fix integer overflow in WIFSTOPPED macro

[musl] / src / stdio / __stdio_read.c

diff --git a/src/stdio/__stdio_read.c b/src/stdio/__stdio_read.c
index f8fa6d3..ea675da 100644 (file)
--- a/src/stdio/__stdio_read.c
+++ b/src/stdio/__stdio_read.c
@@ -9,10 +9,11 @@ size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
        };
        ssize_t cnt;
 
-       cnt = syscall(SYS_readv, f->fd, iov, 2);
+       cnt = iov[0].iov_len ? syscall(SYS_readv, f->fd, iov, 2)
+               : syscall(SYS_read, f->fd, iov[1].iov_base, iov[1].iov_len);
        if (cnt <= 0) {
-               f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
-               return cnt;
+               f->flags |= cnt ? F_ERR : F_EOF;
+               return 0;
        }
        if (cnt <= iov[0].iov_len) return cnt;
        cnt -= iov[0].iov_len;