lib/dnet_pton.c

   1 #include <errno.h>
   2 #include <sys/types.h>
   3 #include <netinet/in.h>
   4
   5 #include "utils.h"
   6
   7 static __inline__ u_int16_t dn_htons(u_int16_t addr)
   8 {
   9         union {
  10                 u_int8_t byte[2];
  11                 u_int16_t word;
  12         } u;
  13
  14         u.word = addr;
  15         return ((u_int16_t)u.byte[0]) | (((u_int16_t)u.byte[1]) << 8);
  16 }
  17
  18
  19 static int dnet_num(const char *src, u_int16_t * dst)
  20 {
  21         int rv = 0;
  22         int tmp;
  23         *dst = 0;
  24
  25         while ((tmp = *src++) != 0) {
  26                 tmp -= '0';
  27                 if ((tmp < 0) || (tmp > 9))
  28                         return rv;
  29
  30                 rv++;
  31                 (*dst) *= 10;
  32                 (*dst) += tmp;
  33         }
  34
  35         return rv;
  36 }
  37
  38 static int dnet_pton1(const char *src, struct dn_naddr *dna)
  39 {
  40         u_int16_t area = 0;
  41         u_int16_t node = 0;
  42         int pos;
  43
  44         pos = dnet_num(src, &area);
  45         if ((pos == 0) || (area > 63) || (*(src + pos) != '.'))
  46                 return 0;
  47         pos = dnet_num(src + pos + 1, &node);
  48         if ((pos == 0) || (node > 1023))
  49                 return 0;
  50         dna->a_len = 2;
  51         *(u_int16_t *)dna->a_addr = dn_htons((area << 10) | node);
  52
  53         return 1;
  54 }
  55
  56 int dnet_pton(int af, const char *src, void *addr)
  57 {
  58         int err;
  59
  60         switch (af) {
  61         case AF_DECnet:
  62                 errno = 0;
  63                 err = dnet_pton1(src, (struct dn_naddr *)addr);
  64                 break;
  65         default:
  66                 errno = EAFNOSUPPORT;
  67                 err = -1;
  68         }
  69
  70         return err;
  71 }