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Annotation of 3BSD/cmd/pi/lookup.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 November 1978
        !             8:  */
        !             9: 
        !            10: #include "whoami"
        !            11: #include "0.h"
        !            12: 
        !            13: /*
        !            14:  * Lookup is called to
        !            15:  * find a symbol in the
        !            16:  * block structure symbol
        !            17:  * table and returns a pointer to
        !            18:  * its namelist entry.
        !            19:  */
        !            20: struct nl *
        !            21: lookup(s)
        !            22:        register char *s;
        !            23: {
        !            24:        register struct nl *p;
        !            25:        register struct udinfo *udp;
        !            26: 
        !            27:        if (s == NIL) {
        !            28:                nocascade();
        !            29:                return (NIL);
        !            30:        }
        !            31:        p = lookup1(s);
        !            32:        if (p == NIL) {
        !            33:                derror("%s is undefined", s);
        !            34:                return (NIL);
        !            35:        }
        !            36:        if (p->class == FVAR) {
        !            37:                p = p->chain;
        !            38:                bn--;
        !            39:        }
        !            40:        return (p);
        !            41: }
        !            42: 
        !            43: #ifndef PI0
        !            44: int    flagwas;
        !            45: #endif
        !            46: /*
        !            47:  * Lookup1 is an internal lookup.
        !            48:  * It is not an error to call lookup1
        !            49:  * if the symbol is not defined.  Also
        !            50:  * lookup1 will return FVARs while
        !            51:  * lookup never will, thus asgnop
        !            52:  * calls it when it thinks you are
        !            53:  * assigning to the function variable.
        !            54:  */
        !            55: 
        !            56: struct nl *
        !            57: lookup1(s)
        !            58:        register char *s;
        !            59: {
        !            60:        register struct nl *p;
        !            61: #ifndef PI0
        !            62:        register struct nl *q;
        !            63: #endif
        !            64:        register int i;
        !            65: 
        !            66:        if (s == NIL)
        !            67:                return (NIL);
        !            68:        bn = cbn;
        !            69: #ifndef PI0
        !            70:        /*
        !            71:         * We first check the field names
        !            72:         * of the currently active with
        !            73:         * statements (expensive since they
        !            74:         * are not hashed).
        !            75:         */
        !            76:        for (p = withlist; p != NIL; p = p->nl_next) {
        !            77:                q = p->type;
        !            78:                if (q == NIL)
        !            79:                        continue;
        !            80:                if (reclook(q, s) != NIL)
        !            81:                        /*
        !            82:                         * Return the WITHPTR, lvalue understands.
        !            83:                         */
        !            84:                        return (p);
        !            85:        }
        !            86: #endif
        !            87:        /*
        !            88:         * Symbol table is a 64 way hash
        !            89:         * on the low bits of the character
        !            90:         * pointer value. (Simple, but effective)
        !            91:         */
        !            92:        i = (int) s & 077;
        !            93:        for (p = disptab[i]; p != NIL; p = p->nl_next)
        !            94:                if (p->symbol == s && p->class != FIELD && p->class != BADUSE) {
        !            95:                        bn = (p->nl_block & 037);
        !            96: #ifndef PI0
        !            97:                        flagwas = p->nl_flags;
        !            98:                        p->nl_flags |= NUSED;
        !            99: #endif
        !           100:                        return (p);
        !           101:                }
        !           102:        return (NIL);
        !           103: }
        !           104: 
        !           105: #ifndef PI01
        !           106: nlfund(sp)
        !           107:        char *sp;
        !           108: {
        !           109:        register struct nl *p;
        !           110:        register int i;
        !           111: 
        !           112:        i = (int) sp & 077;
        !           113:        for (p = disptab[i]; p != NIL; p = p->nl_next)
        !           114:        if (p->symbol == sp && (p->nl_block & 037) == 0)
        !           115:                return (nloff(p));
        !           116:        return (0);
        !           117: }
        !           118: #endif

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