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POSIX mandates that swab do nothing when len < 0

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PR:		kern/140690
Submitted by:	Jeremy Huddleston <jeremyhu@apple.com>
Approved by:	cperciva
MFC after:	2 weeks
This commit is contained in:
Eitan Adler 2012-03-04 16:39:08 +00:00
parent c0f0c9848e
commit 0a0c8e010d
2 changed files with 6 additions and 1 deletions
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5
lib/libc/string/swab.3
View file

@ -28,7 +28,7 @@
.\" @(#)swab.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd December 10, 2004
.Dd March 4, 2012
.Dt SWAB 3
.Os
.Sh NAME
@ -54,6 +54,9 @@ swapping adjacent bytes.
The argument
.Fa len
must be an even number.
If
.Fa len
is less than zero, nothing will be done.
.Sh SEE ALSO
.Xr bzero 3 ,
.Xr memset 3

2
lib/libc/string/swab.c
View file

@ -45,6 +45,8 @@ swab(const void * __restrict from, void * __restrict to, ssize_t len)
int n;
char *fp, *tp;
if (len <= 0)
return;
n = len >> 1;
fp = (char *)from;
tp = (char *)to;