/* $TOG: lndir.c /main/17 1998/02/06 11:23:50 kaleb $ */
/* Create shadow link tree (after X11R4 script of the same name)
   Mark Reinhold (mbr@lcs.mit.edu)/3 January 1990 */

/* 

 * Motif
 *
 * Copyright (c) 1987-2012, The Open Group. All rights reserved.
 *
 * These libraries and programs are free software; you can
 * redistribute them and/or modify them under the terms of the GNU
 * Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * These libraries and programs are distributed in the hope that
 * they will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with these librararies and programs; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301 USA

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif


/* From the original /bin/sh script:

  Used to create a copy of the a directory tree that has links for all
  non-directories (except those named RCS, SCCS or CVS.adm).  If you are
  building the distribution on more than one machine, you should use
  this technique.

  If your master sources are located in /usr/local/src/X and you would like
  your link tree to be in /usr/local/src/new-X, do the following:

   	%  mkdir /usr/local/src/new-X
	%  cd /usr/local/src/new-X
   	%  lndir ../X
*/

#include <X11/Xos.h>
#include <X11/Xfuncproto.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <errno.h>

#ifndef X_NOT_POSIX
#include <dirent.h>
#else
#ifdef SYSV
#include <dirent.h>
#else
#ifdef USG
#include <dirent.h>
#else
#include <sys/dir.h>
#ifndef dirent
#define dirent direct
#endif
#endif
#endif
#endif
#ifndef MAXPATHLEN
#define MAXPATHLEN 2048
#endif

#if NeedVarargsPrototypes
#include <stdarg.h>
#endif

#ifdef X_NOT_STDC_ENV
extern int errno;
#endif
int silent = 0;			/* -silent */
int ignore_links = 0;		/* -ignorelinks */

char *rcurdir;
char *curdir;

void
quit (
#if NeedVarargsPrototypes
    int code, char * fmt, ...)
#else
    code, fmt, a1, a2, a3)
    char *fmt;
#endif
{
#if NeedVarargsPrototypes
    va_list args;
    va_start(args, fmt);
    vfprintf (stderr, fmt, args);
    va_end(args);
#else
    fprintf (stderr, fmt, a1, a2, a3);
#endif
    putc ('\n', stderr);
    exit (code);
}

void
quiterr (code, s)
    char *s;
{
    perror (s);
    exit (code);
}

void
msg (
#if NeedVarargsPrototypes
    char * fmt, ...)
#else
    fmt, a1, a2, a3)
    char *fmt;
#endif
{
#if NeedVarargsPrototypes
    va_list args;
#endif
    if (curdir) {
	fprintf (stderr, "%s:\n", curdir);
	curdir = 0;
    }
#if NeedVarargsPrototypes
    va_start(args, fmt);
    vfprintf (stderr, fmt, args);
    va_end(args);
#else
    fprintf (stderr, fmt, a1, a2, a3);
#endif
    putc ('\n', stderr);
}

void
mperror (s)
    char *s;
{
    if (curdir) {
	fprintf (stderr, "%s:\n", curdir);
	curdir = 0;
    }
    perror (s);
}


int equivalent(lname, rname)
    char *lname;
    char *rname;
{
    char *s;

    if (!strcmp(lname, rname))
	return 1;
    for (s = lname; *s && (s = strchr(s, '/')); s++) {
	while (s[1] == '/')
	    strcpy(s+1, s+2);
    }
    return !strcmp(lname, rname);
}


/* Recursively create symbolic links from the current directory to the "from"
   directory.  Assumes that files described by fs and ts are directories. */

dodir (fn, fs, ts, rel)
char *fn;			/* name of "from" directory, either absolute or
				   relative to cwd */
struct stat *fs, *ts;		/* stats for the "from" directory and cwd */
int rel;			/* if true, prepend "../" to fn before using */
{
    DIR *df;
    struct dirent *dp;
    char buf[MAXPATHLEN + 1], *p;
    char symbuf[MAXPATHLEN + 1];
    char basesym[MAXPATHLEN + 1];
    struct stat sb, sc;
    int n_dirs;
    int symlen;
    int basesymlen = -1;
    char *ocurdir;

    if ((fs->st_dev == ts->st_dev) && (fs->st_ino == ts->st_ino)) {
	msg ("%s: From and to directories are identical!", fn);
	return 1;
    }

    if (rel)
	strcpy (buf, "../");
    else
	buf[0] = '\0';
    strcat (buf, fn);
    
    if (!(df = opendir (buf))) {
	msg ("%s: Cannot opendir", buf);
	return 1;
    }

    p = buf + strlen (buf);
    *p++ = '/';
    n_dirs = fs->st_nlink;
    while (dp = readdir (df)) {
	if (dp->d_name[strlen(dp->d_name) - 1] == '~')
	    continue;
	strcpy (p, dp->d_name);

	if (n_dirs > 0) {
	    if (stat (buf, &sb) < 0) {
		mperror (buf);
		continue;
	    }

#ifdef S_ISDIR
	    if(S_ISDIR(sb.st_mode))
#else
	    if (sb.st_mode & S_IFDIR) 
#endif
	    {
		/* directory */
		n_dirs--;
		if (dp->d_name[0] == '.' &&
		    (dp->d_name[1] == '\0' || (dp->d_name[1] == '.' &&
					       dp->d_name[2] == '\0')))
		    continue;
		if (!strcmp (dp->d_name, "RCS"))
		    continue;
		if (!strcmp (dp->d_name, "SCCS"))
		    continue;
		if (!strcmp (dp->d_name, "CVS"))
		    continue;
		if (!strcmp (dp->d_name, "CVS.adm"))
		    continue;
		ocurdir = rcurdir;
		rcurdir = buf;
		curdir = silent ? buf : (char *)0;
		if (!silent)
		    printf ("%s:\n", buf);
		if ((stat (dp->d_name, &sc) < 0) && (errno == ENOENT)) {
		    if (mkdir (dp->d_name, 0777) < 0 ||
			stat (dp->d_name, &sc) < 0) {
			mperror (dp->d_name);
			curdir = rcurdir = ocurdir;
			continue;
		    }
		}
		if (readlink (dp->d_name, symbuf, sizeof(symbuf) - 1) >= 0) {
		    msg ("%s: is a link instead of a directory", dp->d_name);
		    curdir = rcurdir = ocurdir;
		    continue;
		}
		if (chdir (dp->d_name) < 0) {
		    mperror (dp->d_name);
		    curdir = rcurdir = ocurdir;
		    continue;
		}
		dodir (buf, &sb, &sc, (buf[0] != '/'));
		if (chdir ("..") < 0)
		    quiterr (1, "..");
		curdir = rcurdir = ocurdir;
		continue;
	    }
	}

	/* non-directory */
	symlen = readlink (dp->d_name, symbuf, sizeof(symbuf) - 1);
	if (symlen >= 0)
	    symbuf[symlen] = '\0';

	/* The option to ignore links exists mostly because
	   checking for them slows us down by 10-20%.
	   But it is off by default because this really is a useful check. */
	if (!ignore_links) {
	    /* see if the file in the base tree was a symlink */
	    basesymlen = readlink(buf, basesym, sizeof(basesym) - 1);
	    if (basesymlen >= 0)
		basesym[basesymlen] = '\0';
	}

	if (symlen >= 0) {
	    /* Link exists in new tree.  Print message if it doesn't match. */
	    if (!equivalent (basesymlen>=0 ? basesym : buf, symbuf))
		msg ("%s: %s", dp->d_name, symbuf);
	} else {
	    if (symlink (basesymlen>=0 ? basesym : buf, dp->d_name) < 0)
		mperror (dp->d_name);
	}
    }

    closedir (df);
    return 0;
}


main (ac, av)
int ac;
char **av;
{
    char *prog_name = av[0];
    char *fn, *tn;
    struct stat fs, ts;

    while (++av, --ac) {
	if (strcmp(*av, "-silent") == 0)
	    silent = 1;
	else if (strcmp(*av, "-ignorelinks") == 0)
	    ignore_links = 1;
	else if (strcmp(*av, "--") == 0) {
	    ++av, --ac;
	    break;
	}
	else
	    break;
    }

    if (ac < 1 || ac > 2)
	quit (1, "usage: %s [-silent] [-ignorelinks] fromdir [todir]",
	      prog_name);

    fn = av[0];
    if (ac == 2)
	tn = av[1];
    else
	tn = ".";

    /* to directory */
    if (stat (tn, &ts) < 0)
	quiterr (1, tn);
#ifdef S_ISDIR
    if (!(S_ISDIR(ts.st_mode)))
#else
    if (!(ts.st_mode & S_IFDIR))
#endif
	quit (2, "%s: Not a directory", tn);
    if (chdir (tn) < 0)
	quiterr (1, tn);

    /* from directory */
    if (stat (fn, &fs) < 0)
	quiterr (1, fn);
#ifdef S_ISDIR
    if (!(S_ISDIR(fs.st_mode)))
#else
    if (!(fs.st_mode & S_IFDIR))
#endif
	quit (2, "%s: Not a directory", fn);

    exit (dodir (fn, &fs, &ts, 0));
}