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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [stdlib/] [mbtowc.c] - Rev 1775
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/* FUNCTION <<mbtowc>>---minimal multibyte to wide char converter INDEX mbtowc ANSI_SYNOPSIS #include <stdlib.h> int mbtowc(wchar_t *<[pwc]>, const char *<[s]>, size_t <[n]>); TRAD_SYNOPSIS #include <stdlib.h> int mbtowc(<[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 <<mbtowc>>. In this case, only ``multi-byte character sequences'' recognized are single bytes, and they are ``converted'' to themselves. Each call to <<mbtowc>> copies one character from <<*<[s]>>> to <<*<[pwc]>>>, unless <[s]> is a null pointer. The argument n is ignored. When MB_CAPABLE is defined, this routine calls <<_mbtowc_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 <<mbtowc>> returns <<0>> if <[s]> is <<NULL>> or is the empty string; it returns <<1>> if not MB_CAPABLE or the character is a single-byte character; it returns <<-1>> if n is <<0>> or the multi-byte character is invalid; otherwise it returns the number of bytes in the multibyte character. If the return value is -1, no changes are made to the <<pwc>> output string. If the input is the empty string, a wchar_t nul is placed in the output string and 0 is returned. If the input has a length of 0, no changes are made to the <<pwc>> output string. PORTABILITY <<mbtowc>> is required in the ANSI C standard. However, the precise effects vary with the locale. <<mbtowc>> requires no supporting OS subroutines. */ #include <stdlib.h> int _DEFUN (mbtowc, (pwc, s, n), wchar_t *pwc _AND const char *s _AND size_t n) { #ifdef MB_CAPABLE static int state; return _mbtowc_r (_REENT, pwc, s, n, &state); #else /* not MB_CAPABLE */ if (s == NULL) return 0; if (n == 0) return -1; if (pwc) *pwc = (wchar_t) *s; return (*s != '\0'); #endif /* not MB_CAPABLE */ }
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