| 0,0 → 1,95 |
|---|
| /* |
| 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. |
| */ |
| |
| #ifndef _REENT_ONLY |
| |
| #include <newlib.h> |
| #include <stdlib.h> |
| #include <wchar.h> |
| #include "local.h" |
| |
| int |
| _DEFUN (mbtowc, (pwc, s, n), |
| wchar_t *pwc _AND |
| const char *s _AND |
| size_t n) |
| { |
| #ifdef _MB_CAPABLE |
| int retval = 0; |
| mbstate_t *ps; |
| |
| _REENT_CHECK_MISC(_REENT); |
| ps = &(_REENT_MBTOWC_STATE(_REENT)); |
| |
| retval = __mbtowc (_REENT, pwc, s, n, __locale_charset (), ps); |
| |
| if (retval < 0) |
| { |
| ps->__count = 0; |
| return -1; |
| } |
| return retval; |
| #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 */ |
| } |
| |
| #endif /* !_REENT_ONLY */ |
| |
| |
| |
| |