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lookup.c revision 1.6 
      1 /*	$NetBSD: lookup.c,v 1.6 1997/10/19 13:59:04 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)lookup.c	8.1 (Berkeley) 6/9/93";
     40 #else
     41 __RCSID("$NetBSD: lookup.c,v 1.6 1997/10/19 13:59:04 lukem Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include "defs.h"
     46 
     47 	/* symbol types */
     48 #define VAR	1
     49 #define CONST	2
     50 
     51 struct syment {
     52 	int	s_type;
     53 	char	*s_name;
     54 	struct	namelist *s_value;
     55 	struct	syment *s_next;
     56 };
     57 
     58 static struct syment *hashtab[HASHSIZE];
     59 
     60 /*
     61  * Define a variable from a command line argument.
     62  */
     63 void
     64 define(name)
     65 	char *name;
     66 {
     67 	char *cp, *s;
     68 	struct namelist *nl;
     69 	struct namelist *value;
     70 
     71 	value = NULL;
     72 
     73 	if (debug)
     74 		printf("define(%s)\n", name);
     75 
     76 	cp = strchr(name, '=');
     77 	if (cp == NULL)
     78 		value = NULL;
     79 	else if (cp[1] == '\0') {
     80 		*cp = '\0';
     81 		value = NULL;
     82 	} else if (cp[1] != '(') {
     83 		*cp++ = '\0';
     84 		value = makenl(cp);
     85 	} else {
     86 		nl = NULL;
     87 		*cp++ = '\0';
     88 		do
     89 			cp++;
     90 		while (*cp == ' ' || *cp == '\t');
     91 		for (s = cp; ; s++) {
     92 			switch (*s) {
     93 			case ')':
     94 				*s = '\0';
     95 			case '\0':
     96 				break;
     97 			case ' ':
     98 			case '\t':
     99 				*s++ = '\0';
    100 				while (*s == ' ' || *s == '\t')
    101 					s++;
    102 				if (*s == ')')
    103 					*s = '\0';
    104 				break;
    105 			default:
    106 				continue;
    107 			}
    108 			if (nl == NULL)
    109 				value = nl = makenl(cp);
    110 			else {
    111 				nl->n_next = makenl(cp);
    112 				nl = nl->n_next;
    113 			}
    114 			if (*s == '\0')
    115 				break;
    116 			cp = s;
    117 		}
    118 	}
    119 	(void) lookup(name, REPLACE, value);
    120 }
    121 
    122 /*
    123  * Lookup name in the table and return a pointer to it.
    124  * LOOKUP - just do lookup, return NULL if not found.
    125  * INSERT - insert name with value, error if already defined.
    126  * REPLACE - insert or replace name with value.
    127  */
    128 
    129 struct namelist *
    130 lookup(name, action, value)
    131 	char *name;
    132 	int action;
    133 	struct namelist *value;
    134 {
    135 	unsigned n;
    136 	char *cp;
    137 	struct syment *s;
    138 	char buf[256];
    139 
    140 	if (debug)
    141 		printf("lookup(%s, %d, %lx)\n", name, action, (long)value);
    142 
    143 	n = 0;
    144 	for (cp = name; *cp; )
    145 		n += *cp++;
    146 	n %= HASHSIZE;
    147 
    148 	for (s = hashtab[n]; s != NULL; s = s->s_next) {
    149 		if (strcmp(name, s->s_name))
    150 			continue;
    151 		if (action != LOOKUP) {
    152 			if (action != INSERT || s->s_type != CONST) {
    153 				(void)snprintf(buf, sizeof(buf),
    154 				    "%s redefined", name);
    155 				yyerror(buf);
    156 			}
    157 		}
    158 		return(s->s_value);
    159 	}
    160 
    161 	if (action == LOOKUP) {
    162 		(void)snprintf(buf, sizeof(buf), "%s undefined", name);
    163 		yyerror(buf);
    164 		return(NULL);
    165 	}
    166 
    167 	s = ALLOC(syment);
    168 	if (s == NULL)
    169 		fatal("ran out of memory\n");
    170 	s->s_next = hashtab[n];
    171 	hashtab[n] = s;
    172 	s->s_type = action == INSERT ? VAR : CONST;
    173 	s->s_name = name;
    174 	s->s_value = value;
    175 	return(value);
    176 }
    177