519 lines
12 KiB
C
519 lines
12 KiB
C
/* Handle CLASSPATH, -classpath, and path searching.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006,
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2007, 2008 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>.
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Java and all Java-based marks are trademarks or registered trademarks
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of Sun Microsystems, Inc. in the United States and other countries.
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The Free Software Foundation is independent of Sun Microsystems, Inc. */
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/* Written by Tom Tromey <tromey@cygnus.com>, October 1998. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include <dirent.h>
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#include "jcf.h"
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#ifndef DIR_UP
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#define DIR_UP ".."
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#endif
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/* Possible flag values. */
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#define FLAG_SYSTEM 1
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#define FLAG_ZIP 2
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/* We keep linked lists of directory names. A ``directory'' can be
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either an ordinary directory or a .zip file. */
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struct entry
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{
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char *name;
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int flags;
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struct entry *next;
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};
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static void free_entry (struct entry **);
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static void append_entry (struct entry **, struct entry *);
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static void add_entry (struct entry **, const char *, int);
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static void add_path (struct entry **, const char *, int);
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/* We support several different ways to set the class path.
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built-in system directory (only libgcj.jar)
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CLASSPATH environment variable
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-classpath option overrides $CLASSPATH
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-CLASSPATH option is a synonym for -classpath (for compatibility)
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-bootclasspath overrides built-in
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-extdirs sets the extensions directory path (overrides built-in)
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-I prepends path to list
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We implement this by keeping several path lists, and then simply
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ignoring the ones which are not relevant. */
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/* This holds all the -I directories. */
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static struct entry *include_dirs;
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/* This holds the CLASSPATH environment variable. */
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static struct entry *classpath_env;
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/* This holds the -classpath command-line option. */
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static struct entry *classpath_user;
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/* This holds the default directories. Some of these will have the
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"system" flag set. */
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static struct entry *sys_dirs;
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/* This holds the extensions path entries. */
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static struct entry *extensions;
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/* This is the sealed list. It is just a combination of other lists. */
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static struct entry *sealed;
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/* We keep track of the longest path we've seen. */
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static int longest_path = 0;
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static void
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free_entry (struct entry **entp)
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{
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struct entry *e, *n;
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for (e = *entp; e; e = n)
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{
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n = e->next;
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free (e->name);
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free (e);
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}
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*entp = NULL;
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}
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static void
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append_entry (struct entry **entp, struct entry *ent)
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{
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/* It doesn't matter if this is slow, since it is run only at
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startup, and then infrequently. */
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struct entry *e;
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/* Find end of list. */
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for (e = *entp; e && e->next; e = e->next)
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;
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if (e)
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e->next = ent;
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else
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*entp = ent;
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}
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static void
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add_entry (struct entry **entp, const char *filename, int is_system)
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{
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int len;
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struct entry *n;
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n = XNEW (struct entry);
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n->flags = is_system ? FLAG_SYSTEM : 0;
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n->next = NULL;
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len = strlen (filename);
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if (len > 4 && (FILENAME_CMP (filename + len - 4, ".zip") == 0
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|| FILENAME_CMP (filename + len - 4, ".jar") == 0))
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{
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n->flags |= FLAG_ZIP;
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/* If the user uses -classpath then he'll have to include
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libgcj.jar in the value. We check for this in a simplistic
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way. Symlinks will fool this test. This is only used for
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-MM and -MMD, so it probably isn't terribly important. */
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if (! FILENAME_CMP (filename, LIBGCJ_ZIP_FILE))
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n->flags |= FLAG_SYSTEM;
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}
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/* Note that we add a trailing separator to `.zip' names as well.
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This is a little hack that lets the searching code in jcf-io.c
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work more easily. Eww. */
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if (! IS_DIR_SEPARATOR (filename[len - 1]))
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{
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char *f2 = (char *) alloca (len + 2);
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strcpy (f2, filename);
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f2[len] = DIR_SEPARATOR;
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f2[len + 1] = '\0';
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n->name = xstrdup (f2);
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++len;
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}
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else
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n->name = xstrdup (filename);
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if (len > longest_path)
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longest_path = len;
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append_entry (entp, n);
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}
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static void
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add_path (struct entry **entp, const char *cp, int is_system)
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{
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const char *startp, *endp;
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if (cp)
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{
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char *buf = (char *) alloca (strlen (cp) + 3);
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startp = endp = cp;
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while (1)
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{
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if (! *endp || *endp == PATH_SEPARATOR)
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{
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if (endp == startp)
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{
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buf[0] = '.';
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buf[1] = DIR_SEPARATOR;
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buf[2] = '\0';
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}
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else
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{
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strncpy (buf, startp, endp - startp);
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buf[endp - startp] = '\0';
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}
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add_entry (entp, buf, is_system);
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if (! *endp)
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break;
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++endp;
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startp = endp;
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}
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else
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++endp;
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}
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}
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}
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static int init_done = 0;
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/* Initialize the path module. */
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void
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jcf_path_init (void)
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{
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char *cp;
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char *attempt, sep[2];
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struct stat stat_b;
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int found = 0, len;
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if (init_done)
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return;
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init_done = 1;
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sep[0] = DIR_SEPARATOR;
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sep[1] = '\0';
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GET_ENVIRONMENT (cp, "GCC_EXEC_PREFIX");
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if (cp)
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{
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attempt = (char *) alloca (strlen (cp) + 50);
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/* The exec prefix can be something like
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/usr/local/bin/../lib/gcc-lib/. We want to change this
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into a pointer to the share/java directory. We support two
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configurations: one where prefix and exec-prefix are the
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same, and one where exec-prefix is `prefix/SOMETHING'. */
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strcpy (attempt, cp);
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strcat (attempt, DIR_UP);
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strcat (attempt, sep);
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strcat (attempt, DIR_UP);
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strcat (attempt, sep);
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len = strlen (attempt);
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strcpy (attempt + len, "share");
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strcat (attempt, sep);
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strcat (attempt, "java");
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strcat (attempt, sep);
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strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
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if (! stat (attempt, &stat_b))
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{
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add_entry (&sys_dirs, attempt, 1);
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found = 1;
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strcpy (&attempt[strlen (attempt)
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- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
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sep);
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strcat (attempt, "ext");
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strcat (attempt, sep);
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if (! stat (attempt, &stat_b))
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jcf_path_extdirs_arg (attempt);
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}
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else
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{
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strcpy (attempt + len, DIR_UP);
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strcat (attempt, sep);
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strcat (attempt, "share");
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strcat (attempt, sep);
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strcat (attempt, "java");
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strcat (attempt, sep);
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strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
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if (! stat (attempt, &stat_b))
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{
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add_entry (&sys_dirs, attempt, 1);
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found = 1;
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strcpy (&attempt[strlen (attempt)
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- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
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sep);
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strcat (attempt, "ext");
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strcat (attempt, sep);
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if (! stat (attempt, &stat_b))
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jcf_path_extdirs_arg (attempt);
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}
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}
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}
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if (! found)
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{
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/* Desperation: use the installed one. */
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char *extdirs;
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add_entry (&sys_dirs, LIBGCJ_ZIP_FILE, 1);
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extdirs = (char *) alloca (strlen (LIBGCJ_ZIP_FILE) + 1);
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strcpy (extdirs, LIBGCJ_ZIP_FILE);
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strcpy (&extdirs[strlen (LIBGCJ_ZIP_FILE)
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- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
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"ext");
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strcat (extdirs, sep);
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if (! stat (extdirs, &stat_b))
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jcf_path_extdirs_arg (extdirs);
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}
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GET_ENVIRONMENT (cp, "CLASSPATH");
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add_path (&classpath_env, cp, 0);
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}
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/* Call this when -classpath is seen on the command line.
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This overrides only the $CLASSPATH environment variable.
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*/
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void
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jcf_path_classpath_arg (const char *path)
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{
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free_entry (&classpath_user);
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add_path (&classpath_user, path, 0);
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}
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/* Call this when -bootclasspath is seen on the command line.
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*/
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void
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jcf_path_bootclasspath_arg (const char *path)
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{
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free_entry (&sys_dirs);
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add_path (&sys_dirs, path, 1);
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}
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/* Call this when -extdirs is seen on the command line.
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*/
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void
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jcf_path_extdirs_arg (const char *cp)
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{
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const char *startp, *endp;
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free_entry (&extensions);
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if (cp)
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{
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char *buf = (char *) alloca (strlen (cp) + 3);
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startp = endp = cp;
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while (1)
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{
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if (! *endp || *endp == PATH_SEPARATOR)
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{
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if (endp == startp)
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return;
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strncpy (buf, startp, endp - startp);
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buf[endp - startp] = '\0';
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{
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DIR *dirp = NULL;
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int dirname_length = strlen (buf);
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dirp = opendir (buf);
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if (dirp == NULL)
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return;
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for (;;)
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{
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struct dirent *direntp = readdir (dirp);
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if (!direntp)
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break;
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if (direntp->d_name[0] != '.')
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{
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char *name = (char *) alloca (dirname_length
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+ strlen (direntp->d_name) + 2);
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strcpy (name, buf);
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if (! IS_DIR_SEPARATOR (name[dirname_length-1]))
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{
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name[dirname_length] = DIR_SEPARATOR;
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name[dirname_length+1] = 0;
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}
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strcat (name, direntp->d_name);
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add_entry (&extensions, name, 0);
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}
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}
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if (dirp)
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closedir (dirp);
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}
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if (! *endp)
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break;
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++endp;
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startp = endp;
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}
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else
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++endp;
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}
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}
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}
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/* Call this when -I is seen on the command line. */
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void
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jcf_path_include_arg (const char *path)
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{
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add_entry (&include_dirs, path, 0);
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}
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/* We `seal' the path by linking everything into one big list. Then
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we provide a way to iterate through the sealed list. If PRINT is
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true then we print the final class path to stderr. */
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void
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jcf_path_seal (int print)
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{
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struct entry *secondary;
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sealed = include_dirs;
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include_dirs = NULL;
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if (classpath_user)
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{
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secondary = classpath_user;
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classpath_user = NULL;
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}
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else
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{
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if (! classpath_env)
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add_entry (&classpath_env, ".", 0);
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secondary = classpath_env;
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classpath_env = NULL;
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}
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free_entry (&classpath_user);
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free_entry (&classpath_env);
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append_entry (&sealed, secondary);
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append_entry (&sealed, sys_dirs);
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append_entry (&sealed, extensions);
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sys_dirs = NULL;
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extensions = NULL;
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if (print)
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{
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struct entry *ent;
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fprintf (stderr, "Class path starts here:\n");
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for (ent = sealed; ent; ent = ent->next)
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{
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fprintf (stderr, " %s", ent->name);
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if ((ent->flags & FLAG_SYSTEM))
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fprintf (stderr, " (system)");
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if ((ent->flags & FLAG_ZIP))
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fprintf (stderr, " (zip)");
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fprintf (stderr, "\n");
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}
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}
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}
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void *
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jcf_path_start (void)
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{
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return (void *) sealed;
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}
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void *
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jcf_path_next (void *x)
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{
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struct entry *ent = (struct entry *) x;
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return (void *) ent->next;
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}
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static const char
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PATH_SEPARATOR_STR[] = {PATH_SEPARATOR, '\0'};
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char *
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jcf_path_compute (const char *prefix)
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{
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struct entry *iter;
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char *result;
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int length = strlen (prefix) + 1;
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int first;
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for (iter = sealed; iter != NULL; iter = iter->next)
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length += strlen (iter->name) + 1;
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result = (char *) xmalloc (length);
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strcpy (result, prefix);
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first = 1;
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for (iter = sealed; iter != NULL; iter = iter->next)
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{
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if (! first)
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strcat (result, PATH_SEPARATOR_STR);
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first = 0;
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strcat (result, iter->name);
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/* Ugly: we want to strip the '/' from zip entries when
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computing a string classpath. */
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if ((iter->flags & FLAG_ZIP) != 0)
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result[strlen (result) - 1] = '\0';
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}
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return result;
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}
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/* We guarantee that the return path will either be a zip file, or it
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will end with a directory separator. */
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char *
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jcf_path_name (void *x)
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{
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struct entry *ent = (struct entry *) x;
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return ent->name;
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}
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int
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jcf_path_is_zipfile (void *x)
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{
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struct entry *ent = (struct entry *) x;
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return (ent->flags & FLAG_ZIP);
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}
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int
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jcf_path_is_system (void *x)
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{
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struct entry *ent = (struct entry *) x;
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return (ent->flags & FLAG_SYSTEM);
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}
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int
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jcf_path_max_len (void)
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{
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return longest_path;
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}
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