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/* $OpenBSD: lookup.c,v 1.14 2012/11/12 01:14:41 guenther Exp $ */
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "defs.h"
/* symbol types */
#define VAR 1
#define CONST 2
struct syment {
int s_type;
char *s_name;
struct namelist *s_value;
struct syment *s_next;
};
static struct syment *hashtab[HASHSIZE];
/*
* Define a variable from a command line argument.
*/
void
define(char *name)
{
char *cp, *s;
struct namelist *nl;
struct namelist *value;
debugmsg(DM_CALL, "define(%s)", name);
cp = strchr(name, '=');
if (cp == NULL)
value = NULL;
else if (cp[1] == '\0') {
*cp = '\0';
value = NULL;
} else if (cp[1] != '(') {
*cp++ = '\0';
value = makenl(cp);
} else {
value = NULL;
nl = NULL;
*cp++ = '\0';
do
cp++;
while (*cp == ' ' || *cp == '\t');
for (s = cp; ; s++) {
switch (*s) {
case ')':
*s = '\0';
case '\0':
break;
case ' ':
case '\t':
*s++ = '\0';
while (*s == ' ' || *s == '\t')
s++;
if (*s == ')')
*s = '\0';
break;
default:
continue;
}
if (nl == NULL)
value = nl = makenl(cp);
else {
nl->n_next = makenl(cp);
nl = nl->n_next;
}
if (*s == '\0')
break;
cp = s;
}
}
(void) lookup(name, REPLACE, value);
}
/*
* Lookup name in the table and return a pointer to it.
* LOOKUP - just do lookup, return NULL if not found.
* INSERT - insert name with value, error if already defined.
* REPLACE - insert or replace name with value.
*/
struct namelist *
lookup(char *name, int action, struct namelist *value)
{
unsigned int n;
char *cp;
struct syment *s;
char ebuf[BUFSIZ];
debugmsg(DM_CALL, "lookup(%s, %d, %p)", name, action, value);
n = 0;
for (cp = name; *cp; )
n += *cp++;
n %= HASHSIZE;
for (s = hashtab[n]; s != NULL; s = s->s_next) {
if (strcmp(name, s->s_name))
continue;
if (action != LOOKUP) {
if (action != INSERT || s->s_type != CONST) {
(void) snprintf(ebuf, sizeof(ebuf),
"%.*s redefined",
(int)(sizeof(ebuf) -
sizeof(" redefined")), name);
yyerror(ebuf);
}
}
return(s->s_value);
}
if (action == LOOKUP) {
(void) snprintf(ebuf, sizeof(ebuf), "%.*s undefined",
(int)(sizeof(ebuf) - sizeof(" undefined")),
name);
yyerror(ebuf);
return(NULL);
}
s = ALLOC(syment);
s->s_next = hashtab[n];
hashtab[n] = s;
s->s_type = action == INSERT ? VAR : CONST;
s->s_name = name;
s->s_value = value;
return(value);
}
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