0,0 → 1,81 |
/* |
FUNCTION |
<<mblen>>---minimal multibyte length function |
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INDEX |
mblen |
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ANSI_SYNOPSIS |
#include <stdlib.h> |
int mblen(const char *<[s]>, size_t <[n]>); |
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TRAD_SYNOPSIS |
#include <stdlib.h> |
int mblen(<[s]>, <[n]>) |
const char *<[s]>; |
size_t <[n]>; |
|
DESCRIPTION |
When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming |
implementation of <<mblen>>. In this case, the |
only ``multi-byte character sequences'' recognized are single bytes, |
and thus <<1>> is returned unless <[s]> is the null pointer or |
has a length of 0 or is the empty string. |
|
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. |
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RETURNS |
This implementation of <<mblen>> returns <<0>> if |
<[s]> is <<NULL>> or the empty string; it returns <<1>> if not _MB_CAPABLE or |
the character is a single-byte character; it returns <<-1>> |
if the multi-byte character is invalid; otherwise it returns |
the number of bytes in the multibyte character. |
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PORTABILITY |
<<mblen>> is required in the ANSI C standard. However, the precise |
effects vary with the locale. |
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<<mblen>> 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> |
#include "local.h" |
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int |
_DEFUN (mblen, (s, n), |
const char *s _AND |
size_t n) |
{ |
#ifdef _MB_CAPABLE |
int retval = 0; |
struct _reent *reent = _REENT; |
mbstate_t *state; |
|
_REENT_CHECK_MISC(reent); |
state = &(_REENT_MBLEN_STATE(reent)); |
retval = __mbtowc (reent, NULL, s, n, __locale_charset (), state); |
if (retval < 0) |
{ |
state->__count = 0; |
return -1; |
} |
else |
return retval; |
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#else /* not _MB_CAPABLE */ |
if (s == NULL || *s == '\0') |
return 0; |
if (n == 0) |
return -1; |
return 1; |
#endif /* not _MB_CAPABLE */ |
} |
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#endif /* !_REENT_ONLY */ |