X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fstdio%2Ffseek.c;h=c07f7e952642ba3bef35f4eb8a7865e6a8d1b5dc;hb=d32dadd60efb9d3b255351a3b532f8e4c3dd0db1;hp=26d9f7ef460c0602d32f6f9d4c30b6e7ec3d6148;hpb=5ce3737931bb411a8d167356d4d0287b53b0cbdc;p=musl

diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c
index 26d9f7ef..c07f7e95 100644
--- 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;
 	}
@@ -41,4 +47,4 @@ int fseek(FILE *f, long off, int whence)
 
 weak_alias(__fseeko, fseeko);
 
-LFS64(fseeko);
+weak_alias(fseeko, fseeko64);