stable solution for printing arrays - based on patch donated by Jerome Lang.

Resolves issue in case malloc(0)!=0.



git-svn-id: http://svn.code.sf.net/p/cjson/code@44 e3330c51-1366-4df0-8b21-3ccf24e3d50e

cJSON.c

@@ -327,13 +327,15 @@ static const char *parse_array(cJSON *item,const char *value)
 /* Render an array to text */
 static char *print_array(cJSON *item,int depth,int fmt)
 {
-	char **entries;
+	char **entries=0;
 	char *out=0,*ptr,*ret;int len=5;
 	cJSON *child=item->child;
 	int numentries=0,i=0,fail=0;
 	
 	/* How many entries in the array? */
 	while (child) numentries++,child=child->next;
+	if (numentries)
+	{
 		/* Allocate an array to hold the values for each */
 		entries=(char**)cJSON_malloc(numentries*sizeof(char*));
 		if (!entries) return 0;
@@ -347,6 +349,7 @@ static char *print_array(cJSON *item,int depth,int fmt)
 			if (ret) len+=strlen(ret)+2+(fmt?1:0); else fail=1;
 			child=child->next;
 		}
+	}
 	
 	/* If we didn't fail, try to malloc the output string */
 	if (!fail) out=(char*)cJSON_malloc(len);
@@ -357,7 +360,7 @@ static char *print_array(cJSON *item,int depth,int fmt)
 	if (fail)
 	{
 		for (i=0;i<numentries;i++) if (entries[i]) cJSON_free(entries[i]);
-		cJSON_free(entries);
+		if (entries) cJSON_free(entries);
 		return 0;
 	}
 	
@@ -370,7 +373,7 @@ static char *print_array(cJSON *item,int depth,int fmt)
 		if (i!=numentries-1) {*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;}
 		cJSON_free(entries[i]);
 	}
-	cJSON_free(entries);
+	if (entries) cJSON_free(entries);
 	*ptr++=']';*ptr++=0;
 	return out;	
 }