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 7 /**< 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 };
  27
  28 locale_t wc_locales[NUM_LANGS]; /**< here we keep the parsed stuff */
  29
  30 /** Keep information about one locale */
  31 typedef struct _lang_pref{
  32         char lang[16];          /**< the language locale string */
  33         char region[16];        /**< the region locale string */
  34         long priority;          /**< which priority does it have */
  35         int availability;       /**< do we know it? */
  36         int selectedlang;       /**< is this the selected language? */
  37 } LangStruct;
  38
  39 /* \brief parse browser locale header
  40  * seems as most browsers just do a one after coma value even if more than 10 locales are available. Sample strings:
  41  * opera:
  42  * 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
  43  * Firefox
  44  * Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3'
  45  * Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3
  46  * 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
  47  * \param LocaleString the string from the browser http headers
  48  */
  49
  50 void httplang_to_locale(char *LocaleString)
  51 {
  52         LangStruct wanted_locales[SEARCH_LANG];
  53         LangStruct *ls;
  54
  55         int i = 0;
  56         int j = 0;
  57         size_t len = strlen(LocaleString);
  58         long prio;
  59         int av;
  60         int nBest;
  61         int nParts;
  62         char *search = (char *) malloc(len);
  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         if (search != NULL) {
 149                 free(search);
 150         }
 151 }
 152
 153 /* TODO: we skip the language weightening so far. */
 154 /* Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3' */
 155 /* Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3 */
 156 //void httplang_to_locale(char *LocaleString)
 157 //{
 158 //      char selected_locale[16];
 159 //      int i, j;
 160 //      char lang[64];
 161 //      int num_accept = 0;
 162 //
 163 //      lprintf(9, "languageAccept: %s\n", LocaleString);
 164 //
 165 //      strcpy(selected_locale, "C");
 166 //      num_accept = num_tokens(LocaleString, ',');
 167 //
 168 //      for (i=num_accept-1; i>=0; --i) {
 169 //              extract_token(lang, LocaleString, i, ',', sizeof lang);
 170 //
 171 //              /* Strip out the weights; we don't use them.  Also convert
 172 //               * hyphens to underscores.
 173 //               */
 174 //              for (j=0; j<strlen(lang); ++j) {
 175 //                      if (lang[j] == '-') lang[j] = '_';
 176 //                      if (lang[j] == ';') lang[j] = 0;
 177 //              }
 178 //
 179 //              for (j=0; j<NUM_LANGS; ++j) {
 180 //                      if (!strncasecmp(lang, AvailLang[j], strlen(lang))) {
 181 //                              strcpy(selected_locale, AvailLang[j]);
 182 //                      }
 183 //              }
 184 //      }
 185 //
 186 //      lprintf(9, "language found: %s\n", selected_locale);
 187 //      set_selected_language(selected_locale);
 188 //}
 189
 190
 191 /**
 192  * \brief show the language chooser on the login dialog
 193  * depending on the browser locale change the sequence of the
 194  * language chooser.
 195  */
 196 void offer_languages(void) {
 197         int i;
 198
 199         wprintf("<select name=\"language\" size=\"1\">\n");
 200
 201         for (i=0; i < NUM_LANGS; ++i) {
 202                 wprintf("<option %s value=%s>%s</option>\n",
 203                         ((WC->selected_language == i) ? "selected" : ""),
 204                         AvailLang[i],
 205                         AvailLang[i]
 206                 );
 207         }
 208
 209         wprintf("</select>\n");
 210 }
 211
 212 /**
 213  * \brief Set the selected language for this session.
 214  * \param lang the locale to set.
 215  */
 216 void set_selected_language(char *lang) {
 217         int i;
 218
 219         for (i=0; i<NUM_LANGS; ++i) {
 220                 if (!strcasecmp(lang, AvailLang[i])) {
 221                         WC->selected_language = i;
 222                 }
 223         }
 224 }
 225
 226 /**
 227  * \brief Activate the selected language for this session.
 228  */
 229 void go_selected_language(void) {
 230         if (WC->selected_language < 0) return;
 231         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 232         textdomain(textdomain(NULL));                   /** clear the cache */
 233 }
 234
 235 /**
 236  * \brief Deactivate the selected language for this session.
 237  */
 238 void stop_selected_language(void) {
 239         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 240         textdomain(textdomain(NULL));                   /** clear the cache */
 241 }
 242
 243
 244 /**
 245  * \brief Create a locale_t for each available language
 246  */
 247 void initialize_locales(void) {
 248         int i;
 249         locale_t Empty_Locale;
 250         char buf[32];
 251
 252         /* create default locale */
 253         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 254
 255         for (i = 0; i < NUM_LANGS; ++i) {
 256                 if (i == 0) {
 257                         sprintf(buf, "%s", AvailLang[i]);       // locale 0 (C) is ascii, not utf-8
 258                 }
 259                 else {
 260                         sprintf(buf, "%s.UTF8", AvailLang[i]);
 261                 }
 262                 wc_locales[i] = newlocale(
 263                         (LC_MESSAGES_MASK|LC_TIME_MASK),
 264                         buf,
 265                         (((i > 0) && (wc_locales[0] != NULL)) ? wc_locales[0] : Empty_Locale)
 266                 );
 267                 if (wc_locales[i] == NULL) {
 268                         lprintf(1, "Error configuring locale for %s: %s\n",
 269                                 buf,
 270                                 strerror(errno)
 271                         );
 272                 }
 273                 else {
 274                         lprintf(3, "Configured available locale: %s\n", buf);
 275                 }
 276         }
 277 }
 278
 279
 280 #else   /* ENABLE_NLS */
 281 /** \brief dummy for non NLS enabled systems */
 282 void offer_languages(void) {
 283         wprintf("English (US)");
 284 }
 285
 286 /** \brief dummy for non NLS enabled systems */
 287 void set_selected_language(char *lang) {
 288 }
 289
 290 /** \brief dummy for non NLS enabled systems */
 291 void go_selected_language(void) {
 292 }
 293
 294 /** \brief dummy for non NLS enabled systems */
 295 void stop_selected_language(void) {
 296 }
 297
 298 #endif  /* ENABLE_NLS */
 299
 300
 301 /*@}*/