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