/* $XConsortium: include.c,v 1.16 94/04/17 20:10:34 gildea Exp $ */

/*
 * Copyright (c) 1998-2003 Carnegie Mellon University.  All rights reserved.
 *
 * 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. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*

Copyright (c) 1993, 1994  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

*/


#include "def.h"

extern struct	inclist	inclist[ MAXFILES ],
			*inclistp;
extern char	*includedirs[ ];
extern char	*notdotdot[ ];
extern boolean show_where_not;
extern boolean warn_multiple;

struct inclist *inc_path(file, include, dot)
	register char	*file,
			*include;
	boolean	dot;
{
	static char	path[ BUFSIZ ];
	register char		**pp, *p;
	register struct inclist	*ip;
	struct stat	st;
	boolean	found = FALSE;

	/*
	 * Check all previously found include files for a path that
	 * has already been expanded.
	 */
	for (ip = inclist; ip->i_file; ip++)
	    if ((strcmp(ip->i_incstring, include) == 0) && !ip->i_included_sym)
	    {
		found = TRUE;
		break;
	    }

	/*
	 * If the path was surrounded by "" or is an absolute path,
	 * then check the exact path provided.
	 */
	if (!found && (dot || *include == '/')) {
		if (stat(include, &st) == 0) {
			ip = newinclude(include, include);
			found = TRUE;
		}
		else if (show_where_not)
			warning1("\tnot in %s\n", include);
	}

	/*
	 * See if this include file is in the directory of the
	 * file being compiled.
	 */
	if (!found) {
		for (p=file+strlen(file); p>file; p--)
			if (*p == '/')
				break;
		if (p == file)
			strcpy(path, include);
		else {
			strncpy(path, file, (p-file) + 1);
			path[ (p-file) + 1 ] = '\0';
			strcpy(path + (p-file) + 1, include);
		}
		remove_dotdot(path);
		if (stat(path, &st) == 0) {
			ip = newinclude(path, include);
			found = TRUE;
		}
		else if (show_where_not)
			warning1("\tnot in %s\n", path);
	}

	/*
	 * Check the include directories specified. (standard include dir
	 * should be at the end.)
	 */
	if (!found)
		for (pp = includedirs; *pp; pp++) {
			sprintf(path, "%s/%s", *pp, include);
			remove_dotdot(path);
			if (stat(path, &st) == 0) {
				ip = newinclude(path, include);
				found = TRUE;
				break;
			}
			else if (show_where_not)
				warning1("\tnot in %s\n", path);
		}

	if (!found)
		ip = NULL;
	return(ip);
}

/*
 * Ocaisionally, pathnames are created that look like ../x/../y
 * Any of the 'x/..' sequences within the name can be eliminated.
 * (but only if 'x' is not a symbolic link!!)
 */
remove_dotdot(path)
	char	*path;
{
	register char	*end, *from, *to, **cp;
	char		*components[ MAXFILES ],
			newpath[ BUFSIZ ];
	boolean		component_copied;

	/*
	 * slice path up into components.
	 */
	to = newpath;
	if (*path == '/')
		*to++ = '/';
	*to = '\0';
	cp = components;
	for (from=end=path; *end; end++)
		if (*end == '/') {
			while (*end == '/')
				*end++ = '\0';
			if (*from)
				*cp++ = from;
			from = end;
		}
	*cp++ = from;
	*cp = NULL;

	/*
	 * Now copy the path, removing all 'x/..' components.
	 */
	cp = components;
	component_copied = FALSE;
	while(*cp) {
		if (!isdot(*cp) && !isdotdot(*cp) && isdotdot(*(cp+1))) {
			if (issymbolic(newpath, *cp))
				goto dont_remove;
			cp++;
		} else {
		dont_remove:
			if (component_copied)
				*to++ = '/';
			component_copied = TRUE;
			for (from = *cp; *from; )
				*to++ = *from++;
			*to = '\0';
		}
		cp++;
	}
	*to++ = '\0';

	/*
	 * copy the reconstituted path back to our pointer.
	 */
	strcpy(path, newpath);
}

isdot(p)
	register char	*p;
{
	if(p && *p++ == '.' && *p++ == '\0')
		return(TRUE);
	return(FALSE);
}

isdotdot(p)
	register char	*p;
{
	if(p && *p++ == '.' && *p++ == '.' && *p++ == '\0')
		return(TRUE);
	return(FALSE);
}

issymbolic(dir, component)
	register char	*dir, *component;
{
#ifdef S_IFLNK
	struct stat	st;
	char	buf[ BUFSIZ ], **pp;

	sprintf(buf, "%s%s%s", dir, *dir ? "/" : "", component);
	for (pp=notdotdot; *pp; pp++)
		if (strcmp(*pp, buf) == 0)
			return (TRUE);
	if (lstat(buf, &st) == 0
	&& (st.st_mode & S_IFMT) == S_IFLNK) {
		*pp++ = copy(buf);
		if (pp >= &notdotdot[ MAXDIRS ])
			fatalerr("out of .. dirs, increase MAXDIRS\n");
		return(TRUE);
	}
#endif
	return(FALSE);
}

/*
 * Add an include file to the list of those included by 'file'.
 */
struct inclist *newinclude(newfile, incstring)
	register char	*newfile, *incstring;
{
	register struct inclist	*ip;

	/*
	 * First, put this file on the global list of include files.
	 */
	ip = inclistp++;
	if (inclistp == inclist + MAXFILES - 1)
		fatalerr("out of space: increase MAXFILES\n");
	ip->i_file = copy(newfile);
	ip->i_included_sym = FALSE;
	if (incstring == NULL)
		ip->i_incstring = ip->i_file;
	else
		ip->i_incstring = copy(incstring);

	return(ip);
}

included_by(ip, newfile)
	register struct inclist	*ip, *newfile;
{
	register i;

	if (ip == NULL)
		return;
	/*
	 * Put this include file (newfile) on the list of files included
	 * by 'file'.  If 'file' is NULL, then it is not an include
	 * file itself (i.e. was probably mentioned on the command line).
	 * If it is already on the list, don't stick it on again.
	 */
	if (ip->i_list == NULL)
		ip->i_list = (struct inclist **)
			malloc(sizeof(struct inclist *) * ++ip->i_listlen);
	else {
		for (i=0; i<ip->i_listlen; i++)
			if (ip->i_list[ i ] == newfile) {
			    i = strlen(newfile->i_file);
			    if (!ip->i_included_sym &&
				!(i > 2 &&
				  newfile->i_file[i-1] == 'c' &&
				  newfile->i_file[i-2] == '.'))
			    {
				/* only bitch if ip has */
				/* no #include SYMBOL lines  */
				/* and is not a .c file */
				if (warn_multiple)
				{
					warning("%s includes %s more than once!\n",
						ip->i_file, newfile->i_file);
					warning1("Already have\n");
					for (i=0; i<ip->i_listlen; i++)
						warning1("\t%s\n", ip->i_list[i]->i_file);
				}
			    }
			    return;
			}
		ip->i_list = (struct inclist **) realloc(ip->i_list,
			sizeof(struct inclist *) * ++ip->i_listlen);
	}
	ip->i_list[ ip->i_listlen-1 ] = newfile;
}

inc_clean ()
{
	register struct inclist *ip;

	for (ip = inclist; ip < inclistp; ip++) {
		ip->i_marked = FALSE;
	}
}