| /* Checking gets. |
| Copyright (C) 2005-2020 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; |
| } |