1cba05ee8f
When the load is "high" (an arbitrary value) top(1) previously moved the cursor to the top-left of the screen as an acknowledgment. In practice, on modern machines, even relatively slow ones, it looked more like a glitch. Remove the logic.
316 lines
6.5 KiB
C
316 lines
6.5 KiB
C
/*
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* Top users/processes display for Unix
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* Version 3
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*
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* This program may be freely redistributed,
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* but this entire comment MUST remain intact.
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*
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* Copyright (c) 1984, 1989, William LeFebvre, Rice University
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* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
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*
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* $FreeBSD$
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*/
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/* This file contains the routines that interface to termcap and stty/gtty.
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*
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* Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
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*
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* I put in code to turn on the TOSTOP bit while top was running, but I
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* didn't really like the results. If you desire it, turn on the
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* preprocessor variable "TOStop". --wnl
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*/
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <curses.h>
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#include <termcap.h>
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#include <unistd.h>
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#include "screen.h"
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#include "top.h"
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int overstrike;
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int screen_length;
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int screen_width;
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char ch_erase;
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char ch_kill;
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char smart_terminal;
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static char termcap_buf[1024];
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static char string_buffer[1024];
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static char home[15];
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static char lower_left[15];
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char *clear_line;
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static char *clear_screen;
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char *clear_to_end;
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char *cursor_motion;
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static char *start_standout;
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static char *end_standout;
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static char *terminal_init;
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static char *terminal_end;
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static struct termios old_settings;
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static struct termios new_settings;
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static char is_a_terminal = false;
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void
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init_termcap(bool interactive)
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{
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char *bufptr;
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char *PCptr;
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char *term_name;
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int status;
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/* set defaults in case we aren't smart */
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screen_width = MAX_COLS;
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screen_length = 0;
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if (!interactive)
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{
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/* pretend we have a dumb terminal */
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smart_terminal = false;
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return;
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}
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/* assume we have a smart terminal until proven otherwise */
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smart_terminal = true;
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/* get the terminal name */
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term_name = getenv("TERM");
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/* if there is no TERM, assume it's a dumb terminal */
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/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
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if (term_name == NULL)
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{
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smart_terminal = false;
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return;
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}
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/* now get the termcap entry */
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if ((status = tgetent(termcap_buf, term_name)) != 1)
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{
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if (status == -1)
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{
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fprintf(stderr, "%s: can't open termcap file\n", myname);
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}
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else
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{
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fprintf(stderr, "%s: no termcap entry for a `%s' terminal\n",
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myname, term_name);
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}
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/* pretend it's dumb and proceed */
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smart_terminal = false;
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return;
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}
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/* "hardcopy" immediately indicates a very stupid terminal */
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if (tgetflag("hc"))
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{
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smart_terminal = false;
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return;
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}
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/* set up common terminal capabilities */
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if ((screen_length = tgetnum("li")) <= 0)
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{
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screen_length = smart_terminal = 0;
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return;
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}
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/* screen_width is a little different */
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if ((screen_width = tgetnum("co")) == -1)
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{
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screen_width = 79;
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}
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else
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{
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screen_width -= 1;
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}
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/* terminals that overstrike need special attention */
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overstrike = tgetflag("os");
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/* initialize the pointer into the termcap string buffer */
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bufptr = string_buffer;
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/* get "ce", clear to end */
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if (!overstrike)
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{
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clear_line = tgetstr("ce", &bufptr);
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}
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/* get necessary capabilities */
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if ((clear_screen = tgetstr("cl", &bufptr)) == NULL ||
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(cursor_motion = tgetstr("cm", &bufptr)) == NULL)
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{
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smart_terminal = false;
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return;
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}
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/* get some more sophisticated stuff -- these are optional */
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clear_to_end = tgetstr("cd", &bufptr);
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terminal_init = tgetstr("ti", &bufptr);
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terminal_end = tgetstr("te", &bufptr);
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start_standout = tgetstr("so", &bufptr);
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end_standout = tgetstr("se", &bufptr);
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/* pad character */
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PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;
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/* set convenience strings */
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strncpy(home, tgoto(cursor_motion, 0, 0), sizeof(home) - 1);
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home[sizeof(home) - 1] = '\0';
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/* (lower_left is set in get_screensize) */
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/* get the actual screen size with an ioctl, if needed */
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/* This may change screen_width and screen_length, and it always
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sets lower_left. */
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get_screensize();
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/* if stdout is not a terminal, pretend we are a dumb terminal */
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if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
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{
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smart_terminal = false;
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}
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}
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void
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init_screen(void)
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{
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/* get the old settings for safe keeping */
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if (tcgetattr(STDOUT_FILENO, &old_settings) != -1)
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{
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/* copy the settings so we can modify them */
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new_settings = old_settings;
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/* turn off ICANON, character echo and tab expansion */
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new_settings.c_lflag &= ~(ICANON|ECHO);
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new_settings.c_oflag &= ~(TAB3);
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
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/* remember the erase and kill characters */
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ch_erase = old_settings.c_cc[VERASE];
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ch_kill = old_settings.c_cc[VKILL];
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/* remember that it really is a terminal */
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is_a_terminal = true;
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/* send the termcap initialization string */
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putcap(terminal_init);
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}
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if (!is_a_terminal)
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{
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/* not a terminal at all---consider it dumb */
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smart_terminal = false;
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}
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}
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void
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end_screen(void)
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{
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/* move to the lower left, clear the line and send "te" */
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if (smart_terminal)
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{
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putcap(lower_left);
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putcap(clear_line);
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fflush(stdout);
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putcap(terminal_end);
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}
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/* if we have settings to reset, then do so */
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if (is_a_terminal)
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{
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tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
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}
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}
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void
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reinit_screen(void)
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{
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/* install our settings if it is a terminal */
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if (is_a_terminal)
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{
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tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
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}
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/* send init string */
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if (smart_terminal)
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{
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putcap(terminal_init);
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}
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}
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void
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get_screensize(void)
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{
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struct winsize ws;
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if (ioctl (1, TIOCGWINSZ, &ws) != -1)
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{
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if (ws.ws_row != 0)
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{
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screen_length = ws.ws_row;
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}
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if (ws.ws_col != 0)
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{
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screen_width = ws.ws_col - 1;
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}
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}
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(void) strncpy(lower_left, tgoto(cursor_motion, 0, screen_length - 1),
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sizeof(lower_left) - 1);
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lower_left[sizeof(lower_left) - 1] = '\0';
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}
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void
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top_standout(const char *msg)
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{
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if (smart_terminal)
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{
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putcap(start_standout);
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fputs(msg, stdout);
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putcap(end_standout);
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}
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else
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{
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fputs(msg, stdout);
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}
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}
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void
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top_clear(void)
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{
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if (smart_terminal)
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{
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putcap(clear_screen);
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}
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}
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int
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clear_eol(int len)
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{
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if (smart_terminal && !overstrike && len > 0)
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{
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if (clear_line)
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{
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putcap(clear_line);
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return(0);
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}
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else
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{
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while (len-- > 0)
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{
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putchar(' ');
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}
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return(1);
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}
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}
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return(-1);
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}
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