| | 1 | .\" Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved. |
| | 2 | .\" Copyright (c) 1993 |
| | 3 | .\" The Regents of the University of California. All rights reserved. |
| | 4 | .\" |
| | 5 | .\" This code is derived from software contributed to Berkeley by |
| | 6 | .\" Donn Seeley of BSDI. |
| | 7 | .\" |
| | 8 | .\" Redistribution and use in source and binary forms, with or without |
| | 9 | .\" modification, are permitted provided that the following conditions |
| | 10 | .\" are met: |
| | 11 | .\" 1. Redistributions of source code must retain the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer. |
| | 13 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 14 | .\" notice, this list of conditions and the following disclaimer in the |
| | 15 | .\" documentation and/or other materials provided with the distribution. |
| | 16 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 17 | .\" may be used to endorse or promote products derived from this software |
| | 18 | .\" without specific prior written permission. |
| | 19 | .\" |
| | 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 30 | .\" SUCH DAMAGE. |
| | 31 | .\" |
| | 32 | .\" From @(#)multibyte.3 8.1 (Berkeley) 6/4/93 |
| | 33 | .\" From FreeBSD: src/lib/libc/locale/multibyte.3,v 1.22 2003/11/08 03:23:11 tjr Exp |
| | 34 | .\" $FreeBSD: src/lib/libc/locale/mblen.3,v 1.6 2007/01/09 00:28:00 imp Exp $ |
| | 35 | .\" |
| | 36 | .Dd April 11, 2004 |
| | 37 | .Dt MBLEN 3 |
| | 38 | .Os |
| | 39 | .Sh NAME |
| | 40 | .Nm mblen , |
| | 41 | .Nm mblen_l |
| | 42 | .Nd get number of bytes in a character |
| | 43 | .Sh LIBRARY |
| | 44 | .Lb libc |
| | 45 | .Sh SYNOPSIS |
| | 46 | .In stdlib.h |
| | 47 | .Ft int |
| | 48 | .Fo mblen |
| | 49 | .Fa "const char *s" |
| | 50 | .Fa "size_t n" |
| | 51 | .Fc |
| | 52 | .In stdlib.h |
| | 53 | .In xlocale.h |
| | 54 | .Ft int |
| | 55 | .Fo mblen_l |
| | 56 | .Fa "const char *s" |
| | 57 | .Fa "size_t n" |
| | 58 | .Fa "locale_t loc" |
| | 59 | .Fc |
| | 60 | .Sh DESCRIPTION |
| | 61 | The |
| | 62 | .Fn mblen |
| | 63 | function computes the length, in bytes, |
| | 64 | of a multibyte character |
| | 65 | .Fa s , |
| | 66 | according to the current conversion state. |
| | 67 | Up to |
| | 68 | .Fa n |
| | 69 | bytes are examined. |
| | 70 | .Pp |
| | 71 | A call with a null |
| | 72 | .Fa s |
| | 73 | pointer returns nonzero if the current locale requires shift states, |
| | 74 | zero otherwise. |
| | 75 | If shift states are required, the shift state is reset to the initial state. |
| | 76 | .Pp |
| | 77 | Although the |
| | 78 | .Fn mblen |
| | 79 | function uses the current locale, the |
| | 80 | .Fn mblen_l |
| | 81 | function may be passed a locale directly. See |
| | 82 | .Xr xlocale 3 |
| | 83 | for more information. |
| | 84 | .Sh RETURN VALUES |
| | 85 | If |
| | 86 | .Fa s |
| | 87 | is |
| | 88 | .Dv NULL , |
| | 89 | the |
| | 90 | .Fn mblen |
| | 91 | function returns nonzero if shift states are supported, |
| | 92 | zero otherwise. |
| | 93 | .Pp |
| | 94 | Otherwise, if |
| | 95 | .Fa s |
| | 96 | is not a null pointer, |
| | 97 | .Fn mblen |
| | 98 | either returns 0 if |
| | 99 | .Fa s |
| | 100 | represents the null wide character, or returns |
| | 101 | the number of bytes processed in |
| | 102 | .Fa s , |
| | 103 | or returns \-1 if no multibyte character |
| | 104 | could be recognized or converted. |
| | 105 | In this case, |
| | 106 | .Fn mblen Ns 's |
| | 107 | internal conversion state is undefined. |
| | 108 | .Sh ERRORS |
| | 109 | The |
| | 110 | .Fn mblen |
| | 111 | function will fail if: |
| | 112 | .Bl -tag -width Er |
| | 113 | .It Bq Er EILSEQ |
| | 114 | An invalid multibyte sequence was detected. |
| | 115 | .It Bq Er EINVAL |
| | 116 | The internal conversion state is not valid. |
| | 117 | .El |
| | 118 | .Sh SEE ALSO |
| | 119 | .Xr mbrlen 3 , |
| | 120 | .Xr mbtowc 3 , |
| | 121 | .Xr multibyte 3 , |
| | 122 | .Xr xlocale 3 |
| | 123 | .Sh STANDARDS |
| | 124 | The |
| | 125 | .Fn mblen |
| | 126 | function conforms to |
| | 127 | .St -isoC-99 . |
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