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Annotation of 43BSDReno/usr.bin/rdist/lookup.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)lookup.c   5.5 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "defs.h"
        !            25: 
        !            26:        /* symbol types */
        !            27: #define VAR    1
        !            28: #define CONST  2
        !            29: 
        !            30: struct syment {
        !            31:        int     s_type;
        !            32:        char    *s_name;
        !            33:        struct  namelist *s_value;
        !            34:        struct  syment *s_next;
        !            35: };
        !            36: 
        !            37: static struct syment *hashtab[HASHSIZE];
        !            38: 
        !            39: /*
        !            40:  * Define a variable from a command line argument.
        !            41:  */
        !            42: define(name)
        !            43:        char *name;
        !            44: {
        !            45:        register char *cp, *s;
        !            46:        register struct namelist *nl;
        !            47:        struct namelist *value;
        !            48: 
        !            49:        if (debug)
        !            50:                printf("define(%s)\n", name);
        !            51: 
        !            52:        cp = index(name, '=');
        !            53:        if (cp == NULL)
        !            54:                value = NULL;
        !            55:        else if (cp[1] == '\0') {
        !            56:                *cp = '\0';
        !            57:                value = NULL;
        !            58:        } else if (cp[1] != '(') {
        !            59:                *cp++ = '\0';
        !            60:                value = makenl(cp);
        !            61:        } else {
        !            62:                nl = NULL;
        !            63:                *cp++ = '\0';
        !            64:                do
        !            65:                        cp++;
        !            66:                while (*cp == ' ' || *cp == '\t');
        !            67:                for (s = cp; ; s++) {
        !            68:                        switch (*s) {
        !            69:                        case ')':
        !            70:                                *s = '\0';
        !            71:                        case '\0':
        !            72:                                break;
        !            73:                        case ' ':
        !            74:                        case '\t':
        !            75:                                *s++ = '\0';
        !            76:                                while (*s == ' ' || *s == '\t')
        !            77:                                        s++;
        !            78:                                if (*s == ')')
        !            79:                                        *s = '\0';
        !            80:                                break;
        !            81:                        default:
        !            82:                                continue;
        !            83:                        }
        !            84:                        if (nl == NULL)
        !            85:                                value = nl = makenl(cp);
        !            86:                        else {
        !            87:                                nl->n_next = makenl(cp);
        !            88:                                nl = nl->n_next;
        !            89:                        }
        !            90:                        if (*s == '\0')
        !            91:                                break;
        !            92:                        cp = s;
        !            93:                }
        !            94:        }
        !            95:        (void) lookup(name, REPLACE, value);
        !            96: }
        !            97: 
        !            98: /*
        !            99:  * Lookup name in the table and return a pointer to it.
        !           100:  * LOOKUP - just do lookup, return NULL if not found.
        !           101:  * INSERT - insert name with value, error if already defined.
        !           102:  * REPLACE - insert or replace name with value.
        !           103:  */
        !           104: 
        !           105: struct namelist *
        !           106: lookup(name, action, value)
        !           107:        char *name;
        !           108:        int action;
        !           109:        struct namelist *value;
        !           110: {
        !           111:        register unsigned n;
        !           112:        register char *cp;
        !           113:        register struct syment *s;
        !           114:        char buf[256];
        !           115: 
        !           116:        if (debug)
        !           117:                printf("lookup(%s, %d, %x)\n", name, action, value);
        !           118: 
        !           119:        n = 0;
        !           120:        for (cp = name; *cp; )
        !           121:                n += *cp++;
        !           122:        n %= HASHSIZE;
        !           123: 
        !           124:        for (s = hashtab[n]; s != NULL; s = s->s_next) {
        !           125:                if (strcmp(name, s->s_name))
        !           126:                        continue;
        !           127:                if (action != LOOKUP) {
        !           128:                        if (action != INSERT || s->s_type != CONST) {
        !           129:                                (void)sprintf(buf, "%s redefined", name);
        !           130:                                yyerror(buf);
        !           131:                        }
        !           132:                }
        !           133:                return(s->s_value);
        !           134:        }
        !           135: 
        !           136:        if (action == LOOKUP) {
        !           137:                (void)sprintf(buf, "%s undefined", name);
        !           138:                yyerror(buf);
        !           139:                return(NULL);
        !           140:        }
        !           141: 
        !           142:        s = ALLOC(syment);
        !           143:        if (s == NULL)
        !           144:                fatal("ran out of memory\n");
        !           145:        s->s_next = hashtab[n];
        !           146:        hashtab[n] = s;
        !           147:        s->s_type = action == INSERT ? VAR : CONST;
        !           148:        s->s_name = name;
        !           149:        s->s_value = value;
        !           150:        return(value);
        !           151: }

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