webcit/gettext.c

   1 /*
   2  * $Id
   3  */
   4 /**
   5  * \defgroup LocaleHeaderParser Parse the browser http locale headers and set the NLS stuff.
   6  */
   7 /*@{*/
   8 /** we need _GNU_SOURCE for various functions arround the NLS-Stuff */
   9 #define _GNU_SOURCE
  10 #include "webcit.h"
  11 #include "webserver.h"
  12
  13 #ifdef ENABLE_NLS
  14
  15 #define NUM_LANGS 5 /**< how many different locales do we know? */
  16 #define SEARCH_LANG 20 /**< how many langs should we parse? */
  17
  18 /** actual supported locales */
  19 char *AvailLang[NUM_LANGS] = {
  20         "C",
  21         "en_US",
  22         "de_DE",
  23         "it_IT",
  24         "en_GB"
  25 };
  26
  27 locale_t wc_locales[NUM_LANGS]; /**< here we keep the parsed stuff */
  28
  29 /** Keep information about one locale */
  30 typedef struct _lang_pref{
  31         char lang[16];          /**< the language locale string */
  32         char region[16];        /**< the region locale string */
  33         long priority;          /**< which priority does it have */
  34         int availability;       /**< do we know it? */
  35         int selectedlang;       /**< is this the selected language? */
  36 } LangStruct;
  37
  38 /* \brief parse browser locale header
  39  * seems as most browsers just do a one after coma value even if more than 10 locales are available. Sample strings:
  40  * opera:
  41  * 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
  42  * Firefox
  43  * Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3'
  44  * Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3
  45  * 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
  46  * \param LocaleString the string from the browser http headers
  47  */
  48
  49 void httplang_to_locale(char *LocaleString)
  50 {
  51         LangStruct wanted_locales[SEARCH_LANG];
  52         LangStruct *ls;
  53
  54         int i = 0;
  55         int j = 0;
  56         size_t len = strlen(LocaleString);
  57         long prio;
  58         int av;
  59         int nBest;
  60         int nParts;
  61         char *search = (char *) malloc(len);
  62         // locale_t my_Locale;
  63         // locale_t my_Empty_Locale;
  64
  65         memcpy(search, LocaleString, len);
  66         search[len] = '\0';
  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                 {
 135                         ls=&wanted_locales[i];
 136                         if ((ls->availability<=0)&&
 137                                 (av<ls->availability)&&
 138                                 (prio<ls->priority)&&
 139                                 (ls->selectedlang!=-1)){
 140                                 nBest=ls->selectedlang;
 141                                 av=ls->availability;
 142                                 prio=ls->priority;
 143                         }
 144                 }
 145         if (nBest==-1) /** fall back to C */
 146                 nBest=0;
 147         WC->selected_language=nBest;
 148         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 149         //      set_selected_language(selected_locale);
 150 }
 151
 152 /* TODO: we skip the language weightening 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\" 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         if (WC->selected_language < 0) return;
 230         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 231         textdomain(textdomain(NULL));                   /** clear the cache */
 232 }
 233
 234 /**
 235  * \brief Deactivate the selected language for this session.
 236  */
 237 void stop_selected_language(void) {
 238         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 239         textdomain(textdomain(NULL));                   /** clear the cache */
 240 }
 241
 242
 243 /**
 244  * \brief Create a locale_t for each available language
 245  */
 246 void initialize_locales(void) {
 247         int i;
 248         locale_t Empty_Locale;
 249         char buf[32];
 250
 251         /* create default locale */
 252         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 253
 254         for (i = 0; i < NUM_LANGS; ++i) {
 255                 sprintf(buf, "%s.UTF8", AvailLang[i]);
 256                 wc_locales[i] = newlocale(LC_MESSAGES_MASK /* |LC_TIME_MASK FIXME */ ,
 257                         buf,
 258                         Empty_Locale
 259                 );
 260         }
 261 }
 262
 263
 264 #else   /* ENABLE_NLS */
 265 /** \brief dummy for non NLS enabled systems */
 266 void offer_languages(void) {
 267         wprintf("English (US)");
 268 }
 269
 270 /** \brief dummy for non NLS enabled systems */
 271 void set_selected_language(char *lang) {
 272 }
 273
 274 /** \brief dummy for non NLS enabled systems */
 275 void go_selected_language(void) {
 276 }
 277
 278 /** \brief dummy for non NLS enabled systems */
 279 void stop_selected_language(void) {
 280 }
 281
 282 #endif  /* ENABLE_NLS */
 283
 284
 285 /*@}*/