xnu-2422.1.72.tar.gz

[apple/xnu.git] / libkern / net / inet_aton.c

diff --git a/libkern/net/inet_aton.c b/libkern/net/inet_aton.c
new file mode 100644 (file)
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+++ b/libkern/net/inet_aton.c
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 2001 Charles Mott <cm@linktel.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/param.h>
+#include <sys/systm.h>
+
+#include <netinet/in.h>
+
+/* XXX ctype.h is missing, see libkern/stdio/scanf.c */
+#if 1
+static inline int
+isspace(char c)
+{
+        return (c == ' ' || c == '\t' || c == '\n' || c == '\12');
+}
+#endif
+
+int
+inet_aton(const char *cp, struct in_addr *addr)
+{
+       u_long parts[4];
+       in_addr_t val;
+       const char *c;
+       char *endptr;
+       int gotend, n;
+
+       c = (const char *)cp;
+       n = 0;
+
+       /*
+        * Run through the string, grabbing numbers until
+        * the end of the string, or some error
+        */
+       gotend = 0;
+       while (!gotend) {
+               unsigned long l;
+
+               l = strtoul(c, &endptr, 0);
+
+               if (l == ULONG_MAX || (l == 0 && endptr == c))
+                       return (0);
+
+               val = (in_addr_t)l;
+
+               /*
+                * If the whole string is invalid, endptr will equal
+                * c.. this way we can make sure someone hasn't
+                * gone '.12' or something which would get past
+                * the next check.
+                */
+               if (endptr == c)
+                       return (0);
+               parts[n] = val;
+               c = endptr;
+
+               /* Check the next character past the previous number's end */
+               switch (*c) {
+               case '.' :
+
+                       /* Make sure we only do 3 dots .. */
+                       if (n == 3)     /* Whoops. Quit. */
+                               return (0);
+                       n++;
+                       c++;
+                       break;
+
+               case '\0':
+                       gotend = 1;
+                       break;
+
+               default:
+                       if (isspace((unsigned char)*c)) {
+                               gotend = 1;
+                               break;
+                       } else {
+
+                               /* Invalid character, then fail. */
+                               return (0);
+                       }
+               }
+
+       }
+
+       /* Concoct the address according to the number of parts specified. */
+       switch (n) {
+       case 0:                         /* a -- 32 bits */
+
+               /*
+                * Nothing is necessary here.  Overflow checking was
+                * already done in strtoul().
+                */
+               break;
+       case 1:                         /* a.b -- 8.24 bits */
+               if (val > 0xffffff || parts[0] > 0xff)
+                       return (0);
+               val |= parts[0] << 24;
+               break;
+
+       case 2:                         /* a.b.c -- 8.8.16 bits */
+               if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
+                       return (0);
+               val |= (parts[0] << 24) | (parts[1] << 16);
+               break;
+
+       case 3:                         /* a.b.c.d -- 8.8.8.8 bits */
+               if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
+                   parts[2] > 0xff)
+                       return (0);
+               val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+               break;
+       }
+
+       if (addr != NULL)
+               addr->s_addr = htonl(val);
+       return (1);
+}