#include <stdio.h>
#include <locale.h>
#include <langinfo.h>
/* This test sets up the British English locale, and then */
/* inquires on the data and time format, first day of the week, */
/* and abbreviated first day of the week. */
#include <stdlib.h>
#include <string.h>
int main()
{
char *return_val;
char *nl_ptr;
/* set the locale, with user supplied locale name */
return_val = setlocale(LC_ALL, "en_gb.iso8859-1");
if (return_val == NULL) {
printf("ERROR : The locale is unknown");
exit(1);
}
printf("+----------------------------------------+\n");
/* Get the date and time format from the locale. */
printf("D_T_FMT = ");
/* Compare the returned string from nl_langinfo with */
/* an empty string. */
if (!strcmp((nl_ptr = (char *) nl_langinfo(D_T_FMT)), "")) {
/* The string returned was empty this could mean that either */
/* 1) The locale does not contain a value for this item */
/* 2) The value for this item is an empty string */
printf("nl_langinfo returned an empty string\n");
}
else {
/* Display the date and time format */
printf("%s\n", nl_ptr);
}
/* Get the full name for the first day of the week from locale */
printf("DAY_1 = ");
/* Compare the returned string from nl_langinfo with */
/* an empty string. */
if (!strcmp((nl_ptr = (char *) nl_langinfo(DAY_1)), "")) {
/* The string returned was empty this could mean that either */
/* 1) The locale does not contain a value for the first */
/* day of the week */
/* 2) The value for the first day of the week is */
/* an empty string */
printf("nl_langinfo returned an empty string\n");
}
else {
/* Display the full name of the first day of the week */
printf("%s\n", nl_ptr);
}
/* Get the abbreviated name for the first day of the week from locale*/
printf("ABDAY_1 = ");
/* Compare the returned string from nl_
langinfo with an empty */
/* string. */
if (!strcmp((nl_ptr = (char *) nl_langinfo(ABDAY_1)), "")) {
/* The string returned was empty this could mean that either */
/* 1) The locale does not contain a value for the first */
/* day of the week */
/* 2) The value for the first day of the week is an */
/* empty string */
printf("nl_langinfo returned an empty string\n");
}
else {
/* Display the abbreviated name of the first day of the week */
printf("%s\n", nl_ptr);
}
}
Running the example program produces the following result:
+----------------------------------------+
D_T_FMT = %a %e %b %H:%M:%S %Y
DAY_1 = Sunday
ABDAY_1 = Sun