Breaks configfiles! Major refactoring of i3status, see below

We finally switched to libconfuse for a configuration file format
which does not require much work for the programmer nor for the user.
Plus, it avoids the Not-Invented-Here syndrome of yet another config
file format.

Furthermore, as a consequence of providing format strings for every
"module" (ipv6, wireless, …), we directly print the output and thus
we needed to drop support for wmii. This allowed us to get rid of
quite some complexity.

Documentation about the new configuration file and options will
follow. This commit is the beginning of what will be i3status v2.0.

1 files changed, 67 insertions, 0 deletions

diff --git a/src/print_ip_addr.c b/src/print_ip_addr.c
new file mode 100644
index 0000000..6ddd35a
--- /dev/null
+++ b/src/print_ip_addr.c
@@ -0,0 +1,67 @@
+// vim:ts=8:expandtab
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+
+#include "i3status.h"
+
+/*
+ * Return the IP address for the given interface or "no IP" if the
+ * interface is up and running but hasn't got an IP address yet
+ *
+ */
+const char *get_ip_addr(const char *interface) {
+        static char part[512];
+        socklen_t len = sizeof(struct sockaddr_in);
+        memset(part, 0, sizeof(part));
+
+        struct ifaddrs *ifaddr, *addrp;
+
+        getifaddrs(&ifaddr);
+
+        if (ifaddr == NULL) {
+                (void)snprintf(part, sizeof(part), "E: down");
+                return part;
+        }
+
+        addrp = ifaddr;
+
+        /* Skip until we are at the AF_INET address of interface */
+        for (addrp = ifaddr;
+
+             (addrp != NULL &&
+              (strcmp(addrp->ifa_name, interface) != 0 ||
+               addrp->ifa_addr == NULL ||
+               addrp->ifa_addr->sa_family != AF_INET));
+
+             addrp = addrp->ifa_next) {
+                /* Check if the interface is down */
+                if (strcmp(addrp->ifa_name, interface) == 0 &&
+                    (addrp->ifa_flags & IFF_RUNNING) == 0) {
+                        freeifaddrs(ifaddr);
+                        return NULL;
+                }
+        }
+
+        if (addrp == NULL) {
+                freeifaddrs(ifaddr);
+                return "no IP";
+        }
+
+        int ret;
+        if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
+                fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
+                freeifaddrs(ifaddr);
+                return "no IP";
+        }
+
+        freeifaddrs(ifaddr);
+        return part;
+}
+