ebcc-sys 0.1.1

/*
 * Copyright (c) 2020 rxi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

 #include "log.h"

 #define MAX_CALLBACKS 32
 
 typedef struct {
   log_LogFn fn;
   void *udata;
   int level;
 } Callback;
 
 static struct {
   void *udata;
   log_LockFn lock;
   int level;
   bool quiet;
   Callback callbacks[MAX_CALLBACKS];
 } L;
 
 
 static const char *level_strings[] = {
   "TRACE", "DEBUG", "INFO", "WARN", "ERROR", "FATAL"
 };
 
 #ifdef LOG_USE_COLOR
 static const char *level_colors[] = {
   "\x1b[94m", "\x1b[36m", "\x1b[32m", "\x1b[33m", "\x1b[31m", "\x1b[35m"
 };
 #endif
 
 
 static void stdout_callback(log_Event *ev) {
   char buf[16];
   buf[strftime(buf, sizeof(buf), "%H:%M:%S", ev->time)] = '\0';
 #ifdef LOG_USE_COLOR
   fprintf(
     ev->udata, "%s %s%-5s\x1b[0m \x1b[90m%s:%d:\x1b[0m ",
     buf, level_colors[ev->level], level_strings[ev->level],
     ev->file, ev->line);
 #else
   fprintf(
     ev->udata, "%s %-5s %s:%d: ",
     buf, level_strings[ev->level], ev->file, ev->line);
 #endif
   vfprintf(ev->udata, ev->fmt, ev->ap);
   fprintf(ev->udata, "\n");
   fflush(ev->udata);
 }
 
 
 static void file_callback(log_Event *ev) {
   char buf[64];
   buf[strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", ev->time)] = '\0';
   fprintf(
     ev->udata, "%s %-5s %s:%d: ",
     buf, level_strings[ev->level], ev->file, ev->line);
   vfprintf(ev->udata, ev->fmt, ev->ap);
   fprintf(ev->udata, "\n");
   fflush(ev->udata);
 }
 
 
 static void lock(void)   {
   if (L.lock) { L.lock(true, L.udata); }
 }
 
 
 static void unlock(void) {
   if (L.lock) { L.lock(false, L.udata); }
 }
 
 
 const char* log_level_string(int level) {
   return level_strings[level];
 }
 
 
 void log_set_lock(log_LockFn fn, void *udata) {
   L.lock = fn;
   L.udata = udata;
 }
 
 
 void log_set_level(int level) {
   L.level = level;
 }
 
 
 void log_set_quiet(bool enable) {
   L.quiet = enable;
 }
 
 
 int log_add_callback(log_LogFn fn, void *udata, int level) {
   for (int i = 0; i < MAX_CALLBACKS; i++) {
     if (!L.callbacks[i].fn) {
       L.callbacks[i] = (Callback) { fn, udata, level };
       return 0;
     }
   }
   return -1;
 }
 
 
 int log_add_fp(FILE *fp, int level) {
   return log_add_callback(file_callback, fp, level);
 }
 
 
 static void init_event(log_Event *ev, void *udata) {
   if (!ev->time) {
     time_t t = time(NULL);
     ev->time = localtime(&t);
   }
   ev->udata = udata;
 }
 
 
 void log_log(int level, const char *file, int line, const char *fmt, ...) {
   log_Event ev = {
     .fmt   = fmt,
     .file  = file,
     .line  = line,
     .level = level,
   };
 
   lock();
 
   if (!L.quiet && level >= L.level) {
     init_event(&ev, stderr);
     va_start(ev.ap, fmt);
     stdout_callback(&ev);
     va_end(ev.ap);
   }
 
   for (int i = 0; i < MAX_CALLBACKS && L.callbacks[i].fn; i++) {
     Callback *cb = &L.callbacks[i];
     if (level >= cb->level) {
       init_event(&ev, cb->udata);
       va_start(ev.ap, fmt);
       cb->fn(&ev);
       va_end(ev.ap);
     }
   }
 
   unlock();
 }