1 files changed, 26 insertions, 0 deletions
diff --git a/sys/libfmt/vwrite.c b/sys/libfmt/vwrite.c
new file mode 100644
index 0000000..cacdef2
--- /dev/null
+++ b/sys/libfmt/vwrite.c
@@ -0,0 +1,26 @@
+#include "internal.h"
+
+int
+fmt·vwrite(fmt·State *io, char *fmt, va_list args)
+{
+    int n;
+    va_list tmp;
+
+    io->flag = io->width = io->prec = 0;
+
+    va_copy(tmp, io->args);
+    va_end(io->args);
+
+    va_copy(io->args,args);
+    n = fmt·do(io, fmt);
+    va_end(io->args);
+
+    va_copy(io->args, tmp);
+    va_end(tmp);
+
+    io->flag = io->width = io->prec = 0;
+
+    if(n >= 0)
+        return 0;
+    return n;
+}