File: README.md

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# clog: C-style (a-la printf) logging library

[![BSD (2 clause) License](https://img.shields.io/badge/License-BSD%202--Clause%20%22Simplified%22%20License-blue.svg)](https://github.com/pytorch/cpuinfo/blob/master/deps/clog/LICENSE)

C-style library for logging errors, warnings, information notes, and debug information.

## Features

- printf-style interface for formatting variadic parameters.
- Separate functions for logging errors, warnings, information notes, and debug information.
- Independent logging settings for different modules.
- Logging to logcat on Android and stderr/stdout on other platforms.
- Compatible with C99 and C++.
- Covered with unit tests.

## Example

```c
#include <clog.h>

#ifndef MYMODULE_LOG_LEVEL
    #define MYMODULE_LOG_LEVEL CLOG_DEBUG
#endif

CLOG_DEFINE_LOG_DEBUG(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
CLOG_DEFINE_LOG_INFO(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
CLOG_DEFINE_LOG_WARNING(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
CLOG_DEFINE_LOG_ERROR(mymodule_, "My Module", MYMODULE_LOG_LEVEL);

...

void some_function(...) {
    int status = ...
    if (status != 0) {
        mymodule_log_error(
            "something really bad happened: "
            "operation failed with status %d", status);
    }

    uint32_t expected_zero = ...
    if (expected_zero != 0) {
        mymodule_log_warning(
            "something suspicious happened (var = %"PRIu32"), "
            "fall back to generic implementation", expected_zero);
    }

    void* usually_non_null = ...
    if (usually_non_null == NULL) {
        mymodule_log_info(
            "something unusual, but common, happened: "
            "enabling work-around");
    }

    float a = ...
    mymodule_log_debug("computed a = %.7f", a);
}
```