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This is the first step in sanitizing the conditional parser.

Change the conditional recognition algorithm:
scan for a sequence of alphabetic characters, hash it, and compare it against
a small table (using ohash functions).
This makes Cond_Eval entry more logical, and allows for some shortcuts in
recognizing .include, .for, .undef.

This also means that conditionals must have an intervening blank between
the keyword and the actual test, e.g.,
.ifA
will no longer work.

(but no-one actually uses this, and it's highly obfuscated)

Okay miod@.

/*	$OpenPackages$ */
/*	$OpenBSD: generate.c,v 1.5 2002/06/11 21:12:11 espie Exp $ */

/*
 * Copyright (c) 2001 Marc Espie.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
 * PROJECT 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 <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#include "stats.h"
#include "ohash.h"
#include "cond_int.h"
#include "var_int.h"

#define M(x)	x, #x
char *table_var[] = {
	M(TARGET),
	M(OODATE),
	M(ALLSRC),
	M(IMPSRC),
	M(PREFIX),
	M(ARCHIVE),
	M(MEMBER),
	M(LONGTARGET),
	M(LONGOODATE),
	M(LONGALLSRC),
	M(LONGIMPSRC),
	M(LONGPREFIX),
	M(LONGARCHIVE),
	M(LONGMEMBER),
	M(FTARGET),
	M(DTARGET),
	M(FPREFIX),
	M(DPREFIX),
	M(FARCHIVE),
	M(DARCHIVE),
	M(FMEMBER),
	M(DMEMBER),
	NULL
};

char *table_cond[] = {
	M(COND_IF),
	M(COND_IFDEF),
	M(COND_IFNDEF),
	M(COND_IFMAKE),
	M(COND_IFNMAKE),
	M(COND_ELSE),
	M(COND_ELIF),
	M(COND_ELIFDEF),
	M(COND_ELIFNDEF),
	M(COND_ELIFMAKE),
	M(COND_ELIFNMAKE),
	M(COND_ENDIF),
	M(COND_FOR),
	M(COND_ENDFOR),
	M(COND_INCLUDE),
	M(COND_UNDEF),
	NULL
};


char **table[] = {
	table_var,
	table_cond
};

int
main(int argc, char *argv[])
{
	u_int32_t i;
	u_int32_t v;
	u_int32_t h;
	u_int32_t slots;
	const char *e;
	char **occupied;
	char **t;
	int tn;

	Init_Stats();
	if (argc != 3)
		exit(1);

	tn = atoi(argv[1]);
	if (!tn)
		exit(1);
	t = table[tn-1];
	slots = atoi(argv[2]);
	if (slots) {
		occupied = malloc(sizeof(char *) * slots);
		if (!occupied)
			exit(1);
		for (i = 0; i < slots; i++)
			occupied[i] = NULL;
	} else
		occupied = NULL;

	printf("/* File created by generate %d %d, do not edit */\n", 
	    tn, slots);
	for (i = 0; t[i] != NULL; i++) {
		e = NULL;
		v = ohash_interval(t[i], &e);
		if (slots) {
			h = v % slots;
			if (occupied[h]) {
				fprintf(stderr, 
				    "Collision: %s / %s (%d)\n", occupied[h],
				    t[i], h);
				exit(1);
			}
			occupied[h] = t[i];
		}
		i++;
		printf("#define K_%s %u\n", t[i], v);
	}
	if (slots)
		printf("#define MAGICSLOTS%d %u\n", tn, slots);
	exit(0);
}