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Man Pages


Manual Reference Pages  -  WCWIDTH (3)

NAME

wcwidth - number of column positions of a wide-character code

CONTENTS

Library
Synopsis
Description
Return Values
Examples
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In wchar.h int wcwidth wchar_t wc

DESCRIPTION

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

RETURN VALUES

The wcwidth function returns 0 if the wc argument is a null wide character (L’\0’), -1 if 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; }

SEE ALSO

iswprint(3), wcswidth(3)

STANDARDS

The wcwidth function conforms to -p1003.1-2001.
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