Style and micro-optimizations in JSON parsing.

src/nxt_conf_json.c

@@ -279,11 +279,13 @@ nxt_conf_json_parse_object(u_char *pos, u_char *end,
     nxt_lvlhsh_t                *object;
     nxt_conf_json_obj_member_t  *member;
 
-    object = nxt_mem_zalloc(pool, sizeof(nxt_lvlhsh_t));
+    object = nxt_mem_alloc(pool, sizeof(nxt_lvlhsh_t));
     if (nxt_slow_path(object == NULL)) {
         return NULL;
     }
 
+    nxt_lvlhsh_init(object);
+
     value->type = NXT_CONF_JSON_OBJECT;
     value->u.object = object;
 
@@ -471,11 +473,11 @@ nxt_conf_json_parse_string(u_char *pos, u_char *end,
             case '"':
             case '\\':
             case '/':
-            case 'b':
-            case 'f':
             case 'n':
             case 'r':
             case 't':
+            case 'b':
+            case 'f':
                 surplus++;
                 state = sw_usual;
                 continue;
@@ -558,14 +560,6 @@ nxt_conf_json_parse_string(u_char *pos, u_char *end,
             *s++ = ch;
             continue;
 
-        case 'b':
-            *s++ = '\b';
-            continue;
-
-        case 'f':
-            *s++ = '\f';
-            continue;
-
         case 'n':
             *s++ = '\n';
             continue;
@@ -577,6 +571,14 @@ nxt_conf_json_parse_string(u_char *pos, u_char *end,
         case 't':
             *s++ = '\t';
             continue;
+
+        case 'b':
+            *s++ = '\b';
+            continue;
+
+        case 'f':
+            *s++ = '\f';
+            continue;
         }
 
         utf = 0;