The ifx_gl_ismalnum() function

The ifx_gl_ismalnum() function determines whether a multibyte character contains an alphabetic or digit character.

Syntax

#include <ifxgls.h>
...
int ifx_gl_ismalnum(mb, mb_byte_limit)
       gl_mchar_t *mb;
       int mb_byte_limit;

mb: A pointer to the multibyte character whose character classification you want to determine.
mb_byte_limit: The integer number of bytes to read from mb to try to form a complete multibyte character. If mb_byte_limit is IFX_GL_NO_LIMIT, the ifx_gl_ismalnum() function reads as many bytes as necessary from mb to form a complete character.


Valid in client application	Valid in DataBlade® UDR
Yes	Yes

Usage

The ifx_gl_ismalnum() function tests whether mb is in the alnum character class (either the alpha or digit class) according to the rules of the current locale. The alpha class contains all characters from the upper and lower classes. The digit class contains only the 10 ASCII digit characters: '0' to '9' (ASCII 0x030 to 0x039).

To determine whether a multibyte character is defined only in the alpha class, use the ifx_gl_ismalpha() function. To determine whether a multibyte character is defined only in the digit class, use the ifx_gl_ismdigit() function.

Locale information

The LC_CTYPE category of the current locale affects the behavior of this function because it defines the alnum character class.

Return values

>0: The *mb character is in the alpha or digit character class.
0: The function was not successful, and the error number is set to indicate the cause. See the Errors section.

Errors

This function does not return a unique value to indicate an error. If an error occurred, the function returns 0 and sets the ifx_gl_lc_errno() error number to one of the following values.

IFX_GL_EILSEQ: The *mb value is not a valid multibyte character.
IFX_GL_EINVAL: The function cannot determine whether mb is a valid multibyte character because it would need to read more than mb_byte_limit bytes from mb. If mb_byte_limit is less than or equal to 0, this function always returns this error.