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Synch with my current work.
Numerous changes:
- generate can build several tables
- style cleanup
- statistics code
- use variable names throughout (struct Name)
- recursive variables everywhere
- faster parser (pass buffer along instead of allocating multiple copies)
- correct parser. Handles comments everywhere, and ; correctly
- more string intervals
- simplified dir.c, less recursion.
- extended for loops
- sinclude()
- finished removing extra junk from Lst_*
- handles ${@D} and friends in a simpler way
- cleaned up and modular VarModifiers handling.
- recognizes some gnu Makefile usages and errors out about them.

Additionally, some extra functionality is defined by FEATURES. The set of
functionalities is currently hardcoded to OpenBSD defaults, but this may
include support for some NetBSD extensions, like ODE modifiers.

Backed by miod@ and millert@, who finally got sick of my endless patches...

/*	$OpenPackages$ */
/*	$OpenBSD: extern.h,v 1.37 2001/05/03 13:41:05 espie Exp $	*/
/*	$NetBSD: nonints.h,v 1.12 1996/11/06 17:59:19 christos Exp $	*/

/*-
 * Copyright (c) 1988, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	from: @(#)nonints.h	8.3 (Berkeley) 3/19/94
 */

/* arch.c */
extern ReturnStatus Arch_ParseArchive(char **, Lst, SymTable *);
extern void Arch_Touch(GNode *);
extern void Arch_TouchLib(GNode *);
extern TIMESTAMP Arch_MTime(GNode *);
extern TIMESTAMP Arch_MemMTime(GNode *);
extern void Arch_FindLib(GNode *, Lst);
extern Boolean Arch_LibOODate(GNode *);
extern void Arch_Init(void);
extern void Arch_End(void);
extern Boolean Arch_IsLib(GNode *);

/* compat.c */
extern void Compat_Run(Lst);

/* cond.c */
extern int Cond_Eval(char *);
extern void Cond_End(void);

#include "error.h"

/* for.c */
typedef struct For_ For;
extern For *For_Eval(const char *);
extern Boolean For_Accumulate(For *, const char *);
extern void For_Run (For *);

/* main.c */
extern void Main_ParseArgLine(char *);
extern char *Cmd_Exec(const char *, char **);
extern void Error(char *, ...);
extern void Fatal(char *, ...);
extern void Punt(char *, ...);
extern void DieHorribly(void);
extern void PrintAddr(void *);
extern void Finish(int);

/* make.c */
extern void Make_TimeStamp(GNode *, GNode *);
extern Boolean Make_OODate(GNode *);
extern void Make_HandleUse(GNode *, GNode *);
extern void Make_Update(GNode *);
extern void Make_DoAllVar(GNode *);
extern Boolean Make_Run(Lst);

/* parse.c */
extern void Parse_Error(int, char *, ...);
extern Boolean Parse_AnyExport(void);
extern Boolean Parse_IsVar(char *);
extern void Parse_DoVar(const char *, GSymT *);
extern void Parse_AddIncludeDir(const char *);
extern void Parse_File(char *, FILE *);
extern void Parse_Init(void);
extern void Parse_End(void);
extern void Parse_FromString(char *, unsigned long);
extern unsigned long Parse_Getlineno(void);
extern const char *Parse_Getfilename(void);
extern void Parse_MainName(Lst);

/* stats.h */
extern void Init_Stats(void);

/* str.c */
extern void str_init(void);
extern void str_end(void);
extern char *lastchar(const char *, const char *, int);
extern char *str_concati(const char *, const char *, const char *, int);
#define str_concat(s1, s2, sep) str_concati(s1, s2, strchr(s2, '\0'), sep)
extern char **brk_string(const char *, int *, char **);
extern const char *iterate_words(const char **);
extern Boolean Str_Matchi(const char *, const char *, const char *);
#define Str_Match(string, pattern) \
	Str_Matchi(string, pattern, strchr(pattern, '\0'))
extern const char *Str_SYSVMatch(const char *, const char *, size_t *);
extern void Str_SYSVSubst(Buffer, const char *, const char *, size_t);
extern char *interval_dup(const char *, const char *);
extern char *escape_dup(const char *, const char *, const char *);

/* suff.c */
extern void Suff_ClearSuffixes(void);
extern Boolean Suff_IsTransform(const char *);
extern GNode *Suff_AddTransform(const char *);
extern void Suff_EndTransform(void *);
extern void Suff_AddSuffix(char *);
extern Lst Suff_GetPath(char *);
extern void Suff_DoPaths(void);
extern void Suff_AddInclude(char *);
extern void Suff_AddLib(char *);
extern void Suff_FindDeps(GNode *);
extern void Suff_SetNull(char *);
extern void Suff_Init(void);
extern void Suff_End(void);
extern void Suff_PrintAll(void);

/* targ.c */
extern void Targ_Init(void);
extern void Targ_End(void);
extern GNode *Targ_NewGN(const char *, const char *);
extern GNode *Targ_FindNode(const char *, const char *, int);
extern void Targ_FindList(Lst, Lst);
extern Boolean Targ_Ignore(GNode *);
extern Boolean Targ_Silent(GNode *);
extern Boolean Targ_Precious(GNode *);
extern void Targ_SetMain(GNode *);
extern void Targ_PrintCmd(void *);
extern char *Targ_FmtTime(TIMESTAMP);
extern void Targ_PrintType(int);
extern void Targ_PrintGraph(int);

/* var.c */
extern void Var_Delete(const char *);
extern void Var_Set_interval(const char *, const char *, const char *,
	GSymT *);
extern void Varq_Set(int, const char *, GNode *);
extern void Var_Append_interval(const char *, const char *,
	const char *, GSymT  *);
extern void Varq_Append(int, const char *, GNode *);
extern char *Var_Value_interval(const char *, const char *);
extern char *Varq_Value(int,  GNode *);
extern char *Var_Parse(const char *, SymTable *, Boolean, size_t *,
	Boolean *);
extern size_t Var_ParseSkip(const char *, SymTable *, ReturnStatus *);
extern ReturnStatus Var_ParseBuffer(Buffer, const char *, SymTable *,
	Boolean, size_t *);
extern char *Var_Subst(const char *, SymTable *, Boolean);
extern void Var_SubstVar(Buffer, const char *, const char *, const char *);
extern void Var_Init(void);
extern void Var_End(void);
extern void Var_Dump(void);
extern void SymTable_Init(SymTable *);
extern void SymTable_Destroy(SymTable *);
#define Var_Set(n, v, ctxt)	Var_Set_interval(n, NULL, v, ctxt)
#define Var_Append(n, v, ctxt)	Var_Append_interval(n, NULL, v, ctxt)
#define Var_Value(n)	Var_Value_interval(n, NULL)
extern void Var_AddCmdline(const char *);

/* Used to store temporary names, after $ expansion */
struct Name {
	const char 	*s;
	const char 	*e;
	Boolean		tofree;
};

extern const char *Var_Name_Get(const char *, struct Name *, SymTable *, 
    Boolean, const char *(*)(const char *));
extern void Var_Name_Free(struct Name *);