Synopsis
#include <ctype.h> int isspace(int c);
Description
isspace returns nonzero (true) if and only if the value of the argument
c is a standard white-space character. The standard white-space characters
are space (' '), form feed ('\f'), new-line ('\n'),
carriage return ('\r'), horizontal tab ('\t'), and
vertical tab ('\v').
Portability
isspace conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).