mirror of https://github.com/mkerrisk/man-pages
81 lines
2.3 KiB
Groff
81 lines
2.3 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\" ISO/IEC 9899:1999
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.\"
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.TH WCTOMB 3 1999-07-25 "GNU" "Linux Programmer's Manual"
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.SH NAME
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wctomb \- convert a wide character to a multibyte sequence
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.SH SYNOPSIS
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.nf
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.B #include <stdlib.h>
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.sp
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.BI "int wctomb(char *" s ", wchar_t " wc );
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.fi
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.SH DESCRIPTION
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If \fIs\fP is not NULL,
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the
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.BR wctomb ()
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function converts the wide character
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\fIwc\fP to its multibyte representation and stores it at the beginning of
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the character array pointed to by \fIs\fP.
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It updates the shift state, which
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is stored in a static anonymous variable
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only known to the wctomb function,
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and returns the length of said multibyte representation,
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i.e. the number of
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bytes written at \fIs\fP.
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.PP
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The programmer must ensure that there is
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room for at least \fBMB_CUR_MAX\fP
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bytes at \fIs\fP.
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.PP
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If \fIs\fP is NULL, the
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.BR wctomb ()
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function
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.\" The Dinkumware doc and the Single Unix specification say this, but
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.\" glibc doesn't implement this.
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resets the shift state, only known to this function,
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to the initial state, and
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returns non-zero if the encoding has non-trivial shift state,
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or zero if the encoding is stateless.
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.SH "RETURN VALUE"
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If \fIs\fP is not NULL, the
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.BR wctomb ()
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function
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returns the number of bytes
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that have been written to the byte array at \fIs\fP.
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If \fIwc\fP can not be
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represented as a multibyte sequence (according
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to the current locale), \-1 is returned.
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.PP
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If \fIs\fP is NULL, the
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.BR wctomb ()
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function returns non-zero if the
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encoding has non-trivial shift state, or zero if the encoding is stateless.
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.SH "CONFORMING TO"
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C99.
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.SH NOTES
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The behaviour of
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.BR wctomb ()
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depends on the LC_CTYPE category of the
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current locale.
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.PP
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This function is not multi-thread safe.
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The function
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.BR wcrtomb (3)
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provides
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a better interface to the same functionality.
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.SH "SEE ALSO"
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.BR MB_CUR_MAX (3),
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.BR wcrtomb (3),
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.BR wcstombs (3)
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