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Annotation of 40BSD/cmd/ex/ex_v.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1980 Regents of the University of California */
        !             2: static char *sccsid = "@(#)ex_v.c      6.1 10/18/80";
        !             3: #include "ex.h"
        !             4: #include "ex_re.h"
        !             5: #include "ex_tty.h"
        !             6: #include "ex_vis.h"
        !             7: 
        !             8: /*
        !             9:  * Entry points to open and visual from command mode processor.
        !            10:  * The open/visual code breaks down roughly as follows:
        !            11:  *
        !            12:  * ex_v.c      entry points, checking of terminal characteristics
        !            13:  *
        !            14:  * ex_vadj.c   logical screen control, use of intelligent operations
        !            15:  *             insert/delete line and coordination with screen image;
        !            16:  *             updating of screen after changes.
        !            17:  *
        !            18:  * ex_vget.c   input of single keys and reading of input lines
        !            19:  *             from the echo area, handling of \ escapes on input for
        !            20:  *             uppercase only terminals, handling of memory for repeated
        !            21:  *             commands and small saved texts from inserts and partline
        !            22:  *             deletes, notification of multi line changes in the echo
        !            23:  *             area.
        !            24:  *
        !            25:  * ex_vmain.c  main command decoding, some command processing.
        !            26:  *
        !            27:  * ex_voperate.c   decoding of operator/operand sequences and
        !            28:  *             contextual scans, implementation of word motions.
        !            29:  *
        !            30:  * ex_vops.c   major operator interfaces, undos, motions, deletes,
        !            31:  *             changes, opening new lines, shifts, replacements and yanks
        !            32:  *             coordinating logical and physical changes.
        !            33:  *
        !            34:  * ex_vops2.c  subroutines for operator interfaces in ex_vops.c,
        !            35:  *             insert mode, read input line processing at lowest level.
        !            36:  *
        !            37:  * ex_vops3.c  structured motion definitions of ( ) { } and [ ] operators,
        !            38:  *             indent for lisp routines, () and {} balancing. 
        !            39:  *
        !            40:  * ex_vput.c   output routines, clearing, physical mapping of logical cursor
        !            41:  *             positioning, cursor motions, handling of insert character
        !            42:  *             and delete character functions of intelligent and unintelligent
        !            43:  *             terminals, visual mode tracing routines (for debugging),
        !            44:  *             control of screen image and its updating.
        !            45:  *
        !            46:  * ex_vwind.c  window level control of display, forward and backward rolls,
        !            47:  *             absolute motions, contextual displays, line depth determination
        !            48:  */
        !            49: 
        !            50: /*
        !            51:  * Enter open mode
        !            52:  */
        !            53: oop()
        !            54: {
        !            55:        register char *ic;
        !            56:        char atube[TUBESIZE + LBSIZE];
        !            57:        register ttymode f;
        !            58: 
        !            59:        ovbeg();
        !            60:        if (peekchar() == '/') {
        !            61:                ignore(compile(getchar(), 1));
        !            62:                savere(scanre);
        !            63:                if (execute(0, dot) == 0)
        !            64:                        error("Fail|Pattern not found on addressed line");
        !            65:                ic = loc1;
        !            66:                if (ic > linebuf && *ic == 0)
        !            67:                        ic--;
        !            68:        } else {
        !            69:                getDOT();
        !            70:                ic = vskipwh(linebuf);
        !            71:        }
        !            72:        newline();
        !            73: 
        !            74:        /*
        !            75:         * If overstrike then have to HARDOPEN
        !            76:         * else if can move cursor up off current line can use CRTOPEN (~~vi1)
        !            77:         * otherwise (ugh) have to use ONEOPEN (like adm3)
        !            78:         */
        !            79:        if (OS && !EO)
        !            80:                bastate = HARDOPEN;
        !            81:        else if (CA || UP)
        !            82:                bastate = CRTOPEN;
        !            83:        else
        !            84:                bastate = ONEOPEN;
        !            85:        setwind();
        !            86: 
        !            87:        /*
        !            88:         * To avoid bombing on glass-crt's when the line is too long
        !            89:         * pretend that such terminals are 160 columns wide.
        !            90:         * If a line is too wide for display, we will dynamically
        !            91:         * switch to hardcopy open mode.
        !            92:         */
        !            93:        if (state != CRTOPEN)
        !            94:                WCOLS = TUBECOLS;
        !            95:        if (!inglobal)
        !            96:                savevis();
        !            97:        vok(atube);
        !            98:        if (state != CRTOPEN)
        !            99:                COLUMNS = WCOLS;
        !           100:        Outchar = vputchar;
        !           101:        f = ostart();
        !           102:        if (state == CRTOPEN) {
        !           103:                if (outcol == UKCOL)
        !           104:                        outcol = 0;
        !           105:                vmoveitup(1, 1);
        !           106:        } else
        !           107:                outline = destline = WBOT;
        !           108:        vshow(dot, NOLINE);
        !           109:        vnline(ic);
        !           110:        vmain();
        !           111:        if (state != CRTOPEN)
        !           112:                vclean();
        !           113:        Command = "open";
        !           114:        ovend(f);
        !           115: }
        !           116: 
        !           117: ovbeg()
        !           118: {
        !           119: 
        !           120:        if (!value(OPEN))
        !           121:                error("Can't use open/visual unless open option is set");
        !           122:        if (inopen)
        !           123:                error("Recursive open/visual not allowed");
        !           124:        Vlines = lineDOL();
        !           125:        fixzero();
        !           126:        setdot();
        !           127:        pastwh();
        !           128:        dot = addr2;
        !           129: }
        !           130: 
        !           131: ovend(f)
        !           132:        ttymode f;
        !           133: {
        !           134: 
        !           135:        splitw++;
        !           136:        vgoto(WECHO, 0);
        !           137:        vclreol();
        !           138:        vgoto(WECHO, 0);
        !           139:        holdcm = 0;
        !           140:        splitw = 0;
        !           141:        ostop(f);
        !           142:        setoutt();
        !           143:        undvis();
        !           144:        COLUMNS = OCOLUMNS;
        !           145:        inopen = 0;
        !           146:        flusho();
        !           147:        netchHAD(Vlines);
        !           148: }
        !           149: 
        !           150: /*
        !           151:  * Enter visual mode
        !           152:  */
        !           153: vop()
        !           154: {
        !           155:        register int c;
        !           156:        char atube[TUBESIZE + LBSIZE];
        !           157:        register ttymode f;
        !           158: 
        !           159:        if (!CA && UP == NOSTR) {
        !           160:                if (initev) {
        !           161: toopen:
        !           162:                        merror("[Using open mode]");
        !           163:                        putNFL();
        !           164:                        oop();
        !           165:                        return;
        !           166:                }
        !           167:                error("Visual needs addressible cursor or upline capability");
        !           168:        }
        !           169:        if (OS && !EO) {
        !           170:                if (initev)
        !           171:                        goto toopen;
        !           172:                error("Can't use visual on a terminal which overstrikes");
        !           173:        }
        !           174:        if (!CL) {
        !           175:                if (initev)
        !           176:                        goto toopen;
        !           177:                error("Visual requires clear screen capability");
        !           178:        }
        !           179:        if (NS && !SF) {
        !           180:                if (initev)
        !           181:                        goto toopen;
        !           182:                error("Visual requires scrolling");
        !           183:        }
        !           184:        ovbeg();
        !           185:        bastate = VISUAL;
        !           186:        c = 0;
        !           187:        if (any(peekchar(), "+-^."))
        !           188:                c = getchar();
        !           189:        pastwh();
        !           190:        vsetsiz(isdigit(peekchar()) ? getnum() : value(WINDOW));
        !           191:        setwind();
        !           192:        newline();
        !           193:        vok(atube);
        !           194:        if (!inglobal)
        !           195:                savevis();
        !           196:        Outchar = vputchar;
        !           197:        vmoving = 0;
        !           198:        f = ostart();
        !           199:        if (initev == 0) {
        !           200:                vcontext(dot, c);
        !           201:                vnline(NOSTR);
        !           202:        }
        !           203:        vmain();
        !           204:        Command = "visual";
        !           205:        ovend(f);
        !           206: }
        !           207: 
        !           208: /*
        !           209:  * Hack to allow entry to visual with
        !           210:  * empty buffer since routines internally
        !           211:  * demand at least one line.
        !           212:  */
        !           213: fixzero()
        !           214: {
        !           215: 
        !           216:        if (dol == zero) {
        !           217:                register bool ochng = chng;
        !           218: 
        !           219:                vdoappend("");
        !           220:                if (!ochng)
        !           221:                        sync();
        !           222:                addr1 = addr2 = one;
        !           223:        } else if (addr2 == zero)
        !           224:                addr2 = one;
        !           225: }
        !           226: 
        !           227: /*
        !           228:  * Save lines before visual between unddol and truedol.
        !           229:  * Accomplish this by throwing away current [unddol,truedol]
        !           230:  * and then saving all the lines in the buffer and moving
        !           231:  * unddol back to dol.  Don't do this if in a global.
        !           232:  *
        !           233:  * If you do
        !           234:  *     g/xxx/vi.
        !           235:  * and then do a
        !           236:  *     :e xxxx
        !           237:  * at some point, and then quit from the visual and undo
        !           238:  * you get the old file back.  Somewhat weird.
        !           239:  */
        !           240: savevis()
        !           241: {
        !           242: 
        !           243:        if (inglobal)
        !           244:                return;
        !           245:        truedol = unddol;
        !           246:        saveall();
        !           247:        unddol = dol;
        !           248:        undkind = UNDNONE;
        !           249: }
        !           250: 
        !           251: /*
        !           252:  * Restore a sensible state after a visual/open, moving the saved
        !           253:  * stuff back to [unddol,dol], and killing the partial line kill indicators.
        !           254:  */
        !           255: undvis()
        !           256: {
        !           257: 
        !           258:        if (ruptible)
        !           259:                signal(SIGINT, onintr);
        !           260:        squish();
        !           261:        pkill[0] = pkill[1] = 0;
        !           262:        unddol = truedol;
        !           263:        unddel = zero;
        !           264:        undap1 = one;
        !           265:        undap2 = dol + 1;
        !           266:        undkind = UNDALL;
        !           267:        if (undadot <= zero || undadot > dol)
        !           268:                undadot = zero+1;
        !           269: }
        !           270: 
        !           271: /*
        !           272:  * Set the window parameters based on the base state bastate
        !           273:  * and the available buffer space.
        !           274:  */
        !           275: setwind()
        !           276: {
        !           277: 
        !           278:        WCOLS = COLUMNS;
        !           279:        switch (bastate) {
        !           280: 
        !           281:        case ONEOPEN:
        !           282:                if (AM)
        !           283:                        WCOLS--;
        !           284:                /* fall into ... */
        !           285: 
        !           286:        case HARDOPEN:
        !           287:                basWTOP = WTOP = WBOT = WECHO = 0;
        !           288:                ZERO = 0;
        !           289:                holdcm++;
        !           290:                break;
        !           291: 
        !           292:        case CRTOPEN:
        !           293:                basWTOP = LINES - 2;
        !           294:                /* fall into */
        !           295: 
        !           296:        case VISUAL:
        !           297:                ZERO = LINES - TUBESIZE / WCOLS;
        !           298:                if (ZERO < 0)
        !           299:                        ZERO = 0;
        !           300:                if (ZERO > basWTOP)
        !           301:                        error("Screen too large for internal buffer");
        !           302:                WTOP = basWTOP; WBOT = LINES - 2; WECHO = LINES - 1;
        !           303:                break;
        !           304:        }
        !           305:        state = bastate;
        !           306:        basWLINES = WLINES = WBOT - WTOP + 1;
        !           307: }
        !           308: 
        !           309: /*
        !           310:  * Can we hack an open/visual on this terminal?
        !           311:  * If so, then divide the screen buffer up into lines,
        !           312:  * and initialize a bunch of state variables before we start.
        !           313:  */
        !           314: vok(atube)
        !           315:        register char *atube;
        !           316: {
        !           317:        register int i;
        !           318: 
        !           319:        if (WCOLS == 1000)
        !           320:                serror("Don't know enough about your terminal to use %s", Command);
        !           321:        if (WCOLS > TUBECOLS)
        !           322:                error("Terminal too wide");
        !           323:        if (WLINES >= TUBELINES || WCOLS * (WECHO - ZERO + 1) > TUBESIZE)
        !           324:                error("Screen too large");
        !           325: 
        !           326:        vtube0 = atube;
        !           327:        vclrbyte(atube, WCOLS * (WECHO - ZERO + 1));
        !           328:        for (i = 0; i < ZERO; i++)
        !           329:                vtube[i] = (char *) 0;
        !           330:        for (; i <= WECHO; i++)
        !           331:                vtube[i] = atube, atube += WCOLS;
        !           332:        for (; i < TUBELINES; i++)
        !           333:                vtube[i] = (char *) 0;
        !           334:        vutmp = atube;
        !           335:        vundkind = VNONE;
        !           336:        vUNDdot = 0;
        !           337:        OCOLUMNS = COLUMNS;
        !           338:        inopen = 1;
        !           339: #ifdef CBREAK
        !           340:        signal(SIGINT, vintr);
        !           341: #endif
        !           342:        vmoving = 0;
        !           343:        splitw = 0;
        !           344:        doomed = 0;
        !           345:        holdupd = 0;
        !           346:        Peekkey = 0;
        !           347:        vcnt = vcline = 0;
        !           348:        if (vSCROLL == 0)
        !           349:                vSCROLL = (value(WINDOW)+1)/2;  /* round up so dft=6,11 */
        !           350: }
        !           351: 
        !           352: #ifdef CBREAK
        !           353: vintr()
        !           354: {
        !           355: 
        !           356:        signal(SIGINT, vintr);
        !           357:        if (vcatch)
        !           358:                onintr();
        !           359:        ungetkey(ATTN);
        !           360:        draino();
        !           361: }
        !           362: #endif
        !           363: 
        !           364: /*
        !           365:  * Set the size of the screen to size lines, to take effect the
        !           366:  * next time the screen is redrawn.
        !           367:  */
        !           368: vsetsiz(size)
        !           369:        int size;
        !           370: {
        !           371:        register int b;
        !           372: 
        !           373:        if (bastate != VISUAL)
        !           374:                return;
        !           375:        b = LINES - 1 - size;
        !           376:        if (b >= LINES - 1)
        !           377:                b = LINES - 2;
        !           378:        if (b < 0)
        !           379:                b = 0;
        !           380:        basWTOP = b;
        !           381:        basWLINES = WBOT - b + 1;
        !           382: }

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