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lookup.c revision 1.5 
      1 /*	$NetBSD: lookup.c,v 1.5 1996/07/12 00:46:25 thorpej 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 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)lookup.c	8.1 (Berkeley) 6/9/93";
     39 #else
     40 static char *rcsid = "$NetBSD: lookup.c,v 1.5 1996/07/12 00:46:25 thorpej Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include "defs.h"
     45 
     46 	/* symbol types */
     47 #define VAR	1
     48 #define CONST	2
     49 
     50 struct syment {
     51 	int	s_type;
     52 	char	*s_name;
     53 	struct	namelist *s_value;
     54 	struct	syment *s_next;
     55 };
     56 
     57 static struct syment *hashtab[HASHSIZE];
     58 
     59 /*
     60  * Define a variable from a command line argument.
     61  */
     62 void
     63 define(name)
     64 	char *name;
     65 {
     66 	register char *cp, *s;
     67 	register struct namelist *nl;
     68 	struct namelist *value;
     69 
     70 	if (debug)
     71 		printf("define(%s)\n", name);
     72 
     73 	cp = index(name, '=');
     74 	if (cp == NULL)
     75 		value = NULL;
     76 	else if (cp[1] == '\0') {
     77 		*cp = '\0';
     78 		value = NULL;
     79 	} else if (cp[1] != '(') {
     80 		*cp++ = '\0';
     81 		value = makenl(cp);
     82 	} else {
     83 		nl = NULL;
     84 		*cp++ = '\0';
     85 		do
     86 			cp++;
     87 		while (*cp == ' ' || *cp == '\t');
     88 		for (s = cp; ; s++) {
     89 			switch (*s) {
     90 			case ')':
     91 				*s = '\0';
     92 			case '\0':
     93 				break;
     94 			case ' ':
     95 			case '\t':
     96 				*s++ = '\0';
     97 				while (*s == ' ' || *s == '\t')
     98 					s++;
     99 				if (*s == ')')
    100 					*s = '\0';
    101 				break;
    102 			default:
    103 				continue;
    104 			}
    105 			if (nl == NULL)
    106 				value = nl = makenl(cp);
    107 			else {
    108 				nl->n_next = makenl(cp);
    109 				nl = nl->n_next;
    110 			}
    111 			if (*s == '\0')
    112 				break;
    113 			cp = s;
    114 		}
    115 	}
    116 	(void) lookup(name, REPLACE, value);
    117 }
    118 
    119 /*
    120  * Lookup name in the table and return a pointer to it.
    121  * LOOKUP - just do lookup, return NULL if not found.
    122  * INSERT - insert name with value, error if already defined.
    123  * REPLACE - insert or replace name with value.
    124  */
    125 
    126 struct namelist *
    127 lookup(name, action, value)
    128 	char *name;
    129 	int action;
    130 	struct namelist *value;
    131 {
    132 	register unsigned n;
    133 	register char *cp;
    134 	register struct syment *s;
    135 	char buf[256];
    136 
    137 	if (debug)
    138 		printf("lookup(%s, %d, %x)\n", name, action, value);
    139 
    140 	n = 0;
    141 	for (cp = name; *cp; )
    142 		n += *cp++;
    143 	n %= HASHSIZE;
    144 
    145 	for (s = hashtab[n]; s != NULL; s = s->s_next) {
    146 		if (strcmp(name, s->s_name))
    147 			continue;
    148 		if (action != LOOKUP) {
    149 			if (action != INSERT || s->s_type != CONST) {
    150 				(void)snprintf(buf, sizeof(buf),
    151 				    "%s redefined", name);
    152 				yyerror(buf);
    153 			}
    154 		}
    155 		return(s->s_value);
    156 	}
    157 
    158 	if (action == LOOKUP) {
    159 		(void)snprintf(buf, sizeof(buf), "%s undefined", name);
    160 		yyerror(buf);
    161 		return(NULL);
    162 	}
    163 
    164 	s = ALLOC(syment);
    165 	if (s == NULL)
    166 		fatal("ran out of memory\n");
    167 	s->s_next = hashtab[n];
    168 	hashtab[n] = s;
    169 	s->s_type = action == INSERT ? VAR : CONST;
    170 	s->s_name = name;
    171 	s->s_value = value;
    172 	return(value);
    173 }
    174