0,0 → 1,83 |
/* |
FUNCTION |
<<mbstowcs>>---minimal multibyte string to wide char converter |
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INDEX |
mbstowcs |
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ANSI_SYNOPSIS |
#include <stdlib.h> |
int mbstowcs(wchar_t *restrict <[pwc]>, const char *restrict <[s]>, size_t <[n]>); |
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TRAD_SYNOPSIS |
#include <stdlib.h> |
int mbstowcs(<[pwc]>, <[s]>, <[n]>) |
wchar_t *<[pwc]>; |
const char *<[s]>; |
size_t <[n]>; |
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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. |
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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. |
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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. |
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PORTABILITY |
<<mbstowcs>> is required in the ANSI C standard. However, the precise |
effects vary with the locale. |
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<<mbstowcs>> requires no supporting OS subroutines. |
*/ |
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#ifndef _REENT_ONLY |
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#include <newlib.h> |
#include <stdlib.h> |
#include <wchar.h> |
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size_t |
_DEFUN (mbstowcs, (pwcs, s, n), |
wchar_t *__restrict pwcs _AND |
const char *__restrict s _AND |
size_t n) |
{ |
#ifdef _MB_CAPABLE |
mbstate_t state; |
state.__count = 0; |
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return _mbstowcs_r (_REENT, pwcs, s, n, &state); |
#else /* not _MB_CAPABLE */ |
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int count = 0; |
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if (n != 0) { |
do { |
if ((*pwcs++ = (wchar_t) *s++) == 0) |
break; |
count++; |
} while (--n != 0); |
} |
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return count; |
#endif /* not _MB_CAPABLE */ |
} |
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#endif /* !_REENT_ONLY */ |