utils: add little-endian swap helpers

[project/libubox.git] / jshn.c

diff --git a/jshn.c b/jshn.c
index 88e31d1..9cbdb31 100644 (file)
--- a/jshn.c
+++ b/jshn.c
@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2011-2013 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
 #include <json/json.h>
 #include <string.h>
 #include <stdlib.h>
@@ -9,6 +24,9 @@
 
 #define MAX_VARLEN     256
 
+static const char *var_prefix = "";
+static int var_prefix_len = 0;
+
 static int add_json_element(const char *key, json_object *obj);
 
 static int add_json_object(json_object *obj)
@@ -145,19 +163,27 @@ static char *get_keys(const char *prefix)
 {
        char *keys;
 
-       keys = alloca(strlen(prefix) + sizeof("KEYS_") + 1);
-       sprintf(keys, "KEYS_%s", prefix);
+       keys = alloca(var_prefix_len + strlen(prefix) + sizeof("KEYS_") + 1);
+       sprintf(keys, "%sKEYS_%s", var_prefix, prefix);
        return getenv(keys);
 }
 
-static void get_var(const char *prefix, const char *name, char **var, char **type)
+static void get_var(const char *prefix, const char **name, char **var, char **type)
 {
-       char *tmpname;
+       char *tmpname, *varname;
+
+       tmpname = alloca(var_prefix_len + strlen(prefix) + 1 + strlen(*name) + 1 + sizeof("TYPE_"));
+
+       sprintf(tmpname, "%s%s_%s", var_prefix, prefix, *name);
+       *var = getenv(tmpname);
 
-       tmpname = alloca(strlen(prefix) + 1 + strlen(name) + 1 + sizeof("TYPE_"));
-       sprintf(tmpname, "TYPE_%s_%s", prefix, name);
-       *var = getenv(tmpname + 5);
+       sprintf(tmpname, "%sTYPE_%s_%s", var_prefix, prefix, *name);
        *type = getenv(tmpname);
+
+       sprintf(tmpname, "%sNAME_%s_%s", var_prefix, prefix, *name);
+       varname = getenv(tmpname);
+       if (varname)
+               *name = varname;
 }
 
 static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array);
@@ -167,7 +193,7 @@ static void jshn_add_object_var(json_object *obj, bool array, const char *prefix
        json_object *new;
        char *var, *type;
 
-       get_var(prefix, name, &var, &type);
+       get_var(prefix, &name, &var, &type);
        if (!var || !type)
                return;
 
@@ -233,8 +259,12 @@ int main(int argc, char **argv)
        bool no_newline = false;
        int ch;
 
-       while ((ch = getopt(argc, argv, "nr:w")) != -1) {
+       while ((ch = getopt(argc, argv, "p:nr:w")) != -1) {
                switch(ch) {
+               case 'p':
+                       var_prefix = optarg;
+                       var_prefix_len = strlen(var_prefix);
+                       break;
                case 'r':
                        return jshn_parse(optarg);
                case 'w':