feat: libfmt prototype added from plan9

1 files changed, 26 insertions, 0 deletions

diff --git a/sys/libfmt/vnsprint.c b/sys/libfmt/vnsprint.c
new file mode 100644
index 0000000..7ded908
--- /dev/null
+++ b/sys/libfmt/vnsprint.c
@@ -0,0 +1,26 @@
+#include "internal.h"
+
+int
+fmt·vnsprint(int len, char *buf, char *fmt, va_list args)
+{
+    fmt·State io;
+
+    if(len <= 0)
+        return -1;
+
+    io.n = 0;
+    io.buffer.beg = io.buffer.cur = buf;
+    io.buffer.end = buf+len-1;
+    io.flush = nil;
+    io.file  = nil;
+
+    va_copy(io.args, args);
+
+    fmt·setlocale(&io, nil, nil, nil);
+    fmt·do(&io, fmt);
+
+    va_end(io.args);
+
+    *(io.buffer.cur) = 0;
+    return io.buffer.cur - io.buffer.beg;
+}