1 files changed, 23 insertions, 0 deletions
diff --git a/src/libstddjb/vbaprintf.c b/src/libstddjb/vbaprintf.c
new file mode 100644
index 0000000..efc2bd1
--- /dev/null
+++ b/src/libstddjb/vbaprintf.c
@@ -0,0 +1,23 @@
+/* ISC license. */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/bufalloc.h>
+#include <skalibs/lolstdio.h>
+
+int vbaprintf (bufalloc *ba, char const *format, va_list args)
+{
+  int r ;
+  {
+    va_list ugly ;
+    va_copy(ugly, args) ;
+    r = vsnprintf(0, 0, format, ugly) ;
+    va_end(ugly) ;
+  }
+  if (r < 0) return r ;
+  if (!stralloc_readyplus(&ba->x, (unsigned int)r + 1)) return -1 ;
+  r = vsnprintf(ba->x.s + ba->x.len, (unsigned int)r + 1, format, args) ;
+  if (r > 0) ba->x.len += r ;
+  return r ;
+}