Mercurial > hg > octave-nkf
annotate liboctave/tempname.c @ 10317:42d098307c30
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| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Thu, 11 Feb 2010 13:30:42 -0500 |
| parents | 0522a65bcd56 |
| children | 12df7854fa7c |
| rev | line source |
|---|---|
| 828 | 1 /* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc. |
| 2 This file is part of the GNU C Library. | |
| 3 | |
| 4 The GNU C Library is free software; you can redistribute it and/or | |
| 5 modify it under the terms of the GNU General Public License as | |
| 6 published by the Free Software Foundation; either version 2 of the | |
| 7 License, or (at your option) any later version. | |
| 8 | |
| 9 The GNU C Library is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public | |
| 15 License along with the GNU C Library; see the file COPYING. If | |
| 5307 | 16 not, write to the Free Software Foundation, Inc., 51 Franklin Street, |
| 17 Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 828 | 18 |
| 19 #ifdef HAVE_CONFIG_H | |
| 1243 | 20 #include <config.h> |
| 828 | 21 #endif |
| 22 | |
| 23 #ifndef HAVE_TEMPNAM | |
| 24 | |
| 25 #include <errno.h> | |
| 26 #include <stddef.h> | |
| 27 #include <stdio.h> | |
| 28 #include <stdlib.h> | |
| 29 #include <string.h> | |
| 1350 | 30 |
| 31 #include <sys/types.h> | |
| 32 #include <unistd.h> | |
| 33 | |
| 828 | 34 #include <fcntl.h> |
| 35 | |
| 1056 | 36 #include "statdefs.h" |
| 37 | |
| 828 | 38 #ifndef FILENAME_MAX |
| 39 #ifdef MAXPATHLEN | |
| 40 #define FILENAME_MAX MAXPATHLEN | |
| 41 #else | |
| 42 #define FILENAME_MAX 1024 | |
| 43 #endif | |
| 44 #endif | |
| 45 | |
| 46 #ifndef P_tmpdir | |
| 47 #define P_tmpdir "/usr/tmp/" | |
| 48 #endif | |
| 49 | |
| 50 /* Return nonzero if DIR is an existent directory. */ | |
| 51 static int | |
| 52 diraccess (const char *dir) | |
| 53 { | |
| 54 struct stat buf; | |
| 55 return stat (dir, &buf) == 0 && S_ISDIR (buf.st_mode); | |
| 56 } | |
| 57 | |
| 58 /* Return nonzero if FILE exists. */ | |
| 59 static int | |
| 60 exists (const char *file) | |
| 61 { | |
| 62 /* We can stat the file even if we can't read its data. */ | |
| 63 struct stat st; | |
| 64 int save = errno; | |
| 65 if (stat (file, &st) == 0) | |
| 66 return 1; | |
| 67 else | |
| 68 { | |
| 69 /* We report that the file exists if stat failed for a reason other | |
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70 than nonexistence. In this case, it may or may not exist, and we |
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71 don't know; but reporting that it does exist will never cause any |
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72 trouble, while reporting that it doesn't exist when it does would |
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73 violate the interface of __stdio_gen_tempname. */ |
| 828 | 74 int exists = errno != ENOENT; |
| 75 errno = save; | |
| 76 return exists; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 | |
| 81 /* These are the characters used in temporary filenames. */ | |
| 82 static const char letters[] = | |
| 83 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; | |
| 84 | |
| 85 /* Generate a temporary filename and return it (in a static buffer). If | |
| 86 STREAMPTR is not NULL, open a stream "w+b" on the file and set | |
| 87 *STREAMPTR to it. If DIR_SEARCH is nonzero, DIR and PFX are used as | |
| 88 described for tempnam. If not, a temporary filename in P_tmpdir with no | |
| 89 special prefix is generated. If LENPTR is not NULL, *LENPTR is set the | |
| 90 to length (including the terminating '\0') of the resultant filename, | |
| 91 which is returned. This goes through a cyclic pattern of all possible | |
| 92 filenames consisting of five decimal digits of the current pid and three | |
| 93 of the characters in `letters'. Data for tempnam and tmpnam is kept | |
| 94 separate, but when tempnam is using P_tmpdir and no prefix (i.e, it is | |
| 95 identical to tmpnam), the same data is used. Each potential filename is | |
| 96 tested for an already-existing file of the same name, and no name of an | |
| 97 existing file will be returned. When the cycle reaches its end | |
| 98 (12345ZZZ), NULL is returned. */ | |
| 99 char * | |
| 100 __stdio_gen_tempname (const char *dir, const char *pfx, | |
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101 int dir_search, size_t *lenptr, |
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102 FILE **streamptr) |
| 828 | 103 { |
| 104 int saverrno = errno; | |
| 105 static const char tmpdir[] = P_tmpdir; | |
| 106 static size_t indices[2]; | |
| 107 size_t *idx; | |
| 108 static char buf[FILENAME_MAX]; | |
| 109 static pid_t oldpid = (pid_t) 0; | |
| 110 pid_t pid = getpid(); | |
| 111 register size_t len, plen, dlen; | |
| 112 | |
| 113 if (dir_search) | |
| 114 { | |
| 115 register const char *d = getenv("TMPDIR"); | |
| 116 if (d != NULL && !diraccess(d)) | |
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117 d = NULL; |
| 828 | 118 if (d == NULL && dir != NULL && diraccess(dir)) |
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119 d = dir; |
| 828 | 120 if (d == NULL && diraccess(tmpdir)) |
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121 d = tmpdir; |
| 828 | 122 if (d == NULL && diraccess("/tmp")) |
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123 d = "/tmp"; |
| 828 | 124 if (d == NULL) |
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125 { |
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126 errno = ENOENT; |
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127 return NULL; |
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128 } |
| 828 | 129 dir = d; |
| 130 } | |
| 131 else | |
| 132 dir = tmpdir; | |
| 133 | |
| 134 dlen = strlen (dir); | |
| 135 | |
| 136 /* Remove trailing slashes from the directory name. */ | |
| 137 while (dlen > 1 && dir[dlen - 1] == '/') | |
| 138 --dlen; | |
| 139 | |
| 140 if (pfx != NULL && *pfx != '\0') | |
| 141 { | |
| 142 plen = strlen(pfx); | |
| 143 if (plen > 5) | |
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144 plen = 5; |
| 828 | 145 } |
| 146 else | |
| 147 plen = 0; | |
| 148 | |
| 149 if (dir != tmpdir && !strcmp(dir, tmpdir)) | |
| 150 dir = tmpdir; | |
| 151 idx = &indices[(plen == 0 && dir == tmpdir) ? 1 : 0]; | |
| 152 | |
| 153 if (pid != oldpid) | |
| 154 { | |
| 155 oldpid = pid; | |
| 156 indices[0] = indices[1] = 0; | |
| 157 } | |
| 158 | |
| 159 len = dlen + 1 + plen + 5 + 3; | |
| 160 for (; *idx < ((sizeof (letters) - 1) * (sizeof (letters) - 1) * | |
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161 (sizeof (letters) - 1)); |
| 828 | 162 ++*idx) |
| 163 { | |
| 164 /* Construct a file name and see if it already exists. | |
| 165 | |
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166 We use a single counter in *IDX to cycle each of three |
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167 character positions through each of 62 possible letters. */ |
| 828 | 168 |
| 169 if (sizeof (buf) < len) | |
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170 return NULL; |
| 828 | 171 |
| 172 sprintf (buf, "%.*s/%.*s%.5d%c%c%c", | |
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173 (int) dlen, dir, (int) plen, |
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174 pfx, pid % 100000, |
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175 letters[*idx |
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176 % (sizeof (letters) - 1)], |
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177 letters[(*idx / (sizeof (letters) - 1)) |
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178 % (sizeof (letters) - 1)], |
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179 letters[(*idx / ((sizeof (letters) - 1) * |
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180 (sizeof (letters) - 1))) |
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181 % (sizeof (letters) - 1)] |
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182 ); |
| 828 | 183 |
| 184 if (! buf || strlen (buf) != (int) len) | |
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185 return NULL; |
| 828 | 186 |
| 187 if (streamptr != NULL) | |
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188 abort (); |
| 828 | 189 else if (exists (buf)) |
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190 continue; |
| 828 | 191 |
| 192 /* If the file already existed we have continued the loop above, | |
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193 so we only get here when we have a winning name to return. */ |
| 828 | 194 |
| 195 errno = saverrno; | |
| 196 | |
| 197 if (lenptr != NULL) | |
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198 *lenptr = len + 1; |
| 828 | 199 return buf; |
| 200 } | |
| 201 | |
| 202 /* We got out of the loop because we ran out of combinations to try. */ | |
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203 errno = EEXIST; /* ? */ |
| 828 | 204 return NULL; |
| 205 } | |
| 206 | |
| 207 #endif |