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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6607 | serge | 1 | /* |
| 2 | FUNCTION |
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| 3 | < |
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| 4 | |||
| 5 | INDEX |
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| 6 | mblen |
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| 7 | |||
| 8 | ANSI_SYNOPSIS |
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| 9 | #include |
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| 10 | int mblen(const char *<[s]>, size_t <[n]>); |
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| 11 | |||
| 12 | TRAD_SYNOPSIS |
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| 13 | #include |
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| 14 | int mblen(<[s]>, <[n]>) |
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| 15 | const char *<[s]>; |
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| 16 | size_t <[n]>; |
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| 17 | |||
| 18 | DESCRIPTION |
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| 19 | When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming |
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| 20 | implementation of < |
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| 21 | only ``multi-byte character sequences'' recognized are single bytes, |
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| 22 | and thus <<1>> is returned unless <[s]> is the null pointer or |
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| 23 | has a length of 0 or is the empty string. |
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| 24 | |||
| 25 | When _MB_CAPABLE is defined, this routine calls <<_mbtowc_r>> to perform |
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| 26 | the conversion, passing a state variable to allow state dependent |
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| 27 | decoding. The result is based on the locale setting which may |
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| 28 | be restricted to a defined set of locales. |
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| 29 | |||
| 30 | RETURNS |
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| 31 | This implementation of < |
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| 32 | <[s]> is < |
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| 33 | the character is a single-byte character; it returns <<-1>> |
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| 34 | if the multi-byte character is invalid; otherwise it returns |
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| 35 | the number of bytes in the multibyte character. |
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| 36 | |||
| 37 | PORTABILITY |
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| 38 | < |
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| 39 | effects vary with the locale. |
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| 40 | |||
| 41 | < |
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| 42 | */ |
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| 43 | |||
| 44 | #ifndef _REENT_ONLY |
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| 45 | |||
| 46 | #include |
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| 47 | #include |
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| 48 | #include |
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| 49 | #include "local.h" |
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| 50 | |||
| 51 | int |
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| 52 | _DEFUN (mblen, (s, n), |
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| 53 | const char *s _AND |
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| 54 | size_t n) |
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| 55 | { |
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| 56 | #ifdef _MB_CAPABLE |
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| 57 | int retval = 0; |
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| 58 | struct _reent *reent = _REENT; |
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| 59 | mbstate_t *state; |
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| 60 | |||
| 61 | _REENT_CHECK_MISC(reent); |
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| 62 | state = &(_REENT_MBLEN_STATE(reent)); |
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| 63 | retval = __mbtowc (reent, NULL, s, n, __locale_charset (), state); |
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| 64 | if (retval < 0) |
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| 65 | { |
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| 66 | state->__count = 0; |
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| 67 | return -1; |
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| 68 | } |
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| 69 | else |
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| 70 | return retval; |
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| 71 | |||
| 72 | #else /* not _MB_CAPABLE */ |
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| 73 | if (s == NULL || *s == '\0') |
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| 74 | return 0; |
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| 75 | if (n == 0) |
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| 76 | return -1; |
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| 77 | return 1; |
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| 78 | #endif /* not _MB_CAPABLE */ |
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| 79 | } |
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| 80 | |||
| 81 | #endif /* !_REENT_ONLY */ |