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CHMOD2.C
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─────Run-Time Library───────────────────────────────────────────────────────
/* CHMOD2.C illustrates reading and changing file attributes and file
* time using functions:
* _dos_getftime _dos_setftime (DOS-only)
* _dos_getfileattr _dos_setfileattr
*
* See CHMOD1.C for a simpler variation of this program using the _utime,
* _access, and _chmod functions.
*/
#include <dos.h>
#include <fcntl.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <sys\types.h>
#include <sys\stat.h>
char *datestr( unsigned d, char *buf ); /* Prototypes */
char *timestr( unsigned t, char *buf );
void main( int argc, char *argv[] )
{
unsigned fdate, ftime, fattr;
struct _dosdate_t ddate;
struct _dostime_t dtime;
int hsource;
char timebuf[10], datebuf[10], *pkind;
/* Open to get handle and test for errors (such as nonexistence). */
if( _dos_open( argv[1], _O_RDONLY, &hsource ) )
{
printf( "Can't open\n" );
exit( 1 );
}
/* Get time, date, and attribute of file. */
_dos_getftime( hsource, &fdate, &ftime );
_dos_getfileattr( argv[1], &fattr );
/* Convert information into formatted strings. */
datestr( fdate, datebuf );
timestr( ftime, timebuf );
printf( "%-12s %-8s %-9s %-9s %s %s %s\n",
"FILE", "TIME", "DATE", "KIND", "RDO", "HID", "SYS" );
printf( "%-12s %8s %8s %-9s %c %c %c\n",
argv[1], timebuf, datebuf, pkind,
(fattr & _A_RDONLY) ? 'Y' : 'N',
(fattr & _A_HIDDEN) ? 'Y' : 'N',
(fattr & _A_SYSTEM) ? 'Y' : 'N' );
/* Update file time or attribute. */
printf( "Change: (T)ime (R)ead only (H)idden (S)ystem\n" );
switch( toupper( _getch() ) ) /* Use stdlib.h, not ctype.h */
{
case 'T': /* Set to current time */
_dos_gettime( &dtime );
_dos_getdate( &ddate );
ftime = (dtime.hour << 11) | (dtime.minute << 5);
fdate = ((ddate.year - 1980) << 9) | (ddate.month << 5) |
ddate.day;
_dos_setftime( hsource, fdate, ftime );
break;
case 'R': /* Toggle read only */
_dos_setfileattr( argv[1], fattr ^ _A_RDONLY );
break;
case 'H': /* Toggle hidden */
_dos_setfileattr( argv[1], fattr ^ _A_HIDDEN );
break;
case 'S': /* Toggle system */
_dos_setfileattr( argv[1], fattr ^ _A_SYSTEM );
break;
}
_dos_close( hsource );
exit( 1 );
}
/* Takes unsigned time in the format: fedcba9876543210
* s=2 sec incr, m=0-59, h=23 hhhhhmmmmmmsssss
* Changes to a 9-byte string (ignore seconds): hh:mm ?m
*/
char *timestr( unsigned t, char *buf )
{
int h = (t >> 11) & 0x1f, m = (t >> 5) & 0x3f;
sprintf( buf, "%2.2d:%02.2d %cm", h % 12, m, h > 11 ? 'p' : 'a' );
return buf;
}
/* Takes unsigned date in the format: fedcba9876543210
* d=1-31, m=1-12, y=0-119 (1980-2099) yyyyyyymmmmddddd
* Changes to a 9-byte string: mm/dd/yy
*/
char *datestr( unsigned d, char *buf )
{
sprintf( buf, "%2.2d/%02.2d/%02.2d",
(d >> 5) & 0x0f, d & 0x1f, (d >> 9) + 80 );
return buf;
}
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