/* $NetBSD: tabs.c,v 1.5 2019/02/01 08:29:04 mrg Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Roy Marples.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define NSTOPS 20
struct tabspec {
const char *opt;
const char *spec;
};
static const struct tabspec tabspecs[] = {
{"a", "1,10,16,36,72"},
{"a2", "1,10,16,40,72"},
{"c", "1,8,12,16,20,55"},
{"c2", "1,6,10,14,49"},
{"c3", "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67"},
{"f", "1,7,11,15,19,23"},
{"p", "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61"},
{"s", "1,10,55"},
{"u", "1,12,20,44"}
};
static const size_t ntabspecs = sizeof(tabspecs) / sizeof(tabspecs[0]);
static void
usage(void)
{
fprintf(stderr,
"usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]]"
" [-T type]\n"
" tabs [-T type] [+[n]] n1[,n2,...]\n");
exit(EXIT_FAILURE);
/* NOTREACHED */
}
int
main(int argc, char **argv)
{
char *term, *arg, *token, *end, *tabs = NULL, *p;
const char *cr, *spec = NULL;
int i, n, inc = 8, stops[NSTOPS], nstops, last, cols, margin = 0;
size_t j;
struct winsize ws;
term = getenv("TERM");
for (i = 1; i < argc; i++) {
if (argv[i][0] == '+') {
arg = argv[i] + 1;
if (arg[0] == 'm')
arg++;
if (arg[0] == '\0')
margin = 10;
else {
errno = 0;
margin = strtol(arg, &end, 10);
if (errno != 0 || *end != '\0' || margin < 0)
errx(EXIT_FAILURE,
"%s: invalid margin", arg);
}
continue;
}
if (argv[i][0] != '-') {
tabs = argv[i];
break;
}
arg = argv[i] + 1;
if (arg[0] == '\0')
usage();
if (arg[0] == '-' && arg[1] == '\0') {
if (argv[i + 1] != NULL)
tabs = argv[i + 1];
break;
}
if (arg[0] == 'T' && arg[1] == '\0') {
term = argv[++i];
if (term == NULL)
usage();
continue;
}
if (isdigit((int)arg[0])) {
if (arg[1] != '\0')
errx(EXIT_FAILURE,
"%s: invalid increament", arg);
inc = arg[0] - '0';
continue;
}
for (j = 0; j < ntabspecs; j++) {
if (arg[0] == tabspecs[j].opt[0] &&
arg[1] == tabspecs[j].opt[1]) {
spec = tabspecs[j].spec;
break;
}
}
if (j == ntabspecs)
usage();
}
if (tabs == NULL && spec != NULL)
tabs = strdup(spec);
if (tabs != NULL)
last = nstops = 0;
else
nstops = -1;
p = tabs;
while ((token = strsep(&p, ", ")) != NULL) {
if (*token == '\0')
continue;
if (nstops >= NSTOPS)
errx(EXIT_FAILURE,
"too many tab stops (max %d)", NSTOPS);
errno = 0;
n = strtol(token, &end, 10);
if (errno != 0 || *end != '\0' || n <= 0)
errx(EXIT_FAILURE, "%s: invalid tab stop", token);
if (*token == '+') {
if (nstops == 0)
errx(EXIT_FAILURE,
"first tab stop may not be relative");
n += last;
}
if (last > n)
errx(EXIT_FAILURE, "tab stops may not go backwards");
last = stops[nstops++] = n;
}
if (term == NULL)
errx(EXIT_FAILURE, "no value for $TERM and -T not given");
if (setupterm(term, STDOUT_FILENO, NULL) != 0)
err(EXIT_FAILURE, "setupterm:");
cr = carriage_return;
if (cr == NULL)
cr = "\r";
if (clear_all_tabs == NULL)
errx(EXIT_FAILURE, "terminal cannot clear tabs");
if (set_tab == NULL)
errx(EXIT_FAILURE, "terminal cannot set tabs");
/* Clear existing tabs */
putp(cr);
putp(clear_all_tabs);
putp(cr);
if (set_lr_margin != NULL) {
printf("%*s", margin, "");
putp(set_lr_margin);
} else if (margin != 0)
warnx("terminal cannot set left margin");
if (nstops >= 0) {
printf("%*s", stops[0] - 1, "");
putp(set_tab);
for (i = 1; i < nstops; i++) {
printf("%*s", stops[i] - stops[i - 1], "");
putp(set_tab);
}
} else if (inc > 0) {
cols = 0;
term = getenv("COLUMNS");
if (term != NULL) {
errno = 0;
cols = strtol(term, &end, 10);
if (errno != 0 || *end != '\0' || cols < 0)
cols = 0;
}
if (cols == 0) {
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0)
cols = ws.ws_col;
else {
cols = tigetnum("cols");
if (cols == 0) {
cols = 80;
warnx("terminal does not specify number"
"columns; defaulting to %d",
cols);
}
}
}
for (i = 0; i < cols / inc; i++) {
printf("%*s", inc, "");
putp(set_tab);
}
}
putp(cr);
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
