/* profile.c --- generate periodic events for profiling of Emacs Lisp code.
 Copyright (C) 1992, 1994 Free Software Foundation, Inc.
 Copyright (C) 2004 Ben Wing.

 Author: Boaz Ben-Zvi <boaz@lcs.mit.edu>

  This file is part of XEmacs.

  XEmacs 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, either version 3 of the License, or (at your
  option) any later version.

  XEmacs 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 XEmacs.  If not, see <http://www.gnu.org/licenses/>. */

/* Synched up with: FSF 19.28. */
/* #### Not sure if this is needed for XEmacs. */

/**
 **  To be run as an emacs process. Input string that starts with:
 **    'z' -- resets the watch (to zero).
 **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
 **    'q' -- exit.
 **
 **  abstraction : a stopwatch
 **  operations: reset_watch, get_time
 */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "../src/systime.h"

static struct timeval TV1, TV2;
static int watch_not_started = 1; /* flag */
static char time_string[30];

#ifdef WIN32_NATIVE
#include <sys/timeb.h>
/* Emulate gettimeofday (Ulrich Leodolter, 1/11/95).  */
void 
gettimeofday (struct timeval *tv, struct timezone *tz)
{
  struct _timeb tb;
  _ftime (&tb);

  tv->tv_sec = tb.time;
  tv->tv_usec = tb.millitm * 1000L;
  if (tz) 
    {
      tz->tz_minuteswest = tb.timezone;	/* minutes west of Greenwich  */
      tz->tz_dsttime = tb.dstflag;	/* type of dst correction  */
    }
}
#endif

/* Reset the stopwatch to zero.  */

static void
reset_watch (void)
{
  EMACS_GET_TIME (TV1);
  watch_not_started = 0;
}

/* This call returns the time since the last reset_watch call.  The time
   is returned as a string with the format  <seconds>.<micro-seconds> 
   If reset_watch was not called yet, exit.  */

static char *
get_time (void)
{
  if (watch_not_started)
    exit (1);  /* call reset_watch first ! */
  EMACS_GET_TIME (TV2);
  if (TV1.tv_usec > TV2.tv_usec)
    {
      TV2.tv_usec += 1000000;
      TV2.tv_sec--;
    }
  sprintf (time_string, "%lu.%06lu",
	  (unsigned long) TV2.tv_sec - TV1.tv_sec,
	  (unsigned long) TV2.tv_usec - TV1.tv_usec);
  return time_string;
}

int
main (int argc, char **argv)
{
  int c;
  while ((c = getchar ()) != EOF)
    {
      switch (c)
	{
	case 'z':
	  reset_watch ();
	  break;
	case 'p':
	  puts (get_time ());
	  break;
	case 'q':
	  exit (0);
	}
      /* Anything remaining on the line is ignored.  */
      while (c != '\n' && c != EOF)
	c = getchar ();
    }
  return 1;
}