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static char rcsid[] = "@(#)$Id: curses.c,v 5.8 1992/12/11 01:45:04 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 5.8 $ $State: Exp $
*
* Copyright (c) 1988-1992 USENET Community Trust
* Copyright (c) 1986,1987 Dave Taylor
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: curses.c,v $
* Revision 5.8 1992/12/11 01:45:04 syd
* remove sys/types.h include, it is now included by defs.h
* and this routine includes defs.h or indirectly includes defs.h
* From: Syd
*
* Revision 5.7 1992/11/07 20:45:39 syd
* add no tite flag on options that should not use ti/te
* Hack by Syd
*
* Revision 5.6 1992/10/27 15:46:35 syd
* Suns dont like ioctl on top of termios
* From: syd
*
* Revision 5.5 1992/10/27 01:52:16 syd
* Always include <sys/ioctl.h> in curses.c When calling ioctl()
*
* Remove declaration of getegid() from leavembox.c & lock.c
* They aren't even used there.
* From: tom@osf.org
*
* Revision 5.4 1992/10/24 13:35:39 syd
* changes found by using codecenter on Elm 2.4.3
* From: Graham Hudspith <gwh@inmos.co.uk>
*
* Revision 5.3 1992/10/17 22:58:57 syd
* patch to make elm use (or in my case, not use) termcap/terminfo ti/te.
* From: Graham Hudspith <gwh@inmos.co.uk>
*
* Revision 5.2 1992/10/11 01:02:05 syd
* Add AIX to those who dont define window size in termios.h
* From: Syd via note from Tom Kovar
*
* Revision 5.1 1992/10/03 22:58:40 syd
* Initial checkin as of 2.4 Release at PL0
*
*
******************************************************************************/
/** This library gives programs the ability to easily access the
termcap information and write screen oriented and raw input
programs. The routines can be called as needed, except that
to use the cursor / screen routines there must be a call to
InitScreen() first. The 'Raw' input routine can be used
independently, however.
**/
/** NOTE THE ADDITION OF: the #ifndef ELM stuff around routines that
we don't use. This is for code size and compile time speed...
**/
#include "headers.h"
#ifdef TERMIOS
# include <termios.h>
# ifndef sun
# include <sys/ioctl.h> /* for TIOCGWINSZ */
# endif
#else
# ifdef TERMIO
# include <termio.h>
# else
# include <sgtty.h>
# endif
#endif
#include <ctype.h>
#ifdef PTEM
# include <sys/stream.h>
# include <sys/ptem.h>
#endif
#ifdef BSD
#undef tolower
#endif
#define TTYIN 0
#ifdef SHORTNAMES
# define _clearinverse _clrinv
# define _cleartoeoln _clrtoeoln
# define _cleartoeos _clr2eos
# define _transmit_off xmit_off
# define _transmit_on xmit_on
#endif
#ifdef TERMIOS
struct termios _raw_tty,
_original_tty;
#define ttgetattr(fd,where) tcgetattr((fd),(where))
#define ttsetattr(fd,where) tcsetattr((fd),TCSADRAIN,(where))
#else /*TERMIOS*/
# ifdef TERMIO
struct termio _raw_tty,
_original_tty;
#define ttgetattr(fd,where) ioctl((fd),TCGETA,(where))
#define ttsetattr(fd,where) ioctl((fd),TCSETAW,(where))
# else
struct sgttyb _raw_tty,
_original_tty;
#define ttgetattr(fd,where) ioctl((fd),TIOCGETP,(where))
#define ttsetattr(fd,where) ioctl((fd),TIOCSETP,(where))
# endif /*TERMIO*/
#endif /*TERMIOS*/
static int _inraw = 0; /* are we IN rawmode? */
#define DEFAULT_LINES_ON_TERMINAL 24
#define DEFAULT_COLUMNS_ON_TERMINAL 80
static int _memory_locked = 0; /* are we IN memlock?? */
static int _line = -1, /* initialize to "trash" */
_col = -1;
static int _intransmit; /* are we transmitting keys? */
static
char *_clearscreen, *_moveto, *_up, *_down, *_right, *_left,
*_setbold, *_clearbold, *_setunderline, *_clearunderline,
*_sethalfbright, *_clearhalfbright, *_setinverse, *_clearinverse,
*_cleartoeoln, *_cleartoeos, *_transmit_on, *_transmit_off,
*_set_memlock, *_clear_memlock, *_start_termcap, *_end_termcap;
static int _lines, _columns, _automargin, _eatnewlineglitch;
int tabspacing;
static char _terminal[1024]; /* Storage for terminal entry */
static char _capabilities[1024]; /* String for cursor motion */
static char *ptr = _capabilities; /* for buffering */
int outchar(); /* char output for tputs */
char *tgetstr(), /* Get termcap capability */
*tgoto(); /* and the goto stuff */
InitScreen()
{
/* Set up all this fun stuff: returns zero if all okay, or;
-1 indicating no terminal name associated with this shell,
-2..-n No termcap for this terminal type known
*/
int tgetent(), /* get termcap entry */
err;
char termname[40];
char *termenv, *strcpy();
if ((termenv = getenv("TERM")) == NULL) return(-1);
if (strcpy(termname, termenv) == NULL)
return(-1);
if ((err = tgetent(_terminal, termname)) != 1)
return(err-2);
_line = 0; /* where are we right now?? */
_col = 0; /* assume zero, zero... */
/* load in all those pesky values */
_clearscreen = tgetstr("cl", &ptr);
_moveto = tgetstr("cm", &ptr);
_up = tgetstr("up", &ptr);
_down = tgetstr("do", &ptr);
_right = tgetstr("nd", &ptr);
_left = tgetstr("bc", &ptr);
_setbold = tgetstr("so", &ptr);
_clearbold = tgetstr("se", &ptr);
_setunderline = tgetstr("us", &ptr);
_clearunderline = tgetstr("ue", &ptr);
_setinverse = tgetstr("so", &ptr);
_clearinverse = tgetstr("se", &ptr);
_sethalfbright = tgetstr("hs", &ptr);
_clearhalfbright = tgetstr("he", &ptr);
_cleartoeoln = tgetstr("ce", &ptr);
_cleartoeos = tgetstr("cd", &ptr);
_lines = tgetnum("li");
_columns = tgetnum("co");
tabspacing = ((tabspacing=tgetnum("it"))==-1 ? 8 : tabspacing);
_automargin = tgetflag("am");
_eatnewlineglitch = tgetflag("xn");
_transmit_on = tgetstr("ks", &ptr);
_transmit_off = tgetstr("ke", &ptr);
_set_memlock = tgetstr("ml", &ptr);
_clear_memlock = tgetstr("mu", &ptr);
_start_termcap = tgetstr("ti", &ptr);
_end_termcap = tgetstr("te", &ptr);
if (!_left) {
_left = "\b";
}
return(0);
}
char *return_value_of(termcap_label)
char *termcap_label;
{
/** This will return the string kept by termcap for the
specified capability. Modified to ensure that if
tgetstr returns a pointer to a transient address
that we won't bomb out with a later segmentation
fault (thanks to Dave@Infopro for this one!)
Tweaked to remove padding sequences.
**/
static char escape_sequence[20];
register int i=0,j=0;
char buffer[20];
char *myptr, *tgetstr(); /* Get termcap capability */
if (strlen(termcap_label) < 2)
return(NULL);
if (termcap_label[0] == 's' && termcap_label[1] == 'o')
{
if (_setinverse)
strcpy(escape_sequence, _setinverse);
else
return( (char *) NULL );
}
else if (termcap_label[0] == 's' && termcap_label[1] == 'e')
{
if (_clearinverse)
strcpy(escape_sequence, _clearinverse);
else
return( (char *) NULL );
}
else if ((myptr = tgetstr(termcap_label, &ptr)) == NULL)
return( (char *) NULL );
else
strcpy(escape_sequence, myptr);
if (chloc(escape_sequence, '$') != -1) {
while (escape_sequence[i] != '\0') {
while (escape_sequence[i] != '$' && escape_sequence[i] != '\0')
buffer[j++] = escape_sequence[i++];
if (escape_sequence[i] == '$') {
while (escape_sequence[i] != '>') i++;
i++;
}
}
buffer[j] = '\0';
strcpy(escape_sequence, buffer);
}
return( (char *) escape_sequence);
}
transmit_functions(newstate)
int newstate;
{
/** turn function key transmission to ON | OFF **/
if (newstate != _intransmit) {
_intransmit = ! _intransmit;
if (newstate == ON)
tputs(_transmit_on, 1, outchar);
else
tputs(_transmit_off, 1, outchar);
fflush(stdout); /* clear the output buffer */
}
}
/****** now into the 'meat' of the routines...the cursor stuff ******/
ScreenSize(lines, columns)
int *lines, *columns;
{
/** returns the number of lines and columns on the display. **/
#ifdef TIOCGWINSZ
struct winsize w;
if (ioctl(1,TIOCGWINSZ,&w) != -1) {
if (w.ws_row > 0)
_lines = w.ws_row;
if (w.ws_col > 0)
_columns = w.ws_col;
}
#endif
if (_lines == 0) _lines = DEFAULT_LINES_ON_TERMINAL;
if (_columns == 0) _columns = DEFAULT_COLUMNS_ON_TERMINAL;
*lines = _lines - 1; /* assume index from zero */
*columns = _columns;
}
SetXYLocation(x,y)
int x,y;
{
/* declare where the cursor is on the screen - useful after using
* a function that moves cursor in predictable fasion but doesn't
* set the static x and y variables used in this source file -
* e.g. getpass().
*/
_line = x;
_col = y;
}
GetXYLocation(x,y)
int *x,*y;
{
/* return the current cursor location on the screen */
*x = _line;
*y = _col;
}
ClearScreen()
{
/* clear the screen: returns -1 if not capable */
_line = 0; /* clear leaves us at top... */
_col = 0;
if (!_clearscreen)
return(-1);
tputs(_clearscreen, 1, outchar);
fflush(stdout); /* clear the output buffer */
return(0);
}
static
CursorUp(n)
int n;
{
/** move the cursor up 'n' lines **/
/** Calling function must check that _up is not null before calling **/
_line = (_line-n > 0? _line - n: 0); /* up 'n' lines... */
while (n-- > 0)
tputs(_up, 1, outchar);
fflush(stdout);
return(0);
}
static
CursorDown(n)
int n;
{
/** move the cursor down 'n' lines **/
/** Caller must check that _down is not null before calling **/
_line = (_line+n <= LINES? _line + n: LINES); /* down 'n' lines... */
while (n-- > 0)
tputs(_down, 1, outchar);
fflush(stdout);
return(0);
}
static
CursorLeft(n)
int n;
{
/** move the cursor 'n' characters to the left **/
/** Caller must check that _left is not null before calling **/
_col = (_col - n> 0? _col - n: 0); /* left 'n' chars... */
while (n-- > 0)
tputs(_left, 1, outchar);
fflush(stdout);
return(0);
}
static
CursorRight(n)
int n;
{
/** move the cursor 'n' characters to the right (nondestructive) **/
/** Caller must check that _right is not null before calling **/
_col = (_col+n < COLUMNS? _col + n: COLUMNS); /* right 'n' chars... */
while (n-- > 0)
tputs(_right, 1, outchar);
fflush(stdout);
return(0);
}
static
moveabsolute(col, row)
{
char *stuff, *tgoto();
stuff = tgoto(_moveto, col, row);
tputs(stuff, 1, outchar);
fflush(stdout);
}
MoveCursor(row, col)
int row, col;
{
/** move cursor to the specified row column on the screen.
0,0 is the top left! **/
int scrollafter = 0;
/* we don't want to change "rows" or we'll mangle scrolling... */
if (col < 0)
col = 0;
if (col >= COLUMNS)
col = COLUMNS - 1;
if (row < 0)
row = 0;
if (row > LINES) {
if (col == 0)
scrollafter = row - LINES;
row = LINES;
}
if (!_moveto)
return(-1);
if (row == _line) {
if (col == _col)
return(0); /* already there! */
else if (abs(col - _col) < 5) { /* within 5 spaces... */
if (col > _col && _right)
CursorRight(col - _col);
else if (col < _col && _left)
CursorLeft(_col - col);
else
moveabsolute(col, row);
}
else /* move along to the new x,y loc */
moveabsolute(col, row);
}
else if (_line == row-1 && col == 0) {
if (_col != 0)
putchar('\r');
putchar('\n');
fflush(stdout);
}
else if (col == _col && abs(row - _line) < 5) {
if (row < _line && _up)
CursorUp(_line - row);
else if (row > _line && _down)
CursorDown(row - _line);
else
moveabsolute(col, row);
}
else
moveabsolute(col, row);
_line = row; /* to ensure we're really there... */
_col = col;
if (scrollafter) {
putchar('\r');
while (scrollafter--)
putchar('\n');
}
return(0);
}
CarriageReturn()
{
/** move the cursor to the beginning of the current line **/
Writechar('\r');
}
NewLine()
{
/** move the cursor to the beginning of the next line **/
Writechar('\r');
Writechar('\n');
}
StartBold()
{
/** start boldface/standout mode **/
if (!_setbold)
return(-1);
tputs(_setbold, 1, outchar);
fflush(stdout);
return(0);
}
EndBold()
{
/** compliment of startbold **/
if (!_clearbold)
return(-1);
tputs(_clearbold, 1, outchar);
fflush(stdout);
return(0);
}
#ifndef ELM
StartUnderline()
{
/** start underline mode **/
if (!_setunderline)
return(-1);
tputs(_setunderline, 1, outchar);
fflush(stdout);
return(0);
}
EndUnderline()
{
/** the compliment of start underline mode **/
if (!_clearunderline)
return(-1);
tputs(_clearunderline, 1, outchar);
fflush(stdout);
return(0);
}
StartHalfbright()
{
/** start half intensity mode **/
if (!_sethalfbright)
return(-1);
tputs(_sethalfbright, 1, outchar);
fflush(stdout);
return(0);
}
EndHalfbright()
{
/** compliment of starthalfbright **/
if (!_clearhalfbright)
return(-1);
tputs(_clearhalfbright, 1, outchar);
fflush(stdout);
return(0);
}
StartInverse()
{
/** set inverse video mode **/
if (!_setinverse)
return(-1);
tputs(_setinverse, 1, outchar);
fflush(stdout);
return(0);
}
EndInverse()
{
/** compliment of startinverse **/
if (!_clearinverse)
return(-1);
tputs(_clearinverse, 1, outchar);
fflush(stdout);
return(0);
}
int
HasMemlock()
{
/** returns TRUE iff memory locking is available (a terminal
feature that allows a specified portion of the screen to
be "locked" & not cleared/scrolled... **/
return ( _set_memlock && _clear_memlock );
}
static int _old_LINES;
int
StartMemlock()
{
/** mark the current line as the "last" line of the portion to
be memory locked (always relative to the top line of the
screen) Note that this will alter LINES so that it knows
the top is locked. This means that (plus) the program
will scroll nicely but (minus) End memlock MUST be called
whenever we leave the locked-memory part of the program! **/
if (! _set_memlock)
return(-1);
if (! _memory_locked) {
_old_LINES = LINES;
LINES -= _line; /* we can't use this for scrolling */
tputs(_set_memlock, 1, outchar);
fflush(stdout);
_memory_locked = TRUE;
}
return(0);
}
int
EndMemlock()
{
/** Clear the locked memory condition... **/
if (! _set_memlock)
return(-1);
if (_memory_locked) {
LINES = _old_LINES; /* back to old setting */
tputs(_clear_memlock, 1, outchar);
fflush(stdout);
_memory_locked = FALSE;
}
return(0);
}
#endif /* ndef ELM */
Writechar(ch)
register int ch;
{
/** write a character to the current screen location. **/
static int wrappedlastchar = 0;
int justwrapped, nt;
ch &= 0xFF;
justwrapped = 0;
/* if return, just go to left column. */
if(ch == '\r') {
if (wrappedlastchar)
justwrapped = 1; /* preserve wrap flag */
else {
putchar('\r');
_col = 0;
}
}
/* if newline and terminal just did a newline without our asking,
* do nothing, else output a newline and increment the line count */
else if (ch == '\n') {
if (!wrappedlastchar) {
putchar('\n');
if (_line < LINES)
++_line;
}
}
/* if backspace, move back one space if not already in column 0 */
else if (ch == BACKSPACE) {
if(_col != 0) {
tputs(_left, 1, outchar);
_col--;
} /* else BACKSPACE does nothing */
}
/* if bell, ring the bell but don't advance the column */
else if (ch == '\007') {
putchar(ch);
}
/* if a tab, output it */
else if (ch == '\t') {
putchar(ch);
if((nt=next_tab(_col+1)) > prev_tab(COLUMNS))
_col = COLUMNS-1;
else
_col = nt-1;
}
else {
/* if some kind of non-printable character change to a '?' */
#ifdef ASCII_CTYPE
if(!isascii(ch) || !isprint(ch))
#else
if(!isprint(ch))
#endif
ch = '?';
/* if we only have one column left, simulate automargins if
* the terminal doesn't have them */
if (_col == COLUMNS - 1) {
putchar(ch);
if (!_automargin || _eatnewlineglitch) {
putchar('\r');
putchar('\n');
}
if (_line < LINES)
++_line;
_col = 0;
justwrapped = 1;
}
/* if we are here this means we have no interference from the
* right margin - just output the character and increment the
* column position. */
else {
putchar(ch);
_col++;
}
}
wrappedlastchar = justwrapped;
return(0);
}
/*VARARGS2*/
Write_to_screen(line, argcount, arg1, arg2, arg3)
char *line;
int argcount;
char *arg1, *arg2, *arg3;
{
/** This routine writes to the screen at the current location.
when done, it increments lines & columns accordingly by
looking for "\n" sequences... **/
switch (argcount) {
case 0 :
PutLine0(_line, _col, line);
break;
case 1 :
PutLine1(_line, _col, line, arg1);
break;
case 2 :
PutLine2(_line, _col, line, arg1, arg2);
break;
case 3 :
PutLine3(_line, _col, line, arg1, arg2, arg3);
break;
}
}
PutLine0(x, y, line)
int x,y;
register char *line;
{
/** Write a zero argument line at location x,y **/
MoveCursor(x,y);
while(*line)
Writechar(*line++);
fflush(stdout);
}
/*VARARGS2*/
PutLine1(x,y, line, arg1)
int x,y;
char *line;
char *arg1;
{
/** write line at location x,y - one argument... **/
char buffer[VERY_LONG_STRING];
sprintf(buffer, line, arg1);
PutLine0(x, y, buffer);
fflush(stdout);
}
/*VARARGS2*/
PutLine2(x,y, line, arg1, arg2)
int x,y;
char *line;
char *arg1, *arg2;
{
/** write line at location x,y - one argument... **/
char buffer[VERY_LONG_STRING];
MCsprintf(buffer, line, arg1, arg2);
PutLine0(x, y, buffer);
fflush(stdout);
}
/*VARARGS2*/
PutLine3(x,y, line, arg1, arg2, arg3)
int x,y;
char *line;
char *arg1, *arg2, *arg3;
{
/** write line at location x,y - one argument... **/
char buffer[VERY_LONG_STRING];
MCsprintf(buffer, line, arg1, arg2, arg3);
PutLine0(x, y, buffer);
fflush(stdout);
}
CleartoEOLN()
{
/** clear to end of line **/
if (!_cleartoeoln)
return(-1);
tputs(_cleartoeoln, 1, outchar);
fflush(stdout); /* clear the output buffer */
return(0);
}
CleartoEOS()
{
/** clear to end of screen **/
if (!_cleartoeos)
return(-1);
tputs(_cleartoeos, 1, outchar);
fflush(stdout); /* clear the output buffer */
return(0);
}
RawState()
{
/** returns either 1 or 0, for ON or OFF **/
return( _inraw );
}
Raw(state)
int state;
{
int do_tite = (state & NO_TITE) == 0;
state = state & ~NO_TITE;
/** state is either ON or OFF, as indicated by call **/
if (state == OFF && _inraw) {
if (use_tite && _end_termcap && do_tite) {
tputs(_end_termcap, 1, outchar);
fflush(stdout);
}
(void) ttsetattr(TTYIN,&_original_tty);
_inraw = 0;
}
else if (state == ON && ! _inraw) {
(void) ttgetattr(TTYIN, &_original_tty);
(void) ttgetattr(TTYIN, &_raw_tty); /** again! **/
#if !defined(TERMIO) && !defined(TERMIOS)
_raw_tty.sg_flags &= ~(ECHO); /* echo off */
_raw_tty.sg_flags |= CBREAK; /* raw on */
#else
_raw_tty.c_lflag &= ~(ICANON | ECHO); /* noecho raw mode */
_raw_tty.c_cc[VMIN] = '\01'; /* minimum # of chars to queue */
_raw_tty.c_cc[VTIME] = '\0'; /* minimum time to wait for input */
#endif
(void) ttsetattr(TTYIN, &_raw_tty);
if (use_tite && _start_termcap && do_tite)
tputs(_start_termcap, 1, outchar);
_inraw = 1;
}
}
int
ReadCh()
{
/** read a character with Raw mode set! **/
register int result;
char ch;
result = read(0, &ch, 1);
return((result <= 0 ) ? EOF : ch);
}
outchar(c)
char c;
{
/** output the given character. From tputs... **/
/** Note: this CANNOT be a macro! **/
putc(c, stdout);
}
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