/** * UTILITY module * * Copyright (C) 2001 Jeffrey Fulmer <jdfulmer@armstrong.com> * This file is part of LIBPING * * 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; either version 2 of the License, or * (at your option) any later version. * * 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., 675 Mass Ave, Cambridge, MA 02139, USA. * */#ifdef HAVE_CONFIG_H# include <config.h>#endif /* HAVE_CONFIG_H */#include <util.h>#ifdef STDC_HEADERS# include <string.h>#else# ifndef HAVE_STRCHR#  define strchr index#  define strrchr rindex# endif /* HAVE_STRCHR */char *strchr (), *strrchr ();# ifndef HAVE_MEMCPY#  define memcpy(d, s, n) bcopy ((s), (d), (n))#  define memmove(d, s, n) bcopy ((s), (d), (n))# endif /* HAVE_MEMCPY  */#endif  /* STDC_HEADERS */#include <stdio.h>#include <stdlib.h>#include <fcntl.h>#include <sys/types.h>#include <unistd.h>#include "memory.h"/** * elapsed_time * returns an int value for the difference * between now and starttime in milliseconds. */intelapsed_time( struct timeval *starttime ){  struct timeval *newtime;  int elapsed;  newtime = (struct timeval*)malloc( sizeof(struct timeval));  gettimeofday(newtime,NULL);  elapsed = 0;    if(( newtime->tv_usec - starttime->tv_usec) > 0 ){    elapsed += (newtime->tv_usec - starttime->tv_usec)/1000 ;  }  else{    elapsed += ( 1000000 + newtime->tv_usec - starttime->tv_usec ) /1000;    newtime->tv_sec--;  }  if(( newtime->tv_sec - starttime->tv_sec ) > 0 ){    elapsed += 1000 * ( newtime->tv_sec - starttime->tv_sec );  }  if( elapsed < 1 )    elapsed = 1;    free( newtime );  return( elapsed );} /** * substring         * returns a char pointer from int start  * to int length. */char * substring (char *buffer, int start, int length){  char *sub;  sub = xmalloc (sizeof (char) * (length + 1));	  if ((length < 1) || (start < 0) || (start > strlen (buffer)))    return NULL;  if (strlen (buffer) < length){    sub = (char*) strdup (buffer);    return buffer;  }  if (sub == NULL){    perror( "insufficient memory." );    exit( 1 );  }  memset (sub, 0, length + 1);  buffer += start;  memcpy (sub, buffer, length);  return sub;}