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 #if defined (HAVE_SYS_PARAM_H)
71 #include <sys/param.h>
73 #include <netinet/in.h>
74 #include <arpa/inet.h>
85 # define INADDR_NONE 0xffffffff
88 /* these are compatibility routines, not needed on recent BSD releases */
91 /* Not used, not needed. */
93 * Ascii internet address interpretation routine.
94 * The value returned is in network order.
98 register const char *cp;
102 if (inet_aton(cp, &val))
104 return (INADDR_NONE);
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.
117 register const char *cp;
118 struct in_addr *addr;
120 register u_bits32_t val;
121 register int base, n;
122 register unsigned char c;
124 register u_int *pp = parts;
129 * Collect number up to ``.''.
130 * Values are specified as for C:
131 * 0x=hex, 0=octal, isdigit=decimal.
136 if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' &&
137 c != '5' && c != '6' && c != '7' && c != '8' && c != '9')
143 if (c == 'x' || c == 'X')
144 base = 16, c = *++cp;
149 if (isascii(c) && isdigit(c)) {
150 val = (val * base) + (c - '0');
152 } else if (base == 16 && isascii(c) && isxdigit(c)) {
154 (c + 10 - (islower(c) ? 'a' : 'A'));
163 * a.b.c (with c treated as 16 bits)
164 * a.b (with b treated as 24 bits)
174 * Check for trailing characters.
176 if (c != '\0' && (!isascii(c) || !isspace(c)))
179 * Concoct the address according to
180 * the number of parts specified.
186 return (0); /* initial nondigit */
188 case 1: /* a -- 32 bits */
191 case 2: /* a.b -- 8.24 bits */
194 val |= parts[0] << 24;
197 case 3: /* a.b.c -- 8.8.16 bits */
200 val |= (parts[0] << 24) | (parts[1] << 16);
203 case 4: /* a.b.c.d -- 8.8.8.8 bits */
206 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
210 addr->s_addr = htonl(val);
214 #endif /* !HAVE_INET_ATON */