getutline.c revision 22347 
1/* getutline.c: A replacement for the getutline() 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
14#include "opie_cfg.h"
15#include <stdio.h>
16#include <utmp.h>
17#include "opie.h"
18
19static struct utmp u;
20
21struct utmp *getutline FUNCTION((utmp), struct utmp *utmp)
22{
23  FILE *f;
24  int i;
25
26  if (!(f = __opieopen(_PATH_UTMP, 0, 0644)))
27    return 0;
28
29#if HAVE_TTYSLOT
30  if (i = ttyslot()) {
31    if (fseek(f, i * sizeof(struct utmp), SEEK_SET) < 0)
32      goto ret;
33    if (fread(&u, sizeof(struct utmp), 1, f) != sizeof(struct utmp))
34      goto ret;
35    fclose(f);
36    return &u;
37  }
38#endif /* HAVE_TTYSLOT */
39
40  while(fread(&u, sizeof(struct utmp), 1, f) == sizeof(struct utmp)) {
41    if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) - 1)) {
42      fclose(f);
43      return &u;
44    }
45  }
46
47ret:
48  fclose(f);
49  return NULL;
50}
51