Refactor code into utils, mfapi and mfshell

- utils is the low level library used by the others
 - mfapi uses utils and implements the api and some wrappers
 - mfshell uses mfapi and utils to provide a shell

mfshell/commands/host.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
+ *               2014 Johannes Schauer <j.schauer@email.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2, as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../mfshell.h"
+#include "../commands.h"
+
+static char*
+_get_host_from_user(void);
+
+int
+mfshell_cmd_host(mfshell_t *mfshell, int argc, char **argv)
+{
+    char    *alt_host = NULL;
+    char    *host;
+
+    switch (argc) {
+        case 1:
+            alt_host = _get_host_from_user();
+            host = alt_host;
+            break;
+        case 2:
+            host = argv[1];
+            break;
+        default:
+            fprintf(stderr, "Invalid number of arguments\n");
+            return -1;
+    }
+
+    if(mfshell->server != NULL)
+    {
+        // do nothing if the server is exactly the same
+        if(strcmp(mfshell->server,host) == 0)
+        {
+            if(alt_host != NULL) free(alt_host);
+            return 0;
+        }
+
+        if(mfshell->server != NULL)
+        {
+            free(mfshell->server);
+            mfshell->server = NULL;
+        }
+    }
+
+    mfshell->server = strdup(host);
+
+    mfconn_destroy(mfshell->mfconn);
+
+    if(alt_host != NULL) free(alt_host);
+
+    return 0;
+}
+
+char*
+_get_host_from_user(void)
+{
+    size_t  len = 0;
+    char    *host = NULL;
+
+    printf("host: [www.mediafire.com] ");
+    getline(&host,&len,stdin);
+    if (host[strlen(host)-1] == '\n')
+        host[strlen(host)-1] = '\0';
+
+    if(host == NULL)
+        return strdup("www.mediafire.com");
+
+    if(strlen(host) < 2)
+    {
+        free(host);
+        return strdup("www.mediafire.com");
+    }
+
+    return host;
+}