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Annotation of 43BSDTahoe/usr.lib/sendmail/src/stab.c, revision 1.1.1.1

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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