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debug/strcat_chk.c
54 строки
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Copyright (C) 1991-2026 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 <string.h> #include <memcopy.h> /* Append SRC on the end of DEST. */ char * __strcat_chk (char *dest, const char *src, size_t destlen) { char *s1 = dest; const char *s2 = src; char c; /* Find the end of the string. */ do { if (__glibc_unlikely (destlen-- == 0)) __chk_fail (); c = *s1++; } while (c != '\0'); /* Make S1 point before the next character, so we can increment it while memory is read (wins on pipelined cpus). */ ++destlen; s1 -= 2; do { if (__glibc_unlikely (destlen-- == 0)) __chk_fail (); c = *s2++; *++s1 = c; } while (c != '\0'); return dest; }