log.cc

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/*
 * ERSP  Player driver - Logging utilities
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>

static FILE *log_file = NULL;

static void
done_log(void)
{
   char errbuf[4096];
   time_t curtime = time(NULL);
   struct tm *loctime = localtime(&curtime);
   int len;

   len = strftime(errbuf, sizeof(errbuf), "%a, %d %b %Y %H:%M:%S %z",
               loctime);
   errbuf[len] = '\0';

   fprintf(log_file, "[%-5s %-15s %4s]: Log stopped at %s\n\n\n",
         "", "", "", errbuf);

   fclose(log_file);
}

void
ersp_log(char *msg, char *file, int line, char *fmt, ...)
{
   static char *log_files = NULL;
   static char *log_msg = NULL;
   char errbuf[4096];
   va_list params;

   if (!log_file) {
      char *log_name;
      time_t curtime = time(NULL);
      struct tm *loctime = localtime(&curtime);
      int len;

      log_files = getenv("ERSP_FILES");
      log_msg    = getenv("ERSP_MSG");
      log_name  = getenv("ERSP_LOG");
      log_file  = log_name ? fopen(log_name, "ab") : stderr;

      if (!log_file) return;

      len = strftime(errbuf, sizeof(errbuf), "%a, %d %b %Y %H:%M:%S %z",
                  loctime);
      errbuf[len] = '\0';

      fprintf(log_file, "\n\n[%-5s %-15s %4s]: Log started at %s\n",
            "type", "file", "line", errbuf);

      atexit(done_log);
   }

   if (log_files && !strstr(log_files, file))
      return;

   if (log_msg && !strstr(log_msg, msg))
      return;

   va_start(params, fmt);

   snprintf(errbuf, sizeof(errbuf), "[%-5s %-15s %4d]: %s",
          msg, file, line,  fmt);

   vfprintf(log_file, errbuf, params);
   fputc('\n', log_file);
   fflush(log_file);

   va_end(params);
}

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