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88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* $Id: ttysize.c,v 1.2 2019/07/25 00:07:15 tom Exp $
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*
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* ttysize.c -- obtain terminal-size for dialog
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*
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* Copyright 2018,2019 Thomas E. Dickey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License, version 2.1
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to
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* Free Software Foundation, Inc.
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* 51 Franklin St., Fifth Floor
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* Boston, MA 02110, USA.
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*
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* An earlier version of this program lists as authors
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* Savio Lam (lam836@cs.cuhk.hk)
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*/
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#include <dialog.h>
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/*
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* This is based on work I did for ncurses in 1997, and improved/extended for
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* other terminal-based programs. The comments are from my original version -TD
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*/
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#ifdef NEED_PTEM_H
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/* On SCO, they neglected to define struct winsize in termios.h -- it's only
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* in termio.h and ptem.h (the former conflicts with other definitions).
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*/
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# include <sys/stream.h>
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# include <sys/ptem.h>
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#endif
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/*
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* SCO defines TIOCGSIZE and the corresponding struct. Other systems (SunOS,
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* Solaris, IRIX) define TIOCGWINSZ and struct winsize.
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*/
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#if defined(TIOCGSIZE)
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# define IOCTL_WINSIZE TIOCGSIZE
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# define STRUCT_WINSIZE struct ttysize
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# define WINSIZE_ROWS(n) (int)n.ts_lines
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# define WINSIZE_COLS(n) (int)n.ts_cols
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#elif defined(TIOCGWINSZ)
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# define IOCTL_WINSIZE TIOCGWINSZ
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# define STRUCT_WINSIZE struct winsize
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# define WINSIZE_ROWS(n) (int)n.ws_row
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# define WINSIZE_COLS(n) (int)n.ws_col
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#else
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# undef HAVE_SIZECHANGE
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#endif
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int
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dlg_ttysize(int fd, int *high, int *wide)
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{
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int rc = -1;
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#ifdef HAVE_SIZECHANGE
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if (isatty(fd)) {
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STRUCT_WINSIZE size;
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if (ioctl(fd, IOCTL_WINSIZE, &size) >= 0) {
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*high = WINSIZE_ROWS(size);
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*wide = WINSIZE_COLS(size);
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rc = 0;
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}
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}
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#else
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*high = 24;
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*wide = 80;
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#endif /* HAVE_SIZECHANGE */
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return rc;
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}
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