isspace, isspace_l—whitespace character predicateSynopsis
#include <ctype.h> int isspace(int c); #include <ctype.h> int isspace_l(int c, locale_t locale);
Description
isspace is a macro which classifies singlebyte charset values by table
lookup. It is a predicate returning non-zero for whitespace
characters, and 0 for other characters. It is defined only when isascii(c) is true or c is EOF.
isspace_l is like isspace but performs the check based on the
locale specified by the locale object locale. If locale is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using ‘#undef isspace’ or ‘#undef isspace_l’.
Returns
isspace, isspace_l return non-zero if c is a space, tab,
carriage return, new line, vertical tab, or formfeed (0x09–0x0D,
0x20), or one of the other space characters in non-ASCII charsets.
Portability
isspace is ANSI C.
isspace_l is POSIX-1.2008.
No supporting OS subroutines are required.