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glibc  2.9
Classes | Defines | Functions | Variables
localealias.c File Reference
#include <ctype.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "gettextP.h"

Go to the source code of this file.

Classes

struct  alias_map

Defines

#define _GNU_SOURCE   1
#define FEOF(fp)   feof (fp)
#define FGETS(buf, n, fp)   fgets (buf, n, fp)
#define alloca(n)   malloc (n)
#define freea(p)   free (p)
#define libc_freeres_ptr(decl)   decl

Functions

char * alloca ()
 libc_freeres_ptr (static char *string_space)
 libc_freeres_ptr (static struct alias_map *map)
static size_t read_alias_file PARAMS ((const char *fname, int fname_len))
static size_t internal_function read_alias_file (char *fname, int fname_len) const
static int extend_alias_table ()
static int alias_compare (struct alias_map *map1, const struct alias_map *map2) const

Variables

static size_t string_space_act
static size_t string_space_max
static size_t nmap
static size_t maxmap

Class Documentation

struct alias_map

Definition at line 113 of file localealias.c.

Class Members
const char * alias
const char * value

Define Documentation

#define _GNU_SOURCE   1

Definition at line 24 of file localealias.c.

#define alloca (   n)    malloc (n)

Definition at line 99 of file localealias.c.

#define FEOF (   fp)    feof (fp)

Definition at line 90 of file localealias.c.

#define FGETS (   buf,
  n,
  fp 
)    fgets (buf, n, fp)

Definition at line 91 of file localealias.c.

#define freea (   p)    free (p)

Definition at line 100 of file localealias.c.

#define libc_freeres_ptr (   decl)    decl

Definition at line 121 of file localealias.c.


Function Documentation

static int alias_compare ( struct alias_map map1,
const struct alias_map map2 
) const [static]

Definition at line 385 of file localealias.c.

{
#if defined _LIBC || defined HAVE_STRCASECMP
  return strcasecmp (map1->alias, map2->alias);
#else
  const unsigned char *p1 = (const unsigned char *) map1->alias;
  const unsigned char *p2 = (const unsigned char *) map2->alias;
  unsigned char c1, c2;

  if (p1 == p2)
    return 0;

  do
    {
      /* I know this seems to be odd but the tolower() function in
        some systems libc cannot handle nonalpha characters.  */
      c1 = isupper (*p1) ? tolower (*p1) : *p1;
      c2 = isupper (*p2) ? tolower (*p2) : *p2;
      if (c1 == '\0')
       break;
      ++p1;
      ++p2;
    }
  while (c1 == c2);

  return c1 - c2;
#endif
}

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char* alloca ( )
static int extend_alias_table ( ) [static]

Definition at line 366 of file localealias.c.

{
  size_t new_size;
  struct alias_map *new_map;

  new_size = maxmap == 0 ? 100 : 2 * maxmap;
  new_map = (struct alias_map *) realloc (map, (new_size
                                          * sizeof (struct alias_map)));
  if (new_map == NULL)
    /* Simply don't extend: we don't have any more core.  */
    return -1;

  map = new_map;
  maxmap = new_size;
  return 0;
}

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libc_freeres_ptr ( static char *  string_space)
libc_freeres_ptr ( static struct alias_map map)
static size_t read_alias_file PARAMS ( (const char *fname, int fname_len)  ) [static]

Definition at line 133 of file localealias.c.

{
  static const char *locale_alias_path = LOCALE_ALIAS_PATH;
  struct alias_map *retval;
  const char *result = NULL;
  size_t added;

#ifdef _LIBC
  __libc_lock_lock (lock);
#endif

  do
    {
      struct alias_map item;

      item.alias = name;

      if (nmap > 0)
       retval = (struct alias_map *) bsearch (&item, map, nmap,
                                          sizeof (struct alias_map),
                                          (int (*) PARAMS ((const void *,
                                                         const void *))
                                          ) alias_compare);
      else
       retval = NULL;

      /* We really found an alias.  Return the value.  */
      if (retval != NULL)
       {
         result = retval->value;
         break;
       }

      /* Perhaps we can find another alias file.  */
      added = 0;
      while (added == 0 && locale_alias_path[0] != '\0')
       {
         const char *start;

         while (locale_alias_path[0] == ':')
           ++locale_alias_path;
         start = locale_alias_path;

         while (locale_alias_path[0] != '\0' && locale_alias_path[0] != ':')
           ++locale_alias_path;

         if (start < locale_alias_path)
           added = read_alias_file (start, locale_alias_path - start);
       }
    }
  while (added != 0);

#ifdef _LIBC
  __libc_lock_unlock (lock);
#endif

  return result;
}
static size_t internal_function read_alias_file ( char *  fname,
int  fname_len 
) const [static]

Definition at line 204 of file localealias.c.

{
  FILE *fp;
  char *full_fname;
  size_t added;
  static const char aliasfile[] = "/locale.alias";

  full_fname = (char *) alloca (fname_len + sizeof aliasfile);
#ifdef HAVE_MEMPCPY
  mempcpy (mempcpy (full_fname, fname, fname_len),
          aliasfile, sizeof aliasfile);
#else
  memcpy (full_fname, fname, fname_len);
  memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile);
#endif

  /* Note the file is opened with cancellation in the I/O functions
     disabled.  */
  fp = fopen (full_fname, "rc");
  freea (full_fname);
  if (fp == NULL)
    return 0;

#ifdef HAVE___FSETLOCKING
  /* No threads present.  */
  __fsetlocking (fp, FSETLOCKING_BYCALLER);
#endif

  added = 0;
  while (!FEOF (fp))
    {
      /* It is a reasonable approach to use a fix buffer here because
        a) we are only interested in the first two fields
        b) these fields must be usable as file names and so must not
           be that long
        We avoid a multi-kilobyte buffer here since this would use up
        stack space which we might not have if the program ran out of
        memory.  */
      char buf[400];
      char *alias;
      char *value;
      char *cp;
      int complete_line;

      if (FGETS (buf, sizeof buf, fp) == NULL)
       /* EOF reached.  */
       break;

      /* Determine whether the line is complete.  */
      complete_line = strchr (buf, '\n') != NULL;

      cp = buf;
      /* Ignore leading white space.  */
      while (isspace ((unsigned char) cp[0]))
       ++cp;

      /* A leading '#' signals a comment line.  */
      if (cp[0] != '\0' && cp[0] != '#')
       {
         alias = cp++;
         while (cp[0] != '\0' && !isspace ((unsigned char) cp[0]))
           ++cp;
         /* Terminate alias name.  */
         if (cp[0] != '\0')
           *cp++ = '\0';

         /* Now look for the beginning of the value.  */
         while (isspace ((unsigned char) cp[0]))
           ++cp;

         if (cp[0] != '\0')
           {
             size_t alias_len;
             size_t value_len;

             value = cp++;
             while (cp[0] != '\0' && !isspace ((unsigned char) cp[0]))
              ++cp;
             /* Terminate value.  */
             if (cp[0] == '\n')
              {
                /* This has to be done to make the following test
                   for the end of line possible.  We are looking for
                   the terminating '\n' which do not overwrite here.  */
                *cp++ = '\0';
                *cp = '\n';
              }
             else if (cp[0] != '\0')
              *cp++ = '\0';

             if (nmap >= maxmap)
              if (__builtin_expect (extend_alias_table (), 0))
                goto out;

             alias_len = strlen (alias) + 1;
             value_len = strlen (value) + 1;

             if (string_space_act + alias_len + value_len > string_space_max)
              {
                /* Increase size of memory pool.  */
                size_t new_size = (string_space_max
                                 + (alias_len + value_len > 1024
                                   ? alias_len + value_len : 1024));
                char *new_pool = (char *) realloc (string_space, new_size);
                if (new_pool == NULL)
                  goto out;

                if (__builtin_expect (string_space != new_pool, 0))
                  {
                    size_t i;

                    for (i = 0; i < nmap; i++)
                     {
                       map[i].alias += new_pool - string_space;
                       map[i].value += new_pool - string_space;
                     }
                  }

                string_space = new_pool;
                string_space_max = new_size;
              }

             map[nmap].alias = memcpy (&string_space[string_space_act],
                                   alias, alias_len);
             string_space_act += alias_len;

             map[nmap].value = memcpy (&string_space[string_space_act],
                                   value, value_len);
             string_space_act += value_len;

             ++nmap;
             ++added;
           }
       }

      /* Possibly not the whole line fits into the buffer.  Ignore
        the rest of the line.  */
      if (! complete_line)
       do
         if (FGETS (buf, sizeof buf, fp) == NULL)
           /* Make sure the inner loop will be left.  The outer loop
              will exit at the `feof' test.  */
           break;
       while (strchr (buf, '\n') == NULL);
    }

out:
  /* Should we test for ferror()?  I think we have to silently ignore
     errors.  --drepper  */
  fclose (fp);

  if (added > 0)
    qsort (map, nmap, sizeof (struct alias_map),
          (int (*) PARAMS ((const void *, const void *))) alias_compare);

  return added;
}

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Variable Documentation

size_t maxmap [static]

Definition at line 129 of file localealias.c.

size_t nmap [static]

Definition at line 128 of file localealias.c.

Definition at line 125 of file localealias.c.

Definition at line 126 of file localealias.c.