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Annotation of 41BSD/cmd/pxp/yyput.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: #
        !             3: /*
        !             4:  * pi - Pascal interpreter code translator
        !             5:  *
        !             6:  * Charles Haley, Bill Joy UCB
        !             7:  * Version 1.2 January 1979
        !             8:  *
        !             9:  *
        !            10:  * pxp - Pascal execution profiler
        !            11:  *
        !            12:  * Bill Joy UCB
        !            13:  * Version 1.2 January 1979
        !            14:  */
        !            15: 
        !            16: #include "0.h"
        !            17: #include "tree.h"
        !            18: #include "yy.h"
        !            19: 
        !            20: /*
        !            21:  * Structure describing queued listing lines during the forward move
        !            22:  * of error recovery.  These lines will be stroed by yyoutline during
        !            23:  * the forward move and flushed by yyoutfl or yyflush when an
        !            24:  * error occurs or a program termination.
        !            25:  */
        !            26: struct B {
        !            27:        int     Bmagic;
        !            28:        int     Bline;
        !            29:        int     Bseekp;
        !            30:        char    *Bfile;
        !            31:        int     Bseqid;
        !            32:        struct  B *Bnext;
        !            33: } *bottled;
        !            34: 
        !            35: /*
        !            36:  * Filename gives the current input file, lastname is
        !            37:  * the last filename we printed, and lastid is the seqid of the last line
        !            38:  * we printed, to help us avoid printing
        !            39:  * multiple copies of lines.
        !            40:  */
        !            41: extern char *filename;
        !            42: char   *lastname;
        !            43: int    lastid;
        !            44: 
        !            45: char   hadsome;
        !            46: char   holdbl;
        !            47: 
        !            48: /*
        !            49:  * Print the current line in the input line
        !            50:  * buffer or, in a forward move of the recovery, queue it for printing.
        !            51:  */
        !            52: yyoutline()
        !            53: {
        !            54:        register struct B *bp;
        !            55: 
        !            56:        if (Recovery) {
        !            57:                bp = tree(6, T_BOTTLE, yyline, yylinpt, filename, yyseqid);
        !            58:                if (bottled != NIL)
        !            59:                        bp->Bnext = bottled->Bnext, bottled->Bnext = bp;
        !            60:                else
        !            61:                        bp->Bnext = bp;
        !            62:                bottled = bp;
        !            63:                return;
        !            64:        }
        !            65:        yyoutfl(yyseqid);
        !            66:        if (yyseqid != lastid)
        !            67:                yyprline(charbuf, yyline, filename, yyseqid);
        !            68: }
        !            69: 
        !            70: /*
        !            71:  * Flush all the bottled output.
        !            72:  */
        !            73: yyflush()
        !            74: {
        !            75: 
        !            76:        yyoutfl(32767);
        !            77: }
        !            78: 
        !            79: /*
        !            80:  * Flush the listing to the sequence id toseqid
        !            81:  */
        !            82: yyoutfl(toseqid)
        !            83:        int toseqid;
        !            84: {
        !            85:        register struct B *bp;
        !            86: 
        !            87:        bp = bottled;
        !            88:        if (bp == NIL)
        !            89:                return;
        !            90:        bp = bp->Bnext;
        !            91:        while (bp->Bseqid <= toseqid) {
        !            92:                yygetline(bp->Bfile, bp->Bseekp, bp->Bline, bp->Bseqid);
        !            93:                if (bp->Bnext == bp) {
        !            94:                        bottled = NIL;
        !            95:                        break;
        !            96:                }
        !            97:                bp = bp->Bnext;
        !            98:                bottled->Bnext = bp;
        !            99:        }
        !           100: }
        !           101: 
        !           102: int    yygetunit -1;
        !           103: char   *yygetfile;
        !           104: 
        !           105: /*
        !           106:  * Yysync guarantees that the line associated
        !           107:  * with the current token was the last line
        !           108:  * printed for a syntactic error message.
        !           109:  */
        !           110: yysync()
        !           111: {
        !           112: 
        !           113:        yyoutfl(yyeseqid);
        !           114:        if (lastid != yyeseqid)
        !           115:                yygetline(yyefile, yyseekp, yyeline, yyeseqid);
        !           116: }
        !           117: 
        !           118: yySsync()
        !           119: {
        !           120: 
        !           121:        yyoutfl(OY.Yyeseqid);
        !           122: }
        !           123: 
        !           124: /*
        !           125:  * Yygetline gets a line from a file after we have
        !           126:  * lost it.  The pointer efile gives the name of the file,
        !           127:  * seekp its offset in the file, and eline its line number.
        !           128:  * If this routine has been called before the last file
        !           129:  * it worked on will be open in yygetunit, with the files
        !           130:  * name being given in yygetfile.  Note that this unit must
        !           131:  * be opened independently of the unit in use for normal i/o
        !           132:  * to this file; if it were a dup seeks would seek both files.
        !           133:  */
        !           134: yygetline(efile, seekp, eline, eseqid)
        !           135:        char *efile;
        !           136:        int seekp, eline, eseqid;
        !           137: {
        !           138:        register int cnt;
        !           139:        register char *bp;
        !           140:        char buf[CBSIZE + 1];
        !           141: 
        !           142:        if (lastid == eseqid)
        !           143:                return;
        !           144:        if (eseqid == yyseqid) {
        !           145:                bp = charbuf;
        !           146:                yyprtd++;
        !           147:        } else {
        !           148:                bp = buf;
        !           149:                if (efile != yygetfile) {
        !           150:                        close(yygetunit);
        !           151:                        yygetfile = efile;
        !           152:                        yygetunit = open(yygetfile, 0);
        !           153:                        if (yygetunit < 0)
        !           154: oops:
        !           155:                                perror(yygetfile), pexit(DIED);
        !           156:                } 
        !           157:                if (lseek(yygetunit, (long)seekp, 0) < 0)
        !           158:                        goto oops;
        !           159:                cnt = read(yygetunit, bp, CBSIZE);
        !           160:                if (cnt < 0)
        !           161:                        goto oops;
        !           162:                bp[cnt] = 0;
        !           163:        }
        !           164:        yyprline(bp, eline, efile, eseqid);
        !           165: }
        !           166: 
        !           167: yyretrieve()
        !           168: {
        !           169: 
        !           170:        yygetline(OY.Yyefile, OY.Yyseekp, OY.Yyeline, OY.Yyeseqid);
        !           171: }
        !           172: 
        !           173: /*
        !           174:  * Print the line in the character buffer which has
        !           175:  * line number line.  The buffer may be terminated by a new
        !           176:  * line character or a null character.  We process
        !           177:  * form feed directives, lines with only a form feed character, and
        !           178:  * suppress numbering lines which are empty here.
        !           179:  */
        !           180: yyprline(buf, line, file, id)
        !           181:        register char *buf;
        !           182:        int line;
        !           183:        char *file;
        !           184:        int id;
        !           185: {
        !           186: 
        !           187:        lastid = id;
        !           188:        if (buf[0] == '\f' && buf[1] == '\n') {
        !           189:                printf("\f\n");
        !           190:                hadsome = 0;
        !           191:                holdbl = 0;
        !           192:                return;
        !           193:        }
        !           194:        if (holdbl) {
        !           195:                putchar('\n');
        !           196:                holdbl = 0;
        !           197:        }
        !           198:        if (buf[0] == '\n')
        !           199:                holdbl = 1;
        !           200:        else {
        !           201:                yysetfile(file);
        !           202:                yyprintf(buf, line);
        !           203:        }
        !           204:        hadsome = 1;
        !           205: }
        !           206: 
        !           207: yyprintf(cp, line)
        !           208:        register char *cp;
        !           209:        int line;
        !           210: {
        !           211: 
        !           212:        printf("%6d  ", line);
        !           213:        while (*cp != 0 && *cp != '\n')
        !           214:                putchar(graphic(*cp++));
        !           215:        putchar('\n');
        !           216: }
        !           217: 
        !           218: graphic(ch)
        !           219:        register CHAR ch;
        !           220: {
        !           221: 
        !           222:        switch (ch) {
        !           223:                default:
        !           224:                        if (ch >= ' ')
        !           225:                                return (ch);
        !           226:                case 0177:
        !           227:                        return ('?');
        !           228:                case '\n':
        !           229:                case '\t':
        !           230:                        return (ch);
        !           231:        }
        !           232: }
        !           233: 
        !           234: extern int nopflg;
        !           235: 
        !           236: char   printed 1;
        !           237: /*
        !           238:  * Set the current file name to be file,
        !           239:  * printing the name, or a header on a new
        !           240:  * page if required.
        !           241:  */
        !           242: yysetfile(file)
        !           243:        register char *file;
        !           244: {
        !           245: 
        !           246: #ifdef PXP
        !           247:        if (nopflg == 1)
        !           248:                return;
        !           249: #endif
        !           250: 
        !           251:        if (lastname == file)
        !           252:                return;
        !           253:        if (file == filename && opt('n') && (printed & 02) == 0) {
        !           254:                printed =| 02;
        !           255:                header();
        !           256:        } else
        !           257:                yyputfn(file);
        !           258:        lastname = file;
        !           259: }
        !           260: 
        !           261: /*
        !           262:  * Put out an include file name
        !           263:  * if an error occurs but the name has
        !           264:  * not been printed (or if another name
        !           265:  * has been printed since it has).
        !           266:  */
        !           267: yyputfn(cp)
        !           268:        register char *cp;
        !           269: {
        !           270:        extern int outcol;
        !           271: 
        !           272:        if (cp == lastname && printed)
        !           273:                return;
        !           274:        lastname = cp;
        !           275:        printed = 1;
        !           276: #ifdef PXP
        !           277:        if (outcol)
        !           278:                putchar('\n');
        !           279: #endif
        !           280:        printf("%s:\n", cp);
        !           281:        hadsome = 1;
        !           282: }

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