newlib/libc/ctype/isascii.c

   1 /*
   2 FUNCTION
   3         <<isascii>>, <<isascii_l>>---ASCII character predicate
   4
   5 INDEX
   6         isascii
   7
   8 INDEX
   9         isascii_l
  10
  11 SYNOPSIS
  12         #include <ctype.h>
  13         int isascii(int <[c]>);
  14
  15         #include <ctype.h>
  16         int isascii_l(int <[c]>, locale_t <[locale]>);
  17
  18 DESCRIPTION
  19 <<isascii>> is a macro which returns non-zero when <[c]> is an ASCII
  20 character, and 0 otherwise.  It is defined for all integer values.
  21
  22 <<isascii_l>> is like <<isascii>> but performs the check based on the
  23 locale specified by the locale object locale.  If <[locale]> is
  24 LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
  25
  26 You can use a compiled subroutine instead of the macro definition by
  27 undefining the macro using `<<#undef isascii>>' or `<<#undef isascii_l>>'.
  28
  29 RETURNS
  30 <<isascii>>, <<isascii_l>> return non-zero if the low order byte of <[c]>
  31 is in the range 0 to 127 (<<0x00>>--<<0x7F>>).
  32
  33 PORTABILITY
  34 <<isascii>> is ANSI C.
  35 <<isascii_l>> is a GNU extension.
  36
  37 No supporting OS subroutines are required.
  38 */
  39 #include <_ansi.h>
  40 #include <ctype.h>
  41
  42
  43
  44 #undef isascii
  45
  46 int
  47 isascii (int c)
  48 {
  49         return c >= 0 && c< 128;
  50 }