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Annotation of 43BSD/ucb/pascal/src/yyget.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[] = "@(#)yyget.c    5.1 (Berkeley) 6/5/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "whoami.h"
        !            12: #include "0.h"
        !            13: #include "tree_ty.h"   /* must be included for yy.h */
        !            14: #include "yy.h"
        !            15: 
        !            16: #ifdef PXP
        !            17: int    yytokcnt;
        !            18: #endif
        !            19: 
        !            20: /*
        !            21:  * Readch returns the next
        !            22:  * character from the current
        !            23:  * input line or -1 on end-of-file.
        !            24:  * It also maintains yycol for use in
        !            25:  * printing error messages.
        !            26:  */
        !            27: readch()
        !            28: {
        !            29:        register c;
        !            30: 
        !            31:        if (*bufp == '\n' && bufp >= charbuf) {
        !            32: #ifdef PXP
        !            33:                yytokcnt = 0;
        !            34: #endif
        !            35:                if (getline() < 0)
        !            36:                        return (-1);
        !            37:        }
        !            38:        c = *++bufp;
        !            39:        if (c == '\t')
        !            40:                yycol = ((yycol + 8) & ~7);
        !            41:        else
        !            42:                yycol++;
        !            43:        return (c);
        !            44: }
        !            45: 
        !            46: /*
        !            47:  * Definitions of the structures used for the
        !            48:  * include facility.  The variable "ibp" points
        !            49:  * to the getc buffer of the current input file.
        !            50:  * There are "inclev + 1" current include files,
        !            51:  * and information in saved in the incs stack
        !            52:  * whenever a new level of include nesting occurs.
        !            53:  *
        !            54:  * Ibp in the incs structure saves the pointer
        !            55:  * to the previous levels input buffer;
        !            56:  * filename saves the previous file name;
        !            57:  * Printed saves whether the previous file name
        !            58:  * had been printed before this nesting occurred;
        !            59:  * and yyline is the line we were on on the previous file.
        !            60:  */
        !            61: 
        !            62: #define        MAXINC  10
        !            63: 
        !            64: struct inc {
        !            65:        FILE    *ibp;
        !            66:        char    *filename;
        !            67:        int     Printed;
        !            68:        int     yyline;
        !            69:        int     yyLinpt;
        !            70: } incs[MAXINC];
        !            71: 
        !            72: extern char printed;
        !            73: 
        !            74: int    inclev  = -1;
        !            75: 
        !            76: #ifdef PXP
        !            77: /*
        !            78:  * These initializations survive only if
        !            79:  * pxp is asked to pretty print one file.
        !            80:  * Otherwise they are destroyed by the initial
        !            81:  * call to getline.
        !            82:  */
        !            83: char   charbuf[CBSIZE] = " program x(output);\n";
        !            84: int    yycol = 8;
        !            85: char   *bufp = charbuf;
        !            86: 
        !            87: #endif
        !            88: /*
        !            89:  * YyLinpt is the seek pointer to the beginning of the
        !            90:  * next line in the file.
        !            91:  */
        !            92: int    yyLinpt;
        !            93: 
        !            94: /*
        !            95:  * Getline places the next line
        !            96:  * from the input stream in the
        !            97:  * line buffer, returning -1 at YEOF.
        !            98:  */
        !            99: getline()
        !           100: {
        !           101:        register char *cp;
        !           102:        register CHAR c;
        !           103: #ifdef PXP
        !           104:        static char ateof;
        !           105: #endif
        !           106:        register FILE *ib;
        !           107:        int i;
        !           108: 
        !           109:        if (opt('l') && yyprtd == 0)
        !           110:                yyoutline();
        !           111:        yyprtd = 0;
        !           112: top:
        !           113:        yylinpt = yyLinpt;
        !           114:        yyline++;
        !           115:        yyseqid++;
        !           116:        cp = charbuf;
        !           117:        ib = ibp;
        !           118:        i = sizeof charbuf - 1;
        !           119:        for (;;) {
        !           120:                c = getc(ib);
        !           121:                if (c == EOF) {
        !           122:                        if (uninclud())
        !           123:                                goto top;
        !           124: #ifdef PXP
        !           125:                        if (ateof == 0 && bracket) {
        !           126:                                (void) pstrcpy(charbuf, "begin end.\n");
        !           127:                                ateof = 1;
        !           128:                                goto out;
        !           129:                        }
        !           130: #endif
        !           131:                        bufp = "\n";
        !           132:                        yyline--;
        !           133:                        yyseqid--;
        !           134:                        yyprtd = 1;
        !           135:                        return (-1);
        !           136:                }
        !           137:                *cp++ = c;
        !           138:                if (c == '\n')
        !           139:                        break;
        !           140:                if (--i == 0) {
        !           141:                        line = yyline;
        !           142:                        error("Input line too long - QUIT");
        !           143:                        pexit(DIED);
        !           144:                }
        !           145:        }
        !           146:        *cp = 0;
        !           147:        yyLinpt = yylinpt + cp - charbuf;
        !           148:        if (includ())
        !           149:                goto top;
        !           150: #ifdef PXP
        !           151:        if (cp == &charbuf[1])
        !           152:                commnl();
        !           153:        else if (cp == &charbuf[2])
        !           154:                switch (charbuf[0]) {
        !           155:                        case ' ':
        !           156:                                commnlbl();
        !           157:                                break;
        !           158:                        case '\f':
        !           159:                                commform();
        !           160:                }
        !           161: #endif
        !           162:        if (opt('u'))
        !           163:                setuflg();
        !           164: #ifdef PXP
        !           165: out:
        !           166: #endif
        !           167:        bufp = charbuf - 1;
        !           168:        yycol = 8;
        !           169:        return (1);
        !           170: }
        !           171: 
        !           172: /*
        !           173:  * Check an input line to see if it is a "#include" pseudo-statement.
        !           174:  * We allow arbitrary blanks in the line and the file name
        !           175:  * may be delimited by either 's or "s.  A single semicolon
        !           176:  * may be placed after the name, but nothing else is allowed
        !           177:  */
        !           178: includ()
        !           179: {
        !           180:        register char *cp, *dp;
        !           181:        char ch;
        !           182:        register struct inc *ip;
        !           183: 
        !           184:        cp = charbuf;
        !           185:        if (*cp++ != '#')
        !           186:                return (0);
        !           187:        cp = skipbl(cp);
        !           188:        for (dp = "include"; *dp; dp++)
        !           189:                if (*dp != *cp++)
        !           190:                        return (0);
        !           191:        line = yyline;
        !           192:        cp = skipbl(cp);
        !           193:        ch = *cp++;
        !           194:        if (ch != '\'' && ch != '"') {
        !           195:                /*
        !           196:                 * This should be a yerror flagging the place
        !           197:                 * but its not worth figuring out the column.
        !           198:                 */
        !           199:                line = yyline;
        !           200:                error("Include syntax error - expected ' or \" not found - QUIT");
        !           201:                pexit(DIED);
        !           202:        }
        !           203:        for (dp = cp; *dp != ch; dp++)
        !           204:                if (*dp == 0) {
        !           205:                        line = yyline;
        !           206:                        error("Missing closing %c for include file name - QUIT", (char *) ch);
        !           207:                        pexit(DIED);
        !           208:                }
        !           209:        *dp++ = 0;
        !           210: /*
        !           211:  *     if (*dp == ';')
        !           212:  *             dp++;
        !           213:  *     dp = skipbl(dp);
        !           214:  *     if (*dp != '\n') {
        !           215:  *             line = yyline;
        !           216:  *             error("Garbage after filename in include");
        !           217:  *             pexit(DIED);
        !           218:  *     }
        !           219:  */
        !           220:        if (!dotted(cp, 'i') && !dotted(cp, 'h')) {
        !           221:                line = yyline;
        !           222:                error("Include filename must end in .i or .h");
        !           223:        }
        !           224: #ifdef PXP
        !           225:        commincl(cp, ch);
        !           226:        if (noinclude)
        !           227:                return (1);
        !           228: #endif
        !           229:        inclev++;
        !           230:        if (inclev > MAXINC) {
        !           231:                line = yyline;
        !           232:                error("Absurdly deep include nesting - QUIT");
        !           233:                pexit(DIED);
        !           234:        }
        !           235:        ip = &incs[inclev];
        !           236:        ip->filename = filename;
        !           237:        filename = savestr(cp);
        !           238: 
        !           239: #ifdef OBJ
        !           240: /*
        !           241:  * For the debugger pdx, we need to note that we've changed files.
        !           242:  */
        !           243:        newfile(filename, 1);
        !           244: #endif
        !           245: 
        !           246: /*
        !           247:  *     left over from before stdio
        !           248:  *
        !           249:  *     cp = malloc(518);
        !           250:  *     if (cp == -1) {
        !           251:  *             error("Ran out of memory (include)");
        !           252:  *             pexit(DIED);
        !           253:  *     }
        !           254:  *
        !           255:  */
        !           256:        ip->ibp = ibp;
        !           257:        if ( ( ibp = fopen(filename, "r" ) ) == NULL ) {
        !           258:                perror(filename);
        !           259:                pexit(DIED);
        !           260:        }
        !           261:        if (inpflist(filename)) {
        !           262: #ifdef PI
        !           263:                opush('l');
        !           264: #endif
        !           265: #ifdef PXP
        !           266:                opush('z');
        !           267: #endif
        !           268:        }
        !           269:        ip->Printed = printed;
        !           270:        printed = 0;
        !           271:        ip->yyline = yyline;
        !           272:        yyline = 0;
        !           273:        ip->yyLinpt = yyLinpt;
        !           274:        yyLinpt = 0;
        !           275: /*
        !           276:  *     left over from before stdio
        !           277:  *
        !           278:  *     ip->ibp = ibp;
        !           279:  *     ibp = cp;
        !           280:  *
        !           281:  */
        !           282: #      ifdef PC
        !           283:            stabinclude( filename , TRUE );
        !           284: #      endif PC
        !           285:        return (1);
        !           286: }
        !           287: 
        !           288: char *
        !           289: skipbl(ocp)
        !           290:        char *ocp;
        !           291: {
        !           292:        register char *cp;
        !           293: 
        !           294:        cp = ocp;
        !           295:        while (*cp == ' ' || *cp == '\t')
        !           296:                cp++;
        !           297:        return (cp);
        !           298: }
        !           299: 
        !           300: 
        !           301: /*
        !           302:  * At the end of an include,
        !           303:  * close the file, free the input buffer,
        !           304:  * and restore the environment before
        !           305:  * the "push", including the value of
        !           306:  * the z option for pxp and the l option for pi.
        !           307:  */
        !           308: uninclud()
        !           309: {
        !           310:        register struct inc *ip;
        !           311: 
        !           312:        if (inclev < 0)
        !           313:                return (0);
        !           314: /*
        !           315:  *     left over from before stdio: becomes fclose ( ibp )
        !           316:  *
        !           317:  *     (void) close(ibp[0]);
        !           318:  *     free(ibp);
        !           319:  *
        !           320:  */
        !           321:        (void) fclose ( ibp );
        !           322:        ip = &incs[inclev];
        !           323:        ibp = ip->ibp;
        !           324:        yyline = ip->yyline;
        !           325:        if (inpflist(filename)) {
        !           326: #ifdef PI
        !           327:                opop('l');
        !           328: #endif
        !           329: #ifdef PXP
        !           330:                opop('z');
        !           331: #endif
        !           332:        }
        !           333:        filename = ip->filename;
        !           334: 
        !           335:        yyLinpt = ip->yyLinpt;
        !           336:        /*
        !           337:         * If we printed out the nested name,
        !           338:         * then we should print all covered names again.
        !           339:         * If we didn't print out the nested name
        !           340:         * we print the uncovered name only if it
        !           341:         * has not been printed before (unstack).
        !           342:         */
        !           343:        if (printed) {
        !           344:                printed = 0;
        !           345:                while (ip >= incs) {
        !           346:                        ip->Printed = 0;
        !           347:                        ip--;
        !           348:                }
        !           349:        } else
        !           350:                printed = ip->Printed;
        !           351: #      ifdef OBJ
        !           352:        /*
        !           353:         * For the debugger pdx, we need to note that we've changed files.
        !           354:         */
        !           355:        newfile(filename, yyline);
        !           356: #endif
        !           357: #      ifdef PC
        !           358:            if ( inclev == 0 ) {
        !           359:                stabsource( filename );
        !           360:            } else {
        !           361:                stabinclude( filename , FALSE );
        !           362:            }
        !           363: #      endif PC
        !           364:        inclev--;
        !           365:        return (1);
        !           366: }

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