Datasheet

The C and C++ Libraries

Using the macros

The data blocks for a single locale category must be contiguous and the

LC_INDEX_END macro must be the last macro in the sequence.

The examples in each locale category use two test macros that are defined as:

#define EQI(i,j) assert(i==j)

#define EQS(s,t) assert(!strcmp(s,t))

4.6.4 _get_lc_ctype()

The ctype implementation is selected at link time to be either:

• The C locale only. This is the default.

• The ISO 8859 (Latin-1) locale.

You can define your own ctype attribute table with the following characteristics:

• It must be read-only.

• It is a byte array with indexes ranging from –1 to 255 inclusive (257 bytes in total)

• Each byte is interpreted as eight attribute bits. The values are defined in

ctype.h

as follows:

__S white-space characters

__P punctuation characters

__B blank characters

__L lowercase letters

__U uppercase letters

__N decimal digits

__C control characters

__X hexadecimal-digit letters A-F and a-f.

The first element in the array, the element located at –1, must be zero. A skeletal

implementation of the functions that return CTYPE data is shown in Example 4-3.

Example 4-3 LC_CTYPE_DEF Table

__LC_CTYPE_DEF(lcctype_c, "C")

{

__C, __C, __C, __C, __C, __C, __C, __C, __C, /* 0x00-0x08 */

__C+__S,__C+__S,__C+__S,__C+__S,__C+__S, /* 0x09-0x0D (BS,LF,VT,FF,CR) */