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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdlib/] [mbstowcs.c] - Rev 217
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/* FUNCTION <<mbstowcs>>---minimal multibyte string to wide char converter INDEX mbstowcs ANSI_SYNOPSIS #include <stdlib.h> int mbstowcs(wchar_t *<[pwc]>, const char *<[s]>, size_t <[n]>); TRAD_SYNOPSIS #include <stdlib.h> int mbstowcs(<[pwc]>, <[s]>, <[n]>) wchar_t *<[pwc]>; const char *<[s]>; size_t <[n]>; DESCRIPTION When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming implementation of <<mbstowcs>>. In this case, the only ``multi-byte character sequences'' recognized are single bytes, and they are ``converted'' to wide-char versions simply by byte extension. When _MB_CAPABLE is defined, this routine calls <<_mbstowcs_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 <<mbstowcs>> returns <<0>> if <[s]> is <<NULL>> or is the empty string; it returns <<-1>> if _MB_CAPABLE and one of the multi-byte characters is invalid or incomplete; otherwise it returns the minimum of: <<n>> or the number of multi-byte characters in <<s>> plus 1 (to compensate for the nul character). 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. PORTABILITY <<mbstowcs>> is required in the ANSI C standard. However, the precise effects vary with the locale. <<mbstowcs>> requires no supporting OS subroutines. */ #ifndef _REENT_ONLY #include <newlib.h> #include <stdlib.h> #include <wchar.h> size_t _DEFUN (mbstowcs, (pwcs, s, n), wchar_t *pwcs _AND const char *s _AND size_t n) { #ifdef _MB_CAPABLE mbstate_t state; state.__count = 0; return _mbstowcs_r (_REENT, pwcs, s, n, &state); #else /* not _MB_CAPABLE */ int count = 0; if (n != 0) { do { if ((*pwcs++ = (wchar_t) *s++) == 0) break; count++; } while (--n != 0); } return count; #endif /* not _MB_CAPABLE */ } #endif /* !_REENT_ONLY */
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