| /* Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <wchar.h> |
| |
| |
| /* 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; |
| } |