get_strlen: Add APIs to get the length of a JSON string value

json_obj_get_strlen and json_arr_get_strlen added

Signed-off-by: Piyush Shah <[email protected]>

Author: shahpiyushv

include/json_parser.h

@@ -31,6 +31,7 @@ int json_obj_get_int(jparse_ctx_t *jctx, char *name, int *val);
 int json_obj_get_int64(jparse_ctx_t *jctx, char *name, int64_t *val);
 int json_obj_get_float(jparse_ctx_t *jctx, char *name, float *val);
 int json_obj_get_string(jparse_ctx_t *jctx, char *name, char *val, int size);
+int json_obj_get_strlen(jparse_ctx_t *jctx, char *name, int *strlen);
 
 int json_arr_get_array(jparse_ctx_t *jctx, uint32_t index);
 int json_arr_leave_array(jparse_ctx_t *jctx);
@@ -41,5 +42,6 @@ int json_arr_get_int(jparse_ctx_t *jctx, uint32_t index, int *val);
 int json_arr_get_int64(jparse_ctx_t *jctx, uint32_t index, int64_t *val);
 int json_arr_get_float(jparse_ctx_t *jctx, uint32_t index, float *val);
 int json_arr_get_string(jparse_ctx_t *jctx, uint32_t index, char *val, int size);
+int json_arr_get_strlen(jparse_ctx_t *jctx, uint32_t index, int *strlen);
 
 #endif /* _JSON_PARSER_H_ */

src/json_parser.c

@@ -199,6 +199,15 @@ int json_obj_get_string(jparse_ctx_t *jctx, char *name, char *val, int size)
 	return json_tok_to_string(jctx, tok, val, size);
 }
 
+int json_obj_get_strlen(jparse_ctx_t *jctx, char *name, int *strlen)
+{
+	json_tok_t *tok = json_obj_get_val_tok(jctx, name, JSMN_STRING);
+	if (!tok)
+		return -OS_FAIL;
+	*strlen = tok->end - tok->start + 1;
+	return OS_SUCCESS;
+}
+
 static json_tok_t *json_arr_search(jparse_ctx_t *ctx, uint32_t index)
 {
 	json_tok_t *tok = ctx->cur;
@@ -298,6 +307,15 @@ int json_arr_get_string(jparse_ctx_t *jctx, uint32_t index, char *val, int size)
 	return json_tok_to_string(jctx, tok, val, size);
 }
 
+int json_arr_get_strlen(jparse_ctx_t *jctx, uint32_t index, int *strlen)
+{
+	json_tok_t *tok = json_arr_get_val_tok(jctx, index, JSMN_STRING);
+	if (!tok)
+		return -OS_FAIL;
+	*strlen = tok->end - tok->start + 1;
+	return OS_SUCCESS;
+}
+
 int json_parse_start(jparse_ctx_t *jctx, char *js, int len)
 {
 	memset(jctx, 0, sizeof(jparse_ctx_t));