1 files changed, 19 insertions, 0 deletions
diff --git a/src/util.c b/src/util.c
index d87fd72..686f02d 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1,5 +1,6 @@
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "runes.h"
 
@@ -11,3 +12,21 @@ void runes_warn(const char *fmt, ...)
     vfprintf(stderr, fmt, ap);
     va_end(ap);
 }
+
+int sprintf_dup(char **out, const char *fmt, ...)
+{
+    int outlen = 0;
+    va_list ap;
+
+    va_start(ap, fmt);
+    outlen = vsnprintf(*out, outlen, fmt, ap);
+    va_end(ap);
+
+    *out = malloc(outlen + 1);
+
+    va_start(ap, fmt);
+    outlen = vsnprintf(*out, outlen + 1, fmt, ap);
+    va_end(ap);
+
+    return outlen;
+}