[PATCH 3/4] lib: jsmn: add case-insensitive comparison

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Users may want to do a case-insensitive comparison of tokens. Add simple
helpers for that.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 include/jsmn.h |  3 +++
 lib/jsmn.c     | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/jsmn.h b/include/jsmn.h
index 62197c2593b4..64b3b535ab6e 100644
--- a/include/jsmn.h
+++ b/include/jsmn.h
@@ -101,6 +101,9 @@ JSMN_API bool jsmn_str_eq(const char *str, const char *json, const jsmntok_t *to
 /** Returns `true` if `token` is to `str`. */
 JSMN_API bool jsmn_eq(const char *val, const char *json, const jsmntok_t *token);
 
+/** Returns `true` if `token` is equal to `str`, ignoring case. */
+JSMN_API bool jsmn_strcase_eq(const char *str, const char *json, const jsmntok_t *token);
+
 /** Returns the token after the value at `tokens[0]`. */
 JSMN_API const jsmntok_t *jsmn_skip_value(const jsmntok_t *tokens);
 
diff --git a/lib/jsmn.c b/lib/jsmn.c
index 3d2ada7b7fdc..9e624f7518ad 100644
--- a/lib/jsmn.c
+++ b/lib/jsmn.c
@@ -418,6 +418,18 @@ JSMN_API bool jsmn_str_eq(const char *str, const char *json, const jsmntok_t *to
 	return token->type == JSMN_STRING && jsmn_eq(str, json, token);
 }
 
+static bool jsmn_case_eq(const char *val, const char *json, const jsmntok_t *token)
+{
+	size_t token_size = jsmn_token_size(token);
+	return strlen(val) == token_size
+		&& strncasecmp(json + token->start, val, token_size) == 0;
+}
+
+JSMN_API bool jsmn_strcase_eq(const char *str, const char *json, const jsmntok_t *token)
+{
+	return token->type == JSMN_STRING && jsmn_case_eq(str, json, token);
+}
+
 JSMN_API const jsmntok_t *jsmn_skip_value(const jsmntok_t *tokens)
 {
 	int max_index = tokens[0].end;
-- 
2.39.2