Return to screen.c CVS log

Up to [Research Unix] / researchv9 / X11 / src / X.V11R1 / clients / xterm

Annotation of researchv9/X11/src/X.V11R1/clients/xterm/screen.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     $Source: /orpheus/u1/X11/clients/xterm/RCS/screen.c,v $
        !             3:  *     $Header: screen.c,v 1.9 87/08/13 16:02:42 guarino Exp $
        !             4:  */
        !             5: 
        !             6: #include <X11/copyright.h>
        !             7: 
        !             8: /*
        !             9:  * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
        !            10:  *
        !            11:  *                         All Rights Reserved
        !            12:  *
        !            13:  * Permission to use, copy, modify, and distribute this software and its
        !            14:  * documentation for any purpose and without fee is hereby granted,
        !            15:  * provided that the above copyright notice appear in all copies and that
        !            16:  * both that copyright notice and this permission notice appear in
        !            17:  * supporting documentation, and that the name of Digital Equipment
        !            18:  * Corporation not be used in advertising or publicity pertaining to
        !            19:  * distribution of the software without specific, written prior permission.
        !            20:  *
        !            21:  *
        !            22:  * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            23:  * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            24:  * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            25:  * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            26:  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            27:  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            28:  * SOFTWARE.
        !            29:  */
        !            30: 
        !            31: /* screen.c */
        !            32: 
        !            33: #ifndef lint
        !            34: static char rcs_id[] = "$Header: screen.c,v 1.9 87/08/13 16:02:42 guarino Exp $";
        !            35: #endif lint
        !            36: 
        !            37: #include <X11/Xlib.h>
        !            38: #include <stdio.h>
        !            39: #include <sys/ioctl.h>
        !            40: #include <signal.h>
        !            41: #include "ptyx.h"
        !            42: #include "error.h"
        !            43: 
        !            44: extern char *calloc();
        !            45: extern char *malloc();
        !            46: extern char *realloc();
        !            47: extern void bcopy();
        !            48: extern void free();
        !            49: 
        !            50: ScrnBuf Allocate (nrow, ncol)
        !            51: /*
        !            52:    allocates memory for a 2-dimensional array of chars and returns a pointer
        !            53:    thereto
        !            54:    each line is formed from a pair of char arrays.  The first (even) one is
        !            55:    the actual character array and the second (odd) one is the attributes.
        !            56:  */
        !            57: register int nrow, ncol;
        !            58: {
        !            59:        register ScrnBuf base;
        !            60: 
        !            61:        if ((base = (ScrnBuf) calloc ((unsigned)(nrow *= 2), sizeof (char *))) == 0)
        !            62:                SysError (ERROR_SCALLOC);
        !            63: 
        !            64:        for (nrow--; nrow >= 0; nrow--)
        !            65:                if ((base [nrow] = calloc ((unsigned)ncol, sizeof(char))) == 0)
        !            66:                        SysError (ERROR_SCALLOC2);
        !            67: 
        !            68:        return (base);
        !            69: }
        !            70: 
        !            71: ScreenWrite (screen, str, flags, length)
        !            72: /*
        !            73:    Writes str into buf at row row and column col.  Characters are set to match
        !            74:    flags.
        !            75:  */
        !            76: TScreen *screen;
        !            77: char *str;
        !            78: register unsigned flags;
        !            79: register int length;           /* length of string */
        !            80: {
        !            81:        register char *att;
        !            82:        register int avail  = screen->max_col - screen->cur_col + 1;
        !            83:        register char *col;
        !            84: 
        !            85:        if (length > avail)
        !            86:            length = avail;
        !            87:        if (length <= 0)
        !            88:                return;
        !            89: 
        !            90:        col = screen->buf[avail = 2 * screen->cur_row] + screen->cur_col;
        !            91:        att = screen->buf[avail + 1] + screen->cur_col;
        !            92:        flags &= ATTRIBUTES;
        !            93:        bcopy(str, col, length);
        !            94:        while(length-- > 0)
        !            95:                *att++ = flags;
        !            96: }
        !            97: 
        !            98: ScrnInsertLine (sb, last, where, n, size)
        !            99: /*
        !           100:    Inserts n blank lines at sb + where, treating last as a bottom margin.
        !           101:    Size is the size of each entry in sb.
        !           102:    Requires: 0 <= where < where + n <= last
        !           103:             n <= MAX_ROWS
        !           104:  */
        !           105: register ScrnBuf sb;
        !           106: int last;
        !           107: register int where, n, size;
        !           108: {
        !           109:        register int i;
        !           110:        char *save [2 * MAX_ROWS];
        !           111: 
        !           112:        /* save n lines at bottom */
        !           113:        bcopy ((char *) &sb [2 * (last -= n - 1)], (char *) save,
        !           114:                2 * sizeof (char *) * n);
        !           115:        
        !           116:        /* clear contents of old rows */
        !           117:        for (i = 2 * n - 1; i >= 0; i--)
        !           118:                bzero ((char *) save [i], size);
        !           119: 
        !           120:        /* move down lines */
        !           121:        bcopy ((char *) &sb [2 * where], (char *) &sb [2 * (where + n)],
        !           122:                2 * sizeof (char *) * (last - where));
        !           123: 
        !           124:        /* reuse storage for new lines at where */
        !           125:        bcopy ((char *)save, (char *) &sb[2 * where], 2 * sizeof(char *) * n);
        !           126: }
        !           127: 
        !           128: 
        !           129: ScrnDeleteLine (sb, last, where, n, size)
        !           130: /*
        !           131:    Deletes n lines at sb + where, treating last as a bottom margin.
        !           132:    Size is the size of each entry in sb.
        !           133:    Requires 0 <= where < where + n < = last
        !           134:            n <= MAX_ROWS
        !           135:  */
        !           136: register ScrnBuf sb;
        !           137: register int n, last, size;
        !           138: int where;
        !           139: {
        !           140:        register int i;
        !           141:        char *save [2 * MAX_ROWS];
        !           142: 
        !           143:        /* save n lines at where */
        !           144:        bcopy ((char *) &sb[2 * where], (char *)save, 2 * sizeof(char *) * n);
        !           145: 
        !           146:        /* clear contents of old rows */
        !           147:        for (i = 2 * n - 1 ; i >= 0 ; i--)
        !           148:                bzero ((char *) save [i], size);
        !           149: 
        !           150:        /* move up lines */
        !           151:        bcopy ((char *) &sb[2 * (where + n)], (char *) &sb[2 * where],
        !           152:                2 * sizeof (char *) * ((last -= n - 1) - where));
        !           153: 
        !           154:        /* reuse storage for new bottom lines */
        !           155:        bcopy ((char *)save, (char *) &sb[2 * last],
        !           156:                2 * sizeof(char *) * n);
        !           157: }
        !           158: 
        !           159: 
        !           160: ScrnInsertChar (sb, row, col, n, size)
        !           161: /*
        !           162:    Inserts n blanks in sb at row, col.  Size is the size of each row.
        !           163:  */
        !           164: ScrnBuf sb;
        !           165: int row, size;
        !           166: register int col, n;
        !           167: {
        !           168:        register int i, j;
        !           169:        register char *ptr = sb [2 * row];
        !           170:        register char *att = sb [2 * row + 1];
        !           171: 
        !           172:        for (i = size - 1; i >= col + n; i--) {
        !           173:                ptr[i] = ptr[j = i - n];
        !           174:                att[i] = att[j];
        !           175:        }
        !           176: 
        !           177:        bzero (ptr + col, n);
        !           178:        bzero (att + col, n);
        !           179: }
        !           180: 
        !           181: 
        !           182: ScrnDeleteChar (sb, row, col, n, size)
        !           183: /*
        !           184:    Deletes n characters in sb at row, col. Size is the size of each row.
        !           185:  */
        !           186: ScrnBuf sb;
        !           187: register int row, size;
        !           188: register int n, col;
        !           189: {
        !           190:        register char *ptr = sb[2 * row];
        !           191:        register char *att = sb[2 * row + 1];
        !           192:        register nbytes = (size - n - col);
        !           193: 
        !           194:        bcopy (ptr + col + n, ptr + col, nbytes);
        !           195:        bcopy (att + col + n, att + col, nbytes);
        !           196:        bzero (ptr + size - n, n);
        !           197:        bzero (att + size - n, n);
        !           198: }
        !           199: 
        !           200: 
        !           201: ScrnRefresh (screen, toprow, leftcol, nrows, ncols)
        !           202: /*
        !           203:    Repaints the area enclosed by the parameters.
        !           204:    Requires: (toprow, leftcol), (toprow + nrows, leftcol + ncols) are
        !           205:             coordinates of characters in screen;
        !           206:             nrows and ncols positive.
        !           207:  */
        !           208: register TScreen *screen;
        !           209: int toprow, leftcol, nrows, ncols;
        !           210: {
        !           211:        int y = toprow * FontHeight(screen) + screen->border +
        !           212:                screen->fnt_norm->max_bounds.ascent;
        !           213:        register int row;
        !           214:        register int topline = screen->topline;
        !           215:        int maxrow = toprow + nrows - 1;
        !           216:        int scrollamt = screen->scroll_amt;
        !           217:        int max = screen->max_row;
        !           218:        
        !           219: 
        !           220:        if(screen->cursor_col >= leftcol && screen->cursor_col <=
        !           221:         (leftcol + ncols - 1) && screen->cursor_row >= toprow + topline &&
        !           222:         screen->cursor_row <= maxrow + topline)
        !           223:                screen->cursor_state = OFF;
        !           224:        for (row = toprow; row <= maxrow; y += FontHeight(screen), row++) {
        !           225:           register char *chars;
        !           226:           register char *att;
        !           227:           register int col = leftcol;
        !           228:           int maxcol = leftcol + ncols - 1;
        !           229:           int lastind;
        !           230:           int flags;
        !           231:           int x, n;
        !           232:           GC gc;
        !           233: 
        !           234:           lastind = row - scrollamt;
        !           235:           if (lastind < 0 || lastind > max)
        !           236:                continue;
        !           237:           chars = screen->buf [2 * (lastind + topline)];
        !           238:           att = screen->buf [2 * (lastind + topline) + 1];
        !           239: 
        !           240:           while (col <= maxcol && (att[col] & ~BOLD) == 0 &&
        !           241:            (chars[col] & ~040) == 0)
        !           242:                col++;
        !           243: 
        !           244:           while (col <= maxcol && (att[maxcol] & ~BOLD) == 0 &&
        !           245:            (chars[maxcol] & ~040) == 0)
        !           246:                maxcol--;
        !           247: 
        !           248:           if (col > maxcol) continue;
        !           249: 
        !           250:           flags = att[col];
        !           251: 
        !           252:           if ((flags & INVERSE) != 0)
        !           253:               if (flags & BOLD) gc = screen->reverseboldGC;
        !           254:               else gc = screen->reverseGC;
        !           255:           else 
        !           256:               if (flags & BOLD) gc = screen->normalboldGC;
        !           257:               else gc = screen->normalGC;
        !           258: 
        !           259:           x = CursorX(screen, col);
        !           260:           lastind = col;
        !           261: 
        !           262:           for (; col <= maxcol; col++) {
        !           263:                if (att[col] != flags) {
        !           264:                   XDrawImageString(screen->display, TextWindow(screen), 
        !           265:                                gc, x, y, &chars[lastind], n = col - lastind);
        !           266:                   if((flags & BOLD) && screen->enbolden)
        !           267:                        XDrawString(screen->display, TextWindow(screen), 
        !           268:                         gc, x + 1, y, &chars[lastind], n);
        !           269:                   if(flags & UNDERLINE) 
        !           270:                        XDrawLine(screen->display, TextWindow(screen), 
        !           271:                         gc, x, y+1, x+n*FontWidth(screen), y+1);
        !           272: 
        !           273:                   x += (col - lastind) * FontWidth(screen);
        !           274: 
        !           275:                   lastind = col;
        !           276: 
        !           277:                   flags = att[col];
        !           278: 
        !           279:                   if ((flags & INVERSE) != 0)
        !           280:                        if (flags & BOLD) gc = screen->reverseboldGC;
        !           281:                        else gc = screen->reverseGC;
        !           282:                    else 
        !           283:                         if (flags & BOLD) gc = screen->normalboldGC;
        !           284:                         else gc = screen->normalGC;
        !           285:                }
        !           286: 
        !           287:                if(chars[col] == 0)
        !           288:                        chars[col] = ' ';
        !           289:           }
        !           290: 
        !           291: 
        !           292:           if ((flags & INVERSE) != 0)
        !           293:               if (flags & BOLD) gc = screen->reverseboldGC;
        !           294:               else gc = screen->reverseGC;
        !           295:           else 
        !           296:               if (flags & BOLD) gc = screen->normalboldGC;
        !           297:               else gc = screen->normalGC;
        !           298:           XDrawImageString(screen->display, TextWindow(screen), gc, 
        !           299:                 x, y, &chars[lastind], n = col - lastind);
        !           300:           if((flags & BOLD) && screen->enbolden)
        !           301:                XDrawString(screen->display, TextWindow(screen), gc,
        !           302:                x + 1, y, &chars[lastind], n);
        !           303:           if(flags & UNDERLINE) 
        !           304:                XDrawLine(screen->display, TextWindow(screen), gc, 
        !           305:                 x, y+1, x + n * FontWidth(screen), y+1);
        !           306:        }
        !           307: }
        !           308: 
        !           309: ClearBufRows (screen, first, last)
        !           310: /*
        !           311:    Sets the rows first though last of the buffer of screen to spaces.
        !           312:    Requires first <= last; first, last are rows of screen->buf.
        !           313:  */
        !           314: register TScreen *screen;
        !           315: register int first, last;
        !           316: {
        !           317:        first *= 2;
        !           318:        last = 2 * last + 1;
        !           319:        while (first <= last)
        !           320:                bzero (screen->buf [first++], (screen->max_col + 1));
        !           321: }
        !           322: 
        !           323: ScreenResize (screen, width, height, flags)
        !           324: /*
        !           325:    Resizes screen:
        !           326:    1. If new window would have fractional characters, sets window size so as to
        !           327:       discard fractional characters and returns -1.
        !           328:       Minimum screen size is 1 X 1.
        !           329:       Note that this causes another ExposeWindow event.
        !           330:    2. Enlarges screen->buf if necessary.  New space is appended to the bottom
        !           331:       and to the right
        !           332:    3. Reduces  screen->buf if necessary.  Old space is removed from the bottom
        !           333:       and from the right
        !           334:    4. Cursor is positioned as closely to its former position as possible
        !           335:    5. Sets screen->max_row and screen->max_col to reflect new size
        !           336:    6. Maintains the inner border.
        !           337:    7. Clears origin mode and sets scrolling region to be entire screen.
        !           338:    8. Returns 0
        !           339:  */
        !           340: register TScreen *screen;
        !           341: int width, height;
        !           342: unsigned *flags;
        !           343: {
        !           344:        register int rows, cols;
        !           345:        register int index;
        !           346:        register int savelines;
        !           347:        register ScrnBuf sb = screen->allbuf;
        !           348:        register ScrnBuf ab = screen->altbuf;
        !           349:        register int x;
        !           350:        register int border = 2 * screen->border;
        !           351:        register int i, j, k;
        !           352: #ifdef sun
        !           353: #ifdef TIOCSSIZE
        !           354:        struct ttysize ts;
        !           355: #endif TIOCSSIZE
        !           356: #else sun
        !           357: #ifdef TIOCSWINSZ
        !           358:        struct winsize ws;
        !           359: #endif TIOCSWINSZ
        !           360: #endif sun
        !           361: 
        !           362:        /* round so that it is unlikely the screen will change size on  */
        !           363:        /* small mouse movements.                                       */
        !           364:        rows = (height + FontHeight(screen) / 2 - border) /
        !           365:         FontHeight(screen);
        !           366:        cols = (width + FontWidth(screen) / 2 - border - screen->scrollbar) /
        !           367:         FontWidth(screen);
        !           368:        if (rows < 1) rows = 1;
        !           369:        if (cols < 1) cols = 1;
        !           370: 
        !           371:        if ((width - border - screen->scrollbar) % FontWidth(screen)
        !           372:         != 0 || (height - border) % FontHeight(screen) != 0) {
        !           373:                XResizeWindow(
        !           374:                    screen->display,
        !           375:                    TextWindow(screen),
        !           376:                    (unsigned) cols * FontWidth(screen) + border
        !           377:                        + screen->scrollbar,
        !           378:                    (unsigned) rows * FontHeight(screen) + border);
        !           379:                return (-1);
        !           380:        }
        !           381: 
        !           382:        /* change buffers if the screen has changed size */
        !           383:        if (screen->max_row != rows - 1 || screen->max_col != cols - 1) {
        !           384:                if(screen->cursor_state)
        !           385:                        HideCursor();
        !           386:                savelines = screen->scrollWindow ? screen->savelines : 0;
        !           387:                j = screen->max_col + 1;
        !           388:                i = cols - j;
        !           389:                k = screen->max_row;
        !           390:                if(rows < k)
        !           391:                        k = rows;
        !           392:                if(ab) {
        !           393:                        /* resize current lines in alternate buf */
        !           394:                        for (index = x = 0; index <= k; x += 2, index++) {
        !           395:                                if ((ab[x] = realloc(ab[x], (unsigned) cols)) == NULL)
        !           396:                                        SysError(ERROR_SREALLOC);
        !           397:                                if((ab[x + 1] = realloc(ab[x + 1], (unsigned) cols)) ==
        !           398:                                 NULL)
        !           399:                                        SysError (ERROR_SREALLOC2);
        !           400:                                if (cols > j) {
        !           401:                                        bzero (ab [x] + j, i);
        !           402:                                        bzero (ab [x + 1] + j, i);
        !           403:                                }
        !           404:                        }
        !           405:                        /* discard excess bottom rows in alt buf */
        !           406:                        for (index = rows, x = 2 * k ; index <=
        !           407:                         screen->max_row; x += 2, index++) {
        !           408:                           free (ab [x]);
        !           409:                           free (ab [x + 1]);
        !           410:                        }
        !           411:                }
        !           412:                /* resize current lines */
        !           413:                 k += savelines;
        !           414:                for (index = x = 0; index <= k; x += 2, index++) {
        !           415:                        if ((sb[x] = realloc(sb[x], (unsigned) cols)) == NULL)
        !           416:                                SysError(ERROR_SREALLOC3);
        !           417:                        if((sb[x + 1] = realloc(sb[x + 1], (unsigned) cols)) == NULL)
        !           418:                                SysError (ERROR_SREALLOC4);
        !           419:                        if (cols > j) {
        !           420:                                bzero (sb [x] + j, i);
        !           421:                                bzero (sb [x + 1] + j, i);
        !           422:                        }
        !           423:                }
        !           424:                /* discard excess bottom rows */
        !           425:                for (index = rows, x = 2 * k; index <= screen->max_row;
        !           426:                 x += 2, index++) {
        !           427:                   free (sb [x]);
        !           428:                   free (sb [x + 1]);
        !           429:                }
        !           430:                if(ab) {
        !           431:                    if((ab = (ScrnBuf)realloc((char *)ab,
        !           432:                     (unsigned) 2 * sizeof(char *) * rows)) == NULL)
        !           433:                        SysError (ERROR_RESIZE);
        !           434:                    screen->altbuf = ab;
        !           435:                }
        !           436:                k = 2 * (rows + savelines);
        !           437:                /* resize sb */
        !           438:                if((sb = (ScrnBuf)realloc((char *) sb, (unsigned) k * sizeof(char *)))
        !           439:                  == NULL)
        !           440:                        SysError (ERROR_RESIZE2);
        !           441:                screen->allbuf = sb;
        !           442:                screen->buf = &sb[2 * savelines];
        !           443:        
        !           444:                if(ab) {
        !           445:                        /* create additional bottom rows as required in alt */
        !           446:                        for (index = screen->max_row + 1, x = 2 * index ;
        !           447:                         index < rows; x += 2, index++) {
        !           448:                           if((ab[x] = calloc ((unsigned) cols, sizeof(char))) == NULL)
        !           449:                                SysError(ERROR_RESIZROW);
        !           450:                           if((ab[x + 1] = calloc ((unsigned) cols, sizeof(char))) == NULL)
        !           451:                                SysError(ERROR_RESIZROW2);
        !           452:                        }
        !           453:                }
        !           454:                /* create additional bottom rows as required */
        !           455:                for (index = screen->max_row + 1, x = 2 * (index + savelines) ;
        !           456:                 index < rows; x += 2, index++) {
        !           457:                   if((sb[x] = calloc ((unsigned) cols, sizeof(char))) == NULL)
        !           458:                        SysError(ERROR_RESIZROW3);
        !           459:                   if((sb[x + 1] = calloc ((unsigned) cols, sizeof(char))) == NULL)
        !           460:                        SysError(ERROR_RESIZROW4);
        !           461:                }
        !           462: 
        !           463:                screen->max_row = rows - 1;
        !           464:                screen->max_col = cols - 1;
        !           465:        
        !           466:                /* adjust scrolling region */
        !           467:                screen->top_marg = 0;
        !           468:                screen->bot_marg = screen->max_row;
        !           469:                *flags &= ~ORIGIN;
        !           470:        
        !           471:                if (screen->cur_row > screen->max_row)
        !           472:                        screen->cur_row = screen->max_row;
        !           473:                if (screen->cur_col > screen->max_col)
        !           474:                        screen->cur_col = screen->max_col;
        !           475:        
        !           476:                screen->fullVwin.height = height - border;
        !           477:                screen->fullVwin.width = width - border - screen->scrollbar;
        !           478: 
        !           479:        } else if(FullHeight(screen) == height && FullWidth(screen) == width)
        !           480:                return(0);      /* nothing has changed at all */
        !           481: 
        !           482:        if(screen->scrollWindow)
        !           483:                ResizeScrollBar(screen->scrollWindow, -1, -1, height);
        !           484:        
        !           485:        screen->fullVwin.fullheight = height;
        !           486:        screen->fullVwin.fullwidth = width;
        !           487: #ifdef sun
        !           488: #ifdef TIOCSSIZE
        !           489:        /* Set tty's idea of window size */
        !           490:        ts.ts_lines = rows;
        !           491:        ts.ts_cols = cols;
        !           492:        ioctl (screen->respond, TIOCSSIZE, &ts);
        !           493: #ifdef SIGWINCH
        !           494:        if(screen->pid > 1)
        !           495:                killpg(getpgrp(screen->pid), SIGWINCH);
        !           496: #endif SIGWINCH
        !           497: #endif TIOCSSIZE
        !           498: #else sun
        !           499: #ifdef TIOCSWINSZ
        !           500:        /* Set tty's idea of window size */
        !           501:        ws.ws_row = rows;
        !           502:        ws.ws_col = cols;
        !           503:        ws.ws_xpixel = width;
        !           504:        ws.ws_ypixel = height;
        !           505:        ioctl (screen->respond, TIOCSWINSZ, (char *)&ws);
        !           506: #ifdef SIGWINCH
        !           507:        if(screen->pid > 1)
        !           508:                killpg(getpgrp((int)screen->pid), SIGWINCH);
        !           509: #endif SIGWINCH
        !           510: #endif TIOCSWINSZ
        !           511: #endif sun
        !           512:        return (0);
        !           513: }
        !           514: 
        !           515: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.