/* Copyright (C) 1995-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. 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 <https://www.gnu.org/licenses/>. */ #include <wchar.h> /* Append SRC on the end of DEST. Check for overflows. */ wchar_t * __wcscat_chk (wchar_t *dest, const wchar_t *src, size_t destlen) { wchar_t *s1 = dest; const wchar_t *s2 = src; wchar_t c; /* Find the end of the string. */ do { if (__glibc_unlikely (destlen-- == 0)) __chk_fail (); c = *s1++; } while (c != L'\0'); /* Make S1 point before the next character, so we can increment it while memory is read (wins on pipelined cpus). */ s1 -= 2; ++destlen; do { if (__glibc_unlikely (destlen-- == 0)) __chk_fail (); c = *s2++; *++s1 = c; } while (c != L'\0'); return dest; }