From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- stdlib/wcstombs.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 stdlib/wcstombs.c (limited to 'stdlib/wcstombs.c') diff --git a/stdlib/wcstombs.c b/stdlib/wcstombs.c new file mode 100644 index 0000000000..acaf15a94e --- /dev/null +++ b/stdlib/wcstombs.c @@ -0,0 +1,77 @@ +/* Copyright (C) 1991, 1992 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include +#include +#include +#include +#include +#include + + +/* Convert the `wchar_t' string in PWCS to a multibyte character string + in S, writing no more than N characters. Return the number of bytes + written, or (size_t) -1 if an invalid `wchar_t' was found. */ +size_t +DEFUN(wcstombs, (s, pwcs, n), + register char *s AND register CONST wchar_t *pwcs AND register size_t n) +{ + register CONST mb_char *mb; + register int shift = 0; + + register size_t written = 0; + register wchar_t w; + + while ((w = *pwcs++) != (wchar_t) '\0') + { + if (isascii (w)) + { + /* A normal character. */ + *s++ = (unsigned char) w; + --n; + ++written; + } + else + { + mb = &_ctype_info->mbchar->mb_chars[w + shift]; + if (mb->string == NULL || mb->len == 0) + { + written = (size_t) -1; + break; + } + else if (mb->len > n) + break; + else + { + memcpy ((PTR) s, (CONST PTR) mb->string, mb->len); + s += mb->len; + n -= mb->len; + written += mb->len; + shift += mb->shift; + } + } + } + + /* Terminate the string if it has space. */ + if (n > 0) + *s = '\0'; + + /* Return the number of characters written (or maybe an error). */ + return written; +} -- cgit 1.4.1