32bc0fcf69
Fixes -Wzero-as-null-pointer-constant warning. Test: m Bug: 68236239 Change-Id: I5b4123bc6709641315120a191e36cc57541349b2
122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <async_safe/log.h>
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static const char* syslog_log_tag = nullptr;
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static int syslog_priority_mask = 0xff;
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void closelog() {
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syslog_log_tag = nullptr;
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}
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void openlog(const char* log_tag, int /*options*/, int /*facility*/) {
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syslog_log_tag = log_tag;
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}
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int setlogmask(int new_mask) {
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int old_mask = syslog_priority_mask;
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// 0 is used to query the current mask.
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if (new_mask != 0) {
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syslog_priority_mask = new_mask;
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}
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return old_mask;
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}
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void syslog(int priority, const char* fmt, ...) {
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va_list args;
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va_start(args, fmt);
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vsyslog(priority, fmt, args);
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va_end(args);
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}
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void vsyslog(int priority, const char* fmt, va_list args) {
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int caller_errno = errno;
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// Check whether we're supposed to be logging messages of this priority.
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if ((syslog_priority_mask & LOG_MASK(LOG_PRI(priority))) == 0) {
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return;
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}
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// What's our log tag?
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const char* log_tag = syslog_log_tag;
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if (log_tag == nullptr) {
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log_tag = getprogname();
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}
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// What's our Android log priority?
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priority &= LOG_PRIMASK;
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int android_log_priority;
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if (priority <= LOG_ERR) {
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android_log_priority = ANDROID_LOG_ERROR;
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} else if (priority == LOG_WARNING) {
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android_log_priority = ANDROID_LOG_WARN;
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} else if (priority <= LOG_INFO) {
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android_log_priority = ANDROID_LOG_INFO;
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} else {
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android_log_priority = ANDROID_LOG_DEBUG;
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}
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// glibc's printf family support %m directly, but our BSD-based one doesn't.
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// If the format string seems to contain "%m", rewrite it.
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const char* log_fmt = fmt;
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if (strstr(fmt, "%m") != nullptr) {
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size_t dst_len = 1024;
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char* dst = reinterpret_cast<char*>(malloc(dst_len));
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log_fmt = dst;
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const char* src = fmt;
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for (; dst_len > 0 && *src != '\0'; ++src) {
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if (*src == '%' && *(src + 1) == 'm') {
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// Expand %m.
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size_t n = strlcpy(dst, strerror(caller_errno), dst_len);
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if (n >= dst_len) {
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n = dst_len;
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}
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dst += n;
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dst_len -= n;
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++src;
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} else if (*src == '%' && *(src + 1) == '%') {
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// We need to copy pairs of '%'s so the %m test works.
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if (dst_len <= 2) {
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break;
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}
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*dst++ = '%'; --dst_len;
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*dst++ = '%'; --dst_len;
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++src;
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} else {
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*dst++ = *src; --dst_len;
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}
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}
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*dst = '\0';
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}
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// We can't let async_safe_format_log do the formatting because it doesn't support
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// all the printf functionality.
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char log_line[1024];
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vsnprintf(log_line, sizeof(log_line), log_fmt, args);
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if (log_fmt != fmt) {
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free(const_cast<char*>(log_fmt));
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}
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async_safe_format_log(android_log_priority, log_tag, "%s", log_line);
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}
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