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/* tterm.c - minimalist information on the terminal
Copyright 1998-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
#include <limits.h>
#include <termios.h>
#include <sys/ioctl.h>
#include "xstrtol.h"
#include "quotearg.h"
#include "error.h"
#include "tterm.h"
struct tterm
{
/* The number of chars per hardware tab stop. Setting this to zero
inhibits the use of TAB characters for separating columns. -T */
size_t tabsize;
/* The line length to use for breaking lines in many-per-line format.
Can be set with -w. */
size_t width;
};
/* Default setting */
static struct tterm tterm_default =
{
8, /* tabsize */
80 /* width */
};
/* Set the line width of TTERM to WIDTH. Returns the previous value. */
size_t
tterm_width_set (struct tterm * tterm, size_t width)
{
struct tterm *t = tterm ? tterm : &tterm_default;
size_t old = t->width;
t->width = width;
return old;
}
/* Return the line width of TTERM. */
size_t
tterm_width (struct tterm * tterm)
{
struct tterm *t = tterm ? tterm : &tterm_default;
return t->width;
}
/* Set the tab size of TTERM to SIZE. Returns the previous value. */
size_t
tterm_tabsize_set (struct tterm * tterm, size_t size)
{
struct tterm *t = tterm ? tterm : &tterm_default;
size_t old = t->tabsize;
t->tabsize = size;
return old;
}
/* Return the tab size of TTERM. */
size_t
tterm_tabsize (struct tterm * tterm)
{
struct tterm *t = tterm ? tterm : &tterm_default;
return t->tabsize;
}
/* Initialize the values taking the environment into account (for line
width, and tabsize). */
void
tterm_initialize (struct tterm *tterm, FILE *stream)
{
const char *cp;
struct tterm *t = tterm ? tterm : &tterm_default;
long int tmp_long;
/* Length of the line. */
if ((cp = getenv ("COLUMNS")) && *cp)
{
if (xstrtol (cp, NULL, 0, &tmp_long, NULL) == LONGINT_OK
&& 0 < tmp_long && tmp_long <= INT_MAX)
t->width = (size_t) tmp_long;
else
{
error (0, 0,
"ignoring invalid width in environment variable COLUMNS: %s",
quotearg (cp));
}
}
#ifdef TIOCGWINSZ
{
struct winsize ws;
if (ioctl (fileno (stream), TIOCGWINSZ, &ws) != -1 && ws.ws_col != 0)
t->width = ws.ws_col;
}
#endif
/* Tabulation size. */
/* Using the TABSIZE environment variable is not POSIX-approved.
Ignore it when POSIXLY_CORRECT is set. */
if (!getenv ("POSIXLY_CORRECT") && (cp = getenv ("TABSIZE")) && *cp)
{
if (xstrtol (cp, NULL, 0, &tmp_long, NULL) == LONGINT_OK
&& 0 <= tmp_long && tmp_long <= INT_MAX)
t->tabsize = (size_t) tmp_long;
else
{
error (0, 0,
"ignoring invalid tab size in environment variable TABSIZE: %s",
quotearg (cp));
}
}
}
/* Sample test of TinyTerm. */
#ifdef TEST
const char * program_name = "tterm";
int
main (int argc, char **argv)
{
tterm_init ();
printf ("Width = %d, Tabsize = %d\n",
tterm_width (NULL), tterm_tabsize (NULL));
return 0;
}
#endif
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