colrm.c revision 23690
11590Srgrimes/*- 21590Srgrimes * Copyright (c) 1991, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 351590Srgrimesstatic char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1991, 1993\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 4123690Speterstatic char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95"; 421590Srgrimes#endif /* not lint */ 431590Srgrimes 441590Srgrimes#include <sys/types.h> 451590Srgrimes#include <limits.h> 461590Srgrimes#include <errno.h> 471590Srgrimes#include <stdio.h> 481590Srgrimes#include <stdlib.h> 491590Srgrimes#include <string.h> 5023690Speter#include <unistd.h> 511590Srgrimes 521590Srgrimes#define TAB 8 531590Srgrimes 541590Srgrimesvoid err __P((const char *, ...)); 551590Srgrimesvoid check __P((FILE *)); 561590Srgrimesvoid usage __P((void)); 571590Srgrimes 581590Srgrimesint 591590Srgrimesmain(argc, argv) 601590Srgrimes int argc; 611590Srgrimes char *argv[]; 621590Srgrimes{ 631590Srgrimes register u_long column, start, stop; 641590Srgrimes register int ch; 651590Srgrimes char *p; 661590Srgrimes 671590Srgrimes while ((ch = getopt(argc, argv, "")) != EOF) 681590Srgrimes switch(ch) { 691590Srgrimes case '?': 701590Srgrimes default: 711590Srgrimes usage(); 721590Srgrimes } 731590Srgrimes argc -= optind; 741590Srgrimes argv += optind; 751590Srgrimes 761590Srgrimes start = stop = 0; 771590Srgrimes switch(argc) { 781590Srgrimes case 2: 791590Srgrimes stop = strtol(argv[1], &p, 10); 801590Srgrimes if (stop <= 0 || *p) 811590Srgrimes err("illegal column -- %s", argv[1]); 821590Srgrimes /* FALLTHROUGH */ 831590Srgrimes case 1: 841590Srgrimes start = strtol(argv[0], &p, 10); 851590Srgrimes if (start <= 0 || *p) 861590Srgrimes err("illegal column -- %s", argv[0]); 871590Srgrimes break; 881590Srgrimes case 0: 891590Srgrimes break; 901590Srgrimes default: 911590Srgrimes usage(); 921590Srgrimes } 931590Srgrimes 941590Srgrimes if (stop && start > stop) 951590Srgrimes err("illegal start and stop columns"); 961590Srgrimes 971590Srgrimes for (column = 0;;) { 981590Srgrimes switch (ch = getchar()) { 991590Srgrimes case EOF: 1001590Srgrimes check(stdin); 1011590Srgrimes break; 1021590Srgrimes case '\b': 1031590Srgrimes if (column) 1041590Srgrimes --column; 1051590Srgrimes break; 1061590Srgrimes case '\n': 1071590Srgrimes column = 0; 1081590Srgrimes break; 1091590Srgrimes case '\t': 1101590Srgrimes column = (column + TAB) & ~(TAB - 1); 1111590Srgrimes break; 1121590Srgrimes default: 1131590Srgrimes ++column; 1141590Srgrimes break; 1151590Srgrimes } 1161590Srgrimes 1171590Srgrimes if ((!start || column < start || stop && column > stop) && 1181590Srgrimes putchar(ch) == EOF) 1191590Srgrimes check(stdout); 1201590Srgrimes } 1211590Srgrimes} 1221590Srgrimes 1231590Srgrimesvoid 1241590Srgrimescheck(stream) 1251590Srgrimes FILE *stream; 1261590Srgrimes{ 1271590Srgrimes if (feof(stream)) 1281590Srgrimes exit(0); 1291590Srgrimes if (ferror(stream)) 1301590Srgrimes err("%s: %s", 1311590Srgrimes stream == stdin ? "stdin" : "stdout", strerror(errno)); 1321590Srgrimes} 1331590Srgrimes 1341590Srgrimesvoid 1351590Srgrimesusage() 1361590Srgrimes{ 1371590Srgrimes (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 1381590Srgrimes exit(1); 1391590Srgrimes} 1401590Srgrimes 1411590Srgrimes#if __STDC__ 1421590Srgrimes#include <stdarg.h> 1431590Srgrimes#else 1441590Srgrimes#include <varargs.h> 1451590Srgrimes#endif 1461590Srgrimes 1471590Srgrimesvoid 1481590Srgrimes#if __STDC__ 1491590Srgrimeserr(const char *fmt, ...) 1501590Srgrimes#else 1511590Srgrimeserr(fmt, va_alist) 1521590Srgrimes char *fmt; 1531590Srgrimes va_dcl 1541590Srgrimes#endif 1551590Srgrimes{ 1561590Srgrimes va_list ap; 1571590Srgrimes#if __STDC__ 1581590Srgrimes va_start(ap, fmt); 1591590Srgrimes#else 1601590Srgrimes va_start(ap); 1611590Srgrimes#endif 1621590Srgrimes (void)fprintf(stderr, "colrm: "); 1631590Srgrimes (void)vfprintf(stderr, fmt, ap); 1641590Srgrimes va_end(ap); 1651590Srgrimes (void)fprintf(stderr, "\n"); 1661590Srgrimes exit(1); 1671590Srgrimes /* NOTREACHED */ 1681590Srgrimes} 169