lib/sh/inet_aton.c

   1 /* inet_aton - convert string to numeric IP address */
   2
   3 /* Snagged from GNU C library, version 2.0.3. */
   4
   5 /*
   6  * ++Copyright++ 1983, 1990, 1993
   7  * -
   8  * Copyright (c) 1983, 1990, 1993
   9  *    The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  * -
  39  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  40  *
  41  * Permission to use, copy, modify, and distribute this software for any
  42  * purpose with or without fee is hereby granted, provided that the above
  43  * copyright notice and this permission notice appear in all copies, and that
  44  * the name of Digital Equipment Corporation not be used in advertising or
  45  * publicity pertaining to distribution of the document or software without
  46  * specific, written prior permission.
  47  *
  48  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  49  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  50  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  51  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  52  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  53  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  54  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  55  * SOFTWARE.
  56  * -
  57  * --Copyright--
  58  */
  59
  60 #if defined(LIBC_SCCS) && !defined(lint)
  61 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  62 static char rcsid[] = "$Id: inet_addr.c,v 1.5 1996/08/14 03:48:37 drepper Exp $";
  63 #endif /* LIBC_SCCS and not lint */
  64
  65 #include <config.h>
  66
  67 #if !defined (HAVE_INET_ATON) && defined (HAVE_NETWORK) && defined (HAVE_NETINET_IN_H) && defined (HAVE_ARPA_INET_H)
  68
  69 #include <sys/types.h>
  70 #if defined (HAVE_SYS_PARAM_H)
  71 #include <sys/param.h>
  72 #endif
  73 #include <netinet/in.h>
  74 #include <arpa/inet.h>
  75
  76 #ifdef HAVE_UNISTD_H
  77 #  include <unistd.h>
  78 #endif
  79
  80 #include <bushansi.h>
  81 #include <ctype.h>
  82 #include <stdc.h>
  83
  84 #ifndef INADDR_NONE
  85 #  define INADDR_NONE 0xffffffff
  86 #endif
  87
  88 /* these are compatibility routines, not needed on recent BSD releases */
  89
  90 #if 0
  91 /* Not used, not needed. */
  92 /*
  93  * Ascii internet address interpretation routine.
  94  * The value returned is in network order.
  95  */
  96 u_long
  97 inet_addr(cp)
  98         register const char *cp;
  99 {
 100         struct in_addr val;
 101
 102         if (inet_aton(cp, &val))
 103                 return (val.s_addr);
 104         return (INADDR_NONE);
 105 }
 106 #endif
 107
 108 /*
 109  * Check whether "cp" is a valid ascii representation
 110  * of an Internet address and convert to a binary address.
 111  * Returns 1 if the address is valid, 0 if not.
 112  * This replaces inet_addr, the return value from which
 113  * cannot distinguish between failure and a local broadcast address.
 114  */
 115 int
 116 inet_aton(cp, addr)
 117         register const char *cp;
 118         struct in_addr *addr;
 119 {
 120         register u_bits32_t val;
 121         register int base, n;
 122         register unsigned char c;
 123         u_int parts[4];
 124         register u_int *pp = parts;
 125
 126         c = *cp;
 127         for (;;) {
 128                 /*
 129                  * Collect number up to ``.''.
 130                  * Values are specified as for C:
 131                  * 0x=hex, 0=octal, isdigit=decimal.
 132                  */
 133 #if 0
 134                 if (!isdigit(c))
 135 #else
 136                 if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' &&
 137                     c != '5' && c != '6' && c != '7' && c != '8' && c != '9')
 138 #endif
 139                         return (0);
 140                 val = 0; base = 10;
 141                 if (c == '0') {
 142                         c = *++cp;
 143                         if (c == 'x' || c == 'X')
 144                                 base = 16, c = *++cp;
 145                         else
 146                                 base = 8;
 147                 }
 148                 for (;;) {
 149                         if (isascii(c) && isdigit(c)) {
 150                                 val = (val * base) + (c - '0');
 151                                 c = *++cp;
 152                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 153                                 val = (val << 4) |
 154                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 155                                 c = *++cp;
 156                         } else
 157                                 break;
 158                 }
 159                 if (c == '.') {
 160                         /*
 161                          * Internet format:
 162                          *      a.b.c.d
 163                          *      a.b.c   (with c treated as 16 bits)
 164                          *      a.b     (with b treated as 24 bits)
 165                          */
 166                         if (pp >= parts + 3)
 167                                 return (0);
 168                         *pp++ = val;
 169                         c = *++cp;
 170                 } else
 171                         break;
 172         }
 173         /*
 174          * Check for trailing characters.
 175          */
 176         if (c != '\0' && (!isascii(c) || !isspace(c)))
 177                 return (0);
 178         /*
 179          * Concoct the address according to
 180          * the number of parts specified.
 181          */
 182         n = pp - parts + 1;
 183         switch (n) {
 184
 185         case 0:
 186                 return (0);             /* initial nondigit */
 187
 188         case 1:                         /* a -- 32 bits */
 189                 break;
 190
 191         case 2:                         /* a.b -- 8.24 bits */
 192                 if (val > 0xffffff)
 193                         return (0);
 194                 val |= parts[0] << 24;
 195                 break;
 196
 197         case 3:                         /* a.b.c -- 8.8.16 bits */
 198                 if (val > 0xffff)
 199                         return (0);
 200                 val |= (parts[0] << 24) | (parts[1] << 16);
 201                 break;
 202
 203         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 204                 if (val > 0xff)
 205                         return (0);
 206                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 207                 break;
 208         }
 209         if (addr)
 210                 addr->s_addr = htonl(val);
 211         return (1);
 212 }
 213
 214 #endif /* !HAVE_INET_ATON */