text: /**
   * Copyright (c) 2020 rxi
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the MIT license. See `log.c` for details.
   */
  
  #ifndef LOG_H
  #define LOG_H
  
  #include <stdio.h>
  #include <stdarg.h>
  #include <stdbool.h>
  
  #define LOG_VERSION "0.1.0"
  #define LOG_USE_COLOR
  
  typedef struct {
    va_list ap;
    const char *fmt;
    const char *file;
    uint32_t time;
    void *udata;
    int line;
    int level;
  } log_Event;
  
  typedef void (*log_LogFn)(log_Event *ev);
  typedef void (*log_LockFn)(bool lock, void *udata);
  
  enum { LOG_TRACE, LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR, LOG_FATAL };
  
  #define log_trace(...) log_log(LOG_TRACE, __FILE__, __LINE__, __VA_ARGS__)
  #define log_debug(...) log_log(LOG_DEBUG, __FILE__, __LINE__, __VA_ARGS__)
  #define log_info(...)  log_log(LOG_INFO,  __FILE__, __LINE__, __VA_ARGS__)
  #define log_warn(...)  log_log(LOG_WARN,  __FILE__, __LINE__, __VA_ARGS__)
  #define log_error(...) log_log(LOG_ERROR, __FILE__, __LINE__, __VA_ARGS__)
  #define log_fatal(...) log_log(LOG_FATAL, __FILE__, __LINE__, __VA_ARGS__)
  
  const char* log_level_string(int level);
  void log_set_lock(log_LockFn fn, void *udata);
  void log_set_level(int level);
  void log_set_quiet(bool enable);
  int log_add_callback(log_LogFn fn, void *udata, int level);
  int log_add_fp(FILE *fp, int level);
  
  void log_log(int level, const char *file, int line, const char *fmt, ...);
  
  #endif
  