1 files changed, 34 insertions, 0 deletions
diff --git a/src/base/io/vprint.c b/src/base/io/vprint.c
new file mode 100644
index 0000000..6fa446e
--- /dev/null
+++ b/src/base/io/vprint.c
@@ -0,0 +1,34 @@
+#include "internal.h"
+
+static int
+flush(fmt·State *fmt)
+{
+    io·Header *io = fmt->file;
+    io->olen = fmt->buffer.cur - fmt->buffer.end;
+    if(io·flush(io))
+        return 0;
+
+    fmt->buffer.end = (char*)io->e;
+    fmt->buffer.cur = fmt->buffer.beg = fmt->buffer.end + io->olen;
+    return 1;
+}
+
+int
+io·vprint(io·Header *io, char *fmt, va_list args)
+{
+    int n;
+    fmt·State f;
+
+    f.buffer.end = (char*)io->e;
+    f.buffer.beg = f.buffer.cur = (char*)(io->e + io->olen);
+    f.n     = 0;
+    f.file  = io;
+    f.flush = flush;
+
+    va_copy(f.args,args);
+    n = fmt·do(&f, fmt);
+    va_end(f.args);
+
+    io->olen = f.buffer.cur - f.buffer.beg;
+    return n;
+}