/*
 * scamper_debug.c
 *
 * $Id: scamper_debug.c,v 1.17 2007/05/09 03:20:33 mjl Exp $
 *
 * routines to reduce the impact of debugging cruft in scamper's code.
 *
 * Copyright (C) 2003-2007 The University of Waikato
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <time.h>
#include <netdb.h>
#include <stdio.h>
#include <stdarg.h>

#include <assert.h>

#if defined(__APPLE__)
#include <stdint.h>
#endif

#include "scamper.h"
#include "scamper_debug.h"
#include "utils.h"

static char *timestamp_str(char *buf, const size_t len)
{
  struct timeval  tv;
  struct tm      *tm;
  int             ms;
  time_t          t;

  buf[0] = '\0';
  if(gettimeofday_wrap(&tv) == -1) return buf;
  t = tv.tv_sec;
  if((tm = localtime(&t)) == NULL) return buf;

  ms = tv.tv_usec / 1000;
  snprintf(buf, len, "[%02d:%02d:%02d:%03d] ",
	   tm->tm_hour, tm->tm_min, tm->tm_sec, ms);

  return buf;
}

static char *error_str(const int e,
		       char *(*error_itoa)(int),
		       char *buf, const size_t len)
{
  char *str;

  if(error_itoa == NULL || (str = error_itoa(e)) == NULL)
    {
      buf[0] = '\0';
      return buf;
    }

  snprintf(buf, len, ": %s", str);
  return buf;
}

/*
 * printerror
 *
 * format a nice and consistent error string using the errno to string
 * conversion utilities and the arguments supplied
 */
void printerror(const int ecode, char *(*error_itoa)(int),
		const char *func, const char *format, ...)
{
  char     message[512];
  char     err[128];
  char     ts[16];
  char     fs[64];
  va_list  ap;

  va_start(ap, format);
  vsnprintf(message, sizeof(message), format, ap);
  va_end(ap);

  error_str(ecode, error_itoa, err, sizeof(err));
  timestamp_str(ts, sizeof(ts));

  if(func != NULL) snprintf(fs, sizeof(fs), "%s: ", func);
  else             fs[0] = '\0';

  fprintf(stderr, "%s%s%s%s\n", ts, fs, message, err);
  fflush(stderr);

  return;
}

#ifndef NDEBUG
void scamper_debug(const char *func, const char *format, ...)
{
  char     message[512];
  va_list  ap;
  char     ts[16];
  char     fs[64];

  assert(format != NULL);

  va_start(ap, format);
  vsnprintf(message, sizeof(message), format, ap);
  va_end(ap);

  timestamp_str(ts, sizeof(ts));

  if(func != NULL) snprintf(fs, sizeof(fs), "%s: ", func);
  else             fs[0] = '\0';

  fprintf(stderr, "%s%s%s\n", ts, fs, message);
  fflush(stderr);
  return;
}
#endif