chsvlib
chsv helper source code

◆ ucp_iscntrl()

int Chusov::String::ucp_iscntrl ( ucp_t  ch)
noexcept

Returns a flag that indicates whether a given character is a control code in the Unicode code space.

Parameters
chis the character to check.
Returns
A nonzero value, if ch is an ASCII control character, as defined for ucp_iscntrl_ascii, or, if ch is not an ASCII character and belongs to the "Other, Control" general category. Otherwise, the function returns 0.

The function firstly checks if ch belongs to the ASCII code space. If it does, the function returns the result of a call to ucp_iscntrl_ascii. Otherwise, if ch is not an ASCII character the function checks if ch belongs to any of the respective Unicode general category.

The function does not take Unicode surrogate pairs into account and simply returns 0, if ch appertains the range \(\left[\textrm{0xd800}; \textrm{0xf8ff}\right]\). The function also returns 0, if ch does not belong to the range of valid Unicode code points.