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7.1 What Effects a Locale Has

Each locale specifies conventions for several purposes, including the following:

Some aspects of adapting to the specified locale are handled automatically by the library subroutines. For example, all your program needs to do in order to use the collating sequence of the chosen locale is to use strcoll or strxfrm to compare strings.

Other aspects of locales are beyond the comprehension of the library. For example, the library can’t automatically translate your program’s output messages into other languages. The only way you can support output in the user’s favorite language is to program this more or less by hand. The C library provides functions to handle translations for multiple languages easily.

This chapter discusses the mechanism by which you can modify the current locale. The effects of the current locale on specific library functions are discussed in more detail in the descriptions of those functions.

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