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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: files.c,v 1.20 2015/01/16 06:40:16 deraadt Exp $	*/
/*	$NetBSD: files.c,v 1.6 1996/03/17 13:18:17 cgd Exp $	*/

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratories.
 *
 * 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.
 *
 *	from: @(#)files.c	8.1 (Berkeley) 6/6/93
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "config.h"

extern const char *yyfile;

/*
 * We check that each full path name is unique.  File base names
 * should generally also be unique, e.g., having both a net/xx.c and
 * a kern/xx.c (or, worse, a net/xx.c and a new/xx.c++) is probably
 * wrong, but is permitted under some conditions.
 */
static struct hashtab *basetab;		/* file base names */
static struct hashtab *pathtab;		/* full path names */

static struct files **nextfile;
static struct files **unchecked;

static struct objects **nextobject;

static int	checkaux(const char *, void *);
static int	fixcount(const char *, void *);
static int	fixfsel(const char *, void *);
static int	fixsel(const char *, void *);
static int	expr_eval(struct nvlist *,
		    int (*)(const char *, void *), void *);
static void	expr_free(struct nvlist *);

#ifdef DEBUG
static void	pr0();
#endif

void
initfiles(void)
{

	basetab = ht_new();
	pathtab = ht_new();
	nextfile = &allfiles;
	unchecked = &allfiles;
	nextobject = &allobjects;
}

void
addfile(struct nvlist *nvpath, struct nvlist *optx, int flags, const char *rule)
{
	struct files *fi;
	const char *dotp, *dotp1, *tail, *path, *tail1 = NULL;
	struct nvlist *nv;
	size_t baselen;
	int needc, needf;
	char base[200];

	/* check various errors */
	needc = flags & FI_NEEDSCOUNT;
	needf = flags & FI_NEEDSFLAG;
	if (needc && needf) {
		error("cannot mix needs-count and needs-flag");
		goto bad;
	}
	if (optx == NULL && (needc || needf)) {
		error("nothing to %s", needc ? "count" : "flag");
		goto bad;
	}

	for (nv = nvpath; nv; nv = nv->nv_next) {
		path = nv->nv_name;

		/* find last part of pathname, and same without trailing suffix */
		tail = strrchr(path, '/');
		if (tail == NULL)
			tail = path;
		else
			tail++;
		dotp = strrchr(tail, '.');
		if (dotp == NULL || dotp[1] == 0 ||
		    (baselen = dotp - tail) >= sizeof(base)) {
			error("invalid pathname `%s'", path);
			goto bad;
		}

		/*
		 * Ensure all tailnames are identical, because .o
		 * filenames must be identical too.
		 */
		if (tail1 &&
		    (dotp - tail != dotp1 - tail1 ||
		    strncmp(tail1, tail, dotp - tail)))
			error("different production from %s %s",
			    nvpath->nv_name, tail);
		tail1 = tail;
		dotp1 = dotp;
	}

	/*
	 * Commit this file to memory.  We will decide later whether it
	 * will be used after all.
	 */
	fi = emalloc(sizeof *fi);
	if (ht_insert(pathtab, path, fi)) {
		free(fi);
		if ((fi = ht_lookup(pathtab, path)) == NULL)
			panic("addfile: ht_lookup(%s)", path);
		error("duplicate file %s", path);
		xerror(fi->fi_srcfile, fi->fi_srcline,
		    "here is the original definition");
	}
	memcpy(base, tail, baselen);
	base[baselen] = 0;
	fi->fi_next = NULL;
	fi->fi_srcfile = yyfile;
	fi->fi_srcline = currentline();
	fi->fi_flags = flags;
	fi->fi_nvpath = nvpath;
	fi->fi_base = intern(base);
	fi->fi_optx = optx;
	fi->fi_optf = NULL;
	fi->fi_mkrule = rule;
	*nextfile = fi;
	nextfile = &fi->fi_next;
	return;
bad:
	expr_free(optx);
}

void
addobject(const char *path, struct nvlist *optx, int flags)
{
	struct objects *oi;

	/*
	 * Commit this object to memory.  We will decide later whether it
	 * will be used after all.
	 */
	oi = emalloc(sizeof *oi);
	if (ht_insert(pathtab, path, oi)) {
		free(oi);
		if ((oi = ht_lookup(pathtab, path)) == NULL)
			panic("addfile: ht_lookup(%s)", path);
		error("duplicate file %s", path);
		xerror(oi->oi_srcfile, oi->oi_srcline,
		    "here is the original definition");
	}
	oi->oi_next = NULL;
	oi->oi_srcfile = yyfile;
	oi->oi_srcline = currentline();
	oi->oi_flags = flags;
	oi->oi_path = path;
	oi->oi_optx = optx;
	oi->oi_optf = NULL;
	*nextobject = oi;
	nextobject = &oi->oi_next;
}

/*
 * We have finished reading some "files" file, either ../../conf/files
 * or ./files.$machine.  Make sure that everything that is flagged as
 * needing a count is reasonable.  (This prevents ../../conf/files from
 * depending on some machine-specific device.)
 */
void
checkfiles(void)
{
	struct files *fi, *last;

	last = NULL;
	for (fi = *unchecked; fi != NULL; last = fi, fi = fi->fi_next)
		if ((fi->fi_flags & FI_NEEDSCOUNT) != 0)
			(void)expr_eval(fi->fi_optx, checkaux, fi);
	if (last != NULL)
		unchecked = &last->fi_next;
}

/*
 * Auxiliary function for checkfiles, called from expr_eval.
 * We are not actually interested in the expression's value.
 */
static int
checkaux(const char *name, void *context)
{
	struct files *fi = context;

	if (ht_lookup(devbasetab, name) == NULL) {
		xerror(fi->fi_srcfile, fi->fi_srcline,
		    "`%s' is not a countable device",
		    name);
		/* keep fixfiles() from complaining again */
		fi->fi_flags |= FI_HIDDEN;
	}
	return (0);
}

/*
 * We have finished reading everything.  Tack the files down: calculate
 * selection and counts as needed.  Check that the object files built
 * from the selected sources do not collide.
 */
int
fixfiles(void)
{
	struct files *fi, *ofi;
	struct nvlist *flathead, **flatp;
	int err, sel;

	err = 0;
	for (fi = allfiles; fi != NULL; fi = fi->fi_next) {
		/* Skip files that generated counted-device complaints. */
		if (fi->fi_flags & FI_HIDDEN)
			continue;

		/* Optional: see if it is to be included. */
		if (fi->fi_optx != NULL) {
			flathead = NULL;
			flatp = &flathead;
			sel = expr_eval(fi->fi_optx,
			    fi->fi_flags & FI_NEEDSCOUNT ? fixcount :
			    fi->fi_flags & FI_NEEDSFLAG ? fixfsel :
			    fixsel,
			    &flatp);
			fi->fi_optf = flathead;
			if (!sel)
				continue;
		}

		/* We like this file.  Make sure it generates a unique .o. */
		if (ht_insert(basetab, fi->fi_base, fi)) {
			if ((ofi = ht_lookup(basetab, fi->fi_base)) == NULL)
				panic("fixfiles ht_lookup(%s)", fi->fi_base);
			/*
			 * If the new file comes from a different source,
			 * allow the new one to override the old one.
			 */
			if (fi->fi_nvpath != ofi->fi_nvpath) {
				if (ht_replace(basetab, fi->fi_base, fi) != 1)
					panic("fixfiles ht_replace(%s)",
					    fi->fi_base);
				ofi->fi_flags &= ~FI_SEL;
				ofi->fi_flags |= FI_HIDDEN;
			} else {
				xerror(fi->fi_srcfile, fi->fi_srcline,
				    "object file collision on %s.o, from %s",
				    fi->fi_base, fi->fi_nvpath->nv_name);
				xerror(ofi->fi_srcfile, ofi->fi_srcline,
				    "here is the previous file: %s",
				    ofi->fi_nvpath->nv_name);
				err = 1;
			}
		}
		fi->fi_flags |= FI_SEL;
	}
	return (err);
}

/*
 * We have finished reading everything.  Tack the objects down: calculate
 * selection.
 */
int
fixobjects(void)
{
	struct objects *oi;
	struct nvlist *flathead, **flatp;
	int err, sel;

	err = 0;
	for (oi = allobjects; oi != NULL; oi = oi->oi_next) {
		/* Optional: see if it is to be included. */
		if (oi->oi_optx != NULL) {
			flathead = NULL;
			flatp = &flathead;
			sel = expr_eval(oi->oi_optx,
			    oi->oi_flags & OI_NEEDSFLAG ? fixfsel :
			    fixsel,
			    &flatp);
			oi->oi_optf = flathead;
			if (!sel)
				continue;
		}

		oi->oi_flags |= OI_SEL;
	}
	return (err);
}

/*
 * Called when evaluating a needs-count expression.  Make sure the
 * atom is a countable device.  The expression succeeds iff there
 * is at least one of them (note that while `xx*' will not always
 * set xx's d_umax > 0, you cannot mix '*' and needs-count).  The
 * mkheaders() routine wants a flattened, in-order list of the
 * atoms for `#define name value' lines, so we build that as we
 * are called to eval each atom.
 */
static int
fixcount(const char *name, void *context)
{
	struct nvlist ***p = context;
	struct devbase *dev;
	struct nvlist *nv;

	dev = ht_lookup(devbasetab, name);
	if (dev == NULL)	/* cannot occur here; we checked earlier */
		panic("fixcount(%s)", name);
	nv = newnv(name, NULL, NULL, dev->d_umax, NULL);
	**p = nv;
	*p = &nv->nv_next;
	(void)ht_insert(needcnttab, name, nv);
	return (dev->d_umax != 0);
}

/*
 * Called from fixfiles when eval'ing a selection expression for a
 * file that will generate a .h with flags.  We will need the flat list.
 */
static int
fixfsel(const char *name, void *context)
{
	struct nvlist ***p = context;
	struct nvlist *nv;
	int sel;

	sel = ht_lookup(selecttab, name) != NULL;
	nv = newnv(name, NULL, NULL, sel, NULL);
	**p = nv;
	*p = &nv->nv_next;
	return (sel);
}

/*
 * As for fixfsel above, but we do not need the flat list.
 */
static int
fixsel(const char *name, void *context)
{

	return (ht_lookup(selecttab, name) != NULL);
}

/*
 * Eval an expression tree.  Calls the given function on each node,
 * passing it the given context & the name; return value is &/|/! of
 * results of evaluating atoms.
 *
 * No short circuiting ever occurs.  fn must return 0 or 1 (otherwise
 * our mixing of C's bitwise & boolean here may give surprises).
 */
static int
expr_eval(struct nvlist *expr, int (*fn)(const char *, void *), void *context)
{
	int lhs, rhs;

	switch (expr->nv_int) {

	case FX_ATOM:
		return ((*fn)(expr->nv_name, context));

	case FX_NOT:
		return (!expr_eval(expr->nv_next, fn, context));

	case FX_AND:
		lhs = expr_eval(expr->nv_ptr, fn, context);
		rhs = expr_eval(expr->nv_next, fn, context);
		return (lhs & rhs);

	case FX_OR:
		lhs = expr_eval(expr->nv_ptr, fn, context);
		rhs = expr_eval(expr->nv_next, fn, context);
		return (lhs | rhs);
	}
	panic("expr_eval %d", expr->nv_int);
	return (0);
}

/*
 * Free an expression tree.
 */
static void
expr_free(struct nvlist *expr)
{
	struct nvlist *rhs;

	/* This loop traverses down the RHS of each subexpression. */
	for (; expr != NULL; expr = rhs) {
		switch (expr->nv_int) {

		/* Atoms and !-exprs have no left hand side. */
		case FX_ATOM:
		case FX_NOT:
			break;

		/* For AND and OR nodes, free the LHS. */
		case FX_AND:
		case FX_OR:
			expr_free(expr->nv_ptr);
			break;

		default:
			panic("expr_free %d", expr->nv_int);
		}
		rhs = expr->nv_next;
		nvfree(expr);
	}
}

#ifdef DEBUG
/*
 * Print expression tree.
 */
void
prexpr(struct nvlist *expr)
{
	printf("expr =");
	pr0(expr);
	printf("\n");
	(void)fflush(stdout);
}

static void
pr0(struct nvlist *e)
{

	switch (e->nv_int) {
	case FX_ATOM:
		printf(" %s", e->nv_name);
		return;
	case FX_NOT:
		printf(" (!");
		break;
	case FX_AND:
		printf(" (&");
		break;
	case FX_OR:
		printf(" (|");
		break;
	default:
		printf(" (?%d?", e->nv_int);
		break;
	}
	if (e->nv_ptr)
		pr0(e->nv_ptr);
	pr0(e->nv_next);
	printf(")");
}
#endif