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LICENSE
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19
LICENSE
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Copyright (c) 2017 rxi
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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70
README.md
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70
README.md
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# log.c
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A simple logging library implemented in C99
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## Usage
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**[log.c](src/log.c?raw=1)** and **[log.h](src/log.h?raw=1)** should be dropped
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into an existing project and compiled along with it. The library provides 6
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function-like macros for logging:
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```c
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log_trace(const char *fmt, ...);
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log_debug(const char *fmt, ...);
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log_info(const char *fmt, ...);
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log_warn(const char *fmt, ...);
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log_error(const char *fmt, ...);
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log_fatal(const char *fmt, ...);
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```
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Each function takes a printf format string followed by additional arguments:
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```c
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log_trace("Hello %s", "world")
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```
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Resulting in a line with the given format printed to stderr:
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```
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20:18:26 TRACE src/main.c:11: Hello world
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```
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#### log_set_quiet(int enable)
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Quiet-mode can be enabled by passing `1` to the `log_set_quiet()` function.
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While this mode is enabled the library will not output anything to stderr, but
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will continue to write to the file if one is set.
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#### log_set_level(int level)
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The current logging level can be set by using the `log_set_level()` function.
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All logs below the given level will be ignored. By default the level is
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`LOG_TRACE`, such that nothing is ignored.
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#### log_set_fp(FILE *fp)
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A file pointer where the log should be written can be provided to the library by
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using the `log_set_fp()` function. The data written to the file output is
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of the following format:
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```
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2047-03-11 20:18:26 TRACE src/main.c:11: Hello world
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```
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#### log_set_lock(log_LockFn fn)
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If the log will be written to from multiple threads a lock function can be set.
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The function is passed a `udata` value (set by `log_set_udata()`) and the
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integer `1` if the lock should be acquired or `0` if the lock should be
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released.
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#### LOG_USE_COLOR
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If the library is compiled with `-DLOG_USE_COLOR` ANSI color escape codes will
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be used when printing.
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## License
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This library is free software; you can redistribute it and/or modify it under
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the terms of the MIT license. See [LICENSE](LICENSE) for details.
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134
src/log.c
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134
src/log.c
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/*
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* Copyright (c) 2017 rxi
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <time.h>
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#include "log.h"
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static struct {
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void *udata;
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log_LockFn lock;
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FILE *fp;
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int level;
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int quiet;
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} L;
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static const char *level_names[] = {
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"TRACE", "DEBUG", "INFO", "WARN", "ERROR", "FATAL"
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};
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#ifdef LOG_USE_COLOR
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static const char *level_colors[] = {
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"\x1b[94m", "\x1b[36m", "\x1b[32m", "\x1b[33m", "\x1b[31m", "\x1b[35m"
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};
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#endif
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static void lock(void) {
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if (L.lock) {
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L.lock(L.udata, 1);
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}
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}
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static void unlock(void) {
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if (L.lock) {
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L.lock(L.udata, 0);
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}
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}
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void log_set_udata(void *udata) {
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L.udata = udata;
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}
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void log_set_lock(log_LockFn fn) {
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L.lock = fn;
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}
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void log_set_fp(FILE *fp) {
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L.fp = fp;
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}
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void log_set_level(int level) {
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L.level = level;
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}
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void log_set_quiet(int enable) {
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L.quiet = enable ? 1 : 0;
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}
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void log_log(int level, const char *file, int line, const char *fmt, ...) {
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if (level < L.level) {
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return;
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}
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/* Acquire lock */
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lock();
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/* Get current time */
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time_t t = time(NULL);
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struct tm *lt = localtime(&t);
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/* Log to stderr */
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if (!L.quiet) {
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va_list args;
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char buf[16];
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buf[strftime(buf, sizeof(buf), "%H:%M:%S", lt)] = '\0';
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#ifdef LOG_USE_COLOR
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fprintf(
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stderr, "%s %s%-5s\x1b[0m \x1b[90m%s:%d:\x1b[0m ",
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buf, level_colors[level], level_names[level], file, line);
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#else
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fprintf(stderr, "%s %-5s %s:%d: ", buf, level_names[level], file, line);
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#endif
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va_start(args, fmt);
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vfprintf(stderr, fmt, args);
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va_end(args);
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fprintf(stderr, "\n");
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}
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/* Log to file */
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if (L.fp) {
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va_list args;
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char buf[32];
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buf[strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", lt)] = '\0';
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fprintf(L.fp, "%s %-5s %s:%d: ", buf, level_names[level], file, line);
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va_start(args, fmt);
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vfprintf(L.fp, fmt, args);
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va_end(args);
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fprintf(L.fp, "\n");
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}
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/* Release lock */
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unlock();
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}
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35
src/log.h
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35
src/log.h
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/**
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* Copyright (c) 2017 rxi
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MIT license. See `microtar.c` for details.
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*/
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#ifndef LOG_H
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#define LOG_H
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#include <stdio.h>
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#include <stdarg.h>
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#define LOG_VERSION "0.1.0"
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typedef void (*log_LockFn)(void *udata, int lock);
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enum { LOG_TRACE, LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR, LOG_FATAL };
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#define log_trace(...) log_log(LOG_TRACE, __FILE__, __LINE__, __VA_ARGS__)
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#define log_debug(...) log_log(LOG_DEBUG, __FILE__, __LINE__, __VA_ARGS__)
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#define log_info(...) log_log(LOG_INFO, __FILE__, __LINE__, __VA_ARGS__)
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#define log_warn(...) log_log(LOG_WARN, __FILE__, __LINE__, __VA_ARGS__)
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#define log_error(...) log_log(LOG_ERROR, __FILE__, __LINE__, __VA_ARGS__)
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#define log_fatal(...) log_log(LOG_FATAL, __FILE__, __LINE__, __VA_ARGS__)
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void log_set_udata(void *udata);
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void log_set_lock(log_LockFn fn);
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void log_set_fp(FILE *fp);
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void log_set_level(int level);
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void log_set_quiet(int enable);
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void log_log(int level, const char *file, int line, const char *fmt, ...);
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#endif
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