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Annotation of 43BSDTahoe/usr.lib/sendmail/src/stab.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted
        !             7:  * provided that the above copyright notice and this paragraph are
        !             8:  * duplicated in all such forms and that any documentation,
        !             9:  * advertising materials, and other materials related to such
        !            10:  * distribution and use acknowledge that the software was developed
        !            11:  * by the University of California, Berkeley.  The name of the
        !            12:  * University may not be used to endorse or promote products derived
        !            13:  * from this software without specific prior written permission.
        !            14:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            16:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17:  */
        !            18: 
        !            19: #ifndef lint
        !            20: static char sccsid[] = "@(#)stab.c     5.5 (Berkeley) 6/30/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: # include "sendmail.h"
        !            24: 
        !            25: /*
        !            26: **  STAB -- manage the symbol table
        !            27: **
        !            28: **     Parameters:
        !            29: **             name -- the name to be looked up or inserted.
        !            30: **             type -- the type of symbol.
        !            31: **             op -- what to do:
        !            32: **                     ST_ENTER -- enter the name if not
        !            33: **                             already present.
        !            34: **                     ST_FIND -- find it only.
        !            35: **
        !            36: **     Returns:
        !            37: **             pointer to a STAB entry for this name.
        !            38: **             NULL if not found and not entered.
        !            39: **
        !            40: **     Side Effects:
        !            41: **             can update the symbol table.
        !            42: */
        !            43: 
        !            44: # define STABSIZE      400
        !            45: 
        !            46: static STAB    *SymTab[STABSIZE];
        !            47: 
        !            48: STAB *
        !            49: stab(name, type, op)
        !            50:        char *name;
        !            51:        int type;
        !            52:        int op;
        !            53: {
        !            54:        register STAB *s;
        !            55:        register STAB **ps;
        !            56:        register int hfunc;
        !            57:        register char *p;
        !            58:        extern char lower();
        !            59: 
        !            60: # ifdef DEBUG
        !            61:        if (tTd(36, 5))
        !            62:                printf("STAB: %s %d ", name, type);
        !            63: # endif DEBUG
        !            64: 
        !            65:        /*
        !            66:        **  Compute the hashing function
        !            67:        **
        !            68:        **      We could probably do better....
        !            69:        */
        !            70: 
        !            71:        hfunc = type;
        !            72:        for (p = name; *p != '\0'; p++)
        !            73:                hfunc = (((hfunc << 7) | lower(*p)) & 077777) % STABSIZE;
        !            74: 
        !            75: # ifdef DEBUG
        !            76:        if (tTd(36, 9))
        !            77:                printf("(hfunc=%d) ", hfunc);
        !            78: # endif DEBUG
        !            79: 
        !            80:        ps = &SymTab[hfunc];
        !            81:        while ((s = *ps) != NULL && (strcasecmp(name, s->s_name) || s->s_type != type))
        !            82:                ps = &s->s_next;
        !            83: 
        !            84:        /*
        !            85:        **  Dispose of the entry.
        !            86:        */
        !            87: 
        !            88:        if (s != NULL || op == ST_FIND)
        !            89:        {
        !            90: # ifdef DEBUG
        !            91:                if (tTd(36, 5))
        !            92:                {
        !            93:                        if (s == NULL)
        !            94:                                printf("not found\n");
        !            95:                        else
        !            96:                        {
        !            97:                                long *lp = (long *) s->s_class;
        !            98: 
        !            99:                                printf("type %d val %lx %lx %lx %lx\n",
        !           100:                                        s->s_type, lp[0], lp[1], lp[2], lp[3]);
        !           101:                        }
        !           102:                }
        !           103: # endif DEBUG
        !           104:                return (s);
        !           105:        }
        !           106: 
        !           107:        /*
        !           108:        **  Make a new entry and link it in.
        !           109:        */
        !           110: 
        !           111: # ifdef DEBUG
        !           112:        if (tTd(36, 5))
        !           113:                printf("entered\n");
        !           114: # endif DEBUG
        !           115: 
        !           116:        /* make new entry */
        !           117:        s = (STAB *) xalloc(sizeof *s);
        !           118:        bzero((char *) s, sizeof *s);
        !           119:        s->s_name = newstr(name);
        !           120:        makelower(s->s_name);
        !           121:        s->s_type = type;
        !           122: 
        !           123:        /* link it in */
        !           124:        *ps = s;
        !           125: 
        !           126:        return (s);
        !           127: }

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