135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
// FILE.C -- Utilities for File handling
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//
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// Copyright (c) 1989, Microsoft Corporation. All rights reserved.
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//
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// Purpose:
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// This module contains routines that help in file handling. These routines
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// have a behaviour which depends upon the Operating System Version.
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//
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// Revision History:
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// 08-Jun-1992 SS Port to DOSX32
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// 20-Apr-1989 SB Created
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//
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// Notes: Created to give OS/2 Version 1.2 filename support.
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#include "precomp.h"
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#pragma hdrstop
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#define bitsin(type) sizeof(type) * 8
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// getFileName -- get file name from struct
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//
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// Purpose: returns filename from file search structure passed to it.
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//
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// Input: findBuf -- address of pointer to structure
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//
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// Output: Returns a pointer to filename in the file search structure.
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//
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// Assumes:
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// That the structure of appropriate size is given to it. This means that the
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// size is as per --
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// find_t : DOS Real Mode
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// _finddata_t : FLAT Protect Mode
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//
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// Notes: The functionality depends upon the OS version and mode
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char *
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getFileName(
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void *findBuf
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)
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{
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char *fileName;
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fileName = ((struct _finddata_t *) findBuf)->name;
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return(fileName);
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}
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// getDateTime -- get file timestamp from struct
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//
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// Purpose: returns timestamp from the file search structure passed to it.
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//
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// Input: findBuf -- address of pointer to structure
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//
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// Output: Returns timestamp of the file in the structure
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//
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// Assumes:
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// That the structure of appropriate size is given to it. This means that the
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// size is as per --
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// find_t : DOS Real Mode
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// _finddata_t : FLAT Protect Mode
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//
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// Notes:
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// The timestamp is an unsigned long value that gives the date and time of last
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// change to the file. If the date is high byte then two times of creation of
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// two files can be compared by comparing their timestamps. This is easy in the
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// DOS struct but becomes complex for the OS/2 structs because the order of date
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// and time has been reversed (for some unexplicable reason).
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//
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// The functionality depends upon the OS version and mode.
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time_t
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getDateTime(
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const _finddata_t *pfd
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)
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{
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time_t dateTime;
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if( pfd->attrib & _A_SUBDIR ) {
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// subdir return create date
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if (pfd->time_create == -1) {
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// except on FAT
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dateTime = pfd->time_write;
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}
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else {
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dateTime = pfd->time_create;
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}
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}
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else {
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dateTime = pfd->time_write ;
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}
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return dateTime;
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}
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// putDateTime -- change the timestamp in the struct
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//
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// Purpose: changes timestamp in the file search structure passed to it.
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//
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// Input: findBuf -- address of pointer to structure
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// lDateTime -- new value of timestamp
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//
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// Assumes:
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// That the structure of appropriate size is given to it. This means that the
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// size is as per --
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// find_t : DOS Real Mode
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// FileFindBuf : OS/2 (upto Ver 1.10) Protect Mode
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// _FILEFINDBUF : OS/2 (Ver 1.20 & later) Protect Mode
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//
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// Notes:
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// The timestamp is a time_t value that gives the date and time of last
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// change to the file. If the date is high byte then two times of creation of
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// two files can be compared by comparing their timestamps. This is easy in the
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// DOS struct but becomes complex for the OS/2 structs because the order of date
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// and time has been reversed (for some unexplicable reason).
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//
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// The functionality depends upon the OS version and mode.
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//
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// Efficient method to get a long with high and low bytes reversed is
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// (long)high << 16 | (long)low //high, low being short
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void
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putDateTime(
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_finddata_t *pfd,
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time_t lDateTime
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)
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{
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if (pfd->attrib & _A_SUBDIR) {
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// return the creation date on directories
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pfd->time_create = lDateTime;
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}
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else {
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pfd->time_write = lDateTime;
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}
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}
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