auto import from //depot/cupcake/@135843
diff --git a/libc/stdio/snprintf.c b/libc/stdio/snprintf.c
new file mode 100644
index 0000000..e830c0f
--- /dev/null
+++ b/libc/stdio/snprintf.c
@@ -0,0 +1,67 @@
+/* $OpenBSD: snprintf.c,v 1.14 2005/10/10 12:00:52 espie Exp $ */
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include "local.h"
+
+int
+snprintf(char *str, size_t n, const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+ char dummy;
+ FILE f;
+ struct __sfileext fext;
+
+ /* While snprintf(3) specifies size_t stdio uses an int internally */
+ if (n > INT_MAX)
+ n = INT_MAX;
+ /* Stdio internals do not deal correctly with zero length buffer */
+ if (n == 0) {
+ str = &dummy;
+ n = 1;
+ }
+ _FILEEXT_SETUP(&f, &fext);
+ f._file = -1;
+ f._flags = __SWR | __SSTR;
+ f._bf._base = f._p = (unsigned char *)str;
+ f._bf._size = f._w = n - 1;
+ va_start(ap, fmt);
+ ret = vfprintf(&f, fmt, ap);
+ va_end(ap);
+ *f._p = '\0';
+ return (ret);
+}