[moira.git] / update / checksum.c

/*
 *	$Source$
 *	$Header$
 */

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

#include <stdio.h>
#include <sys/file.h>

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

int
checksum_fd(fd1)
    int fd1;
{
    int fd;
    register int sum;
    register int ch;
    register FILE *f;

    fd = dup(fd1);
    sum = 0;
    (void) lseek(fd, 0, L_SET);
    f = fdopen(fd, "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	*/
	5
	6	#ifndef lint
	7	static char *rcsid_checksum_c = "$Header$";
	8	#endif lint
	9
	10	#include <stdio.h>
	11	#include <sys/file.h>
	12
	13	/*
	14	* checksum_fd(fd)
	15	* returns 24-bit checksum of bytes in file
	16	*/
	17
	18	int
	19	checksum_fd(fd1)
	20	int fd1;
	21	{
	22	int fd;
	23	register int sum;
	24	register int ch;
	25	register FILE *f;
	26
	27	fd = dup(fd1);
	28	sum = 0;
	29	(void) lseek(fd, 0, L_SET);
	30	f = fdopen(fd, "r");
	31	while ((ch = getc(f)) != EOF) {
	32	sum = (sum + ch) & ((1<<24)-1);
	33	}
	34	fclose(f);
	35	return(sum);
	36	}