d1eda33f01
Moving to a "function: message" style avoids ambiguity. Change-Id: If9d590e50265c61725d3673bd03796e65edd2d5e
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "private/libc_logging.h"
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/*
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* Runtime implementation of __builtin____strncat_chk.
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*
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* See
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* http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
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* http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
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* for details.
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*
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* This strncat check is called if _FORTIFY_SOURCE is defined and
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* greater than 0.
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*/
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extern "C" char* __strncat_chk(char* __restrict dest, const char* __restrict src,
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size_t len, size_t dest_buf_size) {
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if (len == 0) {
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return dest;
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}
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size_t dest_len = __strlen_chk(dest, dest_buf_size);
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char *d = dest + dest_len;
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dest_buf_size -= dest_len;
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while (*src != '\0') {
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*d++ = *src++;
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len--; dest_buf_size--;
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if (__predict_false(dest_buf_size == 0)) {
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__fortify_chk_fail("strncat: prevented write past end of buffer",
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BIONIC_EVENT_STRNCAT_BUFFER_OVERFLOW);
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}
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if (len == 0) {
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break;
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}
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}
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*d = '\0';
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return dest;
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}
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