Return to expandchildren.c CVS log

Up to [local] / src / usr.bin / make

GC old code that was originally implemented to facilitate adoption by
other BSDs, which never happened, so make things simpler for further
development.

Ditches config.h entirely since it gets reduced to 2 defines.

okay tb@

/*	$OpenBSD: expandchildren.c,v 1.3 2023/09/04 11:35:11 espie Exp $ */
/*	$NetBSD: suff.c,v 1.13 1996/11/06 17:59:25 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. 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.
 */

/*-
 * expandchildren.c --
 *	Dealing with final children expansion before building stuff
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defines.h"
#include "direxpand.h"
#include "engine.h"
#include "arch.h"
#include "expandchildren.h"
#include "var.h"
#include "targ.h"
#include "lst.h"
#include "gnode.h"
#include "suff.h"

static void ExpandChildren(LstNode, GNode *);
static void ExpandVarChildren(LstNode, GNode *, GNode *);
static void ExpandWildChildren(LstNode, GNode *, GNode *);

void
LinkParent(GNode *cgn, GNode *pgn)
{
	Lst_AtEnd(&cgn->parents, pgn);
	if (!has_been_built(cgn))
		pgn->children_left++;
	else if ( ! (cgn->type & OP_USE)) {
		if (cgn->built_status == REBUILT)
			pgn->child_rebuilt = true;
		(void)Make_TimeStamp(pgn, cgn);
	}
}

static void
ExpandVarChildren(LstNode after, GNode *cgn, GNode *pgn)
{
	GNode *gn;		/* New source 8) */
	char *cp;		/* Expanded value */
	LIST members;


	if (DEBUG(SUFF))
		printf("Expanding \"%s\"...", cgn->name);

	cp = Var_Subst(cgn->name, &pgn->localvars, true);
	if (cp == NULL) {
		printf("Problem substituting in %s", cgn->name);
		printf("\n");
		return;
	}

	Lst_Init(&members);

	if (cgn->type & OP_ARCHV) {
		/*
		 * Node was an archive(member) target, so we want to call
		 * on the Arch module to find the nodes for us, expanding
		 * variables in the parent's context.
		 */
		const char *sacrifice = (const char *)cp;

		(void)Arch_ParseArchive(&sacrifice, &members, &pgn->localvars);
	} else {
		/* Break the result into a vector of strings whose nodes
		 * we can find, then add those nodes to the members list.
		 * Unfortunately, we can't use brk_string because it
		 * doesn't understand about variable specifications with
		 * spaces in them...  */
		const char *start, *cp2;

		for (start = cp; *start == ' ' || *start == '\t'; start++)
			continue;
		for (cp2 = start; *cp2 != '\0';) {
			if (ISSPACE(*cp2)) {
				/* White-space -- terminate element, find the
				 * node, add it, skip any further spaces.  */
				gn = Targ_FindNodei(start, cp2, TARG_CREATE);
				cp2++;
				Lst_AtEnd(&members, gn);
				while (ISSPACE(*cp2))
					cp2++;
				/* Adjust cp2 for increment at start of loop,
				 * but set start to first non-space.  */
				start = cp2;
			} else if (*cp2 == '$')
				/* Start of a variable spec -- contact variable
				 * module to find the end so we can skip over
				 * it.  */
				Var_ParseSkip(&cp2, &pgn->localvars);
			else if (*cp2 == '\\' && cp2[1] != '\0')
				/* Escaped something -- skip over it.  */
				cp2+=2;
			else
				cp2++;
	    }

	    if (cp2 != start) {
		    /* Stuff left over -- add it to the list too.  */
		    gn = Targ_FindNodei(start, cp2, TARG_CREATE);
		    Lst_AtEnd(&members, gn);
	    }
	}
	/* Add all elements of the members list to the parent node.  */
	while ((gn = Lst_DeQueue(&members)) != NULL) {
		if (DEBUG(SUFF))
			printf("%s...", gn->name);
		if (Lst_Member(&pgn->children, gn) == NULL) {
			Lst_Append(&pgn->children, after, gn);
			after = Lst_Adv(after);
			LinkParent(gn, pgn);
		}
	}
	/* Free the result.  */
	free(cp);
	if (DEBUG(SUFF))
		printf("\n");
}

static void
ExpandWildChildren(LstNode after, GNode *cgn, GNode *pgn)
{
	char *cp;	/* Expanded value */

	LIST exp;	/* List of expansions */
	Lst path;	/* Search path along which to expand */

	if (DEBUG(SUFF))
		printf("Wildcard expanding \"%s\"...", cgn->name);

	/* Find a path along which to expand the word: if
	 * the word has a known suffix, use the path for that suffix,
	 * otherwise use the default path. */
	path = find_best_path(cgn->name);

	/* Expand the word along the chosen path. */
	Lst_Init(&exp);
	Dir_Expand(cgn->name, path, &exp);

	/* Fetch next expansion off the list and find its GNode.  */
	while ((cp = Lst_DeQueue(&exp)) != NULL) {
		GNode *gn;		/* New source 8) */
		if (DEBUG(SUFF))
			printf("%s...", cp);
		gn = Targ_FindNode(cp, TARG_CREATE);

		/* If gn isn't already a child of the parent, make it so and
		 * up the parent's count of children to build.  */
		if (Lst_Member(&pgn->children, gn) == NULL) {
			Lst_Append(&pgn->children, after, gn);
			after = Lst_Adv(after);
			LinkParent(gn, pgn);
		}
	}

	if (DEBUG(SUFF))
		printf("\n");
}

/*-
 *-----------------------------------------------------------------------
 * ExpandChildren --
 *	Expand the names of any children of a given node that contain
 *	variable invocations or file wildcards into actual targets.
 *
 * Side Effects:
 *	The expanded node is removed from the parent's list of children,
 *	and the parent's children to build counter is decremented, 
 *      but other nodes may be added.
 *-----------------------------------------------------------------------
 */
static void
ExpandChildren(LstNode ln, /* LstNode of child, so we can replace it */
    GNode *pgn)
{
	GNode	*cgn = Lst_Datum(ln);

	/* First do variable expansion -- this takes precedence over wildcard
	 * expansion. If the result contains wildcards, they'll be gotten to
	 * later since the resulting words are tacked on to the end of the
	 * children list.  */
	if (strchr(cgn->name, '$') != NULL)
		ExpandVarChildren(ln, cgn, pgn);
	else if (Dir_HasWildcards(cgn->name))
		ExpandWildChildren(ln, cgn, pgn);
	else
	    /* Third case: nothing to expand.  */
		return;

	/* Since the source was expanded, remove it from the list of children to
	 * keep it from being processed.  */
	pgn->children_left--;
	Lst_Remove(&pgn->children, ln);
}

void
expand_children_from(GNode *parent, LstNode from)
{
	LstNode np, ln;

	for (ln = from; ln != NULL; ln = np) {
		np = Lst_Adv(ln);
		ExpandChildren(ln, parent);
	}
}