3.9 ispunct, ispunct_l—punctuation character predicate

Synopsis

#include <ctype.h>
int ispunct(int c);

#include <ctype.h>
int ispunct_l(int c, locale_t locale);

Description
ispunct is a macro which classifies singlebyte charset values by table lookup. It is a predicate returning non-zero for printable punctuation characters, and 0 for other characters. It is defined only if c is representable as an unsigned char or if c is EOF.

ispunct_l is like ispunct 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 ispunct’ or ‘#undef ispunct_l’.

Returns
ispunct, ispunct_l return non-zero if c is a printable punctuation character.

Portability
ispunct is ANSI C. ispunct_l is POSIX-1.2008.

No supporting OS subroutines are required.