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#include <locale.h>
The header <locale.h> declares data types, functions and macros which are useful in this task.
The functions it declares are setlocale(3) to set the current locale, and localeconv(3) to get information about number formatting.
There are different categories for local information a program might need; they are declared as macros. Using them as the first argument to the setlocale(3) function, it is possible to set one of these to the desired locale:
If the second argument to setlocale(3) is empty string, "", for the default locale, it is determined using the following steps:
Values about local numeric formatting is made available in a struct lconv returned by the localeconv(3) function, which has the following declaration:
struct lconv { /* Numeric (nonmonetary) information */ char *decimal_point; /* Radix character */ char *thousands_sep; /* Separator for digit groups to left of radix character */ char *grouping; /* Each element is the number of digits in a group; elements with higher indices are further left. An element with value CHAR_MAX means that no further grouping is done. An element with value 0 means that the previous element is used for all groups further left. */ /* Remaining fields are for monetary information */ char *int_curr_symbol; /* First three chars are a currency symbol from ISO 4217. Fourth char is the separator. Fifth char is '\0'. */ char *currency_symbol; /* Local currency symbol */ char *mon_decimal_point; /* Radix character */ char *mon_thousands_sep; /* Like thousands_sep above */ char *mon_grouping; /* Like grouping above */ char *positive_sign; /* Sign for positive values */ char *negative_sign; /* Sign for negative values */ char int_frac_digits; /* International fractional digits */ char frac_digits; /* Local fractional digits */ char p_cs_precedes; /* 1 if currency_symbol precedes a positive value, 0 if succeeds */ char p_sep_by_space; /* 1 if a space separates currency_symbol from a positive value */ char n_cs_precedes; /* 1 if currency_symbol precedes a negative value, 0 if succeeds */ char n_sep_by_space; /* 1 if a space separates currency_symbol from a negative value */ /* Positive and negative sign positions: 0 Parentheses surround the quantity and currency_symbol. 1 The sign string precedes the quantity and currency_symbol. 2 The sign string succeeds the quantity and currency_symbol. 3 The sign string immediately precedes the currency_symbol. 4 The sign string immediately succeeds the currency_symbol. */ char p_sign_posn; char n_sign_posn; };
The GNU gettext functions are specified in LI18NUX2000.