1#include "stdio_impl.h"
2#include <limits.h>
3#include <errno.h>
4
5off_t __ftello_unlocked(FILE *f)
6{
7 off_t pos = f->seek(f, 0,
8 (f->flags & F_APP) && f->wpos != f->wbase
9 ? SEEK_END : SEEK_CUR);
10 if (pos < 0) return pos;
11
12 /* Adjust for data in buffer. */
13 if (f->rend)
14 pos += f->rpos - f->rend;
15 else if (f->wbase)
16 pos += f->wpos - f->wbase;
17 return pos;
18}
19
20off_t __ftello(FILE *f)
21{
22 off_t pos;
23 FLOCK(f);
24 pos = __ftello_unlocked(f);
25 FUNLOCK(f);
26 return pos;
27}
28
29long ftell(FILE *f)
30{
31 off_t pos = __ftello(f);
32 if (pos > LONG_MAX) {
33 errno = EOVERFLOW;
34 return -1;
35 }
36 return pos;
37}
38
39weak_alias(__ftello, ftello);
40
41weak_alias(ftello, ftello64);