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| author | Christopher Faylor <me@cgf.cx> | 2000-02-17 19:39:52 +0000 |
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| committer | Christopher Faylor <me@cgf.cx> | 2000-02-17 19:39:52 +0000 |
| commit | 8a0efa53e44919bcf5ccb1d3353618a82afdf8bc (patch) | |
| tree | 68c3dbf3f2c6fd5d49777def9914d77b5cd4589d /newlib/libc/stdlib/mbtowc.c | |
| parent | 1fd5e000ace55b323124c7e556a7a864b972a5c4 (diff) | |
| download | newlib-8a0efa53e44919bcf5ccb1d3353618a82afdf8bc.zip newlib-8a0efa53e44919bcf5ccb1d3353618a82afdf8bc.tar.gz newlib-8a0efa53e44919bcf5ccb1d3353618a82afdf8bc.tar.bz2 | |
import newlib-2000-02-17 snapshot
Diffstat (limited to 'newlib/libc/stdlib/mbtowc.c')
| -rw-r--r-- | newlib/libc/stdlib/mbtowc.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/newlib/libc/stdlib/mbtowc.c b/newlib/libc/stdlib/mbtowc.c new file mode 100644 index 0000000..5e34fe3 --- /dev/null +++ b/newlib/libc/stdlib/mbtowc.c @@ -0,0 +1,81 @@ +/* +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 <stdlib.h> + +int +_DEFUN (mbtowc, (pwc, s, n), + wchar_t *pwc _AND + const char *s _AND + size_t n) +{ +#ifdef MB_CAPABLE + static int state; + + return _mbtowc_r (_REENT, pwc, s, n, &state); +#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 */ + + + + |