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1
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1 // file-io.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 // Written by John C. Campbell <jcc@che.utexas.edu>. |
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25 |
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26 #ifdef __GNUG__ |
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27 #pragma implementation |
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28 #endif |
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29 |
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30 #include <DLList.h> |
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31 #include <unistd.h> |
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32 #include <string.h> |
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33 #include <stdio.h> |
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34 #include <stdlib.h> |
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35 #include <strstream.h> |
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36 #include <ctype.h> |
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37 |
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38 #include "statdefs.h" |
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39 #include "file-io.h" |
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40 #include "input.h" |
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41 #include "octave-hist.h" |
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42 #include "tree-const.h" |
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43 #include "error.h" |
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44 #include "utils.h" |
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45 #include "pager.h" |
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46 |
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47 // keeps a count of how many files are open and in the file list |
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48 static int file_count = 0; |
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49 |
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50 // keeps a count of args sent to printf or scanf |
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51 static int fmt_arg_count = 0; |
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52 |
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53 class File_info |
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54 { |
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55 public: |
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56 File_info (void); |
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57 File_info (int num, char *nm, FILE *t, char *md); |
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58 File_info (const File_info& f); |
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59 |
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60 File_info& operator = (const File_info& f); |
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61 |
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62 ~File_info (void); |
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63 |
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64 int number (void) const; |
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65 char *name (void) const; |
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66 FILE *fptr (void) const; |
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67 char *mode (void) const; |
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68 |
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69 private: |
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70 int _number; |
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71 char *_name; |
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72 FILE *_fptr; |
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73 char *_mode; |
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74 }; |
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75 |
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76 File_info::File_info (void) |
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77 { |
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78 _number = -1; |
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79 _name = (char *) NULL; |
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80 _fptr = (FILE *) NULL; |
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81 _mode = (char *) NULL; |
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82 } |
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83 |
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84 File_info::File_info (const File_info& f) |
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85 { |
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86 _number = f._number; |
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87 _name = strsave (f._name); |
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88 _fptr = f._fptr; |
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89 _mode = strsave (f._mode); |
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90 } |
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91 |
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92 File_info& |
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93 File_info::operator = (const File_info& f) |
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94 { |
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95 _number = f._number; |
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96 _name = strsave (f._name); |
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97 _fptr = f._fptr; |
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98 _mode = strsave (f._mode); |
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99 |
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100 return *this; |
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101 } |
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102 |
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103 File_info::~File_info (void) |
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104 { |
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105 delete [] _name; |
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106 delete [] _mode; |
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107 } |
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108 |
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109 File_info::File_info (int n, char *nm, FILE *t, char *md) |
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110 { |
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111 _number = n; |
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112 _name = strsave (nm); |
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113 _fptr = t; |
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114 _mode = strsave (md); |
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115 } |
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116 |
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117 int |
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118 File_info::number (void) const |
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119 { |
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120 return _number; |
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121 } |
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122 |
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123 char * |
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124 File_info::name (void) const |
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125 { |
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126 return _name; |
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127 } |
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128 |
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129 FILE * |
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130 File_info::fptr (void) const |
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131 { |
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132 return _fptr; |
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133 } |
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134 |
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135 char * |
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136 File_info::mode (void) const |
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137 { |
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138 return _mode; |
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139 } |
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140 |
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141 |
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142 // double linked list containing relevant information about open files |
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143 static DLList <File_info> file_list; |
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144 |
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145 void |
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146 initialize_file_io () |
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147 { |
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148 File_info _stdin (0, "stdin", stdin, "r"); |
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149 File_info _stdout (1, "stdout", stdout, "w"); |
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150 File_info _stderr (2, "stderr", stderr, "w"); |
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151 |
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152 file_list.append (_stdin); |
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153 file_list.append (_stdout); |
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154 file_list.append (_stderr); |
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155 |
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156 file_count = 3; |
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157 } |
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158 |
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159 Pix |
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160 return_valid_file (tree_constant& arg) |
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161 { |
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162 if (arg.is_string_type ()) |
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163 { |
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164 Pix p = file_list.first (); |
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165 File_info file; |
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166 for (int i = 0; i < file_count; i++) |
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167 { |
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168 char *file_name = arg.string_value (); |
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169 file = file_list (p); |
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170 if (strcmp (file.name (), file_name) == 0) |
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171 return p; |
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172 file_list.next (p); |
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173 } |
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174 } |
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175 else if (arg.is_scalar_type ()) |
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176 { |
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177 double file_num = arg.double_value (); |
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178 if ((double) NINT (file_num) != file_num) |
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179 error ("file number not an integer value"); |
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180 else |
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181 { |
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182 Pix p = file_list.first (); |
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183 File_info file; |
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184 for (int i = 0; i < file_count; i++) |
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185 { |
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186 file = file_list (p); |
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187 if (file.number () == file_num) |
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188 return p; |
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189 file_list.next (p); |
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190 } |
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191 error ("no file with that number"); |
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192 } |
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193 } |
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194 else |
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195 error ("inapproriate file specifier"); |
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196 |
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197 return (Pix) NULL; |
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198 } |
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199 |
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200 static Pix |
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201 fopen_file_for_user (tree_constant& arg, char *mode) |
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202 { |
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203 char *file_name = arg.string_value (); |
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204 |
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205 FILE *file_ptr = fopen (file_name, mode); |
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206 if (file_ptr != (FILE *) NULL) |
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207 { |
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208 File_info file (++file_count, file_name, file_ptr, mode); |
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209 file_list.append (file); |
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210 |
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211 Pix p = file_list.first (); |
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212 File_info file_from_list; |
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213 |
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214 for (int i = 0; i < file_count; i++) |
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215 { |
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216 file_from_list = file_list (p); |
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217 if (strcmp (file_from_list.name (), file_name) == 0) |
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218 return p; |
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219 file_list.next (p); |
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220 } |
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221 } |
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222 |
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223 error ("problems automatically opening file for user"); |
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224 return (Pix) NULL; |
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225 } |
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226 |
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227 |
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228 tree_constant * |
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229 fclose_internal (tree_constant *args) |
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230 { |
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231 tree_constant *retval = NULL_TREE_CONST; |
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232 |
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233 Pix p = return_valid_file (args[1]); |
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234 |
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235 if (p == (Pix) NULL) |
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236 return retval; |
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237 |
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238 File_info file = file_list (p); |
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239 |
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240 if (file.number () < 3) |
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241 { |
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242 warning ("fclose: can't close stdin, stdout, or stderr!"); |
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243 return retval; |
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244 } |
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245 |
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246 int success = fclose (file.fptr ()); |
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247 file_list.del (p); |
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248 file_count--; |
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249 |
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250 retval = new tree_constant[2]; |
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251 if (success == 0) |
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252 retval[0] = tree_constant (1.0); // succeeded |
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253 else |
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254 { |
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255 error ("fclose: error on closing file"); |
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256 retval[0] = tree_constant (0.0); // failed |
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257 } |
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258 |
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259 return retval; |
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260 } |
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261 |
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262 tree_constant * |
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263 fflush_internal (tree_constant *args) |
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264 { |
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265 tree_constant *retval = NULL_TREE_CONST; |
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266 |
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267 Pix p = return_valid_file (args[1]); |
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268 |
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269 if (p == (Pix) NULL) |
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270 return retval; |
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271 |
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272 File_info file = file_list (p); |
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273 |
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274 if (strcmp (file.mode (), "r") == 0) |
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275 { |
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276 warning ("can't flush an input stream"); |
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277 return retval; |
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278 } |
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279 |
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280 int success = 0; |
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281 if (file.number () == 1) |
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282 flush_output_to_pager (); |
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283 else |
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284 success = fflush (file.fptr ()); |
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285 |
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286 retval = new tree_constant[2]; |
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287 if (success == 0) |
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288 retval[0] = tree_constant (1.0); // succeeded |
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289 else |
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290 { |
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291 error ("fflush: write error"); |
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292 retval[0] = tree_constant (0.0); // failed |
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293 } |
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294 |
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295 return retval; |
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296 } |
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297 |
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298 static int |
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299 valid_mode (char *mode) |
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300 { |
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301 if (mode != (char *) NULL) |
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302 { |
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303 char m = mode[0]; |
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304 if (m == 'r' || m == 'w' || m == 'a') |
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305 { |
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306 m = mode[1]; |
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307 return (m == '\0' || (m == '+' && mode[2] == '\0')); |
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308 } |
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309 } |
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310 return 0; |
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311 } |
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312 |
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313 tree_constant * |
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314 fgets_internal (tree_constant *args, int nargout) |
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315 { |
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316 tree_constant *retval = NULL_TREE_CONST; |
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317 |
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318 Pix p = return_valid_file (args[1]); |
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319 |
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320 if (p == (Pix) NULL) |
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321 { |
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322 if (args[1].is_string_type ()) |
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323 { |
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324 struct stat buffer; |
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325 char *name = args[1].string_value (); |
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326 if (stat (name, &buffer) == 0 |
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327 && (buffer.st_mode & S_IFREG) == S_IFREG) |
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328 { |
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329 p = fopen_file_for_user (args[1], "r"); |
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330 } |
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331 else |
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332 { |
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333 error ("fgets: file dosen't exist"); |
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334 return retval; |
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335 } |
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336 } |
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337 else |
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338 return retval; |
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339 } |
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340 |
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341 int length = 0; |
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342 |
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343 if (args[2].is_scalar_type ()) |
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344 { |
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345 length = (int) args[2].double_value (); |
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346 if ((double) NINT (length) != length) |
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347 { |
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348 error ("fgets: length not an integer value"); |
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349 return retval; |
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350 } |
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351 } |
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352 |
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353 char string[length+1]; |
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354 File_info file = file_list (p); |
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355 char *success = fgets (string, length+1, file.fptr ()); |
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356 |
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357 if (success == (char *) NULL) |
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358 { |
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359 retval = new tree_constant[2]; |
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360 retval[0] = tree_constant (-1.0); |
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361 return retval; |
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362 } |
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363 |
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364 if (nargout == 2) |
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365 { |
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366 retval = new tree_constant[3]; |
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367 retval[1] = tree_constant ((double) strlen (string)); |
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368 } |
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369 else |
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370 retval = new tree_constant[2]; |
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371 |
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372 retval[0] = tree_constant (string); |
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373 |
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374 return retval; |
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375 } |
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376 |
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377 tree_constant * |
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378 fopen_internal (tree_constant *args) |
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379 { |
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380 tree_constant *retval = NULL_TREE_CONST; |
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381 Pix p; |
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382 |
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383 if (! args[1].is_string_type ()) |
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384 { |
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385 error ("fopen: file name must be a string"); |
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386 return retval; |
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387 } |
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388 |
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389 p = return_valid_file (args[1]); |
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390 |
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391 if (p != (Pix) NULL) |
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392 { |
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393 File_info file = file_list (p); |
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394 |
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395 retval = new tree_constant[2]; |
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396 retval[0] = tree_constant ((double) file.number ()); |
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397 |
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398 return retval; |
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399 } |
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400 |
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401 if (! args[2].is_string_type ()) |
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402 { |
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403 error ("fopen: mode must be a string"); |
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404 return retval; |
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405 } |
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406 |
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407 char *name = args[1].string_value (); |
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408 char *mode = args[2].string_value (); |
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409 |
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410 if (! valid_mode (mode)) |
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411 { |
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412 error ("fopen: invalid mode"); |
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413 return retval; |
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414 } |
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415 |
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416 struct stat buffer; |
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417 if (stat (name, &buffer) == 0 && (buffer.st_mode & S_IFDIR) == S_IFDIR) |
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418 { |
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419 error ("fopen: can't open directory"); |
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420 return retval; |
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421 } |
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422 |
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423 FILE *file_ptr = fopen (name, mode); |
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424 |
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425 if (file_ptr == (FILE *) NULL) |
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426 { |
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427 error ("fopen: file does not exist"); |
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428 return retval; |
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429 } |
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430 |
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431 int number = file_count++; |
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432 |
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433 File_info file (number, name, file_ptr, mode); |
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434 file_list.append (file); |
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435 |
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436 retval = new tree_constant[2]; |
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437 retval[0] = tree_constant ((double) number); |
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438 |
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439 return retval; |
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440 } |
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441 |
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442 tree_constant * |
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443 freport_internal () |
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444 { |
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445 tree_constant *retval = NULL_TREE_CONST; |
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446 Pix p = file_list.first (); |
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447 |
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448 ostrstream output_buf; |
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449 |
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450 output_buf << "\n number mode name\n\n"; |
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451 for (int i = 0; i < file_count; i++) |
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452 { |
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453 File_info file = file_list (p); |
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454 output_buf.form ("%7d%6s %s\n", file.number (), file.mode (), |
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455 file.name ()); |
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456 file_list.next (p); |
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457 } |
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458 |
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459 output_buf << "\n" << ends; |
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460 maybe_page_output (output_buf); |
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461 |
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462 return retval; |
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463 } |
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464 |
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465 tree_constant * |
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466 frewind_internal (tree_constant *args) |
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467 { |
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468 tree_constant *retval = NULL_TREE_CONST; |
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469 |
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470 Pix p = return_valid_file (args[1]); |
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471 if (p == (Pix) NULL) |
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472 p = fopen_file_for_user (args[1], "a+"); |
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473 |
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474 File_info file = file_list (p); |
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475 rewind (file.fptr ()); |
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476 |
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477 return retval; |
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478 } |
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479 |
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480 tree_constant * |
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481 fseek_internal (tree_constant *args, int nargin) |
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482 { |
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483 tree_constant *retval = NULL_TREE_CONST; |
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484 |
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485 Pix p = return_valid_file (args[1]); |
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486 |
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487 if (p == (Pix) NULL) |
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488 p = fopen_file_for_user (args[1], "a+"); |
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489 |
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490 long origin = SEEK_SET; |
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491 long offset = 0; |
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492 if (args[2].is_scalar_type ()) |
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493 { |
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494 offset = (long) args[2].double_value (); |
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495 if ((double) NINT (offset) != offset) |
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496 { |
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497 error ("fseek: offset not an integer value"); |
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498 return retval; |
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499 } |
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500 } |
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501 |
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502 if (nargin == 4 && args[3].is_scalar_type ()) |
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503 { |
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504 origin = (long) args[3].double_value (); |
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505 if (origin == -1) |
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506 origin = SEEK_CUR; |
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507 else if (origin == -2) |
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508 origin = SEEK_END; |
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509 else |
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510 { |
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511 if ((double) NINT (origin) != origin) |
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512 { |
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513 error ("fseek: origin not an integer value"); |
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514 return retval; |
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515 } |
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516 } |
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517 } |
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518 |
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519 File_info file = file_list (p); |
|
|
520 int success = fseek (file.fptr (), offset, origin); |
|
|
521 retval = new tree_constant[2]; |
|
|
522 |
|
|
523 if (success == 0) |
|
|
524 retval[0] = tree_constant (1.0); // succeeded |
|
|
525 else |
|
|
526 { |
|
|
527 error ("fseek: file error"); |
|
|
528 retval[0] = tree_constant (0.0); // failed |
|
|
529 } |
|
|
530 |
|
|
531 return retval; |
|
|
532 } |
|
|
533 |
|
|
534 tree_constant * |
|
|
535 ftell_internal (tree_constant *args) |
|
|
536 { |
|
|
537 tree_constant *retval = NULL_TREE_CONST; |
|
|
538 Pix p = return_valid_file (args[1]); |
|
|
539 |
|
|
540 if (p == (Pix) NULL) |
|
|
541 p = fopen_file_for_user (args[1], "a+"); |
|
|
542 |
|
|
543 File_info file = file_list (p); |
|
|
544 long offset = ftell (file.fptr ()); |
|
|
545 retval = new tree_constant[2]; |
|
|
546 retval[0] = tree_constant ((double) offset); |
|
|
547 |
|
|
548 if (offset == -1L) |
|
|
549 error ("ftell: write error"); |
|
|
550 |
|
|
551 return retval; |
|
|
552 } |
|
|
553 |
|
|
554 void |
|
|
555 close_files () |
|
|
556 { |
|
|
557 Pix p = file_list.first (); |
|
|
558 |
|
|
559 for (int i = 0; i < file_count; i++) |
|
|
560 { |
|
|
561 File_info file = file_list (p); |
|
|
562 if (i > 2) // do not close stdin, stdout, stderr! |
|
|
563 { |
|
|
564 int success = fclose (file.fptr ()); |
|
|
565 if (success != 0) |
|
|
566 error ("closing %s", file.name ()); |
|
|
567 } |
|
|
568 file_list.del (p); |
|
|
569 } |
|
|
570 } |
|
|
571 |
|
|
572 static int |
|
|
573 process_printf_format (char *s, tree_constant *args, ostrstream& sb, |
|
|
574 char *type, int nargin) |
|
|
575 { |
|
|
576 ostrstream fmt; |
|
|
577 |
|
|
578 fmt << "%"; // do_printf() already blew past this one... |
|
|
579 |
|
|
580 tree_constant_rep::constant_type arg_type; |
|
|
581 |
|
|
582 int chars_from_fmt_str = 0; |
|
|
583 |
|
|
584 again: |
|
|
585 switch (*s) |
|
|
586 { |
|
|
587 case '+': case '-': case ' ': case '0': case '#': |
|
|
588 chars_from_fmt_str++; |
|
|
589 fmt << *s++; |
|
|
590 goto again; |
|
|
591 |
|
|
592 case '\0': |
|
|
593 goto invalid_format; |
|
|
594 |
|
|
595 default: |
|
|
596 break; |
|
|
597 } |
|
|
598 |
|
|
599 if (*s == '*') |
|
|
600 { |
|
|
601 if (fmt_arg_count >= nargin) |
|
|
602 { |
|
|
603 message (type, "not enough arguments"); |
|
|
604 return -1; |
|
|
605 } |
|
|
606 |
|
|
607 if (args[fmt_arg_count].const_type () |
|
|
608 != tree_constant_rep::scalar_constant) |
|
|
609 { |
|
|
610 message (type, "`*' must be replaced by an integer"); |
|
|
611 return -1; |
|
|
612 } |
|
|
613 |
|
|
614 fmt << (int) (args[fmt_arg_count++].double_value ()); |
|
|
615 s++; |
|
|
616 chars_from_fmt_str++; |
|
|
617 } |
|
|
618 else |
|
|
619 { |
|
|
620 while (*s != '\0' && isdigit (*s)) |
|
|
621 { |
|
|
622 chars_from_fmt_str++; |
|
|
623 fmt << *s++; |
|
|
624 } |
|
|
625 } |
|
|
626 |
|
|
627 if (*s == '\0') |
|
|
628 goto invalid_format; |
|
|
629 |
|
|
630 if (*s == '.') |
|
|
631 { |
|
|
632 chars_from_fmt_str++; |
|
|
633 fmt << *s++; |
|
|
634 } |
|
|
635 |
|
|
636 if (*s == '*') |
|
|
637 { |
|
|
638 if (*(s-1) == '*') |
|
|
639 goto invalid_format; |
|
|
640 |
|
|
641 if (fmt_arg_count >= nargin) |
|
|
642 { |
|
|
643 message (type, "not enough arguments"); |
|
|
644 return -1; |
|
|
645 } |
|
|
646 |
|
|
647 if (args[fmt_arg_count].const_type () |
|
|
648 != tree_constant_rep::scalar_constant) |
|
|
649 { |
|
|
650 message (type, "`*' must be replaced by an integer"); |
|
|
651 return -1; |
|
|
652 } |
|
|
653 |
|
|
654 fmt << (int) (args[fmt_arg_count++].double_value ()); |
|
|
655 s++; |
|
|
656 chars_from_fmt_str++; |
|
|
657 } |
|
|
658 else |
|
|
659 { |
|
|
660 while (*s != '\0' && isdigit (*s)) |
|
|
661 { |
|
|
662 chars_from_fmt_str++; |
|
|
663 fmt << *s++; |
|
|
664 } |
|
|
665 } |
|
|
666 |
|
|
667 if (*s == '\0') |
|
|
668 goto invalid_format; |
|
|
669 |
|
|
670 if (*s != '\0' && (*s == 'h' || *s == 'l' || *s == 'L')) |
|
|
671 { |
|
|
672 chars_from_fmt_str++; |
|
|
673 fmt << *s++; |
|
|
674 } |
|
|
675 |
|
|
676 if (*s == '\0') |
|
|
677 goto invalid_format; |
|
|
678 |
|
|
679 if (fmt_arg_count >= nargin) |
|
|
680 { |
|
|
681 message (type, "not enough arguments"); |
|
|
682 return -1; |
|
|
683 } |
|
|
684 |
|
|
685 arg_type = args[fmt_arg_count].const_type (); |
|
|
686 |
|
|
687 switch (*s) |
|
|
688 { |
|
|
689 case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': |
|
|
690 |
|
|
691 if (arg_type != tree_constant_rep::scalar_constant) |
|
|
692 goto invalid_conversion; |
|
|
693 else |
|
|
694 { |
|
|
695 chars_from_fmt_str++; |
|
|
696 fmt << *s << ends; |
|
|
697 double d = args[fmt_arg_count++].double_value (); |
|
|
698 if ((int) d != d) |
|
|
699 goto invalid_conversion; |
|
|
700 else |
|
|
701 { |
|
|
702 char *s = fmt.str (); |
|
|
703 sb.form (s, (int) d); |
|
|
704 delete [] s; |
|
|
705 return chars_from_fmt_str; |
|
|
706 } |
|
|
707 } |
|
|
708 |
|
|
709 case 'e': case 'E': case 'f': case 'g': case 'G': |
|
|
710 |
|
|
711 if (arg_type != tree_constant_rep::scalar_constant) |
|
|
712 goto invalid_conversion; |
|
|
713 else |
|
|
714 { |
|
|
715 chars_from_fmt_str++; |
|
|
716 fmt << *s << ends; |
|
|
717 char *s = fmt.str (); |
|
|
718 sb.form (s, args[fmt_arg_count++].double_value ()); |
|
|
719 delete [] s; |
|
|
720 return chars_from_fmt_str; |
|
|
721 } |
|
|
722 |
|
|
723 case 's': |
|
|
724 |
|
|
725 if (arg_type != tree_constant_rep::string_constant) |
|
|
726 goto invalid_conversion; |
|
|
727 else |
|
|
728 { |
|
|
729 chars_from_fmt_str++; |
|
|
730 fmt << *s << ends; |
|
|
731 char *s = fmt.str (); |
|
|
732 sb.form (s, args[fmt_arg_count++].string_value ()); |
|
|
733 delete [] s; |
|
|
734 return chars_from_fmt_str; |
|
|
735 } |
|
|
736 |
|
|
737 case 'c': |
|
|
738 |
|
|
739 if (arg_type != tree_constant_rep::string_constant) |
|
|
740 goto invalid_conversion; |
|
|
741 else |
|
|
742 { |
|
|
743 chars_from_fmt_str++; |
|
|
744 fmt << *s << ends; |
|
|
745 char *str = args[fmt_arg_count++].string_value (); |
|
|
746 if (strlen (str) != 1) |
|
|
747 goto invalid_conversion; |
|
|
748 else |
|
|
749 { |
|
|
750 char *s = fmt.str (); |
|
|
751 sb.form (s, *str); |
|
|
752 delete [] s; |
|
|
753 return chars_from_fmt_str; |
|
|
754 } |
|
|
755 } |
|
|
756 |
|
|
757 default: |
|
|
758 goto invalid_format; |
|
|
759 } |
|
|
760 |
|
|
761 invalid_conversion: |
|
|
762 message (type, "invalid conversion"); |
|
|
763 return -1; |
|
|
764 |
|
|
765 invalid_format: |
|
|
766 message (type, "invalid format"); |
|
|
767 return -1; |
|
|
768 } |
|
|
769 |
|
|
770 |
|
|
771 tree_constant * |
|
|
772 do_printf (char *type, tree_constant *args, int nargin, int nargout) |
|
|
773 { |
|
|
774 tree_constant *retval = NULL_TREE_CONST; |
|
|
775 fmt_arg_count = 1; |
|
|
776 char *fmt; |
|
|
777 File_info file; |
|
|
778 |
|
|
779 if (strcmp (type, "fprintf") == 0) |
|
|
780 { |
|
|
781 Pix p; |
|
|
782 |
|
|
783 if (args[2].is_string_type ()) |
|
|
784 { |
|
|
785 fmt = args[2].string_value (); |
|
|
786 fmt_arg_count++; |
|
|
787 } |
|
|
788 else |
|
|
789 { |
|
|
790 error ("%s: format must be a string", type); |
|
|
791 return retval; |
|
|
792 } |
|
|
793 |
|
|
794 if (args[1].is_scalar_type ()) |
|
|
795 { |
|
|
796 p = return_valid_file (args[1]); |
|
|
797 if (p == (Pix) NULL) |
|
|
798 return retval; |
|
|
799 } |
|
|
800 else if (args[1].is_string_type ()) |
|
|
801 { |
|
|
802 p = return_valid_file (args[1]); |
|
|
803 if (p == (Pix) NULL) |
|
|
804 p = fopen_file_for_user (args[1], "a+"); |
|
|
805 } |
|
|
806 else |
|
|
807 { |
|
|
808 error ("%s: illegal file specifier", type); |
|
|
809 return retval; |
|
|
810 } |
|
|
811 |
|
|
812 file = file_list (p); |
|
|
813 if (file.mode () == "r") |
|
|
814 { |
|
|
815 error ("%s: file is read only", type); |
|
|
816 return retval; |
|
|
817 } |
|
|
818 fmt = args[2].string_value (); |
|
|
819 fmt_arg_count++; |
|
|
820 } |
|
|
821 else if (args[1].is_string_type ()) |
|
|
822 { |
|
|
823 fmt = args[1].string_value (); |
|
|
824 fmt_arg_count++; |
|
|
825 } |
|
|
826 else |
|
|
827 { |
|
|
828 error ("%s: invalid format string", type); |
|
|
829 return retval; |
|
|
830 } |
|
|
831 |
|
|
832 // Scan fmt for % escapes and print out the arguments. |
|
|
833 |
|
|
834 ostrstream output_buf; |
|
|
835 |
|
|
836 char *ptr = fmt; |
|
|
837 |
|
|
838 for (;;) |
|
|
839 { |
|
|
840 char c; |
|
|
841 while ((c = *ptr++) != '\0' && c != '%') |
|
|
842 output_buf << c; |
|
|
843 |
|
|
844 if (c == '\0') |
|
|
845 break; |
|
|
846 |
|
|
847 if (*ptr == '%') |
|
|
848 { |
|
|
849 ptr++; |
|
|
850 output_buf << c; |
|
|
851 continue; |
|
|
852 } |
|
|
853 |
|
|
854 // We must be looking at a format specifier. Extract it or fail. |
|
|
855 |
|
|
856 |
|
|
857 int status = process_printf_format (ptr, args, output_buf, type, |
|
|
858 nargin); |
|
|
859 |
|
|
860 if (status < 0) |
|
|
861 return retval; |
|
|
862 |
|
|
863 ptr += status; |
|
|
864 } |
|
|
865 |
|
|
866 output_buf << ends; |
|
|
867 if (strcmp (type, "printf") == 0 |
|
|
868 || (strcmp (type, "fprintf") == 0 && file.number () == 1)) |
|
|
869 { |
|
|
870 maybe_page_output (output_buf); |
|
|
871 } |
|
|
872 else if (strcmp (type, "fprintf") == 0) |
|
|
873 { |
|
|
874 char *msg = output_buf.str (); |
|
|
875 int success = fputs (msg, file.fptr ()); |
|
|
876 if (success == EOF) |
|
|
877 error ("%s: writing to file", type); |
|
|
878 delete [] msg; |
|
|
879 } |
|
|
880 else if (strcmp (type, "sprintf") == 0) |
|
|
881 { |
|
|
882 retval = new tree_constant [2]; |
|
|
883 char *msg = output_buf.str (); |
|
|
884 retval[0] = tree_constant (msg); |
|
|
885 delete [] msg; |
|
|
886 } |
|
|
887 |
|
|
888 return retval; |
|
|
889 } |
|
|
890 |
|
|
891 static int |
|
|
892 process_scanf_format (char *s, tree_constant *args, ostrstream& fmt, |
|
|
893 char *type, int nargout, FILE* fptr, |
|
|
894 tree_constant *values) |
|
|
895 { |
|
|
896 fmt << "%"; |
|
|
897 |
|
|
898 tree_constant_rep::constant_type arg_type; |
|
|
899 |
|
|
900 int chars_from_fmt_str = 0; |
|
|
901 int store_value = 1; |
|
|
902 int string_width = -1; |
|
|
903 int success = 1; |
|
|
904 |
|
|
905 if (*s == '*') |
|
|
906 { |
|
|
907 store_value = 0; |
|
|
908 s++; |
|
|
909 chars_from_fmt_str++; |
|
|
910 } |
|
|
911 |
|
|
912 if (isdigit (*s)) |
|
|
913 { |
|
|
914 ostrstream str_number; |
|
|
915 while (*s != '\0' && isdigit (*s)) |
|
|
916 { |
|
|
917 chars_from_fmt_str++; |
|
|
918 str_number << *s; |
|
|
919 fmt << *s++; |
|
|
920 } |
|
|
921 str_number << ends; |
|
|
922 char *number = str_number.str (); |
|
|
923 string_width = atoi (number); |
|
|
924 delete [] number; |
|
|
925 } |
|
|
926 |
|
|
927 if (*s == '\0') |
|
|
928 goto invalid_format; |
|
|
929 |
|
|
930 if (*s != '\0' && (*s == 'h' || *s == 'l' || *s == 'L')) |
|
|
931 { |
|
|
932 chars_from_fmt_str++; |
|
|
933 s++; |
|
|
934 } |
|
|
935 |
|
|
936 if (*s == '\0') |
|
|
937 goto invalid_format; |
|
|
938 |
|
|
939 if (fmt_arg_count >= nargout && store_value) |
|
|
940 { |
|
|
941 message (type, "not enough arguments"); |
|
|
942 return -1; |
|
|
943 } |
|
|
944 |
|
|
945 arg_type = args[fmt_arg_count].const_type (); |
|
|
946 |
|
|
947 switch (*s) |
|
|
948 { |
|
|
949 case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': |
|
|
950 { |
|
|
951 chars_from_fmt_str++; |
|
|
952 fmt << *s << ends; |
|
|
953 int temp; |
|
|
954 char *str = fmt.str (); |
|
|
955 success = fscanf (fptr, str, &temp); |
|
|
956 delete [] str; |
|
|
957 if (success > 0 && store_value) |
|
|
958 values[fmt_arg_count++] = tree_constant ((double) temp); |
|
|
959 } |
|
|
960 break; |
|
|
961 case 'e': case 'E': case 'f': case 'g': case 'G': |
|
|
962 { |
|
|
963 chars_from_fmt_str++; |
|
|
964 fmt << 'l' << *s << ends; |
|
|
965 double temp; |
|
|
966 char *str = fmt.str (); |
|
|
967 success = fscanf (fptr, str, &temp); |
|
|
968 delete [] str; |
|
|
969 if (success > 0 && store_value) |
|
|
970 values[fmt_arg_count++] = tree_constant (temp); |
|
|
971 } |
|
|
972 break; |
|
|
973 case 's': |
|
|
974 { |
|
|
975 if (string_width < 1) |
|
|
976 { |
|
|
977 string_width = 0; |
|
|
978 long original_position = ftell (fptr); |
|
|
979 int c; |
|
|
980 |
|
|
981 while ((c = getc (fptr)) != EOF |
|
|
982 && (c == ' ' || c == '\n' || c != '\t')) |
|
|
983 ; // Don't count leading whitespace. |
|
|
984 |
|
|
985 if (c != EOF) |
|
|
986 string_width++; |
|
|
987 |
|
|
988 for (;;) |
|
|
989 { |
|
|
990 c = getc (fptr); |
|
|
991 if (c != EOF && c != ' ' && c != '\n' && c != '\t') |
|
|
992 string_width++; |
|
|
993 else |
|
|
994 break; |
|
|
995 } |
|
|
996 |
|
|
997 fseek (fptr, original_position, SEEK_SET); |
|
|
998 } |
|
|
999 chars_from_fmt_str++; |
|
|
1000 char temp[string_width+1]; |
|
|
1001 fmt << *s << ends; |
|
|
1002 char *str = fmt.str (); |
|
|
1003 success = fscanf (fptr, str, temp); |
|
|
1004 delete [] str; |
|
|
1005 if (success && store_value) |
|
|
1006 values[fmt_arg_count++] = tree_constant (temp); |
|
|
1007 } |
|
|
1008 break; |
|
|
1009 case 'c': |
|
|
1010 { |
|
|
1011 if (string_width < 1) |
|
|
1012 string_width = 1; |
|
|
1013 chars_from_fmt_str++; |
|
|
1014 char temp[string_width+1]; |
|
|
1015 memset (temp, '\0', string_width+1); |
|
|
1016 fmt << *s << ends; |
|
|
1017 char *str = fmt.str (); |
|
|
1018 success = fscanf (fptr, str, temp); |
|
|
1019 delete [] str; |
|
|
1020 temp[string_width] = '\0'; |
|
|
1021 if (success > 0 && store_value) |
|
|
1022 values[fmt_arg_count++] = tree_constant (temp); |
|
|
1023 } |
|
|
1024 break; |
|
|
1025 default: |
|
|
1026 goto invalid_format; |
|
|
1027 } |
|
|
1028 |
|
|
1029 if (success > 0 || (success == 0 && store_value == 0)) |
|
|
1030 return chars_from_fmt_str; |
|
|
1031 |
|
|
1032 if (success == 0) |
|
|
1033 message (type, "invalid conversion"); |
|
|
1034 else if (success == EOF) |
|
|
1035 { |
|
|
1036 if (strcmp (type, "fscanf") == 0) |
|
|
1037 message (type, "end of file reached before final conversion"); |
|
|
1038 else if (strcmp (type, "sscanf") == 0) |
|
|
1039 message (type, "end of string reached before final conversion"); |
|
|
1040 else if (strcmp (type, "scanf") == 0) |
|
|
1041 message (type, "end of input reached before final conversion"); |
|
|
1042 } |
|
|
1043 else |
|
|
1044 { |
|
|
1045 invalid_format: |
|
|
1046 message (type, "invalid format"); |
|
|
1047 } |
|
|
1048 |
|
|
1049 return -1; |
|
|
1050 } |
|
|
1051 |
|
|
1052 tree_constant * |
|
|
1053 do_scanf (char *type, tree_constant *args, int nargin, int nargout) |
|
|
1054 { |
|
|
1055 tree_constant *retval = NULL_TREE_CONST; |
|
|
1056 char *scanf_fmt = (char *) NULL; |
|
|
1057 char *tmp_file = (char *) NULL; |
|
|
1058 int tmp_file_open = 0; |
|
|
1059 FILE *fptr = (FILE *) NULL; |
|
|
1060 File_info file; |
|
|
1061 |
|
|
1062 fmt_arg_count = 0; |
|
|
1063 |
|
|
1064 if (strcmp (type, "scanf") != 0) |
|
|
1065 { |
|
|
1066 if ( args[2].is_string_type ()) |
|
|
1067 scanf_fmt = args[2].string_value (); |
|
|
1068 else |
|
|
1069 { |
|
|
1070 error ("%s: format must be a string", type); |
|
|
1071 return retval; |
|
|
1072 } |
|
|
1073 } |
|
|
1074 |
|
|
1075 int doing_fscanf = (strcmp (type, "fscanf") == 0); |
|
|
1076 |
|
|
1077 if (doing_fscanf) |
|
|
1078 { |
|
|
1079 Pix p; |
|
|
1080 if (args[1].is_scalar_type () |
|
|
1081 || args[1].is_string_type ()) |
|
|
1082 { |
|
|
1083 p = return_valid_file (args[1]); |
|
|
1084 if (p == (Pix) NULL) |
|
|
1085 return retval; |
|
|
1086 } |
|
|
1087 else |
|
|
1088 { |
|
|
1089 error ("%s: illegal file specifier", type); |
|
|
1090 return retval; |
|
|
1091 } |
|
|
1092 |
|
|
1093 file = file_list (p); |
|
|
1094 |
|
|
1095 if (strcmp (file.mode (), "w") == 0 || strcmp (file.mode (), "a") == 0) |
|
|
1096 { |
|
|
1097 error ("%s: this file is opened for writing only", type); |
|
|
1098 return retval; |
|
|
1099 } |
|
|
1100 |
|
|
1101 fptr = file.fptr (); |
|
|
1102 } |
|
|
1103 |
|
|
1104 if (args[1].is_string_type () || (doing_fscanf && file.number () == 0)) |
|
|
1105 { |
|
|
1106 char *string; |
|
|
1107 |
|
|
1108 if (strcmp (type, "scanf") == 0) |
|
|
1109 scanf_fmt = args[1].string_value (); |
|
|
1110 |
|
|
1111 if (strcmp (type, "scanf") == 0 |
|
|
1112 || (doing_fscanf && file.number () == 0)) |
|
|
1113 { |
|
|
1114 string = gnu_readline (""); |
|
|
1115 if (string && *string) |
|
|
1116 maybe_save_history (string); |
|
|
1117 } |
|
|
1118 else |
|
|
1119 string = args[1].string_value (); |
|
|
1120 |
|
|
1121 tmp_file = tmpnam ((char *) NULL); |
|
|
1122 |
|
|
1123 fptr = fopen (tmp_file, "w+"); |
|
|
1124 if (fptr == (FILE *) NULL) |
|
|
1125 { |
|
|
1126 error ("%s: error opening temporary file", type); |
|
|
1127 return retval; |
|
|
1128 } |
|
|
1129 tmp_file_open = 1; |
|
|
1130 unlink (tmp_file); |
|
|
1131 |
|
|
1132 if (string == (char *) NULL) |
|
|
1133 panic_impossible (); |
|
|
1134 |
|
|
1135 int success = fputs (string, fptr); |
|
|
1136 fflush (fptr); |
|
|
1137 rewind (fptr); |
|
|
1138 |
|
|
1139 if (success < 0) |
|
|
1140 { |
|
|
1141 error ("%s: trouble writing temporary file", type); |
|
|
1142 fclose (fptr); |
|
|
1143 return retval; |
|
|
1144 } |
|
|
1145 } |
|
|
1146 else if (! doing_fscanf) |
|
|
1147 { |
|
|
1148 error ("%s: first argument must be a string", type); |
|
|
1149 return retval; |
|
|
1150 } |
|
|
1151 |
|
|
1152 // Scan scanf_fmt for % escapes and assign the arguments. |
|
|
1153 |
|
|
1154 retval = new tree_constant[nargout+1]; |
|
|
1155 |
|
|
1156 char *ptr = scanf_fmt; |
|
|
1157 |
|
|
1158 for (;;) |
|
|
1159 { |
|
|
1160 ostrstream fmt; |
|
|
1161 char c; |
|
|
1162 while ((c = *ptr++) != '\0' && c != '%') |
|
|
1163 fmt << c; |
|
|
1164 |
|
|
1165 if (c == '\0') |
|
|
1166 break; |
|
|
1167 |
|
|
1168 if (*ptr == '%') |
|
|
1169 { |
|
|
1170 ptr++; |
|
|
1171 fmt << c; |
|
|
1172 continue; |
|
|
1173 } |
|
|
1174 |
|
|
1175 // We must be looking at a format specifier. Extract it or fail. |
|
|
1176 |
|
|
1177 int status = process_scanf_format (ptr, args, fmt, type, |
|
|
1178 nargout, fptr, retval); |
|
|
1179 |
|
|
1180 if (status < 0) |
|
|
1181 { |
|
|
1182 if (fmt_arg_count == 0) |
|
|
1183 { |
|
|
1184 delete [] retval; |
|
|
1185 retval = NULL_TREE_CONST; |
|
|
1186 } |
|
|
1187 break; |
|
|
1188 } |
|
|
1189 |
|
|
1190 ptr += status; |
|
|
1191 } |
|
|
1192 |
|
|
1193 if (tmp_file_open) |
|
|
1194 fclose (fptr); |
|
|
1195 |
|
|
1196 return retval; |
|
|
1197 } |
|
|
1198 |
|
|
1199 /* |
|
|
1200 ;;; Local Variables: *** |
|
|
1201 ;;; mode: C++ *** |
|
|
1202 ;;; page-delimiter: "^/\\*" *** |
|
|
1203 ;;; End: *** |
|
|
1204 */ |
