93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* Checking gets.
|
|
Copyright (C) 2005-2017 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
#include "config.h"
|
|
#include <ssp/ssp.h>
|
|
#include <stdarg.h>
|
|
#ifdef HAVE_STDLIB_H
|
|
# include <stdlib.h>
|
|
#endif
|
|
#ifdef HAVE_ALLOCA_H
|
|
# include <alloca.h>
|
|
#endif
|
|
#ifdef HAVE_LIMITS_H
|
|
# include <limits.h>
|
|
#endif
|
|
#ifdef HAVE_STDIO_H
|
|
# include <stdio.h>
|
|
#endif
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
|
|
#if !(!defined __USE_ISOC11 \
|
|
|| (defined __cplusplus && __cplusplus <= 201103L))
|
|
extern char *gets (char *);
|
|
#endif
|
|
|
|
extern void __chk_fail (void) __attribute__((__noreturn__));
|
|
|
|
char *
|
|
__gets_chk (char *s, size_t slen)
|
|
{
|
|
char *ret, *buf;
|
|
|
|
if (slen >= (size_t) INT_MAX)
|
|
return gets (s);
|
|
|
|
if (slen <= 8192)
|
|
buf = alloca (slen + 1);
|
|
else
|
|
buf = malloc (slen + 1);
|
|
if (buf == NULL)
|
|
return gets (s);
|
|
|
|
ret = fgets (buf, (int) (slen + 1), stdin);
|
|
if (ret != NULL)
|
|
{
|
|
size_t len = strlen (buf);
|
|
if (len > 0 && buf[len - 1] == '\n')
|
|
--len;
|
|
if (len == slen)
|
|
__chk_fail ();
|
|
memcpy (s, buf, len);
|
|
s[len] = '\0';
|
|
ret = s;
|
|
}
|
|
|
|
if (slen > 8192)
|
|
free (buf);
|
|
return ret;
|
|
}
|