DJ Delorie
25 years ago
4 changed files with 181 additions and 147 deletions
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/* Utility to pick a temporary filename prefix.
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Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc. |
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This file is part of the libiberty library. |
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Libiberty is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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Libiberty is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public |
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License along with libiberty; see the file COPYING.LIB. If not, |
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. */ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include <stdio.h> /* May get P_tmpdir. */ |
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#include <sys/types.h> |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#ifdef HAVE_STDLIB_H |
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#include <stdlib.h> |
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#endif |
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#ifdef HAVE_STRING_H |
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#include <string.h> |
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#endif |
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#ifdef HAVE_SYS_FILE_H |
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#include <sys/file.h> /* May get R_OK, etc. on some systems. */ |
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#endif |
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#ifndef R_OK |
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#define R_OK 4 |
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#define W_OK 2 |
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#define X_OK 1 |
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#endif |
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#include "libiberty.h" |
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extern int mkstemps PARAMS ((char *, int)); |
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/* '/' works just fine on MS-DOS based systems. */ |
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#ifndef DIR_SEPARATOR |
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#define DIR_SEPARATOR '/' |
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#endif |
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/* Name of temporary file.
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mktemp requires 6 trailing X's. */ |
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#define TEMP_FILE "ccXXXXXX" |
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#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1) |
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/* Subroutine of choose_tmpdir.
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If BASE is non-NULL, return it. |
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Otherwise it checks if DIR is a usable directory. |
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If success, DIR is returned. |
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Otherwise NULL is returned. */ |
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static const char *try PARAMS ((const char *, const char *)); |
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static const char * |
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try (dir, base) |
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const char *dir, *base; |
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{ |
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if (base != 0) |
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return base; |
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if (dir != 0 |
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&& access (dir, R_OK | W_OK | X_OK) == 0) |
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return dir; |
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return 0; |
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} |
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static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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static const char usrtmp[] = |
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{ DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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static const char vartmp[] = |
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{ DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
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static char *memoized_tmpdir; |
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char * |
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choose_tmpdir () |
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{ |
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const char *base = 0; |
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char *tmpdir; |
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unsigned int len; |
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if (memoized_tmpdir) |
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return memoized_tmpdir; |
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base = try (getenv ("TMPDIR"), base); |
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base = try (getenv ("TMP"), base); |
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base = try (getenv ("TEMP"), base); |
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#ifdef P_tmpdir |
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base = try (P_tmpdir, base); |
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#endif |
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/* Try /var/tmp, /usr/tmp, then /tmp. */ |
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base = try (vartmp, base); |
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base = try (usrtmp, base); |
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base = try (tmp, base); |
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/* If all else fails, use the current directory! */ |
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if (base == 0) |
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base = "."; |
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/* Append DIR_SEPARATOR to the directory we've chosen
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and return it. */ |
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len = strlen (base); |
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tmpdir = xmalloc (len + 2); |
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strcpy (tmpdir, base); |
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tmpdir[len] = DIR_SEPARATOR; |
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tmpdir[len+1] = '\0'; |
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memoized_tmpdir = tmpdir; |
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return tmpdir; |
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} |
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/* Return a temporary file name (as a string) or NULL if unable to create
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one. SUFFIX is a suffix to append to the file name. The string is |
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malloced, and the temporary file has been created. */ |
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char * |
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make_temp_file (suffix) |
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const char *suffix; |
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{ |
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const char *base = choose_tmpdir (); |
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char *temp_filename; |
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int base_len, suffix_len; |
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int fd; |
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if (suffix == 0) |
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suffix = ""; |
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base_len = strlen (base); |
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suffix_len = strlen (suffix); |
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temp_filename = xmalloc (base_len |
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+ TEMP_FILE_LEN |
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+ suffix_len + 1); |
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strcpy (temp_filename, base); |
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strcpy (temp_filename + base_len, TEMP_FILE); |
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strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); |
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fd = mkstemps (temp_filename, suffix_len); |
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/* If mkstemps failed, then something bad is happening. Maybe we should
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issue a message about a possible security attack in progress? */ |
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if (fd == -1) |
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abort (); |
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/* Similarly if we can not close the file. */ |
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if (close (fd)) |
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abort (); |
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return temp_filename; |
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} |
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