isextupper Function (Macro)

ctype.h

short isextupper (short c);

Checks whether a character is an uppercase, including foreign ones.

isextupper returns nonzero if c is an uppercase letter, either ordinary ('A' to 'Z') or foreign one (see isfrgnupper), otherwise it returns zero. It is an inline function which is implemented using GNU C smart macros, which expands to a medium-sized code.