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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "i18n.h"
/*
* Accept-Language = "Accept-Language" ":"
* 1#( language-range [ ";" "q" "=" qvalue ] )
* language-range = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
*
* NLS_AccLangList() assumes that "Accept-Language:" has already
* been stripped off. It takes as input
*
* 1#( ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" ) [ ";" "q" "=" qvalue ] )
*
* and returns a list of languages, ordered by qvalues, in
* the array NLS_ACCEPT_LANGUAGE_LIST.
*
* If there are to many languages (>NLS_MAX_ACCEPT_LANGUAGE) the excess
* is ignored. If the language-range is too long (>NLS_MAX_ACCEPT_LENGTH),
* the language-range is ignored. In these cases, NLS_AccLangList()
* will quietly return, perhaps with numLang = 0. numLang is
* returned by the function.
*/
static size_t
AcceptLangList(const char* AcceptLanguage,
ACCEPT_LANGUAGE_LIST AcceptLanguageList)
{
char* input;
char* cPtr;
char* cPtr1;
char* cPtr2;
int i;
int j;
int countLang = 0;
input = strdup(AcceptLanguage);
if (input == (char*)NULL){
return 0;
}
cPtr1 = input-1;
cPtr2 = input;
/* put in standard form */
while (*(++cPtr1)) {
if (isalpha(*cPtr1)) *cPtr2++ = tolower(*cPtr1); /* force lower case */
else if (isspace(*cPtr1)); /* ignore any space */
else if (*cPtr1=='-') *cPtr2++ = '_'; /* "-" -> "_" */
else if (*cPtr1=='*'); /* ignore "*" */
else *cPtr2++ = *cPtr1; /* else unchanged */
}
*cPtr2 = '\0';
countLang = 0;
if (strchr(input,';')) {
/* deal with the quality values */
float qvalue[MAX_ACCEPT_LANGUAGE];
float qSwap;
float bias = 0.0f;
char* ptrLanguage[MAX_ACCEPT_LANGUAGE];
char* ptrSwap;
cPtr = strtok(input,",");
while (cPtr) {
qvalue[countLang] = 1.0f;
if ((cPtr1 = strchr(cPtr,';'))) {
sscanf(cPtr1,";q=%f",&qvalue[countLang]);
*cPtr1 = '\0';
}
if (strlen(cPtr)<MAX_ACCEPT_LENGTH) { /* ignore if too long */
qvalue[countLang] -= (bias += 0.0001f); /* to insure original order */
ptrLanguage[countLang++] = cPtr;
if (countLang>=MAX_ACCEPT_LANGUAGE) break; /* quit if too many */
}
cPtr = strtok(NULL,",");
}
/* sort according to decending qvalue */
/* not a very good algorithm, but count is not likely large */
for ( i=0 ; i<countLang-1 ; i++ ) {
for ( j=i+1 ; j<countLang ; j++ ) {
if (qvalue[i]<qvalue[j]) {
qSwap = qvalue[i];
qvalue[i] = qvalue[j];
qvalue[j] = qSwap;
ptrSwap = ptrLanguage[i];
ptrLanguage[i] = ptrLanguage[j];
ptrLanguage[j] = ptrSwap;
}
}
}
for ( i=0 ; i<countLang ; i++ ) {
strcpy(AcceptLanguageList[i],ptrLanguage[i]);
}
} else {
/* simple case: no quality values */
cPtr = strtok(input,",");
while (cPtr) {
if (strlen(cPtr)<MAX_ACCEPT_LENGTH) { /* ignore if too long */
strcpy(AcceptLanguageList[countLang++],cPtr);
if (countLang>=MAX_ACCEPT_LANGUAGE) break; /* quit if too many */
}
cPtr = strtok(NULL,",");
}
}
free(input);
return countLang;
}
/*
* Get prioritized locale list from NLS_AcceptLangList
*
* Add additonal language to the list for fallback if locale
* name is language_region
*
*/
int
XP_AccLangList(char* AcceptLanguage,
ACCEPT_LANGUAGE_LIST AcceptLanguageList)
{
int i;
int n;
char *defaultLanguage = "en";
ACCEPT_LANGUAGE_LIST curLanguageList;
int index = 0;
char lang[3];
int k;
n = AcceptLangList(AcceptLanguage, curLanguageList);
if (n == 0)
return 0;
memset(lang, 0, 3);
for (i = 0; i < n; i++) {
if (*lang && (strncmp(lang, curLanguageList[i], 2) != 0)) {
/* add lang if current language is the last occurence in the list */
for (k = i+1; (k < n) && strncmp(curLanguageList[k],lang,2); k++);
if (k == n) {
strcpy(AcceptLanguageList[index++], lang);
*lang = '\0';
}
}
strcpy(AcceptLanguageList[index++], curLanguageList[i]);
/* Add current language for future appending.,make sure it's not on list */
if ((strlen(curLanguageList[i]) > 2) && (curLanguageList[i][2] == '_')) {
strncpy(lang, curLanguageList[i], 2);
for (k = 0; (k < index) && strcmp(AcceptLanguageList[k], lang); k++);
if (k != index) lang[0] = '\0';
}
}
if (lang[0] != '\0')
strcpy(AcceptLanguageList[index++], lang); /* add new lang */
/* Append defaultLanguage if it's not in the list */
for (i = 0; (i < index) && strcmp(AcceptLanguageList[i], defaultLanguage); i++);
if (i == index)
strcpy(AcceptLanguageList[index++], defaultLanguage);
return index;
}
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