/* {{{ grapheme_get_haystack_offset - bump the haystack pointer based on the grapheme count offset */
UChar *
grapheme_get_haystack_offset(UBreakIterator* bi, UChar *uhaystack, int32_t uhaystack_len, int32_t offset)
{
UErrorCode status;
int32_t pos;
int32_t (*iter_op)(UBreakIterator* bi);
int iter_incr;
if ( NULL != bi ) {
status = U_ZERO_ERROR;
ubrk_setText (bi, uhaystack, uhaystack_len, &status);
}
if ( 0 == offset ) {
return uhaystack;
}
if ( offset < 0 ) {
iter_op = ubrk_previous;
ubrk_last(bi); /* one past the end */
iter_incr = 1;
}
else {
iter_op = ubrk_next;
iter_incr = -1;
}
pos = 0;
while ( pos != UBRK_DONE && offset != 0 ) {
pos = iter_op(bi);
if ( UBRK_DONE != pos ) {
offset += iter_incr;
}
}
if ( offset != 0 ) {
return NULL;
}
return uhaystack + pos;
}
/* {{{ grapheme_get_haystack_offset - bump the haystack pointer based on the grapheme count offset */
int32_t grapheme_get_haystack_offset(UBreakIterator* bi, int32_t offset)
{
int32_t pos;
int32_t (*iter_op)(UBreakIterator* bi);
int iter_incr;
if ( 0 == offset ) {
return 0;
}
if ( offset < 0 ) {
iter_op = ubrk_previous;
ubrk_last(bi); /* one past the end */
iter_incr = 1;
}
else {
iter_op = ubrk_next;
iter_incr = -1;
}
pos = 0;
while ( pos != UBRK_DONE && offset != 0 ) {
pos = iter_op(bi);
if ( UBRK_DONE != pos ) {
offset += iter_incr;
}
}
if ( offset != 0 ) {
return -1;
}
return pos;
}
