1 /* $OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $ */
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57 * @(#)inet_addr.c 8.1 (Berkeley) 6/17/93
58 * $From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $
59 * $OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $
64 #if !defined(HAVE_INET_ATON)
66 #include <sys/types.h>
67 #include <sys/param.h>
68 #include <netinet/in.h>
69 #include <arpa/inet.h>
74 * Ascii internet address interpretation routine.
75 * The value returned is in network order.
79 register const char *cp;
83 if (inet_aton(cp, &val))
90 * Check whether "cp" is a valid ascii representation
91 * of an Internet address and convert to a binary address.
92 * Returns 1 if the address is valid, 0 if not.
93 * This replaces inet_addr, the return value from which
94 * cannot distinguish between failure and a local broadcast address.
97 inet_aton(const char *cp, struct in_addr *addr)
99 register u_int32_t val;
100 register int base, n;
102 unsigned int parts[4];
103 register unsigned int *pp = parts;
108 * Collect number up to ``.''.
109 * Values are specified as for C:
110 * 0x=hex, 0=octal, isdigit=decimal.
117 if (c == 'x' || c == 'X')
118 base = 16, c = *++cp;
123 if (isascii(c) && isdigit(c)) {
124 val = (val * base) + (c - '0');
126 } else if (base == 16 && isascii(c) && isxdigit(c)) {
128 (c + 10 - (islower(c) ? 'a' : 'A'));
137 * a.b.c (with c treated as 16 bits)
138 * a.b (with b treated as 24 bits)
148 * Check for trailing characters.
150 if (c != '\0' && (!isascii(c) || !isspace(c)))
153 * Concoct the address according to
154 * the number of parts specified.
160 return (0); /* initial nondigit */
162 case 1: /* a -- 32 bits */
165 case 2: /* a.b -- 8.24 bits */
166 if ((val > 0xffffff) || (parts[0] > 0xff))
168 val |= parts[0] << 24;
171 case 3: /* a.b.c -- 8.8.16 bits */
172 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
174 val |= (parts[0] << 24) | (parts[1] << 16);
177 case 4: /* a.b.c.d -- 8.8.8.8 bits */
178 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
180 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
184 addr->s_addr = htonl(val);
188 #endif /* !defined(HAVE_INET_ATON) */