4.3BSD - /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 <ctype.h>
  13: 
  14: /*
  15:  * Internet network address interpretation routine.
  16:  * The library routines call this routine to interpret
  17:  * network numbers.
  18:  */
  19: u_long
  20: inet_network(cp)
  21:     register char *cp;
  22: {
  23:     register u_long val, base, n;
  24:     register char c;
  25:     u_long parts[4], *pp = parts;
  26:     register int i;
  27: 
  28: again:
  29:     val = 0; base = 10;
  30:     if (*cp == '0')
  31:         base = 8, cp++;
  32:     if (*cp == 'x' || *cp == 'X')
  33:         base = 16, cp++;
  34:     while (c = *cp) {
  35:         if (isdigit(c)) {
  36:             val = (val * base) + (c - '0');
  37:             cp++;
  38:             continue;
  39:         }
  40:         if (base == 16 && isxdigit(c)) {
  41:             val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  42:             cp++;
  43:             continue;
  44:         }
  45:         break;
  46:     }
  47:     if (*cp == '.') {
  48:         if (pp >= parts + 4)
  49:             return (-1);
  50:         *pp++ = val, cp++;
  51:         goto again;
  52:     }
  53:     if (*cp && !isspace(*cp))
  54:         return (-1);
  55:     *pp++ = val;
  56:     n = pp - parts;
  57:     if (n > 4)
  58:         return (-1);
  59:     for (val = 0, i = 0; i < n; i++) {
  60:         val <<= 8;
  61:         val |= parts[i] & 0xff;
  62:     }
  63:     return (val);
  64: }

Defined functions

Defined variables