wcwidth3
Number of column positions of a wide-character code
Usage
#include <wchar.h>
int
wcwidth(wchar_t wc);
Library
Standard C Library (libc, -lc)
Overview
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;
}
Releases
56 releases since FreeBSD 5.0-RELEASE; the text changed 33 times.