138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/* $NetBSD: colrm.c,v 1.8 2008/07/21 14:19:21 lukem Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1991, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
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#endif
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__RCSID("$NetBSD: colrm.c,v 1.8 2008/07/21 14:19:21 lukem Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define TAB 8
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void check(FILE *);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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u_long column, start, stop;
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int ch;
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char *p;
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while ((ch = getopt(argc, argv, "")) != -1)
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switch(ch) {
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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start = stop = 0;
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switch(argc) {
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case 2:
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stop = strtol(argv[1], &p, 10);
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if (stop <= 0 || *p)
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errx(1, "illegal column -- %s", argv[1]);
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/* FALLTHROUGH */
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case 1:
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start = strtol(argv[0], &p, 10);
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if (start <= 0 || *p)
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errx(1, "illegal column -- %s", argv[0]);
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break;
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case 0:
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break;
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default:
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usage();
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}
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if (stop && start > stop)
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err(1, "illegal start and stop columns");
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for (column = 0;;) {
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switch (ch = getchar()) {
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case EOF:
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check(stdin);
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break;
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case '\b':
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if (column)
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--column;
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break;
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case '\n':
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column = 0;
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break;
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case '\t':
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column = (column + TAB) & ~(TAB - 1);
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break;
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default:
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++column;
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break;
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}
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if ((!start || column < start || (stop && column > stop)) &&
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putchar(ch) == EOF)
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check(stdout);
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}
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}
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void
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check(FILE *stream)
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{
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if (feof(stream))
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exit(0);
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if (ferror(stream))
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err(1, "%s", stream == stdin ? "stdin" : "stdout");
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
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exit(1);
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}
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