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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [mblen_r.c] - Rev 207
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/* FUNCTION <<_mblen_r>>---reentrant minimal multibyte length function INDEX _mblen_r ANSI_SYNOPSIS #include <stdlib.h> int _mblen_r(struct _reent *<[r]>, const char *<[s]>, size_t <[n]>, int *<[state]>); TRAD_SYNOPSIS #include <stdlib.h> int _mblen_r(<[r]>, <[s]>, <[n]>, <[state]>) struct _reent *<[r]>; const char *<[s]>; size_t <[n]>; int *<[state]>; DESCRIPTION When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming implementation of <<_mblen_r>>. 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. RETURNS This implementation of <<_mblen_r>> 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. PORTABILITY <<_mblen>> is required in the ANSI C standard. However, the precise effects vary with the locale. <<_mblen_r>> requires no supporting OS subroutines. */ #include <newlib.h> #include <stdlib.h> #include <wchar.h> #include "local.h" int _DEFUN (_mblen_r, (r, s, n, state), struct _reent *r _AND const char *s _AND size_t n _AND mbstate_t *state) { #ifdef _MB_CAPABLE int retval; retval = __mbtowc (r, NULL, s, n, __locale_charset (), state); if (retval < 0) { state->__count = 0; return -1; } return retval; #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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