| |
| /* |
| FUNCTION |
| <<isblank>>---blank character predicate |
| |
| INDEX |
| isblank |
| |
| ANSI_SYNOPSIS |
| #include <ctype.h> |
| int isblank(int <[c]>); |
| |
| TRAD_SYNOPSIS |
| #include <ctype.h> |
| int isblank(<[c]>); |
| |
| DESCRIPTION |
| <<isblank>> is a function which classifies ASCII integer values by table |
| lookup. It is a predicate returning non-zero for blank characters, and 0 |
| for other characters. It is defined only if <[c]> is representable as an |
| unsigned char or if <[c]> is EOF. |
| |
| RETURNS |
| <<isblank>> returns non-zero if <[c]> is a blank character. |
| |
| PORTABILITY |
| <<isblank>> is C99. |
| |
| No supporting OS subroutines are required. |
| */ |
| |
| #include <_ansi.h> |
| #include <ctype.h> |
| |
| |
| |
| #undef isblank |
| int |
| _DEFUN(isblank,(c),int c) |
| { |
| return ((__ctype_ptr__[c+1] & _B) || (c == '\t')); |
| } |
