datapid.c

cygwin, 著名的在win32下模拟unix操作系统的东东

/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 */
/************

64 bits in a Cray word

				12345678901234567890123456789012
1234567890123456789012345678901234567890123456789012345678901234
________________________________________________________________
<    pid       >< word-offset in file (same #) ><    pid       >

1234567890123456789012345678901234567890123456789012345678901234
________________________________________________________________
<    pid       >< offset in file of this word  ><    pid       >


8 bits to a bytes == character
 NBPW            8 
************/

#include <stdio.h>
#include <sys/param.h>
#ifdef UNIT_TEST
#include <unistd.h>
#include <stdlib.h>
#endif

static char Errmsg[80];

#define LOWER16BITS(X)	(X & 0177777)
#define LOWER32BITS(X)	(X & 0xffffffff)

/***
#define HIGHBITS(WRD, bits) ( (-1 << (64-bits)) & WRD)
#define LOWBITS(WRD, bits) ( (-1 >> (64-bits)) & WRD)
****/

#define NBPBYTE		8		/* number bits per byte */

#ifndef DEBUG
#define DEBUG	0
#endif

/***********************************************************************
 *
 * 
 * 1   2   3   4   5   6   7   8   9   10  11  12  13  14  14  15	bytes
 * 1234567890123456789012345678901234567890123456789012345678901234	bits
 * ________________________________________________________________	1 word
 * <    pid       >< offset in file of this word  ><    pid       >
 * 
 * the words are put together where offset zero is the start.
 * thus, offset 16 is the start of  the second full word
 * Thus, offset 8 is in middle of word 1
 ***********************************************************************/
int
datapidgen(pid, buffer, bsize, offset)
int pid;
char *buffer;
int bsize;
int offset;
{
#if CRAY
	
   int cnt;
   int tmp;
   char *chr;
   long *wptr;
   long word;
   int woff;	/* file offset for the word */
   int boff;	/* buffer offset or index */
   int num_full_words;

    num_full_words = bsize/NBPW;
    boff = 0;

    if ( cnt=(offset % NBPW) ) {	/* partial word */

	woff = offset - cnt;
#if DEBUG
printf("partial at beginning, cnt = %d, woff = %d\n", cnt, woff);
#endif

	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;

	for (tmp=0; tmp<cnt; tmp++) {   /* skip unused bytes */
	    chr++;
        }

	for (; boff<(NBPW-cnt) && boff<bsize; boff++, chr++) {
	    buffer[boff] = *chr;
	}
    }

    /*
     * full words 
     */

    num_full_words = (bsize-boff)/NBPW;
	
    woff = offset+boff;
	
    for (cnt=0; cnt<num_full_words; woff += NBPW, cnt++ ) {

	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;
	for(tmp=0; tmp<NBPW; tmp++, chr++) {
	    buffer[boff++] = *chr;
	}
/****** Only if wptr is a word ellined
	wptr = (long *)&buffer[boff];
	*wptr = word;
	boff += NBPW;
*****/

    }

    /*
     * partial word at end of buffer
     */

    if ( cnt=((bsize-boff) % NBPW) ) {
#if DEBUG
printf("partial at end\n");
#endif
	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;

	for (tmp=0; tmp<cnt && boff<bsize; tmp++, chr++) {
	    buffer[boff++] = *chr;
	}
    }

    return bsize;

#else
	return -1;	/* not support on non-64 bits word machines  */

#endif

} 

/***********************************************************************
 *
 *
 ***********************************************************************/
int
datapidchk(pid, buffer, bsize, offset, errmsg)
int pid;
char *buffer;
int bsize;
int offset;
char **errmsg;
{
#if CRAY
	
   int cnt;
   int tmp;
   char *chr;
   long *wptr;
   long word;
   int woff;	/* file offset for the word */
   int boff;	/* buffer offset or index */
   int num_full_words;


    if ( errmsg != NULL ) {
        *errmsg = Errmsg;
    }


    num_full_words = bsize/NBPW;
    boff = 0;

    if ( cnt=(offset % NBPW) ) {	/* partial word */
	woff = offset - cnt;
	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;

	for (tmp=0; tmp<cnt; tmp++) {   /* skip unused bytes */
	    chr++;
        }

	for (; boff<(NBPW-cnt) && boff<bsize; boff++, chr++) {
	    if (buffer[boff] != *chr) {
		sprintf(Errmsg, "Data mismatch at offset %d, exp:%#o, act:%#o",
		    offset+boff, *chr, buffer[boff]);
		return offset+boff;
	    }
	}
    }

    /*
     * full words 
     */

    num_full_words = (bsize-boff)/NBPW;
	
    woff = offset+boff;
	
    for (cnt=0; cnt<num_full_words; woff += NBPW, cnt++ ) {
	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;
	for(tmp=0; tmp<NBPW; tmp++, boff++, chr++) {
	    if ( buffer[boff] != *chr ) {
	        sprintf(Errmsg, "Data mismatch at offset %d, exp:%#o, act:%#o",
	            woff, *chr, buffer[boff]);
	        return woff;
	    }
	}

/****** only if a word elined
	wptr = (long *)&buffer[boff];
	if ( *wptr != word ) {
	    sprintf(Errmsg, "Data mismatch at offset %d, exp:%#o, act:%#o",
	        woff, word, *wptr);
	    return woff;
	}
	boff += NBPW;
******/
    }

    /*
     * partial word at end of buffer
     */

    if ( cnt=((bsize-boff) % NBPW) ) {
#if DEBUG
printf("partial at end\n");
#endif
	word = ((LOWER16BITS(pid) << 48) | (LOWER32BITS(woff) << 16) | LOWER16BITS(pid));

	chr = (char *)&word;


	for (tmp=0; tmp<cnt && boff<bsize; boff++, tmp++, chr++) {
	    if ( buffer[boff] != *chr ) {
		sprintf(Errmsg, "Data mismatch at offset %d, exp:%#o, act:%#o",
		    offset+boff, *chr, buffer[boff]);
		return offset+boff;
	    }
	}
    }

    sprintf(Errmsg, "all %d bytes match desired pattern", bsize);
    return -1;      /* buffer is ok */

#else
	
    if ( errmsg != NULL ) {
        *errmsg = Errmsg;
    }
    sprintf(Errmsg, "Not supported on this OS.");
    return 0;

#endif


}       /* end of datapidchk */

#if UNIT_TEST

/***********************************************************************
 * main for doing unit testing
 ***********************************************************************/
int
main(ac, ag)
int ac;
char **ag;
{

int size=1234;
char *buffer;
int ret;
char *errmsg;

    if ((buffer=(char *)malloc(size)) == NULL ) {
        perror("malloc");
        exit(2);
    }


    datapidgen(-1, buffer, size, 3);

/***
fwrite(buffer, size, 1, stdout);
fwrite("\n", 1, 1, stdout);
****/

    printf("datapidgen(-1, buffer, size, 3)\n");

    ret=datapidchk(-1, buffer, size, 3, &errmsg);
    printf("datapidchk(-1, buffer, %d, 3, &errmsg) returned %d %s\n",
        size, ret, errmsg);
    ret=datapidchk(-1, &buffer[1], size-1, 4, &errmsg);
    printf("datapidchk(-1, &buffer[1], %d, 4, &errmsg) returned %d %s\n",
        size-1, ret, errmsg);

    buffer[25]= 0x0;
    buffer[26]= 0x0;
    buffer[27]= 0x0;
    buffer[28]= 0x0;
    printf("changing char 25-28\n");

    ret=datapidchk(-1, &buffer[1], size-1, 4, &errmsg);
    printf("datapidchk(-1, &buffer[1], %d, 4, &errmsg) returned %d %s\n",
        size-1, ret, errmsg);

printf("------------------------------------------\n");

    datapidgen(getpid(), buffer, size, 5);

/*******
fwrite(buffer, size, 1, stdout);
fwrite("\n", 1, 1, stdout);
******/

    printf("\ndatapidgen(getpid(), buffer, size, 5)\n");

    ret=datapidchk(getpid(), buffer, size, 5, &errmsg);
    printf("datapidchk(getpid(), buffer, %d, 5, &errmsg) returned %d %s\n",
        size, ret, errmsg);

    ret=datapidchk(getpid(), &buffer[1], size-1, 6, &errmsg);
    printf("datapidchk(getpid(), &buffer[1], %d, 6, &errmsg) returned %d %s\n",
        size-1, ret, errmsg);

    buffer[25]= 0x0;
    printf("changing char 25\n");

    ret=datapidchk(getpid(), &buffer[1], size-1, 6, &errmsg);
    printf("datapidchk(getpid(), &buffer[1], %d, 6, &errmsg) returned %d %s\n",
        size-1, ret, errmsg);

    exit(0);
}

#endif