/* Copyright (C) 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gnu.org>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <errno.h> #include <wchar.h> #ifndef EILSEQ #define EILSEQ EINVAL #endif static const wchar_t encoding_mask[] = { ~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff }; static const unsigned char encoding_byte[] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc }; /* We don't need the state really because we don't have shift states to maintain between calls to this function. */ static mbstate_t internal; /* This is a non-standard function but it is very useful in the implementation of stdio because we have to deal with unterminated buffers. At most NWC wide character will be converted. */ size_t __wmemrtombs (dst, src, nwc, len, ps) char *dst; const wchar_t **src; size_t nwc; size_t len; mbstate_t *ps; { size_t written = 0; const wchar_t *run = *src; if (ps == NULL) ps = &internal; if (dst == NULL) /* The LEN parameter has to be ignored if we don't actually write anything. */ len = ~0; while (written < len && nwc-- > 0) { wchar_t wc; /* Store position of first unprocessed word. */ *src = run; wc = *run++; if (wc < 0 || wc > 0x7fffffff) { /* This is no correct ISO 10646 character. */ __set_errno (EILSEQ); return (size_t) -1; } if (wc < 0x80) { /* It's an one byte sequence. */ if (dst != NULL) *dst++ = (char) wc; ++written; } else { size_t step; for (step = 2; step < 6; ++step) if ((wc & encoding_mask[step - 2]) == 0) break; if (written + step >= len) /* Too long. */ break; if (dst != NULL) { size_t cnt = step; dst[0] = encoding_byte[cnt - 2]; --cnt; do { dst[cnt] = 0x80 | (wc & 0x3f); wc >>= 6; } while (--cnt > 0); dst[0] |= wc; dst += step; } written += step; } } /* Store position of first unprocessed word. */ *src = run; return written; } weak_alias (__wmemrtombs, wmemrtombs)