feat: libfmt prototype added from plan9

1 files changed, 34 insertions, 0 deletions

diff --git a/sys/libfmt/open.c b/sys/libfmt/open.c
new file mode 100644
index 0000000..8aadef5
--- /dev/null
+++ b/sys/libfmt/open.c
@@ -0,0 +1,34 @@
+#include "internal.h"
+
+static int
+flush(fmt·State *io)
+{
+    int n, fd;
+
+    fd = (uintptr)io->file;
+    n  = io->buffer.cur - io->buffer.beg;
+    if(n && write(fd, io->buffer.beg, n) != n)
+        return -1;
+
+    io->buffer.cur  = io->buffer.beg;
+    return io->n;
+}
+
+int
+fmt·open(int fd, int len, char *buf, fmt·State *io)
+{
+    io->buffer.beg = buf;
+    io->buffer.cur = buf;
+    io->buffer.end = buf+len;
+    io->flush = flush;
+    io->file  = (void*)(uintptr)fd;
+    io->flag  = 0;
+    io->n     = 0;
+    /* no heap needed */
+    io->heap = nil;
+    io->mem  = (mem·Reallocator){ 0 };
+
+    fmt·setlocale(io, nil, nil, nil);
+
+    return 0;
+}