From: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Date: Fri, 23 Apr 2021 18:15:59 +0000 (-0700)
Subject: topology: pre-processor: Add a helper function to concat strings
X-Git-Tag: v1.2.5~30
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=eb514c6bd7ff669ecad6548885be2545fc02fea5;p=alsa-utils.git

topology: pre-processor: Add a helper function to concat strings

The pre-processor needs to concatinate strings separated
by '.' for building object names from constructor attribute
values and searching for configs with ID's containing strings
separate by '.'. Add a helper function to concat strings in
the specified input format.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/topology/pre-processor.c b/topology/pre-processor.c
index 100c9ad..3d50d8c 100644
--- a/topology/pre-processor.c
+++ b/topology/pre-processor.c
@@ -71,6 +71,33 @@ int tplg_config_make_add(snd_config_t **config, const char *id, snd_config_type_
 	return ret;
 }
 
+/*
+ * The pre-processor will need to concat multiple strings separate by '.' to construct the object
+ * name and search for configs with ID's separated by '.'.
+ * This function helps concat input strings in the specified input format
+ */
+char *tplg_snprintf(char *fmt, ...)
+{
+	char *string;
+	int len = 1;
+
+	va_list va;
+
+	va_start(va, fmt);
+	len += vsnprintf(NULL, 0, fmt, va);
+	va_end(va);
+
+	string = calloc(1, len);
+	if (!string)
+		return NULL;
+
+	va_start(va, fmt);
+	vsnprintf(string, len, fmt, va);
+	va_end(va);
+
+	return string;
+}
+
 #ifdef TPLG_DEBUG
 void tplg_pp_debug(char *fmt, ...)
 {
diff --git a/topology/pre-processor.h b/topology/pre-processor.h
index cac464b..d9f0f3e 100644
--- a/topology/pre-processor.h
+++ b/topology/pre-processor.h
@@ -30,4 +30,6 @@ void tplg_pp_config_debug(struct tplg_pre_processor *tplg_pp, snd_config_t *cfg)
 snd_config_t *tplg_find_config(snd_config_t *config, const char *name);
 int tplg_config_make_add(snd_config_t **config, const char *id, snd_config_type_t type,
 			 snd_config_t *parent);
+
+char *tplg_snprintf(char *fmt, ...);
 #endif