?? util.c
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/** * 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;}
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