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c-logger

★ 177 Open GitHub ↗

A simple logging library for C/C++

// repository documentation

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# C logger

## Table of Contents
- [What is this?](#what-is-this)
- [Installation](#installation)
- [Platform](#platform)
- [Benchmark](#benchmark)
- [Log format](#log-format)
- [Example](#example)
- [License](#license)

## What is this?
This is a simple logging library for C/C++.

This library's main features:
- Lightweight - only 500-line source code
- C89 support
- Thread-safe
- 2 logging types:
  - Console logging
  - File logging rotated by file size
- Custom with a configuration file

## Installation
```
./build.sh
cd build
make
sudo make install
```
or

```
build.bat
```
or

Copy files in src directory to your project

## Platform
- Windows (Visual Studio 2008+)
- Mac OS X (clang 3.6+)
- Linux (gcc 4.8.4+)

Note: Operations are confirmed on the above platforms

## Benchmark
This following table comparing other libraries is benchmark results to log 1,000,000 times.

| threads  | c-logger | glog     |
|:---------|---------:|---------:|
| 1        | 0.832s   | 1.267s   |
| 10       | 1.386s   | 1.183s   |

**Benchmark environment**
- Processor: Intel Core i3-4170 CPU @ 3.70GHz
- Memory: 8.0GB
- OS: Ubuntu 16.04 64bit

## Log format
```
level yy-MM-dd hh:mm:ss:uuuuuu threadid file:line: message
```

## Example
#### Console logging
```c
logger_initConsoleLogger(stderr);
logger_setLevel(LogLevel_DEBUG);
LOG_INFO("console logging");
```

#### File logging
```c
logger_initFileLogger("logs/log.txt", 1024 * 1024, 5);
logger_setLevel(LogLevel_DEBUG);
LOG_INFO("file logging");
LOG_DEBUG("format example: %d%c%s", 1, '2', "3");
```

The output of the file logger is the following:
```
I 15-11-10 00:32:43.771455 2854 filelogger.c:6: file logging
D 15-11-10 00:32:43.771564 2854 filelogger.c:7: format example: 123
```

#### Multi logging
```c
logger_initConsoleLogger(NULL);
logger_initFileLogger("logs/log.txt", 0, 0);
LOG_INFO("multi logging");
```

## License
The MIT license

c-logger

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