/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cpp.h"

extern int Cplusplus;
Nlist *kwdefined;
char wd[128];

/* 
	ER: Tabelle extra gross gemacht, da es anscheinend ein Problem mit der
	der Verkettung gibt, irgendwann irgendwo wird mal ein nlist->next
	ueberschrieben, was in eineme SIGSEGV resultiert.
	Den GDB mit watchpoint hab ich aber nach 2 Tagen abgebrochen..
	so loeppt's jedenfalls erstmal..
 */
#define	NLSIZE 15000

static Nlist *nlist[NLSIZE];

struct kwtab
{
    char *kw;
    int val;
    int flag;
}   kwtab[] =

{
		{"if", KIF, ISKW},
		{"ifdef", KIFDEF, ISKW},
		{"ifndef", KIFNDEF, ISKW},
		{"elif", KELIF, ISKW},
		{"else", KELSE, ISKW},
		{"endif", KENDIF, ISKW},
		{"include", KINCLUDE, ISKW},
		{"include_next", KINCLUDENEXT, ISKW},
		{"import", KIMPORT, ISKW},
		{"define", KDEFINE, ISKW},
		{"undef", KUNDEF, ISKW},
		{"line", KLINE, ISKW},
		{"error", KERROR, ISKW},
		{"pragma", KPRAGMA, ISKW},
		{"ident", KIDENT, ISKW},
		{"eval", KEVAL, ISKW},
		{"defined", KDEFINED, ISDEFINED + ISUNCHANGE},
		{"machine", KMACHINE, ISDEFINED + ISUNCHANGE},
		{"__LINE__", KLINENO, ISMAC + ISUNCHANGE},
		{"__FILE__", KFILE, ISMAC + ISUNCHANGE},
		{"__DATE__", KDATE, ISMAC + ISUNCHANGE},
		{"__TIME__", KTIME, ISMAC + ISUNCHANGE},
		{"__STDC__", KSTDC, ISUNCHANGE},
		{NULL, 0, 0}
};

unsigned long namebit[077 + 1];

void
    setup_kwtab(void)
{
    struct kwtab *kp;
    Nlist *np;
    Token t;
    static Token deftoken[1] = {{NAME, 0, 0, 7, (uchar *) "defined", 0}};
    static Tokenrow deftr = {deftoken, deftoken, deftoken + 1, 1};

    for (kp = kwtab; kp->kw; kp++)
    {
        t.t = (uchar *) kp->kw;
        t.len = strlen(kp->kw);
        np = lookup(&t, 1);
        np->flag = (char) kp->flag;
        np->val = (char) kp->val;
        if (np->val == KDEFINED)
        {
            kwdefined = np;
            np->val = NAME;
            np->vp = &deftr;
            np->ap = 0;
        }
    }
}

Nlist *
    lookup(Token * tp, int install)
{
    unsigned int h;
    Nlist *np;
    uchar *cp, *cpe;

    h = 0;
    for (cp = tp->t, cpe = cp + tp->len; cp < cpe;)
        h += *cp++;
    h %= NLSIZE;
    np = nlist[h];
    while (np)
    {
        if (*tp->t == *np->name && tp->len == (unsigned int)np->len
            && strncmp((char *)tp->t, (char *)np->name, tp->len) == 0)
            return np;
        np = np->next;
    }
    if (install)
    {
        np = new(Nlist);
        np->vp = NULL;
        np->ap = NULL;
        np->flag = 0;
        np->val = 0;
        np->len = tp->len;
        np->name = newstring(tp->t, tp->len, 0);
        np->next = nlist[h];
        nlist[h] = np;
        quickset(tp->t[0], tp->len > 1 ? tp->t[1] : 0);
        return np;
    }
    return NULL;
}