/* $TOG: include.c /main/21 1998/02/06 11:10:06 kaleb $ */
/*

@OPENGROUP_COPYRIGHT@
COPYRIGHT NOTICE
Copyright (c) 1990, 1991, 1992, 1993 Open Software Foundation, Inc.
Copyright (c) 1996, 1997, 1998, 1999, 2000 The Open Group
ALL RIGHTS RESERVED (MOTIF). See the file named COPYRIGHT.MOTIF for
the full copyright text.
 
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

This software is subject to an open license. It may only be
used on, with or for operating systems which are themselves open
source systems. You must contact The Open Group for a license
allowing distribution and sublicensing of this software on, with,
or for operating systems which are not Open Source programs.

See http://www.opengroup.org/openmotif/license for full
details of the license agreement. Any use, reproduction, or
distribution of the program constitutes recipient's acceptance of
this agreement.

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS
PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT
NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE
EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

*/


#include "def.h"

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

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

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

boolean
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);
}

/*
 * Occasionally, 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!!)
 */
void
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;

	/*
	 * Recursively remove all 'x/..' component pairs.
	 */
	cp = components;
	while(*cp) {
		if (!isdot(*cp) && !isdotdot(*cp) && isdotdot(*(cp+1))
		    && !issymbolic(newpath, *cp))
		{
		    char **fp = cp + 2;
		    char **tp = cp;

		    do 
			*tp++ = *fp; /* move all the pointers down */
		    while (*fp++);
		    if (cp != components)
			cp--;	/* go back and check for nested ".." */
		} else {
		    cp++;
		}
	}
	/*
	 * Concatenate the remaining path elements.
	 */
	cp = components;
	component_copied = FALSE;
	while(*cp) {
		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);
}

/*
 * 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);

	if (incstring == NULL)
		ip->i_incstring = ip->i_file;
	else
		ip->i_incstring = copy(incstring);

	return(ip);
}

void
included_by(ip, newfile)
	register struct inclist	*ip, *newfile;
{
	register int 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);
		ip->i_merged = (boolean *)
		    malloc(sizeof(boolean) * 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_flags & 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_merged = (boolean *)
		    realloc(ip->i_merged, sizeof(boolean) * ip->i_listlen);
	}
	ip->i_list[ ip->i_listlen-1 ] = newfile;
	ip->i_merged[ ip->i_listlen-1 ] = FALSE;
}

void
inc_clean ()
{
	register struct inclist *ip;

	for (ip = inclist; ip < inclistp; ip++) {
		ip->i_flags &= ~MARKED;
	}
}

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_flags & 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);
	}

	/*
	 * If the path was surrounded by "" see if this include file is in the
	 * directory of the file being parsed.
	 */
	if (!found && dot) {
		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);
}