[syslinux:pathbased] qsort: handle the case of zero entries

[syslinux-bot for H. Peter Anvin]

Commit-ID:  600217eb7036a64630a3edd6b093d97b883a9b5c
Gitweb:     http://syslinux.zytor.com/commit/600217eb7036a64630a3edd6b093d97b883a9b5c
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Sat, 6 Mar 2010 14:49:10 -0800
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Sat, 6 Mar 2010 14:49:10 -0800

qsort: handle the case of zero entries

Avoid bugs when the qsorted array is empty.

Signed-off-by: H. Peter Anvin <hpa at zytor.com>


---
 com32/lib/qsort.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/com32/lib/qsort.c b/com32/lib/qsort.c
index a67866d..a9d646c 100644
--- a/com32/lib/qsort.c
+++ b/com32/lib/qsort.c
@@ -6,6 +6,7 @@
  */
 
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 
 static inline size_t newgap(size_t gap)
@@ -27,6 +28,9 @@ void qsort(void *base, size_t nmemb, size_t size,
     char *p1, *p2;
     int swapped;
 
+    if (!nmemb)
+	return;
+
     do {
 	gap = newgap(gap);
 	swapped = 0;