Return to lookup.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / ucb / rdist

Annotation of 43BSDTahoe/ucb/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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)lookup.c   5.4 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "defs.h"
        !            23: 
        !            24:        /* symbol types */
        !            25: #define VAR    1
        !            26: #define CONST  2
        !            27: 
        !            28: struct syment {
        !            29:        int     s_type;
        !            30:        char    *s_name;
        !            31:        struct  namelist *s_value;
        !            32:        struct  syment *s_next;
        !            33: };
        !            34: 
        !            35: static struct syment *hashtab[HASHSIZE];
        !            36: 
        !            37: /*
        !            38:  * Define a variable from a command line argument.
        !            39:  */
        !            40: define(name)
        !            41:        char *name;
        !            42: {
        !            43:        register char *cp, *s;
        !            44:        register struct namelist *nl;
        !            45:        struct namelist *value;
        !            46: 
        !            47:        if (debug)
        !            48:                printf("define(%s)\n", name);
        !            49: 
        !            50:        cp = index(name, '=');
        !            51:        if (cp == NULL)
        !            52:                value = NULL;
        !            53:        else if (cp[1] == '\0') {
        !            54:                *cp = '\0';
        !            55:                value = NULL;
        !            56:        } else if (cp[1] != '(') {
        !            57:                *cp++ = '\0';
        !            58:                value = makenl(cp);
        !            59:        } else {
        !            60:                nl = NULL;
        !            61:                *cp++ = '\0';
        !            62:                do
        !            63:                        cp++;
        !            64:                while (*cp == ' ' || *cp == '\t');
        !            65:                for (s = cp; ; s++) {
        !            66:                        switch (*s) {
        !            67:                        case ')':
        !            68:                                *s = '\0';
        !            69:                        case '\0':
        !            70:                                break;
        !            71:                        case ' ':
        !            72:                        case '\t':
        !            73:                                *s++ = '\0';
        !            74:                                while (*s == ' ' || *s == '\t')
        !            75:                                        s++;
        !            76:                                if (*s == ')')
        !            77:                                        *s = '\0';
        !            78:                                break;
        !            79:                        default:
        !            80:                                continue;
        !            81:                        }
        !            82:                        if (nl == NULL)
        !            83:                                value = nl = makenl(cp);
        !            84:                        else {
        !            85:                                nl->n_next = makenl(cp);
        !            86:                                nl = nl->n_next;
        !            87:                        }
        !            88:                        if (*s == '\0')
        !            89:                                break;
        !            90:                        cp = s;
        !            91:                }
        !            92:        }
        !            93:        (void) lookup(name, REPLACE, value);
        !            94: }
        !            95: 
        !            96: /*
        !            97:  * Lookup name in the table and return a pointer to it.
        !            98:  * LOOKUP - just do lookup, return NULL if not found.
        !            99:  * INSERT - insert name with value, error if already defined.
        !           100:  * REPLACE - insert or replace name with value.
        !           101:  */
        !           102: 
        !           103: struct namelist *
        !           104: lookup(name, action, value)
        !           105:        char *name;
        !           106:        int action;
        !           107:        struct namelist *value;
        !           108: {
        !           109:        register unsigned n;
        !           110:        register char *cp;
        !           111:        register struct syment *s;
        !           112:        char buf[256];
        !           113: 
        !           114:        if (debug)
        !           115:                printf("lookup(%s, %d, %x)\n", name, action, value);
        !           116: 
        !           117:        n = 0;
        !           118:        for (cp = name; *cp; )
        !           119:                n += *cp++;
        !           120:        n %= HASHSIZE;
        !           121: 
        !           122:        for (s = hashtab[n]; s != NULL; s = s->s_next) {
        !           123:                if (strcmp(name, s->s_name))
        !           124:                        continue;
        !           125:                if (action != LOOKUP) {
        !           126:                        if (action != INSERT || s->s_type != CONST) {
        !           127:                                (void)sprintf(buf, "%s redefined", name);
        !           128:                                yyerror(buf);
        !           129:                        }
        !           130:                }
        !           131:                return(s->s_value);
        !           132:        }
        !           133: 
        !           134:        if (action == LOOKUP) {
        !           135:                (void)sprintf(buf, "%s undefined", name);
        !           136:                yyerror(buf);
        !           137:                return(NULL);
        !           138:        }
        !           139: 
        !           140:        s = ALLOC(syment);
        !           141:        if (s == NULL)
        !           142:                fatal("ran out of memory\n");
        !           143:        s->s_next = hashtab[n];
        !           144:        hashtab[n] = s;
        !           145:        s->s_type = action == INSERT ? VAR : CONST;
        !           146:        s->s_name = name;
        !           147:        s->s_value = value;
        !           148:        return(value);
        !           149: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.