mirror of https://github.com/topjohnwu/Magisk
101 lines
3.5 KiB
C++
101 lines
3.5 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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// -std=gnu++XX automatically defines _GNU_SOURCE, which then means that <string.h>
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// gives us the GNU variant, which is not what we're defining here.
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#undef _GNU_SOURCE
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include "private/ErrnoRestorer.h"
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#include <string.h>
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#include <stdio.h>
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// The arraysize(arr) macro returns the # of elements in an array arr.
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// The expression is a compile-time constant, and therefore can be
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// used in defining new arrays, for example. If you use arraysize on
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// a pointer by mistake, you will get a compile-time error.
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//
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// One caveat is that arraysize() doesn't accept any array of an
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// anonymous type or a type defined inside a function.
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//
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// This template function declaration is used in defining arraysize.
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// Note that the function doesn't need an implementation, as we only
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// use its type.
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template <typename T, size_t N>
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char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting)
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#define arraysize(array) (sizeof(ArraySizeHelper(array)))
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static const char* __sys_error_descriptions[] = {
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#define __BIONIC_ERRDEF(error_number, error_description) [error_number] = error_description,
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#include "private/bionic_errdefs.h"
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};
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static inline const char* __strerror_lookup(int error_number) {
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if (error_number < 0 || error_number >= static_cast<int>(arraysize(__sys_error_descriptions))) {
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return nullptr;
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}
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return __sys_error_descriptions[error_number];
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}
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int strerror_r(int error_number, char* buf, size_t buf_len) {
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ErrnoRestorer errno_restorer;
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size_t length;
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const char* error_name = __strerror_lookup(error_number);
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if (error_name != nullptr) {
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length = strlcpy(buf, error_name, buf_len);
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} else {
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length = snprintf(buf, buf_len, "Unknown error %d", error_number);
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}
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if (length >= buf_len) {
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return ERANGE;
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}
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return 0;
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}
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char* strerror(int error_number) {
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static char strerror_buf[NL_TEXTMAX];
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// Just return the original constant in the easy cases.
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char* result = const_cast<char*>(__strerror_lookup(error_number));
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if (result != nullptr) {
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return result;
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}
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result = strerror_buf;
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strerror_r(error_number, result, sizeof(strerror_buf));
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return result;
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}
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