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gnupg/common/simple-gettext.c

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/* simple-gettext.c - a simplified version of gettext.
* Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 of the License, or
* (at your option) any later version.
*
* GnuPG 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* This is a simplified version of gettext written by Ulrich Drepper.
* It is used for the Win32 version of GnuPG beucase all the overhead
* of gettext is not needed and we have to do some special Win32 stuff.
* I decided that this is far easier than to tweak gettext for the special
* cases (I tried it but it is a lot of code). wk 15.09.99
*/
#include <config.h>
#ifdef USE_SIMPLE_GETTEXT
#if !defined (_WIN32) && !defined (__CYGWIN32__)
#error This file can only be used under Windows or Cygwin32
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "util.h"
#include "sysutils.h"
/* The magic number of the GNU message catalog format. */
#define MAGIC 0x950412de
#define MAGIC_SWAPPED 0xde120495
/* Revision number of the currently used .mo (binary) file format. */
#define MO_REVISION_NUMBER 0
/* Header for binary .mo file format. */
struct mo_file_header
{
/* The magic number. */
u32 magic;
/* The revision number of the file format. */
u32 revision;
/* The number of strings pairs. */
u32 nstrings;
/* Offset of table with start offsets of original strings. */
u32 orig_tab_offset;
/* Offset of table with start offsets of translation strings. */
u32 trans_tab_offset;
/* Size of hashing table. */
u32 hash_tab_size;
/* Offset of first hashing entry. */
u32 hash_tab_offset;
};
struct string_desc
{
/* Length of addressed string. */
u32 length;
/* Offset of string in file. */
u32 offset;
};
struct overflow_space_s
{
struct overflow_space_s *next;
u32 idx;
char d[1];
};
struct loaded_domain
{
char *data;
int must_swap;
u32 nstrings;
char *mapped; /* 0 = not yet mapped, 1 = mapped,
2 = mapped to
overflow space */
struct overflow_space_s *overflow_space;
struct string_desc *orig_tab;
struct string_desc *trans_tab;
u32 hash_size;
u32 *hash_tab;
};
static struct loaded_domain *the_domain;
static __inline__ u32
do_swap_u32( u32 i )
{
return (i << 24) | ((i & 0xff00) << 8) | ((i >> 8) & 0xff00) | (i >> 24);
}
#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )
/* We assume to have `unsigned long int' value with at least 32 bits. */
#define HASHWORDBITS 32
/* The so called `hashpjw' function by P.J. Weinberger
[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
1986, 1987 Bell Telephone Laboratories, Inc.] */
static __inline__ ulong
hash_string( const char *str_param )
{
unsigned long int hval, g;
const char *str = str_param;
hval = 0;
while (*str != '\0')
{
hval <<= 4;
hval += (unsigned long int) *str++;
g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
if (g != 0)
{
hval ^= g >> (HASHWORDBITS - 8);
hval ^= g;
}
}
return hval;
}
static struct loaded_domain *
load_domain( const char *filename )
{
FILE *fp;
size_t size;
struct stat st;
struct mo_file_header *data = NULL;
struct loaded_domain *domain = NULL;
size_t to_read;
char *read_ptr;
fp = fopen( filename, "rb" );
if( !fp )
return NULL; /* can't open the file */
/* we must know about the size of the file */
if( fstat( fileno(fp ), &st )
|| (size = (size_t)st.st_size) != st.st_size
|| size < sizeof (struct mo_file_header) ) {
fclose( fp );
return NULL;
}
data = malloc( size );
if( !data ) {
fclose( fp );
return NULL; /* out of memory */
}
to_read = size;
read_ptr = (char *) data;
do {
long int nb = fread( read_ptr, 1, to_read, fp );
if( nb < to_read ) {
fclose (fp);
free(data);
return NULL; /* read error */
}
read_ptr += nb;
to_read -= nb;
} while( to_read > 0 );
fclose (fp);
/* Using the magic number we can test whether it really is a message
* catalog file. */
if( data->magic != MAGIC && data->magic != MAGIC_SWAPPED ) {
/* The magic number is wrong: not a message catalog file. */
free( data );
return NULL;
}
domain = calloc( 1, sizeof *domain );
if( !domain ) {
free( data );
return NULL;
}
domain->data = (char *) data;
domain->must_swap = data->magic != MAGIC;
/* Fill in the information about the available tables. */
switch( SWAPIT(domain->must_swap, data->revision) ) {
case 0:
domain->nstrings = SWAPIT(domain->must_swap, data->nstrings);
domain->orig_tab = (struct string_desc *)
((char *) data + SWAPIT(domain->must_swap, data->orig_tab_offset));
domain->trans_tab = (struct string_desc *)
((char *) data + SWAPIT(domain->must_swap, data->trans_tab_offset));
domain->hash_size = SWAPIT(domain->must_swap, data->hash_tab_size);
domain->hash_tab = (u32 *)
((char *) data + SWAPIT(domain->must_swap, data->hash_tab_offset));
break;
default: /* This is an invalid revision. */
free( data );
free( domain );
return NULL;
}
/* Allocate an array to keep track of code page mappings. */
domain->mapped = calloc( 1, domain->nstrings );
if( !domain->mapped ) {
free( data );
free( domain );
return NULL;
}
return domain;
}
/****************
* Set the file used for translations. Pass a NULL to disable
* translation. A new filename may be set at anytime.
* WARNING: After changing the filename you should not access any data
* retrieved by gettext().
*/
int
set_gettext_file( const char *filename )
{
struct loaded_domain *domain = NULL;
if( filename && *filename ) {
if( filename[0] == '/'
#ifdef HAVE_DRIVE_LETTERS
|| ( isalpha(filename[0])
&& filename[1] == ':'
&& (filename[2] == '/' || filename[2] == '\\') )
#endif
) {
/* absolute path - use it as is */
domain = load_domain( filename );
}
else { /* relative path - append ".mo" and get dir from the environment */
char *buf = NULL;
char *dir;
char *p;
dir = read_w32_registry_string( NULL,
"Control Panel\\Mingw32\\NLS",
"MODir" );
if( dir && (buf=malloc(strlen(dir)+strlen(filename)+1+3+1)) ) {
strcpy(stpcpy(stpcpy(stpcpy( buf, dir),"\\"), filename),".mo");
/* Better make sure that we don't mix forward and
backward slashes. It seems that some Windoze
versions don't accept this. */
for (p=buf; *p; p++)
{
if (*p == '/')
*p = '\\';
}
domain = load_domain( buf );
free(buf);
}
free(dir);
}
if( !domain )
return -1;
}
if( the_domain ) {
struct overflow_space_s *os, *os2;
free( the_domain->data );
free( the_domain->mapped );
for (os=the_domain->overflow_space; os; os = os2) {
os2 = os->next;
free (os);
}
free( the_domain );
the_domain = NULL;
}
the_domain = domain;
return 0;
}
static const char*
get_string( struct loaded_domain *domain, u32 idx )
{
struct overflow_space_s *os;
char *p;
p = domain->data + SWAPIT(domain->must_swap, domain->trans_tab[idx].offset);
if (!domain->mapped[idx])
{
size_t plen, buflen;
char *buf;
domain->mapped[idx] = 1;
plen = strlen (p);
buf = utf8_to_native (p, plen, -1);
buflen = strlen (buf);
if (buflen <= plen)
strcpy (p, buf);
else
{
/* There is not enough space for the translation - store it
in the overflow_space else and mark that in the mapped
array. Because we expect that this won't happen too
often, we use a simple linked list. */
os = malloc (sizeof *os + buflen);
if (os)
{
os->idx = idx;
strcpy (os->d, buf);
os->next = domain->overflow_space;
domain->overflow_space = os;
p = os->d;
}
else
p = "ERROR in GETTEXT MALLOC";
}
xfree (buf);
}
else if (domain->mapped[idx] == 2)
{ /* We need to get the string from the overflow_space. */
for (os=domain->overflow_space; os; os = os->next)
if (os->idx == idx)
return (const char*)os->d;
p = "ERROR in GETTEXT\n";
}
return (const char*)p;
}
const char *
gettext( const char *msgid )
{
struct loaded_domain *domain;
size_t act = 0;
size_t top, bottom;
if( !(domain = the_domain) )
goto not_found;
/* Locate the MSGID and its translation. */
if( domain->hash_size > 2 && domain->hash_tab ) {
/* Use the hashing table. */
u32 len = strlen (msgid);
u32 hash_val = hash_string (msgid);
u32 idx = hash_val % domain->hash_size;
u32 incr = 1 + (hash_val % (domain->hash_size - 2));
u32 nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
if ( !nstr ) /* Hash table entry is empty. */
goto not_found;
if( SWAPIT(domain->must_swap,
domain->orig_tab[nstr - 1].length) == len
&& !strcmp( msgid,
domain->data + SWAPIT(domain->must_swap,
domain->orig_tab[nstr - 1].offset)) )
return get_string( domain, nstr - 1 );
for(;;) {
if (idx >= domain->hash_size - incr)
idx -= domain->hash_size - incr;
else
idx += incr;
nstr = SWAPIT(domain->must_swap, domain->hash_tab[idx]);
if( !nstr )
goto not_found; /* Hash table entry is empty. */
if ( SWAPIT(domain->must_swap,
domain->orig_tab[nstr - 1].length) == len
&& !strcmp (msgid,
domain->data + SWAPIT(domain->must_swap,
domain->orig_tab[nstr - 1].offset)))
return get_string( domain, nstr-1 );
}
/* 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
+ SWAPIT(domain->must_swap,
domain->orig_tab[act].offset));
if (cmp_val < 0)
top = act;
else if (cmp_val > 0)
bottom = act + 1;
else
return get_string( domain, act );
}
not_found:
return msgid;
}
const char *
ngettext (const char *msgid1, const char *msgid2, unsigned long int n)
{
/* We use the simple Germanic plural rule. */
return gettext (n==1? msgid1 : msgid2);
}
#if 0
unsigned int cp1, cp2;
cp1 = GetConsoleCP();
cp2 = GetConsoleOutputCP();
log_info("InputCP=%u OutputCP=%u\n", cp1, cp2 );
if( !SetConsoleOutputCP( 1252 ) )
log_info("SetConsoleOutputCP failed: %s\n", w32_strerror (0));
cp1 = GetConsoleCP();
cp2 = GetConsoleOutputCP();
log_info("InputCP=%u OutputCP=%u after switch1\n", cp1, cp2 );
#endif
#endif /* USE_SIMPLE_GETTEXT */
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