X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fwchar%2Fwcsncpy.c;fp=functions%2Fwchar%2Fwcsncpy.c;h=6d0e4d284a748d5884eb45701af4188c7e81901d;hb=507d3eccbf4c74e4694165f9e00ab79d894b4f66;hp=0000000000000000000000000000000000000000;hpb=0150bb9ffe66236b6a47c5800d8beef669d5c047;p=pdclib.old

diff --git a/functions/wchar/wcsncpy.c b/functions/wchar/wcsncpy.c
new file mode 100644
index 0000000..6d0e4d2
--- /dev/null
+++ b/functions/wchar/wcsncpy.c
@@ -0,0 +1,43 @@
+/* wchar_t * wcsncpy( wchar_t restrict *, const wchar_t restrict * , size_t );
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <wchar.h>
+
+#ifndef REGTEST
+
+wchar_t *wcsncpy( wchar_t * _PDCLIB_restrict s1, 
+                  const wchar_t * _PDCLIB_restrict s2,
+                  size_t n )
+{
+    wchar_t * rc = s1;
+    while ( ( n > 0 ) && ( *s1++ = *s2++ ) )
+    {
+        /* Cannot do "n--" in the conditional as size_t is unsigned and we have
+           to check it again for >0 in the next loop below, so we must not risk
+           underflow.
+        */
+        --n;
+    }
+    /* Checking against 1 as we missed the last --n in the loop above. */
+    while ( n-- > 1 )
+    {
+        *s1++ = '\0';
+    }
+    return rc;
+}
+
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    return TEST_RESULTS;
+}
+
+#endif