git.sur5r.net Git - cc65/blob - src/sim65/chips/stdio.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                  stdio.c                                  */
   4 /*                                                                           */
   5 /*                 STDIO plugin for the sim65 6502 simulator                 */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2002      Ullrich von Bassewitz                                       */
  10 /*               Wacholderweg 14                                             */
  11 /*               D-70597 Stuttgart                                           */
  12 /* EMail:        uz@musoftware.de                                            */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 /* common */
  41 #include "attrib.h"
  42
  43 /* sim65 */
  44 #include "chipif.h"
  45
  46
  47
  48 /*****************************************************************************/
  49 /*                                   Forwards                                */
  50 /*****************************************************************************/
  51
  52
  53
  54 int InitChip (const struct SimData* Data);
  55 /* Initialize the chip, return an error code */
  56
  57 static void* InitInstance (unsigned Addr, unsigned Range);
  58 /* Initialize a new chip instance */
  59
  60 static void Write (void* Data, unsigned Addr, unsigned char Val);
  61 /* Write user data */
  62
  63 static unsigned char Read (void* Data, unsigned Addr);
  64 /* Read user data */
  65
  66
  67
  68 /*****************************************************************************/
  69 /*                                     Data                                  */
  70 /*****************************************************************************/
  71
  72
  73
  74 /* Control data passed to the main program */
  75 static const struct ChipData RAMData[1] = {
  76     {
  77         "STDIO",                /* Name of the chip */
  78         CHIPDATA_VER_MAJOR,     /* Version information */
  79         CHIPDATA_VER_MINOR,
  80
  81         /* -- Exported functions -- */
  82         InitChip,
  83         InitInstance,
  84         Write,
  85         Write,
  86         Read,
  87         Read
  88     }
  89 };
  90
  91 /* The SimData pointer we get when InitChip is called */
  92 static const SimData* Sim;
  93
  94
  95
  96 /*****************************************************************************/
  97 /*                               Exported function                           */
  98 /*****************************************************************************/
  99
 100
 101
 102 int GetChipData (const ChipData** Data, unsigned* Count)
 103 {
 104     /* Pass the control structure to the caller */
 105     *Data = RAMData;
 106     *Count = sizeof (Data) / sizeof (Data[0]);
 107
 108     /* Call was successful */
 109     return 0;
 110 }
 111
 112
 113
 114 /*****************************************************************************/
 115 /*                                     Code                                  */
 116 /*****************************************************************************/
 117
 118
 119
 120 int InitChip (const struct SimData* Data)
 121 /* Initialize the chip, return an error code */
 122 {
 123     /* Remember the pointer */
 124     Sim = Data;
 125
 126     /* Always successful */
 127     return 0;
 128 }
 129
 130
 131
 132 static void* InitInstance (unsigned Addr attribute ((unused)),
 133                            unsigned Range attribute ((unused)))
 134 /* Initialize a new chip instance */
 135 {
 136     /* We don't need any instance data */
 137     return 0;
 138 }
 139
 140
 141
 142 static void Write (void* Data attribute ((unused)),
 143                    unsigned Addr attribute ((unused)),
 144                    unsigned char Val)
 145 /* Write user data */
 146 {
 147     putchar (Val);
 148 }
 149
 150
 151
 152 static unsigned char Read (void* Data attribute ((unused)),
 153                            unsigned Addr attribute ((unused)))
 154 /* Read user data */
 155 {
 156     /* Read a character and return the value */
 157     return getchar ();
 158 }
 159
 160
 161