1 files changed, 25 insertions, 0 deletions
diff --git a/src/libstddjb/vbprintf.c b/src/libstddjb/vbprintf.c
new file mode 100644
index 0000000..a6a75f3
--- /dev/null
+++ b/src/libstddjb/vbprintf.c
@@ -0,0 +1,25 @@
+/* ISC license. */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <skalibs/buffer.h>
+#include <skalibs/lolstdio.h>
+
+int vbprintf (buffer *b, 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 ;
+  {
+    char buf[(unsigned int)r + 1] ;
+    r = vsnprintf(buf, (unsigned int)r + 1, format, args) ;
+    if (r < 0) return r ;
+    if (buffer_put(b, buf, r) < r) return -1 ;
+  }
+  return r ;
+}