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authorRoland McGrath <roland@gnu.org>1996-02-08 10:00:34 +0000
committerRoland McGrath <roland@gnu.org>1996-02-08 10:00:34 +0000
commita482b5a5959240f5d196b32c4833ac48a03c02c3 (patch)
tree7792121005bdfc6a65efc4ed0e5dd53ae6796a17 /wcsmbs/wcsncpy.c
parent4ca84cff3b3e184164acde81deaad1fe52eabd14 (diff)
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* Makefile (subdirs): Added wcsmbs.cvs/libc-960208
* wcsmbs: New directory of wide char/multibyte char functions from drepper.
Diffstat (limited to 'wcsmbs/wcsncpy.c')
-rw-r--r--wcsmbs/wcsncpy.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/wcsmbs/wcsncpy.c b/wcsmbs/wcsncpy.c
new file mode 100644
index 0000000..740c71e
--- /dev/null
+++ b/wcsmbs/wcsncpy.c
@@ -0,0 +1,85 @@
+/* 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>
+
+
+/* Copy no more than N wide-characters of SRC to DEST. */
+wchar_t *
+wcsncpy (dest, src, n)
+ wchar_t *dest;
+ const wchar_t *src;
+ size_t n;
+{
+ wchar_t c;
+ wchar_t * const s = dest;
+
+ --dest;
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+
+ for (;;)
+ {
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ break;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ break;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ break;
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ break;
+ if (--n4 == 0)
+ goto last_chars;
+ }
+ n = n - (dest - s) - 1;
+ if (n == 0)
+ return s;
+ goto zero_fill;
+ }
+
+ last_chars:
+ n &= 3;
+ if (n == 0)
+ return s;
+
+ do
+ {
+ c = *src++;
+ *++dest = c;
+ if (--n == 0)
+ return s;
+ }
+ while (c != L'\0');
+
+ zero_fill:
+ do
+ *++dest = L'\0';
+ while (--n > 0);
+
+ return s;
+}