BSD 4_1c_2 development

Work on file usr/src/lib/libc/net/inet/inet_addr.c

Synthesized-from: CSRG/cd1/4.1c.2

diff --git a/usr/src/lib/libc/net/inet/inet_addr.c b/usr/src/lib/libc/net/inet/inet_addr.c
new file mode 100644 (file)
index 0000000..98118f0
--- /dev/null
+++ b/usr/src/lib/libc/net/inet/inet_addr.c
@@ -0,0 +1,94 @@
+/*     inet_addr.c     4.5     82/11/14        */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <netinet/in.h>
+
+/*
+ * Internet address interpretation routine.
+ * All the network library routines call this
+ * routine to interpret entries in the data bases
+ * which are expected to be an address.
+ * The value returned is in network order.
+ */
+u_long
+inet_addr(cp)
+       register char *cp;
+{
+       register u_long val, base, n;
+       register char c;
+       u_long parts[4], *pp = parts;
+
+again:
+       /*
+        * Collect number up to ``.''.
+        * Values are specified as for C:
+        * 0x=hex, 0=octal, other=decimal.
+        */
+       val = 0; base = 10;
+       if (*cp == '0')
+               base = 8, cp++;
+       if (*cp == 'x' || *cp == 'X')
+               base = 16, cp++;
+       while (c = *cp) {
+               if (isdigit(c)) {
+                       val = (val * base) + (c - '0');
+                       cp++;
+                       continue;
+               }
+               if (base == 16 && isxdigit(c)) {
+                       val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
+                       cp++;
+                       continue;
+               }
+               break;
+       }
+       if (*cp == '.') {
+               /*
+                * Internet format:
+                *      a.b.c.d
+                *      a.b.c   (with c treated as 16-bits)
+                *      a.b     (with b treated as 24 bits)
+                */
+               if (pp >= parts + 4)
+                       return (-1);
+               *pp++ = val, cp++;
+               goto again;
+       }
+       /*
+        * Check for trailing characters.
+        */
+       if (*cp && !isspace(*cp))
+               return (-1);
+       *pp++ = val;
+       /*
+        * Concoct the address according to
+        * the number of parts specified.
+        */
+       n = pp - parts;
+       switch (n) {
+
+       case 1:                         /* a -- 32 bits */
+               val = parts[0];
+               break;
+
+       case 2:                         /* a.b -- 8.24 bits */
+               val = (parts[0] << 24) | (parts[1] & 0xffffff);
+               break;
+
+       case 3:                         /* a.b.c -- 8.8.16 bits */
+               val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
+                       (parts[2] & 0xffff);
+               break;
+
+       case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
+               val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
+                     ((parts[2] & 0xff) << 8) | (parts[3] & 0xff);
+               break;
+
+       default:
+               return (-1);
+       }
+       val = htonl(val);
+       return (val);
+}