m + split wchar/*.c

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/wchar/wcsncpy.c b/src/wchar/wcsncpy.c
new file mode 100644
index 0000000..56f342d
--- /dev/null
+++ b/src/wchar/wcsncpy.c
@@ -0,0 +1,43 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <wchar.h>
+
+
+
+/**
+ * Copy a memory segment to another, non-overlapping, segment,
+ * stop when a NUL wide character is encountered.
+ * 
+ * @param   whither  The destination memory segment.
+ * @param   whence   The source memory segment.
+ * @param   maxlen   The maximum number of wide characters to copy.
+ *                   NOTE that if the resulting string at least this
+ *                   long, no NUL character will be written to `whither'.
+ *                   On the otherhand, if the resultnig string is
+ *                   shorter, `whither` will be filled with NUL characters
+ *                   until this amount of characters have been written.
+ * @return           `whither` is returned.
+ */
+wchar_t* wcsncpy(wchar_t* restrict whither, const wchar_t* restrict whence, size_t maxlen)
+{
+  size_t n = wcsnlen(whence, maxlen);
+  wmemcpy(whither, whence, n);
+  wmemset(whither, 0, maxlen - n);
+  return whither;
+}
+