2.11BSD#431 - /usr/src/lib/libc/inet/inet_network.c

   1: /*
   2:  * Copyright (c) 1983 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #if defined(LIBC_SCCS) && !defined(lint)
   8: static char sccsid[] = "@(#)inet_network.c	5.2 (Berkeley) 3/9/86";
   9: #endif LIBC_SCCS and not lint
  10: 
  11: #include <sys/types.h>
  12: #include <netinet/in.h>
  13: #include <ctype.h>
  14: 
  15: /*
  16:  * Internet network address interpretation routine.
  17:  * The library routines call this routine to interpret
  18:  * network numbers.
  19:  */
  20: u_long
  21: inet_network(cp)
  22:     register char *cp;
  23: {
  24:     register u_long val, base, n;
  25:     register char c;
  26:     u_long parts[4], *pp = parts;
  27:     register int i;
  28: 
  29: again:
  30:     val = 0; base = 10;
  31:     if (*cp == '0')
  32:         base = 8, cp++;
  33:     if (*cp == 'x' || *cp == 'X')
  34:         base = 16, cp++;
  35:     while (c = *cp) {
  36:         if (isdigit(c)) {
  37:             val = (val * base) + (c - '0');
  38:             cp++;
  39:             continue;
  40:         }
  41:         if (base == 16 && isxdigit(c)) {
  42:             val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  43:             cp++;
  44:             continue;
  45:         }
  46:         break;
  47:     }
  48:     if (*cp == '.') {
  49:         if (pp >= parts + 4)
  50:             return (-1);
  51:         *pp++ = val, cp++;
  52:         goto again;
  53:     }
  54:     if (*cp && !isspace(*cp))
  55:         return (-1);
  56:     *pp++ = val;
  57:     n = pp - parts;
  58:     if (n > 4)
  59:         return (-1);
  60:     for (val = 0, i = 0; i < n; i++) {
  61:         val <<= 8;
  62:         val |= parts[i] & 0xff;
  63:     }
  64:     return (val);
  65: }

Defined functions

Defined variables