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f98c3a0758
save some overhead. Adapt to the new read conventions in modload. git-svn-id: svn://svn.cc65.org/cc65/trunk@1549 b7a2c559-68d2-44c3-8de9-860c34a00d81
116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*****************************************************************************/
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/* */
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/* tgi_load.c */
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/* */
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/* Loader module for TGI drivers */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <string.h>
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#include <fcntl.h>
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#include <modload.h>
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#include <tgi.h>
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#include <tgi/tgi-kernel.h>
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void __fastcall__ tgi_load (unsigned char mode)
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/* Install the matching driver for the given mode. Will just load the driver
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* and check if loading was successul. Will not switch to gaphics mode.
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*/
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{
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const char* name = tgi_map_mode (mode);
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if (name == 0) {
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/* No driver for this mode */
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tgi_error = TGI_ERR_NO_DRIVER;
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} else {
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/* Laod the driver */
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tgi_load_driver (name);
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}
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}
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void __fastcall__ tgi_load_driver (const char* name)
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/* Install the given driver. This function is identical to tgi_load with the
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* only difference that the name of the driver is specified explicitly. You
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* should NOT use this function in most cases, use tgi_load() instead.
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*/
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{
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static const unsigned char marker[4] = { 0x74, 0x67, 0x69, 0x00 };
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static struct mod_ctrl ctrl = {
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read /* Read from disk */
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};
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unsigned Res;
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/* Check if we do already have a driver loaded. If so, remove it. */
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if (tgi_drv != 0) {
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tgi_unload ();
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}
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/* Now open the file */
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ctrl.callerdata = open (name, O_RDONLY);
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if (ctrl.callerdata < 0) {
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tgi_error = TGI_ERR_CANNOT_LOAD;
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return;
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}
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/* Load the module */
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Res = mod_load (&ctrl);
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/* Close the input file */
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close (ctrl.callerdata);
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/* Check the return code */
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if (Res == MLOAD_OK) {
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/* Get a pointer to the loaded driver */
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tgi_drv = (tgi_drv_header*) ctrl.module;
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/* Check the header */
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if (memcmp (tgi_drv, marker, sizeof (marker)) != 0) {
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/* Invalid driver */
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mod_free (tgi_drv);
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tgi_drv = 0;
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tgi_error = TGI_ERR_INV_DRIVER;
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} else {
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/* Driver is ok do setup */
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tgi_setup ();
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}
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} else {
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/* Error loading the driver */
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tgi_error = TGI_ERR_CANNOT_LOAD;
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}
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}
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