| isfrgnalnum | Function (Macro)

ctype.h

short isfrgnalnum (short c);

Checks whether a character is a foreign letter which is valid in a variable name.

isfrgnalnum is the same as isfrgn, except small Greek "pi" is excluded, because it is the reserved symbol and it is not valid in a variable name. isfrgnalnum is an inline function which is implemented using GNU C smart macros, which expands to a relatively large code.