git.sur5r.net Git - cc65/blob - libsrc/em/em_load.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                em_load.c                                  */
   4 /*                                                                           */
   5 /*                       Loader module for EM drivers                        */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2002-2003 Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 52                                             */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  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 <string.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39 #include <modload.h>
  40 #include <em.h>
  41 #include <em/em-kernel.h>
  42
  43
  44
  45 unsigned char __fastcall__ em_load_driver (const char* name)
  46 /* Load an extended memory driver and return an error code */
  47 {
  48     static struct mod_ctrl ctrl = {
  49         read            /* Read from disk */
  50     };
  51     unsigned char Res;
  52
  53     /* Check if we do already have a driver loaded. If so, remove it. */
  54     if (em_drv != 0) {
  55         em_uninstall ();
  56     }
  57
  58     /* Now open the file */
  59     ctrl.callerdata = open (name, O_RDONLY);
  60     if (ctrl.callerdata >= 0) {
  61
  62         /* Load the module */
  63         Res = mod_load (&ctrl);
  64
  65         /* Close the input file */
  66         close (ctrl.callerdata);
  67
  68         /* Check the return code */
  69         if (Res == MLOAD_OK) {
  70
  71             /* Check the driver signature, install the driver */
  72             return em_install (ctrl.module);
  73
  74         }
  75     }
  76
  77     /* Error loading the driver */
  78     return EM_ERR_CANNOT_LOAD;
  79 }
  80
  81
  82