2 * Top users/processes display for Unix
5 * This program may be freely redistributed,
6 * but this entire comment MUST remain intact.
8 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
9 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
14 /* This file contains the routines that interface to termcap and stty/gtty.
16 * Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
18 * I put in code to turn on the TOSTOP bit while top was running, but I
19 * didn't really like the results. If you desire it, turn on the
20 * preprocessor variable "TOStop". --wnl
23 #include <sys/ioctl.h>
42 static char termcap_buf[1024];
43 static char string_buffer[1024];
45 static char lower_left[15];
47 static char *clear_screen;
50 static char *start_standout;
51 static char *end_standout;
52 static char *terminal_init;
53 static char *terminal_end;
55 static struct termios old_settings;
56 static struct termios new_settings;
57 static char is_a_terminal = false;
59 #define NON_INTERACTIVE_MODE_VIRTUAL_SCREEN_WIDTH 1024
62 init_termcap(bool interactive)
74 /* pretend we have a dumb terminal */
75 screen_width = NON_INTERACTIVE_MODE_VIRTUAL_SCREEN_WIDTH;
76 smart_terminal = false;
80 /* assume we have a smart terminal until proven otherwise */
81 smart_terminal = true;
83 /* get the terminal name */
84 term_name = getenv("TERM");
86 /* if there is no TERM, assume it's a dumb terminal */
87 /* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
88 if (term_name == NULL)
90 smart_terminal = false;
94 /* now get the termcap entry */
95 if ((status = tgetent(termcap_buf, term_name)) != 1)
99 warnx("can't open termcap file");
103 warnx("no termcap entry for a `%s' terminal", term_name);
106 /* pretend it's dumb and proceed */
107 smart_terminal = false;
111 /* "hardcopy" immediately indicates a very stupid terminal */
114 smart_terminal = false;
118 /* set up common terminal capabilities */
119 if ((screen_length = tgetnum("li")) <= 0)
121 screen_length = smart_terminal = 0;
125 /* screen_width is a little different */
126 if ((screen_width = tgetnum("co")) == -1)
135 /* terminals that overstrike need special attention */
136 overstrike = tgetflag("os");
138 /* initialize the pointer into the termcap string buffer */
139 bufptr = string_buffer;
141 /* get "ce", clear to end */
144 clear_line = tgetstr("ce", &bufptr);
147 /* get necessary capabilities */
148 if ((clear_screen = tgetstr("cl", &bufptr)) == NULL ||
149 (cursor_motion = tgetstr("cm", &bufptr)) == NULL)
151 smart_terminal = false;
155 /* get some more sophisticated stuff -- these are optional */
156 clear_to_end = tgetstr("cd", &bufptr);
157 terminal_init = tgetstr("ti", &bufptr);
158 terminal_end = tgetstr("te", &bufptr);
159 start_standout = tgetstr("so", &bufptr);
160 end_standout = tgetstr("se", &bufptr);
163 PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;
165 /* set convenience strings */
166 strncpy(home, tgoto(cursor_motion, 0, 0), sizeof(home) - 1);
167 home[sizeof(home) - 1] = '\0';
168 /* (lower_left is set in get_screensize) */
170 /* get the actual screen size with an ioctl, if needed */
171 /* This may change screen_width and screen_length, and it always
175 /* if stdout is not a terminal, pretend we are a dumb terminal */
176 if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
178 smart_terminal = false;
185 /* get the old settings for safe keeping */
186 if (tcgetattr(STDOUT_FILENO, &old_settings) != -1)
188 /* copy the settings so we can modify them */
189 new_settings = old_settings;
191 /* turn off ICANON, character echo and tab expansion */
192 new_settings.c_lflag &= ~(ICANON|ECHO);
193 new_settings.c_oflag &= ~(TAB3);
194 new_settings.c_cc[VMIN] = 1;
195 new_settings.c_cc[VTIME] = 0;
196 tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
198 /* remember the erase and kill characters */
199 ch_erase = old_settings.c_cc[VERASE];
200 ch_kill = old_settings.c_cc[VKILL];
202 /* remember that it really is a terminal */
203 is_a_terminal = true;
205 /* send the termcap initialization string */
206 putcap(terminal_init);
211 /* not a terminal at all---consider it dumb */
212 smart_terminal = false;
219 /* move to the lower left, clear the line and send "te" */
225 putcap(terminal_end);
228 /* if we have settings to reset, then do so */
231 tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
238 /* install our settings if it is a terminal */
241 tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
244 /* send init string */
247 putcap(terminal_init);
256 if (ioctl (1, TIOCGWINSZ, &ws) != -1)
260 screen_length = ws.ws_row;
264 screen_width = ws.ws_col - 1;
269 (void) strncpy(lower_left, tgoto(cursor_motion, 0, screen_length - 1),
270 sizeof(lower_left) - 1);
271 lower_left[sizeof(lower_left) - 1] = '\0';
275 top_standout(const char *msg)
279 putcap(start_standout);
281 putcap(end_standout);
294 putcap(clear_screen);
301 if (smart_terminal && !overstrike && len > 0)