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| Current File : //usr/src/contrib/nvi/cl/cl_funcs.c |
/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)cl_funcs.c 10.50 (Berkeley) 9/24/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <curses.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "../common/common.h"
#include "../vi/vi.h"
#include "cl.h"
/*
* cl_addstr --
* Add len bytes from the string at the cursor, advancing the cursor.
*
* PUBLIC: int cl_addstr __P((SCR *, const char *, size_t));
*/
int
cl_addstr(sp, str, len)
SCR *sp;
const char *str;
size_t len;
{
CL_PRIVATE *clp;
size_t oldy, oldx;
int iv;
clp = CLP(sp);
/*
* If ex isn't in control, it's the last line of the screen and
* it's a split screen, use inverse video.
*/
iv = 0;
getyx(stdscr, oldy, oldx);
if (!F_ISSET(sp, SC_SCR_EXWROTE) &&
oldy == RLNO(sp, LASTLINE(sp)) && IS_SPLIT(sp)) {
iv = 1;
(void)standout();
}
if (addnstr(str, len) == ERR)
return (1);
if (iv)
(void)standend();
return (0);
}
/*
* cl_attr --
* Toggle a screen attribute on/off.
*
* PUBLIC: int cl_attr __P((SCR *, scr_attr_t, int));
*/
int
cl_attr(sp, attribute, on)
SCR *sp;
scr_attr_t attribute;
int on;
{
CL_PRIVATE *clp;
clp = CLP(sp);
switch (attribute) {
case SA_ALTERNATE:
/*
* !!!
* There's a major layering violation here. The problem is that the
* X11 xterm screen has what's known as an "alternate" screen. Some
* xterm termcap/terminfo entries include sequences to switch to/from
* that alternate screen as part of the ti/te (smcup/rmcup) strings.
* Vi runs in the alternate screen, so that you are returned to the
* same screen contents on exit from vi that you had when you entered
* vi. Further, when you run :shell, or :!date or similar ex commands,
* you also see the original screen contents. This wasn't deliberate
* on vi's part, it's just that it historically sent terminal init/end
* sequences at those times, and the addition of the alternate screen
* sequences to the strings changed the behavior of vi. The problem
* caused by this is that we don't want to switch back to the alternate
* screen while getting a new command from the user, when the user is
* continuing to enter ex commands, e.g.:
*
* :!date <<< switch to original screen
* [Hit return to continue] <<< prompt user to continue
* :command <<< get command from user
*
* Note that the :command input is a true vi input mode, e.g., input
* maps and abbreviations are being done. So, we need to be able to
* switch back into the vi screen mode, without flashing the screen.
*
* To make matters worse, the curses initscr() and endwin() calls will
* do this automatically -- so, this attribute isn't as controlled by
* the higher level screen as closely as one might like.
*/
if (on) {
if (clp->ti_te != TI_SENT) {
clp->ti_te = TI_SENT;
if (clp->smcup == NULL)
(void)cl_getcap(sp, "smcup", &clp->smcup);
if (clp->smcup != NULL)
(void)tputs(clp->smcup, 1, cl_putchar);
}
} else
if (clp->ti_te != TE_SENT) {
clp->ti_te = TE_SENT;
if (clp->rmcup == NULL)
(void)cl_getcap(sp, "rmcup", &clp->rmcup);
if (clp->rmcup != NULL)
(void)tputs(clp->rmcup, 1, cl_putchar);
(void)fflush(stdout);
}
(void)fflush(stdout);
break;
case SA_INVERSE:
if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)) {
if (clp->smso == NULL)
return (1);
if (on)
(void)tputs(clp->smso, 1, cl_putchar);
else
(void)tputs(clp->rmso, 1, cl_putchar);
(void)fflush(stdout);
} else {
if (on)
(void)standout();
else
(void)standend();
}
break;
default:
abort();
}
return (0);
}
/*
* cl_baud --
* Return the baud rate.
*
* PUBLIC: int cl_baud __P((SCR *, u_long *));
*/
int
cl_baud(sp, ratep)
SCR *sp;
u_long *ratep;
{
CL_PRIVATE *clp;
/*
* XXX
* There's no portable way to get a "baud rate" -- cfgetospeed(3)
* returns the value associated with some #define, which we may
* never have heard of, or which may be a purely local speed. Vi
* only cares if it's SLOW (w300), slow (w1200) or fast (w9600).
* Try and detect the slow ones, and default to fast.
*/
clp = CLP(sp);
switch (cfgetospeed(&clp->orig)) {
case B50:
case B75:
case B110:
case B134:
case B150:
case B200:
case B300:
case B600:
*ratep = 600;
break;
case B1200:
*ratep = 1200;
break;
default:
*ratep = 9600;
break;
}
return (0);
}
/*
* cl_bell --
* Ring the bell/flash the screen.
*
* PUBLIC: int cl_bell __P((SCR *));
*/
int
cl_bell(sp)
SCR *sp;
{
if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE))
(void)write(STDOUT_FILENO, "\07", 1); /* \a */
else {
/*
* Vi has an edit option which determines if the terminal
* should be beeped or the screen flashed.
*/
if (O_ISSET(sp, O_FLASH))
(void)flash();
else
(void)beep();
}
return (0);
}
/*
* cl_clrtoeol --
* Clear from the current cursor to the end of the line.
*
* PUBLIC: int cl_clrtoeol __P((SCR *));
*/
int
cl_clrtoeol(sp)
SCR *sp;
{
return (clrtoeol() == ERR);
}
/*
* cl_cursor --
* Return the current cursor position.
*
* PUBLIC: int cl_cursor __P((SCR *, size_t *, size_t *));
*/
int
cl_cursor(sp, yp, xp)
SCR *sp;
size_t *yp, *xp;
{
/*
* The curses screen support splits a single underlying curses screen
* into multiple screens to support split screen semantics. For this
* reason the returned value must be adjusted to be relative to the
* current screen, and not absolute. Screens that implement the split
* using physically distinct screens won't need this hack.
*/
getyx(stdscr, *yp, *xp);
*yp -= sp->woff;
return (0);
}
/*
* cl_deleteln --
* Delete the current line, scrolling all lines below it.
*
* PUBLIC: int cl_deleteln __P((SCR *));
*/
int
cl_deleteln(sp)
SCR *sp;
{
CHAR_T ch;
CL_PRIVATE *clp;
size_t col, lno, spcnt, oldy, oldx;
clp = CLP(sp);
/*
* This clause is required because the curses screen uses reverse
* video to delimit split screens. If the screen does not do this,
* this code won't be necessary.
*
* If the bottom line was in reverse video, rewrite it in normal
* video before it's scrolled.
*
* Check for the existence of a chgat function; XSI requires it, but
* historic implementations of System V curses don't. If it's not
* a #define, we'll fall back to doing it by hand, which is slow but
* acceptable.
*
* By hand means walking through the line, retrieving and rewriting
* each character. Curses has no EOL marker, so track strings of
* spaces, and copy the trailing spaces only if there's a non-space
* character following.
*/
if (!F_ISSET(sp, SC_SCR_EXWROTE) && IS_SPLIT(sp)) {
getyx(stdscr, oldy, oldx);
#ifdef mvchgat
mvchgat(RLNO(sp, LASTLINE(sp)), 0, -1, A_NORMAL, 0, NULL);
#else
for (lno = RLNO(sp, LASTLINE(sp)), col = spcnt = 0;;) {
(void)move(lno, col);
ch = winch(stdscr);
if (isblank(ch))
++spcnt;
else {
(void)move(lno, col - spcnt);
for (; spcnt > 0; --spcnt)
(void)addch(' ');
(void)addch(ch);
}
if (++col >= sp->cols)
break;
}
#endif
(void)move(oldy, oldx);
}
/*
* The bottom line is expected to be blank after this operation,
* and other screens must support that semantic.
*/
return (deleteln() == ERR);
}
/*
* cl_ex_adjust --
* Adjust the screen for ex. This routine is purely for standalone
* ex programs. All special purpose, all special case.
*
* PUBLIC: int cl_ex_adjust __P((SCR *, exadj_t));
*/
int
cl_ex_adjust(sp, action)
SCR *sp;
exadj_t action;
{
CL_PRIVATE *clp;
int cnt;
clp = CLP(sp);
switch (action) {
case EX_TERM_SCROLL:
/* Move the cursor up one line if that's possible. */
if (clp->cuu1 != NULL)
(void)tputs(clp->cuu1, 1, cl_putchar);
else if (clp->cup != NULL)
(void)tputs(tgoto(clp->cup,
0, LINES - 2), 1, cl_putchar);
else
return (0);
/* FALLTHROUGH */
case EX_TERM_CE:
/* Clear the line. */
if (clp->el != NULL) {
(void)putchar('\r');
(void)tputs(clp->el, 1, cl_putchar);
} else {
/*
* Historically, ex didn't erase the line, so, if the
* displayed line was only a single glyph, and <eof>
* was more than one glyph, the output would not fully
* overwrite the user's input. To fix this, output
* the maxiumum character number of spaces. Note,
* this won't help if the user entered extra prompt
* or <blank> characters before the command character.
* We'd have to do a lot of work to make that work, and
* it's almost certainly not worth the effort.
*/
for (cnt = 0; cnt < MAX_CHARACTER_COLUMNS; ++cnt)
(void)putchar('\b');
for (cnt = 0; cnt < MAX_CHARACTER_COLUMNS; ++cnt)
(void)putchar(' ');
(void)putchar('\r');
(void)fflush(stdout);
}
break;
default:
abort();
}
return (0);
}
/*
* cl_insertln --
* Push down the current line, discarding the bottom line.
*
* PUBLIC: int cl_insertln __P((SCR *));
*/
int
cl_insertln(sp)
SCR *sp;
{
/*
* The current line is expected to be blank after this operation,
* and the screen must support that semantic.
*/
return (insertln() == ERR);
}
/*
* cl_keyval --
* Return the value for a special key.
*
* PUBLIC: int cl_keyval __P((SCR *, scr_keyval_t, CHAR_T *, int *));
*/
int
cl_keyval(sp, val, chp, dnep)
SCR *sp;
scr_keyval_t val;
CHAR_T *chp;
int *dnep;
{
CL_PRIVATE *clp;
/*
* VEOF, VERASE and VKILL are required by POSIX 1003.1-1990,
* VWERASE is a 4BSD extension.
*/
clp = CLP(sp);
switch (val) {
case KEY_VEOF:
*dnep = (*chp = clp->orig.c_cc[VEOF]) == _POSIX_VDISABLE;
break;
case KEY_VERASE:
*dnep = (*chp = clp->orig.c_cc[VERASE]) == _POSIX_VDISABLE;
break;
case KEY_VKILL:
*dnep = (*chp = clp->orig.c_cc[VKILL]) == _POSIX_VDISABLE;
break;
#ifdef VWERASE
case KEY_VWERASE:
*dnep = (*chp = clp->orig.c_cc[VWERASE]) == _POSIX_VDISABLE;
break;
#endif
default:
*dnep = 1;
break;
}
return (0);
}
/*
* cl_move --
* Move the cursor.
*
* PUBLIC: int cl_move __P((SCR *, size_t, size_t));
*/
int
cl_move(sp, lno, cno)
SCR *sp;
size_t lno, cno;
{
/* See the comment in cl_cursor. */
if (move(RLNO(sp, lno), cno) == ERR) {
msgq(sp, M_ERR,
"Error: move: l(%u) c(%u) o(%u)", lno, cno, sp->woff);
return (1);
}
return (0);
}
/*
* cl_refresh --
* Refresh the screen.
*
* PUBLIC: int cl_refresh __P((SCR *, int));
*/
int
cl_refresh(sp, repaint)
SCR *sp;
int repaint;
{
CL_PRIVATE *clp;
clp = CLP(sp);
/*
* If we received a killer signal, we're done, there's no point
* in refreshing the screen.
*/
if (clp->killersig)
return (0);
/*
* If repaint is set, the editor is telling us that we don't know
* what's on the screen, so we have to repaint from scratch.
*
* In the curses library, doing wrefresh(curscr) is okay, but the
* screen flashes when we then apply the refresh() to bring it up
* to date. So, use clearok().
*/
if (repaint)
clearok(curscr, 1);
return (refresh() == ERR);
}
/*
* cl_rename --
* Rename the file.
*
* PUBLIC: int cl_rename __P((SCR *, char *, int));
*/
int
cl_rename(sp, name, on)
SCR *sp;
char *name;
int on;
{
GS *gp;
CL_PRIVATE *clp;
char *ttype;
gp = sp->gp;
clp = CLP(sp);
ttype = OG_STR(gp, GO_TERM);
/*
* XXX
* We can only rename windows for xterm.
*/
if (on) {
if (F_ISSET(clp, CL_RENAME_OK) &&
!strncmp(ttype, "xterm", sizeof("xterm") - 1)) {
F_SET(clp, CL_RENAME);
(void)printf(XTERM_RENAME, name);
(void)fflush(stdout);
}
} else
if (F_ISSET(clp, CL_RENAME)) {
F_CLR(clp, CL_RENAME);
(void)printf(XTERM_RENAME, ttype);
(void)fflush(stdout);
}
return (0);
}
/*
* cl_suspend --
* Suspend a screen.
*
* PUBLIC: int cl_suspend __P((SCR *, int *));
*/
int
cl_suspend(sp, allowedp)
SCR *sp;
int *allowedp;
{
struct termios t;
CL_PRIVATE *clp;
GS *gp;
size_t oldy, oldx;
int changed;
gp = sp->gp;
clp = CLP(sp);
*allowedp = 1;
/*
* The ex implementation of this function isn't needed by screens not
* supporting ex commands that require full terminal canonical mode
* (e.g. :suspend).
*
* The vi implementation of this function isn't needed by screens not
* supporting vi process suspension, i.e. any screen that isn't backed
* by a UNIX shell.
*
* Setting allowedp to 0 will cause the editor to reject the command.
*/
if (F_ISSET(sp, SC_EX)) {
/* Save the terminal settings, and restore the original ones. */
if (F_ISSET(clp, CL_STDIN_TTY)) {
(void)tcgetattr(STDIN_FILENO, &t);
(void)tcsetattr(STDIN_FILENO,
TCSASOFT | TCSADRAIN, &clp->orig);
}
/* Stop the process group. */
(void)kill(0, SIGTSTP);
/* Time passes ... */
/* Restore terminal settings. */
if (F_ISSET(clp, CL_STDIN_TTY))
(void)tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &t);
return (0);
}
/*
* Move to the lower left-hand corner of the screen.
*
* XXX
* Not sure this is necessary in System V implementations, but it
* shouldn't hurt.
*/
getyx(stdscr, oldy, oldx);
(void)move(LINES - 1, 0);
(void)refresh();
/*
* Temporarily end the screen. System V introduced a semantic where
* endwin() could be restarted. We use it because restarting curses
* from scratch often fails in System V. 4BSD curses didn't support
* restarting after endwin(), so we have to do what clean up we can
* without calling it.
*/
#ifdef HAVE_BSD_CURSES
/* Save the terminal settings. */
(void)tcgetattr(STDIN_FILENO, &t);
#endif
/* Restore the cursor keys to normal mode. */
(void)keypad(stdscr, FALSE);
/* Restore the window name. */
(void)cl_rename(sp, NULL, 0);
#ifdef HAVE_BSD_CURSES
(void)cl_attr(sp, SA_ALTERNATE, 0);
#else
(void)endwin();
#endif
/*
* XXX
* Restore the original terminal settings. This is bad -- the
* reset can cause character loss from the tty queue. However,
* we can't call endwin() in BSD curses implementations, and too
* many System V curses implementations don't get it right.
*/
(void)tcsetattr(STDIN_FILENO, TCSADRAIN | TCSASOFT, &clp->orig);
/* Stop the process group. */
(void)kill(0, SIGTSTP);
/* Time passes ... */
/*
* If we received a killer signal, we're done. Leave everything
* unchanged. In addition, the terminal has already been reset
* correctly, so leave it alone.
*/
if (clp->killersig) {
F_CLR(clp, CL_SCR_EX_INIT | CL_SCR_VI_INIT);
return (0);
}
#ifdef HAVE_BSD_CURSES
/* Restore terminal settings. */
if (F_ISSET(clp, CL_STDIN_TTY))
(void)tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &t);
(void)cl_attr(sp, SA_ALTERNATE, 1);
#endif
/* Set the window name. */
(void)cl_rename(sp, sp->frp->name, 1);
/* Put the cursor keys into application mode. */
(void)keypad(stdscr, TRUE);
/* Refresh and repaint the screen. */
(void)move(oldy, oldx);
(void)cl_refresh(sp, 1);
/* If the screen changed size, set the SIGWINCH bit. */
if (cl_ssize(sp, 1, NULL, NULL, &changed))
return (1);
if (changed)
F_SET(CLP(sp), CL_SIGWINCH);
return (0);
}
/*
* cl_usage --
* Print out the curses usage messages.
*
* PUBLIC: void cl_usage __P((void));
*/
void
cl_usage()
{
#define USAGE "\
usage: ex [-eFRrSsv] [-c command] [-t tag] [-w size] [file ...]\n\
usage: vi [-eFlRrSv] [-c command] [-t tag] [-w size] [file ...]\n"
(void)fprintf(stderr, "%s", USAGE);
#undef USAGE
}
#ifdef DEBUG
/*
* gdbrefresh --
* Stub routine so can flush out curses screen changes using gdb.
*/
int
gdbrefresh()
{
refresh();
return (0); /* XXX Convince gdb to run it. */
}
#endif