A simple logging library implemented in C99
log.c and log.h should be dropped into an existing project and compiled along with it. The library provides 6 function-like macros for logging:
log_trace(const char *fmt, ...);
log_debug(const char *fmt, ...);
log_info(const char *fmt, ...);
log_warn(const char *fmt, ...);
log_error(const char *fmt, ...);
log_fatal(const char *fmt, ...);Each function takes a printf format string followed by additional arguments:
log_trace("Hello %s", "world")Resulting in a line with the given format printed to stderr:
20:18:26 TRACE src/main.c:11: Hello world
Quiet-mode can be enabled by passing 1 to the log_set_quiet() function.
While this mode is enabled the library will not output anything to stderr, but
will continue to write to the file if one is set.
The current logging level can be set by using the log_set_level() function.
All logs below the given level will be ignored. By default the level is
LOG_TRACE, such that nothing is ignored.
A file pointer where the log should be written can be provided to the library by
using the log_set_fp() function. The data written to the file output is
of the following format:
2047-03-11 20:18:26 TRACE src/main.c:11: Hello world
If the log will be written to from multiple threads a lock function can be set.
The function is passed a udata value (set by log_set_udata()) and the
integer 1 if the lock should be acquired or 0 if the lock should be
released.
If the library is compiled with -DLOG_USE_COLOR ANSI color escape codes will
be used when printing.
This library is free software; you can redistribute it and/or modify it under the terms of the MIT license. See LICENSE for details.