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 9 /**< 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         "fr_FR",
  27         "nl_NL"
  28 };
  29
  30 #ifdef HAVE_USELOCALE
  31 locale_t wc_locales[NUM_LANGS]; /**< here we keep the parsed stuff */
  32 #endif
  33
  34 /** Keep information about one locale */
  35 typedef struct _lang_pref{
  36         char lang[16];          /**< the language locale string */
  37         char region[16];        /**< the region locale string */
  38         long priority;          /**< which priority does it have */
  39         int availability;       /**< do we know it? */
  40         int selectedlang;       /**< is this the selected language? */
  41 } LangStruct;
  42
  43 /* \brief parse browser locale header
  44  * seems as most browsers just do a one after coma value even if more than 10 locales are available. Sample strings:
  45  * opera:
  46  * 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
  47  * Firefox
  48  * Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3'
  49  * Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3
  50  * 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
  51  * \param LocaleString the string from the browser http headers
  52  */
  53
  54 void httplang_to_locale(char *LocaleString)
  55 {
  56         LangStruct wanted_locales[SEARCH_LANG];
  57         LangStruct *ls;
  58
  59         int i = 0;
  60         int j = 0;
  61         /* size_t len = strlen(LocaleString); */
  62         long prio;
  63         int av;
  64         int nBest;
  65         int nParts;
  66         char search[1024];
  67
  68         safestrncpy(search, LocaleString, sizeof search);
  69         nParts=num_tokens(search,',');
  70         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++)
  71         {
  72                         char buf[16];
  73                         char sbuf[16];
  74                         char lbuf[16];
  75                         int blen;
  76
  77                         ls=&wanted_locales[i];
  78
  79                         extract_token(&buf[0],search, i,',',16);
  80                         /** we are searching, if this list item has something like ;q=n*/
  81                         if (num_tokens(&buf[0],'=')>1) {
  82                                 int sbuflen, k;
  83                                 extract_token(&sbuf[0],&buf[0], 1,'=',16);
  84                                 sbuflen=strlen(&sbuf[0]);
  85                                 for (k=0; k<sbuflen; k++) if (sbuf[k]=='.') sbuf[k]='0';
  86                                 ls->priority=atol(&sbuf[0]);
  87                         }
  88                         else {
  89                                 ls->priority=1000;
  90                         }
  91                         /** get the locale part */
  92                         extract_token(&sbuf[0],&buf[0],0,';',16);
  93                         /** get the lang part, which should be allways there */
  94                         extract_token(&ls->lang[0],&sbuf[0],0,'-',16);
  95                         /** get the area code if any. */
  96                         if (num_tokens(&sbuf[0],'-')>1) {
  97                                 extract_token(&ls->region[0],&sbuf[0],1,'-',16);
  98                         }
  99                         else { /** no ara code? use lang code */
 100                                 blen=strlen(&ls->lang[0]);
 101                                 memcpy(&ls->region[0], ls->lang,blen);
 102                                 ls->region[blen]='\0';
 103                         } /** area codes are uppercase */
 104                         blen=strlen(&ls->region[0]);
 105                         for (j=0; j<blen; j++)
 106                                 {
 107                                         int chars=toupper(ls->region[j]);
 108                                         ls->region[j]=(char)chars;/** \todo ?! */
 109                                 }
 110                         sprintf(&lbuf[0],"%s_%s",&ls->lang[0],&ls->region[0]);
 111
 112                         /** check if we have this lang */
 113                         ls->availability=1;
 114                         ls->selectedlang=-1;
 115                         for (j=0; j<NUM_LANGS; j++) {
 116                                 int result;
 117                                 /** match against the LANG part */
 118                                 result=strcasecmp(&ls->lang[0], AvailLang[j]);
 119                                 if ((result<0)&&(result<ls->availability)){
 120                                         ls->availability=result;
 121                                         ls->selectedlang=j;
 122                                 }
 123                                 /** match against lang and locale */
 124                                 if (0==strcasecmp(&lbuf[0], AvailLang[j])){
 125                                         ls->availability=0;
 126                                         ls->selectedlang=j;
 127                                         j=NUM_LANGS;
 128                                 }
 129                         }
 130         }
 131
 132         prio=0;
 133         av=-1000;
 134         nBest=-1;
 135         for (i=0; ((i<nParts)&&(i<SEARCH_LANG)); i++) {
 136                 ls=&wanted_locales[i];
 137                 if ((ls->availability<=0)&&
 138                    (av<ls->availability)&&
 139                    (prio<ls->priority)&&
 140                    (ls->selectedlang!=-1)) {
 141                         nBest=ls->selectedlang;
 142                         av=ls->availability;
 143                         prio=ls->priority;
 144                 }
 145         }
 146         if (nBest == -1) {
 147                 /** fall back to C */
 148                 nBest=0;
 149         }
 150         WC->selected_language=nBest;
 151         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 152 }
 153
 154 /* TODO: we skip the language weighting so far. */
 155 /* Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3' */
 156 /* Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3 */
 157 //void httplang_to_locale(char *LocaleString)
 158 //{
 159 //      char selected_locale[16];
 160 //      int i, j;
 161 //      char lang[64];
 162 //      int num_accept = 0;
 163 //
 164 //      lprintf(9, "languageAccept: %s\n", LocaleString);
 165 //
 166 //      strcpy(selected_locale, "C");
 167 //      num_accept = num_tokens(LocaleString, ',');
 168 //
 169 //      for (i=num_accept-1; i>=0; --i) {
 170 //              extract_token(lang, LocaleString, i, ',', sizeof lang);
 171 //
 172 //              /* Strip out the weights; we don't use them.  Also convert
 173 //               * hyphens to underscores.
 174 //               */
 175 //              for (j=0; j<strlen(lang); ++j) {
 176 //                      if (lang[j] == '-') lang[j] = '_';
 177 //                      if (lang[j] == ';') lang[j] = 0;
 178 //              }
 179 //
 180 //              for (j=0; j<NUM_LANGS; ++j) {
 181 //                      if (!strncasecmp(lang, AvailLang[j], strlen(lang))) {
 182 //                              strcpy(selected_locale, AvailLang[j]);
 183 //                      }
 184 //              }
 185 //      }
 186 //
 187 //      lprintf(9, "language found: %s\n", selected_locale);
 188 //      set_selected_language(selected_locale);
 189 //}
 190
 191
 192 /**
 193  * \brief show the language chooser on the login dialog
 194  * depending on the browser locale change the sequence of the
 195  * language chooser.
 196  */
 197 void offer_languages(void) {
 198         int i;
 199
 200         wprintf("<select name=\"language\" id=\"lname\" size=\"1\">\n");
 201
 202         for (i=0; i < NUM_LANGS; ++i) {
 203                 wprintf("<option %s value=%s>%s</option>\n",
 204                         ((WC->selected_language == i) ? "selected" : ""),
 205                         AvailLang[i],
 206                         AvailLang[i]
 207                 );
 208         }
 209
 210         wprintf("</select>\n");
 211 }
 212
 213 /**
 214  * \brief Set the selected language for this session.
 215  * \param lang the locale to set.
 216  */
 217 void set_selected_language(char *lang) {
 218         int i;
 219
 220         for (i=0; i<NUM_LANGS; ++i) {
 221                 if (!strcasecmp(lang, AvailLang[i])) {
 222                         WC->selected_language = i;
 223                 }
 224         }
 225 }
 226
 227 /**
 228  * \brief Activate the selected language for this session.
 229  */
 230 void go_selected_language(void) {
 231 #ifdef HAVE_USELOCALE
 232         if (WC->selected_language < 0) return;
 233         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 234         textdomain(textdomain(NULL));                   /** clear the cache */
 235 #endif
 236 }
 237
 238 /**
 239  * \brief Deactivate the selected language for this session.
 240  */
 241 void stop_selected_language(void) {
 242 #ifdef HAVE_USELOCALE
 243         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 244         textdomain(textdomain(NULL));                   /** clear the cache */
 245 #endif
 246 }
 247
 248 void preset_locale(void)
 249 {
 250 #ifndef HAVE_USELOCALE
 251 #ifdef HAVE_GETTEXT
 252         char *language;
 253
 254         language = getenv("LANG");
 255         setlocale(LC_MESSAGES, language);
 256 #endif
 257 #endif
 258 }
 259 /**
 260  * \brief Create a locale_t for each available language
 261  */
 262 void initialize_locales(void) {
 263         int i;
 264         char buf[32];
 265
 266 #ifdef HAVE_USELOCALE
 267         locale_t Empty_Locale;
 268
 269         /* create default locale */
 270         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 271 #endif
 272
 273         for (i = 0; i < NUM_LANGS; ++i) {
 274                 if (i == 0) {
 275                         sprintf(buf, "%s", AvailLang[i]);       // locale 0 (C) is ascii, not utf-8
 276                 }
 277                 else {
 278                         sprintf(buf, "%s.UTF8", AvailLang[i]);
 279                 }
 280 #ifdef HAVE_USELOCALE
 281                 wc_locales[i] = newlocale(
 282                         (LC_MESSAGES_MASK|LC_TIME_MASK),
 283                         buf,
 284                         (((i > 0) && (wc_locales[0] != NULL)) ? wc_locales[0] : Empty_Locale)
 285                 );
 286                 if (wc_locales[i] == NULL) {
 287                         lprintf(1, "Error configuring locale for %s: %s\n",
 288                                 buf,
 289                                 strerror(errno)
 290                         );
 291                 }
 292                 else {
 293                         lprintf(3, "Configured available locale: %s\n", buf);
 294                 }
 295 #endif
 296         }
 297 }
 298
 299
 300 #else   /* ENABLE_NLS */
 301 /** \brief dummy for non NLS enabled systems */
 302 void offer_languages(void) {
 303         wprintf("English (US)");
 304 }
 305
 306 /** \brief dummy for non NLS enabled systems */
 307 void set_selected_language(char *lang) {
 308 }
 309
 310 /** \brief dummy for non NLS enabled systems */
 311 void go_selected_language(void) {
 312 }
 313
 314 /** \brief dummy for non NLS enabled systems */
 315 void stop_selected_language(void) {
 316 }
 317
 318 void preset_locale(void)
 319 {
 320 }
 321 #endif  /* ENABLE_NLS */
 322
 323
 324 /*@}*/