man3/iswblank.3

   1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
   2 .\"
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   8 .\" References consulted:
   9 .\"   GNU glibc-2 source code and manual
  10 .\"   Dinkumware C library reference http://www.dinkumware.com/
  11 .\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
  12 .\"   ISO/IEC 9899:1999
  13 .\"
  14 .TH ISWBLANK 3  1999-07-25 "GNU" "Linux Programmer's Manual"
  15 .SH NAME
  16 iswblank \- test for whitespace wide character
  17 .SH SYNOPSIS
  18 .nf
  19 .B #include <wctype.h>
  20 .sp
  21 .BI "int iswblank(wint_t " wc );
  22 .fi
  23 .SH DESCRIPTION
  24 The \fBiswblank\fP() function is the wide-character equivalent of the
  25 \fBisblank\fP function. It tests whether \fIwc\fP is a wide character
  26 belonging to the wide character class "blank".
  27 .PP
  28 The wide character class "blank" is a subclass of the wide character class
  29 "space".
  30 .PP
  31 Being a subclass of the wide character class "space", the wide character class
  32 "blank" is disjoint from the wide character class "graph" and therefore also
  33 disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit",
  34 "xdigit", "punct".
  35 .PP
  36 The wide character class "blank" always contains at least the space character
  37 and the control character '\\t'.
  38 .SH "RETURN VALUE"
  39 The \fBiswblank\fP() function returns non-zero if \fIwc\fP is a wide character
  40 belonging to the wide character class "blank". Otherwise it returns zero.
  41 .SH "CONFORMING TO"
  42 This function is a GNU extension.
  43 .SH "SEE ALSO"
  44 .BR isblank (3),
  45 .BR iswctype (3)
  46 .SH NOTES
  47 The behaviour of \fBiswblank\fP() depends on the LC_CTYPE category of the
  48 current locale.