kc3-lang/gnulib/lib/tmpdir.c

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• Hash : 99099106
  Author :
  Date : 2006-09-14T14:18:36
  

  Include <config.h> unconditionally.
  

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• lib/tmpdir.c

• /* Copyright (C) 1999, 2001-2002, 2006 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  
  /* Extracted from sysdeps/posix/tempname.c.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "tmpdir.h"
  
  #include <stdbool.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <errno.h>
  #ifndef __set_errno
  # define __set_errno(Val) errno = (Val)
  #endif
  
  #include <stdio.h>
  #ifndef P_tmpdir
  # define P_tmpdir "/tmp"
  #endif
  
  #include <sys/stat.h>
  #if !defined S_ISDIR && defined S_IFDIR
  # define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
  #endif
  #if !S_IRUSR && S_IREAD
  # define S_IRUSR S_IREAD
  #endif
  #if !S_IRUSR
  # define S_IRUSR 00400
  #endif
  #if !S_IWUSR && S_IWRITE
  # define S_IWUSR S_IWRITE
  #endif
  #if !S_IWUSR
  # define S_IWUSR 00200
  #endif
  #if !S_IXUSR && S_IEXEC
  # define S_IXUSR S_IEXEC
  #endif
  #if !S_IXUSR
  # define S_IXUSR 00100
  #endif
  
  #if _LIBC
  # define struct_stat64 struct stat64
  #else
  # define struct_stat64 struct stat
  # define __xstat64(version, path, buf) stat (path, buf)
  #endif
  
  #if ! (HAVE___SECURE_GETENV || _LIBC)
  # define __secure_getenv getenv
  #endif
  
  /* Pathname support.
     ISSLASH(C)           tests whether C is a directory separator character.
   */
  #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
    /* Win32, Cygwin, OS/2, DOS */
  # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  #else
    /* Unix */
  # define ISSLASH(C) ((C) == '/')
  #endif
  
  
  /* Return nonzero if DIR is an existent directory.  */
  static bool
  direxists (const char *dir)
  {
    struct_stat64 buf;
    return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.st_mode);
  }
  
  /* Path search algorithm, for tmpnam, tmpfile, etc.  If DIR is
     non-null and exists, uses it; otherwise uses the first of $TMPDIR,
     P_tmpdir, /tmp that exists.  Copies into TMPL a template suitable
     for use with mk[s]temp.  Will fail (-1) if DIR is non-null and
     doesn't exist, none of the searched dirs exists, or there's not
     enough space in TMPL. */
  int
  path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
  	     bool try_tmpdir)
  {
    const char *d;
    size_t dlen, plen;
  
    if (!pfx || !pfx[0])
      {
        pfx = "file";
        plen = 4;
      }
    else
      {
        plen = strlen (pfx);
        if (plen > 5)
  	plen = 5;
      }
  
    if (try_tmpdir)
      {
        d = __secure_getenv ("TMPDIR");
        if (d != NULL && direxists (d))
  	dir = d;
        else if (dir != NULL && direxists (dir))
  	/* nothing */ ;
        else
  	dir = NULL;
      }
    if (dir == NULL)
      {
        if (direxists (P_tmpdir))
  	dir = P_tmpdir;
        else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
  	dir = "/tmp";
        else
  	{
  	  __set_errno (ENOENT);
  	  return -1;
  	}
      }
  
    dlen = strlen (dir);
    while (dlen >= 1 && ISSLASH (dir[dlen - 1]))
      dlen--;			/* remove trailing slashes */
  
    /* check we have room for "${dir}/${pfx}XXXXXX\0" */
    if (tmpl_len < dlen + 1 + plen + 6 + 1)
      {
        __set_errno (EINVAL);
        return -1;
      }
  
    sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
    return 0;
  }
  

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