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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/mbstowcs.c
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initial import
Diffstat (limited to 'stdlib/mbstowcs.c')
-rw-r--r--stdlib/mbstowcs.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/stdlib/mbstowcs.c b/stdlib/mbstowcs.c
new file mode 100644
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--- /dev/null
+++ b/stdlib/mbstowcs.c
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+/* 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 <ctype.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+
+extern int _mb_shift; /* Defined in mbtowc.c. */
+
+/* Convert the string of multibyte characters in S to `wchar_t's in
+ PWCS, writing no more than N. Return the number written,
+ or (size_t) -1 if an invalid multibyte character is encountered. */
+size_t
+DEFUN(mbstowcs, (pwcs, s, n),
+ register wchar_t *pwcs AND register CONST char *s AND register size_t n)
+{
+ int save_shift;
+ register size_t written = 0;
+
+ /* Save the shift state. */
+ save_shift = _mb_shift;
+ /* Reset the shift state. */
+ _mb_shift = 0;
+
+ while (*s != '\0')
+ {
+ int len;
+ if (isascii (*s))
+ {
+ *pwcs = (wchar_t) *s;
+ len = 1;
+ }
+ else
+ len = mbtowc (pwcs, s, n);
+
+ if (len < 1)
+ {
+ /* Return an error. */
+ written = (size_t) -1;
+ break;
+ }
+ else
+ {
+ /* Multibyte character converted. */
+ ++pwcs;
+ ++written;
+ s += len;
+ n -= len;
+ }
+ }
+
+ /* Terminate the string if it has space. */
+ if (n > 0)
+ *pwcs = (wchar_t) 0;
+
+ /* Restore the old shift state. */
+ _mb_shift = save_shift;
+
+ /* Return how many we wrote (or maybe an error). */
+ return written;
+}