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isprint, isgraph
[printable character predicates]

SYNOPSIS
#include <ctype.h>
int isprint(int c);
int isgraph(int c);

DESCRIPTION
isprint is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for printable characters, and 0 for other character arguments. It is defined only when isascii(c) is true or c is EOF.

You can use a compiled subroutine instead of the macro definition by undefining either macro, using #undef isprint or #undef isgraph.

RETURNS
isprint returns non-zero if c is a printing character, (0x20–0x7E). isgraph behaves identically to isprint, except that the space character (0x20) is excluded.

COMPLIANCE
isprint and isgraph are ANSI C.

No supporting OS subroutines are required.