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#include <sys/types.h>
33#include <err.h>
34#include <errno.h>
35#include <limits.h>
36#include <locale.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41#include <wchar.h>
42
43#define	TAB	8
44
45void check(FILE *);
46static void usage(void) __dead2;
47
48int
49main(int argc, char *argv[])
50{
51	u_long column, start, stop;
52	int ch, width;
53	char *p;
54
55	setlocale(LC_ALL, "");
56
57	while ((ch = getopt(argc, argv, "")) != -1)
58		switch(ch) {
59		case '?':
60		default:
61			usage();
62		}
63	argc -= optind;
64	argv += optind;
65
66	start = stop = 0;
67	switch(argc) {
68	case 2:
69		stop = strtol(argv[1], &p, 10);
70		if (stop <= 0 || *p)
71			errx(1, "illegal column -- %s", argv[1]);
72		/* FALLTHROUGH */
73	case 1:
74		start = strtol(argv[0], &p, 10);
75		if (start <= 0 || *p)
76			errx(1, "illegal column -- %s", argv[0]);
77		break;
78	case 0:
79		break;
80	default:
81		usage();
82	}
83
84	if (stop && start > stop)
85		errx(1, "illegal start and stop columns");
86
87	for (column = 0;;) {
88		switch (ch = getwchar()) {
89		case WEOF:
90			check(stdin);
91			break;
92		case '\b':
93			if (column)
94				--column;
95			break;
96		case '\n':
97			column = 0;
98			break;
99		case '\t':
100			column = (column + TAB) & ~(TAB - 1);
101			break;
102		default:
103			if ((width = wcwidth(ch)) > 0)
104				column += width;
105			break;
106		}
107
108		if ((!start || column < start || (stop && column > stop)) &&
109		    putwchar(ch) == WEOF)
110			check(stdout);
111	}
112}
113
114void
115check(FILE *stream)
116{
117	if (feof(stream))
118		exit(0);
119	if (ferror(stream))
120		err(1, "%s", stream == stdin ? "stdin" : "stdout");
121}
122
123void
124usage(void)
125{
126	(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
127	exit(1);
128}
129
130