[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

#include <mit-copyright.h>
#include <stdio.h>
#include <sys/types.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 = "$Header$";
7da203a3	11	#endif
de56407f	12
546bc43b	13	#include <mit-copyright.h>
de56407f	14	#include <stdio.h>
3014c74a	15	#include <sys/types.h>
de56407f	16	#include <sys/file.h>
	17
	18	/*
	19	* checksum_fd(fd)
	20	* returns 24-bit checksum of bytes in file
	21	*/
	22
	23	int
b18a5f6d	24	checksum_file(path)
b18a5f6d	25	char *path;
de56407f	26	{
de56407f	27	register int sum;
	28	register int ch;
	29	register FILE *f;
	30
de56407f	31	sum = 0;
b18a5f6d	32	f = fopen(path, "r");
de56407f	33	while ((ch = getc(f)) != EOF) {
	34	sum = (sum + ch) & ((1<<24)-1);
	35	}
	36	fclose(f);
	37	return(sum);
	38	}