resolv/nsap_addr.c

   1 #if defined(LIBC_SCCS) && !defined(lint)
   2 static char rcsid[] = "$Id$";
   3 #endif /* LIBC_SCCS and not lint */
   4
   5 #include <sys/param.h>
   6 #include <sys/socket.h>
   7 #include <netinet/in.h>
   8 #include <arpa/nameser.h>
   9 #include <ctype.h>
  10 #include <resolv.h>
  11
  12 #include "../conf/portability.h"
  13
  14 #if !defined(isxdigit)  /* XXX - could be a function */
  15 static int
  16 isxdigit(c)
  17         register int c;
  18 {
  19         return ((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F'));
  20 }
  21 #endif
  22
  23 static char
  24 xtob(c)
  25         register int c;
  26 {
  27         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  28 }
  29
  30 u_int
  31 inet_nsap_addr(ascii, binary, maxlen)
  32         const char *ascii;
  33         u_char *binary;
  34         int maxlen;
  35 {
  36         register u_char c, nib;
  37         u_int len = 0;
  38
  39         while ((c = *ascii++) != '\0' && len < maxlen) {
  40                 if (c == '.' || c == '+' || c == '/')
  41                         continue;
  42                 if (!isascii(c))
  43                         return (0);
  44                 if (islower(c))
  45                         c = toupper(c);
  46                 if (isxdigit(c)) {
  47                         nib = xtob(c);
  48                         if (c = *ascii++) {
  49                                 c = toupper(c);
  50                                 if (isxdigit(c)) {
  51                                         *binary++ = (nib << 4) | xtob(c);
  52                                         len++;
  53                                 } else
  54                                         return (0);
  55                         }
  56                         else
  57                                 return (0);
  58                 }
  59                 else
  60                         return (0);
  61         }
  62         return (len);
  63 }
  64
  65 char *
  66 inet_nsap_ntoa(binlen, binary, ascii)
  67         int binlen;
  68         register const u_char *binary;
  69         register char *ascii;
  70 {
  71         register int nib;
  72         int i;
  73         static char tmpbuf[255*3];
  74         char *start;
  75
  76         if (ascii)
  77                 start = ascii;
  78         else {
  79                 ascii = tmpbuf;
  80                 start = tmpbuf;
  81         }
  82
  83         if (binlen > 255)
  84                 binlen = 255;
  85
  86         for (i = 0; i < binlen; i++) {
  87                 nib = *binary >> 4;
  88                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  89                 nib = *binary++ & 0x0f;
  90                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  91                 if (((i % 2) == 0 && (i + 1) < binlen))
  92                         *ascii++ = '.';
  93         }
  94         *ascii = '\0';
  95         return (start);
  96 }