1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1991, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)colrm.c	8.2 (Berkeley) 5/4/95";
41#endif
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <sys/types.h>
48#include <err.h>
49#include <errno.h>
50#include <limits.h>
51#include <locale.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56#include <wchar.h>
57
58#define	TAB	8
59
60void check(FILE *);
61static void usage(void);
62
63int
64main(int argc, char *argv[])
65{
66	u_long column, start, stop;
67	int ch, width;
68	char *p;
69
70	setlocale(LC_ALL, "");
71
72	while ((ch = getopt(argc, argv, "")) != -1)
73		switch(ch) {
74		case '?':
75		default:
76			usage();
77		}
78	argc -= optind;
79	argv += optind;
80
81	start = stop = 0;
82	switch(argc) {
83	case 2:
84		stop = strtol(argv[1], &p, 10);
85		if (stop <= 0 || *p)
86			errx(1, "illegal column -- %s", argv[1]);
87		/* FALLTHROUGH */
88	case 1:
89		start = strtol(argv[0], &p, 10);
90		if (start <= 0 || *p)
91			errx(1, "illegal column -- %s", argv[0]);
92		break;
93	case 0:
94		break;
95	default:
96		usage();
97	}
98
99	if (stop && start > stop)
100		errx(1, "illegal start and stop columns");
101
102	for (column = 0;;) {
103		switch (ch = getwchar()) {
104		case WEOF:
105			check(stdin);
106			break;
107		case '\b':
108			if (column)
109				--column;
110			break;
111		case '\n':
112			column = 0;
113			break;
114		case '\t':
115			column = (column + TAB) & ~(TAB - 1);
116			break;
117		default:
118			if ((width = wcwidth(ch)) > 0)
119				column += width;
120			break;
121		}
122
123		if ((!start || column < start || (stop && column > stop)) &&
124		    putwchar(ch) == WEOF)
125			check(stdout);
126	}
127}
128
129void
130check(FILE *stream)
131{
132	if (feof(stream))
133		exit(0);
134	if (ferror(stream))
135		err(1, "%s", stream == stdin ? "stdin" : "stdout");
136}
137
138void
139usage(void)
140{
141	(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
142	exit(1);
143}
144
145