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tape: implement locate_file without LOCATE(10)

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This commit is contained in:
Dietmar Maurer
2021-04-07 16:16:55 +02:00
parent 566b946f9b
commit 5d6379f8db
3 changed files with 45 additions and 38 deletions
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20
src/bin/pmt.rs
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@ -36,6 +36,12 @@ pub const FILE_MARK_COUNT_SCHEMA: Schema =
.maximum(i32::MAX as isize)
.schema();
pub const FILE_MARK_POSITION_SCHEMA: Schema =
IntegerSchema::new("File mark position (0 is BOT).")
.minimum(0)
.maximum(i32::MAX as isize)
.schema();
pub const RECORD_COUNT_SCHEMA: Schema =
IntegerSchema::new("Record count.")
.minimum(1)
@ -128,22 +134,18 @@ fn get_tape_handle(param: &Value) -> Result<LtoTapeHandle, Error> {
optional: true,
},
count: {
schema: FILE_MARK_COUNT_SCHEMA,
schema: FILE_MARK_POSITION_SCHEMA,
},
},
},
)]
/// Position the tape at the beginning of the count file.
///
/// Positioning is done by first rewinding the tape and then spacing
/// forward over count file marks.
fn asf(count: usize, param: Value) -> Result<(), Error> {
/// Position the tape at the beginning of the count file (after
/// filemark count)
fn asf(count: u64, param: Value) -> Result<(), Error> {
let mut handle = get_tape_handle(&param)?;
handle.rewind()?;
handle.forward_space_count_files(count)?;
handle.locate_file(count)?;
Ok(())
}