2109f12c3b
strerrordesc_np() isn't very useful (being just another name for strerror()), but strerrorname_np() lets you get "ENOSYS" for ENOSYS, which will make some of our test assertion messages clearer when we switch over from strerror(). This also adds `%#m` formatting to all the relevant functions. Test: treehugger Change-Id: Icfe07a39a307d591c3f4f2a09d008dc021643062
104 lines
3.5 KiB
C++
104 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 <async_safe/log.h>
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#include "private/ErrnoRestorer.h"
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#include <string.h>
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#include "bionic/pthread_internal.h"
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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 const char* __sys_error_names[] = {
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#define __BIONIC_ERRDEF(error_number, error_description) [error_number] = #error_number,
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#include "private/bionic_errdefs.h"
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};
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extern "C" const char* strerrorname_np(int error_number) {
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if (error_number < 0 || error_number >= static_cast<int>(arraysize(__sys_error_names))) {
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return nullptr;
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}
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return __sys_error_names[error_number];
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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 = async_safe_format_buffer(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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extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) {
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ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates...
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strerror_r(error_number, buf, buf_len);
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return buf; // ...and just returns whatever fit.
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}
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char* strerror(int error_number) {
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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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bionic_tls& tls = __get_bionic_tls();
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result = tls.strerror_buf;
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strerror_r(error_number, result, sizeof(tls.strerror_buf));
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return result;
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}
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