contrib/opie/libopie/open.c

   1 /* open.c: The __opieopen() library function.
   2
   3 %%% copyright-cmetz-96
   4 This software is Copyright 1996-2001 by Craig Metz, All Rights Reserved.
   5 The Inner Net License Version 3 applies to this software.
   6 You should have received a copy of the license with this software. If
   7 you didn't get a copy, you may request one from <license@inner.net>.
   8
   9         History:
  10
  11         Modified by cmetz for OPIE 2.4. More portable way to get the mode
  12                 string for fopen.
  13         Created by cmetz for OPIE 2.3.
  14 */
  15 #include "opie_cfg.h"
  16
  17 #include <stdio.h>
  18 #include <sys/types.h>
  19 #if HAVE_UNISTD_H
  20 #include <unistd.h>
  21 #endif /* HAVE_UNISTD_H */
  22 #include <sys/stat.h>
  23 #include <errno.h>
  24
  25 #include "opie.h"
  26
  27 #if !HAVE_LSTAT
  28 #define lstat(x, y) stat(x, y)
  29 #endif /* !HAVE_LSTAT */
  30
  31 FILE *__opieopen FUNCTION((file, rw, mode), char *file AND int rw AND int mode)
  32 {
  33   FILE *f;
  34   struct stat st;
  35
  36   if (lstat(file, &st)) {
  37     if (errno != ENOENT)
  38       return NULL;
  39
  40     if (!(f = fopen(file, "w")))
  41       return NULL;
  42
  43     fclose(f);
  44
  45     if (chmod(file, mode))
  46       return NULL;
  47
  48     if (lstat(file, &st))
  49       return NULL;
  50   }
  51
  52   if (!S_ISREG(st.st_mode))
  53     return NULL;
  54
  55   {
  56     char *fmode;
  57
  58     switch(rw) {
  59       case 0:
  60         fmode = "r";
  61         break;
  62       case 1:
  63         fmode = "r+";
  64         break;
  65       case 2:
  66         fmode = "a";
  67         break;
  68       default:
  69         return NULL;
  70     };
  71
  72     if (!(f = fopen(file, fmode)))
  73       return NULL;
  74   }
  75
  76   return f;
  77 }