#include "stdio_impl.h"
+#include <errno.h>
int __fseeko_unlocked(FILE *f, off_t off, int whence)
{
+ /* Fail immediately for invalid whence argument. */
+ if (whence != SEEK_CUR && whence != SEEK_SET && whence != SEEK_END) {
+ errno = EINVAL;
+ return -1;
+ }
+
/* Adjust relative offset for unread data in buffer, if any. */
- if (whence == SEEK_CUR) off -= f->rend - f->rpos;
+ if (whence == SEEK_CUR && f->rend) off -= f->rend - f->rpos;
/* Flush write buffer, and report error on failure. */
- if (f->wpos > f->wbase) {
+ if (f->wpos != f->wbase) {
f->write(f, 0, 0);
if (!f->wpos) return -1;
}
f->wpos = f->wbase = f->wend = 0;
/* Perform the underlying seek. */
- if (f->seek(f, off, whence) < 0) {
- f->flags |= F_ERR;
- return -1;
- }
+ if (f->seek(f, off, whence) < 0) return -1;
/* If seek succeeded, file is seekable and we discard read buffer. */
f->rpos = f->rend = 0;
}
weak_alias(__fseeko, fseeko);
-
-LFS64(fseeko);