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 6 /**< 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 };
  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
  63         memcpy(search, LocaleString, len);
  64         search[len] = '\0';
  65         nParts=num_tokens(search,',');
  66         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
  67         {
  68                         char buf[16];
  69                         char sbuf[16];
  70                         char lbuf[16];
  71                         int blen;
  72
  73                         ls=&wanted_locales[i];
  74
  75                         extract_token(&buf[0],search, i,',',16);
  76                         /** we are searching, if this list item has something like ;q=n*/
  77                         if (num_tokens(&buf[0],'=')>1) {
  78                                 int sbuflen, k;
  79                                 extract_token(&sbuf[0],&buf[0], 1,'=',16);
  80                                 sbuflen=strlen(&sbuf[0]);
  81                                 for (k=0; k<sbuflen; k++) if (sbuf[k]=='.') sbuf[k]='0';
  82                                 ls->priority=atol(&sbuf[0]);
  83                         }
  84                         else {
  85                                 ls->priority=1000;
  86                         }
  87                         /** get the locale part */
  88                         extract_token(&sbuf[0],&buf[0],0,';',16);
  89                         /** get the lang part, which should be allways there */
  90                         extract_token(&ls->lang[0],&sbuf[0],0,'-',16);
  91                         /** get the area code if any. */
  92                         if (num_tokens(&sbuf[0],'-')>1) {
  93                                 extract_token(&ls->region[0],&sbuf[0],1,'-',16);
  94                         }
  95                         else { /** no ara code? use lang code */
  96                                 blen=strlen(&ls->lang[0]);
  97                                 memcpy(&ls->region[0], ls->lang,blen);
  98                                 ls->region[blen]='\0';
  99                         } /** area codes are uppercase */
 100                         blen=strlen(&ls->region[0]);
 101                         for (j=0; j<blen; j++)
 102                                 {
 103                                         int chars=toupper(ls->region[j]);
 104                                         ls->region[j]=(char)chars;/** \todo ?! */
 105                                 }
 106                         sprintf(&lbuf[0],"%s_%s",&ls->lang[0],&ls->region[0]);
 107
 108                         /** check if we have this lang */
 109                         ls->availability=1;
 110                         ls->selectedlang=-1;
 111                         for (j=0; j<NUM_LANGS; j++) {
 112                                 int result;
 113                                 /** match against the LANG part */
 114                                 result=strcasecmp(&ls->lang[0], AvailLang[j]);
 115                                 if ((result<0)&&(result<ls->availability)){
 116                                         ls->availability=result;
 117                                         ls->selectedlang=j;
 118                                 }
 119                                 /** match against lang and locale */
 120                                 if (0==strcasecmp(&lbuf[0], AvailLang[j])){
 121                                         ls->availability=0;
 122                                         ls->selectedlang=j;
 123                                         j=NUM_LANGS;
 124                                 }
 125                         }
 126         }
 127
 128         prio=0;
 129         av=-1000;
 130         nBest=-1;
 131         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
 132                 {
 133                         ls=&wanted_locales[i];
 134                         if ((ls->availability<=0)&&
 135                                 (av<ls->availability)&&
 136                                 (prio<ls->priority)&&
 137                                 (ls->selectedlang!=-1)){
 138                                 nBest=ls->selectedlang;
 139                                 av=ls->availability;
 140                                 prio=ls->priority;
 141                         }
 142                 }
 143         if (nBest==-1) /** fall back to C */
 144                 nBest=0;
 145         WC->selected_language=nBest;
 146         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 147         if (search != NULL) {
 148                 free(search);
 149         }
 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                 if (i == 0) {
 256                         sprintf(buf, "%s", AvailLang[i]);       // locale 0 (C) is ascii, not utf-8
 257                 }
 258                 else {
 259                         sprintf(buf, "%s.UTF8", AvailLang[i]);
 260                 }
 261                 wc_locales[i] = newlocale(
 262                         (LC_MESSAGES_MASK|LC_TIME_MASK),
 263                         buf,
 264                         (((i > 0) && (wc_locales[0] != NULL)) ? wc_locales[0] : Empty_Locale)
 265                 );
 266                 if (wc_locales[i] == NULL) {
 267                         lprintf(1, "Error configuring locale for %s: %s\n",
 268                                 buf,
 269                                 strerror(errno)
 270                         );
 271                 }
 272                 else {
 273                         lprintf(3, "Configured available locale: %s\n", buf);
 274                 }
 275         }
 276 }
 277
 278
 279 #else   /* ENABLE_NLS */
 280 /** \brief dummy for non NLS enabled systems */
 281 void offer_languages(void) {
 282         wprintf("English (US)");
 283 }
 284
 285 /** \brief dummy for non NLS enabled systems */
 286 void set_selected_language(char *lang) {
 287 }
 288
 289 /** \brief dummy for non NLS enabled systems */
 290 void go_selected_language(void) {
 291 }
 292
 293 /** \brief dummy for non NLS enabled systems */
 294 void stop_selected_language(void) {
 295 }
 296
 297 #endif  /* ENABLE_NLS */
 298
 299
 300 /*@}*/