1 files changed, 34 insertions, 0 deletions
diff --git a/shared/utils.c b/shared/utils.c
index 9bf8cd8..99fcaa3 100644
--- a/shared/utils.c
+++ b/shared/utils.c
@@ -13,6 +13,7 @@
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
 #include <inttypes.h>
+#include <stdarg.h>
 
 #include "utils.h"
 
@@ -218,3 +219,36 @@ int strtou16_strict(const char *str, uint16_t *result)
 		*result = val;
 	return 0;
 }
+
+char *xsprintf(size_t *rlen, const char *fmt, ...)
+{
+	va_list ap;
+	int len;
+	char *str;
+
+	va_start(ap, fmt);
+	len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+
+	if (len < 0)
+		return NULL;
+
+	len++;
+	str = zmalloc(len);
+	if (!str)
+		return NULL;
+
+	va_start(ap, fmt);
+	len = vsnprintf(str, len, fmt, ap);
+	va_end(ap);
+
+	if (len < 0) {
+		xfree(str);
+		return NULL;
+	}
+
+	if (rlen)
+		*rlen = len;
+
+	return str;
+}