lib/ovsdb-session.c

   1 /* Copyright (c) 2017 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <config.h>
  17 #include "ovsdb-session.h"
  18 #include <stdbool.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include "svec.h"
  22 #include "util.h"
  23 #include "uuid.h"
  24
  25 static const char *
  26 next_remote(const char *s)
  27 {
  28     for (const char *delimiter = strchr(s, ','); delimiter;
  29          delimiter = strchr(delimiter + 1, ',')) {
  30         const char *p = delimiter + 1;
  31         p += strspn(p, " \t");
  32         size_t n_letters = strspn(p, "abcdefghijklmnopqrstuvwxyz");
  33         if (n_letters && p[n_letters] == ':') {
  34             return delimiter;
  35         }
  36     }
  37     return NULL;
  38 }
  39
  40 /* Parses string 's' into comma-delimited substrings and adds each of them into
  41  * 'remotes'.  If one of the substrings is of the form "cid:<uuid>", fills
  42  * '*cid' with the UUID (and omits it from 'remotes'), otherwise initializes
  43  * '*cid' to UUID_ZERO. */
  44 void
  45 ovsdb_session_parse_remote(const char *s,
  46                            struct svec *remotes, struct uuid *cid)
  47 {
  48     *cid = UUID_ZERO;
  49     for (;;) {
  50         /* Skip white space. */
  51         s += strspn(s, " \t");
  52         if (*s == '\0') {
  53             break;
  54         }
  55
  56         /* Find the start of the next remote  */
  57         const char *delimiter = next_remote(s);
  58         if (!delimiter) {
  59             svec_add(remotes, s);
  60             break;
  61         }
  62         svec_add_nocopy(remotes, xmemdup0(s, delimiter - s));
  63         s = delimiter + 1;
  64     }
  65
  66     size_t i;
  67     for (i = 0; i < remotes->n; i++) {
  68         const char *name = remotes->names[i];
  69         struct uuid uuid;
  70         if (!strncmp(name, "cid:", 4) && uuid_from_string(&uuid, name + 4)) {
  71             *cid = uuid;
  72             svec_del(remotes, name);
  73             break;
  74         }
  75     }
  76 }