FreeBSD-5.3/usr.bin/tabs/tabs.c
/*-
* Copyright (c) 2002 Tim J. Robbins.
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*/
/*
* tabs -- set terminal tabs
*
* This utility displays a series of characters that clears the terminal
* hardware tab settings, then initialises them to specified values,
* and optionally sets a soft margin.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/tabs/tabs.c,v 1.3 2002/06/08 11:33:22 tjr Exp $");
#include <sys/types.h>
#include <sys/tty.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <term.h>
#include <unistd.h>
/* Maximum number of tab stops allowed in table. */
#define NSTOPS 20
#define NELEMS(a) (sizeof(a) / sizeof(a[0]))
/* Predefined formats, taken from IEEE Std 1003.1-2001. */
static const struct {
const char *name; /* Format name used on cmd. line */
long stops[NSTOPS]; /* Column positions */
} formats[] = {
{ "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 void gettabs(char *, long *, long *);
static int ttywidth(void);
static void usage(void);
int
main(int argc __unused, char *argv[])
{
long cols, i, inc, j, margin, nstops, stops[NSTOPS];
const char *cr, *ct, *st, *ML;
char area[1024], *ap, *arg, *end;
setlocale(LC_ALL, "");
inc = 8;
margin = 0;
nstops = -1;
while ((arg = *++argv) != NULL && (*arg == '-' || *arg == '+')) {
if (*arg == '+') {
/* +m[n] or +[n] */
if (*++arg == 'm')
arg++;
if (*arg != '\0') {
errno = 0;
margin = strtol(arg, &end, 10);
if (errno != 0 || *end != '\0' || margin < 0)
errx(1, "%s: invalid margin width",
arg);
} else
margin = 10;
} else if (isdigit(arg[1])) {
/* -n */
errno = 0;
inc = strtol(arg + 1, &end, 10);
if (errno != 0 || *end != '\0' || inc < 0)
errx(1, "%s: invalid increment", arg + 1);
} else if (arg[1] == 'T') {
/* -Ttype or -T type */
if (arg[2] != '\0')
setenv("TERM", arg + 2, 1);
else {
if ((arg = *++argv) == NULL)
usage();
setenv("TERM", arg, 1);
}
} else if (arg[1] == '-') {
arg = *++argv;
break;
} else {
/* Predefined format */
for (i = 0; i < (int)NELEMS(formats); i++)
if (strcmp(formats[i].name, arg + 1) == 0)
break;
if (i == NELEMS(formats))
usage();
for (j = nstops = 0; j < NSTOPS &&
formats[i].stops[j] != 0; j++)
stops[nstops++] = formats[i].stops[j];
}
}
if (arg != NULL) {
if (nstops != -1)
usage();
gettabs(arg, stops, &nstops);
}
/* Initialise terminal, get the strings we need */
setupterm(NULL, 1, NULL);
ap = area;
if ((ct = tgetstr("ct", &ap)) == NULL)
errx(1, "terminal cannot clear tabs");
if ((st = tgetstr("st", &ap)) == NULL)
errx(1, "terminal cannot set tabs");
if ((cr = tgetstr("cr", &ap)) == NULL)
cr = "\r";
ML = tgetstr("ML", &ap);
cols = ttywidth();
/* Clear all tabs. */
putp(cr);
putp(ct);
/*
* Set soft margin.
* XXX Does this actually work?
*/
if (ML != NULL) {
printf("%*s", (int)margin, "");
putp(ML);
} else if (margin != 0)
warnx("terminal cannot set left margin");
/* Optionally output new tab stops. */
if (nstops >= 0) {
printf("%*s", (int)stops[0] - 1, "");
putp(st);
for (i = 1; i < nstops; i++) {
printf("%*s", (int)(stops[i] - stops[i - 1]), "");
putp(st);
}
} else if (inc > 0) {
for (i = 0; i < cols / inc; i++) {
putp(st);
printf("%*s", (int)inc, "");
}
putp(st);
}
putp(cr);
exit(0);
}
static void
usage(void)
{
fprintf(stderr,
"usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n");
fprintf(stderr,
" tabs [-T type] [+[n]] n1,[n2,...]\n");
exit(1);
}
static void
gettabs(char *arg, long stops[], long *nstops)
{
char *tok, *end;
long last, stop;
for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL;
tok = strtok(NULL, ",")) {
if (*nstops >= NSTOPS)
errx(1, "too many tab stops (limit %d)", NSTOPS);
errno = 0;
stop = strtol(tok, &end, 10);
if (errno != 0 || *end != '\0' || stop <= 0)
errx(1, "%s: invalid tab stop", tok);
if (*tok == '+') {
if (tok == arg)
errx(1, "%s: first tab may not be relative",
tok);
stop += last;
}
if (last > stop)
errx(1, "cannot go backwards");
last = stops[(*nstops)++] = stop;
}
}
static int
ttywidth(void)
{
struct winsize ws;
int width;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
width = ws.ws_col;
else if ((width = tgetnum("co")) == 0) {
width = 80;
warnx("cannot find terminal width; defaulted to %d", width);
}
return (width);
}