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Revision 1.2, Tue Jun 11 21:12:11 2002 UTC (21 years, 11 months ago) by espie
Branch: MAIN
CVS Tags: OPENBSD_4_1_BASE, OPENBSD_4_1, OPENBSD_4_0_BASE, OPENBSD_4_0, OPENBSD_3_9_BASE, OPENBSD_3_9, OPENBSD_3_8_BASE, OPENBSD_3_8, OPENBSD_3_7_BASE, OPENBSD_3_7, OPENBSD_3_6_BASE, OPENBSD_3_6, OPENBSD_3_5_BASE, OPENBSD_3_5, OPENBSD_3_4_BASE, OPENBSD_3_4, OPENBSD_3_3_BASE, OPENBSD_3_3, OPENBSD_3_2_BASE, OPENBSD_3_2
Changes since 1.1: +4 -1 lines 

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@.

#ifndef COND_H
#define COND_H
/*	$OpenPackages$ */
/*	$OpenBSD: cond.h,v 1.2 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.
 */

/* cond
 *	Parse Makefile conditionals.
 */

/* Values returned by Cond_Eval.  */
#define COND_PARSE	0	/* Parse the next lines */
#define COND_SKIP	1	/* Skip the next lines */
#define COND_INVALID	2	/* Not a conditional statement */
#define COND_ISFOR	3
#define COND_ISUNDEF	4
#define COND_ISINCLUDE	5

/* whattodo = Cond_Eval(line);
 *	Parses a conditional expression (without the leading dot),
 *	and returns a decision value.
 *	State is kept internally, since conditionals nest.  */
extern int Cond_Eval(const char *);

/* Cond_End();
 *	To call at end of parsing, checks that all conditionals were
 *	closed.  */
extern void Cond_End(void);

#endif