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
45 void check(FILE *);
46 static void usage(void) __dead2;
47
48 int
main(int argc,char * argv[])49 main(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
114 void
check(FILE * stream)115 check(FILE *stream)
116 {
117 if (feof(stream))
118 exit(0);
119 if (ferror(stream))
120 err(1, "%s", stream == stdin ? "stdin" : "stdout");
121 }
122
123 void
usage(void)124 usage(void)
125 {
126 (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
127 exit(1);
128 }
129
130