152 lines
3.5 KiB
C
152 lines
3.5 KiB
C
/*
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FUNCTION
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<<mbsrtowcs>>, <<mbsnrtowcs>>---convert a character string to a wide-character string
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INDEX
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mbsrtowcs
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INDEX
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_mbsrtowcs_r
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INDEX
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mbsnrtowcs
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INDEX
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_mbsnrtowcs_r
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SYNOPSIS
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#include <wchar.h>
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size_t mbsrtowcs(wchar_t *__restrict <[dst]>,
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const char **__restrict <[src]>,
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size_t <[len]>,
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mbstate_t *__restrict <[ps]>);
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#include <wchar.h>
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size_t _mbsrtowcs_r(struct _reent *<[ptr]>, wchar_t *<[dst]>,
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const char **<[src]>, size_t <[len]>,
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mbstate_t *<[ps]>);
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#include <wchar.h>
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size_t mbsnrtowcs(wchar_t *__ restrict <[dst]>,
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const char **__restrict <[src]>, size_t <[nms]>,
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size_t <[len]>, mbstate_t *__restrict <[ps]>);
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#include <wchar.h>
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size_t _mbsnrtowcs_r(struct _reent *<[ptr]>, wchar_t *<[dst]>,
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const char **<[src]>, size_t <[nms]>,
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size_t <[len]>, mbstate_t *<[ps]>);
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DESCRIPTION
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The <<mbsrtowcs>> function converts a sequence of multibyte characters
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pointed to indirectly by <[src]> into a sequence of corresponding wide
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characters and stores at most <[len]> of them in the wchar_t array pointed
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to by <[dst]>, until it encounters a terminating null character ('\0').
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If <[dst]> is NULL, no characters are stored.
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If <[dst]> is not NULL, the pointer pointed to by <[src]> is updated to point
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to the character after the one that conversion stopped at. If conversion
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stops because a null character is encountered, *<[src]> is set to NULL.
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The mbstate_t argument, <[ps]>, is used to keep track of the shift state. If
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it is NULL, <<mbsrtowcs>> uses an internal, static mbstate_t object, which
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is initialized to the initial conversion state at program startup.
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The <<mbsnrtowcs>> function behaves identically to <<mbsrtowcs>>, except that
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conversion stops after reading at most <[nms]> bytes from the buffer pointed
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to by <[src]>.
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RETURNS
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The <<mbsrtowcs>> and <<mbsnrtowcs>> functions return the number of wide
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characters stored in the array pointed to by <[dst]> if successful, otherwise
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it returns (size_t)-1.
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PORTABILITY
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<<mbsrtowcs>> is defined by the C99 standard.
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<<mbsnrtowcs>> is defined by the POSIX.1-2008 standard.
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*/
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#include <reent.h>
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#include <newlib.h>
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#include <wchar.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#ifdef _REENT_THREAD_LOCAL
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_Thread_local _mbstate_t _tls_mbsrtowcs_state;
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#endif
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size_t
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_mbsnrtowcs_r (struct _reent *r,
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wchar_t *dst,
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const char **src,
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size_t nms,
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size_t len,
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mbstate_t *ps)
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{
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wchar_t *ptr = dst;
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const char *tmp_src;
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size_t max;
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size_t count = 0;
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int bytes;
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#ifdef _MB_CAPABLE
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if (ps == NULL)
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{
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_REENT_CHECK_MISC(r);
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ps = &(_REENT_MBSRTOWCS_STATE(r));
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}
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#endif
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if (dst == NULL)
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{
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/* Ignore original len value and do not alter src pointer if the
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dst pointer is NULL. */
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len = (size_t)-1;
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tmp_src = *src;
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src = &tmp_src;
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}
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max = len;
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while (len > 0)
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{
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bytes = _mbrtowc_r (r, ptr, *src, nms, ps);
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if (bytes > 0)
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{
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*src += bytes;
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nms -= bytes;
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++count;
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ptr = (dst == NULL) ? NULL : ptr + 1;
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--len;
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}
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else if (bytes == -2)
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{
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*src += nms;
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return count;
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}
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else if (bytes == 0)
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{
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*src = NULL;
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return count;
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}
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else
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{
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ps->__count = 0;
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_REENT_ERRNO(r) = EILSEQ;
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return (size_t)-1;
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}
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}
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return (size_t)max;
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}
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#ifndef _REENT_ONLY
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size_t
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mbsnrtowcs (wchar_t *__restrict dst,
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const char **__restrict src,
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size_t nms,
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size_t len,
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mbstate_t *__restrict ps)
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{
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return _mbsnrtowcs_r (_REENT, dst, src, nms, len, ps);
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}
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#endif /* !_REENT_ONLY */
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