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diff --git a/src/tinytacutil.h b/src/tinytacutil.h
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+++ b/src/tinytacutil.h
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+/*
+ *  Tiny TACACS+ Client Library
+ *  Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are
+ *  met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of David M. Syzdek nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ *  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M. SYZDEK BE LIABLE FOR
+ *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ *  SUCH DAMAGE.
+ */
+#ifndef _SRC_TTU_TINYTACUTIL_H
+#define _SRC_TTU_TINYTACUTIL_H 1
+
+///////////////
+//           //
+//  Headers  //
+//           //
+///////////////
+#pragma mark - Headers
+
+#include <tinytac_compat.h>
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <tinytac.h>
+
+
+///////////////////
+//               //
+//  Definitions  //
+//               //
+///////////////////
+#pragma mark - Definitions
+
+#undef PROGRAM_NAME
+#define PROGRAM_NAME "tinytac"
+
+#define TTUTILS_OPT_QUIET           0x00000001U
+#define TTUTILS_OPT_VERBOSE         0x00000002U
+#define TTUTILS_OPT_PASSPROMPT      0x00000004U
+
+
+//////////////////
+//              //
+//  Data Types  //
+//              //
+//////////////////
+#pragma mark - Data Types
+
+typedef struct _tinytac_util_widget     ttu_widget_t;
+typedef struct _tinytac_util_config     ttu_config_t;
+
+struct _tinytac_util_config
+{
+   unsigned                   opts;
+   int                        argc;
+   char **                    argv;
+   const char *               pass;
+   const char *               pass_file;
+   char *                     pass_buff;
+   const char *               prog_name;
+   const ttu_widget_t *       widget;
+   TinyTac *                  tt;
+};
+
+
+struct _tinytac_util_widget
+{
+   const char *               name;
+   const char *               desc;
+   const char *               usage;
+   const char * const *       aliases;
+   int  (*func_exec)(ttu_config_t * cnf);
+   int  (*func_usage)(ttu_config_t * cnf);
+};
+
+
+/////////////////
+//             //
+//  Variables  //
+//             //
+/////////////////
+#pragma mark - Variables
+
+extern ttu_widget_t ttu_widget_map[];
+
+
+//////////////////
+//              //
+//  Prototypes  //
+//              //
+//////////////////
+#pragma mark - Prototypes
+
+//--------------------//
+// logging prototypes //
+//--------------------//
+#pragma mark logging prototypes
+
+extern int
+ttu_error(
+         ttu_config_t *                cnf,
+         int                           rc,
+         const char *                  fmt,
+         ... );
+
+
+extern int
+ttu_printf(
+         ttu_config_t *                cnf,
+         const char *                  fmt,
+         ... );
+
+
+extern int
+tru_verbose(
+         ttu_config_t *                cnf,
+         const char *                  fmt,
+         ... );
+
+
+//--------------------------//
+// miscellaneous prototypes //
+//--------------------------//
+#pragma mark miscellaneous prototypes
+
+extern char *
+ttu_file2str(
+         const char *                  path );
+
+
+extern int
+ttu_password(
+         ttu_config_t *                cnf );
+
+
+//------------------//
+// usage prototypes //
+//------------------//
+#pragma mark usage prototypes
+
+extern int
+ttu_cli_arguments(
+         ttu_config_t *                cnf,
+         int                           argc,
+         char * const *                argv );
+
+
+extern int
+ttu_usage(
+         ttu_config_t *                cnf );
+
+
+//-------------------//
+// widget prototypes //
+//-------------------//
+#pragma mark widget prototypes
+
+extern int
+ttu_widget_acct(
+         ttu_config_t *                cnf );
+
+
+extern int
+ttu_widget_authen(
+         ttu_config_t *                cnf );
+
+
+extern int
+ttu_widget_author(
+         ttu_config_t *                cnf );
+
+
+extern int
+ttu_widget_config(
+         ttu_config_t *                cnf );
+
+
+#endif /* end of header */