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67 /*! \file lwinetaton.c
69 #if defined(LIBC_SCCS) && !defined(lint)
70 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
71 static char rcsid[] = "$Id: lwinetaton.c,v 1.16 2007/06/19 23:47:22 tbox Exp $";
72 #endif /* LIBC_SCCS and not lint */
80 #include <lwres/int.h>
81 #include <lwres/net.h>
86 * Check whether "cp" is a valid ascii representation
87 * of an Internet address and convert to a binary address.
88 * Returns 1 if the address is valid, 0 if not.
89 * This replaces inet_addr, the return value from which
90 * cannot distinguish between failure and a local broadcast address.
93 lwres_net_aton(const char *cp, struct in_addr *addr) {
98 lwres_uint8_t parts[4];
99 lwres_uint8_t *pp = parts;
107 * Collect number up to ``.''.
108 * Values are specified as for C:
109 * 0x=hex, 0=octal, isdigit=decimal.
111 if (!isdigit(c & 0xff))
118 if (c == 'x' || c == 'X') {
128 * isascii() is valid for all integer values, and
129 * when it is true, c is known to be in scope
130 * for isdigit(). No cast necessary. Similar
131 * comment applies for later ctype uses.
133 if (isascii(c) && isdigit(c)) {
134 if (base == 8 && (c == '8' || c == '9'))
136 val = (val * base) + (c - '0');
139 } else if (base == 16 && isascii(c) && isxdigit(c)) {
141 (c + 10 - (islower(c) ? 'a' : 'A'));
151 * a.b.c (with c treated as 16 bits)
152 * a.b (with b treated as 24 bits)
154 if (pp >= parts + 3 || val > 0xffU)
156 *pp++ = (lwres_uint8_t)val;
162 * Check for trailing characters.
164 if (c != '\0' && (!isascii(c) || !isspace(c)))
167 * Did we get a valid digit?
172 * Concoct the address according to
173 * the number of parts specified.
177 case 1: /* a -- 32 bits */
180 case 2: /* a.b -- 8.24 bits */
183 val |= parts[0] << 24;
186 case 3: /* a.b.c -- 8.8.16 bits */
189 val |= (parts[0] << 24) | (parts[1] << 16);
192 case 4: /* a.b.c.d -- 8.8.8.8 bits */
195 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
199 addr->s_addr = htonl(val);