Libc-1272.200.26.tar.gz

[apple/libc.git] / libdarwin / stdio.c

diff --git a/libdarwin/stdio.c b/libdarwin/stdio.c
new file mode 100644 (file)
index 0000000..49bfd85
--- /dev/null
+++ b/libdarwin/stdio.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+#include "internal.h"
+
+#pragma mark API
+size_t
+zsnprintf_np(char *buff, size_t len, const char *fmt, ...)
+{
+       int np = 0;
+       va_list ap;
+
+       va_start(ap, fmt);
+       np = vsnprintf(buff, len, fmt, ap);
+       va_end(ap);
+
+       if (np < 0) {
+               np = 0;
+       } else if ((size_t)np >= len) {
+               np = (int)len - 1;
+       }
+
+       return (size_t)np;
+}