Initial revision

From-SVN: r19445

gcc/intl/dcgettext.c

+/* Implementation of the dcgettext(3) function.
+   Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+
+   This program 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 2, or (at your option)
+   any later version.
+
+   This program 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 this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#ifdef __GNUC__
+# define alloca __builtin_alloca
+# define HAVE_ALLOCA 1
+#else
+# if defined HAVE_ALLOCA_H || defined _LIBC
+#  include <alloca.h>
+# else
+#  ifdef _AIX
+ #pragma alloca
+#  else
+#   ifndef alloca
+char *alloca ();
+#   endif
+#  endif
+# endif
+#endif
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+#ifndef __set_errno
+# define __set_errno(val) errno = (val)
+#endif
+
+#if defined STDC_HEADERS || defined _LIBC
+# include <stdlib.h>
+#else
+char *getenv ();
+# ifdef HAVE_MALLOC_H
+#  include <malloc.h>
+# else
+void free ();
+# endif
+#endif
+
+#if defined HAVE_STRING_H || defined _LIBC
+# ifndef _GNU_SOURCE
+#  define _GNU_SOURCE	1
+# endif
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+#if !HAVE_STRCHR && !defined _LIBC
+# ifndef strchr
+#  define strchr index
+# endif
+#endif
+
+#if defined HAVE_UNISTD_H || defined _LIBC
+# include <unistd.h>
+#endif
+
+#include "gettext.h"
+#include "gettextP.h"
+#ifdef _LIBC
+# include <libintl.h>
+#else
+# include "libgettext.h"
+#endif
+#include "hash-string.h"
+
+/* @@ end of prolog @@ */
+
+#ifdef _LIBC
+/* Rename the non ANSI C functions.  This is required by the standard
+   because some ANSI C functions will require linking with this object
+   file and the name space must not be polluted.  */
+# define getcwd __getcwd
+# ifndef stpcpy
+#  define stpcpy __stpcpy
+# endif
+#else
+# if !defined HAVE_GETCWD
+char *getwd ();
+#  define getcwd(buf, max) getwd (buf)
+# else
+char *getcwd ();
+# endif
+# ifndef HAVE_STPCPY
+static char *stpcpy PARAMS ((char *dest, const char *src));
+# endif
+#endif
+
+/* Amount to increase buffer size by in each try.  */
+#define PATH_INCR 32
+
+/* The following is from pathmax.h.  */
+/* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
+   PATH_MAX but might cause redefinition warnings when sys/param.h is
+   later included (as on MORE/BSD 4.3).  */
+#if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
+# include <limits.h>
+#endif
+
+#ifndef _POSIX_PATH_MAX
+# define _POSIX_PATH_MAX 255
+#endif
+
+#if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
+# define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
+#endif
+
+/* Don't include sys/param.h if it already has been.  */
+#if defined(HAVE_SYS_PARAM_H) && !defined(PATH_MAX) && !defined(MAXPATHLEN)
+# include <sys/param.h>
+#endif
+
+#if !defined(PATH_MAX) && defined(MAXPATHLEN)
+# define PATH_MAX MAXPATHLEN
+#endif
+
+#ifndef PATH_MAX
+# define PATH_MAX _POSIX_PATH_MAX
+#endif
+
+/* XPG3 defines the result of `setlocale (category, NULL)' as:
+   ``Directs `setlocale()' to query `category' and return the current
+     setting of `local'.''
+   However it does not specify the exact format.  And even worse: POSIX
+   defines this not at all.  So we can use this feature only on selected
+   system (e.g. those using GNU C Library).  */
+#ifdef _LIBC
+# define HAVE_LOCALE_NULL
+#endif
+
+/* Name of the default domain used for gettext(3) prior any call to
+   textdomain(3).  The default value for this is "messages".  */
+const char _nl_default_default_domain[] = "messages";
+
+/* Value used as the default domain for gettext(3).  */
+const char *_nl_current_default_domain = _nl_default_default_domain;
+
+/* Contains the default location of the message catalogs.  */
+const char _nl_default_dirname[] = GNULOCALEDIR;
+
+/* List with bindings of specific domains created by bindtextdomain()
+   calls.  */
+struct binding *_nl_domain_bindings;
+
+/* Prototypes for local functions.  */
+static char *find_msg PARAMS ((struct loaded_l10nfile *domain_file,
+			       const char *msgid)) internal_function;
+static const char *category_to_name PARAMS ((int category)) internal_function;
+static const char *guess_category_value PARAMS ((int category,
+						 const char *categoryname))
+     internal_function;
+
+
+/* For those loosing systems which don't have `alloca' we have to add
+   some additional code emulating it.  */
+#ifdef HAVE_ALLOCA
+/* Nothing has to be done.  */
+# define ADD_BLOCK(list, address) /* nothing */
+# define FREE_BLOCKS(list) /* nothing */
+#else
+struct block_list
+{
+  void *address;
+  struct block_list *next;
+};
+# define ADD_BLOCK(list, addr)						      \
+  do {									      \
+    struct block_list *newp = (struct block_list *) malloc (sizeof (*newp));  \
+    /* If we cannot get a free block we cannot add the new element to	      \
+       the list.  */							      \
+    if (newp != NULL) {							      \
+      newp->address = (addr);						      \
+      newp->next = (list);						      \
+      (list) = newp;							      \
+    }									      \
+  } while (0)
+# define FREE_BLOCKS(list)						      \
+  do {									      \
+    while (list != NULL) {						      \
+      struct block_list *old = list;					      \
+      list = list->next;						      \
+      free (old);							      \
+    }									      \
+  } while (0)
+# undef alloca
+# define alloca(size) (malloc (size))
+#endif	/* have alloca */
+
+
+/* Names for the libintl functions are a problem.  They must not clash
+   with existing names and they should follow ANSI C.  But this source
+   code is also used in GNU C Library where the names have a __
+   prefix.  So we have to make a difference here.  */
+#ifdef _LIBC
+# define DCGETTEXT __dcgettext
+#else
+# define DCGETTEXT dcgettext__
+#endif
+
+/* Look up MSGID in the DOMAINNAME message catalog for the current CATEGORY
+   locale.  */
+char *
+DCGETTEXT (domainname, msgid, category)
+     const char *domainname;
+     const char *msgid;
+     int category;
+{
+#ifndef HAVE_ALLOCA
+  struct block_list *block_list = NULL;
+#endif
+  struct loaded_l10nfile *domain;
+  struct binding *binding;
+  const char *categoryname;
+  const char *categoryvalue;
+  char *dirname, *xdomainname;
+  char *single_locale;
+  char *retval;
+  int saved_errno = errno;
+
+  /* If no real MSGID is given return NULL.  */
+  if (msgid == NULL)
+    return NULL;
+
+  /* If DOMAINNAME is NULL, we are interested in the default domain.  If
+     CATEGORY is not LC_MESSAGES this might not make much sense but the
+     defintion left this undefined.  */
+  if (domainname == NULL)
+    domainname = _nl_current_default_domain;
+
+  /* First find matching binding.  */
+  for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
+    {
+      int compare = strcmp (domainname, binding->domainname);
+      if (compare == 0)
+	/* We found it!  */
+	break;
+      if (compare < 0)
+	{
+	  /* It is not in the list.  */
+	  binding = NULL;
+	  break;
+	}
+    }
+
+  if (binding == NULL)
+    dirname = (char *) _nl_default_dirname;
+  else if (binding->dirname[0] == '/')
+    dirname = binding->dirname;
+  else
+    {
+      /* We have a relative path.  Make it absolute now.  */
+      size_t dirname_len = strlen (binding->dirname) + 1;
+      size_t path_max;
+      char *ret;
+
+      path_max = (unsigned) PATH_MAX;
+      path_max += 2;		/* The getcwd docs say to do this.  */
+
+      dirname = (char *) alloca (path_max + dirname_len);
+      ADD_BLOCK (block_list, dirname);
+
+      __set_errno (0);
+      while ((ret = getcwd (dirname, path_max)) == NULL && errno == ERANGE)
+	{
+	  path_max += PATH_INCR;
+	  dirname = (char *) alloca (path_max + dirname_len);
+	  ADD_BLOCK (block_list, dirname);
+	  __set_errno (0);
+	}
+
+      if (ret == NULL)
+	{
+	  /* We cannot get the current working directory.  Don't signal an
+	     error but simply return the default string.  */
+	  FREE_BLOCKS (block_list);
+	  __set_errno (saved_errno);
+	  return (char *) msgid;
+	}
+
+      stpcpy (stpcpy (strchr (dirname, '\0'), "/"), binding->dirname);
+    }
+
+  /* Now determine the symbolic name of CATEGORY and its value.  */
+  categoryname = category_to_name (category);
+  categoryvalue = guess_category_value (category, categoryname);
+
+  xdomainname = (char *) alloca (strlen (categoryname)
+				 + strlen (domainname) + 5);
+  ADD_BLOCK (block_list, xdomainname);
+
+  stpcpy (stpcpy (stpcpy (stpcpy (xdomainname, categoryname), "/"),
+		  domainname),
+	  ".mo");
+
+  /* Creating working area.  */
+  single_locale = (char *) alloca (strlen (categoryvalue) + 1);
+  ADD_BLOCK (block_list, single_locale);
+
+
+  /* Search for the given string.  This is a loop because we perhaps
+     got an ordered list of languages to consider for th translation.  */
+  while (1)
+    {
+      /* Make CATEGORYVALUE point to the next element of the list.  */
+      while (categoryvalue[0] != '\0' && categoryvalue[0] == ':')
+	++categoryvalue;
+      if (categoryvalue[0] == '\0')
+	{
+	  /* The whole contents of CATEGORYVALUE has been searched but
+	     no valid entry has been found.  We solve this situation
+	     by implicitly appending a "C" entry, i.e. no translation
+	     will take place.  */
+	  single_locale[0] = 'C';
+	  single_locale[1] = '\0';
+	}
+      else
+	{
+	  char *cp = single_locale;
+	  while (categoryvalue[0] != '\0' && categoryvalue[0] != ':')
+	    *cp++ = *categoryvalue++;
+	  *cp = '\0';
+	}
+
+      /* If the current locale value is C (or POSIX) we don't load a
+	 domain.  Return the MSGID.  */
+      if (strcmp (single_locale, "C") == 0
+	  || strcmp (single_locale, "POSIX") == 0)
+	{
+	  FREE_BLOCKS (block_list);
+	  __set_errno (saved_errno);
+	  return (char *) msgid;
+	}
+
+
+      /* Find structure describing the message catalog matching the
+	 DOMAINNAME and CATEGORY.  */
+      domain = _nl_find_domain (dirname, single_locale, xdomainname);
+
+      if (domain != NULL)
+	{
+	  retval = find_msg (domain, msgid);
+
+	  if (retval == NULL)
+	    {
+	      int cnt;
+
+	      for (cnt = 0; domain->successor[cnt] != NULL; ++cnt)
+		{
+		  retval = find_msg (domain->successor[cnt], msgid);
+
+		  if (retval != NULL)
+		    break;
+		}
+	    }
+
+	  if (retval != NULL)
+	    {
+	      FREE_BLOCKS (block_list);
+	      __set_errno (saved_errno);
+	      return retval;
+	    }
+	}
+    }
+  /* NOTREACHED */
+}
+
+#ifdef _LIBC
+/* Alias for function name in GNU C Library.  */
+weak_alias (__dcgettext, dcgettext);
+#endif
+
+
+static char *
+internal_function
+find_msg (domain_file, msgid)
+     struct loaded_l10nfile *domain_file;
+     const char *msgid;
+{
+  size_t top, act, bottom;
+  struct loaded_domain *domain;
+
+  if (domain_file->decided == 0)
+    _nl_load_domain (domain_file);
+
+  if (domain_file->data == NULL)
+    return NULL;
+
+  domain = (struct loaded_domain *) domain_file->data;
+
+  /* Locate the MSGID and its translation.  */
+  if (domain->hash_size > 2 && domain->hash_tab != NULL)
+    {
+      /* Use the hashing table.  */
+      nls_uint32 len = strlen (msgid);
+      nls_uint32 hash_val = hash_string (msgid);
+      nls_uint32 idx = hash_val % domain->hash_size;
+      nls_uint32 incr = 1 + (hash_val % (domain->hash_size - 2));
+      nls_uint32 nstr = W (domain->must_swap, domain->hash_tab[idx]);
+
+      if (nstr == 0)
+	/* Hash table entry is empty.  */
+	return NULL;
+
+      if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
+	  && strcmp (msgid,
+		     domain->data + W (domain->must_swap,
+				       domain->orig_tab[nstr - 1].offset)) == 0)
+	return (char *) domain->data + W (domain->must_swap,
+					  domain->trans_tab[nstr - 1].offset);
+
+      while (1)
+	{
+	  if (idx >= domain->hash_size - incr)
+	    idx -= domain->hash_size - incr;
+	  else
+	    idx += incr;
+
+	  nstr = W (domain->must_swap, domain->hash_tab[idx]);
+	  if (nstr == 0)
+	    /* Hash table entry is empty.  */
+	    return NULL;
+
+	  if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
+	      && strcmp (msgid,
+			 domain->data + W (domain->must_swap,
+					   domain->orig_tab[nstr - 1].offset))
+	         == 0)
+	    return (char *) domain->data
+	      + W (domain->must_swap, domain->trans_tab[nstr - 1].offset);
+	}
+      /* NOTREACHED */
+    }
+
+  /* Now we try the default method:  binary search in the sorted
+     array of messages.  */
+  bottom = 0;
+  top = domain->nstrings;
+  while (bottom < top)
+    {
+      int cmp_val;
+
+      act = (bottom + top) / 2;
+      cmp_val = strcmp (msgid, domain->data
+			       + W (domain->must_swap,
+				    domain->orig_tab[act].offset));
+      if (cmp_val < 0)
+	top = act;
+      else if (cmp_val > 0)
+	bottom = act + 1;
+      else
+	break;
+    }
+
+  /* If an translation is found return this.  */
+  return bottom >= top ? NULL : (char *) domain->data
+                                + W (domain->must_swap,
+				     domain->trans_tab[act].offset);
+}
+
+
+/* Return string representation of locale CATEGORY.  */
+static const char *
+internal_function
+category_to_name (category)
+     int category;
+{
+  const char *retval;
+
+  switch (category)
+  {
+#ifdef LC_COLLATE
+  case LC_COLLATE:
+    retval = "LC_COLLATE";
+    break;
+#endif
+#ifdef LC_CTYPE
+  case LC_CTYPE:
+    retval = "LC_CTYPE";
+    break;
+#endif
+#ifdef LC_MONETARY
+  case LC_MONETARY:
+    retval = "LC_MONETARY";
+    break;
+#endif
+#ifdef LC_NUMERIC
+  case LC_NUMERIC:
+    retval = "LC_NUMERIC";
+    break;
+#endif
+#ifdef LC_TIME
+  case LC_TIME:
+    retval = "LC_TIME";
+    break;
+#endif
+#ifdef LC_MESSAGES
+  case LC_MESSAGES:
+    retval = "LC_MESSAGES";
+    break;
+#endif
+#ifdef LC_RESPONSE
+  case LC_RESPONSE:
+    retval = "LC_RESPONSE";
+    break;
+#endif
+#ifdef LC_ALL
+  case LC_ALL:
+    /* This might not make sense but is perhaps better than any other
+       value.  */
+    retval = "LC_ALL";
+    break;
+#endif
+  default:
+    /* If you have a better idea for a default value let me know.  */
+    retval = "LC_XXX";
+  }
+
+  return retval;
+}
+
+/* Guess value of current locale from value of the environment variables.  */
+static const char *
+internal_function
+guess_category_value (category, categoryname)
+     int category;
+     const char *categoryname;
+{
+  const char *retval;
+
+  /* The highest priority value is the `LANGUAGE' environment
+     variable.  This is a GNU extension.  */
+  retval = getenv ("LANGUAGE");
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+
+  /* `LANGUAGE' is not set.  So we have to proceed with the POSIX
+     methods of looking to `LC_ALL', `LC_xxx', and `LANG'.  On some
+     systems this can be done by the `setlocale' function itself.  */
+#if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
+  return setlocale (category, NULL);
+#else
+  /* Setting of LC_ALL overwrites all other.  */
+  retval = getenv ("LC_ALL");
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+
+  /* Next comes the name of the desired category.  */
+  retval = getenv (categoryname);
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+
+  /* Last possibility is the LANG environment variable.  */
+  retval = getenv ("LANG");
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+
+  /* We use C as the default domain.  POSIX says this is implementation
+     defined.  */
+  return "C";
+#endif
+}
+
+/* @@ begin of epilog @@ */
+
+/* We don't want libintl.a to depend on any other library.  So we
+   avoid the non-standard function stpcpy.  In GNU C Library this
+   function is available, though.  Also allow the symbol HAVE_STPCPY
+   to be defined.  */
+#if !_LIBC && !HAVE_STPCPY
+static char *
+stpcpy (dest, src)
+     char *dest;
+     const char *src;
+{
+  while ((*dest++ = *src++) != '\0')
+    /* Do nothing. */ ;
+  return dest - 1;
+}
+#endif
+
+
+#ifdef _LIBC
+/* If we want to free all resources we have to do some work at
+   program's end.  */
+static void __attribute__ ((unused))
+free_mem (void)
+{
+  struct binding *runp;
+
+  for (runp = _nl_domain_bindings; runp != NULL; runp = runp->next)
+    {
+      free (runp->domainname);
+      if (runp->dirname != _nl_default_dirname)
+	/* Yes, this is a pointer comparison.  */
+	free (runp->dirname);
+    }
+
+  if (_nl_current_default_domain != _nl_default_default_domain)
+    /* Yes, again a pointer comparison.  */
+    free ((char *) _nl_current_default_domain);
+}
+
+text_set_element (__libc_subfreeres, free_mem);
+#endif