1 /* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $ */
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52 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
56 #if !defined(HAVE_INET_ATON)
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <netinet/in.h>
61 #include <arpa/inet.h>
66 * Ascii internet address interpretation routine.
67 * The value returned is in network order.
70 inet_addr(const char *cp)
74 if (inet_aton(cp, &val))
81 * Check whether "cp" is a valid ascii representation
82 * of an Internet address and convert to a binary address.
83 * Returns 1 if the address is valid, 0 if not.
84 * This replaces inet_addr, the return value from which
85 * cannot distinguish between failure and a local broadcast address.
88 inet_aton(const char *cp, struct in_addr *addr)
99 * Collect number up to ``.''.
100 * Values are specified as for C:
101 * 0x=hex, 0=octal, isdigit=decimal.
108 if (c == 'x' || c == 'X')
109 base = 16, c = *++cp;
114 if (isascii(c) && isdigit(c)) {
115 val = (val * base) + (c - '0');
117 } else if (base == 16 && isascii(c) && isxdigit(c)) {
119 (c + 10 - (islower(c) ? 'a' : 'A'));
128 * a.b.c (with c treated as 16 bits)
129 * a.b (with b treated as 24 bits)
139 * Check for trailing characters.
141 if (c != '\0' && (!isascii(c) || !isspace(c)))
144 * Concoct the address according to
145 * the number of parts specified.
151 return (0); /* initial nondigit */
153 case 1: /* a -- 32 bits */
156 case 2: /* a.b -- 8.24 bits */
157 if ((val > 0xffffff) || (parts[0] > 0xff))
159 val |= parts[0] << 24;
162 case 3: /* a.b.c -- 8.8.16 bits */
163 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
165 val |= (parts[0] << 24) | (parts[1] << 16);
168 case 4: /* a.b.c.d -- 8.8.8.8 bits */
169 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
171 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
175 addr->s_addr = htonl(val);
179 #endif /* !defined(HAVE_INET_ATON) */