select: fix 64-bit timeout truncation on pre-time64 kernels

[musl] / src / stdio / ftell.c

diff --git a/src/stdio/ftell.c b/src/stdio/ftell.c
index 3904a1d..1e1a08d 100644 (file)
--- a/src/stdio/ftell.c
+++ b/src/stdio/ftell.c
@@ -1,12 +1,20 @@
 #include "stdio_impl.h"
+#include <limits.h>
+#include <errno.h>
 
 off_t __ftello_unlocked(FILE *f)
 {
-       off_t pos = f->seek(f, 0, SEEK_CUR);
+       off_t pos = f->seek(f, 0,
+               (f->flags & F_APP) && f->wpos != f->wbase
+               ? SEEK_END : SEEK_CUR);
        if (pos < 0) return pos;
 
        /* Adjust for data in buffer. */
-       return pos - (f->rend - f->rpos) + (f->wpos - f->wbase);
+       if (f->rend)
+               pos += f->rpos - f->rend;
+       else if (f->wbase)
+               pos += f->wpos - f->wbase;
+       return pos;
 }
 
 off_t __ftello(FILE *f)
@@ -29,5 +37,3 @@ long ftell(FILE *f)
 }
 
 weak_alias(__ftello, ftello);
-
-LFS64(ftello);