date and time created 82/10/07 17:08:21 by sam

SCCS-vsn: lib/libc/net/inet_network.c 4.1

diff --git a/usr/src/lib/libc/net/inet_network.c b/usr/src/lib/libc/net/inet_network.c
new file mode 100644 (file)
index 0000000..6969922
--- /dev/null
+++ b/usr/src/lib/libc/net/inet_network.c
@@ -0,0 +1,55 @@
+/*     @(#)inet_network.c      4.1     %G%     */
+
+#include <sys/types.h>
+#include <ctype.h>
+
+/*
+ * Internet network address interpretation routine.
+ * The library routines call this routine to interpret
+ * network numbers.
+ */
+u_long
+inet_network(cp)
+       register char *cp;
+{
+       register u_long val, base, n;
+       register char c;
+       u_long parts[4], *pp = parts;
+
+again:
+       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 == '.') {
+               if (pp >= parts + 4)
+                       return (-1);
+               *pp++ = val, cp++;
+               goto again;
+       }
+       if (*cp && !isspace(*cp))
+               return (-1);
+       *pp++ = val;
+       n = pp - parts;
+       if (n > 4)
+               return (-1);
+       for (val = 0, i = 0; i < n; i++) {
+               val <<= 8;
+               val |= parts[i] & 0xff;
+       }
+       return (val);
+}