/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* AT&T Research
* return terminal rows and cols
*/
#include <ast.h>
#include <ast_tty.h>
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:hide ioctl sleep
#else
#define ioctl ______ioctl
#define sleep ______sleep
#endif
#if _sys_ioctl
#include <sys/ioctl.h>
#endif
#if defined(TIOCGWINSZ)
#if _sys_stream && _sys_ptem
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
#else
#if !defined(TIOCGSIZE) && !defined(TIOCGWINSZ)
#if _hdr_jioctl
#define jwinsize winsize
#include <jioctl.h>
#else
#if _sys_jioctl
#define jwinsize winsize
#include <sys/jioctl.h>
#endif
#endif
#endif
#endif
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:nohide ioctl sleep
#else
#undef ioctl
#undef sleep
#endif
static int ttctl(int, int, void*);
void
astwinsize(int fd, register int* rows, register int* cols)
{
#ifdef TIOCGWINSZ
#define NEED_ttctl
struct winsize ws;
if (!ttctl(fd, TIOCGWINSZ, &ws) && ws.ws_col > 0 && ws.ws_row > 0)
{
if (rows) *rows = ws.ws_row;
if (cols) *cols = ws.ws_col;
}
else
#else
#ifdef TIOCGSIZE
#define NEED_ttctl
struct ttysize ts;
if (!ttctl(fd, TIOCGSIZE, &ts) && ts.ts_lines > 0 && ts.ts_cols > 0)
{
if (rows) *rows = ts.ts_lines;
if (cols) *cols = ts.ts_cols;
}
else
#else
#ifdef JWINSIZE
#define NEED_ttctl
struct winsize ws;
if (!ttctl(fd, JWINSIZE, &ws) && ws.bytesx > 0 && ws.bytesy > 0)
{
if (rows) *rows = ws.bytesy;
if (cols) *cols = ws.bytesx;
}
else
#endif
#endif
#endif
{
char* s;
if (rows) *rows = (s = getenv("LINES")) ? strtol(s, NiL, 0) : 0;
if (cols) *cols = (s = getenv("COLUMNS")) ? strtol(s, NiL, 0) : 0;
}
}
#ifdef NEED_ttctl
/*
* tty ioctl() -- no cache
*/
static int
ttctl(register int fd, int op, void* tt)
{
register int v;
if (fd < 0)
{
for (fd = 0; fd <= 2; fd++)
if (!ioctl(fd, op, tt)) return(0);
if ((fd = open("/dev/tty", O_RDONLY|O_cloexec)) >= 0)
{
v = ioctl(fd, op, tt);
close(fd);
return(v);
}
}
else if (!ioctl(fd, op, tt)) return(0);
return(-1);
}
#endif