gcc/java/jcf-path.c

   1 /* Handle CLASSPATH, -classpath, and path searching.
   2
   3    Copyright (C) 1998  Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU CC; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.
  19
  20 Java and all Java-based marks are trademarks or registered trademarks
  21 of Sun Microsystems, Inc. in the United States and other countries.
  22 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  23
  24 /* Written by Tom Tromey <tromey@cygnus.com>, October 1998.  */
  25
  26 #include <config.h>
  27 #include "system.h"
  28
  29 #include "jcf.h"
  30
  31 /* Some boilerplate that really belongs in a header.  */
  32
  33 #ifndef GET_ENV_PATH_LIST
  34 #define GET_ENV_PATH_LIST(VAR,NAME)     do { (VAR) = getenv (NAME); } while (0)
  35 #endif
  36
  37 /* By default, colon separates directories in a path.  */
  38 #ifndef PATH_SEPARATOR
  39 #define PATH_SEPARATOR ':'
  40 #endif
  41
  42 #ifndef DIR_SEPARATOR
  43 #define DIR_SEPARATOR '/'
  44 #endif
  45
  46 \f
  47
  48 /* Possible flag values.  */
  49 #define FLAG_SYSTEM 1
  50 #define FLAG_ZIP    2
  51
  52 /* We keep linked lists of directory names.  A ``directory'' can be
  53    either an ordinary directory or a .zip file.  */
  54 struct entry
  55 {
  56   char *name;
  57   int flags;
  58   struct entry *next;
  59 };
  60
  61 /* We support several different ways to set the class path.
  62
  63    built-in system directory (only libjava.zip)
  64    CLASSPATH environment variable
  65    -CLASSPATH overrides CLASSPATH
  66    -classpath option - overrides CLASSPATH, -CLASSPATH, and built-in
  67    -I prepends path to list
  68
  69    We implement this by keeping several path lists, and then simply
  70    ignoring the ones which are not relevant.  */
  71
  72 /* This holds all the -I directories.  */
  73 static struct entry *include_dirs;
  74
  75 /* This holds the CLASSPATH environment variable.  */
  76 static struct entry *classpath_env;
  77
  78 /* This holds the -CLASSPATH command-line option.  */
  79 static struct entry *classpath_u;
  80
  81 /* This holds the -classpath command-line option.  */
  82 static struct entry *classpath_l;
  83
  84 /* This holds the default directories.  Some of these will have the
  85    "system" flag set.  */
  86 static struct entry *sys_dirs;
  87
  88 /* This is the sealed list.  It is just a combination of other lists.  */
  89 static struct entry *sealed;
  90
  91 /* We keep track of the longest path we've seen.  */
  92 static int longest_path = 0;
  93
  94 \f
  95
  96 static void
  97 free_entry (entp)
  98      struct entry **entp;
  99 {
 100   struct entry *e, *n;
 101
 102   for (e = *entp; e; e = n)
 103     {
 104       n = e->next;
 105       free (e->name);
 106       free (e);
 107     }
 108   *entp = NULL;
 109 }
 110
 111 static void
 112 append_entry (entp, ent)
 113      struct entry **entp;
 114      struct entry *ent;
 115 {
 116   /* It doesn't matter if this is slow, since it is run only at
 117      startup, and then infrequently.  */
 118   struct entry *e;
 119
 120   /* Find end of list.  */
 121   for (e = *entp; e && e->next; e = e->next)
 122     ;
 123
 124   if (e)
 125     e->next = ent;
 126   else
 127     *entp = ent;
 128 }
 129
 130 static void
 131 add_entry (entp, filename, is_system)
 132      struct entry **entp;
 133      char *filename;
 134      int is_system;
 135 {
 136   int len;
 137   struct entry *n;
 138
 139   n = (struct entry *) ALLOC (sizeof (struct entry));
 140   n->flags = is_system ? FLAG_SYSTEM : 0;
 141   n->next = NULL;
 142
 143   len = strlen (filename);
 144   if (len > 4 && ! strcmp (filename - 4, ".zip"))
 145     {
 146       n->flags |= FLAG_ZIP;
 147       /* If the user uses -classpath then he'll have to include
 148          libjava.zip in the value.  We check for this in a simplistic
 149          way.  Symlinks will fool this test.  This is only used for
 150          -MM and -MMD, so it probably isn't terribly important.  */
 151       if (! strcmp (filename, LIBJAVA_ZIP_FILE))
 152         n->flags |= FLAG_SYSTEM;
 153     }
 154
 155   if (filename[len - 1] != '/' && filename[len - 1] != DIR_SEPARATOR)
 156     {
 157       char *f2 = (char *) alloca (len + 1);
 158       strcpy (f2, filename);
 159       f2[len] = DIR_SEPARATOR;
 160       f2[len + 1] = '\0';
 161       n->name = strdup (f2);
 162       ++len;
 163     }
 164   else
 165     n->name = strdup (filename);
 166
 167   if (len > longest_path)
 168     longest_path = len;
 169
 170   append_entry (entp, n);
 171 }
 172
 173 static void
 174 add_path (entp, cp, is_system)
 175      struct entry **entp;
 176      char *cp;
 177      int is_system;
 178 {
 179   char *startp, *endp;
 180
 181   if (cp)
 182     {
 183       char *buf = (char *) alloca (strlen (cp) + 3);
 184       startp = endp = cp;
 185       while (1)
 186         {
 187           if (! *endp || *endp == PATH_SEPARATOR)
 188             {
 189               strncpy (buf, startp, endp - startp);
 190               if (endp == startp)
 191                 {
 192                   buf[0] = '.';
 193                   buf[1] = DIR_SEPARATOR;
 194                   buf[2] = '\0';
 195                 }
 196               else if (endp[-1] != '/' && endp[1] != DIR_SEPARATOR)
 197                 {
 198                   buf[endp - startp] = DIR_SEPARATOR;
 199                   buf[endp - startp + 1] = '\0';
 200                 }
 201               else
 202                 buf[endp - startp] = '\0';
 203               add_entry (entp, buf, is_system);
 204               if (! *endp)
 205                 break;
 206               ++endp;
 207               startp = endp;
 208             }
 209           else
 210             ++endp;
 211         }
 212     }
 213 }
 214
 215 /* Initialize the path module.  */
 216 void
 217 jcf_path_init ()
 218 {
 219   char *cp;
 220
 221   add_entry (&sys_dirs, ".", 0);
 222   add_entry (&sys_dirs, LIBJAVA_ZIP_FILE, 1);
 223
 224   GET_ENV_PATH_LIST (cp, "CLASSPATH");
 225   add_path (&classpath_env, cp, 0);
 226 }
 227
 228 /* Call this when -classpath is seen on the command line.  */
 229 void
 230 jcf_path_classpath_arg (path)
 231      char *path;
 232 {
 233   free_entry (&classpath_l);
 234   add_path (&classpath_l, path, 0);
 235 }
 236
 237 /* Call this when -CLASSPATH is seen on the command line.  */
 238 void
 239 jcf_path_CLASSPATH_arg (path)
 240      char *path;
 241 {
 242   free_entry (&classpath_u);
 243   add_path (&classpath_u, path, 0);
 244 }
 245
 246 /* Call this when -I is seen on the command line.  */
 247 void
 248 jcf_path_include_arg (path)
 249      char *path;
 250 {
 251   add_entry (&include_dirs, path, 0);
 252 }
 253
 254 /* We `seal' the path by linking everything into one big list.  Then
 255    we provide a way to iterate through the sealed list.  */
 256 void
 257 jcf_path_seal ()
 258 {
 259   int do_system = 1;
 260   struct entry *secondary;
 261
 262   sealed = include_dirs;
 263   include_dirs = NULL;
 264
 265   if (classpath_l)
 266     {
 267       secondary = classpath_l;
 268       classpath_l = NULL;
 269       do_system = 0;
 270     }
 271   else if (classpath_u)
 272     {
 273       secondary = classpath_u;
 274       classpath_u = NULL;
 275     }
 276   else
 277     {
 278       secondary = classpath_env;
 279       classpath_env = NULL;
 280     }
 281
 282   free_entry (&classpath_l);
 283   free_entry (&classpath_u);
 284   free_entry (&classpath_env);
 285
 286   append_entry (&sealed, secondary);
 287
 288   if (do_system)
 289     {
 290       append_entry (&sealed, sys_dirs);
 291       sys_dirs = NULL;
 292     }
 293   else
 294     free_entry (&sys_dirs);
 295 }
 296
 297 void *
 298 jcf_path_start ()
 299 {
 300   return (void *) sealed;
 301 }
 302
 303 void *
 304 jcf_path_next (x)
 305      void *x;
 306 {
 307   struct entry *ent = (struct entry *) x;
 308   return (void *) ent->next;
 309 }
 310
 311 /* We guarantee that the return path will either be a zip file, or it
 312    will end with a directory separator.  */
 313 char *
 314 jcf_path_name (x)
 315      void *x;
 316 {
 317   struct entry *ent = (struct entry *) x;
 318   return ent->name;
 319 }
 320
 321 int
 322 jcf_path_is_zipfile (x)
 323      void *x;
 324 {
 325   struct entry *ent = (struct entry *) x;
 326   return (ent->flags & FLAG_ZIP);
 327 }
 328
 329 int
 330 jcf_path_is_system (x)
 331      void *x;
 332 {
 333   struct entry *ent = (struct entry *) x;
 334   return (ent->flags & FLAG_SYSTEM);
 335 }
 336
 337 int
 338 jcf_path_max_len ()
 339 {
 340   return longest_path;
 341 }