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man pages section 3: Basic Library Functions

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Updated: Thursday, June 13, 2019
 
 

iswdigit(3C)

Name

iswalpha, isenglish, isideogram, isnumber, isphonogram, isspecial, iswalnum, iswascii, iswblank, iswcntrl, iswdigit, iswgraph, iswlower, iswprint, iswpunct, iswspace, iswupper, iswxdigit, iswalpha_l, iswalnum_l, iswblank_l, iswcntrl_l, iswdigit_l, iswgraph_l, iswlower_l, iswprint_l, iswpunct_l, iswspace_l, iswupper_l, iswxdigit_l - wide-character code classification functions

Synopsis

#include <wchar.h>
#include <wctype.h>

int iswalpha(wint_t wc);
int isenglish(wint_t wc);
int isideogram(wint_t wc);
int isnumber(wint_t wc);
int isphonogram(wint_t wc);
int isspecial(wint_t wc);
int iswalnum(wint_t wc);
int iswascii(wint_t wc);
int iswblank(wint_t wc);
int iswcntrl(wint_t wc);
int iswdigit(wint_t wc);
int iswgraph(wint_t wc);
int iswlower(wint_t wc);
int iswprint(wint_t wc);
int iswpunct(wint_t wc);
int iswspace(wint_t wc);
int iswupper(wint_t wc);
int iswxdigit(wint_t wc);
#include <wctype.h>

int iswalpha_l(wint_t wc, locale_t locale);
int iswalnum_l(wint_t wc, locale_t locale);
int iswblank_l(wint_t wc, locale_t locale);
int iswcntrl_l(wint_t wc, locale_t locale);
int iswdigit_l(wint_t wc, locale_t locale);
int iswgraph_l(wint_t wc, locale_t locale);
int iswlower_l(wint_t wc, locale_t locale);
int iswprint_l(wint_t wc, locale_t locale);
int iswpunct_l(wint_t wc, locale_t locale);
int iswspace_l(wint_t wc, locale_t locale);
int iswupper_l(wint_t wc, locale_t locale);
int iswxdigit_l(wint_t wc, locale_t locale);

Description

These functions whose names don't end with _l test whether wc is a wide-character code representing a character of a particular class defined in the LC_CTYPE category of the current locale.

In all cases, wc is a wint_t, the value of which must be a wide-character code corresponding to a valid character in the current locale or must equal the value of the macro WEOF. If the argument has any other values, the behavior is undefined.

iswalpha(wc)

Tests whether wc is a wide-character code representing a character of class "alpha" in the program's current locale.

isenglish(wc)

Tests whether wc is a wide-character code representing an English language character, excluding ASCII characters.

isideogram(wc)

Tests whether wc is a wide-character code representing an ideographic language character, excluding ASCII characters.

isnumber(wc)

Tests whether wc is a wide-character code representing digit [0−9], excluding ASCII characters.

isphonogram(wc)

Tests whether wc is a wide-character code representing a phonetic language character, excluding ASCII characters.

isspecial(wc)

Tests whether wc is a wide-character code representing a special language character, excluding ASCII characters.

iswalnum(wc)

Tests whether wc is a wide-character code representing a character of class "alpha" or "digit" in the program's current locale.

iswascii(wc)

Tests whether wc is a wide-character code representing an ASCII character.

iswblank(wc)

Tests whether wc is a wide-character code representing a character of class “blank” in the program's current locale. This function is not available to applications conforming to standards prior to SUSv3. See standards(7).

iswlower(wc)

Tests whether wc is a wide-character code representing a character of class "lower" in the program's current locale.

iswcntrl(wc)

Tests whether wc is a wide-character code representing a character of class "cntrl" in the program's current locale.

iswdigit(wc)

Tests whether wc is a wide-character code representing a character of class "digit" in the program's current locale.

iswgraph(wc)

Tests whether wc is a wide-character code representing a character of class "graph" in the program's current locale.

iswprint(wc)

Tests whether wc is a wide-character code representing a character of class "print" in the program's current locale.

iswpunct(wc)

Tests whether wc is a wide-character code representing a character of class "punct" in the program's current locale.

iswspace(wc)

Tests whether wc is a wide-character code representing a character of class "space" in the program's current locale.

iswupper(wc)

Tests whether wc is a wide-character code representing a character of class "upper" in the program's current locale.

iswxdigit(wc)

Tests whether wc is a wide-character code representing a character of class "xdigit" in the program's current locale.

Functions whose name end with _l accept locale represented by second argument <locale>, and tests wc in the locale specified, instead of in the current locale. Except which locale the test is done in, same test is done as done by corresponding function whose name doesn't end with _l.

The behavior is undefined if the <locale> argument is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
CSI
Enabled
Interface Stability
See below
MT-Level
MT-Safe

The iswalpha(), iswalnum(), iswblank(), iswcntrl(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(), and iswxdigit() iswalpha_l(), iswalnum_l(), iswblank_l(), iswcntrl_l(), iswdigit_l(), iswgraph_l(), iswlower_l(), iswprint_l(), iswpunct_l(), iswspace_l(), iswupper_l(), and iswxdigit_l() functions are Standard.

See Also

localedef(1), duplocale(3C), freelocale(3C), newlocale(3C), setlocale(3C), stdio(3C), uselocale(3C), ascii(7), attributes(7), standards(7)