trunk/Src/wptNLS.cpp

/* wptNLS.cpp - W32 Native Language Support
 *      Copyright (C) 2001-2003, 2006, 2008, 2009 Timo Schulz
 *      Copyright (C) 1995-1999 Free Software Foundation, Inc.
 *
 * This code is a stripped down version of simple-gettext.c 
 * written by by Ulrich Drepper from the GPG project.
 *
 * WinPT 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.
 *  
 * WinPT 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.
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <windows.h>

#include "wptNLS.h"
#include "wptTypes.h"
#include "wptUtil.h"
#include "wptW32API.h"
#include "wptVersion.h"
#include "StringBuffer.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

#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

/* Header for binary .mo file format.  */
struct mo_file_header {
    DWORD magic;            /* The magic number.        */
    DWORD revision;         /* The revision number of the file format.  */
    DWORD nstrings;         /* The number of strings pairs.  */
    DWORD orig_tab_offset;  /* Offset of table with start offsets of original 
                                strings.  */
    DWORD trans_tab_offset;   /* Offset of table with start offsets of translation
                             strings.  */
    DWORD hash_tab_size;        /* Size of hashing table.  */
    DWORD hash_tab_offset;    /* Offset of first hashing entry.  */
};

struct string_desc {
    DWORD length; /* Length of addressed string.  */  
    DWORD offset; /* Offset of string in file.  */
};

struct loaded_domain_s {
    char *file_name;
    time_t modify_time;
    char *data;
    int must_swap;
    DWORD nstrings;
    char *mapped;
    struct string_desc *orig_tab;
    struct string_desc *trans_tab;
    DWORD hash_size;
    DWORD *hash_tab;
};
typedef struct loaded_domain_s *gettext_domain_t;

/* List of all available languages. */
struct lang_table_s lang_list[] = {
    {"en", "English",   LANG_ENGLISH},
    {"de", "German",    LANG_GERMAN},
    {"ru", "Russian",   LANG_RUSSIAN},
    {NULL, NULL, 0}
};


/* The current gettext domain. */
static gettext_domain_t the_domain;


/* Return TRUE if the native user language is not English 
   and thus, gettext support is available */
static bool
gettext_is_required (void)
{
    LANGID lang = GetUserDefaultLangID ();
    if (PRIMARYLANGID (lang) == LANG_ENGLISH)
        return false;
    return true;
}


static DWORD
do_swap_u32 (DWORD i)
{
    return (i << 24) | ((i & 0xff00) << 8) | ((i >> 8) & 0xff00) | (i >> 24);
}


/* 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 DWORD
hash_string (const char *str_param)
{
    DWORD hval, g;
    const char *str = str_param;

    hval = 0;
    while (*str != '\0') {
        hval <<= 4;
        hval += (DWORD) *str++; 
        g = hval & ((DWORD) 0xf << (HASHWORDBITS - 4));
        if (g != 0) {
            hval ^= g >> (HASHWORDBITS - 8);
            hval ^= g;  
        }
    }
    return hval;
}


static gettext_domain_t
load_domain (const char *filename)
{
    FILE *fp;
    size_t size;
    struct stat st;
    struct mo_file_header *data = NULL;
    gettext_domain_t domain = NULL;
    size_t to_read;
    char *read_ptr;

    fp = fopen (filename, "rb");
    if (!fp)
       return NULL;
    /* we must know about the size of the file */
    if (fstat (fileno(fp), &st) ||
        (size = (size_t)st.st_size) != (size_t)st.st_size ||
        size < sizeof (struct mo_file_header)) {
        fclose (fp);
        return NULL;
    }

    data = (struct mo_file_header *) malloc (size);
    if (!data)
        BUG (0);

    to_read = size;
    read_ptr = (char *) data;
    do {
        size_t 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 = (struct loaded_domain_s *)calloc (1, sizeof *domain);
    if (!domain)
        BUG (0);
    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 = (DWORD *)  
              ((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 = (char *)calloc (1, domain->nstrings);
    if (!domain->mapped) 
        BUG (0);
    
    domain->file_name = strdup (filename);
    domain->modify_time = st.st_mtime;
    return domain;
}


/* To avoid problems that the current directory is not the
 * same folder the WinPT.exe is located in, we extract the
 * module directory.
 */
char*
get_module_dir (char *buf, DWORD buflen)
{
    if (buflen < 1 || !GetModuleFileName (glob_hinst, buf, buflen-1))
        return NULL;

    size_t pos = strlen (buf);
    while (pos > 0 && buf[--pos] != '\\')
        ;
    buf[pos+1] = '\0';
    return buf;
}


/* Returns a localisation name for a specific resource (file).
 * For instance, lang=DE and file=winpt.chm will become winpt.DE.chm
 */
char*
get_locale_name (const char *file)
{
    const char *lang = gettext_get_langid ();
    char *name, *ext;
    char *p, buf[MAX_PATH+1];
    
    p = strrchr (file, '.');
    if (p == NULL) {
        p = new char[strlen(file)+strlen(lang)+2+1];
        sprintf (p, "%s.%s", file, lang);
        return p;
    }
    name = substr (file, 0, p - file);
    ext = substr (file, p - file + 1, strlen(file));
    p = get_module_dir (buf, MAX_PATH);
    if (!p)
        BUG (NULL);
    StringBuffer s = p;
    s = s + name + "." + lang + "." + ext;
    p = s.getBufferCopy();
    free_if_alloc (name);
    free_if_alloc (ext);
    return p;
}


/* Deallocate static resources. */
void
gettext_free_current_domain (void)
{
    if (the_domain == NULL)
        return;
    free (the_domain->data);
    free (the_domain->mapped);
    free (the_domain->file_name);
    free (the_domain);
    the_domain = NULL;
}


/* Replace and release the old domain and assign a new domain then */
static void
gettext_update_domain (gettext_domain_t new_dom)
{
    gettext_free_current_domain ();
    the_domain = new_dom;
}


char* get_reg_entry_mo (void);

/* Fallback code which is used when no new NLS file were found.
   Then we read the MODir registry key and check if a file named 
   'winpt.mo' exists in this directory. */
static gettext_domain_t
load_modir_domain (void)
{        
    char *modir = get_reg_entry_mo ();
    if (!modir)
        return NULL;
    if (dir_exist_check (modir)) {
        free_if_alloc (modir);
        return NULL;
    }
    StringBuffer s = modir;
    if (modir[strlen (modir)-1] != '\\')
        s += "\\";
    s += "winpt.mo";
    
    gettext_domain_t domain = NULL;
    const char *fname = s.getBuffer();
    if (!file_exist_check (fname))
        domain = load_domain (fname);
    free_if_alloc (modir);
    return domain;
}


/* Try to load the user domain, either from
   the WinPT.exe directory or from the registry */
int
gettext_set_user_domain (void)
{
    if (!gettext_is_required ())
        return 0;
    
    gettext_domain_t domain = NULL;
    char *file = get_locale_name ("winpt.mo");
    if (file && !file_exist_check (file))
        domain = load_domain (file);
    else
        domain = load_modir_domain ();
    free_if_alloc (file);
    gettext_update_domain (domain);
    return 0;
}


int
gettext_domain_needs_refresh (void)
{
    struct stat st;
    
    if (the_domain == NULL || stat (the_domain->file_name, &st))
        return 0;
    /* '1' means that the MO file were modified in the mean time
       and the application should reload the domain. */
    if (st.st_mtime != the_domain->modify_time)
        return 1;
    
    return 0;
}

static const char*
get_string (gettext_domain_t domain, DWORD idx)
{
    char *p = domain->data + SWAPIT(domain->must_swap,
                                    domain->trans_tab[idx].offset);
    if (!domain->mapped[idx])
        domain->mapped[idx] = 1;
    /* FIXME: all text is in UTF-8 and need to be converted to
       the locale charset. But the caller does not free the data and
       thus we will get a leak */
    return (const char *)p;
}


const char *
gettext (const char *msgid)
{
    size_t act = 0;
    size_t top, bottom;
    
    gettext_domain_t domain = the_domain;
    if (domain == NULL)
        goto not_found;

    /* Locate the MSGID and its translation.  */
    if (domain->hash_size > 2 && domain->hash_tab) {
        /* Use the hashing table.  */           
        DWORD len = strlen (msgid);     
        DWORD hash_val = hash_string (msgid);   
        DWORD idx = hash_val % domain->hash_size;       
        DWORD incr = 1 + (hash_val % (domain->hash_size - 2));  
        DWORD 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) {      
        act = (bottom + top) / 2;       
        int 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;
}


/* Map the user specific language ID to a gettext conform language string.
   English "en" is defined as the fallback.
   Example: LANG_GERMAN -> "de" */
const char*
gettext_get_langid (void)
{
    LANGID lang = GetUserDefaultLangID ();
    
    for (int i=0; lang_list[i].id; i++) {
        if (PRIMARYLANGID (lang) == lang_list[i].langid)
            return lang_list[i].id;
    }
    
    return "en";
}


/* Take a table with control item IDs and their translation
   and set each text to the translated value. */
void
gettext_localize_dialog (HWND dlg, struct gettext_tab_s *tab, const char *title)
{
    for (int i=0; tab[i].trans != NULL; i++)
        SetDlgItemText (dlg, tab[i].ctlid, tab[i].trans);
    if (title != NULL)
        SetWindowText (dlg, title);
}
1	/* wptNLS.cpp - W32 Native Language Support
2	* Copyright (C) 2001-2003, 2006, 2008, 2009 Timo Schulz
3	* Copyright (C) 1995-1999 Free Software Foundation, Inc.
4	*
5	* This code is a stripped down version of simple-gettext.c
6	* written by by Ulrich Drepper from the GPG project.
7	*
8	* WinPT is free software; you can redistribute it and/or
9	* modify it under the terms of the GNU General Public License
10	* as published by the Free Software Foundation; either version 2
11	* of the License, or (at your option) any later version.
12	*
13	* WinPT is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* General Public License for more details.
17	*/
18	#ifdef HAVE_CONFIG_H
19	#include <config.h>
20	#endif
21
22	#include <stdio.h>
23	#include <string.h>
24	#include <sys/stat.h>
25	#include <time.h>
26	#include <windows.h>
27
28	#include "wptNLS.h"
29	#include "wptTypes.h"
30	#include "wptUtil.h"
31	#include "wptW32API.h"
32	#include "wptVersion.h"
33	#include "StringBuffer.h"
34
35	/* The magic number of the GNU message catalog format. */
36	#define MAGIC 0x950412de
37	#define MAGIC_SWAPPED 0xde120495
38
39	/* Revision number of the currently used .mo (binary) file format. */
40	#define MO_REVISION_NUMBER 0
41
42	#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )
43
44
45	/* We assume to have `unsigned long int' value with at least 32 bits. */
46	#define HASHWORDBITS 32
47
48	/* Header for binary .mo file format. */
49	struct mo_file_header {
50	DWORD magic; /* The magic number. */
51	DWORD revision; /* The revision number of the file format. */
52	DWORD nstrings; /* The number of strings pairs. */
53	DWORD orig_tab_offset; /* Offset of table with start offsets of original
54	strings. */
55	DWORD trans_tab_offset; /* Offset of table with start offsets of translation
56	strings. */
57	DWORD hash_tab_size; /* Size of hashing table. */
58	DWORD hash_tab_offset; /* Offset of first hashing entry. */
59	};
60
61	struct string_desc {
62	DWORD length; /* Length of addressed string. */
63	DWORD offset; /* Offset of string in file. */
64	};
65
66	struct loaded_domain_s {
67	char *file_name;
68	time_t modify_time;
69	char *data;
70	int must_swap;
71	DWORD nstrings;
72	char *mapped;
73	struct string_desc *orig_tab;
74	struct string_desc *trans_tab;
75	DWORD hash_size;
76	DWORD *hash_tab;
77	};
78	typedef struct loaded_domain_s *gettext_domain_t;
79
80	/* List of all available languages. */
81	struct lang_table_s lang_list[] = {
82	{"en", "English", LANG_ENGLISH},
83	{"de", "German", LANG_GERMAN},
84	{"ru", "Russian", LANG_RUSSIAN},
85	{NULL, NULL, 0}
86	};
87
88
89	/* The current gettext domain. */
90	static gettext_domain_t the_domain;
91
92
93	/* Return TRUE if the native user language is not English
94	and thus, gettext support is available */
95	static bool
96	gettext_is_required (void)
97	{
98	LANGID lang = GetUserDefaultLangID ();
99	if (PRIMARYLANGID (lang) == LANG_ENGLISH)
100	return false;
101	return true;
102	}
103
104
105	static DWORD
106	do_swap_u32 (DWORD i)
107	{
108	return (i << 24) \| ((i & 0xff00) << 8) \| ((i >> 8) & 0xff00) \| (i >> 24);
109	}
110
111
112	/* The so called `hashpjw' function by P.J. Weinberger
113	[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
114	1986, 1987 Bell Telephone Laboratories, Inc.] */
115	static DWORD
116	hash_string (const char *str_param)
117	{
118	DWORD hval, g;
119	const char *str = str_param;
120
121	hval = 0;
122	while (*str != '\0') {
123	hval <<= 4;
124	hval += (DWORD) *str++;
125	g = hval & ((DWORD) 0xf << (HASHWORDBITS - 4));
126	if (g != 0) {
127	hval ^= g >> (HASHWORDBITS - 8);
128	hval ^= g;
129	}
130	}
131	return hval;
132	}
133
134
135	static gettext_domain_t
136	load_domain (const char *filename)
137	{
138	FILE *fp;
139	size_t size;
140	struct stat st;
141	struct mo_file_header *data = NULL;
142	gettext_domain_t domain = NULL;
143	size_t to_read;
144	char *read_ptr;
145
146	fp = fopen (filename, "rb");
147	if (!fp)
148	return NULL;
149	/* we must know about the size of the file */
150	if (fstat (fileno(fp), &st) \|\|
151	(size = (size_t)st.st_size) != (size_t)st.st_size \|\|
152	size < sizeof (struct mo_file_header)) {
153	fclose (fp);
154	return NULL;
155	}
156
157	data = (struct mo_file_header *) malloc (size);
158	if (!data)
159	BUG (0);
160
161	to_read = size;
162	read_ptr = (char *) data;
163	do {
164	size_t nb = fread (read_ptr, 1, to_read, fp);
165	if (nb < to_read) {
166	fclose (fp);
167	free (data);
168	return NULL; /* read error */
169	}
170	read_ptr += nb;
171	to_read -= nb;
172	} while (to_read > 0);
173	fclose (fp);
174
175	/* Using the magic number we can test whether it really is a message
176	* catalog file. */
177	if (data->magic != MAGIC && data->magic != MAGIC_SWAPPED) {
178	/* The magic number is wrong: not a message catalog file. */
179	free (data);
180	return NULL;
181	}
182
183	domain = (struct loaded_domain_s )calloc (1, sizeof domain);
184	if (!domain)
185	BUG (0);
186	domain->data = (char *) data;
187	domain->must_swap = data->magic != MAGIC;
188
189	/* Fill in the information about the available tables. */
190	switch (SWAPIT(domain->must_swap, data->revision)) {
191	case 0:
192	domain->nstrings = SWAPIT (domain->must_swap, data->nstrings);
193	domain->orig_tab = (struct string_desc *)
194	((char *) data + SWAPIT (domain->must_swap, data->orig_tab_offset));
195	domain->trans_tab = (struct string_desc *)
196	((char *) data + SWAPIT (domain->must_swap, data->trans_tab_offset));
197	domain->hash_size = SWAPIT (domain->must_swap, data->hash_tab_size);
198	domain->hash_tab = (DWORD *)
199	((char *) data + SWAPIT (domain->must_swap, data->hash_tab_offset));
200	break;
201
202	default: /* This is an invalid revision. */
203	free (data);
204	free (domain);
205	return NULL;
206	}
207
208	/* allocate an array to keep track of code page mappings */
209	domain->mapped = (char *)calloc (1, domain->nstrings);
210	if (!domain->mapped)
211	BUG (0);
212
213	domain->file_name = strdup (filename);
214	domain->modify_time = st.st_mtime;
215	return domain;
216	}
217
218
219	/* To avoid problems that the current directory is not the
220	* same folder the WinPT.exe is located in, we extract the
221	* module directory.
222	*/
223	char*
224	get_module_dir (char *buf, DWORD buflen)
225	{
226	if (buflen < 1 \|\| !GetModuleFileName (glob_hinst, buf, buflen-1))
227	return NULL;
228
229	size_t pos = strlen (buf);
230	while (pos > 0 && buf[--pos] != '\\')
231	;
232	buf[pos+1] = '\0';
233	return buf;
234	}
235
236
237	/* Returns a localisation name for a specific resource (file).
238	* For instance, lang=DE and file=winpt.chm will become winpt.DE.chm
239	*/
240	char*
241	get_locale_name (const char *file)
242	{
243	const char *lang = gettext_get_langid ();
244	char name, ext;
245	char *p, buf[MAX_PATH+1];
246
247	p = strrchr (file, '.');
248	if (p == NULL) {
249	p = new char[strlen(file)+strlen(lang)+2+1];
250	sprintf (p, "%s.%s", file, lang);
251	return p;
252	}
253	name = substr (file, 0, p - file);
254	ext = substr (file, p - file + 1, strlen(file));
255	p = get_module_dir (buf, MAX_PATH);
256	if (!p)
257	BUG (NULL);
258	StringBuffer s = p;
259	s = s + name + "." + lang + "." + ext;
260	p = s.getBufferCopy();
261	free_if_alloc (name);
262	free_if_alloc (ext);
263	return p;
264	}
265
266
267	/* Deallocate static resources. */
268	void
269	gettext_free_current_domain (void)
270	{
271	if (the_domain == NULL)
272	return;
273	free (the_domain->data);
274	free (the_domain->mapped);
275	free (the_domain->file_name);
276	free (the_domain);
277	the_domain = NULL;
278	}
279
280
281	/* Replace and release the old domain and assign a new domain then */
282	static void
283	gettext_update_domain (gettext_domain_t new_dom)
284	{
285	gettext_free_current_domain ();
286	the_domain = new_dom;
287	}
288
289
290	char* get_reg_entry_mo (void);
291
292	/* Fallback code which is used when no new NLS file were found.
293	Then we read the MODir registry key and check if a file named
294	'winpt.mo' exists in this directory. */
295	static gettext_domain_t
296	load_modir_domain (void)
297	{
298	char *modir = get_reg_entry_mo ();
299	if (!modir)
300	return NULL;
301	if (dir_exist_check (modir)) {
302	free_if_alloc (modir);
303	return NULL;
304	}
305	StringBuffer s = modir;
306	if (modir[strlen (modir)-1] != '\\')
307	s += "\\";
308	s += "winpt.mo";
309
310	gettext_domain_t domain = NULL;
311	const char *fname = s.getBuffer();
312	if (!file_exist_check (fname))
313	domain = load_domain (fname);
314	free_if_alloc (modir);
315	return domain;
316	}
317
318
319	/* Try to load the user domain, either from
320	the WinPT.exe directory or from the registry */
321	int
322	gettext_set_user_domain (void)
323	{
324	if (!gettext_is_required ())
325	return 0;
326
327	gettext_domain_t domain = NULL;
328	char *file = get_locale_name ("winpt.mo");
329	if (file && !file_exist_check (file))
330	domain = load_domain (file);
331	else
332	domain = load_modir_domain ();
333	free_if_alloc (file);
334	gettext_update_domain (domain);
335	return 0;
336	}
337
338
339	int
340	gettext_domain_needs_refresh (void)
341	{
342	struct stat st;
343
344	if (the_domain == NULL \|\| stat (the_domain->file_name, &st))
345	return 0;
346	/* '1' means that the MO file were modified in the mean time
347	and the application should reload the domain. */
348	if (st.st_mtime != the_domain->modify_time)
349	return 1;
350
351	return 0;
352	}
353
354	static const char*
355	get_string (gettext_domain_t domain, DWORD idx)
356	{
357	char *p = domain->data + SWAPIT(domain->must_swap,
358	domain->trans_tab[idx].offset);
359	if (!domain->mapped[idx])
360	domain->mapped[idx] = 1;
361	/* FIXME: all text is in UTF-8 and need to be converted to
362	the locale charset. But the caller does not free the data and
363	thus we will get a leak */
364	return (const char *)p;
365	}
366
367
368	const char *
369	gettext (const char *msgid)
370	{
371	size_t act = 0;
372	size_t top, bottom;
373
374	gettext_domain_t domain = the_domain;
375	if (domain == NULL)
376	goto not_found;
377
378	/* Locate the MSGID and its translation. */
379	if (domain->hash_size > 2 && domain->hash_tab) {
380	/* Use the hashing table. */
381	DWORD len = strlen (msgid);
382	DWORD hash_val = hash_string (msgid);
383	DWORD idx = hash_val % domain->hash_size;
384	DWORD incr = 1 + (hash_val % (domain->hash_size - 2));
385	DWORD nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
386
387	if (!nstr) /* Hash table entry is empty. */
388	goto not_found;
389
390	if (SWAPIT(domain->must_swap,
391	domain->orig_tab[nstr - 1].length) == len
392	&& !strcmp (msgid,
393	domain->data + SWAPIT (domain->must_swap,
394	domain->orig_tab[nstr - 1].offset)))
395	return get_string (domain, nstr - 1);
396	for(;;) {
397	if (idx >= domain->hash_size - incr)
398	idx -= domain->hash_size - incr;
399	else
400	idx += incr;
401	nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
402	if (!nstr)
403	goto not_found; /* Hash table entry is empty. */
404
405	if (SWAPIT (domain->must_swap,
406	domain->orig_tab[nstr - 1].length) == len
407	&& !strcmp (msgid,
408	domain->data + SWAPIT (domain->must_swap,
409	domain->orig_tab[nstr - 1].offset)))
410
411	return get_string (domain, nstr-1);
412	} /* NOTREACHED */
413	}
414
415	/* Now we try the default method: binary search in the sorted
416	array of messages. */
417	bottom = 0;
418	top = domain->nstrings;
419	while (bottom < top) {
420	act = (bottom + top) / 2;
421	int cmp_val = strcmp (msgid, domain->data + SWAPIT(domain->must_swap,
422	domain->orig_tab[act].offset));
423	if (cmp_val < 0)
424	top = act;
425	else if (cmp_val > 0)
426	bottom = act + 1;
427	else
428	return get_string (domain, act);
429	}
430
431	not_found:
432	return msgid;
433	}
434
435
436
437	/* Map the user specific language ID to a gettext conform language string.
438	English "en" is defined as the fallback.
439	Example: LANG_GERMAN -> "de" */
440	const char*
441	gettext_get_langid (void)
442	{
443	LANGID lang = GetUserDefaultLangID ();
444
445	for (int i=0; lang_list[i].id; i++) {
446	if (PRIMARYLANGID (lang) == lang_list[i].langid)
447	return lang_list[i].id;
448	}
449
450	return "en";
451	}
452
453
454	/* Take a table with control item IDs and their translation
455	and set each text to the translated value. */
456	void
457	gettext_localize_dialog (HWND dlg, struct gettext_tab_s tab, const char title)
458	{
459	for (int i=0; tab[i].trans != NULL; i++)
460	SetDlgItemText (dlg, tab[i].ctlid, tab[i].trans);
461	if (title != NULL)
462	SetWindowText (dlg, title);
463	}