Loguva (Log + Uva) is a library that provides a simple and lightweight interface for logging.

Features:

• Multiple log destinations.
• Multiple log levels.
• Fancy stdout.

git clone https://github.com/febits/loguva

cd loguva

make

sudo make install

make samples

Firstly, you need to include the main header file: loguva.h. Don't forget to pass the -lloguva to the linker.

Basically, the loguva allows adding up to 20 instances of FILE * by calling one of the following functions below:

bool loguva_add_stream(FILE *stream);

FILE *loguva_add_file(const char *path);

Once you call the macro below passing the log level and the message, you are logging:

#define loguva(lv, fmt, ...)                                                   \
  loguva_log(lv, __FILE__, __LINE__, fmt, ##__VA_ARGS__)

Log levels:

enum log_levels { DEBUG, INFO, WARNING, ERROR, FATAL };

Let's suppose that you want to log both STDOUT and some FILE *:

#include <loguva.h>

int main(void) {
    
    loguva_add_stream(stdout);
    loguva_add_file("/tmp/loguva.log");

    int x = 50;

    loguva(DEBUG, "The value of X: %d", x);

    return 0;
}

When you call loguva(), all instances of FILE * will be used to write the full log message. As you can see above, both STDOUT and /tmp/loguva.log.

• https://github.com/rxi/log.c