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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [wcstombs.c] - Rev 214
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/* FUNCTION <<wcstombs>>---minimal wide char string to multibyte string converter INDEX wcstombs ANSI_SYNOPSIS #include <stdlib.h> size_t wcstombs(char *<[s]>, const wchar_t *<[pwc]>, size_t <[n]>); TRAD_SYNOPSIS #include <stdlib.h> size_t wcstombs(<[s]>, <[pwc]>, <[n]>) char *<[s]>; const wchar_t *<[pwc]>; size_t <[n]>; DESCRIPTION When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming implementation of <<wcstombs>>. In this case, all wide-characters are expected to represent single bytes and so are converted simply by casting to char. When _MB_CAPABLE is defined, this routine calls <<_wcstombs_r>> to perform the conversion, passing a state variable to allow state dependent decoding. The result is based on the locale setting which may be restricted to a defined set of locales. RETURNS This implementation of <<wcstombs>> returns <<0>> if <[s]> is <<NULL>> or is the empty string; it returns <<-1>> if _MB_CAPABLE and one of the wide-char characters does not represent a valid multi-byte character; otherwise it returns the minimum of: <<n>> or the number of bytes that are transferred to <<s>>, not including the nul terminator. If the return value is -1, the state of the <<pwc>> string is indeterminate. If the input has a length of 0, the output string will be modified to contain a wchar_t nul terminator if <<n>> > 0. PORTABILITY <<wcstombs>> is required in the ANSI C standard. However, the precise effects vary with the locale. <<wcstombs>> requires no supporting OS subroutines. */ #ifndef _REENT_ONLY #include <newlib.h> #include <stdlib.h> #include <wchar.h> size_t _DEFUN (wcstombs, (s, pwcs, n), char *s _AND const wchar_t *pwcs _AND size_t n) { #ifdef _MB_CAPABLE mbstate_t state; state.__count = 0; return _wcstombs_r (_REENT, s, pwcs, n, &state); #else /* not _MB_CAPABLE */ int count = 0; if (n != 0) { do { if ((*s++ = (char) *pwcs++) == 0) break; count++; } while (--n != 0); } return count; #endif /* not _MB_CAPABLE */ } #endif /* !_REENT_ONLY */
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