From e47158fd9023eec4dd5e852f33f327901a5a6632 Mon Sep 17 00:00:00 2001
From: corvid <corvid@lavabit.com>
Date: Tue, 28 Jul 2009 16:32:27 +0000
Subject: dStristr check for NULL args

---
 dlib/dlib.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

(limited to 'dlib')

diff --git a/dlib/dlib.c b/dlib/dlib.c
index d5383903..b87d0ce1 100644
--- a/dlib/dlib.c
+++ b/dlib/dlib.c
@@ -169,18 +169,20 @@ char *dStrsep(char **orig, const char *delim)
 char *dStristr(const char *haystack, const char *needle)
 {
    int i, j;
-
-   for (i = 0, j = 0; haystack[i] && needle[j]; ++i)
-      if (tolower(haystack[i]) == tolower(needle[j])) {
-         ++j;
-      } else if (j) {
-         i -= j;
-         j = 0;
-      }
-
-   if (!needle[j])                 /* Got all */
-      return (char *)(haystack + i - j);
-   return NULL;
+   char *ret = NULL;
+
+   if (haystack && needle) {
+      for (i = 0, j = 0; haystack[i] && needle[j]; ++i)
+         if (tolower(haystack[i]) == tolower(needle[j])) {
+            ++j;
+         } else if (j) {
+            i -= j;
+            j = 0;
+         }
+      if (!needle[j])                 /* Got all */
+         ret = (char *)(haystack + i - j);
+   }
+   return ret;
 }
 
 
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