/********************************************************************** * Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. * * All Rights Reserved. * * Reference "/usr/src/COPYRIGHT" for applicable restrictions. * **********************************************************************/ /* * Sum bytes in file mod 2^16 */ static char Sccsid[] = "@(#)sum.c 3.0 4/22/86"; #include <stdio.h> #include <sys/param.h> /* for BSIZE */ main(argc,argv) char **argv; { register unsigned sum; register i, c; register FILE *f; register 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%6ld", sum, (nbytes+BSIZE-1)/BSIZE); if(argc > 2) printf(" %s", argv[i]); printf("\n"); fclose(f); } while(++i < argc); exit(errflg); }