X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fofpbuf.c;h=91ea36303f9f2d06be06d412f730f3d14eb1a4c4;hb=e05924baf0c757b579eef2b3743130ade4b1a93c;hp=3f18d29d0f83616d6ce06583effc5e94904c9616;hpb=b3907fbc6c74ddad7507d0f7abb1f5a2528cd2be;p=openvswitch

diff --git a/lib/ofpbuf.c b/lib/ofpbuf.c
index 3f18d29d..91ea3630 100644
--- a/lib/ofpbuf.c
+++ b/lib/ofpbuf.c
@@ -40,6 +40,17 @@ ofpbuf_use(struct ofpbuf *b, void *base, size_t allocated)
     b->private_p = NULL;
 }
 
+/* Initializes 'b' as an ofpbuf whose data starts at 'data' and continues for
+ * 'size' bytes.  This is appropriate for an ofpbuf that will be used to
+ * inspect existing data, without moving it around or reallocating it, and
+ * generally without modifying it at all. */
+void
+ofpbuf_use_const(struct ofpbuf *b, const void *data, size_t size)
+{
+    ofpbuf_use(b, (void *) data, size);
+    b->size = size;
+}
+
 /* Initializes 'b' as an empty ofpbuf with an initial capacity of 'size'
  * bytes. */
 void
@@ -231,6 +242,33 @@ ofpbuf_put(struct ofpbuf *b, const void *p, size_t size)
     return dst;
 }
 
+/* Parses as many pairs of hex digits as possible (possibly separated by
+ * spaces) from the beginning of 's', appending bytes for their values to 'b'.
+ * Returns the first character of 's' that is not the first of a pair of hex
+ * digits.  If 'n' is nonnull, stores the number of bytes added to 'b' in
+ * '*n'. */
+char *
+ofpbuf_put_hex(struct ofpbuf *b, const char *s, size_t *n)
+{
+    size_t initial_size = b->size;
+    for (;;) {
+        uint8_t byte;
+        bool ok;
+
+        s += strspn(s, " ");
+        byte = hexits_value(s, 2, &ok);
+        if (!ok) {
+            if (n) {
+                *n = b->size - initial_size;
+            }
+            return (char *) s;
+        }
+
+        ofpbuf_put(b, &byte, 1);
+        s += 2;
+    }
+}
+
 /* Reserves 'size' bytes of headroom so that they can be later allocated with
  * ofpbuf_push_uninit() without reallocating the ofpbuf. */
 void