+int icu_utf16_casemap(struct icu_buf_utf16 * dest16,
+ struct icu_buf_utf16 * src16,
+ const char *locale, char action,
+ UErrorCode *status)
+{
+ int32_t dest16_len = 0;
+
+ switch(action) {
+ case 'l':
+ dest16_len = u_strToLower(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ locale, status);
+ break;
+ case 'u':
+ dest16_len = u_strToUpper(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ locale, status);
+ break;
+ case 't':
+ dest16_len = u_strToTitle(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ 0, locale, status);
+ break;
+ case 'f':
+ dest16_len = u_strFoldCase(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ U_FOLD_CASE_DEFAULT, status);
+ break;
+
+ default:
+ return U_UNSUPPORTED_ERROR;
+ break;
+ }
+
+ // check for buffer overflow, resize and retry
+ if (*status == U_BUFFER_OVERFLOW_ERROR
+ && dest16 != src16 // do not resize if in-place conversion
+ //|| dest16_len > dest16->utf16_cap
+ ){
+ icu_buf_utf16_resize(dest16, dest16_len * 2);
+ *status = U_ZERO_ERROR;
+
+
+ switch(action) {
+ case 'l':
+ dest16_len = u_strToLower(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ locale, status);
+ break;
+ case 'u':
+ dest16_len = u_strToUpper(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ locale, status);
+ break;
+ case 't':
+ dest16_len = u_strToTitle(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ 0, locale, status);
+ break;
+ case 'f':
+ dest16_len = u_strFoldCase(dest16->utf16, dest16->utf16_cap,
+ src16->utf16, src16->utf16_len,
+ U_FOLD_CASE_DEFAULT, status);
+ break;
+
+ default:
+ return U_UNSUPPORTED_ERROR;
+ break;
+ }
+ }
+
+ if (U_SUCCESS(*status)
+ && dest16_len < dest16->utf16_cap)
+ dest16->utf16_len = dest16_len;
+ else {
+ dest16->utf16[0] = (UChar) 0;
+ dest16->utf16_len = 0;
+ }
+
+ return *status;
+};
+
+