webcit/gettext.c

   1 /*
   2  * $Id
   3  */
   4 /**
   5  * \defgroup LocaleHeaderParser Parse the browser http locale headers and set the NLS stuff.
   6  * \ingroup WebcitHttpServer
   7  */
   8 /*@{*/
   9 #include "webcit.h"
  10 #include "webserver.h"
  11
  12 #ifdef ENABLE_NLS
  13
  14 #define NUM_LANGS 10 /**< how many different locales do we know? */
  15 #define SEARCH_LANG 20 /**< how many langs should we parse? */
  16
  17 /** actual supported locales */
  18 char *AvailLang[NUM_LANGS] = {
  19         "C",
  20         "en_US",
  21         "de_DE",
  22         "it_IT",
  23         "es_ES",
  24         "en_GB",
  25         "da_DK",
  26         "fr_FR",
  27         "nl_NL",
  28         "pt_BR"
  29 };
  30
  31 #ifdef HAVE_USELOCALE
  32 locale_t wc_locales[NUM_LANGS]; /**< here we keep the parsed stuff */
  33 #endif
  34
  35 /** Keep information about one locale */
  36 typedef struct _lang_pref{
  37         char lang[16];          /**< the language locale string */
  38         char region[16];        /**< the region locale string */
  39         long priority;          /**< which priority does it have */
  40         int availability;       /**< do we know it? */
  41         int selectedlang;       /**< is this the selected language? */
  42 } LangStruct;
  43
  44 /* \brief parse browser locale header
  45  * seems as most browsers just do a one after coma value even if more than 10 locales are available. Sample strings:
  46  * opera:
  47  * Accept-Language: sq;q=1.0,de;q=0.9,as;q=0.8,ar;q=0.7,bn;q=0.6,zh-cn;q=0.5,kn;q=0.4,ch;q=0.3,fo;q=0.2,gn;q=0.1,ce;q=0.1,ie;q=0.1
  48  * Firefox
  49  * Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3'
  50  * Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3
  51  * Accept-Language: de,en-us;q=0.9,it;q=0.9,de-de;q=0.8,en-ph;q=0.7,de-at;q=0.7,zh-cn;q=0.6,cy;q=0.5,ar-om;q=0.5,en-tt;q=0.4,xh;q=0.3,nl-be;q=0.3,cs;q=0.2,sv;q=0.1,tk;q=0.1
  52  * \param LocaleString the string from the browser http headers
  53  */
  54
  55 void httplang_to_locale(char *LocaleString)
  56 {
  57         LangStruct wanted_locales[SEARCH_LANG];
  58         LangStruct *ls;
  59
  60         int i = 0;
  61         int j = 0;
  62         /* size_t len = strlen(LocaleString); */
  63         long prio;
  64         int av;
  65         int nBest;
  66         int nParts;
  67         char search[1024];
  68
  69         safestrncpy(search, LocaleString, sizeof search);
  70         nParts=num_tokens(search,',');
  71         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
  72         {
  73                         char buf[16];
  74                         char sbuf[16];
  75                         char lbuf[16];
  76                         int blen;
  77
  78                         ls=&wanted_locales[i];
  79
  80                         extract_token(&buf[0],search, i,',',16);
  81                         /** we are searching, if this list item has something like ;q=n*/
  82                         if (num_tokens(&buf[0],'=')>1) {
  83                                 int sbuflen, k;
  84                                 extract_token(&sbuf[0],&buf[0], 1,'=',16);
  85                                 sbuflen=strlen(&sbuf[0]);
  86                                 for (k=0; k<sbuflen; k++) if (sbuf[k]=='.') sbuf[k]='0';
  87                                 ls->priority=atol(&sbuf[0]);
  88                         }
  89                         else {
  90                                 ls->priority=1000;
  91                         }
  92                         /** get the locale part */
  93                         extract_token(&sbuf[0],&buf[0],0,';',16);
  94                         /** get the lang part, which should be allways there */
  95                         extract_token(&ls->lang[0],&sbuf[0],0,'-',16);
  96                         /** get the area code if any. */
  97                         if (num_tokens(&sbuf[0],'-')>1) {
  98                                 extract_token(&ls->region[0],&sbuf[0],1,'-',16);
  99                         }
 100                         else { /** no ara code? use lang code */
 101                                 blen=strlen(&ls->lang[0]);
 102                                 memcpy(&ls->region[0], ls->lang,blen);
 103                                 ls->region[blen]='\0';
 104                         } /** area codes are uppercase */
 105                         blen=strlen(&ls->region[0]);
 106                         for (j=0; j<blen; j++)
 107                                 {
 108                                         int chars=toupper(ls->region[j]);
 109                                         ls->region[j]=(char)chars;/** \todo ?! */
 110                                 }
 111                         sprintf(&lbuf[0],"%s_%s",&ls->lang[0],&ls->region[0]);
 112
 113                         /** check if we have this lang */
 114                         ls->availability=1;
 115                         ls->selectedlang=-1;
 116                         for (j=0; j<NUM_LANGS; j++) {
 117                                 int result;
 118                                 /** match against the LANG part */
 119                                 result=strcasecmp(&ls->lang[0], AvailLang[j]);
 120                                 if ((result<0)&&(result<ls->availability)){
 121                                         ls->availability=result;
 122                                         ls->selectedlang=j;
 123                                 }
 124                                 /** match against lang and locale */
 125                                 if (0==strcasecmp(&lbuf[0], AvailLang[j])){
 126                                         ls->availability=0;
 127                                         ls->selectedlang=j;
 128                                         j=NUM_LANGS;
 129                                 }
 130                         }
 131         }
 132
 133         prio=0;
 134         av=-1000;
 135         nBest=-1;
 136         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++) {
 137                 ls=&wanted_locales[i];
 138                 if ((ls->availability<=0)&&
 139                    (av<ls->availability)&&
 140                    (prio<ls->priority)&&
 141                    (ls->selectedlang!=-1)) {
 142                         nBest=ls->selectedlang;
 143                         av=ls->availability;
 144                         prio=ls->priority;
 145                 }
 146         }
 147         if (nBest == -1) {
 148                 /** fall back to C */
 149                 nBest=0;
 150         }
 151         WC->selected_language=nBest;
 152         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 153 }
 154
 155 /* TODO: we skip the language weighting so far. */
 156 /* Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3' */
 157 /* Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3 */
 158 //void httplang_to_locale(char *LocaleString)
 159 //{
 160 //      char selected_locale[16];
 161 //      int i, j;
 162 //      char lang[64];
 163 //      int num_accept = 0;
 164 //
 165 //      lprintf(9, "languageAccept: %s\n", LocaleString);
 166 //
 167 //      strcpy(selected_locale, "C");
 168 //      num_accept = num_tokens(LocaleString, ',');
 169 //
 170 //      for (i=num_accept-1; i>=0; --i) {
 171 //              extract_token(lang, LocaleString, i, ',', sizeof lang);
 172 //
 173 //              /* Strip out the weights; we don't use them.  Also convert
 174 //               * hyphens to underscores.
 175 //               */
 176 //              for (j=0; j<strlen(lang); ++j) {
 177 //                      if (lang[j] == '-') lang[j] = '_';
 178 //                      if (lang[j] == ';') lang[j] = 0;
 179 //              }
 180 //
 181 //              for (j=0; j<NUM_LANGS; ++j) {
 182 //                      if (!strncasecmp(lang, AvailLang[j], strlen(lang))) {
 183 //                              strcpy(selected_locale, AvailLang[j]);
 184 //                      }
 185 //              }
 186 //      }
 187 //
 188 //      lprintf(9, "language found: %s\n", selected_locale);
 189 //      set_selected_language(selected_locale);
 190 //}
 191
 192
 193 /**
 194  * \brief show the language chooser on the login dialog
 195  * depending on the browser locale change the sequence of the
 196  * language chooser.
 197  */
 198 void offer_languages(void) {
 199         int i;
 200
 201         wprintf("<select name=\"language\" id=\"lname\" size=\"1\">\n");
 202
 203         for (i=0; i < NUM_LANGS; ++i) {
 204 #ifndef HAVE_USELOCALE
 205                 if (strcmp(AvailLang[i], getenv("LANG")) == 0)
 206 #endif
 207                 wprintf("<option %s value=%s>%s</option>\n",
 208                         ((WC->selected_language == i) ? "selected" : ""),
 209                         AvailLang[i],
 210                         AvailLang[i]
 211                 );
 212         }
 213
 214         wprintf("</select>\n");
 215 }
 216
 217 /**
 218  * \brief Set the selected language for this session.
 219  * \param lang the locale to set.
 220  */
 221 void set_selected_language(char *lang) {
 222         int i;
 223 #ifdef HAVE_USELOCALE
 224         for (i=0; i<NUM_LANGS; ++i) {
 225                 if (!strcasecmp(lang, AvailLang[i])) {
 226                         WC->selected_language = i;
 227                 }
 228         }
 229 #endif
 230 }
 231
 232 /**
 233  * \brief Activate the selected language for this session.
 234  */
 235 void go_selected_language(void) {
 236 #ifdef HAVE_USELOCALE
 237         if (WC->selected_language < 0) return;
 238         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 239         textdomain(textdomain(NULL));                   /** clear the cache */
 240 #else
 241         char *language;
 242
 243         language = getenv("LANG");
 244         setlocale(LC_MESSAGES, language);
 245 #endif
 246 }
 247
 248 /**
 249  * \brief Deactivate the selected language for this session.
 250  */
 251 void stop_selected_language(void) {
 252 #ifdef HAVE_USELOCALE
 253         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 254         textdomain(textdomain(NULL));                   /** clear the cache */
 255 #endif
 256 }
 257
 258 void preset_locale(void)
 259 {
 260 #ifndef HAVE_USELOCALE
 261 #ifdef HAVE_GETTEXT
 262         char *language;
 263
 264         lprintf(9, "Nailing locale to %s\n", getenv("LANG"));
 265         language = getenv("LANG");
 266         setlocale(LC_MESSAGES, language);
 267 #endif
 268 #endif
 269 }
 270 /**
 271  * \brief Create a locale_t for each available language
 272  */
 273 void initialize_locales(void) {
 274         int i;
 275         char buf[32];
 276
 277 #ifdef HAVE_USELOCALE
 278         locale_t Empty_Locale;
 279
 280         /* create default locale */
 281         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 282 #endif
 283
 284         for (i = 0; i < NUM_LANGS; ++i) {
 285                 if (i == 0) {
 286                         sprintf(buf, "%s", AvailLang[i]);       // locale 0 (C) is ascii, not utf-8
 287                 }
 288                 else {
 289                         sprintf(buf, "%s.UTF8", AvailLang[i]);
 290                 }
 291 #ifdef HAVE_USELOCALE
 292                 wc_locales[i] = newlocale(
 293                         (LC_MESSAGES_MASK|LC_TIME_MASK),
 294                         buf,
 295                         (((i > 0) && (wc_locales[0] != NULL)) ? wc_locales[0] : Empty_Locale)
 296                 );
 297                 if (wc_locales[i] == NULL) {
 298                         lprintf(1, "Error configuring locale for %s: %s\n",
 299                                 buf,
 300                                 strerror(errno)
 301                         );
 302                 }
 303                 else {
 304                         lprintf(3, "Configured available locale: %s\n", buf);
 305                 }
 306 #endif
 307         }
 308 }
 309
 310
 311 #else   /* ENABLE_NLS */
 312 /** \brief dummy for non NLS enabled systems */
 313 void offer_languages(void) {
 314         wprintf("English (US)");
 315 }
 316
 317 /** \brief dummy for non NLS enabled systems */
 318 void set_selected_language(char *lang) {
 319 }
 320
 321 /** \brief dummy for non NLS enabled systems */
 322 void go_selected_language(void) {
 323 }
 324
 325 /** \brief dummy for non NLS enabled systems */
 326 void stop_selected_language(void) {
 327 }
 328
 329 void preset_locale(void)
 330 {
 331 }
 332 #endif  /* ENABLE_NLS */
 333
 334
 335 /*@}*/