all printf variants: fix argument type handling for %c and %lc

[musl] / src / stdio / fseek.c

diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c
index 26d9f7e..c742580 100644 (file)
--- a/src/stdio/fseek.c
+++ b/src/stdio/fseek.c
@@ -1,13 +1,19 @@
 #include "stdio_impl.h"
-#include "libc.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;
        }
@@ -40,5 +46,3 @@ int fseek(FILE *f, long off, int whence)
 }
 
 weak_alias(__fseeko, fseeko);
-
-LFS64(fseeko);