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BSD 4_3 development
[unix-history] / usr / contrib / X / xterm / util.c
#include <X/mit-copyright.h>
/* Copyright Massachusetts Institute of Technology 1984, 1985 */
/* util.c */
#ifndef lint
static char *rcsid_util_c = "$Header: util.c,v 10.11 86/04/28 15:05:29 jg Exp $";
#endif lint
#include <stdio.h>
#include <X/Xlib.h>
#include <errno.h>
#include <signal.h>
#include "ptyx.h"
extern errno;
extern debug;
#ifdef JUMPSCROLL
/*
* These routines are used for the jump scroll feature
*/
FlushScroll(screen)
register Screen *screen;
{
register int height = screen->bot_marg - screen->top_marg + 1;
register int samount = screen->scroll_amt;
register int ramount = screen->refresh_amt;
register int scrolled = samount * screen->f_height;
register int refreshed = ramount * screen->f_height;
register int top = screen->top_marg * screen->f_height + screen->border;
int rtop;
if(samount > 0) {
rtop = screen->bot_marg - ramount + 1;
} else {
rtop = screen->top_marg;
top -= scrolled;
ramount = -ramount;
refreshed = -refreshed;
}
if (ramount != height) {
if (screen->multiscroll && samount == 1 &&
screen->top_marg == 0 && screen->bot_marg == screen->max_row) {
if (screen->incopy < 0 && screen->scrolls == 0)
CopyWait (screen);
screen->scrolls++;
} else {
if (screen->incopy)
CopyWait (screen);
screen->incopy = -1;
}
XMoveArea (screen->window,
screen->border, top + scrolled, screen->border, top,
screen->width, height * screen->f_height - refreshed);
}
screen->scroll_amt = 0;
screen->refresh_amt = 0;
XTileSet (screen->window, screen->border,
rtop * screen->f_height + screen->border,
screen->width, refreshed, screen->bgndtile);
ScrnRefresh(screen, rtop, 0, ramount, screen->max_col + 1);
}
AddToRefresh(screen)
register Screen *screen;
{
register int amount = screen->refresh_amt;
register int row = screen->cur_row;
if(amount == 0)
return(0);
if(amount > 0) {
register int bottom;
if(row == (bottom = screen->bot_marg) - amount) {
screen->refresh_amt++;
return(1);
}
return(row >= bottom - amount + 1 && row <= bottom);
} else {
register int top;
amount = -amount;
if(row == (top = screen->top_marg) + amount) {
screen->refresh_amt--;
return(1);
}
return(row <= top + amount - 1 && row >= top);
}
}
#endif JUMPSCROLL
/*
* scrolls the screen by amount lines, erases bottom, doesn't alter
* cursor position (i.e. cursor moves down amount relative to text).
* All done within the scrolling region, of course.
* requires: amount > 0
*/
Scroll (screen, amount)
register Screen *screen;
register int amount;
{
register int height = screen->bot_marg - screen->top_marg + 1;
register int covered;
register int border = screen->border;
register int top = screen->top_marg * screen->f_height + border;
if (amount > height)
amount = height;
#ifdef JUMPSCROLL
if(screen->jumpscroll) {
if(screen->scroll_amt > 0) {
if(screen->refresh_amt + amount > height)
FlushScroll(screen);
screen->scroll_amt += amount;
screen->refresh_amt += amount;
} else {
if(screen->scroll_amt < 0)
FlushScroll(screen);
screen->scroll_amt = amount;
screen->refresh_amt = amount;
}
} else {
#endif JUMPSCROLL
if (amount == height) {
ClearScreen(screen);
return;
}
covered = amount * screen->f_height;
if (screen->multiscroll
&& amount==1
&& screen->top_marg==0
&& screen->bot_marg==screen->max_row) {
if (screen->incopy<0 && screen->scrolls==0)
CopyWait(screen);
screen->scrolls++;
} else {
if (screen->incopy)
CopyWait(screen);
screen->incopy = -1;
}
XMoveArea(screen->window, border, top + covered, border, top,
screen->width, height * screen->f_height - covered);
XTileSet(screen->window, border,
(screen->bot_marg - amount + 1) * screen->f_height + border,
screen->width, covered, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
ScrnDeleteLine(screen->buf, screen->bot_marg, screen->top_marg,
amount, screen->max_col + 1);
}
/*
* Reverse scrolls the screen by amount lines, erases top, doesn't alter
* cursor position (i.e. cursor moves up amount relative to text).
* All done within the scrolling region, of course.
* Requires: amount > 0
*/
RevScroll(screen, amount)
register Screen *screen;
register int amount;
{
register int height = screen->bot_marg - screen->top_marg + 1;
register int border = screen->border;
register int top = screen->top_marg * screen->f_height + border;
register int covered;
amount = (amount < height) ? amount : height;
#ifdef JUMPSCROLL
if(screen->jumpscroll) {
if(screen->scroll_amt < 0) {
if(-screen->refresh_amt + amount > height)
FlushScroll(screen);
screen->scroll_amt -= amount;
screen->refresh_amt -= amount;
} else {
if(screen->scroll_amt > 0)
FlushScroll(screen);
screen->scroll_amt = -amount;
screen->refresh_amt = -amount;
}
} else {
#endif JUMPSCROLL
covered = amount * screen->f_height;
if (screen->incopy)
CopyWait (screen);
screen->incopy = -1;
XMoveArea (screen->window,
border, top,
border, top + covered,
screen->width, height * screen->f_height - covered);
XTileSet (screen->window,
border, top,
screen->width, covered,
screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
ScrnInsertLine (screen->buf, screen->bot_marg, screen->top_marg,
amount, screen->max_col + 1);
}
/*
* If cursor not in scrolling region, returns. Else,
* inserts n blank lines at the cursor's position. Lines above the
* bottom margin are lost.
*/
InsertLine (screen, n)
register Screen *screen;
register int n;
{
register int height;
register int bottom = screen->bot_marg;
if (screen->cur_row < screen->top_marg ||
screen->cur_row > screen->bot_marg) return;
if (screen->cur_row + n - 1 > bottom) n = bottom - screen->cur_row + 1;
#ifdef JUMPSCROLL
if(screen->jumpscroll) {
if(screen->scroll_amt <= 0&&screen->cur_row <= -screen->refresh_amt) {
if(-screen->refresh_amt + n > height)
FlushScroll(screen);
screen->scroll_amt -= n;
screen->refresh_amt -= n;
} else if(screen->scroll_amt)
FlushScroll(screen);
}
if(!screen->scroll_amt) {
#endif JUMPSCROLL
height = n * screen->f_height;
screen->do_wrap = 0;
if (screen->incopy)
CopyWait (screen);
screen->incopy = -1;
/*
* move stuff down.
* clear hole.
*/
XMoveArea(screen->window,
screen->border, CursorY (screen),
screen->border, CursorY (screen) + height,
screen->width,
(bottom + 1 - screen->cur_row - n) * screen->f_height);
XTileSet(screen->window,
screen->border, CursorY (screen),
screen->width, height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
/* adjust screen->buf */
ScrnInsertLine(screen->buf, bottom, screen->cur_row, n,
screen->max_col + 1);
}
/*
* If cursor not in scrolling region, returns. Else, deletes n lines
* at the cursor's position, lines added at bottom margin are blank.
*/
DeleteLine(screen, n)
register Screen *screen;
register int n;
{
register int height;
register int bottom = screen->bot_marg;
if (screen->cur_row < screen->top_marg
|| screen->cur_row > screen->bot_marg)
return;
if (screen->cur_row + n - 1 > bottom)
n = bottom - screen->cur_row + 1;
#ifdef JUMPSCROLL
if(screen->jumpscroll) {
if(screen->scroll_amt >= 0 && screen->cur_row == screen->top_marg) {
if(screen->refresh_amt + n > height)
FlushScroll(screen);
screen->scroll_amt += n;
screen->refresh_amt += n;
} else if(screen->scroll_amt)
FlushScroll(screen);
}
if(!screen->scroll_amt) {
#endif JUMPSCROLL
height = n * screen->f_height;
screen->do_wrap = 0;
if (screen->incopy)
CopyWait(screen);
screen->incopy = -1;
/*
* move stuff up.
* clear bottom.
*/
XMoveArea(screen->window,
screen->border, CursorY (screen) + height,
screen->border, CursorY (screen),
screen->width,
(bottom + 1 - screen->cur_row - n) * screen->f_height);
XTileSet(screen->window,
screen->border,
(bottom + 1 - n) * screen->f_height + screen->border,
screen->width, height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
/* adjust screen->buf */
ScrnDeleteLine(screen->buf, bottom, screen->cur_row, n,
screen->max_col + 1);
}
/*
* Insert n blanks at the cursor's position, no wraparound.
*/
InsertChar (screen, n)
register Screen *screen;
register int n;
{
register int width = n * screen->f_width;
#ifdef JUMPSCROLL
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
screen->do_wrap = 0;
if (screen->incopy)
CopyWait (screen);
screen->incopy = -1;
XMoveArea(screen->window,
CursorX (screen), CursorY (screen),
CursorX (screen) + width, CursorY (screen),
screen->width - (screen->cur_col + n) * screen->f_width,
screen->f_height);
XTileSet(screen->window,
CursorX (screen), CursorY (screen),
width, screen->f_height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
/* adjust screen->buf */
ScrnInsertChar(screen->buf, screen->cur_row, screen->cur_col, n,
screen->max_col + 1);
}
/*
* Deletes n chars at the cursor's position, no wraparound.
*/
DeleteChar (screen, n)
register Screen *screen;
register int n;
{
register int width;
if (screen->cur_col + n > screen->max_col + 1)
n = screen->max_col + 1 - screen->cur_col;
#ifdef JUMPSCROLL
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
width = n * screen->f_width;
screen->do_wrap = 0;
if (screen->incopy)
CopyWait (screen);
screen->incopy = -1;
XMoveArea(screen->window,
CursorX (screen) + width, CursorY (screen),
CursorX (screen), CursorY (screen),
screen->width - (screen->cur_col + n) * screen->f_width,
screen->f_height);
XTileSet (screen->window,
screen->border + screen->width - width, CursorY (screen),
width, screen->f_height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
/* adjust screen->buf */
ScrnDeleteChar (screen->buf, screen->cur_row, screen->cur_col, n,
screen->max_col + 1);
}
/*
* Clear from cursor position to beginning of display, inclusive.
*/
ClearAbove (screen)
register Screen *screen;
{
#ifdef JUMPSCROLL
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
ClearLeft(screen);
XTileSet(screen->window, screen->border, 0,
screen->width, CursorY (screen), screen->bgndtile);
ClearBufRows(screen, 0, screen->cur_row - 1);
}
/*
* Clear from cursor position to end of display, inclusive.
*/
ClearBelow (screen)
register Screen *screen;
{
register int sy = CursorY (screen) + screen->f_height;
#ifdef JUMPSCROLL
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
ClearRight(screen);
XTileSet(screen->window, screen->border, sy,
screen->width, screen->height - sy + screen->border,
screen->bgndtile);
ClearBufRows(screen, screen->cur_row + 1, screen->max_row);
}
/*
* Clear last part of cursor's line, inclusive.
*/
ClearRight (screen)
register Screen *screen;
{
screen->do_wrap = 0;
#ifdef JUMPSCROLL
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
XTileSet(screen->window,
CursorX (screen), CursorY (screen),
screen->width-screen->cur_col * screen->f_width,screen->f_height,
screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
bzero((char *)(screen->buf [screen->cur_row] + screen->cur_col),
sizeof (short) * (screen->max_col - screen->cur_col + 1));
}
/*
* Clear first part of cursor's line, inclusive.
*/
ClearLeft (screen)
register Screen *screen;
{
screen->do_wrap = 0;
#ifdef JUMPSCROLL
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
XTileSet (screen->window,
screen->border, CursorY (screen),
(screen->cur_col + 1) * screen->f_width,
screen->f_height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
bzero ((char *)screen->buf [screen->cur_row],
sizeof (short) * (screen->cur_col + 1));
}
/*
* Erase the cursor's line.
*/
ClearLine(screen)
register Screen *screen;
{
screen->do_wrap = 0;
#ifdef JUMPSCROLL
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
XTileSet (screen->window,
screen->border, CursorY (screen),
screen->width, screen->f_height, screen->bgndtile);
#ifdef JUMPSCROLL
}
#endif JUMPSCROLL
bzero ((char *)screen->buf [screen->cur_row],
sizeof (short) * (screen->max_col + 1));
}
ClearScreen(screen)
register Screen *screen;
{
screen->do_wrap = 0;
#ifdef JUMPSCROLL
if(screen->scroll_amt)
FlushScroll(screen);
#endif JUMPSCROLL
XClear(screen->window);
ClearBufRows (screen, 0, screen->max_row);
}
CopyWait(screen)
register Screen *screen;
{
XEvent reply;
XEvent *rep = &reply;
while (1) {
XWindowEvent (screen->window, ExposeRegion|ExposeCopy, &reply);
switch (reply.type) {
case ExposeRegion:
if (((XExposeEvent *)rep)->detail == ExposeCopy &&
screen->incopy <= 0) {
screen->incopy = 1;
if (screen->scrolls > 0)
screen->scrolls--;
}
HandleExposure (screen, &reply);
break;
case ExposeCopy:
if (screen->incopy <= 0 && screen->scrolls > 0)
screen->scrolls--;
if (screen->scrolls == 0) {
screen->incopy = 0;
return;
}
screen->incopy = -1;
break;
}
}
}
/*
* This routine handles exposure events
*/
HandleExposure (screen, reply)
register Screen *screen;
register XExposeEvent *reply;
{
int toprow, leftcol, nrows, ncols;
extern Terminal term; /* kludge */
XExposeRegionEvent event;
toprow = (reply->y - screen->border) / screen->f_height;
leftcol = (reply->x - screen->border) / screen->f_width;
nrows = (reply->y + reply->height - 1 - screen->border) /
screen->f_height - toprow + 1;
ncols = (reply->x + reply->width - 1 - screen->border) /
screen->f_width - leftcol + 1;
toprow -= screen->scrolls;
if (toprow < 0) {
nrows += toprow;
toprow = 0;
}
if (toprow + nrows - 1 > screen->max_row)
nrows = screen->max_row - toprow + 1;
if (leftcol + ncols - 1 > screen->max_col)
ncols = screen->max_col - leftcol + 1;
if (nrows > 0 && ncols > 0) {
if (screen->TekEmu && reply->detail != ExposeCopy)
/* Clear to avoid possible dangling cursor */
XTileSet (screen->window,
leftcol * screen->f_width + screen->border,
toprow * screen->f_height + screen->border,
ncols * screen->f_width,
nrows * screen->f_height,
screen->bgndtile);
ScrnRefresh (screen, toprow, leftcol, nrows, ncols);
/* only do the tek refresh on the last refresh event */
if (screen->TekEmu) {
XSync(0); /* make sure they are all here */
if (XPending() != 0) {
XPeekEvent(&event);
if (event.type != ExposeRegion) {
if (reply->detail != ExposeCopy)
TekRefresh(&term);
}
}
else {
if (reply->detail != ExposeCopy)
TekRefresh (&term);
}
}
if (screen->cur_row >= toprow &&
screen->cur_row < toprow + nrows &&
screen->cur_col >= leftcol &&
screen->cur_col < leftcol + ncols)
return (1);
}
return (0);
}
Panic(s, a)
char *s;
{
fprintf(stderr, "PANIC! ");
fprintf(stderr, s, a);
fprintf(stderr, "\r\n");
fflush(stderr);
}
Error ()
{
fprintf (stderr, "Error %d: ", errno);
perror ("");
Cleanup(66);
}
/*
* cleanup by sending SIGHUP to client processes
*/
Cleanup (code)
int code;
{
extern Terminal term;
register Screen *screen;
register long pgrp;
screen = &term.screen;
if (screen->pid > 1) {
pgrp = getpgrp(screen->pid);
if (pgrp > 1) killpg(pgrp, SIGHUP);
}
exit(code);
}
/*
* sets the value of var to be arg in the Unix 4.2 BSD environment env.
* Var should end with '=' (bindings are of the form "var=value").
* This procedure assumes the memory for the first level of environ
* was allocated using malloc.
*/
Setenv (var, value)
register char *var, *value;
{
extern char **environ;
register int index = 0;
while (environ [index] != NULL) {
if (strncmp (environ [index], var, strlen (var)) == 0) {
/* found it */
environ [index] = (char *) malloc (strlen (var) + strlen (value));
strcpy (environ [index], var);
strcat (environ [index], value);
return;
}
index ++;
}
if (debug) printf ("expanding env\n");
environ = (char **) realloc((char *)environ, sizeof(char *) * (index+2));
if (environ == NULL) {
fprintf (stderr, "Setenv: malloc out of memory\n");
exit (1);
}
environ [index] = (char *) malloc (strlen (var) + strlen (value));
strcpy (environ [index], var);
strcat (environ [index], value);
environ [++index] = NULL;
}
/*
* returns a pointer to the first occurrence of s2 in s1,
* or NULL if there are none.
*/
char *strindex (s1, s2)
register char *s1, *s2;
{
register char *s3;
char *index();
while ((s3=index(s1, *s2)) != NULL) {
if (strncmp(s3, s2, strlen(s2)) == 0)
return (s3);
s1 = ++s3;
}
return (NULL);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.