[moira.git] / update / checksum.c

/*
 *	$Source$
 *	$Header$
 */
/*  (c) Copyright 1988 by the Massachusetts Institute of Technology. */
/*  For copying and distribution information, please see the file */
/*  <mit-copyright.h>. */

#ifndef lint
static char *rcsid_checksum_c = "$Header$";
#endif	lint

#include <mit-copyright.h>
#include <stdio.h>
#include <sys/file.h>

/*
 * checksum_fd(fd)
 * returns 24-bit checksum of bytes in file
 */

int
checksum_file(path)
char *path;
{
    register int sum;
    register int ch;
    register FILE *f;

    sum = 0;
    f = fopen(path, "r");
    while ((ch = getc(f)) != EOF) {
	sum = (sum + ch) & ((1<<24)-1);
    }
    fclose(f);
    return(sum);
}
Commit	Line	Data
de56407f	1	/*
	2	* $Source$
	3	* $Header$
	4	*/
546bc43b	5	/* (c) Copyright 1988 by the Massachusetts Institute of Technology. */
	6	/* For copying and distribution information, please see the file */
	7	/* <mit-copyright.h>. */
de56407f	8
	9	#ifndef lint
	10	static char *rcsid_checksum_c = "$Header$";
	11	#endif lint
	12
546bc43b	13	#include <mit-copyright.h>
de56407f	14	#include <stdio.h>
	15	#include <sys/file.h>
	16
	17	/*
	18	* checksum_fd(fd)
	19	* returns 24-bit checksum of bytes in file
	20	*/
	21
	22	int
b18a5f6d	23	checksum_file(path)
b18a5f6d	24	char *path;
de56407f	25	{
de56407f	26	register int sum;
	27	register int ch;
	28	register FILE *f;
	29
de56407f	30	sum = 0;
b18a5f6d	31	f = fopen(path, "r");
de56407f	32	while ((ch = getc(f)) != EOF) {
	33	sum = (sum + ch) & ((1<<24)-1);
	34	}
	35	fclose(f);
	36	return(sum);
	37	}