148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/* Utility to pick a temporary filename prefix.
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Copyright (C) 1996 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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/* This file exports one function: choose_temp_base. */
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/* This file lives in at least two places: libiberty and gcc.
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Don't change one without the other. */
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#ifndef NO_SYS_FILE_H
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#include <sys/types.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 <stdio.h> /* May get P_tmpdir. */
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#ifdef IN_GCC
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#include "config.h"
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#include "gansidecl.h"
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extern char *xmalloc ();
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#else
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#include "ansidecl.h"
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#include "libiberty.h"
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#if defined (__MSDOS__) || defined (_WIN32)
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#define DIR_SEPARATOR '\\'
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#endif
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#endif
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#ifndef DIR_SEPARATOR
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#define DIR_SEPARATOR '/'
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#endif
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/* On MSDOS, write temp files in current dir
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because there's no place else we can expect to use. */
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/* ??? Although the current directory is tried as a last resort,
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this is left in so that on MSDOS it is prefered to /tmp on the
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off chance that someone requires this, since that was the previous
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behaviour. */
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#ifdef __MSDOS__
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#ifndef P_tmpdir
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#define P_tmpdir "."
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#endif
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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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/* Subroutine of choose_temp_base.
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If BASE is non-NULL, returh 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 char *
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try (dir, base)
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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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/* Return a prefix for temporary file names or NULL if unable to find one.
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The current directory is chosen if all else fails so the program is
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exited if a temporary directory can't be found (mktemp fails).
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The buffer for the result is obtained with xmalloc. */
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char *
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choose_temp_base ()
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{
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char *base = 0;
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char *temp_filename;
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int len;
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static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
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static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
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#ifndef MPW
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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 /usr/tmp, then /tmp. */
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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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#ifdef VMS
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base = "[";
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#else
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base = ".";
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#endif
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#else /* MPW */
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base = ":";
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#endif
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len = strlen (base);
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temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
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+ strlen (TEMP_FILE) + 1);
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strcpy (temp_filename, base);
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#ifndef MPW
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if (len != 0
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&& temp_filename[len-1] != '/'
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&& temp_filename[len-1] != DIR_SEPARATOR)
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temp_filename[len++] = DIR_SEPARATOR;
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#else /* MPW */
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if (temp_filename[len-1] != ':')
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temp_filename[len++] = ':';
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#endif /* MPW */
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strcpy (temp_filename + len, TEMP_FILE);
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mktemp (temp_filename);
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if (strlen (temp_filename) == 0)
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abort ();
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return temp_filename;
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}
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