slog

slog is a fast and customizable logging library written in C89.

Features

• Custom formats for the output
• Optionally colored output
• Certain log levels can be suppressed

Example

#include <slog/slog.h>

int main (void) {
    slog_stream *logger = slog_create ("mylog.txt", slog_flags_none);
    if (!logger)
        return -1;
    if (slog_format (logger, "[%l] %d/%M/%Y: %L") != 0) {
        return -2;
    }
    slog_message (logger, "My message");
    const char *message = "message";
    slog_printf (logger, slog_loglevel_message, "My formatted %s", message);

    slog_colorized (logger, 1);
    slog_error (logger, "This message now will be red (if the OS supports it)");
    slog_debug (logger, "You won't see this message unless...");
    slog_suppress (logger, SLOG_SUPPRESS_NOTHING);
    slog_debug (logger, "Now this message is visible!");

    slog_close (logger);
    return 0;
}

More informative examples can be found in test/ directory.

Format

You can use the following symbols to describe your log format:

• %c - standart time representation (see: acstime ())
• %h - hours (12h)
• %H - hours (24h)
• %m - minutes
• %s - seconds
• %d - days
• %M - months
• %y - years [2 digit]
• %Y - years [4 digit]
• %l - log level
• %L - message
• %p - seconds since the start of the program
• %P - seconds since 01/01/1970

Building

To build and install slog library on a *nix system, in your shell type:

mkdir build && cd build\
cmake ../ && make && sudo make install

You can also compile the contents of the test/ directory by appending -DSLOG_EXAMPLES=1 to the cmake command.