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