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

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

This file is part of GNU Emacs.

GNU Emacs 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 2, or (at your option)
any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */


/**
** 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 <stdio.h>
#include <../src/config.h>
#include <../src/systime.h>

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

/* Reset the stopwatch to zero. */

void
reset_watch ()
{
  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. */

char *
get_time ()
{
  if (watch_not_started)
    exit (1); /* call reset_watch first ! */
  EMACS_GET_TIME (TV2);
  EMACS_SUB_TIME (TV2, TV2, TV1);
  sprintf (time_string, "%lu.%06lu", EMACS_SECS (TV2), EMACS_USECS (TV2));
  return time_string;
}

#if ! defined (HAVE_GETTIMEOFDAY) && defined (HAVE_TIMEVAL)
 
/* ARGSUSED */
gettimeofday (tp, tzp)
     struct timeval *tp;
     struct timezone *tzp;
{
  extern long time ();

  tp->tv_sec = time ((long *)0);
  tp->tv_usec = 0;
  if (tzp != 0)
    tzp->tz_minuteswest = -1;
}
#endif

void
main ()
{
  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 ();
    }
  exit (1);
}
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