Проект OpenNet: MAN wcwidth (3) Библиотечные вызовы (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

wcwidth (3)

wcwidth (3) ( Solaris man: Библиотечные вызовы )

>> wcwidth (3) ( FreeBSD man: Библиотечные вызовы )

wcwidth (3) ( Русские man: Библиотечные вызовы )

wcwidth (3) ( Linux man: Библиотечные вызовы )

wcwidth (3) ( POSIX man: Библиотечные вызовы )

BSD mandoc

NAME



wcwidth

 - number of column positions of a wide-character code

LIBRARY

Lb libc

SYNOPSIS

#include <wchar.h>
int wcwidth (wchar_t wc);

DESCRIPTION

The wcwidth ();
function determines the number of column positions required to display the wide character Fa wc .

RETURN VALUES

The wcwidth ();
function returns 0 if the Fa wc argument is a null wide character (L'\0'), -1 if Fa wc is not printable, otherwise it returns the number of column positions the character occupies.

EXAMPLES

This code fragment reads text from standard input and breaks lines that are more than 20 column positions wide, similar to the fold(1) utility:

wint_t ch;
int column, w;

column = 0;
while ((ch = getwchar()) != WEOF) {
        w = wcwidth(ch);
        if (w > 0 && column + w >= 20) {
                putwchar(L'\n');
                column = 0;
        }
        putwchar(ch);
        if (ch == L'\n')
                column = 0;
        else if (w > 0)
                column += w;
}