/** * Utility functions * Library: joedog * * Copyright (C) 2000, 2001, 2002 by * Jeffrey Fulmer - <jdfulmer@armstrong.com> * This file is distributed as part of Siege  * * 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.   *  */#include <util.h>#include <error.h>/** * substring        returns a char pointer from *                  start to start + length in a *                  larger char pointer (buffer). */char * substring (char *buffer, int start, int length){  char *sub;  sub = malloc (sizeof (char) * (length + 1));	  if ((length < 1) || (start < 0) || (start > (int)strlen (buffer)))    return NULL;  if ((int)strlen (buffer) < length){    sub = (char*) strdup (buffer);    return buffer;  }  if (sub == NULL){    joe_fatal( "insufficient memory." );  }  memset (sub, '\0', length + 1);  buffer += start;  strncpy( sub, buffer, length );  return sub;}/** * my_random        returns a random int */  int my_random( int max, int seed ){  srand( (unsigned)time( NULL ) * seed );   return (int)((double)rand() / ((double)RAND_MAX + 1) * max ); }void itoa( int n, char s[] ){  int i, sign;  if(( sign = n ) < 0 )    n = -n;  i = 0;  do{    s[i++] = n % 10 + '0';  } while(( n /= 10 ) > 0 );  if( sign < 0  )    s[i++] = '-';  s[i] = '\0';   reverse( s );}void reverse( char s[] ){  int c, i, j;  for( i = 0, j = strlen( s )-1; i < j; i++, j-- ){    c    = s[i];    s[i] = s[j];    s[j] = c;  } /** end of for     **/}   /** end of reverse **/float elapsed_time( clock_t time ){  long tps = sysconf( _SC_CLK_TCK );  return (float)time/tps;}