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vdr/i18n.c

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/*
* i18n.c: Internationalization
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: i18n.c 5.2 2022/12/01 20:57:12 kls Exp $
*/
/*
* In case an English phrase is used in more than one context (and might need
* different translations in other languages) it can be preceded with an
* arbitrary string to describe its context, separated from the actual phrase
* by a '$' character (see for instance "Button$Stop" vs. "Stop").
* Of course this means that no English phrase may contain the '$' character!
* If this should ever become necessary, the existing '$' would have to be
* replaced with something different...
*/
#include "i18n.h"
#include <ctype.h>
#include <libintl.h>
#include <locale.h>
#include <unistd.h>
#include "tools.h"
// TRANSLATORS: The name of the language, as written natively
const char *LanguageName = trNOOP("LanguageName$English");
// TRANSLATORS: The 3-letter code of the language
const char *LanguageCode = trNOOP("LanguageCode$eng");
// List of known language codes with aliases.
// Actually we could list all codes from http://www.loc.gov/standards/iso639-2
// here, but that would be several hundreds - and for most of them it's unlikely
// they're ever going to be used...
const char *LanguageCodeList[] = {
"eng,dos",
"deu,ger",
"alb,sqi",
"ara",
"bos",
"bul",
"cat,cln",
"chi,zho",
"cze,ces",
"dan",
"dut,nla,nld",
"ell,gre",
"esl,spa",
"est",
"eus,baq",
"fin,suo",
"fra,fre",
"hrv",
"hun",
"iri,gle", // 'NorDig'
"ita",
"jpn",
"lav",
"lit",
"ltz",
"mac,mkd",
"mlt",
"nor",
"pol",
"por",
"rom,rum",
"rus",
"slk,slo",
"slv",
"smi", // 'NorDig' Sami language (Norway, Sweden, Finnland, Russia)
"srb,srp,scr,scc",
"sve,swe",
"tur",
"ukr",
NULL
};
struct tSpecialLc { const char *Code; const char *Name; };
const struct tSpecialLc SpecialLanguageCodeList[] = {
{ "qaa", trNOOP("LanguageName$original language (qaa)") },
{ "qad", trNOOP("LanguageName$audio description (qad)") },
{ "qks", trNOOP("LanguageName$clear speech (qks)") },
{ "mis", trNOOP("LanguageName$uncoded languages (mis)") },
{ "mul", trNOOP("LanguageName$multiple languages (mul)") },
{ "nar", trNOOP("LanguageName$narrative (nar)") },
{ "und", trNOOP("LanguageName$undetermined (und)") },
{ "zxx", trNOOP("LanguageName$no linguistic content (zxx)") },
{ NULL, NULL }
};
static cString I18nLocaleDir;
static cStringList LanguageLocales;
static cStringList LanguageNames;
static cStringList LanguageCodes;
static int NumLocales = 1;
static int NumLanguages = 1;
static int CurrentLanguage = 0;
static bool ContainsCode(const char *Codes, const char *Code)
{
while (*Codes) {
int l = 0;
for ( ; l < 3 && Code[l]; l++) {
if (Codes[l] != tolower(Code[l]))
break;
}
if (l == 3)
return true;
Codes++;
}
return false;
}
static const char *SkipContext(const char *s)
{
const char *p = strchr(s, '$');
return p ? p + 1 : s;
}
static void SetEnvLanguage(const char *Locale)
{
setenv("LANGUAGE", Locale, 1);
extern int _nl_msg_cat_cntr;
++_nl_msg_cat_cntr;
}
static void SetLanguageNames(void)
{
// Update the translation for special language codes:
int i = NumLanguages;
for (const struct tSpecialLc *slc = SpecialLanguageCodeList; slc->Code; slc++) {
const char *TranslatedName = gettext(slc->Name);
free(LanguageNames[i]);
LanguageNames[i++] = strdup(TranslatedName != slc->Name ? TranslatedName : SkipContext(slc->Name));
}
}
void I18nInitialize(const char *LocaleDir)
{
I18nLocaleDir = LocaleDir;
LanguageLocales.Append(strdup(I18N_DEFAULT_LOCALE));
LanguageNames.Append(strdup(SkipContext(LanguageName)));
LanguageCodes.Append(strdup(LanguageCodeList[0]));
textdomain("vdr");
bindtextdomain("vdr", I18nLocaleDir);
cFileNameList Locales(I18nLocaleDir, true);
if (Locales.Size() > 0) {
char *OldLocale = strdup(setlocale(LC_MESSAGES, NULL));
for (int i = 0; i < Locales.Size(); i++) {
cString FileName = cString::sprintf("%s/%s/LC_MESSAGES/vdr.mo", *I18nLocaleDir, Locales[i]);
if (access(FileName, F_OK) == 0) { // found a locale with VDR texts
if (NumLocales < I18N_MAX_LANGUAGES - 1) {
SetEnvLanguage(Locales[i]);
const char *TranslatedLanguageName = gettext(LanguageName);
if (TranslatedLanguageName != LanguageName) {
NumLocales++;
if (strstr(OldLocale, Locales[i]) == OldLocale)
CurrentLanguage = LanguageLocales.Size();
LanguageLocales.Append(strdup(Locales[i]));
LanguageNames.Append(strdup(TranslatedLanguageName));
const char *Code = gettext(LanguageCode);
for (const char **lc = LanguageCodeList; *lc; lc++) {
if (ContainsCode(*lc, Code)) {
Code = *lc;
break;
}
}
LanguageCodes.Append(strdup(Code));
}
}
else {
esyslog("ERROR: too many locales - increase I18N_MAX_LANGUAGES!");
break;
}
}
}
SetEnvLanguage(LanguageLocales[CurrentLanguage]);
free(OldLocale);
dsyslog("found %d locales in %s", NumLocales - 1, *I18nLocaleDir);
}
// Prepare any known language codes for which there was no locale:
NumLanguages = NumLocales;
for (const char **lc = LanguageCodeList; *lc; lc++) {
bool Found = false;
for (int i = 0; i < LanguageCodes.Size(); i++) {
if (strcmp(*lc, LanguageCodes[i]) == 0) {
Found = true;
break;
}
}
if (!Found) {
dsyslog("no locale for language code '%s'", *lc);
NumLanguages++;
LanguageLocales.Append(strdup(I18N_DEFAULT_LOCALE));
LanguageNames.Append(strdup(*lc));
LanguageCodes.Append(strdup(*lc));
}
}
// Add special language codes and names:
for (const struct tSpecialLc *slc = SpecialLanguageCodeList; slc->Code; slc++) {
const char *TranslatedName = gettext(slc->Name);
LanguageNames.Append(strdup( TranslatedName != slc->Name ? TranslatedName : SkipContext(slc->Name)));
LanguageCodes.Append(strdup(slc->Code));
}
}
void I18nRegister(const char *Plugin)
{
cString Domain = cString::sprintf("vdr-%s", Plugin);
bindtextdomain(Domain, I18nLocaleDir);
}
void I18nSetLocale(const char *Locale)
{
if (Locale && *Locale) {
int i = LanguageLocales.Find(Locale);
if (i >= 0) {
CurrentLanguage = i;
SetEnvLanguage(Locale);
SetLanguageNames();
}
else
dsyslog("unknown locale: '%s'", Locale);
}
}
int I18nCurrentLanguage(void)
{
return CurrentLanguage;
}
void I18nSetLanguage(int Language)
{
if (Language < NumLanguages) {
CurrentLanguage = Language;
I18nSetLocale(I18nLocale(CurrentLanguage));
}
}
int I18nNumLanguagesWithLocale(void)
{
return NumLocales;
}
const cStringList *I18nLanguages(void)
{
return &LanguageNames;
}
const char *I18nTranslate(const char *s, const char *Plugin)
{
if (!s)
return s;
if (CurrentLanguage) {
const char *t = Plugin ? dgettext(Plugin, s) : gettext(s);
if (t != s)
return t;
}
return SkipContext(s);
}
const char *I18nLocale(int Language)
{
return 0 <= Language && Language < LanguageLocales.Size() ? LanguageLocales[Language] : NULL;
}
const char *I18nLanguageCode(int Language)
{
return 0 <= Language && Language < LanguageCodes.Size() ? LanguageCodes[Language] : NULL;
}
int I18nLanguageIndex(const char *Code)
{
for (int i = 0; i < LanguageCodes.Size(); i++) {
if (ContainsCode(LanguageCodes[i], Code))
return i;
}
//dsyslog("unknown language code: '%s'", Code);
return -1;
}
const char *I18nNormalizeLanguageCode(const char *Code)
{
for (int i = 0; i < 3; i++) {
if (Code[i]) {
// ETSI EN 300 468 defines language codes as consisting of three letters
// according to ISO 639-2. This means that they are supposed to always consist
// of exactly three letters in the range a-z - no digits, UTF-8 or other
// funny characters. However, some broadcasters apparently don't have a
// copy of the DVB standard (or they do, but are perhaps unable to read it),
// so they put all sorts of non-standard stuff into the language codes,
// like nonsense as "2ch" or "A 1" (yes, they even go as far as using
// blanks!). Such things should go into the description of the EPG event's
// ComponentDescriptor.
// So, as a workaround for this broadcaster stupidity, let's ignore
// language codes with unprintable characters...
if (!isprint(Code[i])) {
//dsyslog("invalid language code: '%s'", Code);
return "???";
}
// ...and replace blanks with underlines (ok, this breaks the 'const'
// of the Code parameter - but hey, it's them who started this):
if (Code[i] == ' ')
*((char *)&Code[i]) = '_';
}
else
break;
}
int n = I18nLanguageIndex(Code);
return n >= 0 ? I18nLanguageCode(n) : Code;
}
bool I18nIsPreferredLanguage(int *PreferredLanguages, const char *LanguageCode, int &OldPreference, int *Position)
{
int pos = 1;
bool found = false;
while (LanguageCode) {
int LanguageIndex = I18nLanguageIndex(LanguageCode);
for (int i = 0; i < LanguageCodes.Size(); i++) {
if (PreferredLanguages[i] < 0)
break; // the language is not a preferred one
if (PreferredLanguages[i] == LanguageIndex) {
if (OldPreference < 0 || i < OldPreference) {
OldPreference = i;
if (Position)
*Position = pos;
found = true;
break;
}
}
}
if ((LanguageCode = strchr(LanguageCode, '+')) != NULL) {
LanguageCode++;
pos++;
}
else if (pos == 1 && Position)
*Position = 0;
}
if (OldPreference < 0) {
OldPreference = LanguageCodes.Size(); // higher than the maximum possible value
return true; // if we don't find a preferred one, we take the first one
}
return found;
}
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