/* Handle CLASSPATH, -classpath, and path searching.
Copyright (C) 1998-2015 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC 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 for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
.
Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
The Free Software Foundation is independent of Sun Microsystems, Inc. */
/* Written by Tom Tromey , October 1998. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include
#include "jcf.h"
#ifndef DIR_UP
#define DIR_UP ".."
#endif
/* Possible flag values. */
#define FLAG_SYSTEM 1
#define FLAG_ZIP 2
/* We keep linked lists of directory names. A ``directory'' can be
either an ordinary directory or a .zip file. */
struct entry
{
char *name;
int flags;
struct entry *next;
};
static void free_entry (struct entry **);
static void append_entry (struct entry **, struct entry *);
static void add_entry (struct entry **, const char *, int);
static void add_path (struct entry **, const char *, int);
/* We support several different ways to set the class path.
built-in system directory (only libgcj.jar)
CLASSPATH environment variable
-classpath option overrides $CLASSPATH
-CLASSPATH option is a synonym for -classpath (for compatibility)
-bootclasspath overrides built-in
-extdirs sets the extensions directory path (overrides built-in)
-I prepends path to list
We implement this by keeping several path lists, and then simply
ignoring the ones which are not relevant. */
/* This holds all the -I directories. */
static struct entry *include_dirs;
/* This holds the CLASSPATH environment variable. */
static struct entry *classpath_env;
/* This holds the -classpath command-line option. */
static struct entry *classpath_user;
/* This holds the default directories. Some of these will have the
"system" flag set. */
static struct entry *sys_dirs;
/* This holds the extensions path entries. */
static struct entry *extensions;
/* This is the sealed list. It is just a combination of other lists. */
static struct entry *sealed;
/* We keep track of the longest path we've seen. */
static int longest_path = 0;
static void
free_entry (struct entry **entp)
{
struct entry *e, *n;
for (e = *entp; e; e = n)
{
n = e->next;
free (e->name);
free (e);
}
*entp = NULL;
}
static void
append_entry (struct entry **entp, struct entry *ent)
{
/* It doesn't matter if this is slow, since it is run only at
startup, and then infrequently. */
struct entry *e;
/* Find end of list. */
for (e = *entp; e && e->next; e = e->next)
;
if (e)
e->next = ent;
else
*entp = ent;
}
static void
add_entry (struct entry **entp, const char *filename, int is_system)
{
int len;
struct entry *n;
n = XNEW (struct entry);
n->flags = is_system ? FLAG_SYSTEM : 0;
n->next = NULL;
len = strlen (filename);
if (len > 4 && (FILENAME_CMP (filename + len - 4, ".zip") == 0
|| FILENAME_CMP (filename + len - 4, ".jar") == 0))
{
n->flags |= FLAG_ZIP;
/* If the user uses -classpath then he'll have to include
libgcj.jar in the value. We check for this in a simplistic
way. Symlinks will fool this test. This is only used for
-MM and -MMD, so it probably isn't terribly important. */
if (! FILENAME_CMP (filename, LIBGCJ_ZIP_FILE))
n->flags |= FLAG_SYSTEM;
}
/* Note that we add a trailing separator to `.zip' names as well.
This is a little hack that lets the searching code in jcf-io.c
work more easily. Eww. */
if (! IS_DIR_SEPARATOR (filename[len - 1]))
{
char *f2 = (char *) alloca (len + 2);
strcpy (f2, filename);
f2[len] = DIR_SEPARATOR;
f2[len + 1] = '\0';
n->name = xstrdup (f2);
++len;
}
else
n->name = xstrdup (filename);
if (len > longest_path)
longest_path = len;
append_entry (entp, n);
}
static void
add_path (struct entry **entp, const char *cp, int is_system)
{
const char *startp, *endp;
if (cp)
{
char *buf = (char *) alloca (strlen (cp) + 3);
startp = endp = cp;
while (1)
{
if (! *endp || *endp == PATH_SEPARATOR)
{
if (endp == startp)
{
buf[0] = '.';
buf[1] = DIR_SEPARATOR;
buf[2] = '\0';
}
else
{
strncpy (buf, startp, endp - startp);
buf[endp - startp] = '\0';
}
add_entry (entp, buf, is_system);
if (! *endp)
break;
++endp;
startp = endp;
}
else
++endp;
}
}
}
static int init_done = 0;
/* Initialize the path module. */
void
jcf_path_init (void)
{
char *cp;
char *attempt, sep[2];
struct stat stat_b;
int found = 0, len;
if (init_done)
return;
init_done = 1;
sep[0] = DIR_SEPARATOR;
sep[1] = '\0';
cp = getenv ("GCC_EXEC_PREFIX");
if (cp)
{
attempt = (char *) alloca (strlen (cp) + 50);
/* The exec prefix can be something like
/usr/local/bin/../lib/gcc-lib/. We want to change this
into a pointer to the share/java directory. We support two
configurations: one where prefix and exec-prefix are the
same, and one where exec-prefix is `prefix/SOMETHING'. */
strcpy (attempt, cp);
strcat (attempt, DIR_UP);
strcat (attempt, sep);
strcat (attempt, DIR_UP);
strcat (attempt, sep);
len = strlen (attempt);
strcpy (attempt + len, "share");
strcat (attempt, sep);
strcat (attempt, "java");
strcat (attempt, sep);
strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
if (! stat (attempt, &stat_b))
{
add_entry (&sys_dirs, attempt, 1);
found = 1;
strcpy (&attempt[strlen (attempt)
- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
sep);
strcat (attempt, "ext");
strcat (attempt, sep);
if (! stat (attempt, &stat_b))
jcf_path_extdirs_arg (attempt);
}
else
{
strcpy (attempt + len, DIR_UP);
strcat (attempt, sep);
strcat (attempt, "share");
strcat (attempt, sep);
strcat (attempt, "java");
strcat (attempt, sep);
strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
if (! stat (attempt, &stat_b))
{
add_entry (&sys_dirs, attempt, 1);
found = 1;
strcpy (&attempt[strlen (attempt)
- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
sep);
strcat (attempt, "ext");
strcat (attempt, sep);
if (! stat (attempt, &stat_b))
jcf_path_extdirs_arg (attempt);
}
}
}
if (! found)
{
/* Desperation: use the installed one. */
char *extdirs;
add_entry (&sys_dirs, LIBGCJ_ZIP_FILE, 1);
extdirs = (char *) alloca (strlen (LIBGCJ_ZIP_FILE) + 1);
strcpy (extdirs, LIBGCJ_ZIP_FILE);
strcpy (&extdirs[strlen (LIBGCJ_ZIP_FILE)
- strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
"ext");
strcat (extdirs, sep);
if (! stat (extdirs, &stat_b))
jcf_path_extdirs_arg (extdirs);
}
cp = getenv ("CLASSPATH");
add_path (&classpath_env, cp, 0);
}
/* Call this when -classpath is seen on the command line.
This overrides only the $CLASSPATH environment variable.
*/
void
jcf_path_classpath_arg (const char *path)
{
free_entry (&classpath_user);
add_path (&classpath_user, path, 0);
}
/* Call this when -bootclasspath is seen on the command line.
*/
void
jcf_path_bootclasspath_arg (const char *path)
{
free_entry (&sys_dirs);
add_path (&sys_dirs, path, 1);
}
/* Call this when -extdirs is seen on the command line.
*/
void
jcf_path_extdirs_arg (const char *cp)
{
const char *startp, *endp;
free_entry (&extensions);
if (cp)
{
char *buf = (char *) alloca (strlen (cp) + 3);
startp = endp = cp;
while (1)
{
if (! *endp || *endp == PATH_SEPARATOR)
{
if (endp == startp)
return;
strncpy (buf, startp, endp - startp);
buf[endp - startp] = '\0';
{
DIR *dirp = NULL;
int dirname_length = strlen (buf);
dirp = opendir (buf);
if (dirp == NULL)
return;
for (;;)
{
struct dirent *direntp = readdir (dirp);
if (!direntp)
break;
if (direntp->d_name[0] != '.')
{
char *name = (char *) alloca (dirname_length
+ strlen (direntp->d_name) + 2);
strcpy (name, buf);
if (! IS_DIR_SEPARATOR (name[dirname_length-1]))
{
name[dirname_length] = DIR_SEPARATOR;
name[dirname_length+1] = 0;
}
strcat (name, direntp->d_name);
add_entry (&extensions, name, 0);
}
}
if (dirp)
closedir (dirp);
}
if (! *endp)
break;
++endp;
startp = endp;
}
else
++endp;
}
}
}
/* Call this when -I is seen on the command line. */
void
jcf_path_include_arg (const char *path)
{
add_entry (&include_dirs, path, 0);
}
/* We `seal' the path by linking everything into one big list. Then
we provide a way to iterate through the sealed list. If PRINT is
true then we print the final class path to stderr. */
void
jcf_path_seal (int print)
{
struct entry *secondary;
sealed = include_dirs;
include_dirs = NULL;
if (classpath_user)
{
secondary = classpath_user;
classpath_user = NULL;
}
else
{
if (! classpath_env)
add_entry (&classpath_env, ".", 0);
secondary = classpath_env;
classpath_env = NULL;
}
free_entry (&classpath_user);
free_entry (&classpath_env);
append_entry (&sealed, secondary);
append_entry (&sealed, sys_dirs);
append_entry (&sealed, extensions);
sys_dirs = NULL;
extensions = NULL;
if (print)
{
struct entry *ent;
fprintf (stderr, "Class path starts here:\n");
for (ent = sealed; ent; ent = ent->next)
{
fprintf (stderr, " %s", ent->name);
if ((ent->flags & FLAG_SYSTEM))
fprintf (stderr, " (system)");
if ((ent->flags & FLAG_ZIP))
fprintf (stderr, " (zip)");
fprintf (stderr, "\n");
}
}
}
void *
jcf_path_start (void)
{
return (void *) sealed;
}
void *
jcf_path_next (void *x)
{
struct entry *ent = (struct entry *) x;
return (void *) ent->next;
}
static const char
PATH_SEPARATOR_STR[] = {PATH_SEPARATOR, '\0'};
char *
jcf_path_compute (const char *prefix)
{
struct entry *iter;
char *result;
int length = strlen (prefix) + 1;
int first;
for (iter = sealed; iter != NULL; iter = iter->next)
length += strlen (iter->name) + 1;
result = (char *) xmalloc (length);
strcpy (result, prefix);
first = 1;
for (iter = sealed; iter != NULL; iter = iter->next)
{
if (! first)
strcat (result, PATH_SEPARATOR_STR);
first = 0;
strcat (result, iter->name);
/* Ugly: we want to strip the '/' from zip entries when
computing a string classpath. */
if ((iter->flags & FLAG_ZIP) != 0)
result[strlen (result) - 1] = '\0';
}
return result;
}
/* We guarantee that the return path will either be a zip file, or it
will end with a directory separator. */
char *
jcf_path_name (void *x)
{
struct entry *ent = (struct entry *) x;
return ent->name;
}
int
jcf_path_is_zipfile (void *x)
{
struct entry *ent = (struct entry *) x;
return (ent->flags & FLAG_ZIP);
}
int
jcf_path_is_system (void *x)
{
struct entry *ent = (struct entry *) x;
return (ent->flags & FLAG_SYSTEM);
}
int
jcf_path_max_len (void)
{
return longest_path;
}