Chapter 6. LOCALE technology

61

  encoding (

CODESET

)

For example, you can get names for months and use them for your original output algorithm.

YESEXPR

and

NOEXPR

are convenient for softwares expecting Y/N answer from users.

iconv_open()

,

iconv()

, and

iconv_close()

are functions to perform conversion between

encodings. Please consult manpages for them.

Combining

nl_langinfo()

and

iconv()

, you can easily modify Unicode enabled software

into locale sensible truly internationalized software.

At first, add a line of

setlocale(LC_ALL,   );

at the first of the software. If it returns non 

NULL, enable UTF 8 mode of the software.

int conversion = FALSE;

char *locale = setlocale(LC_ALL, "");

:

:

(original code to determine UTF 8 mode or not)

:

:

if (locale != NULL && utf_mode == FALSE) {

utf8_mode = TRUE;

conversion = TRUE;

}

Then modify input routine as following:

#define INTERNALCODE "UTF 8"

if (conversion == TRUE) {

char *fromcode = nl_langinfo(CODESET);

iconv_t conv = iconv_open(INTERNALCODE, fromcode);

(reading and conversion...)

iconv_close(conv);

} else {

(original reading routine)

}

Finally modify the output routine as following:

if (conversion == TRUE) {

char *tocode = nl_langinfo(CODESET);