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Annotation of 42BSD/ucb/pascal/src/yyget.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)yyget.c 1.5 7/26/83";
        !             4: 
        !             5: #include "whoami.h"
        !             6: #include "0.h"
        !             7: #include "yy.h"
        !             8: 
        !             9: #ifdef PXP
        !            10: int    yytokcnt;
        !            11: #endif
        !            12: 
        !            13: /*
        !            14:  * Readch returns the next
        !            15:  * character from the current
        !            16:  * input line or -1 on end-of-file.
        !            17:  * It also maintains yycol for use in
        !            18:  * printing error messages.
        !            19:  */
        !            20: readch()
        !            21: {
        !            22:        register i, c;
        !            23: 
        !            24:        if (*bufp == '\n' && bufp >= charbuf) {
        !            25: #ifdef PXP
        !            26:                yytokcnt = 0;
        !            27: #endif
        !            28:                if (getline() < 0)
        !            29:                        return (-1);
        !            30:        }
        !            31:        c = *++bufp;
        !            32:        if (c == '\t')
        !            33:                yycol = ((yycol + 8) & ~7);
        !            34:        else
        !            35:                yycol++;
        !            36:        return (c);
        !            37: }
        !            38: 
        !            39: /*
        !            40:  * Definitions of the structures used for the
        !            41:  * include facility.  The variable "ibp" points
        !            42:  * to the getc buffer of the current input file.
        !            43:  * There are "inclev + 1" current include files,
        !            44:  * and information in saved in the incs stack
        !            45:  * whenever a new level of include nesting occurs.
        !            46:  *
        !            47:  * Ibp in the incs structure saves the pointer
        !            48:  * to the previous levels input buffer;
        !            49:  * filename saves the previous file name;
        !            50:  * Printed saves whether the previous file name
        !            51:  * had been printed before this nesting occurred;
        !            52:  * and yyline is the line we were on on the previous file.
        !            53:  */
        !            54: 
        !            55: #define        MAXINC  10
        !            56: 
        !            57: struct inc {
        !            58:        FILE    *ibp;
        !            59:        char    *filename;
        !            60:        int     Printed;
        !            61:        int     yyline;
        !            62:        int     yyLinpt;
        !            63: } incs[MAXINC];
        !            64: 
        !            65: extern char printed;
        !            66: 
        !            67: int    inclev  = -1;
        !            68: 
        !            69: #ifdef PXP
        !            70: /*
        !            71:  * These initializations survive only if
        !            72:  * pxp is asked to pretty print one file.
        !            73:  * Otherwise they are destroyed by the initial
        !            74:  * call to getline.
        !            75:  */
        !            76: char   charbuf[CBSIZE] = " program x(output);\n";
        !            77: int    yycol = 8;
        !            78: char   *bufp = charbuf;
        !            79: 
        !            80: #endif
        !            81: /*
        !            82:  * YyLinpt is the seek pointer to the beginning of the
        !            83:  * next line in the file.
        !            84:  */
        !            85: int    yyLinpt;
        !            86: 
        !            87: /*
        !            88:  * Getline places the next line
        !            89:  * from the input stream in the
        !            90:  * line buffer, returning -1 at YEOF.
        !            91:  */
        !            92: getline()
        !            93: {
        !            94:        register char *cp;
        !            95:        register CHAR c;
        !            96: #ifdef PXP
        !            97:        static char ateof;
        !            98: #endif
        !            99:        register FILE *ib;
        !           100:        int i;
        !           101: 
        !           102:        if (opt('l') && yyprtd == 0)
        !           103:                yyoutline();
        !           104:        yyprtd = 0;
        !           105: top:
        !           106:        yylinpt = yyLinpt;
        !           107:        yyline++;
        !           108:        yyseqid++;
        !           109:        cp = charbuf;
        !           110:        ib = ibp;
        !           111:        i = sizeof charbuf - 1;
        !           112:        for (;;) {
        !           113:                c = getc(ib);
        !           114:                if (c == EOF) {
        !           115:                        if (uninclud())
        !           116:                                goto top;
        !           117: #ifdef PXP
        !           118:                        if (ateof == 0 && bracket) {
        !           119:                                strcpy(charbuf, "begin end.\n");
        !           120:                                ateof = 1;
        !           121:                                goto out;
        !           122:                        }
        !           123: #endif
        !           124:                        bufp = "\n";
        !           125:                        yyline--;
        !           126:                        yyseqid--;
        !           127:                        yyprtd = 1;
        !           128:                        return (-1);
        !           129:                }
        !           130:                *cp++ = c;
        !           131:                if (c == '\n')
        !           132:                        break;
        !           133:                if (--i == 0) {
        !           134:                        line = yyline;
        !           135:                        error("Input line too long - QUIT");
        !           136:                        pexit(DIED);
        !           137:                }
        !           138:        }
        !           139:        *cp = 0;
        !           140:        yyLinpt = yylinpt + cp - charbuf;
        !           141:        if (includ())
        !           142:                goto top;
        !           143: #ifdef PXP
        !           144:        if (cp == &charbuf[1])
        !           145:                commnl();
        !           146:        else if (cp == &charbuf[2])
        !           147:                switch (charbuf[0]) {
        !           148:                        case ' ':
        !           149:                                commnlbl();
        !           150:                                break;
        !           151:                        case '\f':
        !           152:                                commform();
        !           153:                }
        !           154: #endif
        !           155:        if (opt('u'))
        !           156:                setuflg();
        !           157: out:
        !           158:        bufp = charbuf - 1;
        !           159:        yycol = 8;
        !           160:        return (1);
        !           161: }
        !           162: 
        !           163: /*
        !           164:  * Check an input line to see if it is a "#include" pseudo-statement.
        !           165:  * We allow arbitrary blanks in the line and the file name
        !           166:  * may be delimited by either 's or "s.  A single semicolon
        !           167:  * may be placed after the name, but nothing else is allowed
        !           168:  */
        !           169: includ()
        !           170: {
        !           171:        register char *cp, *dp;
        !           172:        char ch;
        !           173:        register struct inc *ip;
        !           174: 
        !           175:        cp = charbuf;
        !           176:        if (*cp++ != '#')
        !           177:                return (0);
        !           178:        cp = skipbl(cp);
        !           179:        for (dp = "include"; *dp; dp++)
        !           180:                if (*dp != *cp++)
        !           181:                        return (0);
        !           182:        line = yyline;
        !           183:        cp = skipbl(cp);
        !           184:        ch = *cp++;
        !           185:        if (ch != '\'' && ch != '"') {
        !           186:                /*
        !           187:                 * This should be a yerror flagging the place
        !           188:                 * but its not worth figuring out the column.
        !           189:                 */
        !           190:                line = yyline;
        !           191:                error("Include syntax error - expected ' or \" not found - QUIT");
        !           192:                pexit(DIED);
        !           193:        }
        !           194:        for (dp = cp; *dp != ch; dp++)
        !           195:                if (*dp == 0) {
        !           196:                        line = yyline;
        !           197:                        error("Missing closing %c for include file name - QUIT", ch);
        !           198:                        pexit(DIED);
        !           199:                }
        !           200:        *dp++ = 0;
        !           201: /*
        !           202:  *     if (*dp == ';')
        !           203:  *             dp++;
        !           204:  *     dp = skipbl(dp);
        !           205:  *     if (*dp != '\n') {
        !           206:  *             line = yyline;
        !           207:  *             error("Garbage after filename in include");
        !           208:  *             pexit(DIED);
        !           209:  *     }
        !           210:  */
        !           211:        if (!dotted(cp, 'i') && !dotted(cp, 'h')) {
        !           212:                line = yyline;
        !           213:                error("Include filename must end in .i or .h");
        !           214:        }
        !           215: #ifdef PXP
        !           216:        commincl(cp, ch);
        !           217:        if (noinclude)
        !           218:                return (1);
        !           219: #endif
        !           220:        inclev++;
        !           221:        if (inclev > MAXINC) {
        !           222:                line = yyline;
        !           223:                error("Absurdly deep include nesting - QUIT");
        !           224:                pexit(DIED);
        !           225:        }
        !           226:        ip = &incs[inclev];
        !           227:        ip->filename = filename;
        !           228:        filename = savestr(cp);
        !           229: 
        !           230: #ifdef OBJ
        !           231: /*
        !           232:  * For the debugger pdx, we need to note that we've changed files.
        !           233:  */
        !           234:        newfile(filename, 1);
        !           235: #endif
        !           236: 
        !           237: /*
        !           238:  *     left over from before stdio
        !           239:  *
        !           240:  *     cp = malloc(518);
        !           241:  *     if (cp == -1) {
        !           242:  *             error("Ran out of memory (include)");
        !           243:  *             pexit(DIED);
        !           244:  *     }
        !           245:  *
        !           246:  */
        !           247:        ip->ibp = ibp;
        !           248:        if ( ( ibp = fopen(filename, "r" ) ) == NULL ) {
        !           249:                perror(filename);
        !           250:                pexit(DIED);
        !           251:        }
        !           252:        if (inpflist(filename)) {
        !           253: #ifdef PI
        !           254:                opush('l');
        !           255: #endif
        !           256: #ifdef PXP
        !           257:                opush('z');
        !           258: #endif
        !           259:        }
        !           260:        ip->Printed = printed;
        !           261:        printed = 0;
        !           262:        ip->yyline = yyline;
        !           263:        yyline = 0;
        !           264:        ip->yyLinpt = yyLinpt;
        !           265:        yyLinpt = 0;
        !           266: /*
        !           267:  *     left over from before stdio
        !           268:  *
        !           269:  *     ip->ibp = ibp;
        !           270:  *     ibp = cp;
        !           271:  *
        !           272:  */
        !           273: #      ifdef PC
        !           274:            stabinclude( filename , TRUE );
        !           275: #      endif PC
        !           276:        return (1);
        !           277: }
        !           278: 
        !           279: skipbl(ocp)
        !           280:        char *ocp;
        !           281: {
        !           282:        register char *cp;
        !           283: 
        !           284:        cp = ocp;
        !           285:        while (*cp == ' ' || *cp == '\t')
        !           286:                cp++;
        !           287:        return (cp);
        !           288: }
        !           289: 
        !           290: 
        !           291: /*
        !           292:  * At the end of an include,
        !           293:  * close the file, free the input buffer,
        !           294:  * and restore the environment before
        !           295:  * the "push", including the value of
        !           296:  * the z option for pxp and the l option for pi.
        !           297:  */
        !           298: uninclud()
        !           299: {
        !           300:        register struct inc *ip;
        !           301: 
        !           302:        if (inclev < 0)
        !           303:                return (0);
        !           304: /*
        !           305:  *     left over from before stdio: becomes fclose ( ibp )
        !           306:  *
        !           307:  *     close(ibp[0]);
        !           308:  *     free(ibp);
        !           309:  *
        !           310:  */
        !           311:        fclose ( ibp );
        !           312:        ip = &incs[inclev];
        !           313:        ibp = ip->ibp;
        !           314:        yyline = ip->yyline;
        !           315:        if (inpflist(filename)) {
        !           316: #ifdef PI
        !           317:                opop('l');
        !           318: #endif
        !           319: #ifdef PXP
        !           320:                opop('z');
        !           321: #endif
        !           322:        }
        !           323:        filename = ip->filename;
        !           324: 
        !           325:        yyLinpt = ip->yyLinpt;
        !           326:        /*
        !           327:         * If we printed out the nested name,
        !           328:         * then we should print all covered names again.
        !           329:         * If we didn't print out the nested name
        !           330:         * we print the uncovered name only if it
        !           331:         * has not been printed before (unstack).
        !           332:         */
        !           333:        if (printed) {
        !           334:                printed = 0;
        !           335:                while (ip >= incs) {
        !           336:                        ip->Printed = 0;
        !           337:                        ip--;
        !           338:                }
        !           339:        } else
        !           340:                printed = ip->Printed;
        !           341: #      ifdef OBJ
        !           342:        /*
        !           343:         * For the debugger pdx, we need to note that we've changed files.
        !           344:         */
        !           345:        newfile(filename, yyline);
        !           346: #endif
        !           347: #      ifdef PC
        !           348:            if ( inclev == 0 ) {
        !           349:                stabsource( filename );
        !           350:            } else {
        !           351:                stabinclude( filename , FALSE );
        !           352:            }
        !           353: #      endif PC
        !           354:        inclev--;
        !           355:        return (1);
        !           356: }

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