newlib-cygwin/newlib/libc/stdlib/wcstombs.c

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/*
FUNCTION
<<wcstombs>>---minimal wide char string to multibyte string converter
INDEX
wcstombs
SYNOPSIS
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#include <stdlib.h>
size_t wcstombs(char *restrict <[s]>, const wchar_t *restrict <[pwc]>, size_t <[n]>);
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DESCRIPTION
When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
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implementation of <<wcstombs>>. In this case,
all wide-characters are expected to represent single bytes and so
are converted simply by casting to char.
When _MB_CAPABLE is defined, this routine calls <<_wcstombs_r>> to perform
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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 <<wcstombs>> returns <<0>> if
<[s]> is <<NULL>> or is the empty string;
it returns <<-1>> if _MB_CAPABLE and one of the
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wide-char characters does not represent a valid multi-byte character;
otherwise it returns the minimum of: <<n>> or the
number of bytes that are transferred to <<s>>, not including the
nul terminator.
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 if
<<n>> > 0.
PORTABILITY
<<wcstombs>> is required in the ANSI C standard. However, the precise
effects vary with the locale.
<<wcstombs>> requires no supporting OS subroutines.
*/
#ifndef _REENT_ONLY
#include <newlib.h>
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#include <stdlib.h>
* libc/include/langinfo.h: New file. * libc/include/wchar.h: Likewise. * libc/include/sys/syslimits.h: Likewise. * libc/locale/fix_grouping.c: Likewise. * libc/locale/ldpart.c: Likewise. * libc/locale/ldpart.h: Likewise. * libc/locale/lmessages.c: Likewise. * libc/locale/lmessages.h: Likewise. * libc/locale/lmonetary.c: Likewise. * libc/locale/lmonetary.h: Likewise. * libc/locale/lnumeric.c: Likewise. * libc/locale/lnumeric.h: Likewise. * libc/locale/nl_langinfo.3: Likewise. * libc/locale/nl_langinfo.c: Likewise. * libc/locale/timelocal.c: Likewise. * libc/locale/timelocal.h: Likewise. * libc/stdlib/btowc.c: Likewise. * libc/stdlib/mbrlen.c: Likewise. * libc/stdlib/mbrtowc.c: Likewise. * libc/stdlib/mbsinit.c: Likewise. * libc/stdlib/mbsrtowcs.c: Likewise. * libc/stdlib/wcrtomb.c: Likewise. * libc/stdlib/wcsrtombs.c: Likewise. * libc/stdlib/wctob.c: Likewise. * libc/sys/linux/prof-freq.c: Likewise. * libc/sys/linux/profile.c: Likewise. * libc/sys/linux/machine/i386/dl-procinfo.c: Likewise. * libc/sys/linux/machine/i386/dl-procinfo.h: Likewise. * libc/include/stdlib.h: Change re-entrant functions to take mbstate_t pointers. * libc/include/sys/_types.h: Define _mbstate_t. * libc/include/sys/config.h (MB_LEN_MAX): New macro. * libc/include/sys/errno.h (EILSEQ): New error code. * libc/include/sys/reent.h: Include wchar.h. Change reentrant structure to use mbstate_t. * libc/locale/Makefile.am (LIB_SOURCES): Add new files. * libc/machine/powerpc/vfprintf.c: Use mbstate_t. * libc/machine/powerpc/vfscanf.c: Likewise. * libc/stdio/getdelim.c: Reallocate buffer only when necessary. * libc/stdio/vfprintf.c: Likewise. * libc/stdio/vfscanf.c: Likewise. * libc/stdlib/Makefile.am (LIB_SOURCES): Add new files. * libc/stdlib/mblen.c: Use mbstate_t. * libc/stdlib/mblen_r.c: Likewise. * libc/stdlib/mbstowcs.c: Likewise. * libc/stdlib/mbstowcs_r.c: Likewise. * libc/stdlib/mbtowc.c: Likewise. * libc/stdlib/mbtowc_r.c: Likewise. * libc/stdlib/wcstombs.c: Likewise. * libc/stdlib/wcstombs_r.c: Likewise. * libc/stdlib/wctomb_r.c: Likewise. * libc/sys/linux/Makefile.am (LIB_SOURCES): Add prof-freq.c and profile.c. * libc/sys/linux/machine/i386/Makefile.am (LIB_SOURCES): Add dl-procinfo.c. * libc/sys/linux/sys/errno.h (EILSEQ): New error code. * libc/sys/linux/sys/types.h (off_t): Define type. * testsuite/newlib.locale/UTF-8.c: Change locale name from UTF-8 to C-UTF-8. * testsuite/newlib.locale/UTF-8.exp: Likewise.
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#include <wchar.h>
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size_t
wcstombs (char *__restrict s,
const wchar_t *__restrict pwcs,
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size_t n)
{
#ifdef _MB_CAPABLE
mbstate_t state;
state.__count = 0;
return _wcstombs_r (_REENT, s, pwcs, n, &state);
#else /* not _MB_CAPABLE */
int count = 0;
if (n != 0) {
do {
if ((*s++ = (char) *pwcs++) == 0)
break;
count++;
} while (--n != 0);
}
return count;
#endif /* not _MB_CAPABLE */
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}
#endif /* !_REENT_ONLY */