| | 1 | .\" Copyright (c) 2002 Tim J. Robbins |
| | 2 | .\" All rights reserved. |
| | 3 | .\" |
| | 4 | .\" Redistribution and use in source and binary forms, with or without |
| | 5 | .\" modification, are permitted provided that the following conditions |
| | 6 | .\" are met: |
| | 7 | .\" 1. Redistributions of source code must retain the above copyright |
| | 8 | .\" notice, this list of conditions and the following disclaimer. |
| | 9 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 10 | .\" notice, this list of conditions and the following disclaimer in the |
| | 11 | .\" documentation and/or other materials provided with the distribution. |
| | 12 | .\" |
| | 13 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| | 14 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 15 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 16 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| | 17 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 18 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 19 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 20 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 21 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 22 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 23 | .\" SUCH DAMAGE. |
| | 24 | .\" |
| | 25 | .\" $FreeBSD: src/lib/libc/locale/wcwidth.3,v 1.6 2004/08/17 04:56:03 trhodes Exp $ |
| | 26 | .\" |
| | 27 | .Dd August 17, 2004 |
| | 28 | .Dt WCWIDTH 3 |
| | 29 | .Os |
| | 30 | .Sh NAME |
| | 31 | .Nm wcwidth , |
| | 32 | .Nm wcwidth_l |
| | 33 | .Nd "number of column positions of a wide-character code" |
| | 34 | .Sh LIBRARY |
| | 35 | .Lb libc |
| | 36 | .Sh SYNOPSIS |
| | 37 | .In wchar.h |
| | 38 | .Ft int |
| | 39 | .Fo wcwidth |
| | 40 | .Fa "wchar_t wc" |
| | 41 | .Fc |
| | 42 | .In wchar.h |
| | 43 | .In xlocale.h |
| | 44 | .Ft int |
| | 45 | .Fo wcwidth_l |
| | 46 | .Fa "wchar_t wc" |
| | 47 | .Fa "locale_t loc" |
| | 48 | .Fc |
| | 49 | .Sh DESCRIPTION |
| | 50 | The |
| | 51 | .Fn wcwidth |
| | 52 | function determines the number of column positions required to |
| | 53 | display the wide character |
| | 54 | .Fa wc . |
| | 55 | .Pp |
| | 56 | Although the |
| | 57 | .Fn wcwidth |
| | 58 | function uses the current locale, the |
| | 59 | .Fn wcwidth_l |
| | 60 | function may be passed a locale directly. See |
| | 61 | .Xr xlocale 3 |
| | 62 | for more information. |
| | 63 | .Sh RETURN VALUES |
| | 64 | The |
| | 65 | .Fn wcwidth |
| | 66 | function returns 0 if the |
| | 67 | .Fa wc |
| | 68 | argument is a null wide character (L'\e0'), |
| | 69 | \-1 if |
| | 70 | .Fa wc |
| | 71 | is not printable; |
| | 72 | otherwise, it returns the number of column positions the |
| | 73 | character occupies. |
| | 74 | .Sh EXAMPLES |
| | 75 | This code fragment reads text from standard input and |
| | 76 | breaks lines that are more than 20 column positions wide, |
| | 77 | similar to the |
| | 78 | .Xr fold 1 |
| | 79 | utility: |
| | 80 | .Bd -literal -offset indent |
| | 81 | wint_t ch; |
| | 82 | int column, w; |
| | 83 | |
| | 84 | column = 0; |
| | 85 | while ((ch = getwchar()) != WEOF) { |
| | 86 | w = wcwidth(ch); |
| | 87 | if (w > 0 && column + w >= 20) { |
| | 88 | putwchar(L'\en'); |
| | 89 | column = 0; |
| | 90 | } |
| | 91 | putwchar(ch); |
| | 92 | if (ch == L'\en') |
| | 93 | column = 0; |
| | 94 | else if (w > 0) |
| | 95 | column += w; |
| | 96 | } |
| | 97 | .Ed |
| | 98 | .Sh SEE ALSO |
| | 99 | .Xr iswprint 3 , |
| | 100 | .Xr wcswidth 3 , |
| | 101 | .Xr xlocale 3 |
| | 102 | .Sh STANDARDS |
| | 103 | The |
| | 104 | .Fn wcwidth |
| | 105 | function conforms to |
| | 106 | .St -p1003.1-2001 . |
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