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