This is screen.c in view mode; [Download] [Up]
/*
* Top users/processes display for Unix
* Version 3
*
* This program may be freely redistributed,
* but this entire comment MUST remain intact.
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*/
/* This file contains the routines that interface to termcap and stty/gtty.
*
* Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
*
* I put in code to turn on the TOSTOP bit while top was running, but I
* didn't really like the results. If you desire it, turn on the
* preprocessor variable "TOStop". --wnl
*/
#include "os.h"
#include "top.h"
#include <sys/ioctl.h>
#ifdef CBREAK
# include <sgtty.h>
# define SGTTY
#else
# ifdef TCGETA
# define TERMIO
# include <termio.h>
# else
# define TERMIOS
# include <termios.h>
# endif
#endif
#if defined(TERMIO) || defined(TERMIOS)
# ifndef TAB3
# ifdef OXTABS
# define TAB3 OXTABS
# else
# define TAB3 0
# endif
# endif
#endif
#include "screen.h"
#include "boolean.h"
extern char *myname;
int putstdout();
int overstrike;
int screen_length;
int screen_width;
char ch_erase;
char ch_kill;
char smart_terminal;
char PC;
char *tgetstr();
char *tgoto();
char termcap_buf[1024];
char string_buffer[1024];
char home[15];
char lower_left[15];
char *clear_line;
char *clear_screen;
char *clear_to_end;
char *cursor_motion;
char *start_standout;
char *end_standout;
char *terminal_init;
char *terminal_end;
short ospeed;
#ifdef SGTTY
static struct sgttyb old_settings;
static struct sgttyb new_settings;
#endif
#ifdef TERMIO
static struct termio old_settings;
static struct termio new_settings;
#endif
#ifdef TERMIOS
static struct termios old_settings;
static struct termios new_settings;
#endif
static char is_a_terminal = No;
#ifdef TOStop
static int old_lword;
static int new_lword;
#endif
#define STDIN 0
#define STDOUT 1
#define STDERR 2
init_termcap(interactive)
int interactive;
{
char *bufptr;
char *PCptr;
char *term_name;
char *getenv();
int status;
/* set defaults in case we aren't smart */
screen_width = MAX_COLS;
screen_length = 0;
if (!interactive)
{
/* pretend we have a dumb terminal */
smart_terminal = No;
return;
}
/* assume we have a smart terminal until proven otherwise */
smart_terminal = Yes;
/* get the terminal name */
term_name = getenv("TERM");
/* if there is no TERM, assume it's a dumb terminal */
/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
if (term_name == NULL)
{
smart_terminal = No;
return;
}
/* now get the termcap entry */
if ((status = tgetent(termcap_buf, term_name)) != 1)
{
if (status == -1)
{
fprintf(stderr, "%s: can't open termcap file\n", myname);
}
else
{
fprintf(stderr, "%s: no termcap entry for a `%s' terminal\n",
myname, term_name);
}
/* pretend it's dumb and proceed */
smart_terminal = No;
return;
}
/* "hardcopy" immediately indicates a very stupid terminal */
if (tgetflag("hc"))
{
smart_terminal = No;
return;
}
/* set up common terminal capabilities */
if ((screen_length = tgetnum("li")) <= 0)
{
screen_length = smart_terminal = 0;
return;
}
/* screen_width is a little different */
if ((screen_width = tgetnum("co")) == -1)
{
screen_width = 79;
}
else
{
screen_width -= 1;
}
/* terminals that overstrike need special attention */
overstrike = tgetflag("os");
/* initialize the pointer into the termcap string buffer */
bufptr = string_buffer;
/* get "ce", clear to end */
if (!overstrike)
{
clear_line = tgetstr("ce", &bufptr);
}
/* get necessary capabilities */
if ((clear_screen = tgetstr("cl", &bufptr)) == NULL ||
(cursor_motion = tgetstr("cm", &bufptr)) == NULL)
{
smart_terminal = No;
return;
}
/* get some more sophisticated stuff -- these are optional */
clear_to_end = tgetstr("cd", &bufptr);
terminal_init = tgetstr("ti", &bufptr);
terminal_end = tgetstr("te", &bufptr);
start_standout = tgetstr("so", &bufptr);
end_standout = tgetstr("se", &bufptr);
/* pad character */
PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;
/* set convenience strings */
(void) strcpy(home, tgoto(cursor_motion, 0, 0));
/* (lower_left is set in get_screensize) */
/* get the actual screen size with an ioctl, if needed */
/* This may change screen_width and screen_length, and it always
sets lower_left. */
get_screensize();
/* if stdout is not a terminal, pretend we are a dumb terminal */
#ifdef SGTTY
if (ioctl(STDOUT, TIOCGETP, &old_settings) == -1)
{
smart_terminal = No;
}
#endif
#ifdef TERMIO
if (ioctl(STDOUT, TCGETA, &old_settings) == -1)
{
smart_terminal = No;
}
#endif
#ifdef TERMIOS
if (tcgetattr(STDOUT, &old_settings) == -1)
{
smart_terminal = No;
}
#endif
}
init_screen()
{
/* get the old settings for safe keeping */
#ifdef SGTTY
if (ioctl(STDOUT, TIOCGETP, &old_settings) != -1)
{
/* copy the settings so we can modify them */
new_settings = old_settings;
/* turn on CBREAK and turn off character echo and tab expansion */
new_settings.sg_flags |= CBREAK;
new_settings.sg_flags &= ~(ECHO|XTABS);
(void) ioctl(STDOUT, TIOCSETP, &new_settings);
/* remember the erase and kill characters */
ch_erase = old_settings.sg_erase;
ch_kill = old_settings.sg_kill;
#ifdef TOStop
/* get the local mode word */
(void) ioctl(STDOUT, TIOCLGET, &old_lword);
/* modify it */
new_lword = old_lword | LTOSTOP;
(void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
/* remember that it really is a terminal */
is_a_terminal = Yes;
/* send the termcap initialization string */
putcap(terminal_init);
}
#endif
#ifdef TERMIO
if (ioctl(STDOUT, TCGETA, &old_settings) != -1)
{
/* copy the settings so we can modify them */
new_settings = old_settings;
/* turn off ICANON, character echo and tab expansion */
new_settings.c_lflag &= ~(ICANON|ECHO);
new_settings.c_oflag &= ~(TAB3);
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
(void) ioctl(STDOUT, TCSETA, &new_settings);
/* remember the erase and kill characters */
ch_erase = old_settings.c_cc[VERASE];
ch_kill = old_settings.c_cc[VKILL];
/* remember that it really is a terminal */
is_a_terminal = Yes;
/* send the termcap initialization string */
putcap(terminal_init);
}
#endif
#ifdef TERMIOS
if (tcgetattr(STDOUT, &old_settings) != -1)
{
/* copy the settings so we can modify them */
new_settings = old_settings;
/* turn off ICANON, character echo and tab expansion */
new_settings.c_lflag &= ~(ICANON|ECHO);
new_settings.c_oflag &= ~(TAB3);
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
(void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);
/* remember the erase and kill characters */
ch_erase = old_settings.c_cc[VERASE];
ch_kill = old_settings.c_cc[VKILL];
/* remember that it really is a terminal */
is_a_terminal = Yes;
/* send the termcap initialization string */
putcap(terminal_init);
}
#endif
if (!is_a_terminal)
{
/* not a terminal at all---consider it dumb */
smart_terminal = No;
}
}
end_screen()
{
/* move to the lower left, clear the line and send "te" */
if (smart_terminal)
{
putcap(lower_left);
putcap(clear_line);
fflush(stdout);
putcap(terminal_end);
}
/* if we have settings to reset, then do so */
if (is_a_terminal)
{
#ifdef SGTTY
(void) ioctl(STDOUT, TIOCSETP, &old_settings);
#ifdef TOStop
(void) ioctl(STDOUT, TIOCLSET, &old_lword);
#endif
#endif
#ifdef TERMIO
(void) ioctl(STDOUT, TCSETA, &old_settings);
#endif
#ifdef TERMIOS
(void) tcsetattr(STDOUT, TCSADRAIN, &old_settings);
#endif
}
}
reinit_screen()
{
/* install our settings if it is a terminal */
if (is_a_terminal)
{
#ifdef SGTTY
(void) ioctl(STDOUT, TIOCSETP, &new_settings);
#ifdef TOStop
(void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
#endif
#ifdef TERMIO
(void) ioctl(STDOUT, TCSETA, &new_settings);
#endif
#ifdef TERMIOS
(void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);
#endif
}
/* send init string */
if (smart_terminal)
{
putcap(terminal_init);
}
}
get_screensize()
{
#ifdef TIOCGWINSZ
struct winsize ws;
if (ioctl (1, TIOCGWINSZ, &ws) != -1)
{
if (ws.ws_row != 0)
{
screen_length = ws.ws_row;
}
if (ws.ws_col != 0)
{
screen_width = ws.ws_col - 1;
}
}
#else
#ifdef TIOCGSIZE
struct ttysize ts;
if (ioctl (1, TIOCGSIZE, &ts) != -1)
{
if (ts.ts_lines != 0)
{
screen_length = ts.ts_lines;
}
if (ts.ts_cols != 0)
{
screen_width = ts.ts_cols - 1;
}
}
#endif /* TIOCGSIZE */
#endif /* TIOCGWINSZ */
(void) strcpy(lower_left, tgoto(cursor_motion, 0, screen_length - 1));
}
standout(msg)
char *msg;
{
if (smart_terminal)
{
putcap(start_standout);
fputs(msg, stdout);
putcap(end_standout);
}
else
{
fputs(msg, stdout);
}
}
clear()
{
if (smart_terminal)
{
putcap(clear_screen);
}
}
clear_eol(len)
int len;
{
if (smart_terminal && !overstrike && len > 0)
{
if (clear_line)
{
putcap(clear_line);
return(0);
}
else
{
while (len-- > 0)
{
putchar(' ');
}
return(1);
}
}
return(-1);
}
go_home()
{
if (smart_terminal)
{
putcap(home);
}
}
/* This has to be defined as a subroutine for tputs (instead of a macro) */
putstdout(ch)
char ch;
{
putchar(ch);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.