Differential D12785 Diff 41046 head/lib/libc/stdio/gets_s.c

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head/lib/libc/stdio/gets_s.c

Property	Old Value	New Value
svn:keywords	null	FreeBSD=%H \ No newline at end of property

				/*-
				* 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. 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 <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);
				}