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/*
** term.c
**
** provide terminal functions for se
**
** On System V systems, we have two possibilities. Release 1 did not have
** the terminfo package, so we assume that if it is Release 1, someone will
** have ported the BSD termlib library. If it is Release 2, then the new
** terminfo package is there, and we wil use it.
**
** This file is part of mse, under GPLv3.
*/
#include "config.h"
#include <stdlib.h>
#include <signal.h>
#include <sys/ioctl.h>
#ifdef HAVE_TERMCAP_H
#include <termcap.h>
#endif
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#else
/* fallback to termio */
#ifdef HAVE_TERMIO_H
#include <termio.h>
#endif
#endif
#include "se.h"
#include "extern.h"
#include "main.h"
#include "misc.h"
#include "screen.h"
#include "term.h"
/* outc -- write a character to the terminal */
int outc (int i)
{
char c;
c = (char) i;
twrite (1, &c, 1);
return i;
}
/*
* code for using BSD termlib -- getting capabilities, and writing them out.
*/
/* capabilities from termcap */
static int AM; /* automatic margins, i.e. wraps at column 80 */
static char *VS; /* visual start -- e.g. clear status line */
static char *VE; /* visual end -- e.g. restore status line */
static char *TI; /* terminal init -- whatever needed for screen ops */
static char *TE; /* terminal ops end */
static char *CM; /* cursor motion, used by tgoto() */
static char *CE; /* clear to end of line */
static char *DL; /* hardware delete line */
static char *AL; /* hardware add (insert) line */
static char *CL; /* clear screen */
static char *STANDOUT; /* standout on (SO conflicts w/ASCII character name) */
static char *SE; /* standout end */
extern char PC; /* Pad character, usually '\0' */
static char *pcstr;
static char caps[128]; /* space for decoded capability strings */
static char *addr_caps; /* address of caps for relocation */
#define TERMBUFSIZ 1024+1
static char termbuf[TERMBUFSIZ];
/* getdescrip --- get descriptions out of termcap entry */
void getdescrip (void)
{
int i;
static struct _table {
char *name;
char **ptr_to_cap;
} table[] = {
"vs", & VS,
"ve", & VE,
"ti", & TI,
"te", & TE,
"cm", & CM,
"ce", & CE,
"dl", & DL,
"al", & AL,
"cl", & CL,
"so", & STANDOUT,
"se", & SE,
"pc", & pcstr,
NULL, NULL
};
AM = tgetflag ("am"); /* only boolean se needs */
/* get string values */
for (i = 0; table[i].name != NULL; i++)
{
*(table[i].ptr_to_cap) = tgetstr (table[i].name, & addr_caps);
}
}
/* setcaps -- get the capabilities from termcap file into termbuf */
int setcaps (char *term)
{
switch (tgetent (termbuf, term)) {
case -1:
error (NO, "se: couldn't open termcap file.");
case 0:
error (NO, "se: no termcap entry for terminal.");
case 1:
addr_caps = caps;
getdescrip (); /* get terminal description */
Nrows = tgetnum ("li");
Ncols = tgetnum ("co");
PC = pcstr ? pcstr[0] : EOS;
break;
default:
error (YES, "in setcaps: can't happen.\n");
}
return (OK);
}
/* t_init -- put out terminal initialization string */
void t_init (void)
{
if (VS)
tputs (VS, 1, outc);
if (TI)
tputs (TI, 1, outc); /* terminal initializations */
}
/* t_exit -- put out strings to turn off whatever modes we had turned on */
void t_exit (void)
{
/* terminal exiting strings */
if (TE)
tputs (TE, 1, outc);
if (VE)
tputs (VE, 1, outc);
tflush (); /* force it out */
}
/* winsize --- get the size of the window from the windowing system */
/* also arrange to catch the windowing signal */
/* 4.3 BSD and/or Sun 3.x */
#define WINSIG SIGWINCH
#define WINIOCTL TIOCGWINSZ
#define WINSTRUCT winsize
#define COLS w.ws_col
#define ROWS w.ws_row
static struct WINSTRUCT w;
void winsize (int sig)
{
static int first = 1;
static char savestatus[MAXCOLS];
int row, oldstatus = Nrows - 1;
int cols, rows;
signal (WINSIG, winsize);
if (ioctl (0, WINIOCTL, (char *) & w) != -1)
{
cols = COLS;
rows = ROWS;
if (first)
{
first = 0;
if (cols && rows)
{
Ncols = cols;
Nrows = rows;
}
return; /* don't redraw screen */
}
else if (Ncols == cols && Nrows == rows)
{
/* only position changed */
return;
}
else
{
if (cols && rows)
{
Ncols = cols;
Nrows = rows;
}
}
}
else
return;
move_ (Screen_image[oldstatus], savestatus, MAXCOLS);
clrscreen ();
Toprow = 0;
Botrow = Nrows - 3;
Cmdrow = Botrow + 1;
Sclen = -1;
for (row = 0; row < Nrows; row++)
move_ (Blanks, Screen_image[row], MAXCOLS);
/* clear screen */
First_affected = Topln;
adjust_window (Curln, Curln);
updscreen (); /* reload from buffer */
loadstr (savestatus, Nrows - 1, 0, Ncols);
remark ("window size change");
tflush ();
}
/* terminal handling functions used throughout the editor */
/* send --- send a printable character, predict cursor position */
void send (char chr)
{
if (Currow == Nrows - 1 && Curcol == Ncols - 1)
return; /* anything in corner causes scroll... */
outc (chr);
if (Curcol == Ncols - 1)
{
if (AM) /* terminal wraps when hits last column */
{
Curcol = 0;
Currow++;
}
}
else /* cursor not at extreme right */
Curcol++;
}
/* clrscreen --- clear entire screen */
void clrscreen (void)
{
Curcol = Currow = 0;
/* clearing screen homes cursor to upper left corner */
/* on all terminals */
tputs (CL, 1, outc);
}
/* position_cursor --- position terminal's cursor to (row, col) */
void position_cursor (int row, int col)
{
if (row < Nrows && row >= 0 /* within vertical range? */
&& col < Ncols && col >= 0 /* within horizontal range? */
&& (row != Currow || col != Curcol))/* not already there? */
{
if (row == Currow && abs (Curcol - col) <= 4)
{
/* short motion in current line */
if (Curcol < col)
for (; Curcol != col; Curcol++)
twrite (1, &Screen_image[Currow][Curcol], 1);
else
for (; Curcol != col; Curcol--)
twrite (1, "\b", 1);
}
else
{
#if defined (USG) && defined(S5R2)
tputs (tparm (cursor_address, row, col), 1, outc);
#else
tputs (tgoto (CM, col, row), 1, outc);
#endif
Currow = row;
Curcol = col;
}
}
}
/* setscreen --- initialize screen and associated descriptive variables */
void setscreen ()
{
int row, col;
t_init (); /* put out the 'ti' and 'vs' capabilities */
clrscreen (); /* clear physical screen, set cursor position */
Toprow = 0;
Botrow = Nrows - 3; /* 1 for 0-origin, 1 for status, 1 for cmd */
Cmdrow = Botrow + 1;
Topln = 1;
Sclen = -1; /* make sure we assume nothing on the screen */
for (row = 0; row < Nrows; row++) /* now clear virtual screen */
for (col = 0; col < Ncols; col++)
Screen_image[row][col] = ' ';
for (col = 0; col < Ncols; col++) /* and clear out status line */
Msgalloc[col] = NOMSG;
Insert_mode = NO;
}
/* inslines --- insert 'n' lines on the screen at 'row' */
void inslines (int row, int n)
{
int i;
int delay;
position_cursor (row, 0);
for (i = 0; i < n; i++)
{
tputs (AL, n, outc);
tflush ();
}
for (i = Nrows - 1; i - n >= Currow; i--)
move_ (Screen_image[i - n], Screen_image[i], Ncols);
for (; i >= Currow; i--)
move_ (Blanks, Screen_image[i], Ncols);
}
/* dellines --- delete 'n' lines beginning at 'row' */
void dellines (int row, int n)
{
int i;
int delay;
position_cursor (row, 0);
for (i = 0; i < n; i++)
{
tputs (DL, n, outc);
tflush ();
}
for (i = Currow; i + n < Nrows; i++)
move_ (Screen_image[i + n], Screen_image[i], Ncols);
for (; i < Nrows; i++)
move_ (Blanks, Screen_image[i], Ncols);
}
/* hwinsdel --- return 1 if the terminal has hardware insert/delete */
int hwinsdel (void)
{
if (No_hardware == YES)
return (NO);
return (AL != NULL && DL != NULL);
}
/* clear_to_eol --- clear screen to end-of-line */
void clear_to_eol (int row, int col)
{
int c, flag;
int hardware = NO;
hardware = (CE != NULL);
flag = NO;
for (c = col; c < Ncols; c++)
if (Screen_image[row][c] != ' ')
{
Screen_image[row][c] = ' ';
if (hardware)
flag = YES;
else
{
position_cursor (row, c);
send (' ');
}
}
if (flag == YES)
{
position_cursor (row, col);
tputs (CE, 1, outc);
} /* end if (flag == YES) */
}
/* set_term -- initialize terminal parameters and actual capabilities */
int set_term (char *type)
{
char *ret;
if (type == NULL)
{
error (NO, "se: terminal type not available");
}
if (type[0] == EOS)
{
error (NO, "in set_term: can't happen.");
}
Ncols = Nrows = -1;
if (setcaps (type) == ERR)
{
error (NO, "se: could not find terminal in system database");
}
if (tgoto (CM, 0, 0) == NULL) /* OOPS returned.. */
{
error (NO, "se: terminal does not have cursor motion.");
}
/*
* first, get it from the library. then check the
* windowing system, if there is one.
*/
winsize (WINSIG);
if (Nrows == -1)
error (NO, "se: could not determine number of rows");
if (Ncols == -1)
error (NO, "se: could not determine number of columns");
return OK;
}
/* brighton --- turn on reverse video/standout mode */
void brighton (void)
{
if (STANDOUT)
tputs (STANDOUT, 1, outc);
}
/* brightoff --- turn off reverse video/standout mode */
void brightoff (void)
{
if (SE)
tputs (SE, 1, outc);
}