diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6db14ee..486ec42 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,9 +4,11 @@ project(mediafire-tools)
 
 
 add_library(mfapi SHARED mfapi/mfconn.c mfapi/file.c mfapi/folder.c mfapi/apicalls/file_get_info.c mfapi/apicalls/user_get_info.c mfapi/apicalls/file_get_links.c mfapi/apicalls/user_session.c mfapi/apicalls/folder_get_info.c mfapi/apicalls/folder_create.c mfapi/apicalls/folder_get_content.c)
+set_target_properties(mfapi PROPERTIES COMPILE_FLAGS "-Wall -Wextra -Werror")
 
 add_library(mfutils SHARED utils/http.c  utils/json.c  utils/strings.c  utils/stringv.c)
+set_target_properties(mfutils PROPERTIES COMPILE_FLAGS "-Wall -Wextra -Werror")
 
 add_executable(mfshell mfshell/main.c mfshell/mfshell.c mfshell/commands/auth.c mfshell/commands/chdir.c mfshell/commands/debug.c mfshell/commands/file.c mfshell/commands/get.c mfshell/commands/help.c mfshell/commands/host.c mfshell/commands/lcd.c mfshell/commands/links.c mfshell/commands/list.c mfshell/commands/lpwd.c mfshell/commands/mkdir.c mfshell/commands/pwd.c mfshell/commands/whoami.c)
-
+set_target_properties(mfshell PROPERTIES COMPILE_FLAGS "-Wall -Wextra -Werror")
 target_link_libraries(mfshell curl ssl crypto jansson mfapi mfutils)
diff --git a/mfapi/apicalls/file_get_info.c b/mfapi/apicalls/file_get_info.c
index 54398a9..6ce46cc 100644
--- a/mfapi/apicalls/file_get_info.c
+++ b/mfapi/apicalls/file_get_info.c
@@ -70,7 +70,6 @@ _decode_file_get_info(http_t *conn, void *data)
     json_t          *quickkey;
     json_t          *file_hash;
     json_t          *file_name;
-    json_t          *file_folder;
     int             retval = 0;
     file_t         *file;
 
diff --git a/mfapi/apicalls/folder_get_content.c b/mfapi/apicalls/folder_get_content.c
index 34140fb..d7a2fca 100644
--- a/mfapi/apicalls/folder_get_content.c
+++ b/mfapi/apicalls/folder_get_content.c
@@ -43,7 +43,6 @@ mfconn_api_folder_get_content(mfconn_t *mfconn, int mode, folder_t *folder_curr)
 {
     char        *api_call;
     int         retval;
-    char        *rx_buffer;
     char        *content_type;
 
     if(mfconn == NULL) return -1;
@@ -96,6 +95,9 @@ _decode_folder_get_content_folders(http_t *conn, void *user_ptr)
     int             array_sz;
     int             i = 0;
 
+    if (user_ptr != NULL)
+        return -1;
+
     root = http_parse_buf_json(conn, 0, &error);
 
     /*json_t *result = json_object_by_path(root, "response/action");
@@ -154,6 +156,9 @@ _decode_folder_get_content_files(http_t *conn, void *user_ptr)
     int             array_sz;
     int             i = 0;
 
+    if (user_ptr != NULL)
+        return -1;
+
     root = http_parse_buf_json(conn, 0, &error);
 
     node = json_object_by_path(root,"response/folder_content");
diff --git a/mfapi/apicalls/user_get_info.c b/mfapi/apicalls/user_get_info.c
index c3cd9e3..e998787 100644
--- a/mfapi/apicalls/user_get_info.c
+++ b/mfapi/apicalls/user_get_info.c
@@ -63,6 +63,9 @@ _decode_user_get_info(http_t *conn, void *data)
     json_t          *first_name;
     json_t          *last_name;
 
+    if (data != NULL)
+        return -1;
+
     root = http_parse_buf_json(conn, 0, &error);
 
     node = json_object_by_path(root,"response/user_info");
diff --git a/mfapi/mfconn.c b/mfapi/mfconn.c
index 0f77e06..727b6ae 100644
--- a/mfapi/mfconn.c
+++ b/mfapi/mfconn.c
@@ -87,7 +87,7 @@ mfconn_create_user_signature(mfconn_t *mfconn, char *username, char *password,
 {
     char            *signature_raw;
     unsigned char   signature_enc[20];      // sha1 is 160 bits
-    unsigned char   signature_hex[41];
+    char            signature_hex[41];
     int             i;
 
     if(mfconn == NULL) return NULL;
@@ -114,7 +114,7 @@ mfconn_create_call_signature(mfconn_t *mfconn,char *url,char *args)
 {
     char            *signature_raw;
     unsigned char   signature_enc[16];      // md5 is 128 bits
-    unsigned char   signature_hex[33];
+    char            signature_hex[33];
     char            *api;
     int             i;
 
@@ -156,7 +156,6 @@ mfconn_create_signed_get(mfconn_t *mfconn,int ssl,char *api,char *fmt,...)
     char        *call_hash;
     char        *session_token;
     int         bytes_to_alloc;
-    int         api_request_len;
     int         api_args_len;
     int         api_len;
     va_list     ap;
diff --git a/mfshell/commands/auth.c b/mfshell/commands/auth.c
index 5469f37..1c5f0fe 100644
--- a/mfshell/commands/auth.c
+++ b/mfshell/commands/auth.c
@@ -36,7 +36,6 @@ _get_passwd_from_user(void);
 int
 mfshell_cmd_auth(mfshell_t *mfshell, int argc, char **argv)
 {
-    int retval;
     char *username;
     char *password;
 
diff --git a/mfshell/commands/debug.c b/mfshell/commands/debug.c
index b417258..ef7eacc 100644
--- a/mfshell/commands/debug.c
+++ b/mfshell/commands/debug.c
@@ -30,6 +30,7 @@
 int
 mfshell_cmd_debug(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
     if (argc != 1) {
         fprintf(stderr, "Invalid number of arguments\n");
         return -1;
diff --git a/mfshell/commands/file.c b/mfshell/commands/file.c
index c52cbbe..8851ac3 100644
--- a/mfshell/commands/file.c
+++ b/mfshell/commands/file.c
@@ -52,6 +52,9 @@ mfshell_cmd_file(mfshell_t *mfshell, int argc, char **argv)
     file = file_alloc();
 
     retval = mfconn_api_file_get_info(mfshell->mfconn,file,(char*)quickkey);
+    if (retval != 0) {
+        fprintf(stderr, "api call unsuccessful\n");
+    }
     mfconn_update_secret_key(mfshell->mfconn);
 
     quickkey = file_get_key(file);
diff --git a/mfshell/commands/get.c b/mfshell/commands/get.c
index 12abf32..0a716a9 100644
--- a/mfshell/commands/get.c
+++ b/mfshell/commands/get.c
@@ -80,9 +80,9 @@ mfshell_cmd_get(mfshell_t *mfshell, int argc, char **argv)
         getcwd(mfshell->local_working_dir,PATH_MAX);
     }
 
-    retval = file_download_direct(file, mfshell->local_working_dir);
+    bytes_read = file_download_direct(file, mfshell->local_working_dir);
 
-    if(retval != -1)
+    if(bytes_read != -1)
         printf("\r   Downloaded %zd bytes OK!\n\r",bytes_read);
     else
         printf("\r\n   Download FAILED!\n\r");
diff --git a/mfshell/commands/help.c b/mfshell/commands/help.c
index 4158481..6709cd9 100644
--- a/mfshell/commands/help.c
+++ b/mfshell/commands/help.c
@@ -28,6 +28,12 @@
 int
 mfshell_cmd_help(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
+    if (argc != 1) {
+        fprintf(stderr, "Invalid number of arguments\n");
+        return -1;
+    }
+
     printf(
         "  arguments:\n\r"
         "           <optional>\n\r"
@@ -35,8 +41,8 @@ mfshell_cmd_help(mfshell_t *mfshell, int argc, char **argv)
 
     printf("\n\r");
 
-    int column1_width = 0;
-    int column2_width = 0;
+    unsigned int column1_width = 0;
+    unsigned int column2_width = 0;
 
     _cmd_t* curr_cmd;
     for (curr_cmd = mfshell->commands; curr_cmd->name != NULL; curr_cmd++) {
diff --git a/mfshell/commands/links.c b/mfshell/commands/links.c
index e3a9964..e1af7d6 100644
--- a/mfshell/commands/links.c
+++ b/mfshell/commands/links.c
@@ -53,6 +53,9 @@ mfshell_cmd_links(mfshell_t *mfshell, int argc, char **argv)
     file = file_alloc();
 
     retval = mfconn_api_file_get_links(mfshell->mfconn,file,(char*)quickkey);
+    if (retval != 0) {
+        fprintf(stderr, "api call unsuccessful\n");
+    }
     mfconn_update_secret_key(mfshell->mfconn);
 
     share_link = file_get_share_link(file);
diff --git a/mfshell/commands/list.c b/mfshell/commands/list.c
index 6933e5a..fbeb590 100644
--- a/mfshell/commands/list.c
+++ b/mfshell/commands/list.c
@@ -29,6 +29,7 @@
 int
 mfshell_cmd_list(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
     int         retval;
     const char  *folder_curr;
 
diff --git a/mfshell/commands/lpwd.c b/mfshell/commands/lpwd.c
index 9a3a832..bd8bff5 100644
--- a/mfshell/commands/lpwd.c
+++ b/mfshell/commands/lpwd.c
@@ -29,6 +29,7 @@
 int
 mfshell_cmd_lpwd(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
     if(mfshell == NULL) return -1;
 
     if (argc != 1) {
diff --git a/mfshell/commands/pwd.c b/mfshell/commands/pwd.c
index 162ae8f..bc13109 100644
--- a/mfshell/commands/pwd.c
+++ b/mfshell/commands/pwd.c
@@ -29,6 +29,7 @@
 int
 mfshell_cmd_pwd(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
     const char  *folder_name;
     char        *folder_name_tmp = NULL;
 
diff --git a/mfshell/commands/whoami.c b/mfshell/commands/whoami.c
index d01399c..2f5565e 100644
--- a/mfshell/commands/whoami.c
+++ b/mfshell/commands/whoami.c
@@ -29,6 +29,7 @@
 int
 mfshell_cmd_whoami(mfshell_t *mfshell, int argc, char **argv)
 {
+    (void)argv;
     int retval;
 
     if (argc != 1) {
diff --git a/mfshell/main.c b/mfshell/main.c
index 2850484..07a1bf4 100644
--- a/mfshell/main.c
+++ b/mfshell/main.c
@@ -35,7 +35,7 @@ mfshell_run(mfshell_t *mfshell);
 static void
 mfshell_parse_commands(mfshell_t *mfshell, char *command);
 
-void print_help(mfshell_t *mfshell, char *cmd)
+void print_help(char *cmd)
 {
     fprintf(stderr, "A shell to access a MediaFire account.\n");
     fprintf(stderr, "\n");
@@ -62,7 +62,7 @@ void print_help(mfshell_t *mfshell, char *cmd)
     fprintf(stderr, "\n");
 }
 
-void parse_argv(mfshell_t *mfshell, int argc, char **argv, char **username,
+void parse_argv(int argc, char **argv, char **username,
         char **password, char **server, char **command)
 {
     static struct option long_options[] = {
@@ -94,7 +94,7 @@ void parse_argv(mfshell_t *mfshell, int argc, char **argv, char **username,
                 *server = strdup(optarg);
                 break;
             case 'h':
-                print_help(mfshell, argv[0]);
+                print_help(argv[0]);
                 exit(0);
             case 'v':
                 exit(0);
@@ -125,12 +125,10 @@ int main(int argc,char **argv)
     char                *username = NULL;
     char                *password = NULL;
     char                *command = NULL;
-    size_t              len;
-    int                 retval;
 
     SSL_library_init();
 
-    parse_argv(mfshell, argc, argv, &username, &password, &server, &command);
+    parse_argv(argc, argv, &username, &password, &server, &command);
 
     mfshell = mfshell_create(35860,
         "2c6dq0gb2sr8rgsue5a347lzpjnaay46yjazjcjg",server);
@@ -156,6 +154,15 @@ mfshell_parse_commands(mfshell_t *mfshell, char *command)
     while ((next = strsep(&command, ";")) != NULL) {
         // FIXME: handle non-zero return value of wordexp
         ret = wordexp(next, &p, WRDE_SHOWERR | WRDE_UNDEF);
+        if (ret != 0) {
+            switch (ret) {
+                case WRDE_BADCHAR: fprintf(stderr, "wordexp: WRDE_BADCHAR\n"); break;
+                case WRDE_BADVAL: fprintf(stderr, "wordexp: WRDE_BADVAL\n"); break;
+                case WRDE_CMDSUB: fprintf(stderr, "wordexp: WRDE_CMDSUB\n"); break;
+                case WRDE_NOSPACE: fprintf(stderr, "wordexp: WRDE_NOSPACE\n"); break;
+                case WRDE_SYNTAX: fprintf(stderr, "wordexp: WRDE_SYNTAX\n"); break;
+            }
+        }
         if (p.we_wordc < 1) {
             fprintf(stderr, "Need more than zero arguments\n");
             exit(1);
diff --git a/mfshell/mfshell.c b/mfshell/mfshell.c
index 3ccc291..398b579 100644
--- a/mfshell/mfshell.c
+++ b/mfshell/mfshell.c
@@ -101,6 +101,7 @@ mfshell_exec(mfshell_t *mfshell, int argc, char **argv)
             return curr_cmd->handler(mfshell, argc, argv);
         }
     }
+    return -1;
 }
 
 int
@@ -114,6 +115,15 @@ mfshell_exec_shell_command(mfshell_t *mfshell,char *command)
 
     // FIXME: handle non-zero return value of wordexp
     retval = wordexp(command, &p, WRDE_SHOWERR | WRDE_UNDEF);
+    if (retval != 0) {
+        switch (retval) {
+            case WRDE_BADCHAR: fprintf(stderr, "wordexp: WRDE_BADCHAR\n"); break;
+            case WRDE_BADVAL: fprintf(stderr, "wordexp: WRDE_BADVAL\n"); break;
+            case WRDE_CMDSUB: fprintf(stderr, "wordexp: WRDE_CMDSUB\n"); break;
+            case WRDE_NOSPACE: fprintf(stderr, "wordexp: WRDE_NOSPACE\n"); break;
+            case WRDE_SYNTAX: fprintf(stderr, "wordexp: WRDE_SYNTAX\n"); break;
+        }
+    }
 
     if (p.we_wordc < 1)
         return 0;
diff --git a/utils/http.c b/utils/http.c
index 6d3574b..bae78c7 100644
--- a/utils/http.c
+++ b/utils/http.c
@@ -133,15 +133,14 @@ http_get_buf(http_t *conn, const char *url, int (*data_handler)(http_t *conn, vo
 static size_t
 http_read_buf_cb(char *data, size_t size, size_t nmemb, void *user_ptr)
 {
-    http_t *conn;
     size_t data_len;
 
     if (user_ptr == NULL) return 0;
 
-    conn = (http_t*)user_ptr;
     data_len = size*nmemb;
 
     if (data_len > 0) {
+        fwrite(data, size, nmemb, stderr);
         fprintf(stderr, "Not implemented");
         exit(1);
     }
@@ -225,9 +224,11 @@ http_write_file_cb(char *data, size_t size, size_t nmemb, void *user_ptr)
     fwrite(data, size, nmemb, conn->stream);
 
     fprintf(stderr, "\r   %.0f / %.0f", conn->dl_now, conn->dl_len);
+
+    return size*nmemb;
 }
 
-int
+/*int
 http_post_file(http_t *conn, const char *url, const char *post_args, FILE *fd)
 {
-}
+}*/
diff --git a/utils/strings.c b/utils/strings.c
index 5eea852..7e965c3 100644
--- a/utils/strings.c
+++ b/utils/strings.c
@@ -75,7 +75,7 @@ strdup_join(char *string1,char *string2)
 
 
 char*
-strdup_subst(char *string,char *token,char *subst,int max)
+strdup_subst(char *string,char *token,char *subst, unsigned int max)
 {
     size_t      string_len = 0;
     size_t      subst_len = 0;
diff --git a/utils/strings.h b/utils/strings.h
index 1dded1b..850f8d8 100644
--- a/utils/strings.h
+++ b/utils/strings.h
@@ -26,7 +26,7 @@ char*       strdup_printf(char* fmt, ...);
 
 char*       strdup_join(char *string1,char *string2);
 
-char*       strdup_subst(char *string,char *str_old,char *str_new,int max);
+char*       strdup_subst(char *string,char *str_old,char *str_new, unsigned int max);
 
 void        string_chomp(char *string);
 
diff --git a/utils/stringv.c b/utils/stringv.c
index a42eb66..bd8ec84 100644
--- a/utils/stringv.c
+++ b/utils/stringv.c
@@ -133,7 +133,7 @@ stringv_split(char *string,char *token,int limit)
     char    *curr = NULL;
     char    *next = NULL;
     int     count = 0;
-    int     len;
+    unsigned int len;
     size_t  copy_len = 0;
 
     if(string == NULL) return (char**)NULL;