Added optimized versions of strcpy() and strncpy() for CRIS/CRISv32.

1 files changed, 61 insertions, 0 deletions

diff --git a/libc/string/cris/strncpy.c b/libc/string/cris/strncpy.c
new file mode 100644
index 000000000..93a6608bc
--- /dev/null
+++ b/libc/string/cris/strncpy.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2006-2007 Axis Communications AB
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <string.h>
+
+libc_hidden_proto(memset)
+
+libc_hidden_proto(strncpy)
+char *strncpy(char *dest, const char *src, size_t count)
+{
+  char *ret = dest;
+  unsigned long himagic = 0x80808080L;
+  unsigned long lomagic = 0x01010101L;
+
+  while (count && (unsigned long)src & (sizeof src - 1))
+  {
+    count--;
+    if (!(*dest++ = *src++))
+    {
+      goto finalize;
+    }
+  }
+
+  while (count >= sizeof (unsigned long))
+  {
+    unsigned long value = *(unsigned long*)src;
+    unsigned long magic;
+
+    if ((magic = (value - lomagic) & himagic))
+    {
+      if (magic & ~value)
+      {
+        break;
+      }
+    }
+
+    *(unsigned long*)dest = value;
+    dest += sizeof (unsigned long);
+    src += sizeof (unsigned long);
+    count -= sizeof (unsigned long);
+  }
+
+  while (count)
+  {
+    count--;
+    if (!(*dest++ = *src++))
+      break;
+  }
+
+finalize:
+  if (count)
+  {
+    memset(dest, '\0', count);
+  }
+
+  return ret;
+}
+libc_hidden_def(strncpy)