1#include "stdio_impl.h"
2
3int __fseeko_unlocked(FILE *f, off_t off, int whence)
4{
5	/* Adjust relative offset for unread data in buffer, if any. */
6	if (whence == SEEK_CUR) off -= f->rend - f->rpos;
7
8	/* Flush write buffer, and report error on failure. */
9	if (f->wpos > f->wbase) {
10		f->write(f, 0, 0);
11		if (!f->wpos) return -1;
12	}
13
14	/* Leave writing mode */
15	f->wpos = f->wbase = f->wend = 0;
16
17	/* Perform the underlying seek. */
18	if (f->seek(f, off, whence) < 0) return -1;
19
20	/* If seek succeeded, file is seekable and we discard read buffer. */
21	f->rpos = f->rend = 0;
22	f->flags &= ~F_EOF;
23
24	return 0;
25}
26
27int __fseeko(FILE *f, off_t off, int whence)
28{
29	int result;
30	FLOCK(f);
31	result = __fseeko_unlocked(f, off, whence);
32	FUNLOCK(f);
33	return result;
34}
35
36int fseek(FILE *f, long off, int whence)
37{
38	return __fseeko(f, off, whence);
39}
40
41weak_alias(__fseeko, fseeko);
42
43LFS64(fseeko);
44