1 files changed, 46 insertions, 0 deletions
diff --git a/libc/ctype/ispunct.c b/libc/ctype/ispunct.c
new file mode 100644
index 0000000..c567932
--- /dev/null
+++ b/libc/ctype/ispunct.c
@@ -0,0 +1,46 @@
+
+/*
+FUNCTION
+<<ispunct>>---punctuation character predicate
+
+INDEX
+ispunct
+
+ANSI_SYNOPSIS
+#include <ctype.h>
+int ispunct(int <[c]>);
+
+TRAD_SYNOPSIS
+#include <ctype.h>
+int ispunct(<[c]>);
+
+DESCRIPTION
+<<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
+only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
+
+You can use a compiled subroutine instead of the macro definition by
+undefining the macro using `<<#undef ispunct>>'.
+
+RETURNS
+<<ispunct>> returns non-zero if <[c]> is a printable punctuation character 
+(<<isgraph(<[c]>) && !isalnum(<[c]>)>>).
+
+PORTABILITY
+<<ispunct>> is ANSI C.
+
+No supporting OS subroutines are required.
+*/
+
+#include <_ansi.h>
+#include <ctype.h>
+
+
+#undef ispunct
+int
+_DEFUN(ispunct,(c),int c)
+{
+	return((_ctype_ + 1)[c] & _P);
+}
+