Add strbuf_reset() to reset string length

Add strbuf_reset() to reset string length and hide the string
implementation.

2 files changed, 8 insertions, 2 deletions

diff --git a/lua_cjson.c b/lua_cjson.c
index df3b71c..39e22ad 100644
--- a/lua_cjson.c
+++ b/lua_cjson.c
@@ -558,7 +558,7 @@ static int json_encode(lua_State *l)
 
     /* Reset persistent encode_buf. Avoids temporary allocation
      * for a single call. */
-    cfg->encode_buf.length = 0;
+    strbuf_reset(&cfg->encode_buf);
     json_append_data(l, cfg, &cfg->encode_buf);
     json = strbuf_string(&cfg->encode_buf, &len);
 
@@ -683,7 +683,7 @@ static void json_next_string_token(json_parse_t *json, json_token_t *token)
 
     /* json->tmp is the temporary strbuf used to accumulate the
      * decoded string value. */
-    json->tmp->length = 0;
+    strbuf_reset(json->tmp);
     while ((ch = json->data[json->index]) != '"') {
         if (!ch) {
             /* Premature end of the string */
diff --git a/strbuf.h b/strbuf.h
index 46fad33..85f3261 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -72,6 +72,12 @@ extern void strbuf_append_number(strbuf_t *s, double number);
 static void strbuf_append_char(strbuf_t *s, const char c);
 static void strbuf_ensure_null(strbuf_t *s);
 
+/* Reset string for before use */
+static inline void strbuf_reset(strbuf_t *s)
+{
+    s->length = 0;
+}
+
 /* Return bytes remaining in the string buffer
  * Ensure there is space for a NULL terminator. */
 static inline int strbuf_empty_length(strbuf_t *s)