New functions by Michael Walle for resizing registers on the fly

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1851 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -15,6 +15,12 @@
   * include/urjtag/bitops.h: New generic bit operations by Michael Walle.
   * include/urjtag/Makefile.am (pkginclude_HEADERS): Add bitops.h
 
+  * include/urjtag/data_register.h, src/part/data_register.c
+    (urj_part_data_register_realloc): New func by Michael Walle for resizing
+    registers on the fly.
+  * include/urjtag/tap_register.h, src/tap/register.c
+    (urj_tap_register_realloc): Likewise.
+
 2010-08-30  Mike Frysinger  <vapier@gentoo.org>
 
   * configure.ac: Clean up libusb detection to prefer 1.0 over 0.1, and accept

urjtag/include/urjtag/data_register.h

@@ -40,6 +40,13 @@ struct URJ_DATA_REGISTER
 urj_data_register_t *urj_part_data_register_alloc (const char *name, int len);
 void urj_part_data_register_free (urj_data_register_t *dr);
 
+/**
+ * change the length of a data_register while preserving its contents
+ *
+ * @return URJ_STATUS_OK on success; URJ_STATUS_FAIL on error
+ */
+int urj_part_data_register_realloc (urj_data_register_t *dr, int len);
+
 /**
  * allocate a data register and initialize the relevant <code>part</code> parts
  *

urjtag/include/urjtag/tap_register.h

@@ -36,6 +36,7 @@ struct URJ_TAP_REGISTER
 };
 
 urj_tap_register_t *urj_tap_register_alloc (int len);
+urj_tap_register_t *urj_tap_register_realloc (urj_tap_register_t *tr, int new_len);
 urj_tap_register_t *urj_tap_register_duplicate (const urj_tap_register_t *tr);
 void urj_tap_register_free (urj_tap_register_t *tr);
 urj_tap_register_t *urj_tap_register_fill (urj_tap_register_t *tr, int val);

urjtag/src/part/data_register.c

@@ -133,3 +133,14 @@ urj_part_data_register_define (urj_part_t *part, const char *name, int len)
 
     return URJ_STATUS_OK;
 }
+
+int
+urj_part_data_register_realloc (urj_data_register_t *dr, int new_len)
+{
+    if (urj_tap_register_realloc (dr->in, new_len) == NULL)
+        return URJ_STATUS_FAIL;
+    if (urj_tap_register_realloc (dr->out, new_len) == NULL)
+        return URJ_STATUS_FAIL;
+
+    return URJ_STATUS_OK;
+}

urjtag/src/tap/register.c

@@ -78,6 +78,35 @@ urj_tap_register_alloc (int len)
     return tr;
 }
 
+urj_tap_register_t *
+urj_tap_register_realloc (urj_tap_register_t *tr, int new_len)
+{
+    if (!tr)
+        return urj_tap_register_alloc (new_len);
+
+    if (new_len < 1)
+    {
+        urj_error_set (URJ_ERROR_INVALID, "new_len < 1");
+        return NULL;
+    }
+
+    tr->data = realloc (tr->data, new_len);
+
+    if (!tr->data)
+    {
+        urj_error_set (URJ_ERROR_OUT_OF_MEMORY, "realloc(%d) fails",
+                       new_len);
+        return NULL;
+    }
+
+    if (tr->len < new_len)
+        memset (tr->data + tr->len, 0, (new_len - tr->len));
+
+    tr->len = new_len;
+
+    return tr;
+}
+
 urj_tap_register_t *
 urj_tap_register_duplicate (const urj_tap_register_t *tr)
 {