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[1024];
  63
  64         safestrncpy(search, LocaleString, sizeof search);
  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                 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) {
 143                 /** fall back to C */
 144                 nBest=0;
 145         }
 146         WC->selected_language=nBest;
 147         lprintf(9, "language found: %s\n", AvailLang[WC->selected_language]);
 148 }
 149
 150 /* TODO: we skip the language weightening so far. */
 151 /* Accept-Language: 'de-de,en-us;q=0.7,en;q=0.3' */
 152 /* Accept-Language: de,en-ph;q=0.8,en-us;q=0.5,de-at;q=0.3 */
 153 //void httplang_to_locale(char *LocaleString)
 154 //{
 155 //      char selected_locale[16];
 156 //      int i, j;
 157 //      char lang[64];
 158 //      int num_accept = 0;
 159 //
 160 //      lprintf(9, "languageAccept: %s\n", LocaleString);
 161 //
 162 //      strcpy(selected_locale, "C");
 163 //      num_accept = num_tokens(LocaleString, ',');
 164 //
 165 //      for (i=num_accept-1; i>=0; --i) {
 166 //              extract_token(lang, LocaleString, i, ',', sizeof lang);
 167 //
 168 //              /* Strip out the weights; we don't use them.  Also convert
 169 //               * hyphens to underscores.
 170 //               */
 171 //              for (j=0; j<strlen(lang); ++j) {
 172 //                      if (lang[j] == '-') lang[j] = '_';
 173 //                      if (lang[j] == ';') lang[j] = 0;
 174 //              }
 175 //
 176 //              for (j=0; j<NUM_LANGS; ++j) {
 177 //                      if (!strncasecmp(lang, AvailLang[j], strlen(lang))) {
 178 //                              strcpy(selected_locale, AvailLang[j]);
 179 //                      }
 180 //              }
 181 //      }
 182 //
 183 //      lprintf(9, "language found: %s\n", selected_locale);
 184 //      set_selected_language(selected_locale);
 185 //}
 186
 187
 188 /**
 189  * \brief show the language chooser on the login dialog
 190  * depending on the browser locale change the sequence of the
 191  * language chooser.
 192  */
 193 void offer_languages(void) {
 194         int i;
 195
 196         wprintf("<select name=\"language\" size=\"1\">\n");
 197
 198         for (i=0; i < NUM_LANGS; ++i) {
 199                 wprintf("<option %s value=%s>%s</option>\n",
 200                         ((WC->selected_language == i) ? "selected" : ""),
 201                         AvailLang[i],
 202                         AvailLang[i]
 203                 );
 204         }
 205
 206         wprintf("</select>\n");
 207 }
 208
 209 /**
 210  * \brief Set the selected language for this session.
 211  * \param lang the locale to set.
 212  */
 213 void set_selected_language(char *lang) {
 214         int i;
 215
 216         for (i=0; i<NUM_LANGS; ++i) {
 217                 if (!strcasecmp(lang, AvailLang[i])) {
 218                         WC->selected_language = i;
 219                 }
 220         }
 221 }
 222
 223 /**
 224  * \brief Activate the selected language for this session.
 225  */
 226 void go_selected_language(void) {
 227         if (WC->selected_language < 0) return;
 228         uselocale(wc_locales[WC->selected_language]);   /** switch locales */
 229         textdomain(textdomain(NULL));                   /** clear the cache */
 230 }
 231
 232 /**
 233  * \brief Deactivate the selected language for this session.
 234  */
 235 void stop_selected_language(void) {
 236         uselocale(LC_GLOBAL_LOCALE);                    /** switch locales */
 237         textdomain(textdomain(NULL));                   /** clear the cache */
 238 }
 239
 240
 241 /**
 242  * \brief Create a locale_t for each available language
 243  */
 244 void initialize_locales(void) {
 245         int i;
 246         locale_t Empty_Locale;
 247         char buf[32];
 248
 249         /* create default locale */
 250         Empty_Locale = newlocale(LC_ALL_MASK, NULL, NULL);
 251
 252         for (i = 0; i < NUM_LANGS; ++i) {
 253                 if (i == 0) {
 254                         sprintf(buf, "%s", AvailLang[i]);       // locale 0 (C) is ascii, not utf-8
 255                 }
 256                 else {
 257                         sprintf(buf, "%s.UTF8", AvailLang[i]);
 258                 }
 259                 wc_locales[i] = newlocale(
 260                         (LC_MESSAGES_MASK|LC_TIME_MASK),
 261                         buf,
 262                         (((i > 0) && (wc_locales[0] != NULL)) ? wc_locales[0] : Empty_Locale)
 263                 );
 264                 if (wc_locales[i] == NULL) {
 265                         lprintf(1, "Error configuring locale for %s: %s\n",
 266                                 buf,
 267                                 strerror(errno)
 268                         );
 269                 }
 270                 else {
 271                         lprintf(3, "Configured available locale: %s\n", buf);
 272                 }
 273         }
 274 }
 275
 276
 277 #else   /* ENABLE_NLS */
 278 /** \brief dummy for non NLS enabled systems */
 279 void offer_languages(void) {
 280         wprintf("English (US)");
 281 }
 282
 283 /** \brief dummy for non NLS enabled systems */
 284 void set_selected_language(char *lang) {
 285 }
 286
 287 /** \brief dummy for non NLS enabled systems */
 288 void go_selected_language(void) {
 289 }
 290
 291 /** \brief dummy for non NLS enabled systems */
 292 void stop_selected_language(void) {
 293 }
 294
 295 #endif  /* ENABLE_NLS */
 296
 297
 298 /*@}*/