Chapter 9. Internal Processing and File I/O

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#include 

#include 

int main(int argc, char **argv)

{

int len, n;

wchar_t *wp;

/* All softwares using locale should write this line */

setlocale(LC_ALL, "");

if (argc < 2) {

printf("Usage: %s [string]\n", argv[0]);

return 0;

}

printf("Your string is: \"%s\".\n", argv[1]);

/* The concept of 'byte' is universal. */

len = strlen(argv[1]);

printf("Length of your string is: %d bytes.\n", len);

/* To obtain number of characters, it is the easiest way */

/* to convert the string into wide string.

The number of */

/* characters is equal to the number of wide characters. */

/* It does not exceed the number of bytes. */

n = strlen(argv[1]) * sizeof(wchar_t);

wp = (wchar_t *)malloc(n);

len = mbstowcs(wp, argv[1], n);

printf("Length of your string is: %d characters.\n", len);

printf("Width of your string is: %d columns.\n", wcswidth(wp, len));

return 0;

}

This program can count multibyte characters correctly. Of course the user has to set LANG vari 

able properly.

For example, on UTF 8 xterm. . .

$ export LANG=ko_KR.UTF 8