X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=ipif%2Fservice.c;h=7821a463cf84ecbab4d776e829ba8690e1639852;hb=345c35a6361f9fb30cb4a2f613ec3ff392a0d8be;hp=b401a5cb39dd76a21d451548a91c87a90eacd398;hpb=4f937f540734e6f5977b9c279f8f24035a259310;p=userv-utils.git

diff --git a/ipif/service.c b/ipif/service.c
index b401a5c..7821a46 100644
--- a/ipif/service.c
+++ b/ipif/service.c
@@ -329,13 +329,17 @@ static char *eat_optionalstr(const char **argp,
 			     const char *def) {
   ptrdiff_t len;
   const char *start= *argp;
-  const char *comma= strchr(start, ',');
-  if (comma) {
-    len= comma - start;
-    *argp= comma + 1;
+  if (!start) {
+    len = 0;
   } else {
-    len= strlen(start);
-    *argp= start + len;
+    const char *comma= strchr(start, ',');
+    if (comma) {
+      len= comma - start;
+      *argp= comma + 1;
+    } else {
+      len= strlen(start);
+      *argp= start + len;
+    }
   }
   if (!len) {
     start= def;