- fixed bug in list

errormsg.c

@@ -18,9 +18,9 @@ int ErrEqual(char *str1, char *str2) {
       if (str1 == NULL || str2 == NULL) {
         return str1 == str2;
       }
-      str1++;
-      str2++;
     }
+    str1++;
+    str2++;
   }
   return 1;
 }
@@ -45,23 +45,24 @@ ErrMsg *ErrPutMsg(ErrMsg *dump, char *fmt, ...) {
     vsnprintf(text, l, fmt, ap);
     va_end(ap);
   }
-  for (last = &dump; *last != NULL; last = &m->next) {
-    m = *last;
+  last = &dump;
+  for (m = dump; m != NULL; m = m->next) {
     if (ErrEqual(text, m->text)) {
-      *last = m->next;
+      *last = m->next; /* remove found item from the list */
       break;
     }
+    last = &m->next;
   }
-  if (m == NULL) {
+  if (m == NULL) { /* make a fresh list item m */
     if (text == buf) text = strdup(buf);
     m = calloc(1, sizeof(*m));
     m->text = text;
     m->cnt = 1;
-  } else {
+  } else { /* take the found item m */
     if (text != buf) free(text);
     m->cnt++;
   }
-  m->next = dump;
+  m->next = dump; /* add the new item to the head of the list */
   time(&m->last);
   return m;
 }