NAME
iswblank
iswblank_l — test for a
blank wide-character code
SYNOPSIS
#include
<wctype.h>
int iswblank(wint_t wc); [CX] int iswblank_l(wint_t wc, locale_t locale);
DESCRIPTION
For iswblank (): [CX]
The functionality described on this reference page is aligned with the ISO C
standard. Any conflict between the requirements described here and the ISO C
standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C
standard.
The iswblank ()
[CX] and iswblank () functions
shall test whether wc is a wide-character code
representing a character of class
blank in the
current locale, [CX] or in the locale represented by
locale, respectively; see XBD
V1_chap07(7).
The wc argument is a wint_t, the value of which the application shall ensure is a wide-character code corresponding to a valid character in the locale used by the function, or equal to the value of the macro WEOF. If the argument has any other value, the behavior is undefined.
[CX] The behavior is undefined if the locale argument to iswblank_l () is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.
RETURN VALUE
The iswblank () [CX] and
iswblank_l () functions shall return non-zero if
wc is a blank wide-character code; otherwise, they shall
return 0.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
To ensure applications portability, especially across natural languages, only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalnum(3), iswalpha(3), iswcntrl(3), iswctype(3), iswdigit(3), iswgraph(3), iswlower(3), iswprint(3), iswpunct(3), iswspace(3), iswupper(3), iswxdigit(3), setlocale(3), uselocale(3)
XBD V1_chap07(7), <locale.h>, <wctype.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.
Issue 7
The iswblank_l () function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0315 [302], XSH/TC1-2008/0316 [283], and XSH/TC1-2008/0317 [283] are applied.
POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0182 [685] is applied.