/*

 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * Class-Path Wildcards

 *

 * The syntax for wildcards is a single asterisk. The class path

 * foo/"*", e.g., loads all jar files in the directory named foo.

 * (This requires careful quotation when used in shell scripts.)

 *

 * Only files whose names end in .jar or .JAR are matched.

 * Files whose names end in .zip, or which have a particular

 * magic number, regardless of filename extension, are not

 * matched.

 *

 * Files are considered regardless of whether or not they are

 * "hidden" in the UNIX sense, i.e., have names beginning with '.'.

 *

 * A wildcard only matches jar files, not class files in the same

 * directory.  If you want to load both class files and jar files from

 * a single directory foo then you can say foo:foo/"*", or foo/"*":foo

 * if you want the jar files to take precedence.

 *

 * Subdirectories are not searched recursively, i.e., foo/"*" only

 * looks for jar files in foo, not in foo/bar, foo/baz, etc.

 *

 * Expansion of wildcards is done early, prior to the invocation of a

 * program's main method, rather than late, during the class-loading

 * process itself.  Each element of the input class path containing a

 * wildcard is replaced by the (possibly empty) sequence of elements

 * generated by enumerating the jar files in the named directory.  If

 * the directory foo contains a.jar, b.jar, and c.jar,

 * e.g., then the class path foo/"*" is expanded into

 * foo/a.jar:foo/b.jar:foo/c.jar, and that string would be the value

 * of the system property java.class.path.

 *

 * The order in which the jar files in a directory are enumerated in

 * the expanded class path is not specified and may vary from platform

 * to platform and even from moment to moment on the same machine.  A

 * well-constructed application should not depend upon any particular

 * order.  If a specific order is required then the jar files can be

 * enumerated explicitly in the class path.

 *

 * The CLASSPATH environment variable is not treated any differently

 * from the -classpath (equiv. -cp) command-line option,

 * i.e. wildcards are honored in all these cases.

 *

 * Class-path wildcards are not honored in the Class-Path jar-manifest

 * header.

 *

 * Class-path wildcards are honored not only by the Java launcher but

 * also by most other command-line tools that accept class paths, and

 * in particular by javac and javadoc.

 *

 * Class-path wildcards are not honored in any other kind of path, and

 * especially not in the bootstrap class path, which is a mere

 * artifact of our implementation and not something that developers

 * should use.

 *

 * Classpath wildcards are only expanded in the Java launcher code,

 * supporting the use of wildcards on the command line and in the

 * CLASSPATH environment variable.  We do not support the use of

 * wildcards by applications that embed the JVM.

 */

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include "java.h"       /* Strictly for PATH_SEPARATOR/FILE_SEPARATOR */

#include "jli_util.h"

#ifdef _WIN32

#include <windows.h>

#else /* Unix */

#include <unistd.h>

#include <dirent.h>

#endif /* Unix */

#if defined(_AIX)

  #define DIR DIR64

  #define dirent dirent64

  #define opendir opendir64

  #define readdir readdir64

  #define closedir closedir64

#endif

static int

exists(const char* filename)

{

#ifdef _WIN32

    return _access(filename, 0) == 0;

#else

    return access(filename, F_OK) == 0;

#endif

}

#define NEW_(TYPE) ((TYPE) JLI_MemAlloc(sizeof(struct TYPE##_)))

/*

 * Wildcard directory iteration.

 * WildcardIterator_for(wildcard) returns an iterator.

 * Each call to that iterator's next() method returns the basename

 * of an entry in the wildcard's directory.  The basename's memory

 * belongs to the iterator.  The caller is responsible for prepending

 * the directory name and file separator, if necessary.

 * When done with the iterator, call the close method to clean up.

 */

typedef struct WildcardIterator_* WildcardIterator;

#ifdef _WIN32

struct WildcardIterator_

{

    HANDLE handle;

    char *firstFile; /* Stupid FindFirstFile...FindNextFile */

};

// since this is used repeatedly we keep it here.

static WIN32_FIND_DATA find_data;

static WildcardIterator

WildcardIterator_for(const char *wildcard)

{

    WildcardIterator it = NEW_(WildcardIterator);

    HANDLE handle = FindFirstFile(wildcard, &find_data);

    if (handle == INVALID_HANDLE_VALUE) {

        JLI_MemFree(it);

        return NULL;

    }

    it->handle = handle;

    it->firstFile = find_data.cFileName;

    return it;

}

static char *

WildcardIterator_next(WildcardIterator it)

{

    if (it->firstFile != NULL) {

        char *firstFile = it->firstFile;

        it->firstFile = NULL;

        return firstFile;

    }

    return FindNextFile(it->handle, &find_data)

        ? find_data.cFileName : NULL;

}

static void

WildcardIterator_close(WildcardIterator it)

{

    if (it) {

        FindClose(it->handle);

        JLI_MemFree(it->firstFile);

        JLI_MemFree(it);

    }

}

#else /* Unix */

struct WildcardIterator_

{

    DIR *dir;

};

static WildcardIterator

WildcardIterator_for(const char *wildcard)

{

    DIR *dir;

    int wildlen = JLI_StrLen(wildcard);

    if (wildlen < 2) {

        dir = opendir(".");

    } else {

        char *dirname = JLI_StringDup(wildcard);

        dirname[wildlen - 1] = '\0';

        dir = opendir(dirname);

        JLI_MemFree(dirname);

    }

    if (dir == NULL)

        return NULL;

    else {

        WildcardIterator it = NEW_(WildcardIterator);

        it->dir = dir;

        return it;

    }

}

static char *

WildcardIterator_next(WildcardIterator it)

{

    struct dirent* dirp = readdir(it->dir);

    return dirp ? dirp->d_name : NULL;

}

static void

WildcardIterator_close(WildcardIterator it)

{

    if (it) {

        closedir(it->dir);

        JLI_MemFree(it);

    }

}

#endif /* Unix */

static int

equal(const char *s1, const char *s2)

{

    return JLI_StrCmp(s1, s2) == 0;

}

static int

isJarFileName(const char *filename)

{

    int len = (int)JLI_StrLen(filename);

    return (len >= 4) &&

        (filename[len - 4] == '.') &&

        (equal(filename + len - 3, "jar") ||

         equal(filename + len - 3, "JAR")) &&

        /* Paranoia: Maybe filename is "DIR:foo.jar" */

        (JLI_StrChr(filename, PATH_SEPARATOR) == NULL);

}

static char *

wildcardConcat(const char *wildcard, const char *basename)

{

    int wildlen = (int)JLI_StrLen(wildcard);

    int baselen = (int)JLI_StrLen(basename);

    char *filename = (char *) JLI_MemAlloc(wildlen + baselen);

    /* Replace the trailing '*' with basename */

    memcpy(filename, wildcard, wildlen-1);

    memcpy(filename+wildlen-1, basename, baselen+1);

    return filename;

}

static JLI_List

wildcardFileList(const char *wildcard)

{

    const char *basename;

    JLI_List fl = JLI_List_new(16);

    WildcardIterator it = WildcardIterator_for(wildcard);

    if (it == NULL)

    {

        JLI_List_free(fl);

        return NULL;

    }

    while ((basename = WildcardIterator_next(it)) != NULL)

        if (isJarFileName(basename))

            JLI_List_add(fl, wildcardConcat(wildcard, basename));

    WildcardIterator_close(it);

    return fl;

}

static int

isWildcard(const char *filename)

{

    int len = (int)JLI_StrLen(filename);

    return (len > 0) &&

        (filename[len - 1] == '*') &&

        (len == 1 || IS_FILE_SEPARATOR(filename[len - 2])) &&

        (! exists(filename));

}

static int

FileList_expandWildcards(JLI_List fl)

{

    size_t i, j;

    int expandedCnt = 0;

    for (i = 0; i < fl->size; i++) {

        if (isWildcard(fl->elements[i])) {

            JLI_List expanded = wildcardFileList(fl->elements[i]);

            if (expanded != NULL && expanded->size > 0) {

                expandedCnt++;

                JLI_MemFree(fl->elements[i]);

                JLI_List_ensureCapacity(fl, fl->size + expanded->size);

                for (j = fl->size - 1; j >= i+1; j--)

                    fl->elements[j+expanded->size-1] = fl->elements[j];

                for (j = 0; j < expanded->size; j++)

                    fl->elements[i+j] = expanded->elements[j];

                i += expanded->size - 1;

                fl->size += expanded->size - 1;

                /* fl expropriates expanded's elements. */

                expanded->size = 0;

            }

            JLI_List_free(expanded);

        }

    }

    return expandedCnt;

}

const char *

JLI_WildcardExpandClasspath(const char *classpath)

{

    const char *expanded;

    JLI_List fl;

    if (JLI_StrChr(classpath, '*') == NULL)

        return classpath;

    fl = JLI_List_split(classpath, PATH_SEPARATOR);

    expanded = FileList_expandWildcards(fl) ?

        JLI_List_join(fl, PATH_SEPARATOR) : classpath;

    JLI_List_free(fl);

    if (getenv(JLDEBUG_ENV_ENTRY) != 0)

        printf("Expanded wildcards:\n"

               "    before: \"%s\"\n"

               "    after : \"%s\"\n",

               classpath, expanded);

    return expanded;

}

#ifdef DEBUG_WILDCARD

static void

FileList_print(JLI_List fl)

{

    size_t i;

    putchar('[');

    for (i = 0; i < fl->size; i++) {

        if (i > 0) printf(", ");

        printf("\"%s\"",fl->elements[i]);

    }

    putchar(']');

}

static void

wildcardExpandArgv(const char ***argv)

{

    int i;

    for (i = 0; (*argv)[i]; i++) {

        if (equal((*argv)[i], "-cp") ||

            equal((*argv)[i], "-classpath")) {

            i++;

            (*argv)[i] = wildcardExpandClasspath((*argv)[i]);

        }

    }

}

static void

debugPrintArgv(char *argv[])

{

    int i;

    putchar('[');

    for (i = 0; argv[i]; i++) {

        if (i > 0) printf(", ");

        printf("\"%s\"", argv[i]);

    }

    printf("]\n");

}

int

main(int argc, char *argv[])

{

    argv[0] = "java";

    wildcardExpandArgv((const char***)&argv);

    debugPrintArgv(argv);

    /* execvp("java", argv); */

    return 0;

}

#endif /* DEBUG_WILDCARD */

/* Cute little perl prototype implementation....

my $sep = ($^O =~ /^(Windows|cygwin)/) ? ";" : ":";

sub expand($) {

  opendir DIR, $_[0] or return $_[0];

  join $sep, map {"$_[0]/$_"} grep {/\.(jar|JAR)$/} readdir DIR;

}

sub munge($) {

  join $sep,

    map {(! -r $_ and s/[\/\\]+\*$//) ? expand $_ : $_} split $sep, $_[0];

}

for (my $i = 0; $i < @ARGV - 1; $i++) {

  $ARGV[$i+1] = munge $ARGV[$i+1] if $ARGV[$i] =~ /^-c(p|lasspath)$/;

}

$ENV{CLASSPATH} = munge $ENV{CLASSPATH} if exists $ENV{CLASSPATH};

@ARGV = ("java", @ARGV);

print "@ARGV\n";

exec @ARGV;

*/