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Annotation of 43BSD/contrib/X/xterm/util.c, revision 1.1

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* Copyright    Massachusetts Institute of Technology    1984, 1985    */
        !             4: 
        !             5: /* util.c */
        !             6: 
        !             7: #ifndef lint
        !             8: static char *rcsid_util_c = "$Header: util.c,v 10.11 86/04/28 15:05:29 jg Exp $";
        !             9: #endif lint
        !            10: 
        !            11: #include <stdio.h>
        !            12: #include <X/Xlib.h>
        !            13: #include <errno.h>
        !            14: #include <signal.h>
        !            15: 
        !            16: #include "ptyx.h"
        !            17: 
        !            18: extern errno;
        !            19: extern debug;
        !            20: #ifdef JUMPSCROLL
        !            21: /*
        !            22:  * These routines are used for the jump scroll feature
        !            23:  */
        !            24: FlushScroll(screen)
        !            25: register Screen *screen;
        !            26: {
        !            27:        register int height = screen->bot_marg - screen->top_marg + 1;
        !            28:        register int samount = screen->scroll_amt;
        !            29:        register int ramount = screen->refresh_amt;
        !            30:        register int scrolled = samount * screen->f_height;
        !            31:        register int refreshed = ramount * screen->f_height;
        !            32:        register int top = screen->top_marg * screen->f_height + screen->border;
        !            33:        int rtop;
        !            34: 
        !            35:   if(samount > 0) {
        !            36:     rtop = screen->bot_marg - ramount + 1;
        !            37:   } else {
        !            38:     rtop = screen->top_marg;
        !            39:     top -= scrolled;
        !            40:     ramount = -ramount;
        !            41:     refreshed = -refreshed;
        !            42:   }
        !            43: 
        !            44:   if (ramount != height) {
        !            45: 
        !            46:       if (screen->multiscroll && samount == 1 &&
        !            47:          screen->top_marg == 0 && screen->bot_marg == screen->max_row) {
        !            48:              if (screen->incopy < 0 && screen->scrolls == 0)
        !            49:                      CopyWait (screen);
        !            50:              screen->scrolls++;
        !            51:       } else {
        !            52:              if (screen->incopy)
        !            53:                      CopyWait (screen);
        !            54:              screen->incopy = -1;
        !            55:       }
        !            56: 
        !            57:       XMoveArea (screen->window,
        !            58:                 screen->border, top + scrolled, screen->border, top,
        !            59:                 screen->width, height * screen->f_height - refreshed);
        !            60:   }
        !            61:   screen->scroll_amt = 0;
        !            62:   screen->refresh_amt = 0;
        !            63:   XTileSet (screen->window, screen->border,
        !            64:            rtop * screen->f_height + screen->border,
        !            65:            screen->width, refreshed, screen->bgndtile);
        !            66:   ScrnRefresh(screen, rtop, 0, ramount, screen->max_col + 1);
        !            67: }
        !            68: 
        !            69: AddToRefresh(screen)
        !            70: register Screen *screen;
        !            71: {
        !            72:        register int amount = screen->refresh_amt;
        !            73:        register int row = screen->cur_row;
        !            74: 
        !            75:        if(amount == 0)
        !            76:                return(0);
        !            77:        if(amount > 0) {
        !            78:                register int bottom;
        !            79: 
        !            80:                if(row == (bottom = screen->bot_marg) - amount) {
        !            81:                        screen->refresh_amt++;
        !            82:                        return(1);
        !            83:                }
        !            84:                return(row >= bottom - amount + 1 && row <= bottom);
        !            85:        } else {
        !            86:                register int top;
        !            87: 
        !            88:                amount = -amount;
        !            89:                if(row == (top = screen->top_marg) + amount) {
        !            90:                        screen->refresh_amt--;
        !            91:                        return(1);
        !            92:                }
        !            93:                return(row <= top + amount - 1 && row >= top);
        !            94:        }
        !            95: }
        !            96: #endif JUMPSCROLL
        !            97: 
        !            98: /* 
        !            99:  * scrolls the screen by amount lines, erases bottom, doesn't alter 
        !           100:  * cursor position (i.e. cursor moves down amount relative to text).
        !           101:  * All done within the scrolling region, of course. 
        !           102:  * requires: amount > 0
        !           103:  */
        !           104: Scroll (screen, amount)
        !           105: register Screen *screen;
        !           106: register int amount;
        !           107: {
        !           108:        register int height = screen->bot_marg - screen->top_marg + 1;
        !           109:        register int covered;
        !           110:        register int border = screen->border;
        !           111:        register int top = screen->top_marg * screen->f_height + border;
        !           112: 
        !           113:        if (amount > height)
        !           114:                amount = height;
        !           115: #ifdef JUMPSCROLL
        !           116:     if(screen->jumpscroll) {
        !           117:        if(screen->scroll_amt > 0) {
        !           118:                if(screen->refresh_amt + amount > height)
        !           119:                        FlushScroll(screen);
        !           120:                screen->scroll_amt += amount;
        !           121:                screen->refresh_amt += amount;
        !           122:        } else {
        !           123:                if(screen->scroll_amt < 0)
        !           124:                        FlushScroll(screen);
        !           125:                screen->scroll_amt = amount;
        !           126:                screen->refresh_amt = amount;
        !           127:        }
        !           128:     } else {
        !           129: #endif JUMPSCROLL
        !           130: 
        !           131:        if (amount == height) {
        !           132:                ClearScreen(screen);
        !           133:                return;
        !           134:        }
        !           135: 
        !           136:        covered = amount * screen->f_height;
        !           137: 
        !           138:        if (screen->multiscroll
        !           139:        && amount==1
        !           140:        && screen->top_marg==0
        !           141:        && screen->bot_marg==screen->max_row) {
        !           142:                if (screen->incopy<0 && screen->scrolls==0)
        !           143:                        CopyWait(screen);
        !           144:                screen->scrolls++;
        !           145:        } else {
        !           146:                if (screen->incopy)
        !           147:                        CopyWait(screen);
        !           148:                screen->incopy = -1;
        !           149:        }
        !           150: 
        !           151:        XMoveArea(screen->window, border, top + covered, border, top,
        !           152:                screen->width, height * screen->f_height - covered);
        !           153:        XTileSet(screen->window, border,
        !           154:                (screen->bot_marg - amount + 1) * screen->f_height + border,
        !           155:                screen->width, covered, screen->bgndtile);
        !           156: #ifdef JUMPSCROLL
        !           157:        }
        !           158: #endif JUMPSCROLL
        !           159: 
        !           160:        ScrnDeleteLine(screen->buf, screen->bot_marg, screen->top_marg,
        !           161:                        amount, screen->max_col + 1);
        !           162: }
        !           163: 
        !           164: 
        !           165: /*
        !           166:  * Reverse scrolls the screen by amount lines, erases top, doesn't alter
        !           167:  * cursor position (i.e. cursor moves up amount relative to text).
        !           168:  * All done within the scrolling region, of course.
        !           169:  * Requires: amount > 0
        !           170:  */
        !           171: RevScroll(screen, amount)
        !           172: register Screen *screen;
        !           173: register int amount;
        !           174: {
        !           175:        register int height = screen->bot_marg - screen->top_marg + 1;
        !           176:        register int border = screen->border;
        !           177:        register int top = screen->top_marg * screen->f_height + border;
        !           178:        register int covered;
        !           179: 
        !           180:        amount = (amount < height) ? amount : height;
        !           181: #ifdef JUMPSCROLL
        !           182:     if(screen->jumpscroll) {
        !           183:        if(screen->scroll_amt < 0) {
        !           184:                if(-screen->refresh_amt + amount > height)
        !           185:                        FlushScroll(screen);
        !           186:                screen->scroll_amt -= amount;
        !           187:                screen->refresh_amt -= amount;
        !           188:        } else {
        !           189:                if(screen->scroll_amt > 0)
        !           190:                        FlushScroll(screen);
        !           191:                screen->scroll_amt = -amount;
        !           192:                screen->refresh_amt = -amount;
        !           193:        }
        !           194:     } else {
        !           195: #endif JUMPSCROLL
        !           196:        covered = amount * screen->f_height;
        !           197: 
        !           198:        if (screen->incopy)
        !           199:                CopyWait (screen);
        !           200:        screen->incopy = -1;
        !           201: 
        !           202:        XMoveArea (screen->window,
        !           203:                border, top,
        !           204:                border, top + covered,
        !           205:                screen->width, height * screen->f_height - covered);
        !           206:        XTileSet (screen->window,
        !           207:                border, top,
        !           208:                screen->width, covered,
        !           209:                screen->bgndtile);
        !           210: 
        !           211: #ifdef JUMPSCROLL
        !           212:        }
        !           213: #endif JUMPSCROLL
        !           214:        ScrnInsertLine (screen->buf, screen->bot_marg, screen->top_marg,
        !           215:                        amount, screen->max_col + 1);
        !           216: }
        !           217: 
        !           218: /*
        !           219:  * If cursor not in scrolling region, returns.  Else,
        !           220:  * inserts n blank lines at the cursor's position.  Lines above the
        !           221:  * bottom margin are lost.
        !           222:  */
        !           223: InsertLine (screen, n)
        !           224: register Screen *screen;
        !           225: register int n;
        !           226: {
        !           227:        register int height;
        !           228:        register int bottom = screen->bot_marg;
        !           229: 
        !           230:        if (screen->cur_row < screen->top_marg ||
        !           231:            screen->cur_row > screen->bot_marg) return;
        !           232:        
        !           233:        if (screen->cur_row + n - 1 > bottom) n = bottom - screen->cur_row + 1;
        !           234: #ifdef JUMPSCROLL
        !           235:     if(screen->jumpscroll) {
        !           236:        if(screen->scroll_amt <= 0&&screen->cur_row <= -screen->refresh_amt) {
        !           237:                if(-screen->refresh_amt + n > height)
        !           238:                        FlushScroll(screen);
        !           239:                screen->scroll_amt -= n;
        !           240:                screen->refresh_amt -= n;
        !           241:        } else if(screen->scroll_amt)
        !           242:                FlushScroll(screen);
        !           243:     }
        !           244:     if(!screen->scroll_amt) {
        !           245: #endif JUMPSCROLL
        !           246: 
        !           247: 
        !           248:        height = n * screen->f_height;
        !           249: 
        !           250:        screen->do_wrap = 0;
        !           251: 
        !           252:        if (screen->incopy)
        !           253:                CopyWait (screen);
        !           254:        screen->incopy = -1;
        !           255: 
        !           256:        /*
        !           257:         * move stuff down.
        !           258:         * clear hole.
        !           259:         */
        !           260:        XMoveArea(screen->window,
        !           261:                     screen->border, CursorY (screen),
        !           262:                     screen->border, CursorY (screen) + height,
        !           263:                     screen->width,
        !           264:                     (bottom + 1 - screen->cur_row - n) * screen->f_height);
        !           265:        XTileSet(screen->window,
        !           266:                screen->border, CursorY (screen),
        !           267:                screen->width, height, screen->bgndtile);
        !           268: 
        !           269: #ifdef JUMPSCROLL
        !           270:        }
        !           271: #endif JUMPSCROLL
        !           272:        /* adjust screen->buf */
        !           273:        ScrnInsertLine(screen->buf, bottom, screen->cur_row, n,
        !           274:                        screen->max_col + 1);
        !           275: }
        !           276: 
        !           277: /*
        !           278:  * If cursor not in scrolling region, returns.  Else, deletes n lines
        !           279:  * at the cursor's position, lines added at bottom margin are blank.
        !           280:  */
        !           281: DeleteLine(screen, n)
        !           282: register Screen *screen;
        !           283: register int n;
        !           284: {
        !           285:        register int height;
        !           286:        register int bottom = screen->bot_marg;
        !           287: 
        !           288:        if (screen->cur_row < screen->top_marg
        !           289:        || screen->cur_row > screen->bot_marg)
        !           290:                return;
        !           291:        
        !           292:        if (screen->cur_row + n - 1 > bottom)
        !           293:                n = bottom - screen->cur_row + 1;
        !           294: #ifdef JUMPSCROLL
        !           295:     if(screen->jumpscroll) {
        !           296:        if(screen->scroll_amt >= 0 && screen->cur_row == screen->top_marg) {
        !           297:                if(screen->refresh_amt + n > height)
        !           298:                        FlushScroll(screen);
        !           299:                screen->scroll_amt += n;
        !           300:                screen->refresh_amt += n;
        !           301:        } else if(screen->scroll_amt)
        !           302:                FlushScroll(screen);
        !           303:     }
        !           304:     if(!screen->scroll_amt) {
        !           305: #endif JUMPSCROLL
        !           306: 
        !           307:        height = n * screen->f_height;
        !           308:        screen->do_wrap = 0;
        !           309: 
        !           310:        if (screen->incopy)
        !           311:                CopyWait(screen);
        !           312:        screen->incopy = -1;
        !           313: 
        !           314:        /*
        !           315:         * move stuff up.
        !           316:         * clear bottom.
        !           317:         */
        !           318:        XMoveArea(screen->window,
        !           319:                     screen->border, CursorY (screen) + height,
        !           320:                     screen->border, CursorY (screen),
        !           321:                     screen->width,
        !           322:                     (bottom + 1 - screen->cur_row - n) * screen->f_height);
        !           323:        XTileSet(screen->window,
        !           324:                     screen->border,
        !           325:                     (bottom + 1 - n) * screen->f_height + screen->border,
        !           326:                     screen->width, height, screen->bgndtile);
        !           327: 
        !           328: #ifdef JUMPSCROLL
        !           329:        }
        !           330: #endif JUMPSCROLL
        !           331:        /* adjust screen->buf */
        !           332:        ScrnDeleteLine(screen->buf, bottom, screen->cur_row, n,
        !           333:                        screen->max_col + 1);
        !           334: }
        !           335: 
        !           336: /*
        !           337:  * Insert n blanks at the cursor's position, no wraparound.
        !           338:  */
        !           339: InsertChar (screen, n)
        !           340: register Screen *screen;
        !           341: register int n;
        !           342: {
        !           343:        register int width = n * screen->f_width;
        !           344: 
        !           345: #ifdef JUMPSCROLL
        !           346:     if(!AddToRefresh(screen)) {
        !           347:        if(screen->scroll_amt)
        !           348:                FlushScroll(screen);
        !           349: #endif JUMPSCROLL
        !           350: 
        !           351:        screen->do_wrap = 0;
        !           352: 
        !           353:        if (screen->incopy)
        !           354:                CopyWait (screen);
        !           355:        screen->incopy = -1;
        !           356: 
        !           357:        XMoveArea(screen->window,
        !           358:                     CursorX (screen), CursorY (screen),
        !           359:                     CursorX (screen) + width, CursorY (screen),
        !           360:                     screen->width - (screen->cur_col + n) * screen->f_width,
        !           361:                     screen->f_height);
        !           362:        XTileSet(screen->window,
        !           363:                     CursorX (screen), CursorY (screen),
        !           364:                     width, screen->f_height, screen->bgndtile);
        !           365: 
        !           366: #ifdef JUMPSCROLL
        !           367:        }
        !           368: #endif JUMPSCROLL
        !           369:        /* adjust screen->buf */
        !           370:        ScrnInsertChar(screen->buf, screen->cur_row, screen->cur_col, n,
        !           371:                        screen->max_col + 1);
        !           372: }
        !           373: 
        !           374: /*
        !           375:  * Deletes n chars at the cursor's position, no wraparound.
        !           376:  */
        !           377: DeleteChar (screen, n)
        !           378: register Screen *screen;
        !           379: register int   n;
        !           380: {
        !           381:        register int width; 
        !           382: 
        !           383:        if (screen->cur_col + n > screen->max_col + 1)
        !           384:                n = screen->max_col + 1 - screen->cur_col;
        !           385: 
        !           386: #ifdef JUMPSCROLL
        !           387:     if(!AddToRefresh(screen)) {
        !           388:        if(screen->scroll_amt)
        !           389:                FlushScroll(screen);
        !           390: #endif JUMPSCROLL
        !           391: 
        !           392:        width = n * screen->f_width;
        !           393: 
        !           394:        screen->do_wrap = 0;
        !           395: 
        !           396:        if (screen->incopy)
        !           397:                CopyWait (screen);
        !           398:        screen->incopy = -1;
        !           399: 
        !           400:        XMoveArea(screen->window,
        !           401:                     CursorX (screen) + width, CursorY (screen),
        !           402:                     CursorX (screen), CursorY (screen),
        !           403:                     screen->width - (screen->cur_col + n) * screen->f_width,
        !           404:                     screen->f_height);
        !           405:        XTileSet (screen->window,
        !           406:                     screen->border + screen->width - width, CursorY (screen),
        !           407:                     width, screen->f_height, screen->bgndtile);
        !           408: 
        !           409: #ifdef JUMPSCROLL
        !           410:        }
        !           411: #endif JUMPSCROLL
        !           412:        /* adjust screen->buf */
        !           413:        ScrnDeleteChar (screen->buf, screen->cur_row, screen->cur_col, n,
        !           414:                        screen->max_col + 1);
        !           415: 
        !           416: }
        !           417: 
        !           418: /*
        !           419:  * Clear from cursor position to beginning of display, inclusive.
        !           420:  */
        !           421: ClearAbove (screen)
        !           422: register Screen *screen;
        !           423: {
        !           424: #ifdef JUMPSCROLL
        !           425:        if(screen->scroll_amt)
        !           426:                FlushScroll(screen);
        !           427: #endif JUMPSCROLL
        !           428:        ClearLeft(screen);
        !           429:        
        !           430:        XTileSet(screen->window, screen->border, 0,
        !           431:                screen->width, CursorY (screen), screen->bgndtile);
        !           432:        ClearBufRows(screen, 0, screen->cur_row - 1);
        !           433: }
        !           434: 
        !           435: /*
        !           436:  * Clear from cursor position to end of display, inclusive.
        !           437:  */
        !           438: ClearBelow (screen)
        !           439: register Screen *screen;
        !           440: {
        !           441:        register int sy = CursorY (screen) + screen->f_height;
        !           442: 
        !           443: #ifdef JUMPSCROLL
        !           444:        if(screen->scroll_amt)
        !           445:                FlushScroll(screen);
        !           446: #endif JUMPSCROLL
        !           447:        ClearRight(screen);
        !           448:        XTileSet(screen->window, screen->border, sy,
        !           449:             screen->width, screen->height - sy + screen->border, 
        !           450:             screen->bgndtile);
        !           451:        ClearBufRows(screen, screen->cur_row + 1, screen->max_row);
        !           452: }
        !           453: 
        !           454: /* 
        !           455:  * Clear last part of cursor's line, inclusive.
        !           456:  */
        !           457: ClearRight (screen)
        !           458: register Screen *screen;
        !           459: {
        !           460:        screen->do_wrap = 0;
        !           461: 
        !           462: #ifdef JUMPSCROLL
        !           463:     if(!AddToRefresh(screen)) {
        !           464:        if(screen->scroll_amt)
        !           465:                FlushScroll(screen);
        !           466: #endif JUMPSCROLL
        !           467:        XTileSet(screen->window,
        !           468:             CursorX (screen), CursorY (screen),
        !           469:             screen->width-screen->cur_col * screen->f_width,screen->f_height,
        !           470:             screen->bgndtile);
        !           471: #ifdef JUMPSCROLL
        !           472:     }
        !           473: #endif JUMPSCROLL
        !           474:        bzero((char *)(screen->buf [screen->cur_row] + screen->cur_col),
        !           475:               sizeof (short) * (screen->max_col - screen->cur_col + 1));
        !           476: }
        !           477: 
        !           478: /*
        !           479:  * Clear first part of cursor's line, inclusive.
        !           480:  */
        !           481: ClearLeft (screen)
        !           482: register Screen *screen;
        !           483: {
        !           484:        screen->do_wrap = 0;
        !           485: 
        !           486: #ifdef JUMPSCROLL
        !           487:     if(!AddToRefresh(screen)) {
        !           488:        if(screen->scroll_amt)
        !           489:                FlushScroll(screen);
        !           490: #endif JUMPSCROLL
        !           491: 
        !           492:        XTileSet (screen->window,
        !           493:             screen->border, CursorY (screen),
        !           494:             (screen->cur_col + 1) * screen->f_width,
        !           495:             screen->f_height, screen->bgndtile);
        !           496: #ifdef JUMPSCROLL
        !           497:     }
        !           498: #endif JUMPSCROLL
        !           499:        bzero ((char *)screen->buf [screen->cur_row],
        !           500:                sizeof (short) * (screen->cur_col + 1));
        !           501: }
        !           502: 
        !           503: /* 
        !           504:  * Erase the cursor's line.
        !           505:  */
        !           506: ClearLine(screen)
        !           507: register Screen *screen;
        !           508: {
        !           509:        screen->do_wrap = 0;
        !           510: 
        !           511: #ifdef JUMPSCROLL
        !           512:     if(!AddToRefresh(screen)) {
        !           513:        if(screen->scroll_amt)
        !           514:                FlushScroll(screen);
        !           515: #endif JUMPSCROLL
        !           516:        XTileSet (screen->window,
        !           517:             screen->border, CursorY (screen),
        !           518:             screen->width, screen->f_height, screen->bgndtile);
        !           519: #ifdef JUMPSCROLL
        !           520:     }
        !           521: #endif JUMPSCROLL
        !           522:        bzero ((char *)screen->buf [screen->cur_row],
        !           523:                sizeof (short) * (screen->max_col + 1));
        !           524: }
        !           525: 
        !           526: ClearScreen(screen)
        !           527: register Screen *screen;
        !           528: {
        !           529:        screen->do_wrap = 0;
        !           530:        
        !           531: #ifdef JUMPSCROLL
        !           532:        if(screen->scroll_amt)
        !           533:                FlushScroll(screen);
        !           534: #endif JUMPSCROLL
        !           535:        XClear(screen->window);
        !           536:        ClearBufRows (screen, 0, screen->max_row);
        !           537: }
        !           538: 
        !           539: CopyWait(screen)
        !           540: register Screen *screen;
        !           541: {
        !           542:        XEvent reply;
        !           543:        XEvent *rep = &reply;
        !           544: 
        !           545:        while (1) {
        !           546:                XWindowEvent (screen->window, ExposeRegion|ExposeCopy, &reply);
        !           547:                switch (reply.type) {
        !           548:                case ExposeRegion:
        !           549:                        if (((XExposeEvent *)rep)->detail == ExposeCopy &&
        !           550:                            screen->incopy <= 0) {
        !           551:                                screen->incopy = 1;
        !           552:                                if (screen->scrolls > 0)
        !           553:                                        screen->scrolls--;
        !           554:                        }
        !           555:                        HandleExposure (screen, &reply);
        !           556:                        break;
        !           557:                case ExposeCopy:
        !           558:                        if (screen->incopy <= 0 && screen->scrolls > 0)
        !           559:                                screen->scrolls--;
        !           560:                        if (screen->scrolls == 0) {
        !           561:                                screen->incopy = 0;
        !           562:                                return;
        !           563:                        }
        !           564:                        screen->incopy = -1;
        !           565:                        break;
        !           566:                }
        !           567:        }
        !           568: }
        !           569: /*
        !           570:  * This routine handles exposure events
        !           571:  */
        !           572: HandleExposure (screen, reply)
        !           573: register Screen *screen;
        !           574: register XExposeEvent *reply;
        !           575: {
        !           576:        int toprow, leftcol, nrows, ncols;
        !           577:        extern Terminal term;   /* kludge */
        !           578:        XExposeRegionEvent event;
        !           579: 
        !           580:        toprow = (reply->y - screen->border) / screen->f_height;
        !           581:        leftcol = (reply->x - screen->border) / screen->f_width;
        !           582:        nrows = (reply->y + reply->height - 1 - screen->border) /
        !           583:                        screen->f_height - toprow + 1;
        !           584:        ncols = (reply->x + reply->width - 1 - screen->border) /
        !           585:                        screen->f_width - leftcol + 1;
        !           586:        toprow -= screen->scrolls;
        !           587:        if (toprow < 0) {
        !           588:                nrows += toprow;
        !           589:                toprow = 0;
        !           590:        }
        !           591:        if (toprow + nrows - 1 > screen->max_row)
        !           592:                nrows = screen->max_row - toprow + 1;
        !           593:        if (leftcol + ncols - 1 > screen->max_col)
        !           594:                ncols = screen->max_col - leftcol + 1;
        !           595: 
        !           596:        if (nrows > 0 && ncols > 0) {
        !           597:                if (screen->TekEmu && reply->detail != ExposeCopy)
        !           598:                        /* Clear to avoid possible dangling cursor */
        !           599:                        XTileSet (screen->window,
        !           600:                             leftcol * screen->f_width + screen->border,
        !           601:                             toprow * screen->f_height + screen->border,
        !           602:                             ncols * screen->f_width,
        !           603:                             nrows * screen->f_height,
        !           604:                             screen->bgndtile);
        !           605:                ScrnRefresh (screen, toprow, leftcol, nrows, ncols);
        !           606:                /* only do the tek refresh on the last refresh event */
        !           607:                if (screen->TekEmu) {
        !           608:                        XSync(0);       /* make sure they are all here */
        !           609:                        if (XPending() != 0) {
        !           610:                                XPeekEvent(&event);
        !           611:                                if (event.type != ExposeRegion) {
        !           612:                                        if (reply->detail != ExposeCopy)
        !           613:                                                TekRefresh(&term);
        !           614:                                }
        !           615:                        }
        !           616:                        else {
        !           617:                                if (reply->detail != ExposeCopy)
        !           618:                                        TekRefresh (&term);
        !           619:                        }
        !           620:                }
        !           621:                if (screen->cur_row >= toprow &&
        !           622:                    screen->cur_row < toprow + nrows &&
        !           623:                    screen->cur_col >= leftcol &&
        !           624:                    screen->cur_col < leftcol + ncols)
        !           625:                        return (1);
        !           626:        }
        !           627:        return (0);
        !           628: }
        !           629: 
        !           630: Panic(s, a)
        !           631: char   *s;
        !           632: {
        !           633:        fprintf(stderr, "PANIC! ");
        !           634:        fprintf(stderr, s, a);
        !           635:        fprintf(stderr, "\r\n");
        !           636:        fflush(stderr);
        !           637: }
        !           638: 
        !           639: Error ()
        !           640: {
        !           641:        fprintf (stderr, "Error %d: ", errno);
        !           642:        perror ("");
        !           643:        Cleanup(66);
        !           644: }
        !           645: 
        !           646: /*
        !           647:  * cleanup by sending SIGHUP to client processes
        !           648:  */
        !           649: Cleanup (code)
        !           650: int code;
        !           651: {
        !           652:        extern Terminal term;
        !           653:        register Screen *screen;
        !           654:        register long pgrp;
        !           655:        screen = &term.screen;
        !           656:        if (screen->pid > 1) {
        !           657:                pgrp = getpgrp(screen->pid);
        !           658:                if (pgrp > 1) killpg(pgrp, SIGHUP);
        !           659:        }
        !           660:        exit(code);
        !           661: }
        !           662: 
        !           663: /*
        !           664:  * sets the value of var to be arg in the Unix 4.2 BSD environment env.
        !           665:  * Var should end with '=' (bindings are of the form "var=value").
        !           666:  * This procedure assumes the memory for the first level of environ
        !           667:  * was allocated using malloc.
        !           668:  */
        !           669: Setenv (var, value)
        !           670: register char *var, *value;
        !           671: {
        !           672:        extern char **environ;
        !           673:        register int index = 0;
        !           674: 
        !           675:        while (environ [index] != NULL) {
        !           676:            if (strncmp (environ [index], var, strlen (var)) == 0) {
        !           677:                /* found it */
        !           678:                environ [index] = (char *) malloc (strlen (var) + strlen (value));
        !           679:                strcpy (environ [index], var);
        !           680:                strcat (environ [index], value);
        !           681:                return;
        !           682:            }
        !           683:            index ++;
        !           684:        }
        !           685: 
        !           686:        if (debug) printf ("expanding env\n");
        !           687:        environ = (char **) realloc((char *)environ, sizeof(char *) * (index+2));
        !           688:        if (environ == NULL) {
        !           689:            fprintf (stderr, "Setenv: malloc out of memory\n");
        !           690:            exit (1);
        !           691:        }
        !           692: 
        !           693:        environ [index] = (char *) malloc (strlen (var) + strlen (value));
        !           694:        strcpy (environ [index], var);
        !           695:        strcat (environ [index], value);
        !           696:        environ [++index] = NULL;
        !           697: }
        !           698: 
        !           699: /*
        !           700:  * returns a pointer to the first occurrence of s2 in s1,
        !           701:  * or NULL if there are none.
        !           702:  */
        !           703: char *strindex (s1, s2)
        !           704: register char  *s1, *s2;
        !           705: {
        !           706:        register char   *s3;
        !           707:        char            *index();
        !           708: 
        !           709:        while ((s3=index(s1, *s2)) != NULL) {
        !           710:                if (strncmp(s3, s2, strlen(s2)) == 0)
        !           711:                        return (s3);
        !           712:                s1 = ++s3;
        !           713:        }
        !           714:        return (NULL);
        !           715: }

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