1 /* $NetBSD: tabs.c,v 1.6 2021/08/27 18:28:41 rillig Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Roy Marples.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 2008 \
35 The NetBSD Foundation, inc. All rights reserved.");
36 __RCSID("$NetBSD: tabs.c,v 1.6 2021/08/27 18:28:41 rillig Exp $");
37 #endif /* not lint */
38
39 #include <sys/ioctl.h>
40 #include <sys/types.h>
41
42 #include <ctype.h>
43 #include <err.h>
44 #include <errno.h>
45 #include <limits.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <term.h>
50 #include <unistd.h>
51
52 #define NSTOPS 20
53
54 struct tabspec {
55 const char *opt;
56 const char *spec;
57 };
58 static const struct tabspec tabspecs[] = {
59 {"a", "1,10,16,36,72"},
60 {"a2", "1,10,16,40,72"},
61 {"c", "1,8,12,16,20,55"},
62 {"c2", "1,6,10,14,49"},
63 {"c3", "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67"},
64 {"f", "1,7,11,15,19,23"},
65 {"p", "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61"},
66 {"s", "1,10,55"},
67 {"u", "1,12,20,44"}
68 };
69 static const size_t ntabspecs = sizeof(tabspecs) / sizeof(tabspecs[0]);
70
71 __dead static void
usage(void)72 usage(void)
73 {
74 fprintf(stderr,
75 "usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]]"
76 " [-T type]\n"
77 " tabs [-T type] [+[n]] n1[,n2,...]\n");
78 exit(EXIT_FAILURE);
79 /* NOTREACHED */
80 }
81
82 int
main(int argc,char ** argv)83 main(int argc, char **argv)
84 {
85 char *term, *arg, *token, *end, *tabs = NULL, *p;
86 const char *cr, *spec = NULL;
87 int i, n, inc = 8, stops[NSTOPS], nstops, last, cols, margin = 0;
88 long num = 0;
89 size_t j;
90 struct winsize ws;
91
92 term = getenv("TERM");
93 for (i = 1; i < argc; i++) {
94 if (argv[i][0] == '+') {
95 arg = argv[i] + 1;
96 if (arg[0] == 'm')
97 arg++;
98 if (arg[0] == '\0')
99 margin = 10;
100 else {
101 errno = 0;
102 num = strtol(arg, &end, 10);
103 if (errno != 0 || *end != '\0' ||
104 num < 0 || num > INT_MAX)
105 errx(EXIT_FAILURE,
106 "%s: invalid margin", arg);
107 margin = (int)num;
108 }
109 continue;
110 }
111 if (argv[i][0] != '-') {
112 tabs = argv[i];
113 break;
114 }
115 arg = argv[i] + 1;
116 if (arg[0] == '\0')
117 usage();
118 if (arg[0] == '-' && arg[1] == '\0') {
119 if (argv[i + 1] != NULL)
120 tabs = argv[i + 1];
121 break;
122 }
123 if (arg[0] == 'T' && arg[1] == '\0') {
124 term = argv[++i];
125 if (term == NULL)
126 usage();
127 continue;
128 }
129 if (isdigit((unsigned char)arg[0])) {
130 if (arg[1] != '\0')
131 errx(EXIT_FAILURE,
132 "%s: invalid increment", arg);
133 inc = arg[0] - '0';
134 continue;
135 }
136 for (j = 0; j < ntabspecs; j++) {
137 if (arg[0] == tabspecs[j].opt[0] &&
138 arg[1] == tabspecs[j].opt[1]) {
139 spec = tabspecs[j].spec;
140 break;
141 }
142 }
143 if (j == ntabspecs)
144 usage();
145 }
146 if (tabs == NULL && spec != NULL)
147 tabs = strdup(spec);
148
149 if (tabs != NULL)
150 last = nstops = 0;
151 else
152 nstops = -1;
153 p = tabs;
154 while ((token = strsep(&p, ", ")) != NULL) {
155 if (*token == '\0')
156 continue;
157 if (nstops >= NSTOPS)
158 errx(EXIT_FAILURE,
159 "too many tab stops (max %d)", NSTOPS);
160 errno = 0;
161 num = strtol(token, &end, 10);
162 if (errno != 0 || *end != '\0' || num <= 0 || num > INT_MAX)
163 errx(EXIT_FAILURE, "%s: invalid tab stop", token);
164 n = (int)num;
165 if (*token == '+') {
166 if (nstops == 0)
167 errx(EXIT_FAILURE,
168 "first tab stop may not be relative");
169 n += last;
170 }
171 if (last > n)
172 errx(EXIT_FAILURE, "tab stops may not go backwards");
173 last = stops[nstops++] = n;
174 }
175
176 if (term == NULL)
177 errx(EXIT_FAILURE, "no value for $TERM and -T not given");
178 if (setupterm(term, STDOUT_FILENO, NULL) != 0)
179 err(EXIT_FAILURE, "setupterm:");
180 cr = carriage_return;
181 if (cr == NULL)
182 cr = "\r";
183 if (clear_all_tabs == NULL)
184 errx(EXIT_FAILURE, "terminal cannot clear tabs");
185 if (set_tab == NULL)
186 errx(EXIT_FAILURE, "terminal cannot set tabs");
187
188 /* Clear existing tabs */
189 putp(cr);
190 putp(clear_all_tabs);
191 putp(cr);
192
193 if (set_lr_margin != NULL) {
194 printf("%*s", margin, "");
195 putp(set_lr_margin);
196 } else if (margin != 0)
197 warnx("terminal cannot set left margin");
198
199 if (nstops >= 0) {
200 printf("%*s", stops[0] - 1, "");
201 putp(set_tab);
202 for (i = 1; i < nstops; i++) {
203 printf("%*s", stops[i] - stops[i - 1], "");
204 putp(set_tab);
205 }
206 } else if (inc > 0) {
207 cols = 0;
208 term = getenv("COLUMNS");
209 if (term != NULL) {
210 errno = 0;
211 num = strtol(term, &end, 10);
212 if (errno == 0 && *end == '\0' &&
213 0 <= cols && cols <= INT_MAX)
214 cols = (int)num;
215 }
216 if (cols == 0) {
217 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0)
218 cols = ws.ws_col;
219 else {
220 cols = tigetnum("cols");
221 if (cols == 0) {
222 cols = 80;
223 warnx("terminal does not specify number"
224 "columns; defaulting to %d",
225 cols);
226 }
227 }
228 }
229 for (i = 0; i < cols / inc; i++) {
230 printf("%*s", inc, "");
231 putp(set_tab);
232 }
233 }
234 putp(cr);
235
236 exit(EXIT_SUCCESS);
237 /* NOTREACHED */
238 }
239