gnu/dist/gettext/gettext-tools/lib/classpath.c

   1 /* Java CLASSPATH handling.
   2    Copyright (C) 2001-2003 Free Software Foundation, Inc.
   3    Written by Bruno Haible <haible@clisp.cons.org>, 2001.
   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 this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 /* Specification.  */
  24 #include "classpath.h"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "xsetenv.h"
  31 #include "xalloc.h"
  32
  33 /* Name of environment variable.  */
  34 #ifndef CLASSPATHVAR
  35 # define CLASSPATHVAR "CLASSPATH"
  36 #endif
  37
  38 /* Separator in PATH like lists of pathnames.  */
  39 #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
  40   /* Win32, OS/2, DOS */
  41 # define PATH_SEPARATOR ';'
  42 #else
  43   /* Unix */
  44 # define PATH_SEPARATOR ':'
  45 #endif
  46
  47 /* Return the new CLASSPATH value.  The given classpaths are prepended to
  48    the current CLASSPATH value.   If use_minimal_classpath, the current
  49    CLASSPATH is ignored.  */
  50 char *
  51 new_classpath (const char * const *classpaths, unsigned int classpaths_count,
  52                bool use_minimal_classpath)
  53 {
  54   const char *old_classpath;
  55   unsigned int length;
  56   unsigned int i;
  57   char *result;
  58   char *p;
  59
  60   old_classpath = (use_minimal_classpath ? NULL : getenv (CLASSPATHVAR));
  61   if (old_classpath == NULL)
  62     old_classpath = "";
  63
  64   length = 0;
  65   for (i = 0; i < classpaths_count; i++)
  66     length += strlen (classpaths[i]) + 1;
  67   length += strlen (old_classpath);
  68   if (classpaths_count > 0 && old_classpath[0] == '\0')
  69     length--;
  70
  71   result = (char *) xmalloc (length + 1);
  72   p = result;
  73   for (i = 0; i < classpaths_count; i++)
  74     {
  75       memcpy (p, classpaths[i], strlen (classpaths[i]));
  76       p += strlen (classpaths[i]);
  77       *p++ = PATH_SEPARATOR;
  78     }
  79   if (old_classpath[0] != '\0')
  80     {
  81       memcpy (p, old_classpath, strlen (old_classpath));
  82       p += strlen (old_classpath);
  83     }
  84   else
  85     {
  86       if (classpaths_count > 0)
  87         p--;
  88     }
  89   *p = '\0';
  90
  91   return result;
  92 }
  93
  94 /* Set CLASSPATH and returns a safe copy of its old value.  */
  95 char *
  96 set_classpath (const char * const *classpaths, unsigned int classpaths_count,
  97                bool use_minimal_classpath, bool verbose)
  98 {
  99   const char *old_CLASSPATH = getenv (CLASSPATHVAR);
 100   char *result = (old_CLASSPATH != NULL ? xstrdup (old_CLASSPATH) : NULL);
 101   char *new_CLASSPATH =
 102     new_classpath (classpaths, classpaths_count, use_minimal_classpath);
 103
 104   if (verbose)
 105     printf (CLASSPATHVAR "=%s ", new_CLASSPATH);
 106
 107   xsetenv (CLASSPATHVAR, new_CLASSPATH, 1);
 108
 109   free (new_CLASSPATH);
 110
 111   return result;
 112 }
 113
 114 /* Restore CLASSPATH to its previous value.  */
 115 void
 116 reset_classpath (char *old_classpath)
 117 {
 118   if (old_classpath != NULL)
 119     {
 120       xsetenv (CLASSPATHVAR, old_classpath, 1);
 121       free (old_classpath);
 122     }
 123   else
 124     unsetenv (CLASSPATHVAR);
 125 }