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screen.c
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screen.c
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/*
* Copyright (C) 1984-2024 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines which deal with the characteristics of the terminal.
* Uses termcap to be as terminal-independent as possible.
*/
#include "less.h"
#include "cmd.h"
#if MSDOS_COMPILER
#include "pckeys.h"
#if MSDOS_COMPILER==MSOFTC
#include <graph.h>
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#include <conio.h>
#if MSDOS_COMPILER==DJGPPC
#include <pc.h>
extern int fd0;
#endif
#else
#if MSDOS_COMPILER==WIN32C
#include <windows.h>
#endif
#endif
#endif
#include <time.h>
#ifndef FOREGROUND_BLUE
#define FOREGROUND_BLUE 0x0001
#endif
#ifndef FOREGROUND_GREEN
#define FOREGROUND_GREEN 0x0002
#endif
#ifndef FOREGROUND_RED
#define FOREGROUND_RED 0x0004
#endif
#ifndef FOREGROUND_INTENSITY
#define FOREGROUND_INTENSITY 0x0008
#endif
#else
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
#include <termios.h>
#else
#if HAVE_TERMIO_H
#include <termio.h>
#else
#if HAVE_SGSTAT_H
#include <sgstat.h>
#else
#include <sgtty.h>
#endif
#endif
#endif
#if HAVE_NCURSESW_TERMCAP_H
#include <ncursesw/termcap.h>
#else
#if HAVE_NCURSES_TERMCAP_H
#include <ncurses/termcap.h>
#else
#if HAVE_TERMCAP_H
#include <termcap.h>
#endif
#endif
#endif
#ifdef _OSK
#include <signal.h>
#endif
#if OS2
#include <sys/signal.h>
#include "pckeys.h"
#endif
#if HAVE_SYS_STREAM_H
#include <sys/stream.h>
#endif
#if HAVE_SYS_PTEM_H
#include <sys/ptem.h>
#endif
#endif /* MSDOS_COMPILER */
/*
* Check for broken termios package that forces you to manually
* set the line discipline.
*/
#ifdef __ultrix__
#define MUST_SET_LINE_DISCIPLINE 1
#else
#define MUST_SET_LINE_DISCIPLINE 0
#endif
#if OS2
#define DEFAULT_TERM "ansi"
static char *windowid;
#else
#define DEFAULT_TERM "unknown"
#endif
#if MSDOS_COMPILER==MSOFTC
static int videopages;
static long msec_loops;
static int flash_created = 0;
#define SET_FG_COLOR(fg) _settextcolor(fg)
#define SET_BG_COLOR(bg) _setbkcolor(bg)
#define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); }
#endif
#if MSDOS_COMPILER==BORLANDC
static unsigned short *whitescreen;
static int flash_created = 0;
#endif
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#define _settextposition(y,x) gotoxy(x,y)
#define _clearscreen(m) clrscr()
#define _outtext(s) cputs(s)
#define SET_FG_COLOR(fg) textcolor(fg)
#define SET_BG_COLOR(bg) textbackground(bg)
#define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); }
extern int sc_height;
#endif
#if MSDOS_COMPILER==WIN32C
#define UTF8_MAX_LENGTH 4
static WORD curr_attr;
static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */
extern int utf_mode;
extern int quitting;
static void win32_init_term();
static void win32_deinit_term();
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 4
#endif
#define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
#define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
#define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4)))
#define APPLY_COLORS() { if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
error("SETCOLORS failed", NULL_PARG); }
#define SET_FG_COLOR(fg) { curr_attr &= ~0x0f; curr_attr |= (fg); APPLY_COLORS(); }
#define SET_BG_COLOR(bg) { curr_attr &= ~0xf0; curr_attr |= ((bg)<<4); APPLY_COLORS(); }
#define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); APPLY_COLORS(); }
#endif
#if MSDOS_COMPILER
public int nm_fg_color = CV_ERROR; /* Color of normal text */
public int nm_bg_color = CV_ERROR;
public int nm_attr = 0;
public int bo_fg_color = CV_ERROR; /* Color of bold text */
public int bo_bg_color = CV_ERROR;
public int bo_attr = 0;
public int ul_fg_color = CV_ERROR; /* Color of underlined text */
public int ul_bg_color = CV_ERROR;
public int ul_attr = 0;
public int so_fg_color = CV_ERROR; /* Color of standout text */
public int so_bg_color = CV_ERROR;
public int so_attr = 0;
public int bl_fg_color = CV_ERROR; /* Color of blinking text */
public int bl_bg_color = CV_ERROR;
public int bl_attr = 0;
static int sy_fg_color; /* Color of system text (before less) */
static int sy_bg_color;
public int sgr_mode; /* Honor ANSI sequences rather than using above */
#if MSDOS_COMPILER==WIN32C
static DWORD init_console_output_mode;
extern DWORD init_console_input_mode;
extern DWORD curr_console_input_mode;
extern DWORD base_console_input_mode;
extern DWORD mouse_console_input_mode;
public int vt_enabled = -1; /* Is virtual terminal processing available? */
#endif
#else
/*
* Strings passed to tputs() to do various terminal functions.
*/
static constant char
*sc_pad, /* Pad string */
*sc_home, /* Cursor home */
*sc_addline, /* Add line, scroll down following lines */
*sc_lower_left, /* Cursor to last line, first column */
*sc_return, /* Cursor to beginning of current line */
*sc_move, /* General cursor positioning */
*sc_clear, /* Clear screen */
*sc_eol_clear, /* Clear to end of line */
*sc_eos_clear, /* Clear to end of screen */
*sc_s_in, /* Enter standout (highlighted) mode */
*sc_s_out, /* Exit standout mode */
*sc_u_in, /* Enter underline mode */
*sc_u_out, /* Exit underline mode */
*sc_b_in, /* Enter bold mode */
*sc_b_out, /* Exit bold mode */
*sc_bl_in, /* Enter blink mode */
*sc_bl_out, /* Exit blink mode */
*sc_visual_bell, /* Visual bell (flash screen) sequence */
*sc_backspace, /* Backspace cursor */
*sc_s_keypad, /* Start keypad mode */
*sc_e_keypad, /* End keypad mode */
*sc_s_mousecap, /* Start mouse capture mode */
*sc_e_mousecap, /* End mouse capture mode */
*sc_init, /* Startup terminal initialization */
*sc_deinit; /* Exit terminal de-initialization */
static int attrcolor = -1;
#endif
static int init_done = 0;
public int auto_wrap; /* Terminal does \r\n when write past margin */
public int ignaw; /* Terminal ignores \n immediately after wrap */
public int erase_char; /* The user's erase char */
public int erase2_char; /* The user's other erase char */
public int kill_char; /* The user's line-kill char */
public int werase_char; /* The user's word-erase char */
public int sc_width, sc_height; /* Height & width of screen */
public int bo_s_width, bo_e_width; /* Printing width of boldface seq */
public int ul_s_width, ul_e_width; /* Printing width of underline seq */
public int so_s_width, so_e_width; /* Printing width of standout seq */
public int bl_s_width, bl_e_width; /* Printing width of blink seq */
public int above_mem, below_mem; /* Memory retained above/below screen */
public int can_goto_line; /* Can move cursor to any line */
public int clear_bg; /* Clear fills with background color */
public int missing_cap = 0; /* Some capability is missing */
public constant char *kent = NULL; /* Keypad ENTER sequence */
public lbool term_init_done = FALSE;
public lbool full_screen = TRUE;
static int attrmode = AT_NORMAL;
static int termcap_debug = -1;
static int no_alt_screen; /* sc_init does not switch to alt screen */
extern int binattr;
extern int one_screen;
#if !MSDOS_COMPILER
static constant char *cheaper(constant char *t1, constant char *t2, constant char *def);
static void tmodes(constant char *incap, constant char *outcap, constant char **instr,
constant char **outstr, constant char *def_instr, constant char *def_outstr, char **spp);
#endif
/*
* These two variables are sometimes defined in,
* and needed by, the termcap library.
*/
#if MUST_DEFINE_OSPEED
extern short ospeed; /* Terminal output baud rate */
extern char PC; /* Pad character */
#endif
#ifdef _OSK
short ospeed;
char PC_, *UP, *BC;
#endif
extern int quiet; /* If VERY_QUIET, use visual bell for bell */
extern int no_vbell;
extern int no_back_scroll;
extern int no_init;
extern int no_keypad;
extern int sigs;
extern int top_scroll;
extern int quit_if_one_screen;
extern int oldbot;
extern int mousecap;
extern int is_tty;
extern int use_color;
#if HILITE_SEARCH
extern int hilite_search;
#endif
#if MSDOS_COMPILER==WIN32C
extern int wscroll;
extern HANDLE tty;
#else
extern int tty;
#endif
#if (HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS) || defined(TCGETA)
/*
* Set termio flags for use by less.
*/
static void set_termio_flags(
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
struct termios *s
#else
struct termio *s
#endif
)
{
s->c_lflag &= ~(0
#ifdef ICANON
| ICANON
#endif
#ifdef ECHO
| ECHO
#endif
#ifdef ECHOE
| ECHOE
#endif
#ifdef ECHOK
| ECHOK
#endif
#ifdef ECHONL
| ECHONL
#endif
);
s->c_oflag |= (0
#ifdef OXTABS
| OXTABS
#else
#ifdef TAB3
| TAB3
#else
#ifdef XTABS
| XTABS
#endif
#endif
#endif
#ifdef OPOST
| OPOST
#endif
#ifdef ONLCR
| ONLCR
#endif
);
s->c_oflag &= ~(0
#ifdef ONOEOT
| ONOEOT
#endif
#ifdef OCRNL
| OCRNL
#endif
#ifdef ONOCR
| ONOCR
#endif
#ifdef ONLRET
| ONLRET
#endif
);
}
#endif
/*
* Change terminal to "raw mode", or restore to "normal" mode.
* "Raw mode" means
* 1. An outstanding read will complete on receipt of a single keystroke.
* 2. Input is not echoed.
* 3. On output, \n is mapped to \r\n.
* 4. \t is NOT expanded into spaces.
* 5. Signal-causing characters such as ctrl-C (interrupt),
* etc. are NOT disabled.
* It doesn't matter whether an input \n is mapped to \r, or vice versa.
*/
public void raw_mode(int on)
{
static int curr_on = 0;
if (on == curr_on)
return;
erase2_char = '\b'; /* in case OS doesn't know about erase2 */
#if LESSTEST
if (is_lesstest())
{
/* {{ For consistent conditions when running tests. }} */
erase_char = '\b';
kill_char = CONTROL('U');
werase_char = CONTROL('W');
} else
#endif /*LESSTEST*/
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
{
struct termios s;
static struct termios save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
if (tcgetattr(tty, &s) < 0)
{
erase_char = '\b';
kill_char = CONTROL('U');
werase_char = CONTROL('W');
} else
{
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
switch (cfgetospeed(&s))
{
#ifdef B0
case B0: ospeed = 0; break;
#endif
#ifdef B50
case B50: ospeed = 1; break;
#endif
#ifdef B75
case B75: ospeed = 2; break;
#endif
#ifdef B110
case B110: ospeed = 3; break;
#endif
#ifdef B134
case B134: ospeed = 4; break;
#endif
#ifdef B150
case B150: ospeed = 5; break;
#endif
#ifdef B200
case B200: ospeed = 6; break;
#endif
#ifdef B300
case B300: ospeed = 7; break;
#endif
#ifdef B600
case B600: ospeed = 8; break;
#endif
#ifdef B1200
case B1200: ospeed = 9; break;
#endif
#ifdef B1800
case B1800: ospeed = 10; break;
#endif
#ifdef B2400
case B2400: ospeed = 11; break;
#endif
#ifdef B4800
case B4800: ospeed = 12; break;
#endif
#ifdef B9600
case B9600: ospeed = 13; break;
#endif
#ifdef EXTA
case EXTA: ospeed = 14; break;
#endif
#ifdef EXTB
case EXTB: ospeed = 15; break;
#endif
#ifdef B57600
case B57600: ospeed = 16; break;
#endif
#ifdef B115200
case B115200: ospeed = 17; break;
#endif
default: ;
}
#endif
erase_char = s.c_cc[VERASE];
#ifdef VERASE2
erase2_char = s.c_cc[VERASE2];
#endif
kill_char = s.c_cc[VKILL];
#ifdef VWERASE
werase_char = s.c_cc[VWERASE];
#else
werase_char = CONTROL('W');
#endif
/*
* Set the modes to the way we want them.
*/
set_termio_flags(&s);
s.c_cc[VMIN] = 1;
s.c_cc[VTIME] = 0;
#ifdef VLNEXT
s.c_cc[VLNEXT] = 0;
#endif
#ifdef VDSUSP
s.c_cc[VDSUSP] = 0;
#endif
#ifdef VSTOP
s.c_cc[VSTOP] = 0;
#endif
#ifdef VSTART
s.c_cc[VSTART] = 0;
#endif
#ifdef VDISCARD
s.c_cc[VDISCARD] = 0;
#endif
#if MUST_SET_LINE_DISCIPLINE
/*
* System's termios is broken; need to explicitly
* request TERMIODISC line discipline.
*/
s.c_line = TERMIODISC;
#endif
}
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
#if HAVE_FSYNC
fsync(tty);
#endif
tcsetattr(tty, TCSADRAIN, &s);
#if MUST_SET_LINE_DISCIPLINE
if (!on)
{
/*
* Broken termios *ignores* any line discipline
* except TERMIODISC. A different old line discipline
* is therefore not restored, yet. Restore the old
* line discipline by hand.
*/
ioctl(tty, TIOCSETD, &save_term.c_line);
}
#endif
}
#else
#ifdef TCGETA
{
struct termio s;
static struct termio save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
ioctl(tty, TCGETA, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
ospeed = s.c_cflag & CBAUD;
#endif
erase_char = s.c_cc[VERASE];
kill_char = s.c_cc[VKILL];
#ifdef VWERASE
werase_char = s.c_cc[VWERASE];
#else
werase_char = CONTROL('W');
#endif
/*
* Set the modes to the way we want them.
*/
set_termio_flags(&s);
s.c_cc[VMIN] = 1;
s.c_cc[VTIME] = 0;
#ifdef VSTOP
s.c_cc[VSTOP] = 0;
#endif
#ifdef VSTART
s.c_cc[VSTART] = 0;
#endif
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
ioctl(tty, TCSETAW, &s);
}
#else
#ifdef TIOCGETP
{
struct sgttyb s;
static struct sgttyb save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
ioctl(tty, TIOCGETP, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
#if HAVE_OSPEED
ospeed = s.sg_ospeed;
#endif
erase_char = s.sg_erase;
kill_char = s.sg_kill;
werase_char = CONTROL('W');
/*
* Set the modes to the way we want them.
*/
s.sg_flags |= CBREAK;
s.sg_flags &= ~(ECHO|XTABS);
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
ioctl(tty, TIOCSETN, &s);
}
#else
#ifdef _OSK
{
struct sgbuf s;
static struct sgbuf save_term;
static int saved_term = 0;
if (on)
{
/*
* Get terminal modes.
*/
_gs_opt(tty, &s);
/*
* Save modes and set certain variables dependent on modes.
*/
if (!saved_term)
{
save_term = s;
saved_term = 1;
}
erase_char = s.sg_bspch;
kill_char = s.sg_dlnch;
werase_char = CONTROL('W');
/*
* Set the modes to the way we want them.
*/
s.sg_echo = 0;
s.sg_eofch = 0;
s.sg_pause = 0;
s.sg_psch = 0;
} else
{
/*
* Restore saved modes.
*/
s = save_term;
}
_ss_opt(tty, &s);
}
#else
/* MS-DOS, Windows, or OS2 */
#if OS2
/* OS2 */
LSIGNAL(SIGINT, SIG_IGN);
#endif
erase_char = '\b';
#if MSDOS_COMPILER==DJGPPC
kill_char = CONTROL('U');
/*
* So that when we shell out or run another program, its
* stdin is in cooked mode. We do not switch stdin to binary
* mode if fd0 is zero, since that means we were called before
* tty was reopened in open_getchr, in which case we would be
* changing the original stdin device outside less.
*/
if (fd0 != 0)
setmode(0, on ? O_BINARY : O_TEXT);
#else
kill_char = ESC;
#endif
werase_char = CONTROL('W');
#endif
#endif
#endif
#endif
curr_on = on;
}
#if !MSDOS_COMPILER
/*
* Some glue to prevent calling termcap functions if tgetent() failed.
*/
static int hardcopy;
static constant char * ltget_env(constant char *capname)
{
char name[64];
if (termcap_debug)
{
struct env { struct env *next; char *name; char *value; };
static struct env *envs = NULL;
struct env *p;
for (p = envs; p != NULL; p = p->next)
if (strcmp(p->name, capname) == 0)
return p->value;
p = (struct env *) ecalloc(1, sizeof(struct env));
p->name = save(capname);
p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
sprintf(p->value, "<%s>", capname);
p->next = envs;
envs = p;
return p->value;
}
SNPRINTF1(name, sizeof(name), "LESS_TERMCAP_%s", capname);
return (lgetenv(name));
}
static int ltgetflag(constant char *capname)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (*s != '\0' && *s != '0');
if (hardcopy)
return (0);
return (tgetflag(capname));
}
static int ltgetnum(constant char *capname)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (atoi(s));
if (hardcopy)
return (-1);
return (tgetnum(capname));
}
static constant char * ltgetstr(constant char *capname, char **pp)
{
constant char *s;
if ((s = ltget_env(capname)) != NULL)
return (s);
if (hardcopy)
return (NULL);
return (tgetstr(capname, pp));
}
#endif /* MSDOS_COMPILER */
/*
* Get size of the output screen.
*/
static void scrsize(void)
{
constant char *s;
int sys_height;
int sys_width;
#if !MSDOS_COMPILER
int n;
#endif
#define DEF_SC_WIDTH 80
#if MSDOS_COMPILER
#define DEF_SC_HEIGHT 25
#else
#define DEF_SC_HEIGHT 24
#endif
sys_width = sys_height = 0;
#if LESSTEST
if (0) /* can't use is_lesstest(): ttyin_name may not be set by scan_option yet */
#endif /*LESSTEST*/
{
#if MSDOS_COMPILER==MSOFTC
{
struct videoconfig w;
_getvideoconfig(&w);
sys_height = w.numtextrows;
sys_width = w.numtextcols;
}
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
{
struct text_info w;
gettextinfo(&w);
sys_height = w.screenheight;
sys_width = w.screenwidth;
}
#else
#if MSDOS_COMPILER==WIN32C
{
CONSOLE_SCREEN_BUFFER_INFO scr;
GetConsoleScreenBufferInfo(con_out, &scr);
sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
}
#else
#if OS2
{
int s[2];
_scrsize(s);
sys_width = s[0];
sys_height = s[1];
/*
* When using terminal emulators for XFree86/OS2, the
* _scrsize function does not work well.
* Call the scrsize.exe program to get the window size.
*/
windowid = getenv("WINDOWID");
if (windowid != NULL)
{
FILE *fd = popen("scrsize", "rt");
if (fd != NULL)
{
int w, h;
fscanf(fd, "%i %i", &w, &h);
if (w > 0 && h > 0)
{
sys_width = w;
sys_height = h;
}
pclose(fd);
}
}
}
#else
#ifdef TIOCGWINSZ
{
struct winsize w;
if (ioctl(2, TIOCGWINSZ, &w) == 0)
{
if (w.ws_row > 0)
sys_height = w.ws_row;
if (w.ws_col > 0)
sys_width = w.ws_col;
}
}
#else
#ifdef WIOCGETD
{
struct uwdata w;
if (ioctl(2, WIOCGETD, &w) == 0)
{
if (w.uw_height > 0)
sys_height = w.uw_height / w.uw_vs;
if (w.uw_width > 0)
sys_width = w.uw_width / w.uw_hs;
}
}
#endif
#endif
#endif
#endif
#endif
#endif
}
if (sys_height > 0)
sc_height = sys_height;
else if ((s = lgetenv("LINES")) != NULL)
sc_height = atoi(s);
#if !MSDOS_COMPILER
else if ((n = ltgetnum("li")) > 0)
sc_height = n;
#endif
if ((s = lgetenv("LESS_LINES")) != NULL)
{
int height = atoi(s);
sc_height = (height < 0) ? sc_height + height : height;
full_screen = FALSE;
}
if (sc_height <= 0)
sc_height = DEF_SC_HEIGHT;
if (sys_width > 0)
sc_width = sys_width;
else if ((s = lgetenv("COLUMNS")) != NULL)
sc_width = atoi(s);
#if !MSDOS_COMPILER
else if ((n = ltgetnum("co")) > 0)
sc_width = n;
#endif
if ((s = lgetenv("LESS_COLUMNS")) != NULL)
{
int width = atoi(s);
sc_width = (width < 0) ? sc_width + width : width;
}
if (sc_width <= 0)
sc_width = DEF_SC_WIDTH;
screen_size_changed();
}
/*
* Recalculate things that depend on the screen size.
*/
public void screen_size_changed(void)
{
calc_jump_sline();
calc_shift_count();
calc_match_shift();
}
#if MSDOS_COMPILER==MSOFTC
/*
* Figure out how many empty loops it takes to delay a millisecond.
*/
static void get_clock(void)
{
clock_t start;
/*
* Get synchronized at the start of a tick.
*/
start = clock();
while (clock() == start)
;
/*
* Now count loops till the next tick.
*/
start = clock();
msec_loops = 0;
while (clock() == start)
msec_loops++;
/*
* Convert from (loops per clock) to (loops per millisecond).
*/
msec_loops *= CLOCKS_PER_SEC;
msec_loops /= 1000;
}
/*
* Delay for a specified number of milliseconds.
*/
static void delay(int msec)
{
long i;
while (msec-- > 0)
{
for (i = 0; i < msec_loops; i++)
(void) clock();
}
}
#endif
/*
* Return the characters actually input by a "special" key.
*/
public constant char * special_key_str(int key)
{
static char tbuf[40];
constant char *s;
#if MSDOS_COMPILER || OS2
static char k_right[] = { '\340', PCK_RIGHT, 0 };
static char k_left[] = { '\340', PCK_LEFT, 0 };
static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
static char k_insert[] = { '\340', PCK_INSERT, 0 };
static char k_delete[] = { '\340', PCK_DELETE, 0 };
static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
static char k_ctl_backspace[] = { '\177', 0 };
static char k_backspace[] = { '\b', 0 };
static char k_home[] = { '\340', PCK_HOME, 0 };
static char k_end[] = { '\340', PCK_END, 0 };
static char k_up[] = { '\340', PCK_UP, 0 };
static char k_down[] = { '\340', PCK_DOWN, 0 };
static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
static char k_f1[] = { '\340', PCK_F1, 0 };
#endif
#if !MSDOS_COMPILER
char *sp = tbuf;
#endif
switch (key)