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-rw-r--r--lib/libc/stdio/gets_s.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/libc/stdio/gets_s.c b/lib/libc/stdio/gets_s.c
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+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 2017, 2018
+ * Cyril S. E. Schubert
+ *
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <errno.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+
+static inline char *
+_gets_s(char *buf, rsize_t n)
+{
+ int c;
+ char *s;
+
+ ORIENT(stdin, -1);
+ for (s = buf, n--; (c = __sgetc(stdin)) != '\n' && n > 0 ; n--) {
+ if (c == EOF) {
+ if (s == buf) {
+ return (NULL);
+ } else
+ break;
+ } else
+ *s++ = c;
+ }
+
+ /*
+ * If end of buffer reached, discard until \n or eof.
+ * Then throw an error.
+ */
+ if (n == 0) {
+ /* discard */
+ while ((c = __sgetc(stdin)) != '\n' && c != EOF);
+ /* throw the error after lock released prior to exit */
+ __throw_constraint_handler_s("gets_s : end of buffer", E2BIG);
+ return (NULL);
+ }
+ *s = 0;
+ return (buf);
+}
+
+/* ISO/IEC 9899:2011 K.3.7.4.1 */
+char *
+gets_s(char *buf, rsize_t n)
+{
+ char *ret;
+ if (buf == NULL) {
+ __throw_constraint_handler_s("gets_s : str is NULL", EINVAL);
+ return(NULL);
+ } else if (n > RSIZE_MAX) {
+ __throw_constraint_handler_s("gets_s : n > RSIZE_MAX",
+ EINVAL);
+ return(NULL);
+ } else if (n == 0) {
+ __throw_constraint_handler_s("gets_s : n == 0", EINVAL);
+ return(NULL);
+ }
+
+ FLOCKFILE_CANCELSAFE(stdin);
+ ret = _gets_s(buf, n);
+ FUNLOCKFILE_CANCELSAFE();
+ return (ret);
+}