diff options
Diffstat (limited to 'lib/libc/stdio/fwrite.c')
| -rw-r--r-- | lib/libc/stdio/fwrite.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/libc/stdio/fwrite.c b/lib/libc/stdio/fwrite.c index 8a508dcdba7..a60f9e0807a 100644 --- a/lib/libc/stdio/fwrite.c +++ b/lib/libc/stdio/fwrite.c @@ -1,4 +1,4 @@ -/* $OpenBSD: fwrite.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */ +/* $OpenBSD: fwrite.c,v 1.6 2009/07/12 18:45:21 millert Exp $ */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. @@ -46,8 +46,14 @@ fwrite(const void *buf, size_t size, size_t count, FILE *fp) struct __suio uio; struct __siov iov; + /* + * ANSI and SUSv2 require a return value of 0 if size or count are 0. + */ + if ((n = count * size) == 0) + return (0); + iov.iov_base = (void *)buf; - uio.uio_resid = iov.iov_len = n = count * size; + uio.uio_resid = iov.iov_len = n; uio.uio_iov = &iov; uio.uio_iovcnt = 1; |