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_ismbb routines

Tests the given integer value c for a particular condition, by using the current locale or a specified LC_CTYPE conversion state category.

Remarks

Every routine in the _ismbb family tests the given integer value c for a particular condition. The test result depends on the multibyte code page that's in effect. By default, the multibyte code page is set to the ANSI code page that's obtained from the operating system at program startup. You can use _getmbcp to query for the multibyte code page that's in use, or _setmbcp to change it.

The output value is affected by the setting of the LC_CTYPE category setting of the locale; for more information, see setlocale, _wsetlocale. The versions of these functions that don't have the _l suffix use the current locale for this locale-dependent behavior; the versions that do have the _l suffix are identical except that instead they use the locale parameter that's passed in.

The routines in the _ismbb family test the given integer c as follows.

Routine Byte test condition
_ismbbalnum isalnum(c) || _ismbbkalnum(c)
_ismbbalpha isalpha(c) || _ismbbkalpha(c)
_ismbbblank isblank(c)
_ismbbgraph Same as _ismbbprint, but _ismbbgraph doesn't include the space character (0x20)
_ismbbkalnum Non-ASCII text symbol other than punctuation. For example, in code page 932 only, _ismbbkalnum tests for katakana alphanumeric
_ismbbkana Katakana (0xA1 - 0xDF). Specific to code page 932
_ismbbkprint Non-ASCII text or non-ASCII punctuation symbol. For example, in code page 932 only, _ismbbkprint tests for katakana alphanumeric or katakana punctuation (range: 0xA1 - 0xDF)
_ismbbkpunct Non-ASCII punctuation. For example, in code page 932 only, _ismbbkpunct tests for katakana punctuation
_ismbblead First byte of multibyte character. For example, in code page 932 only, valid ranges are 0x81 - 0x9F, 0xE0 - 0xFC
_ismbbprint isprint(c) || _ismbbkprint(c). ismbbprint includes the space character (0x20)
_ismbbpunct ispunct(c) || _ismbbkpunct(c).
_ismbbtrail Second byte of multibyte character. For example, in code page 932 only, valid ranges are 0x40 - 0x7E, 0x80 - 0xEC

The following table shows the |-combined values that compose the test conditions for these routines. The manifest constants _BLANK, _DIGIT, _LOWER, _PUNCT, and _UPPER are defined in ctype.h.

Routine _BLANK _DIGIT LOWER _PUNCT UPPER Non-ASCII
text
Non-ASCII
punctuation
_ismbbalnum x x x x
_ismbbalpha x x x
_ismbbblank x
_ismbbgraph x x x x x x
_ismbbkalnum x
_ismbbkprint x x
_ismbbkpunct x
_ismbbprint x x x x x x x
_ismbbpunct x x

The _ismbb routines are implemented both as functions and as macros. For more information about how to choose either implementation, see Recommendations for choosing between functions and macros.

See also

Byte classification
is, isw routines
_mbbtombc, _mbbtombc_l
_mbctombb, _mbctombb_l