diff options
| -rw-r--r-- | src/stdio/fseek.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c index 439308f7..c07f7e95 100644 --- a/src/stdio/fseek.c +++ b/src/stdio/fseek.c @@ -1,7 +1,14 @@ #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 && f->rend) off -= f->rend - f->rpos; |