Still working on it...

18 files changed, 576 insertions, 296 deletions

diff --git a/include/relabsd/client_types.h b/include/relabsd/client_types.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/include/relabsd/client_types.h
diff --git a/include/relabsd/config/config_file.h b/include/relabsd/config/config_file.h
index 3aa1a13..f904182 100644
--- a/include/relabsd/config/config_file.h
+++ b/include/relabsd/config/config_file.h
@@ -3,20 +3,12 @@
 
 #include <libevdev/libevdev.h>
 
-#include "axis.h"
-
 /* Maximum length for a axis code. */
 #define RELABSD_CONF_AXIS_CODE_SIZE 2
 
 /* Number of options that can be configured. */
 #define RELABSD_OPTIONS_COUNT 3
 
-enum relabsd_option
-{
-   RELABSD_DIRECT_OPTION,
-   RELABSD_REAL_FUZZ_OPTION,
-   RELABSD_FRAMED_OPTION
-};
 
 struct relabsd_config_axis
 {
diff --git a/include/relabsd/config/parameters.h b/include/relabsd/config/parameters.h
index e69de29..5a12be4 100644
--- a/include/relabsd/config/parameters.h
+++ b/include/relabsd/config/parameters.h
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <relabsd/config/parameters_types.h>
+
+/**** Utility *****************************************************************/
+int relabsd_parameters_parse_execution_mode
+(
+   const int argc,
+   const char * const argv [const restrict static argc],
+   struct relabsd_parameters parameters [const restrict static 1]
+);
+
+int relabsd_parameters_parse_options
+(
+   const int argc,
+   const char * const argv [const restrict static argc],
+   struct relabsd_parameters parameters [const restrict static 1]
+);
+
+int relabsd_parameters_argument_count_for
+(
+   const char option [const restrict static 1],
+   int result [const restrict static 1]
+);
+
+void relabsd_parameters_print_usage (const char exec [const restrict static 1]);
+
+/**** Accessors ***************************************************************/
+void relabsd_parameters_initialize_options
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
+
+int relabsd_parameters_get_run_as_daemon
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
+
+const char * relabsd_parameters_get_communication_node_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
+
+const char * relabsd_parameters_get_device_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
+
+const char * relabsd_parameters_get_physical_device_file_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
+
+enum relabsd_parameters_run_mode relabsd_parameters_get_execution_mode
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+);
diff --git a/include/relabsd/config/parameters_types.h b/include/relabsd/config/parameters_types.h
new file mode 100644
index 0000000..ab07bfa
--- /dev/null
+++ b/include/relabsd/config/parameters_types.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <relabsd/device/axis_types.h>
+
+enum relabsd_parameters_run_mode
+{
+   RELABSD_PARAMETERS_CLIENT_MODE,
+   RELABSD_PARAMETERS_SERVER_MODE,
+   RELABSD_PARAMETERS_COMPATIBILITY_TEST_MODE
+};
+
+struct relabsd_parameters
+{
+   int read_argc;
+   enum relabsd_parameters_run_mode mode;
+   int run_as_daemon;
+   const char * communication_node_name;
+   const char * device_name;
+   const char * physical_device_file_name;
+   const char * configuration_file;
+   struct relabsd_axis axes[RELABSD_AXIS_VALID_AXES_COUNT]
+};
diff --git a/include/relabsd/device/axis.h b/include/relabsd/device/axis.h
index 3829b51..fee8522 100644
--- a/include/relabsd/device/axis.h
+++ b/include/relabsd/device/axis.h
@@ -1,30 +1,6 @@
 #pragma once
 
-/* Number of axes that can be configured. */
-#define RELABSD_AXIS_AXES_COUNT 8
-
-enum relabsd_axis_name
-{
-   RELABSD_X,
-   RELABSD_Y,
-   RELABSD_Z,
-   RELABSD_RX,
-   RELABSD_RY,
-   RELABSD_RZ,
-   RELABSD_WHEEL,
-   RELABSD_MISC,
-   RELABSD_UNKNOWN
-};
-
-struct relabsd_axis
-{
-   int min;
-   int max;
-   int fuzz;
-   int flat;
-   int resolution;
-   int flags;
-};
+#include <relabsd/device/axis_types.h>
 
 /*
  * Gives the relabsd_axis and EV_ABS event code equivalent to an EV_REL event
diff --git a/include/relabsd/device/axis_types.h b/include/relabsd/device/axis_types.h
new file mode 100644
index 0000000..5ae0145
--- /dev/null
+++ b/include/relabsd/device/axis_types.h
@@ -0,0 +1,43 @@
+#pragma once
+
+/* Number of axes that can be configured. */
+#define RELABSD_AXIS_VALID_AXES_COUNT 8
+#define RELABSD_AXIS_FLAGS_COUNT 3
+
+/*
+ * C enumerations are always int, and the standard does specify that it starts
+ * at zero and increases from there, unless otherwise specified in the
+ * declaration.
+ */
+enum relabsd_axis_name
+{
+   RELABSD_X,
+   RELABSD_Y,
+   RELABSD_Z,
+   RELABSD_RX,
+   RELABSD_RY,
+   RELABSD_RZ,
+   RELABSD_WHEEL,
+   RELABSD_MISC,
+   RELABSD_UNKNOWN
+};
+
+enum relabsd_axis_flag
+{
+   RELABSD_DIRECT,
+   RELABSD_REAL_FUZZ,
+   RELABSD_FRAMED
+};
+
+struct relabsd_axis
+{
+   int min;
+   int max;
+   int fuzz;
+   int flat;
+   int resolution;
+
+   int is_enabled;
+   int previous_value;
+   int flags[RELABSD_AXIS_FLAGS_COUNT];
+};
diff --git a/include/relabsd/device/physical_device.h b/include/relabsd/device/physical_device.h
index 6b44802..3e55823 100644
--- a/include/relabsd/device/physical_device.h
+++ b/include/relabsd/device/physical_device.h
@@ -1,13 +1,6 @@
 #pragma once
 
-#include <libevdev/libevdev.h>
-
-struct relabsd_physical_device
-{
-   struct libevdev * libevdev;
-   int file;
-   int timed_out;
-};
+#include <relabsd/device/physical_device_types.h>
 
 /*
  * Returns -1 on (fatal) error,
diff --git a/include/relabsd/device/physical_device_types.h b/include/relabsd/device/physical_device_types.h
new file mode 100644
index 0000000..0c2cec7
--- /dev/null
+++ b/include/relabsd/device/physical_device_types.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <libevdev/libevdev.h>
+
+struct relabsd_physical_device
+{
+   struct libevdev * libevdev;
+   int file;
+   int timed_out;
+};
diff --git a/include/relabsd/device/virtual_device.h b/include/relabsd/device/virtual_device.h
index d398c7f..646422a 100644
--- a/include/relabsd/device/virtual_device.h
+++ b/include/relabsd/device/virtual_device.h
@@ -1,26 +1,6 @@
 #pragma once
 
-#include <libevdev/libevdev.h>
-#include <libevdev/libevdev-uinput.h>
-
-/*
-   LIBEVDEV_UINPUT_OPEN_MANAGED is not defined on my machines.
-   It is not my place to define it, so I'll avoid the issue by defining my own
-   constant.
-*/
-#ifndef LIBEVDEV_UINPUT_OPEN_MANAGED
-   #pragma message "[WARNING] libevdev did not define " \
-      "LIBEVDEV_UINPUT_OPEN_MANAGED, using value '-2' instead."
-   #define RELABSD_UINPUT_OPEN_MANAGED -2
-#else
-   #define RELABSD_UINPUT_OPEN_MANAGED LIBEVDEV_UINPUT_OPEN_MANAGED
-#endif
-
-struct relabsd_device
-{
-   struct libevdev * dev;
-   struct libevdev_uinput * uidev;
-};
+#include <relabsd/device/virtual_device_types.h>
 
 /*
  * - Clones the (real) input device.
diff --git a/include/relabsd/device/virtual_device_types.h b/include/relabsd/device/virtual_device_types.h
new file mode 100644
index 0000000..d20fafe
--- /dev/null
+++ b/include/relabsd/device/virtual_device_types.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <libevdev/libevdev.h>
+#include <libevdev/libevdev-uinput.h>
+
+/*
+   LIBEVDEV_UINPUT_OPEN_MANAGED is not defined on my machines.
+   It is not my place to define it, so I'll avoid the issue by defining my own
+   constant.
+*/
+#ifndef LIBEVDEV_UINPUT_OPEN_MANAGED
+   #pragma message "[WARNING] libevdev did not define " \
+      "LIBEVDEV_UINPUT_OPEN_MANAGED, using value '-2' instead."
+   #define RELABSD_UINPUT_OPEN_MANAGED -2
+#else
+   #define RELABSD_UINPUT_OPEN_MANAGED LIBEVDEV_UINPUT_OPEN_MANAGED
+#endif
+
+struct relabsd_device
+{
+   struct libevdev * dev;
+   struct libevdev_uinput * uidev;
+};
diff --git a/include/relabsd/server_types.h b/include/relabsd/server_types.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/include/relabsd/server_types.h
diff --git a/src/client.c b/src/client.c
index d03a768..b0459af 100644
--- a/src/client.c
+++ b/src/client.c
@@ -20,8 +20,8 @@
 /******************************************************************************/
 static int open_socket
 (
-   FILE * s [const restrict static 1],
-   const char socket_name [const restrict static 1]
+   const char socket_name [const restrict static 1],
+   FILE * s [const restrict static 1]
 )
 {
    const int old_errno = errno;
@@ -113,9 +113,16 @@ static int send_commands
          // TODO: error
       }
 
+      if (relabsd_parameters_argument_count_for(argv[i], &j) < 0)
+      {
+         RELABSD_FATAL("Unknown option '%s'.", argv[i]);
+         relabsd_parameters_print_usage(argv[0]);
+
+         return -1;
+      }
+
       for
       (
-         j = relabsd_parameters_argument_count_for(argv[i]),
          i++;
          ((j > 0) && (i < argc));
          j++, i--
@@ -161,14 +168,22 @@ int relabsd_client
 (
    const int argc,
    const char * argv [const restrict static argc],
-   struct relabsd_parameters params [const restrict static 1]
+   struct relabsd_parameters parameters [const restrict static 1]
 )
 {
    FILE * socket;
 
    RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Started client mode.");
 
-   if (open_socket(&socket, relabsd_parameters_get_node(params)) < 0)
+   if
+   (
+      open_socket
+      (
+         relabsd_parameters_get_communication_node_name(parameters),
+         &socket
+      )
+      < 0
+   )
    {
       return -1;
    }
diff --git a/src/config/config_file.c b/src/config/config_file.c
index ad060a5..2e5ef0c 100644
--- a/src/config/config_file.c
+++ b/src/config/config_file.c
@@ -1,3 +1,4 @@
+/**** POSIX *******************************************************************/
 #include <errno.h>
 #include <string.h>
 #include <stdio.h>
@@ -6,38 +7,27 @@
 
 #include <sys/time.h>
 
-#include "error.h"
-#include "pervasive.h"
-#include "axis.h"
-#include "config.h"
+/**** RELABSD *****************************************************************/
+#include <relabsd/debug.h>
+
+#include <relabsd/config/config_file.h>
 
 #ifndef RELABSD_OPTION_MAX_SIZE
    #define RELABSD_OPTION_MAX_SIZE 64
 #endif
-/*
- * "errno is never set to zero by any system call or library function."
- * This file makes use of this, by setting it to zero and checking if
- * it was modified after calling an function (I'm guessing this is common
- * practice, but I think it's worth explaining).
- * Following the principle of least astonishment, if a function sets errno to
- * zero, it will not return before setting it back either to its previous
- * value or to a arbitrary nonzero value.
- */
 
+/******************************************************************************/
+/**** LOCAL FUNCTIONS *********************************************************/
+/******************************************************************************/
 /*
  * Returns -1 on (fatal) error,
  *          0 on EOF,
  *          1 on newline.
  */
-static int reach_next_line_or_eof (FILE * const f)
+static int reach_next_line_or_eof (FILE f [const restrict static 1])
 {
-   int prev_errno;
    char c;
 
-   prev_errno = errno;
-
-   errno = 0;
-
    c = (char) getc(f);
 
    while ((c != '\n') && c != EOF)
@@ -45,21 +35,22 @@ static int reach_next_line_or_eof (FILE * const f)
       c = (char) getc(f);
    }
 
-   if (errno != 0)
+   if (ferror(f))
    {
-      RELABSD_FATAL
+      /*
+       * The 'ferror' function's manual specifically states that it does not
+       * sets errno. There is no mention of errno in the 'getc' function's
+       * either, so I am assuming that errno cannot be used to indicate the
+       * error.
+       */
+      RELABSD_S_FATAL
       (
-         "[CONFIG] Error while attempting to reach EOF or next line: %s.",
-         strerror(errno)
+         "[CONFIG] Error while attempting to reach EOF or next line: %s."
       );
 
-      errno = prev_errno;
-
       return -1;
    }
 
-   errno = prev_errno;
-
    if (c == EOF)
    {
       return 0;
@@ -643,6 +634,7 @@ static int parse_options
 
    return 0;
 }
+
 int relabsd_config_parse
 (
    struct relabsd_config * const conf,
@@ -681,106 +673,6 @@ int relabsd_config_parse
    return 0;
 }
 
-static int direct_filter
-(
-   struct relabsd_config_axis * const axis,
-   int * const value
-)
-{
-   if (abs(*value - axis->previous_value) <= axis->fuzz)
-   {
-      if (axis->option[RELABSD_REAL_FUZZ_OPTION])
-      {
-         axis->previous_value = *value;
-      }
-
-      return -1;
-   }
-
-   if (*value < axis->min)
-   {
-      *value = axis->min;
-   }
-   else if (*value > axis->max)
-   {
-      *value = axis->max;
-   }
-   else if (abs(*value) <= axis->flat)
-   {
-      *value = 0;
-   }
-
-   if (*value == axis->previous_value)
-   {
-      return -1;
-   }
-
-   axis->previous_value = *value;
-
-   return 1;
-}
-
-static int rel_to_abs_filter
-(
-   struct relabsd_config_axis * const axis,
-   int * const value
-)
-{
-   long int guard;
-
-   guard = (((long int) axis->previous_value) + ((long int) *value));
-
-   if (guard < ((long int) INT_MIN))
-   {
-      guard = ((long int) INT_MIN);
-   }
-   else if (guard > ((long int) INT_MAX))
-   {
-      guard = ((long int) INT_MAX);
-   }
-
-   *value = (int) guard;
-
-   if (axis->option[RELABSD_FRAMED_OPTION])
-   {
-      if (*value < axis->min)
-      {
-         *value = axis->min;
-      }
-      else if (*value > axis->max)
-      {
-         *value = axis->max;
-      }
-
-      if (*value == axis->previous_value)
-      {
-         return 0;
-      }
-
-      axis->previous_value = *value;
-
-      return 1;
-   }
-   else
-   {
-      if (*value == axis->previous_value)
-      {
-         return 0;
-      }
-
-      axis->previous_value = *value;
-
-      if ((*value < axis->min) || (*value > axis->max))
-      {
-         return 0;
-      }
-      else
-      {
-         return 1;
-      }
-   }
-}
-
 int relabsd_config_filter
 (
    struct relabsd_config * const conf,
@@ -805,6 +697,9 @@ int relabsd_config_filter
    }
 }
 
+/******************************************************************************/
+/**** EXPORTED FUNCTIONS ******************************************************/
+/******************************************************************************/
 void relabsd_config_get_absinfo
 (
    const struct relabsd_config * const conf,
diff --git a/src/config/parameters.c b/src/config/parameters/parameters.c
index 5e79fa2..c8db4fa 100644
--- a/src/config/parameters.c
+++ b/src/config/parameters/parameters.c
@@ -14,50 +14,6 @@
 /******************************************************************************/
 /**** LOCAL FUNCTIONS *********************************************************/
 /******************************************************************************/
-static void print_usage (const char exec [const restrict static 1])
-{
-   printf
-   (
-      "USAGE: %s <MODE> [<OPTION>+]\n\n"
-
-      "<MODE>:\n"
-      "\t[-? | --compatible] <physical_device_file>:\n"
-         "\t\tDevice compatibility test.\n\n"
-
-      "\t[-c | --client] <server_file>:\n"
-         "\t\tSends the commands to a given server instance.\n\n"
-
-      "\t[-s | --server] <server_file> <physical_device_file>:\n"
-         "\t\tCreates a named server instance.\n\n"
-
-      "\t[-1 | --self] <physical_device_file>:\n"
-         "\t\tCreates a unnamed server instance.\n\n"
-
-      "<OPTION>:\n"
-      "\t[-d | --daemon]:\n"
-         "\t\tRuns server instance in the background.\n\n"
-
-      "\t[-n | --name] <relabsd_device_name>:\n"
-         "\t\tNames the virtual device.\n\n"
-
-      "\t[-t | --timeout] <timeout_in_ms>:\n"
-         "\t\tSets a zeroing timeout (0 to disable).\n\n"
-
-      "\t[-a | --axis] <name> <min> <max> <fuzz> <flat> <resolution> "
-         "<options>:\n"
-         "\t\t(Re)defines an axis.\n\n"
-
-      "\t[-m | --mod-axis] <name> <min> <max> <fuzz> <flat> <resolution> "
-         "<signed_options>:\n"
-         "\t\tModifies an axis (use + and - signs for the options).\n\n"
-
-      "\t[-f | --config] <config_file>"
-         "<options>:\n"
-         "\t\t(Re)defines an axis.\n",
-      exec
-   );
-}
-
 static int parse_axis
 (
    const int argc,
@@ -135,14 +91,14 @@ int relabsd_parameters_parse_execution_mode
 (
    const int argc,
    const char * argv [const restrict static argc],
-   struct relabsd_parameters params [const restrict static 1]
+   struct relabsd_parameters parameters [const restrict static 1]
 )
 {
    RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Parsing exec mode...");
 
    if (argc < 3)
    {
-      print_usage(argv[0]);
+      relabsd_parameters_print_usage(argv[0]);
 
       return -1;
    }
@@ -153,9 +109,9 @@ int relabsd_parameters_parse_execution_mode
       || RELABSD_STRING_EQUALS("--compatibility", argv[1])
    )
    {
-      params->mode = RELABSD_PARAMETERS_COMPATIBILITY_TEST_MODE;
-      params->physical_device_name = argv[2];
-      params->read_argc = 2;
+      parameters->mode = RELABSD_PARAMETERS_COMPATIBILITY_TEST_MODE;
+      parameters->physical_device_name = argv[2];
+      parameters->read_argc = 2;
    }
    else if
    (
@@ -163,10 +119,10 @@ int relabsd_parameters_parse_execution_mode
       || RELABSD_STRING_EQUALS("--client", argv[1])
    )
    {
-      params->mode = RELABSD_PARAMETERS_CLIENT_MODE;
-      params->communication_node_name = argv[2];
-      params->physical_device_name = (char *) NULL;
-      params->read_argc = 2;
+      parameters->mode = RELABSD_PARAMETERS_CLIENT_MODE;
+      parameters->communication_node_name = argv[2];
+      parameters->physical_device_name = (const char *) NULL;
+      parameters->read_argc = 2;
    }
    else if
    (
@@ -174,10 +130,10 @@ int relabsd_parameters_parse_execution_mode
       || RELABSD_STRING_EQUALS("--server", argv[1])
    )
    {
-      params->mode = RELABSD_PARAMETERS_SERVER_MODE;
-      params->communication_node_name = argv[2];
-      params->physical_device_name = argv[3];
-      params->read_argc = 3;
+      parameters->mode = RELABSD_PARAMETERS_SERVER_MODE;
+      parameters->communication_node_name = argv[2];
+      parameters->physical_device_name = argv[3];
+      parameters->read_argc = 3;
    }
    else if
    (
@@ -185,14 +141,14 @@ int relabsd_parameters_parse_execution_mode
       || RELABSD_STRING_EQUALS("--self", argv[1])
    )
    {
-      params->mode = RELABSD_PARAMETERS_SERVER_MODE;
-      params->communication_node_name = (char *) NULL;
-      params->physical_device_name = argv[2];
-      params->read_argc = 2;
+      parameters->mode = RELABSD_PARAMETERS_SERVER_MODE;
+      parameters->communication_node_name = (char *) NULL;
+      parameters->physical_device_name = argv[2];
+      parameters->read_argc = 2;
    }
    else
    {
-      print_usage(argv[0]);
+      relabsd_parameters_print_usage(argv[0]);
 
       return -1;
    }
@@ -205,15 +161,15 @@ int relabsd_parameters_parse_execution_mode
 int relabsd_parameters_parse_options
 (
    const int argc,
-   const char * argv [const restrict static argc],
-   struct relabsd_parameters params [const restrict static 1]
+   const char * const argv [const restrict static argc],
+   struct relabsd_parameters parameters [const restrict static 1]
 )
 {
    int i;
 
    RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Parsing options...");
 
-   set_default_options(params);
+   relabsd_parameters_initialize_options(parameters);
 
    /*
     * i = (params->read_argc + 1) because reading 2 params is actually reaching
@@ -252,7 +208,7 @@ int relabsd_parameters_parse_options
          }
 
          ++i;
-         params->name = argv[i];
+         params->device_name = argv[i];
       }
       else if
       (
@@ -263,7 +219,7 @@ int relabsd_parameters_parse_options
          if (argc == i)
          {
             RELABSD_FATAL("Missing value for \"%s\" <OPTION>.", argv[i]);
-            print_usage(argv[0]);
+            relabsd_parameters_print_usage(argv[0]);
 
             return -1;
          }
@@ -284,7 +240,7 @@ int relabsd_parameters_parse_options
                INT_MAX
             );
 
-            print_usage(argv[0]);
+            relabsd_parameters_print_usage(argv[0]);
 
             return -1;
          }
@@ -298,7 +254,7 @@ int relabsd_parameters_parse_options
          if (argc == i)
          {
             RELABSD_FATAL("Missing values for \"%s\" <OPTION>.", argv[i]);
-            print_usage(argv[0]);
+            relabsd_parameters_print_usage(argv[0]);
 
             return -1;
          }
@@ -307,7 +263,7 @@ int relabsd_parameters_parse_options
 
          if (parse_axis((argc - i), (argv + i), params->axes) < 0)
          {
-            print_usage(argv[0]);
+            relabsd_parameters_print_usage(argv[0]);
 
             return -1;
          }
@@ -321,18 +277,18 @@ int relabsd_parameters_parse_options
          if (argc == i)
          {
             RELABSD_FATAL("Missing value for \"%s\" <OPTION>.", argv[i]);
-            print_usage(argv[0]);
+            relabsd_parameters_print_usage(argv[0]);
 
             return -1;
          }
 
          ++i;
-         params->config_file = argv[i];
+         params->configuration_file = argv[i];
       }
       else
       {
          RELABSD_FATAL("Unknown <OPTION> \"%s\".", argv[i]);
-         print_usage(argv[0]);
+         relabsd_parameters_print_usage(argv[0]);
 
          return -1;
       }
@@ -342,3 +298,109 @@ int relabsd_parameters_parse_options
 
    return 0;
 }
+
+int relabsd_parameters_argument_count_for
+(
+   const char option [const restrict static 1],
+   int result [const restrict static 1]
+)
+{
+   if
+   (
+      RELABSD_STRING_EQUALS("-n", option)
+      || RELABSD_STRING_EQUALS("--name", option)
+   )
+   {
+      *result = 0;
+   }
+   else if
+   (
+      RELABSD_STRING_EQUALS("-n", option)
+      || RELABSD_STRING_EQUALS("--name", option)
+   )
+   {
+      *result = 1;
+   }
+   else if
+   (
+      RELABSD_STRING_EQUALS("-t", option)
+      || RELABSD_STRING_EQUALS("--timeout", option)
+   )
+   {
+      *result = 1;
+   }
+   else if
+   (
+      RELABSD_STRING_EQUALS("-a", option)
+      || RELABSD_STRING_EQUALS("--axis", option)
+   )
+   {
+      *result = 7;
+   }
+   else if
+   (
+      RELABSD_STRING_EQUALS("-m", option)
+      || RELABSD_STRING_EQUALS("--mod-axis", option)
+   )
+   {
+      *result = 7;
+   }
+   else if
+   (
+      RELABSD_STRING_EQUALS("-f", option)
+      || RELABSD_STRING_EQUALS("--config", option)
+   )
+   {
+      *result = 1;
+   }
+   else
+   {
+      return -1;
+   }
+
+   return 0;
+}
+
+void relabsd_parameters_print_usage (const char exec [const restrict static 1])
+{
+   printf
+   (
+      "USAGE: %s <MODE> [<OPTION>+]\n\n"
+
+      "<MODE>:\n"
+      "\t[-? | --compatible] <physical_device_file>:\n"
+         "\t\tDevice compatibility test.\n\n"
+
+      "\t[-c | --client] <server_file>:\n"
+         "\t\tSends the commands to a given server instance.\n\n"
+
+      "\t[-s | --server] <server_file> <physical_device_file>:\n"
+         "\t\tCreates a named server instance.\n\n"
+
+      "\t[-1 | --self] <physical_device_file>:\n"
+         "\t\tCreates a unnamed server instance.\n\n"
+
+      "<OPTION>:\n"
+      "\t[-d | --daemon]:\n"
+         "\t\tRuns server instance in the background.\n\n"
+
+      "\t[-n | --name] <relabsd_device_name>:\n"
+         "\t\tNames the virtual device.\n\n"
+
+      "\t[-t | --timeout] <timeout_in_ms>:\n"
+         "\t\tSets a zeroing timeout (0 to disable).\n\n"
+
+      "\t[-a | --axis] <name> <min> <max> <fuzz> <flat> <resolution> "
+         "<options>:\n"
+         "\t\t(Re)defines an axis.\n\n"
+
+      "\t[-m | --mod-axis] <name> <min> <max> <fuzz> <flat> <resolution> "
+         "<signed_options>:\n"
+         "\t\tModifies an axis (use + and - signs for the options).\n\n"
+
+      "\t[-f | --config] <config_file>"
+         "<options>:\n"
+         "\t\t(Re)defines an axis.\n",
+      exec
+   );
+}
diff --git a/src/config/parameters/parameters_accessors.c b/src/config/parameters/parameters_accessors.c
new file mode 100644
index 0000000..e53cfe0
--- /dev/null
+++ b/src/config/parameters/parameters_accessors.c
@@ -0,0 +1,60 @@
+#include <relabsd/config/parameters.h>
+
+/******************************************************************************/
+/**** LOCAL FUNCTIONS *********************************************************/
+/******************************************************************************/
+
+/******************************************************************************/
+/**** EXPORTED FUNCTIONS ******************************************************/
+/******************************************************************************/
+void relabsd_parameters_initialize_options
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   parameters->run_as_daemon = 0;
+   parameters->communication_node_name = (const char *) NULL;
+   parameters->device_name = (const char *) NULL;
+   parameters->physical_device_file_name = (const char *) NULL;
+   parameters->configuration_file = (const char *) NULL;
+}
+
+int relabsd_parameters_get_run_as_daemon
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   return parameters->run_as_daemon;
+}
+
+const char * relabsd_parameters_get_communication_node_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   return parameters->communication_node_name;
+}
+
+const char * relabsd_parameters_get_device_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   return parameters->device_name;
+}
+
+const char * relabsd_parameters_get_physical_device_file_name
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   return parameters->physical_device_file_name;
+}
+
+enum relabsd_parameters_run_mode relabsd_parameters_get_execution_mode
+(
+   const struct relabsd_parameters parameters [const restrict static 1]
+)
+{
+   return parameters->mode;
+}
diff --git a/src/device/axis/axis.c b/src/device/axis/axis.c
new file mode 100644
index 0000000..75afad8
--- /dev/null
+++ b/src/device/axis/axis.c
@@ -0,0 +1,34 @@
+/**** POSIX *******************************************************************/
+#include <string.h>
+
+/**** RELABSD *****************************************************************/
+#include <relabsd/device/axis.h>
+
+/******************************************************************************/
+/**** LOCAL FUNCTIONS *********************************************************/
+/******************************************************************************/
+
+/******************************************************************************/
+/**** EXPORTED FUNCTIONS ******************************************************/
+/******************************************************************************/
+void relabsd_axis_initialize
+(
+   struct relabsd_axis axis [const restrict static 1]
+)
+{
+   (void) memset(axis, 0, sizeof(struct relabsd_axis));
+}
+
+void relabsd_axis_to_absinfo
+(
+   struct relabsd_axis axis [const restrict static 1]
+   struct input_absinfo absinfo [const restrict static 1]
+)
+{
+   absinfo->value = (__s32) 0;
+   absinfo->minimum = (__s32) axis->min;
+   absinfo->maximum = (__s32) axis->max;
+   absinfo->fuzz = (__s32) axis->fuzz;
+   absinfo->flat = (__s32) axis->flat;
+   absinfo->resolution = (__s32) axis->resolution;
+}
diff --git a/src/device/axis/axis_filter.c b/src/device/axis/axis_filter.c
new file mode 100644
index 0000000..295a7f6
--- /dev/null
+++ b/src/device/axis/axis_filter.c
@@ -0,0 +1,131 @@
+/**** RELABSD *****************************************************************/
+#include <relabsd/device/axis.h>
+
+/******************************************************************************/
+/**** LOCAL FUNCTIONS *********************************************************/
+/******************************************************************************/
+static int direct_filter
+(
+   struct relabsd_config_axis * const axis,
+   int * const value
+)
+{
+   if (abs(*value - axis->previous_value) <= axis->fuzz)
+   {
+      if (axis->option[RELABSD_REAL_FUZZ_OPTION])
+      {
+         axis->previous_value = *value;
+      }
+
+      return -1;
+   }
+
+   if (*value < axis->min)
+   {
+      *value = axis->min;
+   }
+   else if (*value > axis->max)
+   {
+      *value = axis->max;
+   }
+   else if (abs(*value) <= axis->flat)
+   {
+      *value = 0;
+   }
+
+   if (*value == axis->previous_value)
+   {
+      return -1;
+   }
+
+   axis->previous_value = *value;
+
+   return 1;
+}
+
+static int rel_to_abs_filter
+(
+   struct relabsd_config_axis * const axis,
+   int * const value
+)
+{
+   long int guard;
+
+   guard = (((long int) axis->previous_value) + ((long int) *value));
+
+   if (guard < ((long int) INT_MIN))
+   {
+      guard = ((long int) INT_MIN);
+   }
+   else if (guard > ((long int) INT_MAX))
+   {
+      guard = ((long int) INT_MAX);
+   }
+
+   *value = (int) guard;
+
+   if (axis->option[RELABSD_FRAMED_OPTION])
+   {
+      if (*value < axis->min)
+      {
+         *value = axis->min;
+      }
+      else if (*value > axis->max)
+      {
+         *value = axis->max;
+      }
+
+      if (*value == axis->previous_value)
+      {
+         return 0;
+      }
+
+      axis->previous_value = *value;
+
+      return 1;
+   }
+   else
+   {
+      if (*value == axis->previous_value)
+      {
+         return 0;
+      }
+
+      axis->previous_value = *value;
+
+      if ((*value < axis->min) || (*value > axis->max))
+      {
+         return 0;
+      }
+      else
+      {
+         return 1;
+      }
+   }
+}
+
+/******************************************************************************/
+/**** EXPORTED FUNCTIONS ******************************************************/
+/******************************************************************************/
+int relabsd_axis_filter_new_value
+(
+   struct relabsd_axis axis [const restrict static 1],
+   int value [const restrict static 1]
+)
+{
+   if (!(axis->is_enabled))
+   {
+      return;
+   }
+
+   /* TODO: handle conf->axis[axis].resolution */
+
+   if (axis->flag[RELABSD_DIRECT_OPTION])
+   {
+      return direct_filter(axis, value);
+   }
+   else
+   {
+      return rel_to_abs_filter(axis, value);
+   }
+}
diff --git a/src/server/server.c b/src/server/server.c
index ddd9bdf..d6678d2 100644
--- a/src/server/server.c
+++ b/src/server/server.c
@@ -8,19 +8,19 @@
 /******************************************************************************/
 /**** LOCAL FUNCTIONS *********************************************************/
 /******************************************************************************/
-int initialize
+static int initialize
 (
    struct relabsd_server server [const restrict static 1],
-   struct relabsd_parameters params [const static 1]
+   struct relabsd_parameters parameters [const static 1]
 )
 {
-   server->parameters = params;
+   server->parameters = parameters;
 
    if
    (
       relabsd_physical_device_open
       (
-         relabsd_parameters_get_physical_device_name(params),
+         relabsd_parameters_get_physical_device_name(parameters),
          &(server->physical_device)
       )
       < 0
@@ -29,15 +29,7 @@ int initialize
       return -1;
    }
 
-   if
-   (
-      relabsd_virtual_device_create
-      (
-         relabsd_parameters_get_virtual_device_name(params),
-         &(server->virtual_device)
-      )
-      < 0
-   )
+   if (relabsd_virtual_device_create(parameters, &(server->virtual_device)) < 0)
    {
       relabsd_physical_device_close(&(server->physical_device));
 
@@ -46,8 +38,11 @@ int initialize
 
    if
    (
-      (relabsd_parameters_get_communication_node(params) != ((...) NULL))
-      && (relabsd_server_spawn_communication_node(server) < 0)
+      (
+         relabsd_parameters_get_communication_node_name(parameters)
+         != ((char *) NULL)
+      )
+      && (relabsd_server_create_communication_thread(&server) < 0)
    )
    {
       relabsd_virtual_device_destroy(&(server->virtual_device));
@@ -56,19 +51,14 @@ int initialize
       return -3;
    }
 
-   if (relabsd_parameters_get_communication_node(params) != ((char *) NULL))
-   {
-      relabsd_server_create_communication_thread(&server);
-   }
-
    return 0;
 }
 
-void finalize (struct relabsd_server server [const static 1])
+static void finalize (struct relabsd_server server [const static 1])
 {
    if
    (
-      relabsd_parameters_get_communication_node(server->parameters)
+      relabsd_parameters_get_communication_node_name(server->parameters)
       != ((char *) NULL)
    )
    {
@@ -77,8 +67,6 @@ void finalize (struct relabsd_server server [const static 1])
 
    relabsd_virtual_device_destroy(&(server->virtual_device));
    relabsd_physical_device_close(&(server->physical_device));
-
-   return 0;
 }
 
 /******************************************************************************/
@@ -88,34 +76,33 @@ int relabsd_server
 (
    const int argc,
    const char * const argv [const restrict static argc],
-   struct relabsd_parameters params [const static 1]
+   struct relabsd_parameters parameters [const static 1]
 )
 {
    struct relabsd_server server;
 
    RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Started server mode.");
 
-   if (relabsd_parameters_parse_options(argc, argv, params) < 0)
+   if (relabsd_parameters_parse_options(argc, argv, parameters) < 0)
    {
       return -1;
    }
 
    if
    (
-      (relabsd_parameters_run_as_daemon(params))
+      relabsd_parameters_get_run_as_daemon(parameters)
       && (relabsd_server_create_daemon() < 0)
    )
    {
       return -2;
    }
 
-   (void) initialize(&server, params);
+   (void) initialize(&server, parameters);
 
    (void) relabsd_server_conversion_loop(&server);
 
    finalize(&server);
 
-
    RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Completed server mode.");
 
    return 0;