newlib/libc/ctype/isspace.c

   1 /*
   2 FUNCTION
   3         <<isspace>>, <<isspace_l>>---whitespace character predicate
   4
   5 INDEX
   6         isspace
   7
   8 INDEX
   9         isspace_l
  10
  11 SYNOPSIS
  12         #include <ctype.h>
  13         int isspace(int <[c]>);
  14
  15         #include <ctype.h>
  16         int isspace_l(int <[c]>, locale_t <[locale]>);
  17
  18 DESCRIPTION
  19 <<isspace>> is a macro which classifies singlebyte charset values by table
  20 lookup.  It is a predicate returning non-zero for whitespace
  21 characters, and 0 for other characters.  It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
  22
  23 <<isspace_l>> is like <<isspace>> but performs the check based on the
  24 locale specified by the locale object locale.  If <[locale]> is
  25 LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
  26
  27 You can use a compiled subroutine instead of the macro definition by
  28 undefining the macro using `<<#undef isspace>>' or `<<#undef isspace_l>>'.
  29
  30 RETURNS
  31 <<isspace>>, <<isspace_l>> return non-zero if <[c]> is a space, tab,
  32 carriage return, new line, vertical tab, or formfeed (<<0x09>>--<<0x0D>>,
  33 <<0x20>>), or one of the other space characters in non-ASCII charsets.
  34
  35 PORTABILITY
  36 <<isspace>> is ANSI C.
  37 <<isspace_l>> is POSIX-1.2008.
  38
  39 No supporting OS subroutines are required.
  40 */
  41 #include <_ansi.h>
  42 #include <ctype.h>
  43
  44
  45 #undef isspace
  46 int
  47 isspace (int c)
  48 {
  49         return(__CTYPE_PTR[c+1] & _S);
  50 }