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      1 /*
      2  * Copyright (c) 1983, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #if defined(LIBC_SCCS) && !defined(lint)
     36 static char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include "inetprivate.h"
     40 
     41 /*
     42  * Internet network address interpretation routine.
     43  * The library routines call this routine to interpret
     44  * network numbers.
     45  */
     46 u_int32_t
     47 inet_network(const char *cp)
     48 {
     49 	register u_long val, base, n;
     50 	register char c;
     51 	u_long parts[4], *pp = parts;
     52 	register int i;
     53 
     54 again:
     55 	/*
     56 	 * Collect number up to ``.''.
     57 	 * Values are specified as for C:
     58 	 * 0x=hex, 0=octal, other=decimal.
     59 	 */
     60 	val = 0; base = 10;
     61 	/*
     62 	 * The 4.4BSD version of this file also accepts 'x__' as a hexa
     63 	 * number.  I don't think this is correct.  -- Uli
     64 	 */
     65 	if (*cp == '0') {
     66 		if (*++cp == 'x' || *cp == 'X')
     67 			base = 16, cp++;
     68 		else
     69 			base = 8;
     70 	}
     71 	while ((c = *cp)) {
     72 		if (isdigit(c)) {
     73 			val = (val * base) + (c - '0');
     74 			cp++;
     75 			continue;
     76 		}
     77 		if (base == 16 && isxdigit(c)) {
     78 			val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
     79 			cp++;
     80 			continue;
     81 		}
     82 		break;
     83 	}
     84 	if (*cp == '.') {
     85 		if (pp >= parts + 4)
     86 			return (INADDR_NONE);
     87 		*pp++ = val, cp++;
     88 		goto again;
     89 	}
     90 	if (*cp && !isspace(*cp))
     91 		return (INADDR_NONE);
     92 	*pp++ = val;
     93 	n = pp - parts;
     94 	if (n > 4)
     95 		return (INADDR_NONE);
     96 	for (val = 0, i = 0; i < (int)n; i++) {
     97 		val <<= 8;
     98 		val |= parts[i] & 0xff;
     99 	}
    100 	return (val);
    101 }
    102