open.c revision 22347 
1/* open.c: The __opieopen() library function.
2
3%%% copyright-cmetz
4This software is Copyright 1996 by Craig Metz, All Rights Reserved.
5The Inner Net License Version 2 applies to this software.
6You should have received a copy of the license with this software. If
7you didn't get a copy, you may request one from <license@inner.net>.
8
9	History:
10
11	Created by cmetz for OPIE 2.3.
12*/
13#include "opie_cfg.h"
14
15#include <stdio.h>
16#include <sys/types.h>
17#if HAVE_UNISTD_H
18#include <unistd.h>
19#endif /* HAVE_UNISTD_H */
20#include <sys/stat.h>
21#include <errno.h>
22
23#include "opie.h"
24
25#if !HAVE_LSTAT
26#define lstat(x, y) stat(x, y)
27#endif /* !HAVE_LSTAT */
28
29FILE *__opieopen FUNCTION((file, rw, mode), char *file AND int rw AND int mode)
30{
31  FILE *f;
32  struct stat st;
33
34  if (lstat(file, &st)) {
35    if (errno != ENOENT)
36      return NULL;
37
38    if (!(f = fopen(file, "w")))
39      return NULL;
40
41    fclose(f);
42
43    if (chmod(file, mode))
44      return NULL;
45
46    if (lstat(file, &st))
47      return NULL;
48  }
49
50  if (!S_ISREG(st.st_mode))
51    return NULL;
52
53  {
54    char *fmodes[] = { "r", "r+", "a" };
55
56    if (!(f = fopen(file, fmodes[rw])))
57      return NULL;
58  }
59
60  return f;
61}
62