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-rw-r--r--wcsmbs/wcsncat.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/wcsmbs/wcsncat.c b/wcsmbs/wcsncat.c
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+++ b/wcsmbs/wcsncat.c
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+/* Copyright (C) 1995 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 <wcstr.h>
+
+
+/* Append no more than N wide-character of SRC onto DEST. */
+wchar_t *
+wcsncat (dest, src, n)
+ wchar_t *dest;
+ const wchar_t *src;
+ size_t n;
+{
+ wchar_t c;
+ wchar_t * const s = dest;
+
+ /* Find the end of DEST. */
+ do
+ c = *dest++;
+ while (c != L'\0');
+
+ /* Make DEST point before next character, so we can increment
+ it while memory is read (wins on pipelined cpus). */
+ dest -= 2;
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+ do
+ {
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ } while (--n4 > 0);
+ n &= 3;
+ }
+
+ while (n > 0)
+ {
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ n--;
+ }
+
+ if (c != L'\0')
+ *++dest = L'\0';
+
+ return s;
+}