1 /* $OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $ */
4 * ++Copyright++ 1983, 1990, 1993
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60 #if defined(NO_INET_ATON)
62 #if defined(LIBC_SCCS) && !defined(lint)
64 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
65 static char rcsid[] = "$From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $";
67 static char rcsid[] = "$OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $";
69 #endif /* LIBC_SCCS and not lint */
71 #include <sys/types.h>
72 #include <sys/param.h>
73 #include <netinet/in.h>
74 #include <arpa/inet.h>
79 * Ascii internet address interpretation routine.
80 * The value returned is in network order.
84 register const char *cp;
88 if (inet_aton(cp, &val))
95 * Check whether "cp" is a valid ascii representation
96 * of an Internet address and convert to a binary address.
97 * Returns 1 if the address is valid, 0 if not.
98 * This replaces inet_addr, the return value from which
99 * cannot distinguish between failure and a local broadcast address.
102 inet_aton(const char *cp, struct in_addr *addr)
104 register uint32_t val;
105 register int base, n;
107 unsigned int parts[4];
108 register unsigned int *pp = parts;
113 * Collect number up to ``.''.
114 * Values are specified as for C:
115 * 0x=hex, 0=octal, isdigit=decimal.
122 if (c == 'x' || c == 'X')
123 base = 16, c = *++cp;
128 if (isascii(c) && isdigit(c)) {
129 val = (val * base) + (c - '0');
131 } else if (base == 16 && isascii(c) && isxdigit(c)) {
133 (c + 10 - (islower(c) ? 'a' : 'A'));
142 * a.b.c (with c treated as 16 bits)
143 * a.b (with b treated as 24 bits)
153 * Check for trailing characters.
155 if (c != '\0' && (!isascii(c) || !isspace(c)))
158 * Concoct the address according to
159 * the number of parts specified.
165 return (0); /* initial nondigit */
167 case 1: /* a -- 32 bits */
170 case 2: /* a.b -- 8.24 bits */
171 if ((val > 0xffffff) || (parts[0] > 0xff))
173 val |= parts[0] << 24;
176 case 3: /* a.b.c -- 8.8.16 bits */
177 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
179 val |= (parts[0] << 24) | (parts[1] << 16);
182 case 4: /* a.b.c.d -- 8.8.8.8 bits */
183 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
185 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
189 addr->s_addr = htonl(val);
193 #endif /* defined(NO_INET_ATON) */