Fixed handling of different decimal separators on DigitList::set().

patches/nan.patch

+Index: source/i18n/digitlst.cpp
+===================================================================
+--- source/i18n/digitlst.cpp    (revision 88316)
++++ source/i18n/digitlst.cpp    (working copy)
+@@ -60,6 +60,18 @@
+ 
+ U_NAMESPACE_BEGIN
+ 
++static void
++loadDecimalChar() {
++    if (gDecimal == 0) {
++        char rep[MAX_DIGITS];
++        // For machines that decide to change the decimal on you,
++        // and try to be too smart with localization.
++        // This normally should be just a '.'.
++        sprintf(rep, "%+1.1f", 1.0);
++        gDecimal = rep[2];
++    }
++}
++
+ // -------------------------------------
+ // default constructor
+ 
+@@ -398,15 +410,6 @@
+     }
+     DigitList *nonConstThis = const_cast<DigitList *>(this);
+ 
+-    if (gDecimal == 0) {
+-        char rep[MAX_DIGITS];
+-        // For machines that decide to change the decimal on you,
+-        // and try to be too smart with localization.
+-        // This normally should be just a '.'.
+-        sprintf(rep, "%+1.1f", 1.0);
+-        gDecimal = rep[2];
+-    }
+-
+     if (isZero()) {
+         nonConstThis->fDouble = 0.0;
+         if (decNumberIsNegative(fDecNumber)) {
+@@ -441,6 +444,7 @@
+         }
+         U_ASSERT(uprv_strlen(&s[0]) < MAX_DBL_DIGITS+18);
+         
++        loadDecimalChar();
+         if (gDecimal != '.') {
+             char *decimalPt = strchr(s, '.');
+             if (decimalPt != NULL) {
+@@ -727,6 +731,17 @@
+     sprintf(rep, "%+1.*e", MAX_DBL_DIGITS - 1, source);
+     U_ASSERT(uprv_strlen(rep) < sizeof(rep));
+ 
++    // uprv_decNumberFromString() will parse the string expecting '.' as a
++    // decimal separator, however sprintf() can use ',' in certain locales.
++    // Overwrite a different decimal separator with '.' here before proceeding.
++    loadDecimalChar();
++    if (gDecimal != '.') {
++        char *decimalPt = strchr(rep, gDecimal);
++        if (decimalPt != NULL) {
++            *decimalPt = '.';
++        }
++    }
++
+     // Create a decNumber from the string.
+     uprv_decNumberFromString(fDecNumber, rep, &fContext);
+     uprv_decNumberTrim(fDecNumber);