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 4 /**< 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 };
  25
  26 locale_t wc_locales[NUM_LANGS]; /**< here we keep the parsed stuff */
  27
  28 /** Keep information about one locale */
  29 typedef struct _lang_pref{
  30         char lang[16];          /**< the language locale string */
  31         char region[16];        /**< the region locale string */
  32         long priority;          /**< which priority does it have */
  33         int availability;       /**< do we know it? */
  34         int selectedlang;       /**< is this the selected language? */
  35 } LangStruct;
  36
  37 /* \brief parse browser locale header
  38  * seems as most browsers just do a one after coma value even if more than 10 locales are available. Sample strings:
  39  * opera:
  40  * 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
  41  * Firefox
  42  * Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3'
  43  * Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3
  44  * 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
  45  * \param LocaleString the string from the browser http headers
  46  */
  47
  48 void httplang_to_locale(char *LocaleString)
  49 {
  50         LangStruct wanted_locales[SEARCH_LANG];
  51         LangStruct *ls;
  52
  53         int i = 0;
  54         int j = 0;
  55         size_t len = strlen(LocaleString);
  56         long prio;
  57         int av;
  58         int nBest;
  59         int nParts;
  60         char *search = (char *) malloc(len);
  61         // locale_t my_Locale;
  62         // locale_t my_Empty_Locale;
  63
  64         memcpy(search, LocaleString, len);
  65         search[len] = '\0';
  66         nParts=num_tokens(search,',');
  67         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
  68         {
  69                         char buf[16];
  70                         char sbuf[16];
  71                         char lbuf[16];
  72                         int blen;
  73
  74                         ls=&wanted_locales[i];
  75
  76                         extract_token(&buf[0],search, i,',',16);
  77                         /** we are searching, if this list item has something like ;q=n*/
  78                         if (num_tokens(&buf[0],'=')>1) {
  79                                 int sbuflen, k;
  80                                 extract_token(&sbuf[0],&buf[0], 1,'=',16);
  81                                 sbuflen=strlen(&sbuf[0]);
  82                                 for (k=0; k<sbuflen; k++) if (sbuf[k]=='.') sbuf[k]='0';
  83                                 ls->priority=atol(&sbuf[0]);
  84                         }
  85                         else {
  86                                 ls->priority=1000;
  87                         }
  88                         /** get the locale part */
  89                         extract_token(&sbuf[0],&buf[0],0,';',16);
  90                         /** get the lang part, which should be allways there */
  91                         extract_token(&ls->lang[0],&sbuf[0],0,'-',16);
  92                         /** get the area code if any. */
  93                         if (num_tokens(&sbuf[0],'-')>1) {
  94                                 extract_token(&ls->region[0],&sbuf[0],1,'-',16);
  95                         }
  96                         else { /** no ara code? use lang code */
  97                                 blen=strlen(&ls->lang[0]);
  98                                 memcpy(&ls->region[0], ls->lang,blen);
  99                                 ls->region[blen]='\0';
 100                         } /** area codes are uppercase */
 101                         blen=strlen(&ls->region[0]);
 102                         for (j=0; j<blen; j++)
 103                                 {
 104                                         int chars=toupper(ls->region[j]);
 105                                         ls->region[j]=(char)chars;/** \todo ?! */
 106                                 }
 107                         sprintf(&lbuf[0],"%s_%s",&ls->lang[0],&ls->region[0]);
 108
 109                         /** check if we have this lang */
 110                         ls->availability=1;
 111                         ls->selectedlang=-1;
 112                         for (j=0; j<NUM_LANGS; j++) {
 113                                 int result;
 114                                 /** match against the LANG part */
 115                                 result=strcasecmp(&ls->lang[0], AvailLang[j]);
 116                                 if ((result<0)&&(result<ls->availability)){
 117                                         ls->availability=result;
 118                                         ls->selectedlang=j;
 119                                 }
 120                                 /** match against lang and locale */
 121                                 if (0==strcasecmp(&lbuf[0], AvailLang[j])){
 122                                         ls->availability=0;
 123                                         ls->selectedlang=j;
 124                                         j=NUM_LANGS;
 125                                 }
 126                         }
 127         }
 128
 129         prio=0;
 130         av=-1000;
 131         nBest=-1;
 132         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
 133                 {
 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) /** fall back to C */
 145                 nBest=0;
 146         WC->selected_language=nBest;
 147         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 148         //      set_selected_language(selected_locale);
 149 }
 150
 151 /* TODO: we skip the language weightening so far. */
 152 /* Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3' */
 153 /* Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3 */
 154 //void httplang_to_locale(char *LocaleString)
 155 //{
 156 //      char selected_locale[16];
 157 //      int i, j;
 158 //      char lang[64];
 159 //      int num_accept = 0;
 160 //
 161 //      lprintf(9, "languageAccept: %s\n", LocaleString);
 162 //
 163 //      strcpy(selected_locale, "C");
 164 //      num_accept = num_tokens(LocaleString, ',');
 165 //
 166 //      for (i=num_accept-1; i>=0; --i) {
 167 //              extract_token(lang, LocaleString, i, ',', sizeof lang);
 168 //
 169 //              /* Strip out the weights; we don't use them.  Also convert
 170 //               * hyphens to underscores.
 171 //               */
 172 //              for (j=0; j<strlen(lang); ++j) {
 173 //                      if (lang[j] == '-') lang[j] = '_';
 174 //                      if (lang[j] == ';') lang[j] = 0;
 175 //              }
 176 //
 177 //              for (j=0; j<NUM_LANGS; ++j) {
 178 //                      if (!strncasecmp(lang, AvailLang[j], strlen(lang))) {
 179 //                              strcpy(selected_locale, AvailLang[j]);
 180 //                      }
 181 //              }
 182 //      }
 183 //
 184 //      lprintf(9, "language found: %s\n", selected_locale);
 185 //      set_selected_language(selected_locale);
 186 //}
 187
 188
 189 /**
 190  * \brief show the language chooser on the login dialog
 191  * depending on the browser locale change the sequence of the
 192  * language chooser.
 193  */
 194 void offer_languages(void) {
 195         int i;
 196
 197         wprintf("<select name=\"language\" size=\"1\">\n");
 198
 199         for (i=0; i < NUM_LANGS; ++i) {
 200                 wprintf("<option %s value=%s>%s</option>\n",
 201                         ((WC->selected_language == i) ? "selected" : ""),
 202                         AvailLang[i],
 203                         AvailLang[i]
 204                 );
 205         }
 206
 207         wprintf("</select>\n");
 208 }
 209
 210 /**
 211  * \brief Set the selected language for this session.
 212  * \param lang the locale to set.
 213  */
 214 void set_selected_language(char *lang) {
 215         int i;
 216
 217         for (i=0; i<NUM_LANGS; ++i) {
 218                 if (!strcasecmp(lang, AvailLang[i])) {
 219                         WC->selected_language = i;
 220                 }
 221         }
 222 }
 223
 224 /**
 225  * \brief Activate the selected language for this session.
 226  */
 227 void go_selected_language(void) {
 228         if (WC->selected_language < 0) return;
 229         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 230         textdomain(textdomain(NULL));                   /** clear the cache */
 231 }
 232
 233 /**
 234  * \brief Deactivate the selected language for this session.
 235  */
 236 void stop_selected_language(void) {
 237         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 238         textdomain(textdomain(NULL));                   /** clear the cache */
 239 }
 240
 241
 242 /**
 243  * \brief Create a locale_t for each available language
 244  */
 245 void initialize_locales(void) {
 246         int i;
 247         locale_t Empty_Locale;
 248         char buf[32];
 249
 250         /* create default locale */
 251         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 252
 253         for (i = 0; i < NUM_LANGS; ++i) {
 254                 sprintf(buf, "%s.UTF8", AvailLang[i]);
 255                 wc_locales[i] = newlocale(LC_MESSAGES_MASK /* |LC_TIME_MASK FIXME */ ,
 256                         buf,
 257                         Empty_Locale
 258                 );
 259         }
 260 }
 261
 262
 263 #else   /* ENABLE_NLS */
 264 /** \brief dummy for non NLS enabled systems */
 265 void offer_languages(void) {
 266         wprintf("English (US)");
 267 }
 268
 269 /** \brief dummy for non NLS enabled systems */
 270 void set_selected_language(char *lang) {
 271 }
 272
 273 /** \brief dummy for non NLS enabled systems */
 274 void go_selected_language(void) {
 275 }
 276
 277 /** \brief dummy for non NLS enabled systems */
 278 void stop_selected_language(void) {
 279 }
 280
 281 #endif  /* ENABLE_NLS */
 282
 283
 284 /*@}*/