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