Added some of <string.h>.

[pdclib] / functions / string / strncpy.c

diff --git a/functions/string/strncpy.c b/functions/string/strncpy.c
new file mode 100644 (file)
index 0000000..614ca13
--- /dev/null
+++ b/functions/string/strncpy.c
@@ -0,0 +1,28 @@
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* strncpy( char *, const char *, 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 <string.h>
+
+char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
+{
+    char * 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.
+        */
+        --n;
+    }
+    while ( n-- )
+    {
+        *s1++ = '\0';
+    }
+    return rc;
+}