sum.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
/*
* Copyright (c) 1983,1984,1985,1986,1987,1988,1996, by Sun Microsystems, Inc.
* All Rights Reserved.
*/
#ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
/*
* Sum bytes in file mod 2^16
*/
#include <stdio.h>
main(argc,argv)
char **argv;
{
register unsigned sum;
register i, c;
register FILE *f;
register long long nbytes;
int errflg = 0;
i = 1;
do {
if(i < argc) {
if ((f = fopen(argv[i], "r")) == NULL) {
fprintf(stderr, "sum: Can't open %s\n", argv[i]);
errflg += 10;
continue;
}
} else
f = stdin;
sum = 0;
nbytes = 0;
while ((c = getc(f)) != EOF) {
nbytes++;
if (sum&01)
sum = (sum>>1) + 0x8000;
else
sum >>= 1;
sum += c;
sum &= 0xFFFF;
}
if (ferror(f)) {
errflg++;
fprintf(stderr, "sum: read error on %s\n", argc>1?argv[i]:"-");
}
printf("%05u %5lld", sum, (nbytes+BUFSIZ-1)/BUFSIZ);
if(argc > 2)
printf(" %s", argv[i]);
printf("\n");
fclose(f);
} while(++i < argc);
exit(errflg);
}