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84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
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FUNCTION
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<<wcstombs>>---minimal wide char string to multibyte string converter
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INDEX
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wcstombs
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ANSI_SYNOPSIS
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#include <stdlib.h>
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size_t wcstombs(char *restrict <[s]>, const wchar_t *restrict <[pwc]>, size_t <[n]>);
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TRAD_SYNOPSIS
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#include <stdlib.h>
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size_t wcstombs(<[s]>, <[pwc]>, <[n]>)
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char *<[s]>;
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const wchar_t *<[pwc]>;
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size_t <[n]>;
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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 <<wcstombs>>. In this case,
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all wide-characters are expected to represent single bytes and so
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are converted simply by casting to char.
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When _MB_CAPABLE is defined, this routine calls <<_wcstombs_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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RETURNS
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This implementation of <<wcstombs>> returns <<0>> if
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<[s]> is <<NULL>> or is the empty string;
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it returns <<-1>> if _MB_CAPABLE and one of the
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wide-char characters does not represent a valid multi-byte character;
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otherwise it returns the minimum of: <<n>> or the
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number of bytes that are transferred to <<s>>, not including the
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nul terminator.
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If the return value is -1, the state of the <<pwc>> string is
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indeterminate. If the input has a length of 0, the output
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string will be modified to contain a wchar_t nul terminator if
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<<n>> > 0.
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PORTABILITY
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<<wcstombs>> is required in the ANSI C standard. However, the precise
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effects vary with the locale.
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<<wcstombs>> 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 <wchar.h>
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size_t
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_DEFUN (wcstombs, (s, pwcs, n),
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char *__restrict s _AND
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const wchar_t *__restrict pwcs _AND
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size_t n)
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{
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#ifdef _MB_CAPABLE
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mbstate_t state;
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state.__count = 0;
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return _wcstombs_r (_REENT, s, pwcs, n, &state);
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#else /* not _MB_CAPABLE */
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int count = 0;
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if (n != 0) {
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do {
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if ((*s++ = (char) *pwcs++) == 0)
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break;
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count++;
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} while (--n != 0);
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}
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return count;
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#endif /* not _MB_CAPABLE */
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}
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#endif /* !_REENT_ONLY */
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