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-rw-r--r--libc/stdio/vswprintf.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/libc/stdio/vswprintf.c b/libc/stdio/vswprintf.c
new file mode 100644
index 000000000..a5839b7bd
--- /dev/null
+++ b/libc/stdio/vswprintf.c
@@ -0,0 +1,70 @@
+/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ *
+ * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
+ */
+
+#include "_stdio.h"
+#include <stdarg.h>
+#include <wchar.h>
+
+#ifndef __STDIO_BUFFERS
+#warning Skipping vswprintf since no buffering!
+#else /* __STDIO_BUFFERS */
+
+int vswprintf(wchar_t *__restrict buf, size_t size,
+ const wchar_t * __restrict format, va_list arg)
+{
+ FILE f;
+ int rv;
+
+/* __STDIO_STREAM_RESET_GCS(&f); */
+#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
+ f.__cookie = &(f.__filedes);
+ f.__gcs.read = NULL;
+ f.__gcs.write = NULL;
+ f.__gcs.seek = NULL;
+ f.__gcs.close = NULL;
+#endif
+
+ f.__filedes = __STDIO_STREAM_FAKE_VSWPRINTF_FILEDES;
+ f.__modeflags = (__FLAG_WIDE|__FLAG_WRITEONLY|__FLAG_WRITING);
+
+ f.__ungot_width[0] = 0;
+#ifdef __STDIO_MBSTATE
+ __INIT_MBSTATE(&(f.__state));
+#endif /* __STDIO_MBSTATE */
+
+#ifdef __UCLIBC_HAS_THREADS__
+ f.__user_locking = 1; /* Set user locking. */
+ __stdio_init_mutex(&f.__lock);
+#endif
+ f.__nextopen = NULL;
+
+ if (size > ((SIZE_MAX - (size_t) buf)/sizeof(wchar_t))) {
+ size = ((SIZE_MAX - (size_t) buf)/sizeof(wchar_t));
+ }
+
+ f.__bufstart = (char *) buf;
+ f.__bufend = (char *)(buf + size);
+ __STDIO_STREAM_INIT_BUFREAD_BUFPOS(&f);
+ __STDIO_STREAM_DISABLE_GETC(&f);
+ __STDIO_STREAM_DISABLE_PUTC(&f);
+
+ rv = vfwprintf(&f, format, arg);
+
+ /* NOTE: Return behaviour differs from snprintf... */
+ if (f.__bufpos == f.__bufend) {
+ rv = -1;
+ if (size) {
+ f.__bufpos = (char *)(((wchar_t *) f.__bufpos) - 1);
+ }
+ }
+ if (size) {
+ *((wchar_t *) f.__bufpos) = 0;
+ }
+ return rv;
+}
+
+#endif /* __STDIO_BUFFERS */