improve buf_cpy helper

[openocd.git] / src / helper / binarybuffer.c

diff --git a/src/helper/binarybuffer.c b/src/helper/binarybuffer.c
index 865d3a3725b10bda5af219836d73e64b1eb2ce43..e5f9854d44a1fcc966129dd48f2c332deb6005c9 100644 (file)
--- a/src/helper/binarybuffer.c
+++ b/src/helper/binarybuffer.c
@@ -48,21 +48,22 @@ const unsigned char bit_reverse_table256[] =
 };
 
 
-uint8_t* buf_cpy(const uint8_t *from, uint8_t *to, int size)
+void* buf_cpy(const void *from, void *_to, unsigned size)
 {
-       if (from == NULL)
+       if (NULL == from || NULL == _to)
                return NULL;
 
-       for (unsigned i = 0, num_bytes = CEIL(size, 8); i < num_bytes; i++)
-               to[i] = from[i];
+       // copy entire buffer
+       memcpy(_to, from, CEIL(size, 8));
 
        /* mask out bits that don't belong to the buffer */
-       if (size % 8)
+       unsigned trailing_bits = size % 8;
+       if (trailing_bits)
        {
-               to[size / 8] &= (0xff >> (8 - (size % 8)));
+               uint8_t *to = _to;
+               to[size / 8] &= (1 << trailing_bits) - 1;
        }
-
-       return to;
+       return _to;
 }
 
 static bool buf_cmp_masked(uint8_t a, uint8_t b, uint8_t m)