From 0ecb606cb6cf65de1d9fc8a919bceb4be476c602 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Thu, 12 Jul 2007 18:26:36 +0000 Subject: 2.5-18.1 --- debug/wcsncat_chk.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 debug/wcsncat_chk.c (limited to 'debug/wcsncat_chk.c') diff --git a/debug/wcsncat_chk.c b/debug/wcsncat_chk.c new file mode 100644 index 0000000000..b28773ff27 --- /dev/null +++ b/debug/wcsncat_chk.c @@ -0,0 +1,96 @@ +/* Copyright (C) 1995, 1996, 1997, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1995. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + + +/* Append no more than N wide-character of SRC onto DEST. */ +wchar_t * +__wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen) +{ + wchar_t c; + wchar_t * const s = dest; + + /* Find the end of DEST. */ + do + { + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *dest++; + } + while (c != L'\0'); + + /* Make DEST point before next character, so we can increment + it while memory is read (wins on pipelined cpus). */ + ++destlen; + dest -= 2; + + if (n >= 4) + { + size_t n4 = n >> 2; + do + { + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *src++; + *++dest = c; + if (c == L'\0') + return s; + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *src++; + *++dest = c; + if (c == L'\0') + return s; + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *src++; + *++dest = c; + if (c == L'\0') + return s; + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *src++; + *++dest = c; + if (c == L'\0') + return s; + } while (--n4 > 0); + n &= 3; + } + + while (n > 0) + { + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + c = *src++; + *++dest = c; + if (c == L'\0') + return s; + n--; + } + + if (c != L'\0') + { + if (__builtin_expect (destlen-- == 0, 0)) + __chk_fail (); + *++dest = L'\0'; + } + + return s; +} -- cgit 1.4.1