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locfile.c

/* Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; 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 <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/stat.h>

#include "../../crypt/md5.h"
#include "localedef.h"
#include "locfile.h"
#include "simple-hash.h"

#include "locfile-kw.h"


/* Temporary storage of the locale data before writing it to the archive.  */
static locale_data_t to_archive;


int
locfile_read (struct localedef_t *result, const struct charmap_t *charmap)
{
  const char *filename = result->name;
  const char *repertoire_name = result->repertoire_name;
  int locale_mask = result->needed & ~result->avail;
  struct linereader *ldfile;
  int not_here = ALL_LOCALES;

  /* If no repertoire name was specified use the global one.  */
  if (repertoire_name == NULL)
    repertoire_name = repertoire_global;

  /* Open the locale definition file.  */
  ldfile = lr_open (filename, locfile_hash);
  if (ldfile == NULL)
    {
      if (filename != NULL && filename[0] != '/')
      {
        char *i18npath = getenv ("I18NPATH");
        if (i18npath != NULL && *i18npath != '\0')
          {
            char path[strlen (filename) + 1 + strlen (i18npath)
                    + sizeof ("/locales/") - 1];
            char *next;
            i18npath = strdupa (i18npath);


            while (ldfile == NULL
                 && (next = strsep (&i18npath, ":")) != NULL)
            {
              stpcpy (stpcpy (stpcpy (path, next), "/locales/"), filename);

              ldfile = lr_open (path, locfile_hash);

              if (ldfile == NULL)
                {
                  stpcpy (stpcpy (path, next), filename);

                  ldfile = lr_open (path, locfile_hash);
                }
            }
          }

        /* Test in the default directory.  */
        if (ldfile == NULL)
          {
            char path[strlen (filename) + 1 + sizeof (LOCSRCDIR)];

            stpcpy (stpcpy (stpcpy (path, LOCSRCDIR), "/"), filename);
            ldfile = lr_open (path, locfile_hash);
          }
      }

      if (ldfile == NULL)
      return 1;
    }

    /* Parse locale definition file and store result in RESULT.  */
  while (1)
    {
      struct token *now = lr_token (ldfile, charmap, NULL, NULL, verbose);
      enum token_t nowtok = now->tok;
      struct token *arg;

      if (nowtok == tok_eof)
      break;

      if (nowtok == tok_eol)
      /* Ignore empty lines.  */
      continue;

      switch (nowtok)
      {
      case tok_escape_char:
      case tok_comment_char:
        /* We need an argument.  */
        arg = lr_token (ldfile, charmap, NULL, NULL, verbose);

        if (arg->tok != tok_ident)
          {
            SYNTAX_ERROR (_("bad argument"));
            continue;
          }

        if (arg->val.str.lenmb != 1)
          {
            lr_error (ldfile, _("\
argument to `%s' must be a single character"),
                  nowtok == tok_escape_char
                  ? "escape_char" : "comment_char");

            lr_ignore_rest (ldfile, 0);
            continue;
          }

        if (nowtok == tok_escape_char)
          ldfile->escape_char = *arg->val.str.startmb;
        else
          ldfile->comment_char = *arg->val.str.startmb;
        break;

      case tok_repertoiremap:
        /* We need an argument.  */
        arg = lr_token (ldfile, charmap, NULL, NULL, verbose);

        if (arg->tok != tok_ident)
          {
            SYNTAX_ERROR (_("bad argument"));
            continue;
          }

        if (repertoire_name == NULL)
          {
            repertoire_name = memcpy (xmalloc (arg->val.str.lenmb + 1),
                              arg->val.str.startmb,
                              arg->val.str.lenmb);
            ((char *) repertoire_name)[arg->val.str.lenmb] = '\0';
          }
        break;

      case tok_lc_ctype:
        ctype_read (ldfile, result, charmap, repertoire_name,
                  (locale_mask & CTYPE_LOCALE) == 0);
        result->avail |= locale_mask & CTYPE_LOCALE;
        not_here ^= CTYPE_LOCALE;
        continue;

      case tok_lc_collate:
        collate_read (ldfile, result, charmap, repertoire_name,
                  (locale_mask & COLLATE_LOCALE) == 0);
        result->avail |= locale_mask & COLLATE_LOCALE;
        not_here ^= COLLATE_LOCALE;
        continue;

      case tok_lc_monetary:
        monetary_read (ldfile, result, charmap, repertoire_name,
                   (locale_mask & MONETARY_LOCALE) == 0);
        result->avail |= locale_mask & MONETARY_LOCALE;
        not_here ^= MONETARY_LOCALE;
        continue;

      case tok_lc_numeric:
        numeric_read (ldfile, result, charmap, repertoire_name,
                  (locale_mask & NUMERIC_LOCALE) == 0);
        result->avail |= locale_mask & NUMERIC_LOCALE;
        not_here ^= NUMERIC_LOCALE;
        continue;

      case tok_lc_time:
        time_read (ldfile, result, charmap, repertoire_name,
                 (locale_mask & TIME_LOCALE) == 0);
        result->avail |= locale_mask & TIME_LOCALE;
        not_here ^= TIME_LOCALE;
        continue;

      case tok_lc_messages:
        messages_read (ldfile, result, charmap, repertoire_name,
                   (locale_mask & MESSAGES_LOCALE) == 0);
        result->avail |= locale_mask & MESSAGES_LOCALE;
        not_here ^= MESSAGES_LOCALE;
        continue;

      case tok_lc_paper:
        paper_read (ldfile, result, charmap, repertoire_name,
                  (locale_mask & PAPER_LOCALE) == 0);
        result->avail |= locale_mask & PAPER_LOCALE;
        not_here ^= PAPER_LOCALE;
        continue;

      case tok_lc_name:
        name_read (ldfile, result, charmap, repertoire_name,
                 (locale_mask & NAME_LOCALE) == 0);
        result->avail |= locale_mask & NAME_LOCALE;
        not_here ^= NAME_LOCALE;
        continue;

      case tok_lc_address:
        address_read (ldfile, result, charmap, repertoire_name,
                  (locale_mask & ADDRESS_LOCALE) == 0);
        result->avail |= locale_mask & ADDRESS_LOCALE;
        not_here ^= ADDRESS_LOCALE;
        continue;

      case tok_lc_telephone:
        telephone_read (ldfile, result, charmap, repertoire_name,
                    (locale_mask & TELEPHONE_LOCALE) == 0);
        result->avail |= locale_mask & TELEPHONE_LOCALE;
        not_here ^= TELEPHONE_LOCALE;
        continue;

      case tok_lc_measurement:
        measurement_read (ldfile, result, charmap, repertoire_name,
                      (locale_mask & MEASUREMENT_LOCALE) == 0);
        result->avail |= locale_mask & MEASUREMENT_LOCALE;
        not_here ^= MEASUREMENT_LOCALE;
        continue;

      case tok_lc_identification:
        identification_read (ldfile, result, charmap, repertoire_name,
                         (locale_mask & IDENTIFICATION_LOCALE) == 0);
        result->avail |= locale_mask & IDENTIFICATION_LOCALE;
        not_here ^= IDENTIFICATION_LOCALE;
        continue;

      default:
        SYNTAX_ERROR (_("\
syntax error: not inside a locale definition section"));
        continue;
      }

      /* The rest of the line must be empty.  */
      lr_ignore_rest (ldfile, 1);
    }

  /* We read all of the file.  */
  lr_close (ldfile);

  /* Mark the categories which are not contained in the file.  We assume
     them to be available and the default data will be used.  */
  result->avail |= not_here;

  return 0;
}


/* Semantic checking of locale specifications.  */

static void (*const check_funcs[]) (struct localedef_t *,
                            const struct charmap_t *) =
{
  [LC_CTYPE] = ctype_finish,
  [LC_COLLATE] = collate_finish,
  [LC_MESSAGES] = messages_finish,
  [LC_MONETARY] = monetary_finish,
  [LC_NUMERIC] = numeric_finish,
  [LC_TIME] = time_finish,
  [LC_PAPER] = paper_finish,
  [LC_NAME] = name_finish,
  [LC_ADDRESS] = address_finish,
  [LC_TELEPHONE] = telephone_finish,
  [LC_MEASUREMENT] = measurement_finish,
  [LC_IDENTIFICATION] = identification_finish
};

void
check_all_categories (struct localedef_t *definitions,
                  const struct charmap_t *charmap)
{
  int cnt;

  for (cnt = 0; cnt < sizeof (check_funcs) / sizeof (check_funcs[0]); ++cnt)
    if (check_funcs[cnt] != NULL)
      check_funcs[cnt] (definitions, charmap);
}


/* Writing the locale data files.  All files use the same output_path.  */

static void (*const write_funcs[]) (struct localedef_t *,
                            const struct charmap_t *, const char *) =
{
  [LC_CTYPE] = ctype_output,
  [LC_COLLATE] = collate_output,
  [LC_MESSAGES] = messages_output,
  [LC_MONETARY] = monetary_output,
  [LC_NUMERIC] = numeric_output,
  [LC_TIME] = time_output,
  [LC_PAPER] = paper_output,
  [LC_NAME] = name_output,
  [LC_ADDRESS] = address_output,
  [LC_TELEPHONE] = telephone_output,
  [LC_MEASUREMENT] = measurement_output,
  [LC_IDENTIFICATION] = identification_output
};


void
write_all_categories (struct localedef_t *definitions,
                  const struct charmap_t *charmap, const char *locname,
                  const char *output_path)
{
  int cnt;

  for (cnt = 0; cnt < sizeof (write_funcs) / sizeof (write_funcs[0]); ++cnt)
    if (write_funcs[cnt] != NULL)
      write_funcs[cnt] (definitions, charmap, output_path);

  if (! no_archive)
    {
      /* The data has to be added to the archive.  Do this now.  */
      struct locarhandle ah;

      /* Open the archive.  This call never returns if we cannot
       successfully open the archive.  */
      open_archive (&ah, false);

      if (add_locale_to_archive (&ah, locname, to_archive, true) != 0)
      error (EXIT_FAILURE, errno, _("cannot add to locale archive"));

      /* We are done.  */
      close_archive (&ah);
    }
}


/* Return a NULL terminated list of the directories next to output_path
   that have the same owner, group, permissions and device as output_path.  */
static const char **
siblings_uncached (const char *output_path)
{
  size_t len;
  char *base, *p;
  struct stat output_stat;
  DIR *dirp;
  int nelems;
  const char **elems;

  /* Remove trailing slashes and trailing pathname component.  */
  len = strlen (output_path);
  base = (char *) alloca (len);
  memcpy (base, output_path, len);
  p = base + len;
  while (p > base && p[-1] == '/')
    p--;
  if (p == base)
    return NULL;
  do
    p--;
  while (p > base && p[-1] != '/');
  if (p == base)
    return NULL;
  *--p = '\0';
  len = p - base;

  /* Get the properties of output_path.  */
  if (lstat (output_path, &output_stat) < 0 || !S_ISDIR (output_stat.st_mode))
    return NULL;

  /* Iterate through the directories in base directory.  */
  dirp = opendir (base);
  if (dirp == NULL)
    return NULL;
  nelems = 0;
  elems = NULL;
  for (;;)
    {
      struct dirent64 *other_dentry;
      const char *other_name;
      char *other_path;
      struct stat other_stat;

      other_dentry = readdir64 (dirp);
      if (other_dentry == NULL)
      break;

      other_name = other_dentry->d_name;
      if (strcmp (other_name, ".") == 0 || strcmp (other_name, "..") == 0)
      continue;

      other_path = (char *) xmalloc (len + 1 + strlen (other_name) + 2);
      memcpy (other_path, base, len);
      other_path[len] = '/';
      strcpy (other_path + len + 1, other_name);

      if (lstat (other_path, &other_stat) >= 0
        && S_ISDIR (other_stat.st_mode)
        && other_stat.st_uid == output_stat.st_uid
        && other_stat.st_gid == output_stat.st_gid
        && other_stat.st_mode == output_stat.st_mode
        && other_stat.st_dev == output_stat.st_dev)
      {
        /* Found a subdirectory.  Add a trailing slash and store it.  */
        p = other_path + len + 1 + strlen (other_name);
        *p++ = '/';
        *p = '\0';
        elems = (const char **) xrealloc ((char *) elems,
                                  (nelems + 2) * sizeof (char **));
        elems[nelems++] = other_path;
      }
      else
      free (other_path);
    }
  closedir (dirp);

  if (elems != NULL)
    elems[nelems] = NULL;
  return elems;
}


/* Return a NULL terminated list of the directories next to output_path
   that have the same owner, group, permissions and device as output_path.
   Cache the result for future calls.  */
static const char **
siblings (const char *output_path)
{
  static const char *last_output_path;
  static const char **last_result;

  if (output_path != last_output_path)
    {
      if (last_result != NULL)
      {
        const char **p;

        for (p = last_result; *p != NULL; p++)
          free ((char *) *p);
        free (last_result);
      }

      last_output_path = output_path;
      last_result = siblings_uncached (output_path);
    }
  return last_result;
}


/* Read as many bytes from a file descriptor as possible.  */
static ssize_t
full_read (int fd, void *bufarea, size_t nbyte)
{
  char *buf = (char *) bufarea;

  while (nbyte > 0)
    {
      ssize_t retval = read (fd, buf, nbyte);

      if (retval == 0)
      break;
      else if (retval > 0)
      {
        buf += retval;
        nbyte -= retval;
      }
      else if (errno != EINTR)
      return retval;
    }
  return buf - (char *) bufarea;
}


/* Compare the contents of two regular files of the same size.  Return 0
   if they are equal, 1 if they are different, or -1 if an error occurs.  */
static int
compare_files (const char *filename1, const char *filename2, size_t size,
             size_t blocksize)
{
  int fd1, fd2;
  int ret = -1;

  fd1 = open (filename1, O_RDONLY);
  if (fd1 >= 0)
    {
      fd2 = open (filename2, O_RDONLY);
      if (fd2 >= 0)
      {
        char *buf1 = (char *) xmalloc (2 * blocksize);
        char *buf2 = buf1 + blocksize;

        ret = 0;
        while (size > 0)
          {
            size_t bytes = (size < blocksize ? size : blocksize);

            if (full_read (fd1, buf1, bytes) < (ssize_t) bytes)
            {
              ret = -1;
              break;
            }
            if (full_read (fd2, buf2, bytes) < (ssize_t) bytes)
            {
              ret = -1;
              break;
            }
            if (memcmp (buf1, buf2, bytes) != 0)
            {
              ret = 1;
              break;
            }
            size -= bytes;
          }

        free (buf1);
        close (fd2);
      }
      close (fd1);
    }
  return ret;
}


/* Write a locale file, with contents given by N_ELEM and VEC.  */
void
write_locale_data (const char *output_path, int catidx, const char *category,
               size_t n_elem, struct iovec *vec)
{
  size_t cnt, step, maxiov;
  int fd;
  char *fname;
  const char **other_paths;

  if (! no_archive)
    {
      /* The data will be added to the archive.  For now we simply
       generate the image which will be written.  First determine
       the size.  */
      int cnt;
      void *endp;

      to_archive[catidx].size = 0;
      for (cnt = 0; cnt < n_elem; ++cnt)
      to_archive[catidx].size += vec[cnt].iov_len;

      /* Allocate the memory for it.  */
      to_archive[catidx].addr = xmalloc (to_archive[catidx].size);

      /* Fill it in.  */
      for (cnt = 0, endp = to_archive[catidx].addr; cnt < n_elem; ++cnt)
      endp = mempcpy (endp, vec[cnt].iov_base, vec[cnt].iov_len);

      /* Compute the MD5 sum for the data.  */
      __md5_buffer (to_archive[catidx].addr, to_archive[catidx].size,
                to_archive[catidx].sum);

      return;
    }

  fname = xmalloc (strlen (output_path) + 2 * strlen (category) + 7);

  /* Normally we write to the directory pointed to by the OUTPUT_PATH.
     But for LC_MESSAGES we have to take care for the translation
     data.  This means we need to have a directory LC_MESSAGES in
     which we place the file under the name SYS_LC_MESSAGES.  */
  sprintf (fname, "%s%s", output_path, category);
  fd = -2;
  if (strcmp (category, "LC_MESSAGES") == 0)
    {
      struct stat st;

      if (stat (fname, &st) < 0)
      {
        if (mkdir (fname, 0777) >= 0)
          {
            fd = -1;
            errno = EISDIR;
          }
      }
      else if (!S_ISREG (st.st_mode))
      {
        fd = -1;
        errno = EISDIR;
      }
    }

  /* Create the locale file with nlinks == 1; this avoids crashing processes
     which currently use the locale and damaging files belonging to other
     locales as well.  */
  if (fd == -2)
    {
      unlink (fname);
      fd = creat (fname, 0666);
    }

  if (fd == -1)
    {
      int save_err = errno;

      if (errno == EISDIR)
      {
        sprintf (fname, "%1$s%2$s/SYS_%2$s", output_path, category);
        unlink (fname);
        fd = creat (fname, 0666);
        if (fd == -1)
          save_err = errno;
      }

      if (fd == -1)
      {
        if (!be_quiet)
          WITH_CUR_LOCALE (error (0, save_err, _("\
cannot open output file `%s' for category `%s'"), fname, category));
        free (fname);
        return;
      }
    }

#ifdef UIO_MAXIOV
  maxiov = UIO_MAXIOV;
#else
  maxiov = sysconf (_SC_UIO_MAXIOV);
#endif

  /* Write the data using writev.  But we must take care for the
     limitation of the implementation.  */
  for (cnt = 0; cnt < n_elem; cnt += step)
    {
      step = n_elem - cnt;
      if (maxiov > 0)
      step = MIN (maxiov, step);

      if (writev (fd, &vec[cnt], step) < 0)
      {
        if (!be_quiet)
          WITH_CUR_LOCALE (error (0, errno, _("\
failure while writing data for category `%s'"), category));
        break;
      }
    }

  close (fd);

  /* Compare the file with the locale data files for the same category in
     other locales, and see if we can reuse it, to save disk space.  */
  other_paths = siblings (output_path);
  if (other_paths != NULL)
    {
      struct stat fname_stat;

      if (lstat (fname, &fname_stat) >= 0
        && S_ISREG (fname_stat.st_mode))
      {
        const char *fname_tail = fname + strlen (output_path);
        const char **other_p;
        int seen_count;
        ino_t *seen_inodes;

        seen_count = 0;
        for (other_p = other_paths; *other_p; other_p++)
          seen_count++;
        seen_inodes = (ino_t *) xmalloc (seen_count * sizeof (ino_t));
        seen_count = 0;

        for (other_p = other_paths; *other_p; other_p++)
          {
            const char *other_path = *other_p;
            size_t other_path_len = strlen (other_path);
            char *other_fname;
            struct stat other_fname_stat;

            other_fname =
            (char *) xmalloc (other_path_len + strlen (fname_tail) + 1);
            memcpy (other_fname, other_path, other_path_len);
            strcpy (other_fname + other_path_len, fname_tail);

            if (lstat (other_fname, &other_fname_stat) >= 0
              && S_ISREG (other_fname_stat.st_mode)
              /* Consider only files on the same device.
                 Otherwise hard linking won't work anyway.  */
              && other_fname_stat.st_dev == fname_stat.st_dev
              /* Consider only files with the same permissions.
                 Otherwise there are security risks.  */
              && other_fname_stat.st_uid == fname_stat.st_uid
              && other_fname_stat.st_gid == fname_stat.st_gid
              && other_fname_stat.st_mode == fname_stat.st_mode
              /* Don't compare fname with itself.  */
              && other_fname_stat.st_ino != fname_stat.st_ino
              /* Files must have the same size, otherwise they
                 cannot be the same.  */
              && other_fname_stat.st_size == fname_stat.st_size)
            {
              /* Skip this file if we have already read it (under a
                 different name).  */
              int i;

              for (i = seen_count - 1; i >= 0; i--)
                if (seen_inodes[i] == other_fname_stat.st_ino)
                  break;
              if (i < 0)
                {
                  /* Now compare fname and other_fname for real.  */
                  blksize_t blocksize;

#ifdef _STATBUF_ST_BLKSIZE
                  blocksize = MAX (fname_stat.st_blksize,
                               other_fname_stat.st_blksize);
                  if (blocksize > 8 * 1024)
                  blocksize = 8 * 1024;
#else
                  blocksize = 8 * 1024;
#endif

                  if (compare_files (fname, other_fname,
                               fname_stat.st_size, blocksize) == 0)
                  {
                    /* Found! other_fname is identical to fname.  */
                    /* Link other_fname to fname.  But use a temporary
                       file, in case hard links don't work on the
                       particular filesystem.  */
                    char * tmp_fname =
                      (char *) xmalloc (strlen (fname) + 4 + 1);

                    strcpy (stpcpy (tmp_fname, fname), ".tmp");

                    if (link (other_fname, tmp_fname) >= 0)
                      {
                        unlink (fname);
                        if (rename (tmp_fname, fname) < 0)
                        {
                          if (!be_quiet)
                            WITH_CUR_LOCALE (error (0, errno, _("\
cannot create output file `%s' for category `%s'"), fname, category));
                        }
                        free (tmp_fname);
                        free (other_fname);
                        break;
                      }
                    free (tmp_fname);
                  }

                  /* Don't compare with this file a second time.  */
                  seen_inodes[seen_count++] = other_fname_stat.st_ino;
                }
            }
            free (other_fname);
          }
        free (seen_inodes);
      }
    }

  free (fname);
}

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