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Annotation of 43BSD/ucb/ex/ex_v.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char *sccsid = "@(#)ex_v.c      7.8 (Berkeley) 6/7/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "ex.h"
        !            12: #include "ex_re.h"
        !            13: #include "ex_tty.h"
        !            14: #include "ex_vis.h"
        !            15: 
        !            16: /*
        !            17:  * Entry points to open and visual from command mode processor.
        !            18:  * The open/visual code breaks down roughly as follows:
        !            19:  *
        !            20:  * ex_v.c      entry points, checking of terminal characteristics
        !            21:  *
        !            22:  * ex_vadj.c   logical screen control, use of intelligent operations
        !            23:  *             insert/delete line and coordination with screen image;
        !            24:  *             updating of screen after changes.
        !            25:  *
        !            26:  * ex_vget.c   input of single keys and reading of input lines
        !            27:  *             from the echo area, handling of \ escapes on input for
        !            28:  *             uppercase only terminals, handling of memory for repeated
        !            29:  *             commands and small saved texts from inserts and partline
        !            30:  *             deletes, notification of multi line changes in the echo
        !            31:  *             area.
        !            32:  *
        !            33:  * ex_vmain.c  main command decoding, some command processing.
        !            34:  *
        !            35:  * ex_voperate.c   decoding of operator/operand sequences and
        !            36:  *             contextual scans, implementation of word motions.
        !            37:  *
        !            38:  * ex_vops.c   major operator interfaces, undos, motions, deletes,
        !            39:  *             changes, opening new lines, shifts, replacements and yanks
        !            40:  *             coordinating logical and physical changes.
        !            41:  *
        !            42:  * ex_vops2.c  subroutines for operator interfaces in ex_vops.c,
        !            43:  *             insert mode, read input line processing at lowest level.
        !            44:  *
        !            45:  * ex_vops3.c  structured motion definitions of ( ) { } and [ ] operators,
        !            46:  *             indent for lisp routines, () and {} balancing. 
        !            47:  *
        !            48:  * ex_vput.c   output routines, clearing, physical mapping of logical cursor
        !            49:  *             positioning, cursor motions, handling of insert character
        !            50:  *             and delete character functions of intelligent and unintelligent
        !            51:  *             terminals, visual mode tracing routines (for debugging),
        !            52:  *             control of screen image and its updating.
        !            53:  *
        !            54:  * ex_vwind.c  window level control of display, forward and backward rolls,
        !            55:  *             absolute motions, contextual displays, line depth determination
        !            56:  */
        !            57: 
        !            58: jmp_buf venv;
        !            59: int    winch();
        !            60: 
        !            61: /*
        !            62:  * Enter open mode
        !            63:  */
        !            64: #ifdef u370
        !            65: char   atube[TUBESIZE+LBSIZE];
        !            66: #endif
        !            67: oop()
        !            68: {
        !            69:        register char *ic;
        !            70: #ifndef u370
        !            71:        char atube[TUBESIZE + LBSIZE];
        !            72: #endif
        !            73:        ttymode f;      /* mjm: was register */
        !            74:        int resize;
        !            75: 
        !            76:        if (resize = setjmp(venv)) {
        !            77:                setsize();
        !            78:                initev = (char *)0;
        !            79:                inopen = 0;
        !            80:                addr1 = addr2 = dot;
        !            81:        }
        !            82:        (void)signal(SIGWINCH, winch);
        !            83:        ovbeg();
        !            84:        if (peekchar() == '/') {
        !            85:                ignore(compile(getchar(), 1));
        !            86:                savere(scanre);
        !            87:                if (execute(0, dot) == 0)
        !            88:                        error("Fail|Pattern not found on addressed line");
        !            89:                ic = loc1;
        !            90:                if (ic > linebuf && *ic == 0)
        !            91:                        ic--;
        !            92:        } else {
        !            93:                getDOT();
        !            94:                ic = vskipwh(linebuf);
        !            95:        }
        !            96:        newline();
        !            97: 
        !            98:        /*
        !            99:         * If overstrike then have to HARDOPEN
        !           100:         * else if can move cursor up off current line can use CRTOPEN (~~vi1)
        !           101:         * otherwise (ugh) have to use ONEOPEN (like adm3)
        !           102:         */
        !           103:        if (OS && !EO)
        !           104:                bastate = HARDOPEN;
        !           105:        else if (CA || UP)
        !           106:                bastate = CRTOPEN;
        !           107:        else
        !           108:                bastate = ONEOPEN;
        !           109:        setwind();
        !           110: 
        !           111:        /*
        !           112:         * To avoid bombing on glass-crt's when the line is too long
        !           113:         * pretend that such terminals are 160 columns wide.
        !           114:         * If a line is too wide for display, we will dynamically
        !           115:         * switch to hardcopy open mode.
        !           116:         */
        !           117:        if (state != CRTOPEN)
        !           118:                WCOLS = TUBECOLS;
        !           119:        if (!inglobal)
        !           120:                savevis();
        !           121:        vok(atube);
        !           122:        if (state != CRTOPEN)
        !           123:                COLUMNS = WCOLS;
        !           124:        Outchar = vputchar;
        !           125:        f = ostart();
        !           126:        if (state == CRTOPEN) {
        !           127:                if (outcol == UKCOL)
        !           128:                        outcol = 0;
        !           129:                vmoveitup(1, 1);
        !           130:        } else
        !           131:                outline = destline = WBOT;
        !           132:        vshow(dot, NOLINE);
        !           133:        vnline(ic);
        !           134:        vmain();
        !           135:        if (state != CRTOPEN)
        !           136:                vclean();
        !           137:        Command = "open";
        !           138:        ovend(f);
        !           139:        (void)signal(SIGWINCH, SIG_DFL);
        !           140: }
        !           141: 
        !           142: ovbeg()
        !           143: {
        !           144: 
        !           145:        if (!value(OPEN))
        !           146:                error("Can't use open/visual unless open option is set");
        !           147:        if (inopen)
        !           148:                error("Recursive open/visual not allowed");
        !           149:        Vlines = lineDOL();
        !           150:        fixzero();
        !           151:        setdot();
        !           152:        pastwh();
        !           153:        dot = addr2;
        !           154: }
        !           155: 
        !           156: ovend(f)
        !           157:        ttymode f;
        !           158: {
        !           159: 
        !           160:        splitw++;
        !           161:        vgoto(WECHO, 0);
        !           162:        vclreol();
        !           163:        vgoto(WECHO, 0);
        !           164:        holdcm = 0;
        !           165:        splitw = 0;
        !           166:        ostop(f);
        !           167:        setoutt();
        !           168:        undvis();
        !           169:        COLUMNS = OCOLUMNS;
        !           170:        inopen = 0;
        !           171:        flusho();
        !           172:        netchHAD(Vlines);
        !           173: }
        !           174: 
        !           175: /*
        !           176:  * Enter visual mode
        !           177:  */
        !           178: vop()
        !           179: {
        !           180:        register int c;
        !           181: #ifndef u370
        !           182:        char atube[TUBESIZE + LBSIZE];
        !           183: #endif
        !           184:        ttymode f;      /* mjm: was register */
        !           185:        int resize;
        !           186: 
        !           187:        if (!CA && UP == NOSTR) {
        !           188:                if (initev) {
        !           189: toopen:
        !           190:                        merror("[Using open mode]");
        !           191:                        putNFL();
        !           192:                        oop();
        !           193:                        return;
        !           194:                }
        !           195:                error("Visual needs addressible cursor or upline capability");
        !           196:        }
        !           197:        if (OS && !EO) {
        !           198:                if (initev)
        !           199:                        goto toopen;
        !           200:                error("Can't use visual on a terminal which overstrikes");
        !           201:        }
        !           202:        if (!CL) {
        !           203:                if (initev)
        !           204:                        goto toopen;
        !           205:                error("Visual requires clear screen capability");
        !           206:        }
        !           207:        if (NS && !SF) {
        !           208:                if (initev)
        !           209:                        goto toopen;
        !           210:                error("Visual requires scrolling");
        !           211:        }
        !           212:        if (resize = setjmp(venv)) {
        !           213:                setsize();
        !           214:                initev = (char *)0;
        !           215:                inopen = 0;
        !           216:                addr1 = addr2 = dot;
        !           217:        }
        !           218:        (void)signal(SIGWINCH, winch);
        !           219:        ovbeg();
        !           220:        bastate = VISUAL;
        !           221:        c = 0;
        !           222:        if (any(peekchar(), "+-^."))
        !           223:                c = getchar();
        !           224:        pastwh();
        !           225:        vsetsiz(isdigit(peekchar()) ? getnum() : value(WINDOW));
        !           226:        setwind();
        !           227:        newline();
        !           228:        vok(atube);
        !           229:        if (!inglobal)
        !           230:                savevis();
        !           231:        Outchar = vputchar;
        !           232:        vmoving = 0;
        !           233:        f = ostart();
        !           234:        if (initev == 0) {
        !           235:                vcontext(dot, c);
        !           236:                vnline(NOSTR);
        !           237:        }
        !           238:        vmain();
        !           239:        Command = "visual";
        !           240:        ovend(f);
        !           241:        (void)signal(SIGWINCH, SIG_DFL);
        !           242: }
        !           243: 
        !           244: /*
        !           245:  * Hack to allow entry to visual with
        !           246:  * empty buffer since routines internally
        !           247:  * demand at least one line.
        !           248:  */
        !           249: fixzero()
        !           250: {
        !           251: 
        !           252:        if (dol == zero) {
        !           253:                register bool ochng = chng;
        !           254: 
        !           255:                vdoappend("");
        !           256:                if (!ochng)
        !           257:                        sync();
        !           258:                addr1 = addr2 = one;
        !           259:        } else if (addr2 == zero)
        !           260:                addr2 = one;
        !           261: }
        !           262: 
        !           263: /*
        !           264:  * Save lines before visual between unddol and truedol.
        !           265:  * Accomplish this by throwing away current [unddol,truedol]
        !           266:  * and then saving all the lines in the buffer and moving
        !           267:  * unddol back to dol.  Don't do this if in a global.
        !           268:  *
        !           269:  * If you do
        !           270:  *     g/xxx/vi.
        !           271:  * and then do a
        !           272:  *     :e xxxx
        !           273:  * at some point, and then quit from the visual and undo
        !           274:  * you get the old file back.  Somewhat weird.
        !           275:  */
        !           276: savevis()
        !           277: {
        !           278: 
        !           279:        if (inglobal)
        !           280:                return;
        !           281:        truedol = unddol;
        !           282:        saveall();
        !           283:        unddol = dol;
        !           284:        undkind = UNDNONE;
        !           285: }
        !           286: 
        !           287: /*
        !           288:  * Restore a sensible state after a visual/open, moving the saved
        !           289:  * stuff back to [unddol,dol], and killing the partial line kill indicators.
        !           290:  */
        !           291: undvis()
        !           292: {
        !           293: 
        !           294:        if (ruptible)
        !           295:                signal(SIGINT, onintr);
        !           296:        squish();
        !           297:        pkill[0] = pkill[1] = 0;
        !           298:        unddol = truedol;
        !           299:        unddel = zero;
        !           300:        undap1 = one;
        !           301:        undap2 = dol + 1;
        !           302:        undkind = UNDALL;
        !           303:        if (undadot <= zero || undadot > dol)
        !           304:                undadot = zero+1;
        !           305: }
        !           306: 
        !           307: /*
        !           308:  * Set the window parameters based on the base state bastate
        !           309:  * and the available buffer space.
        !           310:  */
        !           311: setwind()
        !           312: {
        !           313: 
        !           314:        WCOLS = COLUMNS;
        !           315:        switch (bastate) {
        !           316: 
        !           317:        case ONEOPEN:
        !           318:                if (AM)
        !           319:                        WCOLS--;
        !           320:                /* fall into ... */
        !           321: 
        !           322:        case HARDOPEN:
        !           323:                basWTOP = WTOP = WBOT = WECHO = 0;
        !           324:                ZERO = 0;
        !           325:                holdcm++;
        !           326:                break;
        !           327: 
        !           328:        case CRTOPEN:
        !           329:                basWTOP = LINES - 2;
        !           330:                /* fall into */
        !           331: 
        !           332:        case VISUAL:
        !           333:                ZERO = LINES - TUBESIZE / WCOLS;
        !           334:                if (ZERO < 0)
        !           335:                        ZERO = 0;
        !           336:                if (ZERO > basWTOP)
        !           337:                        error("Screen too large for internal buffer");
        !           338:                WTOP = basWTOP; WBOT = LINES - 2; WECHO = LINES - 1;
        !           339:                break;
        !           340:        }
        !           341:        state = bastate;
        !           342:        basWLINES = WLINES = WBOT - WTOP + 1;
        !           343: }
        !           344: 
        !           345: /*
        !           346:  * Can we hack an open/visual on this terminal?
        !           347:  * If so, then divide the screen buffer up into lines,
        !           348:  * and initialize a bunch of state variables before we start.
        !           349:  */
        !           350: vok(atube)
        !           351:        register char *atube;
        !           352: {
        !           353:        register int i;
        !           354: 
        !           355:        if (WCOLS == 1000)
        !           356:                serror("Don't know enough about your terminal to use %s", Command);
        !           357:        if (WCOLS > TUBECOLS)
        !           358:                error("Terminal too wide");
        !           359:        if (WLINES >= TUBELINES || WCOLS * (WECHO - ZERO + 1) > TUBESIZE)
        !           360:                error("Screen too large");
        !           361: 
        !           362:        vtube0 = atube;
        !           363:        vclrbyte(atube, WCOLS * (WECHO - ZERO + 1));
        !           364:        for (i = 0; i < ZERO; i++)
        !           365:                vtube[i] = (char *) 0;
        !           366:        for (; i <= WECHO; i++)
        !           367:                vtube[i] = atube, atube += WCOLS;
        !           368:        for (; i < TUBELINES; i++)
        !           369:                vtube[i] = (char *) 0;
        !           370:        vutmp = atube;
        !           371:        vundkind = VNONE;
        !           372:        vUNDdot = 0;
        !           373:        OCOLUMNS = COLUMNS;
        !           374:        inopen = 1;
        !           375: #ifdef CBREAK
        !           376:        signal(SIGINT, vintr);
        !           377: #endif
        !           378:        vmoving = 0;
        !           379:        splitw = 0;
        !           380:        doomed = 0;
        !           381:        holdupd = 0;
        !           382:        Peekkey = 0;
        !           383:        vcnt = vcline = 0;
        !           384:        if (vSCROLL == 0)
        !           385:                vSCROLL = (value(WINDOW)+1)/2;  /* round up so dft=6,11 */
        !           386: }
        !           387: 
        !           388: #ifdef CBREAK
        !           389: vintr()
        !           390: {
        !           391:        extern jmp_buf readbuf;
        !           392:        extern int doingread;
        !           393: 
        !           394:        signal(SIGINT, vintr);
        !           395:        if (vcatch)
        !           396:                onintr();
        !           397:        ungetkey(ATTN);
        !           398:        draino();
        !           399:        if (doingread) {
        !           400:                doingread = 0;
        !           401:                longjmp(readbuf, 1);
        !           402:        }
        !           403: }
        !           404: #endif
        !           405: 
        !           406: /*
        !           407:  * Set the size of the screen to size lines, to take effect the
        !           408:  * next time the screen is redrawn.
        !           409:  */
        !           410: vsetsiz(size)
        !           411:        int size;
        !           412: {
        !           413:        register int b;
        !           414: 
        !           415:        if (bastate != VISUAL)
        !           416:                return;
        !           417:        b = LINES - 1 - size;
        !           418:        if (b >= LINES - 1)
        !           419:                b = LINES - 2;
        !           420:        if (b < 0)
        !           421:                b = 0;
        !           422:        basWTOP = b;
        !           423:        basWLINES = WBOT - b + 1;
        !           424: }
        !           425: 
        !           426: winch()
        !           427: {
        !           428:        vsave();
        !           429:        setty(normf);
        !           430:        longjmp(venv, 1);
        !           431: }

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