a pointer to a position within a UTF-8 encoded string
Optionalend: stringa pointer to the byte following the end of the string, or NULL to indicate that the string is nul-terminated
a pointer to the found character or NULL if end is set and is reached
Finds the start of the next UTF-8 character in the string after
p.pdoes not have to be at the beginning of a UTF-8 character. No check is made to see if the character found is actually valid other than it starts with an appropriate byte.If
endisNULL, the return value will never beNULL: if the end of the string is reached, a pointer to the terminating nul byte is returned. Ifendis non-NULL, the return value will beNULLif the end of the string is reached.