clang: Fix the alignment warning.

[sliver-openvswitch.git] / lib / nx-match.c

diff --git a/lib/nx-match.c b/lib/nx-match.c
index 8bdd8ec..bdb3a2b 100644 (file)
--- a/lib/nx-match.c
+++ b/lib/nx-match.c
@@ -744,7 +744,7 @@ oxm_put_match(struct ofpbuf *b, const struct match *match)
     match_len = nx_put_raw(b, true, match, cookie, cookie_mask) + sizeof *omh;
     ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
 
-    omh = (struct ofp11_match_header *)((char *)b->data + start_len);
+    omh = ofpbuf_at(b, start_len, sizeof *omh);
     omh->type = htons(OFPMT_OXM);
     omh->length = htons(match_len);
 
@@ -807,9 +807,9 @@ nx_match_to_string(const uint8_t *p, unsigned int match_len)
 }
 
 char *
-oxm_match_to_string(const uint8_t *p, unsigned int match_len)
+oxm_match_to_string(const struct ofpbuf *p, unsigned int match_len)
 {
-    const struct ofp11_match_header *omh = (struct ofp11_match_header *)p;
+    const struct ofp11_match_header *omh = p->data;
     uint16_t match_len_;
     struct ds s;
 
@@ -837,7 +837,8 @@ oxm_match_to_string(const uint8_t *p, unsigned int match_len)
         goto err;
     }
 
-    return nx_match_to_string(p + sizeof *omh, match_len - sizeof *omh);
+    return nx_match_to_string(ofpbuf_at(p, sizeof *omh, 0),
+                              match_len - sizeof *omh);
 
 err:
     return ds_steal_cstr(&s);
@@ -997,57 +998,74 @@ oxm_match_from_string(const char *s, struct ofpbuf *b)
     match_len = nx_match_from_string_raw(s, b) + sizeof *omh;
     ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
 
-    omh = (struct ofp11_match_header *)((char *)b->data + start_len);
+    omh = ofpbuf_at(b, start_len, sizeof *omh);
     omh->type = htons(OFPMT_OXM);
     omh->length = htons(match_len);
 
     return match_len;
 }
 \f
-void
+/* Parses 's' as a "move" action, in the form described in ovs-ofctl(8), into
+ * '*move'.
+ *
+ * Returns NULL if successful, otherwise a malloc()'d string describing the
+ * error.  The caller is responsible for freeing the returned string. */
+char * WARN_UNUSED_RESULT
 nxm_parse_reg_move(struct ofpact_reg_move *move, const char *s)
 {
     const char *full_s = s;
+    char *error;
 
-    s = mf_parse_subfield(&move->src, s);
+    error = mf_parse_subfield__(&move->src, &s);
+    if (error) {
+        return error;
+    }
     if (strncmp(s, "->", 2)) {
-        ovs_fatal(0, "%s: missing `->' following source", full_s);
+        return xasprintf("%s: missing `->' following source", full_s);
     }
     s += 2;
-    s = mf_parse_subfield(&move->dst, s);
-    if (*s != '\0') {
-        ovs_fatal(0, "%s: trailing garbage following destination", full_s);
+    error = mf_parse_subfield(&move->dst, s);
+    if (error) {
+        return error;
     }
 
     if (move->src.n_bits != move->dst.n_bits) {
-        ovs_fatal(0, "%s: source field is %d bits wide but destination is "
-                  "%d bits wide", full_s,
-                  move->src.n_bits, move->dst.n_bits);
+        return xasprintf("%s: source field is %d bits wide but destination is "
+                         "%d bits wide", full_s,
+                         move->src.n_bits, move->dst.n_bits);
     }
+    return NULL;
 }
 
-void
+/* Parses 's' as a "load" action, in the form described in ovs-ofctl(8), into
+ * '*load'.
+ *
+ * Returns NULL if successful, otherwise a malloc()'d string describing the
+ * error.  The caller is responsible for freeing the returned string. */
+char * WARN_UNUSED_RESULT
 nxm_parse_reg_load(struct ofpact_reg_load *load, const char *s)
 {
     const char *full_s = s;
     uint64_t value = strtoull(s, (char **) &s, 0);
+    char *error;
 
     if (strncmp(s, "->", 2)) {
-        ovs_fatal(0, "%s: missing `->' following value", full_s);
+        return xasprintf("%s: missing `->' following value", full_s);
     }
     s += 2;
-    s = mf_parse_subfield(&load->dst, s);
-    if (*s != '\0') {
-        ovs_fatal(0, "%s: trailing garbage following destination", full_s);
+    error = mf_parse_subfield(&load->dst, s);
+    if (error) {
+        return error;
     }
 
     if (load->dst.n_bits < 64 && (value >> load->dst.n_bits) != 0) {
-        ovs_fatal(0, "%s: value %"PRIu64" does not fit into %d bits",
-                  full_s, value, load->dst.n_bits);
+        return xasprintf("%s: value %"PRIu64" does not fit into %d bits",
+                         full_s, value, load->dst.n_bits);
     }
 
     load->subvalue.be64[0] = htonll(0);
     load->subvalue.be64[1] = htonll(value);
+    return NULL;
 }
 \f
 /* nxm_format_reg_move(), nxm_format_reg_load(). */
@@ -1316,13 +1334,27 @@ nxm_reg_load(const struct mf_subfield *dst, uint64_t src_data,
 }
 \f
 /* nxm_parse_stack_action, works for both push() and pop(). */
-void
+
+/* Parses 's' as a "push" or "pop" action, in the form described in
+ * ovs-ofctl(8), into '*stack_action'.
+ *
+ * Returns NULL if successful, otherwise a malloc()'d string describing the
+ * error.  The caller is responsible for freeing the returned string. */
+char * WARN_UNUSED_RESULT
 nxm_parse_stack_action(struct ofpact_stack *stack_action, const char *s)
 {
-    s = mf_parse_subfield(&stack_action->subfield, s);
+    char *error;
+
+    error = mf_parse_subfield__(&stack_action->subfield, &s);
+    if (error) {
+        return error;
+    }
+
     if (*s != '\0') {
-        ovs_fatal(0, "%s: trailing garbage following push or pop", s);
+        return xasprintf("%s: trailing garbage following push or pop", s);
     }
+
+    return NULL;
 }
 
 void