1 /* inet_aton - convert string to numeric IP address */
3 /* Snagged from GNU C library, version 2.0.3. */
6 * ++Copyright++ 1983, 1990, 1993
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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 */
67 #if !defined (HAVE_INET_ATON) && defined (HAVE_NETWORK) && defined (HAVE_NETINET_IN_H) && defined (HAVE_ARPA_INET_H)
69 #include <sys/types.h>
70 #include <sys/param.h>
71 #include <netinet/in.h>
72 #include <arpa/inet.h>
83 # define INADDR_NONE 0xffffffff
86 /* these are compatibility routines, not needed on recent BSD releases */
89 /* Not used, not needed. */
91 * Ascii internet address interpretation routine.
92 * The value returned is in network order.
96 register const char *cp;
100 if (inet_aton(cp, &val))
102 return (INADDR_NONE);
107 * Check whether "cp" is a valid ascii representation
108 * of an Internet address and convert to a binary address.
109 * Returns 1 if the address is valid, 0 if not.
110 * This replaces inet_addr, the return value from which
111 * cannot distinguish between failure and a local broadcast address.
115 register const char *cp;
116 struct in_addr *addr;
118 register u_bits32_t val;
119 register int base, n;
120 register unsigned char c;
122 register u_int *pp = parts;
127 * Collect number up to ``.''.
128 * Values are specified as for C:
129 * 0x=hex, 0=octal, isdigit=decimal.
134 if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' &&
135 c != '5' && c != '6' && c != '7' && c != '8' && c != '9')
141 if (c == 'x' || c == 'X')
142 base = 16, c = *++cp;
147 if (isascii(c) && isdigit(c)) {
148 val = (val * base) + (c - '0');
150 } else if (base == 16 && isascii(c) && isxdigit(c)) {
152 (c + 10 - (islower(c) ? 'a' : 'A'));
161 * a.b.c (with c treated as 16 bits)
162 * a.b (with b treated as 24 bits)
172 * Check for trailing characters.
174 if (c != '\0' && (!isascii(c) || !isspace(c)))
177 * Concoct the address according to
178 * the number of parts specified.
184 return (0); /* initial nondigit */
186 case 1: /* a -- 32 bits */
189 case 2: /* a.b -- 8.24 bits */
192 val |= parts[0] << 24;
195 case 3: /* a.b.c -- 8.8.16 bits */
198 val |= (parts[0] << 24) | (parts[1] << 16);
201 case 4: /* a.b.c.d -- 8.8.8.8 bits */
204 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
208 addr->s_addr = htonl(val);
212 #endif /* !HAVE_INET_ATON */