1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1991, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)colrm.c	8.2 (Berkeley) 5/4/95";
43#endif
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: src/usr.bin/colrm/colrm.c,v 1.12 2004/07/29 09:09:22 tjr Exp $");
48
49#include <sys/types.h>
50#include <err.h>
51#include <errno.h>
52#include <limits.h>
53#include <locale.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58#include <wchar.h>
59
60#define	TAB	8
61
62void check(FILE *);
63static void usage(void);
64
65int
66main(int argc, char *argv[])
67{
68	u_long column, start, stop;
69	int ch, width;
70	char *p;
71
72	setlocale(LC_ALL, "");
73
74	while ((ch = getopt(argc, argv, "")) != -1)
75		switch(ch) {
76		case '?':
77		default:
78			usage();
79		}
80	argc -= optind;
81	argv += optind;
82
83	start = stop = 0;
84	switch(argc) {
85	case 2:
86                if(argv[1]) stop = strtol(argv[1], &p, 10);
87		if (stop <= 0 || *p)
88			errx(1, "illegal column -- %s", argv[1]);
89		/* FALLTHROUGH */
90	case 1:
91	        if(argv[0]) start = strtol(argv[0], &p, 10);
92		if (start <= 0 || *p)
93			errx(1, "illegal column -- %s", argv[0]);
94		break;
95	case 0:
96		break;
97	default:
98		usage();
99	}
100
101	if (stop && start > stop)
102		errx(1, "illegal start and stop columns");
103
104	for (column = 0;;) {
105		switch (ch = getwchar()) {
106		case WEOF:
107			check(stdin);
108			break;
109		case '\b':
110			if (column)
111				--column;
112			break;
113		case '\n':
114			column = 0;
115			break;
116		case '\t':
117			column = (column + TAB) & ~(TAB - 1);
118			break;
119		default:
120			if ((width = wcwidth(ch)) > 0)
121				column += width;
122			break;
123		}
124
125		if ((!start || column < start || (stop && column > stop)) &&
126		    putwchar(ch) == WEOF)
127			check(stdout);
128	}
129}
130
131void
132check(FILE *stream)
133{
134	if (feof(stream))
135		exit(0);
136	if (ferror(stream))
137		err(1, "%s", stream == stdin ? "stdin" : "stdout");
138}
139
140void
141usage(void)
142{
143	(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
144	exit(1);
145}
146
147