Texas Instruments TI-89

566
Appendix A: System Routines — Files
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
FGetSize
Declaration:
FSWORD
FGetSize
(FILES *
fsPtr
)
Category(ies):
Files
Description:
Return the number of bytes currently stored in an opened FILE.
Inputs:
fsPtr
— Pointer to FILES structure previously opened with
FOpen
.
Outputs:
Number of bytes in the opened file.
Assumptions:
The FILES structure pointed to by
fsPtr
must have been previously opened
with
FOpen
(either read or write mode).
Side Effects:
None
Availability:
On AMS 2.00 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: FOpen, FSetSize
Example:
FILES f1;
FSWORD x;
if (FS_OK == FOpen("f1", &f1, FM_WRITE, "DAT")) {
FWrite( "START", 5, &f1 );
x = FGetSize( &f1 ); /* x == 5 */
FWrite( "123", 3, &f1 );
x = FGetSize( &f1 ); /* x == 8 */
FSetSize( &f1, 7 ); /* truncate file */
x = FGetSize( &f1 ); /* x == 7 */
FClose(&f1);
}