examples.api/jim_return.c

   1 /*-
   2  * Copyright (c) 2010 Wojciech A. Koszek <wkoszek@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $Id$
  27  */
  28
  29 #include <assert.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #define JIM_EMBEDDED
  35 #include <jim.h>
  36
  37 /*
  38  * Program which we want to get executed.
  39  */
  40 #define JIM_PROGRAM     "set l [CountChars Sample]; puts $l"
  41
  42 /*
  43  * Our function.
  44  */
  45 static int
  46 CountCharsFunc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  47 {
  48         if (argc != 2) {
  49                 Jim_WrongNumArgs(interp, 1, argv, "string");
  50                 return (JIM_ERR);
  51         }
  52         Jim_SetResult(interp, Jim_NewIntObj(interp, Jim_Length(argv[1])));
  53         return (JIM_OK);
  54 }
  55
  56 /*
  57  * Now we try to write big enough code to duplication our array in Jim's
  58  * list implementation. Later, we try to load a sample script in Tcl that
  59  * could print our list.
  60  */
  61 int
  62 main(int argc, char **argv)
  63 {
  64         Jim_Interp *interp;
  65         int error;
  66
  67         /* Create an interpreter. */
  68         interp = Jim_CreateInterp();
  69         assert(interp != NULL && "couldn't create interpreter");
  70
  71         /* We register base commands, so that we actually implement Tcl. */
  72         Jim_RegisterCoreCommands(interp);
  73
  74         /* And initialise any static extensions */
  75         Jim_InitStaticExtensions(interp);
  76
  77
  78         /* Register our Jim command. */
  79         Jim_CreateCommand(interp, "CountChars", CountCharsFunc,
  80             NULL, NULL);
  81
  82         /* Run a script. */
  83         error = Jim_Eval(interp, JIM_PROGRAM);
  84         if (error == JIM_ERR) {
  85                 Jim_MakeErrorMessage(interp);
  86                 fprintf(stderr, "%s\n", Jim_GetString(Jim_GetResult(interp), NULL));
  87                 Jim_FreeInterp(interp);
  88                 exit(EXIT_FAILURE);
  89         }
  90
  91         Jim_FreeInterp(interp);
  92         return (EXIT_SUCCESS);
  93 }