| mbrtowc.3 (20a95cd6fc7b52daa224c3d30b8cf263b9292abd) | mbrtowc.3 (50c77c6e8b152e463f99c4e9225f5603c02d979c) |
|---|---|
| 1.\" Copyright (c) 2002-2004 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. --- 10 unchanged lines hidden (view full) --- 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.\" $FreeBSD$ 26.\" | 1.\" Copyright (c) 2002-2004 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. --- 10 unchanged lines hidden (view full) --- 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.\" $FreeBSD$ 26.\" |
| 27.Dd April 8, 2004 | 27.Dd May 21, 2013 |
| 28.Dt MBRTOWC 3 29.Os 30.Sh NAME | 28.Dt MBRTOWC 3 29.Os 30.Sh NAME |
| 31.Nm mbrtowc | 31.Nm mbrtowc , 32.Nm mbrtoc16 , 33.Nm mbrtoc32 |
| 32.Nd "convert a character to a wide-character code (restartable)" 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In wchar.h 37.Ft size_t 38.Fo mbrtowc | 34.Nd "convert a character to a wide-character code (restartable)" 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In wchar.h 39.Ft size_t 40.Fo mbrtowc |
| 39.Fa "wchar_t * restrict pwc" "const char * restrict s" "size_t n" | 41.Fa "wchar_t * restrict pc" "const char * restrict s" "size_t n" |
| 40.Fa "mbstate_t * restrict ps" 41.Fc | 42.Fa "mbstate_t * restrict ps" 43.Fc |
| 44.In uchar.h 45.Ft size_t 46.Fo mbrtoc16 47.Fa "char16_t * restrict pc" "const char * restrict s" "size_t n" 48.Fa "mbstate_t * restrict ps" 49.Fc 50.Ft size_t 51.Fo mbrtoc32 52.Fa "char32_t * restrict pc" "const char * restrict s" "size_t n" 53.Fa "mbstate_t * restrict ps" 54.Fc |
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| 42.Sh DESCRIPTION 43The | 55.Sh DESCRIPTION 56The |
| 44.Fn mbrtowc 45function inspects at most | 57.Fn mbrtowc , 58.Fn mbrtoc16 59and 60.Fn mbrtoc32 61functions inspect at most |
| 46.Fa n 47bytes pointed to by 48.Fa s 49to determine the number of bytes needed to complete the next multibyte 50character. 51If a character can be completed, and | 62.Fa n 63bytes pointed to by 64.Fa s 65to determine the number of bytes needed to complete the next multibyte 66character. 67If a character can be completed, and |
| 52.Fa pwc | 68.Fa pc |
| 53is not 54.Dv NULL , 55the wide character which is represented by 56.Fa s 57is stored in the | 69is not 70.Dv NULL , 71the wide character which is represented by 72.Fa s 73is stored in the |
| 58.Vt wchar_t | 74.Vt wchar_t , 75.Vt char16_t 76or 77.Vt char32_t |
| 59it points to. 60.Pp 61If 62.Fa s 63is 64.Dv NULL , | 78it points to. 79.Pp 80If 81.Fa s 82is 83.Dv NULL , |
| 65.Fn mbrtowc 66behaves as if 67.Fa pwc | 84these functions behave as if 85.Fa pc |
| 68was 69.Dv NULL , 70.Fa s 71was an empty string 72.Pq Qq 73and 74.Fa n 75was 1. 76.Pp 77The 78.Vt mbstate_t 79argument, 80.Fa ps , 81is used to keep track of the shift state. 82If it is 83.Dv NULL , | 86was 87.Dv NULL , 88.Fa s 89was an empty string 90.Pq Qq 91and 92.Fa n 93was 1. 94.Pp 95The 96.Vt mbstate_t 97argument, 98.Fa ps , 99is used to keep track of the shift state. 100If it is 101.Dv NULL , |
| 84.Fn mbrtowc 85uses an internal, static | 102these functions use an internal, static |
| 86.Vt mbstate_t 87object, which is initialized to the initial conversion state 88at program startup. | 103.Vt mbstate_t 104object, which is initialized to the initial conversion state 105at program startup. |
| 106.Pp 107As a single 108.Vt char16_t 109is not large enough to represent certain multibyte characters, the 110.Fn mbrtoc16 111function may need to be invoked multiple times to convert a single 112multibyte character sequence. |
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| 89.Sh RETURN VALUES 90The | 113.Sh RETURN VALUES 114The |
| 91.Fn mbrtowc 92functions returns: | 115.Fn mbrtowc , 116.Fn mbrtoc16 117and 118.Fn mbrtoc32 119functions return: |
| 93.Bl -tag -width indent 94.It 0 95The next 96.Fa n 97or fewer bytes 98represent the null wide character 99.Pq Li "L'\e0'" . 100.It >0 101The next 102.Fa n | 120.Bl -tag -width indent 121.It 0 122The next 123.Fa n 124or fewer bytes 125represent the null wide character 126.Pq Li "L'\e0'" . 127.It >0 128The next 129.Fa n |
| 103or fewer bytes 104represent a valid character, 105.Fn mbrtowc 106returns the number of bytes used to complete the multibyte character. | 130or fewer bytes represent a valid character, these functions 131return the number of bytes used to complete the multibyte character. 132.It Po Vt size_t Pc Ns \-1 133An encoding error has occurred. 134The next 135.Fa n 136or fewer bytes do not contribute to a valid multibyte character. |
| 107.It Po Vt size_t Pc Ns \-2 108The next 109.Fa n 110contribute to, but do not complete, a valid multibyte character sequence, 111and all 112.Fa n 113bytes have been processed. | 137.It Po Vt size_t Pc Ns \-2 138The next 139.Fa n 140contribute to, but do not complete, a valid multibyte character sequence, 141and all 142.Fa n 143bytes have been processed. |
| 114.It Po Vt size_t Pc Ns \-1 115An encoding error has occurred. 116The next 117.Fa n 118or fewer bytes do not contribute to a valid multibyte character. | |
| 119.El | 144.El |
| 145.Pp 146The 147.Fn mbrtoc16 148function also returns: 149.Bl -tag -width indent 150.It Po Vt size_t Pc Ns \-3 151The next character resulting from a previous call has been stored. 152No bytes from the input have been consumed. 153.El |
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| 120.Sh ERRORS 121The | 154.Sh ERRORS 155The |
| 122.Fn mbrtowc 123function will fail if: | 156.Fn mbrtowc , 157.Fn mbrtoc16 158and 159.Fn mbrtoc32 160functions will fail if: |
| 124.Bl -tag -width Er 125.It Bq Er EILSEQ 126An invalid multibyte sequence was detected. 127.It Bq Er EINVAL 128The conversion state is invalid. 129.El 130.Sh SEE ALSO 131.Xr mbtowc 3 , 132.Xr multibyte 3 , 133.Xr setlocale 3 , 134.Xr wcrtomb 3 135.Sh STANDARDS 136The | 161.Bl -tag -width Er 162.It Bq Er EILSEQ 163An invalid multibyte sequence was detected. 164.It Bq Er EINVAL 165The conversion state is invalid. 166.El 167.Sh SEE ALSO 168.Xr mbtowc 3 , 169.Xr multibyte 3 , 170.Xr setlocale 3 , 171.Xr wcrtomb 3 172.Sh STANDARDS 173The |
| 137.Fn mbrtowc 138function conforms to 139.St -isoC-99 . | 174.Fn mbrtowc , 175.Fn mbrtoc16 176and 177.Fn mbrtoc32 178functions conform to 179.St -isoC-2011 . |