Function handle_percent

common/json_parse.c:158–196

talfmt take a ctx pointer and return NULL or a valid pointer. * fmt takes the argument, and returns a bool. * * This function returns NULL on success, or errmsg on failure. */

 * This function returns NULL on success, or errmsg on failure.
*/
static const char *handle_percent(const char *buffer,
				  const jsmntok_t *tok,
				  va_list *ap)
{
	void *ctx;
	const char *fmtname;

	/* This is set to (dummy) json_scan if it's a non-tal fmt */
	ctx = va_arg(*ap, void *);
	fmtname = va_arg(*ap, const char *);
	if (ctx != json_scan) {
		void *(*talfmt)(void *, const char *, const jsmntok_t *);
		void **p;
		p = va_arg(*ap, void **);
		talfmt = va_arg(*ap, void *(*)(void *, const char *, const jsmntok_t *));
		/* If we're skipping this, don't call fmt! */
		if (!tok)
			return NULL;
		*p = talfmt(ctx, buffer, tok);
		if (*p != NULL)
			return NULL;
	} else {
		bool (*fmt)(const char *, const jsmntok_t *, void *);
		void *p;

		p = va_arg(*ap, void *);
		fmt = va_arg(*ap, bool (*)(const char *, const jsmntok_t *, void *));
		/* If we're skipping this, don't call fmt! */
		if (!tok)
			return NULL;
		if (fmt(buffer, tok, p))
			return NULL;
	}

	return tal_fmt(tmpctx, "%s could not parse %.*s",
		       fmtname,
		       json_tok_full_len(tok),
		       json_tok_full(buffer, tok));
}

/* GUIDE := OBJ | ARRAY | '%'
 * OBJ := '{' FIELDLIST '}'