Thomas Mertes <thomas.mertes_at_gmx.at>
Implement file control block (FCB) functions: INT21_OpenFileUsingFCB [0x0f], INT21_CloseFileUsingFCB [0x10], INT21_SequenialReadFromFCB [0x14], INT21_SequenialWriteToFCB [0x15], INT21_ReadRandomRecordFromFCB [0x21], INT21_WriteRandomRecordToFCB [0x22], INT21_RandomBlockReadFromFCB [0x27], INT21_RandomBlockWriteToFCB [0x28].
This commit is contained in:
Alexandre Julliard
parent
cee5576012
commit
3b4143aea0
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@ -6,6 +6,7 @@
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* Copyright 1997 Andreas Mohr
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* Copyright 1998 Uwe Bonnes
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* Copyright 1998, 1999 Ove Kaaven
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* Copyright 2003 Thomas Mertes
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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@ -88,6 +89,34 @@ typedef struct _INT21_HEAP {
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#include "poppack.h"
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struct FCB {
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BYTE drive_number;
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CHAR file_name[8];
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CHAR file_extension[3];
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WORD current_block_number;
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WORD logical_record_size;
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DWORD file_size;
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WORD date_of_last_write;
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WORD time_of_last_write;
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BYTE file_number;
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BYTE attributes;
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WORD starting_cluster;
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WORD sequence_number;
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BYTE file_attributes;
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BYTE unused;
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BYTE record_within_current_block;
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BYTE random_access_record_number[4];
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};
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struct XFCB {
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BYTE xfcb_signature;
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BYTE reserved[5];
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BYTE xfcb_file_attribute;
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BYTE fcb[37];
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};
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/***********************************************************************
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* INT21_ReadChar
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*
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@ -347,6 +376,643 @@ static WORD INT21_BufferedInput( CONTEXT86 *context, BYTE *ptr, WORD capacity )
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}
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static BYTE *GetCurrentDTA( CONTEXT86 *context )
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{
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TDB *pTask = GlobalLock16(GetCurrentTask());
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/* FIXME: This assumes DTA was set correctly! */
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return (BYTE *)CTX_SEG_OFF_TO_LIN( context, SELECTOROF(pTask->dta),
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(DWORD)OFFSETOF(pTask->dta) );
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}
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/***********************************************************************
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* INT21_OpenFileUsingFCB
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*
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* Handler for function 0x0f.
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*
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* PARAMS
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* DX:DX [I/O] File control block (FCB or XFCB) of unopened file
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*
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* RETURNS (in AL)
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* 0x00: successful
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* 0xff: failed
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*
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* NOTES
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* Opens a FCB file for read/write in compatibility mode. Upon calling
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* the FCB must have the drive_number, file_name, and file_extension
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* fields filled and all other bytes cleared.
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*/
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static void INT21_OpenFileUsingFCB( CONTEXT86 *context )
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{
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struct FCB *fcb;
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struct XFCB *xfcb;
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char current_directory[MAX_PATH];
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char file_path[16];
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char *pos;
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HANDLE handle;
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HFILE16 hfile16;
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BY_HANDLE_FILE_INFORMATION info;
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BYTE AL_result;
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fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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if (fcb->drive_number == 0xff) {
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xfcb = (struct XFCB *) fcb;
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fcb = (struct FCB *) xfcb->fcb;
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} /* if */
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AL_result = 0;
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if (fcb->drive_number == 0) {
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if (!GetCurrentDirectoryA(sizeof(current_directory), current_directory) ||
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current_directory[1] != ':') {
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TRACE("GetCurrentDirectoryA failed\n");
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AL_result = 0xff; /* failed */
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} /* if */
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file_path[0] = toupper(current_directory[0]);
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} else {
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file_path[0] = 'A' + fcb->drive_number - 1;
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} /* if */
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if (AL_result == 0) {
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file_path[1] = ':';
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pos = &file_path[2];
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memcpy(pos, fcb->file_name, 8);
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pos[8] = ' ';
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pos[9] = '\0';
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pos = strchr(pos, ' ');
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*pos = '.';
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pos++;
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memcpy(pos, fcb->file_extension, 3);
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pos[3] = ' ';
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pos[4] = '\0';
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pos = strchr(pos, ' ');
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*pos = '\0';
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handle = (HANDLE) _lopen(file_path, OF_READWRITE);
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if (handle == INVALID_HANDLE_VALUE) {
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TRACE("_lopen(\"%s\") failed: INVALID_HANDLE_VALUE\n", file_path);
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AL_result = 0xff; /* failed */
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} else {
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hfile16 = Win32HandleToDosFileHandle(handle);
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if (hfile16 == HFILE_ERROR16) {
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TRACE("Win32HandleToDosFileHandle(%p) failed: HFILE_ERROR\n", handle);
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CloseHandle(handle);
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AL_result = 0xff; /* failed */
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} else if (hfile16 > 255) {
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TRACE("hfile16 (=%d) larger than 255 for \"%s\"\n", hfile16, file_path);
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_lclose16(hfile16);
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AL_result = 0xff; /* failed */
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} else {
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if (!GetFileInformationByHandle(handle, &info)) {
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TRACE("GetFileInformationByHandle(%d, %p) for \"%s\" failed\n",
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hfile16, handle, file_path);
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_lclose16(hfile16);
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AL_result = 0xff; /* failed */
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} else {
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fcb->drive_number = file_path[0] - 'A' + 1;
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fcb->current_block_number = 0;
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fcb->logical_record_size = 128;
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fcb->file_size = info.nFileSizeLow;
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FileTimeToDosDateTime(&info.ftLastWriteTime,
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&fcb->date_of_last_write, &fcb->time_of_last_write);
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fcb->file_number = hfile16;
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fcb->attributes = 0xc2;
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fcb->starting_cluster = 0; /* don't know correct init value */
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fcb->sequence_number = 0; /* don't know correct init value */
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fcb->file_attributes = info.dwFileAttributes;
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/* The following fields are not initialized */
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/* by the native function: */
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/* unused */
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/* record_within_current_block */
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/* random_access_record_number */
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TRACE("successful opened file \"%s\" as %d (handle %p)\n",
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file_path, hfile16, handle);
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AL_result = 0x00; /* successful */
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} /* if */
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} /* if */
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} /* if */
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} /* if */
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SET_AL(context, AL_result);
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}
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/***********************************************************************
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* INT21_CloseFileUsingFCB
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*
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* Handler for function 0x10.
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*
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* PARAMS
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* DX:DX [I/O] File control block (FCB or XFCB) of open file
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*
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* RETURNS (in AL)
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* 0x00: successful
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* 0xff: failed
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*
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* NOTES
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* Closes a FCB file.
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*/
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static void INT21_CloseFileUsingFCB( CONTEXT86 *context )
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{
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struct FCB *fcb;
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struct XFCB *xfcb;
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BYTE AL_result;
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fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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if (fcb->drive_number == 0xff) {
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xfcb = (struct XFCB *) fcb;
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fcb = (struct FCB *) xfcb->fcb;
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} /* if */
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if (_lclose16((HFILE16) fcb->file_number) != 0) {
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TRACE("_llclose16(%d) failed\n", fcb->file_number);
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AL_result = 0xff; /* failed */
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} else {
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TRACE("successful closed file %d\n", fcb->file_number);
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AL_result = 0x00; /* successful */
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} /* if */
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SET_AL(context, AL_result);
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}
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/***********************************************************************
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* INT21_SequenialReadFromFCB
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*
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* Handler for function 0x14.
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*
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* PARAMS
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* DX:DX [I/O] File control block (FCB or XFCB) of open file
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*
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* RETURNS (in AL)
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* 0: successful
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* 1: end of file, no data read
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* 2: segment wrap in DTA, no data read (not returned now)
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* 3: end of file, partial record read
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*
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* NOTES
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* Reads a record with the size FCB->logical_record_size from the FCB
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* to the disk transfer area. The position of the record is specified
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* with FCB->current_block_number and FCB->record_within_current_block.
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* Then FCB->current_block_number and FCB->record_within_current_block
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* are updated to point to the next record. If a partial record is
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* read, it is filled with zeros up to the FCB->logical_record_size.
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*/
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static void INT21_SequenialReadFromFCB( CONTEXT86 *context )
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{
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struct FCB *fcb;
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struct XFCB *xfcb;
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HANDLE handle;
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DWORD record_number;
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long position;
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BYTE *disk_transfer_area;
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UINT bytes_read;
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BYTE AL_result;
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fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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if (fcb->drive_number == 0xff) {
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xfcb = (struct XFCB *) fcb;
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fcb = (struct FCB *) xfcb->fcb;
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} /* if */
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handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
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if (handle == INVALID_HANDLE_VALUE) {
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TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
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fcb->file_number);
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AL_result = 0x01; /* end of file, no data read */
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} else {
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record_number = 128 * fcb->current_block_number + fcb->record_within_current_block;
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position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
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if (position != record_number * fcb->logical_record_size) {
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TRACE("seek(%d, %ld, 0) failed with %ld\n",
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fcb->file_number, record_number * fcb->logical_record_size, position);
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AL_result = 0x01; /* end of file, no data read */
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} else {
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disk_transfer_area = GetCurrentDTA(context);
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bytes_read = _lread((HFILE) handle, disk_transfer_area, fcb->logical_record_size);
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if (bytes_read != fcb->logical_record_size) {
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TRACE("_lread(%d, %p, %d) failed with %d\n",
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fcb->file_number, disk_transfer_area, fcb->logical_record_size, bytes_read);
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if (bytes_read == 0) {
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AL_result = 0x01; /* end of file, no data read */
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} else {
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memset(&disk_transfer_area[bytes_read], 0, fcb->logical_record_size - bytes_read);
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AL_result = 0x03; /* end of file, partial record read */
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} /* if */
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} else {
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TRACE("successful read %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
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bytes_read, record_number, position, fcb->file_number, handle);
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AL_result = 0x00; /* successful */
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} /* if */
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} /* if */
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} /* if */
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if (AL_result == 0x00 || AL_result == 0x03) {
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if (fcb->record_within_current_block == 127) {
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fcb->record_within_current_block = 0;
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fcb->current_block_number++;
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} else {
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fcb->record_within_current_block++;
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} /* if */
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} /* if */
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SET_AL(context, AL_result);
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}
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/***********************************************************************
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* INT21_SequenialWriteToFCB
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*
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* Handler for function 0x15.
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*
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* PARAMS
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* DX:DX [I/O] File control block (FCB or XFCB) of open file
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*
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* RETURNS (in AL)
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* 0: successful
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* 1: disk full
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* 2: segment wrap in DTA (not returned now)
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*
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* NOTES
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* Writes a record with the size FCB->logical_record_size from the disk
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* transfer area to the FCB. The position of the record is specified
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* with FCB->current_block_number and FCB->record_within_current_block.
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* Then FCB->current_block_number and FCB->record_within_current_block
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* are updated to point to the next record.
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*/
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static void INT21_SequenialWriteToFCB( CONTEXT86 *context )
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{
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struct FCB *fcb;
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struct XFCB *xfcb;
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HANDLE handle;
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DWORD record_number;
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long position;
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BYTE *disk_transfer_area;
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UINT bytes_written;
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BYTE AL_result;
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fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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if (fcb->drive_number == 0xff) {
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xfcb = (struct XFCB *) fcb;
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fcb = (struct FCB *) xfcb->fcb;
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} /* if */
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handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
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if (handle == INVALID_HANDLE_VALUE) {
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TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
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fcb->file_number);
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AL_result = 0x01; /* disk full */
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} else {
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record_number = 128 * fcb->current_block_number + fcb->record_within_current_block;
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position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
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if (position != record_number * fcb->logical_record_size) {
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TRACE("seek(%d, %ld, 0) failed with %ld\n",
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fcb->file_number, record_number * fcb->logical_record_size, position);
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AL_result = 0x01; /* disk full */
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} else {
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disk_transfer_area = GetCurrentDTA(context);
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bytes_written = _lwrite((HFILE) handle, disk_transfer_area, fcb->logical_record_size);
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if (bytes_written != fcb->logical_record_size) {
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TRACE("_lwrite(%d, %p, %d) failed with %d\n",
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fcb->file_number, disk_transfer_area, fcb->logical_record_size, bytes_written);
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AL_result = 0x01; /* disk full */
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} else {
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TRACE("successful written %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
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bytes_written, record_number, position, fcb->file_number, handle);
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AL_result = 0x00; /* successful */
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} /* if */
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} /* if */
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} /* if */
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if (AL_result == 0x00) {
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if (fcb->record_within_current_block == 127) {
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fcb->record_within_current_block = 0;
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fcb->current_block_number++;
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} else {
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fcb->record_within_current_block++;
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} /* if */
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} /* if */
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SET_AL(context, AL_result);
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}
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/***********************************************************************
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* INT21_ReadRandomRecordFromFCB
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*
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* Handler for function 0x21.
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*
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* PARAMS
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* DX:DX [I/O] File control block (FCB or XFCB) of open file
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*
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* RETURNS (in AL)
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* 0: successful
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* 1: end of file, no data read
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* 2: segment wrap in DTA, no data read (not returned now)
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* 3: end of file, partial record read
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*
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* NOTES
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* Reads a record with the size FCB->logical_record_size from
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* the FCB to the disk transfer area. The position of the record
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* is specified with FCB->random_access_record_number. The
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* FCB->random_access_record_number is not updated. If a partial record
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* is read, it is filled with zeros up to the FCB->logical_record_size.
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*/
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static void INT21_ReadRandomRecordFromFCB( CONTEXT86 *context )
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{
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struct FCB *fcb;
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struct XFCB *xfcb;
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HANDLE handle;
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DWORD record_number;
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long position;
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BYTE *disk_transfer_area;
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UINT bytes_read;
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BYTE AL_result;
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fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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if (fcb->drive_number == 0xff) {
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xfcb = (struct XFCB *) fcb;
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fcb = (struct FCB *) xfcb->fcb;
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} /* if */
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memcpy(&record_number, fcb->random_access_record_number, 4);
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handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
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if (handle == INVALID_HANDLE_VALUE) {
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TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
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fcb->file_number);
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AL_result = 0x01; /* end of file, no data read */
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} else {
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position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
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if (position != record_number * fcb->logical_record_size) {
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TRACE("seek(%d, %ld, 0) failed with %ld\n",
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fcb->file_number, record_number * fcb->logical_record_size, position);
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AL_result = 0x01; /* end of file, no data read */
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} else {
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disk_transfer_area = GetCurrentDTA(context);
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bytes_read = _lread((HFILE) handle, disk_transfer_area, fcb->logical_record_size);
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if (bytes_read != fcb->logical_record_size) {
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TRACE("_lread(%d, %p, %d) failed with %d\n",
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fcb->file_number, disk_transfer_area, fcb->logical_record_size, bytes_read);
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if (bytes_read == 0) {
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AL_result = 0x01; /* end of file, no data read */
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} else {
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memset(&disk_transfer_area[bytes_read], 0, fcb->logical_record_size - bytes_read);
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AL_result = 0x03; /* end of file, partial record read */
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} /* if */
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} else {
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TRACE("successful read %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
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bytes_read, record_number, position, fcb->file_number, handle);
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AL_result = 0x00; /* successful */
|
||||
} /* if */
|
||||
} /* if */
|
||||
} /* if */
|
||||
fcb->current_block_number = record_number / 128;
|
||||
fcb->record_within_current_block = record_number % 128;
|
||||
SET_AL(context, AL_result);
|
||||
}
|
||||
|
||||
|
||||
/***********************************************************************
|
||||
* INT21_WriteRandomRecordToFCB
|
||||
*
|
||||
* Handler for function 0x22.
|
||||
*
|
||||
* PARAMS
|
||||
* DX:DX [I/O] File control block (FCB or XFCB) of open file
|
||||
*
|
||||
* RETURNS (in AL)
|
||||
* 0: successful
|
||||
* 1: disk full
|
||||
* 2: segment wrap in DTA (not returned now)
|
||||
*
|
||||
* NOTES
|
||||
* Writes a record with the size FCB->logical_record_size from
|
||||
* the disk transfer area to the FCB. The position of the record
|
||||
* is specified with FCB->random_access_record_number. The
|
||||
* FCB->random_access_record_number is not updated.
|
||||
*/
|
||||
static void INT21_WriteRandomRecordToFCB( CONTEXT86 *context )
|
||||
{
|
||||
struct FCB *fcb;
|
||||
struct XFCB *xfcb;
|
||||
HANDLE handle;
|
||||
DWORD record_number;
|
||||
long position;
|
||||
BYTE *disk_transfer_area;
|
||||
UINT bytes_written;
|
||||
BYTE AL_result;
|
||||
|
||||
fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
|
||||
if (fcb->drive_number == 0xff) {
|
||||
xfcb = (struct XFCB *) fcb;
|
||||
fcb = (struct FCB *) xfcb->fcb;
|
||||
} /* if */
|
||||
|
||||
memcpy(&record_number, fcb->random_access_record_number, 4);
|
||||
handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
|
||||
if (handle == INVALID_HANDLE_VALUE) {
|
||||
TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
|
||||
fcb->file_number);
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
|
||||
if (position != record_number * fcb->logical_record_size) {
|
||||
TRACE("seek(%d, %ld, 0) failed with %ld\n",
|
||||
fcb->file_number, record_number * fcb->logical_record_size, position);
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
disk_transfer_area = GetCurrentDTA(context);
|
||||
bytes_written = _lwrite((HFILE) handle, disk_transfer_area, fcb->logical_record_size);
|
||||
if (bytes_written != fcb->logical_record_size) {
|
||||
TRACE("_lwrite(%d, %p, %d) failed with %d\n",
|
||||
fcb->file_number, disk_transfer_area, fcb->logical_record_size, bytes_written);
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
TRACE("successful written %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
|
||||
bytes_written, record_number, position, fcb->file_number, handle);
|
||||
AL_result = 0x00; /* successful */
|
||||
} /* if */
|
||||
} /* if */
|
||||
} /* if */
|
||||
fcb->current_block_number = record_number / 128;
|
||||
fcb->record_within_current_block = record_number % 128;
|
||||
SET_AL(context, AL_result);
|
||||
}
|
||||
|
||||
|
||||
/***********************************************************************
|
||||
* INT21_RandomBlockReadFromFCB
|
||||
*
|
||||
* Handler for function 0x27.
|
||||
*
|
||||
* PARAMS
|
||||
* CX [I/O] Number of records to read
|
||||
* DX:DX [I/O] File control block (FCB or XFCB) of open file
|
||||
*
|
||||
* RETURNS (in AL)
|
||||
* 0: successful
|
||||
* 1: end of file, no data read
|
||||
* 2: segment wrap in DTA, no data read (not returned now)
|
||||
* 3: end of file, partial record read
|
||||
*
|
||||
* NOTES
|
||||
* Reads several records with the size FCB->logical_record_size from
|
||||
* the FCB to the disk transfer area. The number of records to be
|
||||
* read is specified in the CX register. The position of the first
|
||||
* record is specified with FCB->random_access_record_number. The
|
||||
* FCB->random_access_record_number, the FCB->current_block_number
|
||||
* and FCB->record_within_current_block are updated to point to the
|
||||
* next record after the records read. If a partial record is read,
|
||||
* it is filled with zeros up to the FCB->logical_record_size. The
|
||||
* CX register is set to the number of successfully read records.
|
||||
*/
|
||||
static void INT21_RandomBlockReadFromFCB( CONTEXT86 *context )
|
||||
{
|
||||
struct FCB *fcb;
|
||||
struct XFCB *xfcb;
|
||||
HANDLE handle;
|
||||
DWORD record_number;
|
||||
long position;
|
||||
BYTE *disk_transfer_area;
|
||||
UINT records_requested;
|
||||
UINT bytes_requested;
|
||||
UINT bytes_read;
|
||||
UINT records_read;
|
||||
BYTE AL_result;
|
||||
|
||||
fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
|
||||
if (fcb->drive_number == 0xff) {
|
||||
xfcb = (struct XFCB *) fcb;
|
||||
fcb = (struct FCB *) xfcb->fcb;
|
||||
} /* if */
|
||||
|
||||
memcpy(&record_number, fcb->random_access_record_number, 4);
|
||||
handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
|
||||
if (handle == INVALID_HANDLE_VALUE) {
|
||||
TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
|
||||
fcb->file_number);
|
||||
records_read = 0;
|
||||
AL_result = 0x01; /* end of file, no data read */
|
||||
} else {
|
||||
position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
|
||||
if (position != record_number * fcb->logical_record_size) {
|
||||
TRACE("seek(%d, %ld, 0) failed with %ld\n",
|
||||
fcb->file_number, record_number * fcb->logical_record_size, position);
|
||||
records_read = 0;
|
||||
AL_result = 0x01; /* end of file, no data read */
|
||||
} else {
|
||||
disk_transfer_area = GetCurrentDTA(context);
|
||||
records_requested = CX_reg(context);
|
||||
bytes_requested = (UINT) records_requested * fcb->logical_record_size;
|
||||
bytes_read = _lread((HFILE) handle, disk_transfer_area, bytes_requested);
|
||||
if (bytes_read != bytes_requested) {
|
||||
TRACE("_lread(%d, %p, %d) failed with %d\n",
|
||||
fcb->file_number, disk_transfer_area, bytes_requested, bytes_read);
|
||||
records_read = bytes_read / fcb->logical_record_size;
|
||||
if (bytes_read % fcb->logical_record_size == 0) {
|
||||
AL_result = 0x01; /* end of file, no data read */
|
||||
} else {
|
||||
records_read++;
|
||||
memset(&disk_transfer_area[bytes_read], 0, records_read * fcb->logical_record_size - bytes_read);
|
||||
AL_result = 0x03; /* end of file, partial record read */
|
||||
} /* if */
|
||||
} else {
|
||||
TRACE("successful read %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
|
||||
bytes_read, record_number, position, fcb->file_number, handle);
|
||||
records_read = records_requested;
|
||||
AL_result = 0x00; /* successful */
|
||||
} /* if */
|
||||
} /* if */
|
||||
} /* if */
|
||||
record_number += records_read;
|
||||
memcpy(fcb->random_access_record_number, &record_number, 4);
|
||||
fcb->current_block_number = record_number / 128;
|
||||
fcb->record_within_current_block = record_number % 128;
|
||||
SET_CX(context, records_read);
|
||||
SET_AL(context, AL_result);
|
||||
}
|
||||
|
||||
|
||||
/***********************************************************************
|
||||
* INT21_RandomBlockWriteToFCB
|
||||
*
|
||||
* Handler for function 0x28.
|
||||
*
|
||||
* PARAMS
|
||||
* CX [I/O] Number of records to write
|
||||
* DX:DX [I/O] File control block (FCB or XFCB) of open file
|
||||
*
|
||||
* RETURNS (in AL)
|
||||
* 0: successful
|
||||
* 1: disk full
|
||||
* 2: segment wrap in DTA (not returned now)
|
||||
*
|
||||
* NOTES
|
||||
* Writes several records with the size FCB->logical_record_size from
|
||||
* the disk transfer area to the FCB. The number of records to be
|
||||
* written is specified in the CX register. The position of the first
|
||||
* record is specified with FCB->random_access_record_number. The
|
||||
* FCB->random_access_record_number, the FCB->current_block_number
|
||||
* and FCB->record_within_current_block are updated to point to the
|
||||
* next record after the records written. The CX register is set to
|
||||
* the number of successfully written records.
|
||||
*/
|
||||
static void INT21_RandomBlockWriteToFCB( CONTEXT86 *context )
|
||||
{
|
||||
struct FCB *fcb;
|
||||
struct XFCB *xfcb;
|
||||
HANDLE handle;
|
||||
DWORD record_number;
|
||||
long position;
|
||||
BYTE *disk_transfer_area;
|
||||
UINT records_requested;
|
||||
UINT bytes_requested;
|
||||
UINT bytes_written;
|
||||
UINT records_written;
|
||||
BYTE AL_result;
|
||||
|
||||
fcb = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
|
||||
if (fcb->drive_number == 0xff) {
|
||||
xfcb = (struct XFCB *) fcb;
|
||||
fcb = (struct FCB *) xfcb->fcb;
|
||||
} /* if */
|
||||
|
||||
memcpy(&record_number, fcb->random_access_record_number, 4);
|
||||
handle = DosFileHandleToWin32Handle((HFILE16) fcb->file_number);
|
||||
if (handle == INVALID_HANDLE_VALUE) {
|
||||
TRACE("DosFileHandleToWin32Handle(%d) failed: INVALID_HANDLE_VALUE\n",
|
||||
fcb->file_number);
|
||||
records_written = 0;
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
position = SetFilePointer(handle, record_number * fcb->logical_record_size, NULL, 0);
|
||||
if (position != record_number * fcb->logical_record_size) {
|
||||
TRACE("seek(%d, %ld, 0) failed with %ld\n",
|
||||
fcb->file_number, record_number * fcb->logical_record_size, position);
|
||||
records_written = 0;
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
disk_transfer_area = GetCurrentDTA(context);
|
||||
records_requested = CX_reg(context);
|
||||
bytes_requested = (UINT) records_requested * fcb->logical_record_size;
|
||||
bytes_written = _lwrite((HFILE) handle, disk_transfer_area, bytes_requested);
|
||||
if (bytes_written != bytes_requested) {
|
||||
TRACE("_lwrite(%d, %p, %d) failed with %d\n",
|
||||
fcb->file_number, disk_transfer_area, bytes_requested, bytes_written);
|
||||
records_written = bytes_written / fcb->logical_record_size;
|
||||
AL_result = 0x01; /* disk full */
|
||||
} else {
|
||||
TRACE("successful write %d bytes from record %ld (position %ld) of file %d (handle %p)\n",
|
||||
bytes_written, record_number, position, fcb->file_number, handle);
|
||||
records_written = records_requested;
|
||||
AL_result = 0x00; /* successful */
|
||||
} /* if */
|
||||
} /* if */
|
||||
} /* if */
|
||||
record_number += records_written;
|
||||
memcpy(fcb->random_access_record_number, &record_number, 4);
|
||||
fcb->current_block_number = record_number / 128;
|
||||
fcb->record_within_current_block = record_number % 128;
|
||||
SET_CX(context, records_written);
|
||||
SET_AL(context, AL_result);
|
||||
}
|
||||
|
||||
|
||||
/***********************************************************************
|
||||
* INT21_CreateDirectory
|
||||
*
|
||||
|
|
@ -1461,8 +2127,11 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
|
|||
break;
|
||||
|
||||
case 0x0f: /* OPEN FILE USING FCB */
|
||||
INT21_OpenFileUsingFCB( context );
|
||||
break;
|
||||
|
||||
case 0x10: /* CLOSE FILE USING FCB */
|
||||
INT_BARF( context, 0x21 );
|
||||
INT21_CloseFileUsingFCB( context );
|
||||
break;
|
||||
|
||||
case 0x11: /* FIND FIRST MATCHING FILE USING FCB */
|
||||
|
|
@ -1471,8 +2140,17 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
|
|||
break;
|
||||
|
||||
case 0x13: /* DELETE FILE USING FCB */
|
||||
INT_BARF( context, 0x21 );
|
||||
break;
|
||||
|
||||
case 0x14: /* SEQUENTIAL READ FROM FCB FILE */
|
||||
INT21_SequenialReadFromFCB( context );
|
||||
break;
|
||||
|
||||
case 0x15: /* SEQUENTIAL WRITE TO FCB FILE */
|
||||
INT21_SequenialWriteToFCB( context );
|
||||
break;
|
||||
|
||||
case 0x16: /* CREATE OR TRUNCATE FILE USING FCB */
|
||||
case 0x17: /* RENAME FILE USING FCB */
|
||||
INT_BARF( context, 0x21 );
|
||||
|
|
@ -1514,7 +2192,13 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
|
|||
break;
|
||||
|
||||
case 0x21: /* READ RANDOM RECORD FROM FCB FILE */
|
||||
INT21_ReadRandomRecordFromFCB( context );
|
||||
break;
|
||||
|
||||
case 0x22: /* WRITE RANDOM RECORD TO FCB FILE */
|
||||
INT21_WriteRandomRecordToFCB( context );
|
||||
break;
|
||||
|
||||
case 0x23: /* GET FILE SIZE FOR FCB */
|
||||
case 0x24: /* SET RANDOM RECORD NUMBER FOR FCB */
|
||||
INT_BARF( context, 0x21 );
|
||||
|
|
@ -1532,11 +2216,17 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
|
|||
break;
|
||||
|
||||
case 0x26: /* CREATE NEW PROGRAM SEGMENT PREFIX */
|
||||
case 0x27: /* RANDOM BLOCK READ FROM FCB FILE */
|
||||
case 0x28: /* RANDOM BLOCK WRITE TO FCB FILE */
|
||||
INT_BARF( context, 0x21 );
|
||||
break;
|
||||
|
||||
case 0x27: /* RANDOM BLOCK READ FROM FCB FILE */
|
||||
INT21_RandomBlockReadFromFCB( context );
|
||||
break;
|
||||
|
||||
case 0x28: /* RANDOM BLOCK WRITE TO FCB FILE */
|
||||
INT21_RandomBlockWriteToFCB( context );
|
||||
break;
|
||||
|
||||
case 0x29: /* PARSE FILENAME INTO FCB */
|
||||
INT_Int21Handler( context );
|
||||
break;
|
||||
|
|
|
|||
Loading…
Reference in New Issue