* from Red Hat. I didn't look at their source code, but there
* is no denying that this is a loving reimplementation
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include <sys/socket.h>
-#include <arpa/inet.h>
+//usage:#define ipcalc_trivial_usage
+//usage: "[OPTIONS] ADDRESS[[/]NETMASK] [NETMASK]"
+//usage:#define ipcalc_full_usage "\n\n"
+//usage: "Calculate IP network settings from a IP address\n"
+//usage: IF_FEATURE_IPCALC_LONG_OPTIONS(
+//usage: "\n -b,--broadcast Display calculated broadcast address"
+//usage: "\n -n,--network Display calculated network address"
+//usage: "\n -m,--netmask Display default netmask for IP"
+//usage: IF_FEATURE_IPCALC_FANCY(
+//usage: "\n -p,--prefix Display the prefix for IP/NETMASK"
+//usage: "\n -h,--hostname Display first resolved host name"
+//usage: "\n -s,--silent Don't ever display error messages"
+//usage: )
+//usage: )
+//usage: IF_NOT_FEATURE_IPCALC_LONG_OPTIONS(
+//usage: "\n -b Display calculated broadcast address"
+//usage: "\n -n Display calculated network address"
+//usage: "\n -m Display default netmask for IP"
+//usage: IF_FEATURE_IPCALC_FANCY(
+//usage: "\n -p Display the prefix for IP/NETMASK"
+//usage: "\n -h Display first resolved host name"
+//usage: "\n -s Don't ever display error messages"
+//usage: )
+//usage: )
#include "libbb.h"
+/* After libbb.h, because on some systems it needs other includes */
+#include <arpa/inet.h>
-#define CLASS_A_NETMASK ntohl(0xFF000000)
-#define CLASS_B_NETMASK ntohl(0xFFFF0000)
-#define CLASS_C_NETMASK ntohl(0xFFFFFF00)
+#define CLASS_A_NETMASK ntohl(0xFF000000)
+#define CLASS_B_NETMASK ntohl(0xFFFF0000)
+#define CLASS_C_NETMASK ntohl(0xFFFFFF00)
static unsigned long get_netmask(unsigned long ipaddr)
{
#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
static const char ipcalc_longopts[] ALIGN1 =
- "netmask\0" No_argument "m"
- "broadcast\0" No_argument "b"
- "network\0" No_argument "n"
+ "netmask\0" No_argument "m" // netmask from IP (assuming complete class A, B, or C network)
+ "broadcast\0" No_argument "b" // broadcast from IP [netmask]
+ "network\0" No_argument "n" // network from IP [netmask]
# if ENABLE_FEATURE_IPCALC_FANCY
- "prefix\0" No_argument "p"
- "hostname\0" No_argument "h"
- "silent\0" No_argument "s"
+ "prefix\0" No_argument "p" // prefix from IP[/prefix] [netmask]
+ "hostname\0" No_argument "h" // hostname from IP
+ "silent\0" No_argument "s" // don’t ever display error messages
# endif
;
#endif
#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
applet_long_options = ipcalc_longopts;
#endif
+ opt_complementary = "-1:?2"; /* minimum 1 arg, maximum 2 args */
opt = getopt32(argv, "mbn" IF_FEATURE_IPCALC_FANCY("phs"));
argv += optind;
if (opt & SILENT)
logmode = LOGMODE_NONE; /* suppress error_msg() output */
- if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
- if (!argv[0] || !argv[1] || argv[2])
- bb_show_usage();
- } else {
- if (!argv[0] || argv[1])
+ opt &= ~SILENT;
+ if (!(opt & (BROADCAST | NETWORK | NETPREFIX))) {
+ /* if no options at all or
+ * (no broadcast,network,prefix) and (two args)... */
+ if (!opt || argv[1])
bb_show_usage();
}