74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*
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FUNCTION
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<<wctomb>>---minimal wide char to multibyte converter
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INDEX
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wctomb
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SYNOPSIS
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#include <stdlib.h>
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int wctomb(char *<[s]>, wchar_t <[wchar]>);
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DESCRIPTION
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When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
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implementation of <<wctomb>>. The
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only ``wide characters'' recognized are single bytes,
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and they are ``converted'' to themselves.
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When _MB_CAPABLE is defined, this routine calls <<_wctomb_r>> to perform
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the conversion, passing a state variable to allow state dependent
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decoding. The result is based on the locale setting which may
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be restricted to a defined set of locales.
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Each call to <<wctomb>> modifies <<*<[s]>>> unless <[s]> is a null
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pointer or _MB_CAPABLE is defined and <[wchar]> is invalid.
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RETURNS
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This implementation of <<wctomb>> returns <<0>> if
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<[s]> is <<NULL>>; it returns <<-1>> if _MB_CAPABLE is enabled
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and the wchar is not a valid multi-byte character, it returns <<1>>
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if _MB_CAPABLE is not defined or the wchar is in reality a single
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byte character, otherwise it returns the number of bytes in the
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multi-byte character.
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PORTABILITY
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<<wctomb>> is required in the ANSI C standard. However, the precise
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effects vary with the locale.
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<<wctomb>> requires no supporting OS subroutines.
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*/
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#ifndef _REENT_ONLY
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#include <newlib.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "local.h"
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int
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wctomb (char *s,
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wchar_t wchar)
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{
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#ifdef _MB_CAPABLE
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struct _reent *reent = _REENT;
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_REENT_CHECK_MISC(reent);
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return __WCTOMB (reent, s, wchar, &(_REENT_WCTOMB_STATE(reent)));
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#else /* not _MB_CAPABLE */
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if (s == NULL)
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return 0;
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/* Verify that wchar is a valid single-byte character. */
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if ((size_t)wchar >= 0x100) {
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errno = EILSEQ;
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return -1;
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}
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*s = (char) wchar;
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return 1;
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#endif /* not _MB_CAPABLE */
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}
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#endif /* !_REENT_ONLY */
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