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| | #include "stdio_impl.h"
#include <limits.h>
#include <errno.h>
off_t __ftello_unlocked(FILE *f)
{
off_t pos = f->seek(f, 0,
(f->flags & F_APP) && f->wpos != f->wbase
? SEEK_END : SEEK_CUR);
if (pos < 0) return pos;
/* Adjust for data in buffer. */
if (f->rend)
pos += f->rpos - f->rend;
else if (f->wbase)
pos += f->wpos - f->wbase;
return pos;
}
off_t __ftello(FILE *f)
{
off_t pos;
FLOCK(f);
pos = __ftello_unlocked(f);
FUNLOCK(f);
return pos;
}
long ftell(FILE *f)
{
off_t pos = __ftello(f);
if (pos > LONG_MAX) {
errno = EOVERFLOW;
return -1;
}
return pos;
}
weak_alias(__ftello, ftello);
|