From a1a97eb11e89c420b84a659a88a4e72c7f04367d Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 11 Sep 2011 11:40:22 +0200
Subject: [PATCH] jshn: support using characters in elements that do not
 conform to shell variable restrictions

---
 jshn.c     | 15 ++++++++++-----
 sh/jshn.sh |  8 ++++++--
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/jshn.c b/jshn.c
index 88e31d1..f7a46de 100644
--- a/jshn.c
+++ b/jshn.c
@@ -150,14 +150,19 @@ static char *get_keys(const char *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(strlen(prefix) + 1 + strlen(name) + 1 + sizeof("TYPE_"));
-	sprintf(tmpname, "TYPE_%s_%s", prefix, name);
+	tmpname = alloca(strlen(prefix) + 1 + strlen(*name) + 1 + sizeof("TYPE_"));
+	sprintf(tmpname, "TYPE_%s_%s", prefix, *name);
 	*var = getenv(tmpname + 5);
 	*type = getenv(tmpname);
+
+	memcpy(tmpname, "NAME", 4);
+	varname = getenv(tmpname);
+	if (varname)
+		*name = varname;
 }
 
 static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array);
@@ -167,7 +172,7 @@ 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;
 
diff --git a/sh/jshn.sh b/sh/jshn.sh
index 7389f8c..8ecefcf 100644
--- a/sh/jshn.sh
+++ b/sh/jshn.sh
@@ -19,11 +19,15 @@ json_add_generic() {
 	local val="$3"
 	local cur="${4:-$JSON_CUR}"
 
-	[ "${cur%%[0-9]*}" = "JSON_ARRAY" ] && {
+	if [ "${cur%%[0-9]*}" = "JSON_ARRAY" ]; then
 		eval "local aseq=\"\${SEQ_$cur}\""
 		var=$(( ${aseq:-0} + 1 ))
 		export -- "SEQ_$cur=$var"
-	}
+	else
+		local name="$(echo -n "$var" | tr -C '[a-zA-Z_]' _)"
+		[[ "$name" == "$var" ]] || export -- "NAME_${cur}_${name}=$var"
+		var="$name"
+	fi
 
 	export -- "${cur}_$var=$val"
 	export -- "TYPE_${cur}_$var=$type"