ispunct---punctuation character predicate
#include <ctype.h> int ispunct(int c);
ispunct is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for printable
punctuation characters, and 0 for other characters. It is defined
isascii(c) is true or c is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `
ispunct returns non-zero if c is a printable punctuation character
isgraph(c) && !isalnum(c)).
ispunct is ANSI C.
No supporting OS subroutines are required.
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