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# clog: C-style (a-la printf) logging library
[](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);
}
```
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