2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002 Tim J. Robbins.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * tabs -- set terminal tabs
32 * This utility displays a series of characters that clears the terminal
33 * hardware tab settings, then initialises them to specified values,
34 * and optionally sets a soft margin.
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/types.h>
53 /* Maximum number of tab stops allowed in table. */
56 #define NELEMS(a) (sizeof(a) / sizeof(a[0]))
58 /* Predefined formats, taken from IEEE Std 1003.1-2001. */
60 const char *name; /* Format name used on cmd. line */
61 long stops[NSTOPS]; /* Column positions */
63 { "a", { 1, 10, 16, 36, 72 } },
64 { "a2", { 1, 10, 16, 40, 72 } },
65 { "c", { 1, 8, 12, 16, 20, 55 } },
66 { "c2", { 1, 6, 10, 14, 49 } },
67 { "c3", { 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58,
69 { "f", { 1, 7, 11, 15, 19, 23 } },
70 { "p", { 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57,
72 { "s", { 1, 10, 55 } },
73 { "u", { 1, 12, 20, 44 } }
76 static void gettabs(char *, long *, long *);
77 static int ttywidth(void);
78 static void usage(void);
81 main(int argc __unused, char *argv[])
83 long cols, i, inc, j, margin, nstops, stops[NSTOPS];
84 const char *cr, *ct, *st, *ML;
85 char area[1024], *ap, *arg, *end;
87 setlocale(LC_ALL, "");
92 while ((arg = *++argv) != NULL && (*arg == '-' || *arg == '+')) {
99 margin = strtol(arg, &end, 10);
100 if (errno != 0 || *end != '\0' || margin < 0)
101 errx(1, "%s: invalid margin width",
105 } else if (isdigit(arg[1])) {
108 inc = strtol(arg + 1, &end, 10);
109 if (errno != 0 || *end != '\0' || inc < 0)
110 errx(1, "%s: invalid increment", arg + 1);
111 } else if (arg[1] == 'T') {
112 /* -Ttype or -T type */
114 setenv("TERM", arg + 2, 1);
116 if ((arg = *++argv) == NULL)
118 setenv("TERM", arg, 1);
120 } else if (arg[1] == '-') {
124 /* Predefined format */
125 for (i = 0; i < (int)NELEMS(formats); i++)
126 if (strcmp(formats[i].name, arg + 1) == 0)
128 if (i == NELEMS(formats))
130 for (j = nstops = 0; j < NSTOPS &&
131 formats[i].stops[j] != 0; j++)
132 stops[nstops++] = formats[i].stops[j];
139 gettabs(arg, stops, &nstops);
142 /* Initialise terminal, get the strings we need */
143 setupterm(NULL, 1, NULL);
145 if ((ct = tgetstr("ct", &ap)) == NULL)
146 errx(1, "terminal cannot clear tabs");
147 if ((st = tgetstr("st", &ap)) == NULL)
148 errx(1, "terminal cannot set tabs");
149 if ((cr = tgetstr("cr", &ap)) == NULL)
151 ML = tgetstr("ML", &ap);
154 /* Clear all tabs. */
160 * XXX Does this actually work?
163 printf("%*s", (int)margin, "");
165 } else if (margin != 0)
166 warnx("terminal cannot set left margin");
168 /* Optionally output new tab stops. */
170 printf("%*s", (int)stops[0] - 1, "");
172 for (i = 1; i < nstops; i++) {
173 printf("%*s", (int)(stops[i] - stops[i - 1]), "");
176 } else if (inc > 0) {
177 for (i = 0; i < cols / inc; i++) {
179 printf("%*s", (int)inc, "");
193 "usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n");
195 " tabs [-T type] [+[n]] n1,[n2,...]\n");
200 gettabs(char *arg, long stops[], long *nstops)
205 for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL;
206 tok = strtok(NULL, ",")) {
207 if (*nstops >= NSTOPS)
208 errx(1, "too many tab stops (limit %d)", NSTOPS);
210 stop = strtol(tok, &end, 10);
211 if (errno != 0 || *end != '\0' || stop <= 0)
212 errx(1, "%s: invalid tab stop", tok);
215 errx(1, "%s: first tab may not be relative",
220 errx(1, "cannot go backwards");
221 last = stops[(*nstops)++] = stop;
231 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
233 else if ((width = tgetnum("co")) == 0) {
235 warnx("cannot find terminal width; defaulted to %d", width);