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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /stdlib/wcstombs.c
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initial import
Diffstat (limited to 'stdlib/wcstombs.c')
-rw-r--r--stdlib/wcstombs.c77
1 files changed, 77 insertions, 0 deletions
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 <ansidecl.h>
+#include <localeinfo.h>
+#include <ctype.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/* 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;
+}