 3372 | 1077 The optional argument @var{size} specifies the amount of data to read\n\ |
| 1078 and may be one of\n\ | |
| 1079 \n\ | |
| 1080 @table @code\n\ | |
| 1081 @item Inf\n\ | |
| 1082 Read as much as possible, returning a column vector.\n\ | |
| 1083 \n\ | |
| 1084 @item @var{nr}\n\ | |
| 1085 Read up to @var{nr} elements, returning a column vector.\n\ | |
| 2122 | 1086 \n\ |
| 3372 | 1087 @item [@var{nr}, Inf]\n\ |
| 1088 Read as much as possible, returning a matrix with @var{nr} rows. If the\n\ | |
| 1089 number of elements read is not an exact multiple of @var{nr}, the last\n\ | |
| 1090 column is padded with zeros.\n\ | |
| 1091 \n\ | |
| 1092 @item [@var{nr}, @var{nc}]\n\ | |
| 1093 Read up to @code{@var{nr} * @var{nc}} elements, returning a matrix with\n\ | |
| 1094 @var{nr} rows. If the number of elements read is not an exact multiple\n\ | |
| 1095 of @var{nr}, the last column is padded with zeros.\n\ | |
| 1096 @end table\n\ | |
| 2122 | 1097 \n\ |
| 3372 | 1098 @noindent\n\ |
| 1099 If @var{size} is omitted, a value of @code{Inf} is assumed.\n\ | |
| 2122 | 1100 \n\ |
| 3372 | 1101 A string is returned if @var{template} specifies only character\n\ |
| 1102 conversions.\n\ | |
| 2215 | 1103 \n\ |
| 3372 | 1104 The number of items successfully read is returned in @var{count}.\n\ |
| 2215 | 1105 \n\ |
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1106 If an error occurs, @var{errmsg} contains a system-dependent error message.\n\ |
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1107 \n\ |
| 3372 | 1108 In the second form, read from @var{fid} according to @var{template},\n\ |
| 1109 with each conversion specifier in @var{template} corresponding to a\n\ | |
| 1110 single scalar return value. This form is more `C-like', and also\n\ | |
| 3491 | 1111 compatible with previous versions of Octave. The number of successful\n\ |
| 1112 conversions is returned in @var{count}\n\ | |
| 5653 | 1113 @ifclear OCTAVE_MANUAL\n\ |
| 1114 \n\ | |
| 1115 See the Formatted Input section of the GNU Octave manual for a\n\ | |
| 1116 complete description of the syntax of the template string.\n\ | |
| 1117 @end ifclear\n\ | |
| 7781 | 1118 @seealso{scanf, sscanf, fread, fprintf, fgets, fputs}\n\ |
| 5642 | 1119 @end deftypefn") |
| 1181 | 1120 { |
| 4468 | 1121 static std::string who = "fscanf"; |
| 1122 | |
| 2095 | 1123 octave_value_list retval; |
| 1181 | 1124 |
| 1125 int nargin = args.length (); | |
| 1126 | |
| 2215 | 1127 if (nargin == 3 && args(2).is_string ()) |
| 2095 | 1128 { |
| 4468 | 1129 octave_stream os = octave_stream_list::lookup (args(0), who); |
| 1181 | 1130 |
| 3341 | 1131 if (! error_state) |
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1132 { |
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1133 if (args(1).is_string ()) |
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1134 retval = os.oscanf (args(1), who); |
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1135 else |
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1136 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1137 } |
| 2095 | 1138 } |
| 1181 | 1139 else |
| 2215 | 1140 { |
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1141 retval(2) = "unknown error"; |
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1142 retval(1) = 0.0; |
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1143 retval(0) = Matrix (); |
| 2215 | 1144 |
| 1145 if (nargin == 2 || nargin == 3) | |
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1146 { |
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1147 octave_stream os = octave_stream_list::lookup (args(0), who); |
| 2215 | 1148 |
|
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1149 if (! error_state) |
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1150 { |
|
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1151 if (args(1).is_string ()) |
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1152 { |
|
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1153 octave_idx_type count = 0; |
| 2215 | 1154 |
|
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1155 Array<double> size = (nargin == 3) |
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1156 ? args(2).vector_value () |
|
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attempt better backward compatibility for Array constructors
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1157 : Array<double> (dim_vector (1, 1), lo_ieee_inf_value ()); |
| 2215 | 1158 |
|
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1159 if (! error_state) |
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1160 { |
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1161 octave_value tmp = os.scanf (args(1), size, count, who); |
| 2215 | 1162 |
|
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1163 if (! error_state) |
|
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1164 { |
|
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1165 retval(2) = os.error (); |
|
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1166 retval(1) = count; |
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1167 retval(0) = tmp; |
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1168 } |
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1169 } |
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1170 } |
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1171 else |
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1172 ::error ("%s: format must be a string", who.c_str ()); |
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1173 } |
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1174 } |
| 2215 | 1175 else |
|
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1176 print_usage (); |
| 2215 | 1177 } |
| 1181 | 1178 |
| 1179 return retval; | |
| 1180 } | |
| 1181 | |
|
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1182 static std::string |
|
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1183 get_sscanf_data (const octave_value& val) |
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1184 { |
|
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1185 std::string retval; |
|
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1186 |
|
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1187 if (val.is_string ()) |
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1188 { |
|
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1189 octave_value tmp = val.reshape (dim_vector (1, val.numel ())); |
|
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1190 |
|
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1191 retval = tmp.string_value (); |
|
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1192 } |
|
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1193 else |
|
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1194 ::error ("sscanf: argument STRING must be a string"); |
|
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1195 |
|
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1196 return retval; |
|
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1197 } |
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1198 |
| 2095 | 1199 DEFUN (sscanf, args, , |
| 3372 | 1200 "-*- texinfo -*-\n\ |
|
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1201 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}, @var{pos}] =} sscanf (@var{string}, @var{template}, @var{size})\n\ |
|
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1202 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}] =} sscanf (@var{string}, @var{template}, \"C\")\n\ |
| 3372 | 1203 This is like @code{fscanf}, except that the characters are taken from the\n\ |
| 1204 string @var{string} instead of from a stream. Reaching the end of the\n\ | |
|
12993
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|
1205 string is treated as an end-of-file condition. In addition to the values\n\ |
|
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|
1206 returned by @code{fscanf}, the index of the next character to be read\n\ |
|
13929
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Grammarcheck of documentation before 3.6.0 release.
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|
1207 is returned in @var{pos}.\n\ |
| 5642 | 1208 @seealso{fscanf, scanf, sprintf}\n\ |
| 1209 @end deftypefn") | |
| 444 | 1210 { |
| 4468 | 1211 static std::string who = "sscanf"; |
| 1212 | |
| 2095 | 1213 octave_value_list retval; |
| 444 | 1214 |
| 506 | 1215 int nargin = args.length (); |
| 1216 | |
| 2215 | 1217 if (nargin == 3 && args(2).is_string ()) |
| 2095 | 1218 { |
|
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|
1219 std::string data = get_sscanf_data (args(0)); |
|
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|
1220 |
|
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|
1221 if (! error_state) |
|
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1222 { |
|
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1223 octave_stream os = octave_istrstream::create (data); |
| 1358 | 1224 |
|
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1225 if (os.is_valid ()) |
|
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1226 { |
|
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|
1227 if (args(1).is_string ()) |
|
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1228 retval = os.oscanf (args(1), who); |
|
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1229 else |
|
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|
1230 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
|
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1231 } |
|
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|
1232 else |
|
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1233 ::error ("%s: unable to create temporary input buffer", |
|
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1234 who.c_str ()); |
|
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1235 } |
| 636 | 1236 else |
|
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|
1237 ::error ("%s: argument STRING must be a string", who.c_str ()); |
| 444 | 1238 } |
| 1239 else | |
| 2215 | 1240 { |
| 1241 if (nargin == 2 || nargin == 3) | |
|
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1242 { |
|
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|
1243 retval(3) = -1.0; |
|
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1244 retval(2) = "unknown error"; |
|
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1245 retval(1) = 0.0; |
|
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1246 retval(0) = Matrix (); |
| 2215 | 1247 |
|
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|
1248 std::string data = get_sscanf_data (args(0)); |
|
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1249 |
|
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1250 if (! error_state) |
|
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1251 { |
|
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|
1252 octave_stream os = octave_istrstream::create (data); |
| 2215 | 1253 |
|
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|
1254 if (os.is_valid ()) |
|
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1255 { |
|
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|
1256 if (args(1).is_string ()) |
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1257 { |
|
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|
1258 octave_idx_type count = 0; |
| 2215 | 1259 |
|
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|
1260 Array<double> size = (nargin == 3) |
|
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|
1261 ? args(2).vector_value () |
|
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|
1262 : Array<double> (dim_vector (1, 1), |
|
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|
1263 lo_ieee_inf_value ()); |
| 2215 | 1264 |
|
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|
1265 octave_value tmp = os.scanf (args(1), size, count, who); |
| 2215 | 1266 |
|
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1267 if (! error_state) |
|
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|
1268 { |
|
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|
1269 // FIXME -- is this the right thing to do? |
|
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|
1270 // Extract error message first, because getting |
|
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|
1271 // position will clear it. |
|
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|
1272 std::string errmsg = os.error (); |
| 2215 | 1273 |
|
12997
bac0858b92ee
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|
1274 retval(3) |
|
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|
1275 = (os.eof () ? data.length () : os.tell ()) + 1; |
|
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|
1276 retval(2) = errmsg; |
|
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|
1277 retval(1) = count; |
|
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|
1278 retval(0) = tmp; |
|
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|
1279 } |
|
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|
1280 } |
|
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|
1281 else |
|
12483
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|
1282 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
|
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|
1283 } |
|
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|
1284 else |
|
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|
1285 ::error ("%s: unable to create temporary input buffer", |
|
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|
1286 who.c_str ()); |
|
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|
1287 } |
|
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|
1288 } |
| 2215 | 1289 else |
|
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|
1290 print_usage (); |
| 2215 | 1291 } |
| 444 | 1292 |
| 1293 return retval; | |
| 1294 } | |
| 1295 | |
| 2215 | 1296 DEFUN (scanf, args, nargout, |
| 3372 | 1297 "-*- texinfo -*-\n\ |
|
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1298 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}] =} scanf (@var{template}, @var{size})\n\ |
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1299 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}]] =} scanf (@var{template}, \"C\")\n\ |
| 3372 | 1300 This is equivalent to calling @code{fscanf} with @var{fid} = @code{stdin}.\n\ |
| 1301 \n\ | |
| 1302 It is currently not useful to call @code{scanf} in interactive\n\ | |
| 1303 programs.\n\ | |
| 5642 | 1304 @seealso{fscanf, sscanf, printf}\n\ |
| 1305 @end deftypefn") | |
| 2215 | 1306 { |
| 1307 int nargin = args.length (); | |
| 1308 | |
| 1309 octave_value_list tmp_args (nargin+1, octave_value ()); | |
| 1310 | |
| 1311 tmp_args (0) = 0.0; | |
| 1312 for (int i = 0; i < nargin; i++) | |
| 1313 tmp_args (i+1) = args (i); | |
| 1314 | |
| 1315 return Ffscanf (tmp_args, nargout); | |
| 1316 } | |
| 1317 | |
| 2116 | 1318 static octave_value |
| 1319 do_fread (octave_stream& os, const octave_value& size_arg, | |
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1320 const octave_value& prec_arg, const octave_value& skip_arg, |
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1321 const octave_value& arch_arg, octave_idx_type& count) |
| 2116 | 1322 { |
| 1323 octave_value retval; | |
| 1324 | |
| 1325 count = -1; | |
| 1326 | |
| 3810 | 1327 Array<double> size = size_arg.vector_value (); |
| 2116 | 1328 |
| 1329 if (! error_state) | |
| 1330 { | |
| 3523 | 1331 std::string prec = prec_arg.string_value (); |
| 2116 | 1332 |
| 1333 if (! error_state) | |
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1334 { |
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1335 int block_size = 1; |
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1336 oct_data_conv::data_type input_type; |
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1337 oct_data_conv::data_type output_type; |
| 4944 | 1338 |
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1339 oct_data_conv::string_to_data_type (prec, block_size, |
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1340 input_type, output_type); |
| 2116 | 1341 |
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1342 if (! error_state) |
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1343 { |
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1344 int skip = skip_arg.int_value (true); |
| 2116 | 1345 |
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1346 if (! error_state) |
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1347 { |
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1348 std::string arch = arch_arg.string_value (); |
| 3202 | 1349 |
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1350 if (! error_state) |
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1351 { |
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1352 oct_mach_info::float_format flt_fmt |
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1353 = oct_mach_info::string_to_float_format (arch); |
| 2116 | 1354 |
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1355 if (! error_state) |
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1356 retval = os.read (size, block_size, input_type, |
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1357 output_type, skip, flt_fmt, count); |
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1358 } |
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1359 else |
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1360 ::error ("fread: ARCH architecture type must be a string"); |
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1361 } |
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1362 else |
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1363 ::error ("fread: SKIP must be an integer"); |
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1364 } |
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1365 else |
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1366 ::error ("fread: invalid PRECISION specified"); |
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1367 } |
| 2116 | 1368 else |
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1369 ::error ("fread: PRECISION must be a string"); |
| 2116 | 1370 } |
| 1371 else | |
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1372 ::error ("fread: invalid SIZE specified"); |
| 2116 | 1373 |
| 1374 return retval; | |
| 1375 } | |
| 1376 | |
| 1377 DEFUN (fread, args, , | |
| 3372 | 1378 "-*- texinfo -*-\n\ |
| 1379 @deftypefn {Built-in Function} {[@var{val}, @var{count}] =} fread (@var{fid}, @var{size}, @var{precision}, @var{skip}, @var{arch})\n\ | |
| 1380 Read binary data of type @var{precision} from the specified file ID\n\ | |
| 1381 @var{fid}.\n\ | |
| 1382 \n\ | |
| 1383 The optional argument @var{size} specifies the amount of data to read\n\ | |
| 1384 and may be one of\n\ | |
| 1385 \n\ | |
| 1386 @table @code\n\ | |
| 1387 @item Inf\n\ | |
| 1388 Read as much as possible, returning a column vector.\n\ | |
| 529 | 1389 \n\ |
| 3372 | 1390 @item @var{nr}\n\ |
| 1391 Read up to @var{nr} elements, returning a column vector.\n\ | |
| 1392 \n\ | |
| 1393 @item [@var{nr}, Inf]\n\ | |
| 1394 Read as much as possible, returning a matrix with @var{nr} rows. If the\n\ | |
| 1395 number of elements read is not an exact multiple of @var{nr}, the last\n\ | |
| 1396 column is padded with zeros.\n\ | |
| 1397 \n\ | |
| 1398 @item [@var{nr}, @var{nc}]\n\ | |
| 1399 Read up to @code{@var{nr} * @var{nc}} elements, returning a matrix with\n\ | |
| 1400 @var{nr} rows. If the number of elements read is not an exact multiple\n\ | |
| 1401 of @var{nr}, the last column is padded with zeros.\n\ | |
| 1402 @end table\n\ | |
| 1403 \n\ | |
| 1404 @noindent\n\ | |
| 1405 If @var{size} is omitted, a value of @code{Inf} is assumed.\n\ | |
| 2318 | 1406 \n\ |
| 3372 | 1407 The optional argument @var{precision} is a string specifying the type of\n\ |
| 1408 data to read and may be one of\n\ | |
| 1409 \n\ | |
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1410 @table @asis\n\ |
| 4944 | 1411 @item \"schar\"\n\ |
| 1412 @itemx \"signed char\"\n\ | |
| 3372 | 1413 Signed character.\n\ |
| 529 | 1414 \n\ |
| 4944 | 1415 @item \"uchar\"\n\ |
| 1416 @itemx \"unsigned char\"\n\ | |
| 3372 | 1417 Unsigned character.\n\ |
| 1418 \n\ | |
| 4944 | 1419 @item \"int8\"\n\ |
| 1420 @itemx \"integer*1\"\n\ | |
| 1421 \n\ | |
| 1422 8-bit signed integer.\n\ | |
| 2318 | 1423 \n\ |
| 4944 | 1424 @item \"int16\"\n\ |
| 1425 @itemx \"integer*2\"\n\ | |
| 1426 16-bit signed integer.\n\ | |
| 3372 | 1427 \n\ |
| 4944 | 1428 @item \"int32\"\n\ |
| 1429 @itemx \"integer*4\"\n\ | |
| 1430 32-bit signed integer.\n\ | |
| 3372 | 1431 \n\ |
| 4944 | 1432 @item \"int64\"\n\ |
| 1433 @itemx \"integer*8\"\n\ | |
| 1434 64-bit signed integer.\n\ | |
| 1435 \n\ | |
| 1436 @item \"uint8\"\n\ | |
| 1437 8-bit unsigned integer.\n\ | |
| 529 | 1438 \n\ |
| 4944 | 1439 @item \"uint16\"\n\ |
| 1440 16-bit unsigned integer.\n\ | |
| 3372 | 1441 \n\ |
| 4944 | 1442 @item \"uint32\"\n\ |
| 1443 32-bit unsigned integer.\n\ | |
| 3372 | 1444 \n\ |
| 4944 | 1445 @item \"uint64\"\n\ |
| 1446 64-bit unsigned integer.\n\ | |
| 1447 \n\ | |
| 1448 @item \"single\"\n\ | |
| 3372 | 1449 @itemx \"float32\"\n\ |
| 1450 @itemx \"real*4\"\n\ | |
| 4944 | 1451 32-bit floating point number.\n\ |
| 3372 | 1452 \n\ |
| 1453 @item \"double\"\n\ | |
| 1454 @itemx \"float64\"\n\ | |
| 1455 @itemx \"real*8\"\n\ | |
| 4944 | 1456 64-bit floating point number.\n\ |
| 1457 \n\ | |
| 1458 @item \"char\"\n\ | |
| 1459 @itemx \"char*1\"\n\ | |
| 1460 Single character.\n\ | |
| 3372 | 1461 \n\ |
| 4944 | 1462 @item \"short\"\n\ |
| 1463 Short integer (size is platform dependent).\n\ | |
| 1464 \n\ | |
| 1465 @item \"int\"\n\ | |
| 1466 Integer (size is platform dependent).\n\ | |
| 1467 \n\ | |
| 1468 @item \"long\"\n\ | |
| 1469 Long integer (size is platform dependent).\n\ | |
| 3372 | 1470 \n\ |
| 4944 | 1471 @item \"ushort\"\n\ |
| 1472 @itemx \"unsigned short\"\n\ | |
| 1473 Unsigned short integer (size is platform dependent).\n\ | |
| 4610 | 1474 \n\ |
| 4944 | 1475 @item \"uint\"\n\ |
| 1476 @itemx \"unsigned int\"\n\ | |
| 1477 Unsigned integer (size is platform dependent).\n\ | |
| 4610 | 1478 \n\ |
| 4944 | 1479 @item \"ulong\"\n\ |
| 1480 @itemx \"unsigned long\"\n\ | |
| 1481 Unsigned long integer (size is platform dependent).\n\ | |
| 1482 \n\ | |
| 1483 @item \"float\"\n\ | |
| 1484 Single precision floating point number (size is platform dependent).\n\ | |
| 3372 | 1485 @end table\n\ |
| 1486 \n\ | |
| 1487 @noindent\n\ | |
| 1488 The default precision is @code{\"uchar\"}.\n\ | |
| 2318 | 1489 \n\ |
| 4944 | 1490 The @var{precision} argument may also specify an optional repeat\n\ |
| 1491 count. For example, @samp{32*single} causes @code{fread} to read\n\ | |
| 1492 a block of 32 single precision floating point numbers. Reading in\n\ | |
| 1493 blocks is useful in combination with the @var{skip} argument.\n\ | |
| 1494 \n\ | |
| 1495 The @var{precision} argument may also specify a type conversion.\n\ | |
| 1496 For example, @samp{int16=>int32} causes @code{fread} to read 16-bit\n\ | |
| 1497 integer values and return an array of 32-bit integer values. By\n\ | |
| 1498 default, @code{fread} returns a double precision array. The special\n\ | |
| 1499 form @samp{*TYPE} is shorthand for @samp{TYPE=>TYPE}.\n\ | |
| 1500 \n\ | |
| 7096 | 1501 The conversion and repeat counts may be combined. For example, the\n\ |
| 1502 specification @samp{32*single=>single} causes @code{fread} to read\n\ | |
| 1503 blocks of single precision floating point values and return an array\n\ | |
| 1504 of single precision values instead of the default array of double\n\ | |
| 1505 precision values.\n\ | |
| 4944 | 1506 \n\ |
| 3372 | 1507 The optional argument @var{skip} specifies the number of bytes to skip\n\ |
| 4944 | 1508 after each element (or block of elements) is read. If it is not\n\ |
| 1509 specified, a value of 0 is assumed. If the final block read is not\n\ | |
| 1510 complete, the final skip is omitted. For example,\n\ | |
| 1511 \n\ | |
| 1512 @example\n\ | |
| 1513 fread (f, 10, \"3*single=>single\", 8)\n\ | |
| 1514 @end example\n\ | |
| 1515 \n\ | |
| 1516 @noindent\n\ | |
| 1517 will omit the final 8-byte skip because the last read will not be\n\ | |
| 1518 a complete block of 3 values.\n\ | |
| 3372 | 1519 \n\ |
| 1520 The optional argument @var{arch} is a string specifying the data format\n\ | |
| 1521 for the file. Valid values are\n\ | |
| 529 | 1522 \n\ |
| 3372 | 1523 @table @code\n\ |
| 1524 @item \"native\"\n\ | |
| 1525 The format of the current machine.\n\ | |
| 1526 \n\ | |
| 4546 | 1527 @item \"ieee-be\"\n\ |
| 3372 | 1528 IEEE big endian.\n\ |
| 1529 \n\ | |
| 4546 | 1530 @item \"ieee-le\"\n\ |
| 3372 | 1531 IEEE little endian.\n\ |
| 2318 | 1532 \n\ |
| 3372 | 1533 @item \"vaxd\"\n\ |
| 1534 VAX D floating format.\n\ | |
| 1535 \n\ | |
| 1536 @item \"vaxg\"\n\ | |
| 1537 VAX G floating format.\n\ | |
| 2318 | 1538 \n\ |
| 3372 | 1539 @item \"cray\"\n\ |
| 1540 Cray floating format.\n\ | |
| 1541 @end table\n\ | |
| 2318 | 1542 \n\ |
| 3372 | 1543 @noindent\n\ |
| 1544 Conversions are currently only supported for @code{\"ieee-be\"} and\n\ | |
| 1545 @code{\"ieee-le\"} formats.\n\ | |
| 2318 | 1546 \n\ |
| 3372 | 1547 The data read from the file is returned in @var{val}, and the number of\n\ |
| 1548 values read is returned in @code{count}\n\ | |
| 5642 | 1549 @seealso{fwrite, fopen, fclose}\n\ |
| 1550 @end deftypefn") | |
| 529 | 1551 { |
| 2095 | 1552 octave_value_list retval; |
| 2116 | 1553 |
| 1554 int nargin = args.length (); | |
| 1555 | |
| 2318 | 1556 if (nargin > 0 && nargin < 6) |
| 2116 | 1557 { |
| 1558 retval(1) = -1.0; | |
| 1559 retval(0) = Matrix (); | |
| 1560 | |
| 3341 | 1561 octave_stream os = octave_stream_list::lookup (args(0), "fread"); |
| 2116 | 1562 |
| 3341 | 1563 if (! error_state) |
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1564 { |
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1565 octave_value size = lo_ieee_inf_value (); |
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1566 octave_value prec = "uchar"; |
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1567 octave_value skip = 0; |
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1568 octave_value arch = "unknown"; |
| 2116 | 1569 |
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1570 int idx = 1; |
| 2116 | 1571 |
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1572 if (nargin > idx && ! args(idx).is_string ()) |
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1573 size = args(idx++); |
| 4257 | 1574 |
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1575 if (nargin > idx) |
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1576 prec = args(idx++); |
| 2116 | 1577 |
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1578 if (nargin > idx) |
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1579 skip = args(idx++); |
| 4257 | 1580 |
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1581 if (nargin > idx) |
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1582 arch = args(idx++); |
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1583 else if (skip.is_string ()) |
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1584 { |
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1585 arch = skip; |
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1586 skip = 0; |
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1587 } |
| 2116 | 1588 |
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1589 octave_idx_type count = -1; |
| 2116 | 1590 |
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1591 octave_value tmp = do_fread (os, size, prec, skip, arch, count); |
| 2116 | 1592 |
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1593 retval(1) = count; |
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1594 retval(0) = tmp; |
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1595 } |
| 2116 | 1596 } |
| 1597 else | |
| 5823 | 1598 print_usage (); |
| 2116 | 1599 |
| 529 | 1600 return retval; |
| 1601 } | |
| 1602 | |
| 2116 | 1603 static int |
| 1604 do_fwrite (octave_stream& os, const octave_value& data, | |
|
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1605 const octave_value& prec_arg, const octave_value& skip_arg, |
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1606 const octave_value& arch_arg) |
| 2116 | 1607 { |
| 1608 int retval = -1; | |
| 1609 | |
| 3523 | 1610 std::string prec = prec_arg.string_value (); |
| 2116 | 1611 |
| 1612 if (! error_state) | |
| 1613 { | |
| 4944 | 1614 int block_size = 1; |
| 1615 oct_data_conv::data_type output_type; | |
| 1616 | |
| 1617 oct_data_conv::string_to_data_type (prec, block_size, output_type); | |
| 2116 | 1618 |
| 1619 if (! error_state) | |
|
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1620 { |
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1621 int skip = skip_arg.int_value (true); |
| 2116 | 1622 |
|
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1623 if (! error_state) |
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1624 { |
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1625 std::string arch = arch_arg.string_value (); |
| 3202 | 1626 |
|
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1627 if (! error_state) |
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1628 { |
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1629 oct_mach_info::float_format flt_fmt |
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1630 = oct_mach_info::string_to_float_format (arch); |
| 2116 | 1631 |
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1632 if (! error_state) |
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1633 retval = os.write (data, block_size, output_type, |
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1634 skip, flt_fmt); |
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1635 } |
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1636 else |
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1637 ::error ("fwrite: ARCH architecture type must be a string"); |
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1638 } |
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1639 else |
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1640 ::error ("fwrite: SKIP must be an integer"); |
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1641 } |
| 3202 | 1642 else |
|
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1643 ::error ("fwrite: invalid PRECISION specified"); |
| 2116 | 1644 } |
| 1645 else | |
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1646 ::error ("fwrite: PRECISION must be a string"); |
| 2116 | 1647 |
| 1648 return retval; | |
| 1649 } | |
| 1650 | |
| 1651 DEFUN (fwrite, args, , | |
| 3372 | 1652 "-*- texinfo -*-\n\ |
| 1653 @deftypefn {Built-in Function} {@var{count} =} fwrite (@var{fid}, @var{data}, @var{precision}, @var{skip}, @var{arch})\n\ | |
| 1654 Write data in binary form of type @var{precision} to the specified file\n\ | |
| 1655 ID @var{fid}, returning the number of values successfully written to the\n\ | |
| 1656 file.\n\ | |
| 1181 | 1657 \n\ |
| 3372 | 1658 The argument @var{data} is a matrix of values that are to be written to\n\ |
| 1659 the file. The values are extracted in column-major order.\n\ | |
| 1181 | 1660 \n\ |
| 3372 | 1661 The remaining arguments @var{precision}, @var{skip}, and @var{arch} are\n\ |
| 1662 optional, and are interpreted as described for @code{fread}.\n\ | |
| 1181 | 1663 \n\ |
| 3372 | 1664 The behavior of @code{fwrite} is undefined if the values in @var{data}\n\ |
| 1665 are too large to fit in the specified precision.\n\ | |
| 5642 | 1666 @seealso{fread, fopen, fclose}\n\ |
| 1667 @end deftypefn") | |
| 1181 | 1668 { |
| 4233 | 1669 octave_value retval = -1; |
| 2116 | 1670 |
| 1671 int nargin = args.length (); | |
| 1672 | |
| 1673 if (nargin > 1 && nargin < 6) | |
| 1674 { | |
| 3341 | 1675 octave_stream os = octave_stream_list::lookup (args(0), "fwrite"); |
| 2116 | 1676 |
| 3341 | 1677 if (! error_state) |
|
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1678 { |
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1679 octave_value prec = "uchar"; |
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1680 octave_value skip = 0; |
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1681 octave_value arch = "unknown"; |
| 2318 | 1682 |
|
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1683 int idx = 1; |
|
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1684 |
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1685 octave_value data = args(idx++); |
|
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1686 |
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1687 if (nargin > idx) |
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1688 prec = args(idx++); |
| 2318 | 1689 |
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1690 if (nargin > idx) |
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1691 skip = args(idx++); |
| 2318 | 1692 |
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1693 if (nargin > idx) |
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1694 arch = args(idx++); |
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1695 else if (skip.is_string ()) |
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1696 { |
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1697 arch = skip; |
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1698 skip = 0; |
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1699 } |
| 2116 | 1700 |
|
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1701 double status = do_fwrite (os, data, prec, skip, arch); |
| 2825 | 1702 |
|
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1703 retval = status; |
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1704 } |
| 2116 | 1705 } |
| 1706 else | |
| 5823 | 1707 print_usage (); |
| 2116 | 1708 |
| 1181 | 1709 return retval; |
| 1710 } | |
| 1711 | |
| 5906 | 1712 DEFUNX ("feof", Ffeof, args, , |
| 3372 | 1713 "-*- texinfo -*-\n\ |
| 1714 @deftypefn {Built-in Function} {} feof (@var{fid})\n\ | |
| 1715 Return 1 if an end-of-file condition has been encountered for a given\n\ | |
| 1716 file and 0 otherwise. Note that it will only return 1 if the end of the\n\ | |
| 1717 file has already been encountered, not if the next read operation will\n\ | |
| 1718 result in an end-of-file condition.\n\ | |
| 5642 | 1719 @seealso{fread, fopen, fclose}\n\ |
| 1720 @end deftypefn") | |
| 529 | 1721 { |
| 4233 | 1722 octave_value retval = -1; |
| 529 | 1723 |
| 1724 int nargin = args.length (); | |
| 1725 | |
| 2095 | 1726 if (nargin == 1) |
| 1727 { | |
| 3341 | 1728 octave_stream os = octave_stream_list::lookup (args(0), "feof"); |
| 444 | 1729 |
| 3341 | 1730 if (! error_state) |
|
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1731 retval = os.eof () ? 1.0 : 0.0; |
| 2095 | 1732 } |
| 529 | 1733 else |
| 5823 | 1734 print_usage (); |
| 444 | 1735 |
| 1736 return retval; | |
| 1737 } | |
| 1738 | |
| 5906 | 1739 DEFUNX ("ferror", Fferror, args, , |
| 3372 | 1740 "-*- texinfo -*-\n\ |
|
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1741 @deftypefn {Built-in Function} {[@var{err}, @var{msg}] =} ferror (@var{fid}, \"clear\")\n\ |
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1742 Return 1 if an error condition has been encountered for the file ID\n\ |
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1743 @var{fid} and 0 otherwise. Note that it will only return 1 if an error\n\ |
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1744 has already been encountered, not if the next operation will result in\n\ |
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1745 an error condition.\n\ |
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1746 \n\ |
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1747 The second argument is optional. If it is supplied, also clear the\n\ |
| 3372 | 1748 error condition.\n\ |
| 1749 @end deftypefn") | |
| 1230 | 1750 { |
| 2095 | 1751 octave_value_list retval; |
| 1230 | 1752 |
| 2095 | 1753 int nargin = args.length (); |
| 1230 | 1754 |
| 2095 | 1755 if (nargin == 1 || nargin == 2) |
| 1756 { | |
| 3341 | 1757 octave_stream os = octave_stream_list::lookup (args(0), "ferror"); |
| 1230 | 1758 |
| 3341 | 1759 if (! error_state) |
|
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1760 { |
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1761 bool clear = false; |
| 1230 | 1762 |
|
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1763 if (nargin == 2) |
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1764 { |
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1765 std::string opt = args(1).string_value (); |
| 2095 | 1766 |
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1767 if (! error_state) |
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1768 clear = (opt == "clear"); |
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1769 else |
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1770 return retval; |
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1771 } |
| 1755 | 1772 |
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1773 int error_number = 0; |
| 2095 | 1774 |
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1775 std::string error_message = os.error (clear, error_number); |
| 1230 | 1776 |
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1777 retval(1) = error_number; |
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1778 retval(0) = error_message; |
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1779 } |
| 1230 | 1780 } |
| 2095 | 1781 else |
| 5823 | 1782 print_usage (); |
| 1230 | 1783 |
| 1784 return retval; | |
| 1785 } | |
| 1786 | |
| 1957 | 1787 DEFUN (popen, args, , |
| 3301 | 1788 "-*- texinfo -*-\n\ |
| 4326 | 1789 @deftypefn {Built-in Function} {@var{fid} =} popen (@var{command}, @var{mode})\n\ |
| 3301 | 1790 Start a process and create a pipe. The name of the command to run is\n\ |
| 1791 given by @var{command}. The file identifier corresponding to the input\n\ | |
| 1792 or output stream of the process is returned in @var{fid}. The argument\n\ | |
| 1793 @var{mode} may be\n\ | |
| 1794 \n\ | |
| 1795 @table @code\n\ | |
| 1796 @item \"r\"\n\ | |
| 1797 The pipe will be connected to the standard output of the process, and\n\ | |
| 1798 open for reading.\n\ | |
| 1230 | 1799 \n\ |
| 3301 | 1800 @item \"w\"\n\ |
| 1801 The pipe will be connected to the standard input of the process, and\n\ | |
| 1802 open for writing.\n\ | |
| 1803 @end table\n\ | |
| 1804 \n\ | |
| 10840 | 1805 For example:\n\ |
| 1230 | 1806 \n\ |
| 3301 | 1807 @example\n\ |
| 1808 @group\n\ | |
| 1809 fid = popen (\"ls -ltr / | tail -3\", \"r\");\n\ | |
|
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1810 while (ischar (s = fgets (fid)))\n\ |
| 3301 | 1811 fputs (stdout, s);\n\ |
| 1812 endwhile\n\ | |
| 1813 @print{} drwxr-xr-x 33 root root 3072 Feb 15 13:28 etc\n\ | |
| 1814 @print{} drwxr-xr-x 3 root root 1024 Feb 15 13:28 lib\n\ | |
| 1815 @print{} drwxrwxrwt 15 root root 2048 Feb 17 14:53 tmp\n\ | |
| 1816 @end group\n\ | |
| 1817 @end example\n\ | |
| 1818 @end deftypefn") | |
| 1230 | 1819 { |
| 4233 | 1820 octave_value retval = -1; |
| 1230 | 1821 |
| 1822 int nargin = args.length (); | |
| 1823 | |
| 2095 | 1824 if (nargin == 2) |
| 1825 { | |
| 3523 | 1826 std::string name = args(0).string_value (); |
| 1230 | 1827 |
| 2095 | 1828 if (! error_state) |
|
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1829 { |
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1830 std::string mode = args(1).string_value (); |
| 1230 | 1831 |
|
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1832 if (! error_state) |
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1833 { |
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1834 if (mode == "r") |
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1835 { |
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1836 octave_stream ips = octave_iprocstream::create (name); |
| 1230 | 1837 |
|
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1838 retval = octave_stream_list::insert (ips); |
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1839 } |
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1840 else if (mode == "w") |
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1841 { |
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1842 octave_stream ops = octave_oprocstream::create (name); |
| 1230 | 1843 |
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1844 retval = octave_stream_list::insert (ops); |
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1845 } |
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1846 else |
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1847 ::error ("popen: invalid MODE specified"); |
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1848 } |
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1849 else |
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1850 ::error ("popen: MODE must be a string"); |
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1851 } |
| 2095 | 1852 else |
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1853 ::error ("popen: COMMAND must be a string"); |
| 2095 | 1854 } |
| 1230 | 1855 else |
| 5823 | 1856 print_usage (); |
| 1230 | 1857 |
| 1858 return retval; | |
| 1859 } | |
| 1860 | |
| 1957 | 1861 DEFUN (pclose, args, , |
| 3381 | 1862 "-*- texinfo -*-\n\ |
| 3301 | 1863 @deftypefn {Built-in Function} {} pclose (@var{fid})\n\ |
| 1864 Close a file identifier that was opened by @code{popen}. You may also\n\ | |
| 1865 use @code{fclose} for the same purpose.\n\ | |
| 1866 @end deftypefn") | |
| 1230 | 1867 { |
| 4233 | 1868 octave_value retval = -1; |
| 1230 | 1869 |
| 1870 int nargin = args.length (); | |
| 1871 | |
| 2095 | 1872 if (nargin == 1) |
| 4233 | 1873 retval = octave_stream_list::remove (args(0), "pclose"); |
| 1377 | 1874 else |
| 5823 | 1875 print_usage (); |
| 1379 | 1876 |
| 1877 return retval; | |
| 1878 } | |
| 1879 | |
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1880 DEFUNX ("tmpnam", Ftmpnam, args, , |
| 3372 | 1881 "-*- texinfo -*-\n\ |
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1882 @deftypefn {Built-in Function} {} tmpnam ()\n\ |
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1883 @deftypefnx {Built-in Function} {} tmpnam (@var{dir})\n\ |
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1884 @deftypefnx {Built-in Function} {} tmpnam (@var{dir}, @var{prefix})\n\ |
| 3372 | 1885 Return a unique temporary file name as a string.\n\ |
| 1886 \n\ | |
| 4267 | 1887 If @var{prefix} is omitted, a value of @code{\"oct-\"} is used.\n\ |
| 1888 If @var{dir} is also omitted, the default directory for temporary files\n\ | |
| 1889 is used. If @var{dir} is provided, it must exist, otherwise the default\n\ | |
| 1890 directory for temporary files is used. Since the named file is not\n\ | |
| 1891 opened, by @code{tmpnam}, it is possible (though relatively unlikely)\n\ | |
| 1892 that it will not be available by the time your program attempts to open it.\n\ | |
| 5642 | 1893 @seealso{tmpfile, mkstemp, P_tmpdir}\n\ |
| 1894 @end deftypefn") | |
| 1802 | 1895 { |
| 2095 | 1896 octave_value retval; |
| 1802 | 1897 |
| 2936 | 1898 int len = args.length (); |
| 1899 | |
| 1900 if (len < 3) | |
| 1901 { | |
| 3523 | 1902 std::string dir = len > 0 ? args(0).string_value () : std::string (); |
| 2936 | 1903 |
| 1904 if (! error_state) | |
|
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1905 { |
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1906 std::string pfx |
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1907 = len > 1 ? args(1).string_value () : std::string ("oct-"); |
| 4267 | 1908 |
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1909 if (! error_state) |
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1910 retval = octave_tempnam (dir, pfx); |
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1911 else |
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1912 ::error ("PREFIX must be a string"); |
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1913 } |
| 4267 | 1914 else |
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1915 ::error ("DIR argument must be a string"); |
| 2936 | 1916 } |
| 1802 | 1917 else |
| 5823 | 1918 print_usage (); |
| 1802 | 1919 |
| 1920 return retval; | |
| 1921 } | |
| 1922 | |
| 2458 | 1923 DEFALIAS (octave_tmp_file_name, tmpnam); |
| 1924 | |
| 4326 | 1925 DEFUN (tmpfile, args, , |
| 1926 "-*- texinfo -*-\n\ | |
| 1927 @deftypefn {Built-in Function} {[@var{fid}, @var{msg}] =} tmpfile ()\n\ | |
| 1928 Return the file ID corresponding to a new temporary file with a unique\n\ | |
| 1929 name. The file is opened in binary read/write (@code{\"w+b\"}) mode.\n\ | |
| 1930 The file will be deleted automatically when it is closed or when Octave\n\ | |
| 1931 exits.\n\ | |
| 1932 \n\ | |
| 1933 If successful, @var{fid} is a valid file ID and @var{msg} is an empty\n\ | |
| 1934 string. Otherwise, @var{fid} is -1 and @var{msg} contains a\n\ | |
| 1935 system-dependent error message.\n\ | |
| 5642 | 1936 @seealso{tmpnam, mkstemp, P_tmpdir}\n\ |
| 1937 @end deftypefn") | |
| 4326 | 1938 { |
| 1939 octave_value_list retval; | |
| 1940 | |
| 1941 retval(1) = std::string (); | |
| 1942 retval(0) = -1; | |
| 1943 | |
| 1944 int nargin = args.length (); | |
| 1945 | |
| 1946 if (nargin == 0) | |
| 1947 { | |
| 12775 | 1948 FILE *fid = gnulib::tmpfile (); |
| 4326 | 1949 |
| 1950 if (fid) | |
|
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1951 { |
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1952 std::string nm; |
| 4326 | 1953 |
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1954 std::ios::openmode md = fopen_mode_to_ios_mode ("w+b"); |
| 4326 | 1955 |
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1956 octave_stream s = octave_stdiostream::create (nm, fid, md); |
| 4326 | 1957 |
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1958 if (s) |
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1959 retval(0) = octave_stream_list::insert (s); |
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1960 else |
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1961 error ("tmpfile: failed to create octave_stdiostream object"); |
| 4326 | 1962 |
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1963 } |
| 4326 | 1964 else |
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1965 { |
| 10411 | 1966 retval(1) = gnulib::strerror (errno); |
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1967 retval(0) = -1; |
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1968 } |
| 4326 | 1969 } |
| 1970 else | |
| 5823 | 1971 print_usage (); |
| 4326 | 1972 |
| 1973 return retval; | |
| 1974 } | |
| 1975 | |
| 1976 DEFUN (mkstemp, args, , | |
| 1977 "-*- texinfo -*-\n\ | |
| 5109 | 1978 @deftypefn {Built-in Function} {[@var{fid}, @var{name}, @var{msg}] =} mkstemp (@var{template}, @var{delete})\n\ |
| 4326 | 1979 Return the file ID corresponding to a new temporary file with a unique\n\ |
| 1980 name created from @var{template}. The last six characters of @var{template}\n\ | |
| 5016 | 1981 must be @code{XXXXXX} and these are replaced with a string that makes the\n\ |
| 4326 | 1982 filename unique. The file is then created with mode read/write and\n\ |
| 1983 permissions that are system dependent (on GNU/Linux systems, the permissions\n\ | |
| 1984 will be 0600 for versions of glibc 2.0.7 and later). The file is opened\n\ | |
|
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1985 in binary mode and with the @w{@code{O_EXCL}} flag.\n\ |
| 4326 | 1986 \n\ |
| 1987 If the optional argument @var{delete} is supplied and is true,\n\ | |
| 1988 the file will be deleted automatically when Octave exits, or when\n\ | |
| 1989 the function @code{purge_tmp_files} is called.\n\ | |
| 1990 \n\ | |
| 1991 If successful, @var{fid} is a valid file ID, @var{name} is the name of\n\ | |
| 7001 | 1992 the file, and @var{msg} is an empty string. Otherwise, @var{fid}\n\ |
| 4326 | 1993 is -1, @var{name} is empty, and @var{msg} contains a system-dependent\n\ |
| 1994 error message.\n\ | |
| 5642 | 1995 @seealso{tmpfile, tmpnam, P_tmpdir}\n\ |
| 1996 @end deftypefn") | |
| 4326 | 1997 { |
| 1998 octave_value_list retval; | |
| 1999 | |
| 2000 retval(2) = std::string (); | |
| 2001 retval(1) = std::string (); | |
| 2002 retval(0) = -1; | |
| 2003 | |
| 2004 int nargin = args.length (); | |
| 2005 | |
| 2006 if (nargin == 1 || nargin == 2) | |
| 2007 { | |
| 2008 std::string tmpl8 = args(0).string_value (); | |
| 2009 | |
| 2010 if (! error_state) | |
|
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2011 { |
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2012 OCTAVE_LOCAL_BUFFER (char, tmp, tmpl8.size () + 1); |
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2013 strcpy (tmp, tmpl8.c_str ()); |
| 4326 | 2014 |
|
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2015 int fd = gnulib::mkostemp (tmp, O_BINARY); |
| 4326 | 2016 |
|
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2017 if (fd < 0) |
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2018 { |
| 10411 | 2019 retval(2) = gnulib::strerror (errno); |
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2020 retval(0) = fd; |
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2021 } |
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2022 else |
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2023 { |
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2024 const char *fopen_mode = "w+b"; |
| 4326 | 2025 |
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2026 FILE *fid = fdopen (fd, fopen_mode); |
| 4326 | 2027 |
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2028 if (fid) |
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2029 { |
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2030 std::string nm = tmp; |
| 4326 | 2031 |
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2032 std::ios::openmode md = fopen_mode_to_ios_mode (fopen_mode); |
| 4326 | 2033 |
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2034 octave_stream s = octave_stdiostream::create (nm, fid, md); |
| 4326 | 2035 |
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2036 if (s) |
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2037 { |
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2038 retval(1) = nm; |
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2039 retval(0) = octave_stream_list::insert (s); |
| 4326 | 2040 |
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2041 if (nargin == 2 && args(1).is_true ()) |
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2042 mark_for_deletion (nm); |
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2043 } |
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2044 else |
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2045 error ("mkstemp: failed to create octave_stdiostream object"); |
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2046 } |
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2047 else |
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2048 { |
| 10411 | 2049 retval(2) = gnulib::strerror (errno); |
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2050 retval(0) = -1; |
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2051 } |
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2052 } |
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2053 } |
| 4326 | 2054 else |
|
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2055 error ("mkstemp: TEMPLATE argument must be a string"); |
| 4326 | 2056 } |
| 2057 else | |
| 5823 | 2058 print_usage (); |
| 4326 | 2059 |
| 2060 return retval; | |
| 2061 } | |
| 2062 | |
| 1400 | 2063 static int |
| 2064 convert (int x, int ibase, int obase) | |
| 2065 { | |
| 2066 int retval = 0; | |
| 2067 | |
| 2068 int tmp = x % obase; | |
| 2069 | |
| 2070 if (tmp > ibase - 1) | |
| 2095 | 2071 ::error ("umask: invalid digit"); |
| 1400 | 2072 else |
| 2073 { | |
| 2074 retval = tmp; | |
| 2075 int mult = ibase; | |
| 2076 while ((x = (x - tmp) / obase)) | |
|
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2077 { |
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2078 tmp = x % obase; |
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2079 if (tmp > ibase - 1) |
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2080 { |
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2081 ::error ("umask: invalid digit"); |
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2082 break; |
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2083 } |
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2084 retval += mult * tmp; |
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2085 mult *= ibase; |
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2086 } |
| 1400 | 2087 } |
| 2088 | |
| 2089 return retval; | |
| 2090 } | |
| 2091 | |
|
10197
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attempt to avoid trouble with gnulib #defines in a consistent way
John W. Eaton <jwe@octave.org>
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10182
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2092 DEFUNX ("umask", Fumask, args, , |
| 3301 | 2093 "-*- texinfo -*-\n\ |
| 2094 @deftypefn {Built-in Function} {} umask (@var{mask})\n\ | |
| 2095 Set the permission mask for file creation. The parameter @var{mask}\n\ | |
| 4715 | 2096 is an integer, interpreted as an octal number. If successful,\n\ |
| 2097 returns the previous value of the mask (as an integer to be\n\ | |
| 2098 interpreted as an octal number); otherwise an error message is printed.\n\ | |
| 3301 | 2099 @end deftypefn") |
| 1400 | 2100 { |
| 2095 | 2101 octave_value_list retval; |
| 1400 | 2102 |
| 2103 int status = 0; | |
| 2104 | |
| 2105 if (args.length () == 1) | |
| 2106 { | |
| 3202 | 2107 int mask = args(0).int_value (true); |
| 1400 | 2108 |
| 3202 | 2109 if (! error_state) |
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2110 { |
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2111 if (mask < 0) |
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parents:
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2112 { |
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2113 status = -1; |
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|
2114 ::error ("umask: MASK must be a positive integer value"); |
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2115 } |
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2116 else |
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2117 { |
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2118 int oct_mask = convert (mask, 8, 10); |
| 1400 | 2119 |
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2120 if (! error_state) |
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|
2121 status = convert (octave_umask (oct_mask), 10, 8); |
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2122 } |
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2123 } |
| 3202 | 2124 else |
|
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2125 { |
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2126 status = -1; |
|
12483
7a5aacf65f81
Rewrite error strings in src/ to use variables named in documentation.
Rik <octave@nomad.inbox5.com>
parents:
12228
diff
changeset
|
2127 ::error ("umask: MASK must be an integer"); |
|
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|
2128 } |
| 1400 | 2129 } |
| 2130 else | |
| 5823 | 2131 print_usage (); |
| 1400 | 2132 |
| 2133 if (status >= 0) | |
| 4233 | 2134 retval(0) = status; |
| 1400 | 2135 |
| 2136 return retval; | |
| 2137 } | |
| 2138 | |
| 5749 | 2139 static octave_value |
| 6483 | 2140 const_value (const char *, const octave_value_list& args, int val) |
| 2189 | 2141 { |
| 5749 | 2142 octave_value retval; |
| 2143 | |
| 2144 int nargin = args.length (); | |
| 2145 | |
| 2146 if (nargin == 0) | |
| 2147 retval = val; | |
| 2148 else | |
| 5823 | 2149 print_usage (); |
| 5749 | 2150 |
| 2151 return retval; | |
| 2152 } | |
| 2153 | |
| 2154 DEFUNX ("P_tmpdir", FP_tmpdir, args, , | |
| 2155 "-*- texinfo -*-\n\ | |
| 2156 @deftypefn {Built-in Function} {} P_tmpdir ()\n\ | |
| 2157 Return the default name of the directory for temporary files on\n\ | |
| 2158 this system. The name of this directory is system dependent.\n\ | |
| 2159 @end deftypefn") | |
| 2160 { | |
| 2161 octave_value retval; | |
| 2162 | |
| 2163 int nargin = args.length (); | |
| 4267 | 2164 |
| 5749 | 2165 if (nargin == 0) |
|
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0f70c5db58c3
try to get better value than \ for P_tmpdir on Windows systems
John W. Eaton <jwe@octave.org>
parents:
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diff
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|
2166 retval = get_P_tmpdir (); |
| 5749 | 2167 else |
| 5823 | 2168 print_usage (); |
| 5749 | 2169 |
| 2170 return retval; | |
| 2171 } | |
| 2341 | 2172 |
| 5749 | 2173 // NOTE: the values of SEEK_SET, SEEK_CUR, and SEEK_END have to be |
| 2174 // this way for Matlab compatibility. | |
| 2175 | |
| 2176 DEFUNX ("SEEK_SET", FSEEK_SET, args, , | |
| 2177 "-*- texinfo -*-\n\ | |
| 10840 | 2178 @deftypefn {Built-in Function} {} SEEK_SET ()\n\ |
| 5749 | 2179 @deftypefnx {Built-in Function} {} SEEK_CUR ()\n\ |
| 2180 @deftypefnx {Built-in Function} {} SEEK_END ()\n\ | |
| 2181 Return the value required to request that @code{fseek} perform\n\ | |
| 2182 one of the following actions:\n\ | |
| 3372 | 2183 @table @code\n\ |
| 2184 @item SEEK_SET\n\ | |
| 2185 Position file relative to the beginning.\n\ | |
| 2186 \n\ | |
| 2187 @item SEEK_CUR\n\ | |
| 2188 Position file relative to the current position.\n\ | |
| 2189 \n\ | |
| 2190 @item SEEK_END\n\ | |
| 5749 | 2191 Position file relative to the end.\n\ |
| 3372 | 2192 @end table\n\ |
| 5749 | 2193 @end deftypefn") |
| 2194 { | |
| 2195 return const_value ("SEEK_SET", args, -1); | |
| 2196 } | |
| 2189 | 2197 |
| 5749 | 2198 DEFUNX ("SEEK_CUR", FSEEK_CUR, args, , |
| 2199 "-*- texinfo -*-\n\ | |
| 2200 @deftypefn {Built-in Function} {} SEEK_CUR ()\n\ | |
| 3458 | 2201 See SEEK_SET.\n\ |
| 5749 | 2202 @end deftypefn") |
| 2203 { | |
| 2204 return const_value ("SEEK_CUR", args, 0); | |
| 2205 } | |
| 2189 | 2206 |
| 5749 | 2207 DEFUNX ("SEEK_END", FSEEK_END, args, , |
| 2208 "-*- texinfo -*-\n\ | |
| 2209 @deftypefn {Built-in Function} {} SEEK_END ()\n\ | |
| 3458 | 2210 See SEEK_SET.\n\ |
| 5749 | 2211 @end deftypefn") |
| 2212 { | |
| 2213 return const_value ("SEEK_END", args, 1); | |
| 2214 } | |
| 2215 | |
| 2216 static octave_value | |
| 6483 | 2217 const_value (const char *, const octave_value_list& args, |
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2218 const octave_value& val) |
| 5749 | 2219 { |
| 2220 octave_value retval; | |
| 2221 | |
| 2222 int nargin = args.length (); | |
| 2189 | 2223 |
| 5749 | 2224 if (nargin == 0) |
| 2225 retval = val; | |
| 2226 else | |
| 5823 | 2227 print_usage (); |
| 5749 | 2228 |
| 2229 return retval; | |
| 2230 } | |
| 2231 | |
| 2232 DEFUNX ("stdin", Fstdin, args, , | |
| 2233 "-*- texinfo -*-\n\ | |
| 2234 @deftypefn {Built-in Function} {} stdin ()\n\ | |
| 2235 Return the numeric value corresponding to the standard input stream.\n\ | |
| 2236 When Octave is used interactively, this is filtered through the command\n\ | |
| 2237 line editing functions.\n\ | |
| 5333 | 2238 @seealso{stdout, stderr}\n\ |
| 5749 | 2239 @end deftypefn") |
| 2240 { | |
| 2241 return const_value ("stdin", args, stdin_file); | |
| 2242 } | |
| 2189 | 2243 |
| 5749 | 2244 DEFUNX ("stdout", Fstdout, args, , |
| 2245 "-*- texinfo -*-\n\ | |
| 2246 @deftypefn {Built-in Function} {} stdout ()\n\ | |
| 2247 Return the numeric value corresponding to the standard output stream.\n\ | |
| 2248 Data written to the standard output is normally filtered through the pager.\n\ | |
| 5333 | 2249 @seealso{stdin, stderr}\n\ |
| 5749 | 2250 @end deftypefn") |
| 2251 { | |
| 2252 return const_value ("stdout", args, stdout_file); | |
| 2253 } | |
| 2189 | 2254 |
| 5749 | 2255 DEFUNX ("stderr", Fstderr, args, , |
| 2256 "-*- texinfo -*-\n\ | |
| 2257 @deftypefn {Built-in Function} {} stderr ()\n\ | |
| 2258 Return the numeric value corresponding to the standard error stream.\n\ | |
| 2259 Even if paging is turned on, the standard error is not sent to the\n\ | |
| 2260 pager. It is useful for error messages and prompts.\n\ | |
| 5333 | 2261 @seealso{stdin, stdout}\n\ |
| 5749 | 2262 @end deftypefn") |
| 2263 { | |
| 2264 return const_value ("stderr", args, stderr_file); | |
| 2189 | 2265 } |