net/util.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "net/util.h"
  26 #include <errno.h>
  27 #include <stdlib.h>
  28
  29 int net_parse_macaddr(uint8_t *macaddr, const char *p)
  30 {
  31     int i;
  32     char *last_char;
  33     long int offset;
  34
  35     errno = 0;
  36     offset = strtol(p, &last_char, 0);
  37     if (errno == 0 && *last_char == '\0' &&
  38         offset >= 0 && offset <= 0xFFFFFF) {
  39         macaddr[3] = (offset & 0xFF0000) >> 16;
  40         macaddr[4] = (offset & 0xFF00) >> 8;
  41         macaddr[5] = offset & 0xFF;
  42         return 0;
  43     }
  44
  45     for (i = 0; i < 6; i++) {
  46         macaddr[i] = strtol(p, (char **)&p, 16);
  47         if (i == 5) {
  48             if (*p != '\0') {
  49                 return -1;
  50             }
  51         } else {
  52             if (*p != ':' && *p != '-') {
  53                 return -1;
  54             }
  55             p++;
  56         }
  57     }
  58
  59     return 0;
  60 }