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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libssp/] [gets-chk.c] - Blame information for rev 761

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Line No. Rev Author Line
1 741 jeremybenn
/* Checking gets.
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   Copyright (C) 2005, 2009 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file.  (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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<http://www.gnu.org/licenses/>.  */
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#include "config.h"
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#include <ssp/ssp.h>
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#include <stdarg.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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#endif
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#ifdef HAVE_STDIO_H
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# include <stdio.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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extern void __chk_fail (void) __attribute__((__noreturn__));
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char *
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__gets_chk (char *s, size_t slen)
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{
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  char *ret, *buf;
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  if (slen >= (size_t) INT_MAX)
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    return gets (s);
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  if (slen <= 8192)
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    buf = alloca (slen + 1);
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  else
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    buf = malloc (slen + 1);
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  if (buf == NULL)
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    return gets (s);
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  ret = fgets (buf, (int) (slen + 1), stdin);
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  if (ret != NULL)
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    {
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      size_t len = strlen (buf);
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      if (len > 0 && buf[len - 1] == '\n')
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        --len;
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      if (len == slen)
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        __chk_fail ();
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      memcpy (s, buf, len);
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      s[len] = '\0';
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      ret = s;
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    }
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  if (slen > 8192)
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    free (buf);
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  return ret;
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}

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