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https://github.com/pevans/erc-c.git
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A number of updates in heavy dev phase
1. Add an insert function (to insert a new disk). 2. Add a new shift function to coordinate sector position updates when reading or writing.
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256e0cf1d6
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@ -59,6 +59,46 @@ apple2dd_free(apple2dd *drive)
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free(drive);
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}
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int
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apple2dd_insert(apple2dd *drive, FILE *stream)
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{
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struct stat finfo;
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if (stream == NULL) {
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log_critical("File stream is null");
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return ERR_BADFILE;
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}
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// How large is this data set? Let's get the stat info.
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if (fstat(fileno(stream), &finfo)) {
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log_critical("Couldn't inspect file stream: %s", strerror(errno));
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return ERR_BADFILE;
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}
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if (finfo.st_size != _140K_) {
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log_critical("Unexpected file format (file size = %d)", finfo.st_size);
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return ERR_BADFILE;
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}
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// If we have any data, get rid of it. We'll start fresh here.
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apple2dd_eject(drive);
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drive->data = vm_segment_create(finfo.st_size);
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drive->track_pos = 0;
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drive->sector_pos = 0;
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return OK;
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}
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void
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apple2dd_eject(apple2dd *drive)
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{
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if (drive->data) {
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vm_segment_free(drive->data);
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drive->data = NULL;
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}
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}
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void
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apple2dd_step(apple2dd *drive, int steps)
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{
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@ -115,18 +155,26 @@ apple2dd_position(apple2dd *drive)
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return 0;
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}
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void
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apple2dd_shift(apple2dd *drive, int pos)
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{
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drive->sector_pos += pos;
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if (drive->sector_pos > MAX_SECTOR_POS) {
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// We need to reset the sector pos to zero, because...
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drive->sector_pos = 0;
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// We also need to move to the next track, so let's adjust by
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// two half-tracks.
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apple2dd_step(drive, 2);
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}
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}
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vm_8bit
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apple2dd_read_byte(apple2dd *drive)
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{
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vm_8bit byte = vm_segment_get(drive->data, apple2dd_position(drive));
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// We may have read the very last byte in a sector; if so let's
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// adjust the track_pos by two half tracks and reset the sector pos.
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drive->sector_pos++;
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if (drive->sector_pos > MAX_SECTOR_POS) {
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drive->track_pos += 2;
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drive->sector_pos = 0;
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}
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apple2dd_shift(drive, 1);
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return byte;
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}
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@ -135,10 +183,5 @@ void
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apple2dd_write(apple2dd *drive, vm_8bit byte)
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{
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vm_segment_set(drive->data, apple2dd_position(drive), byte);
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drive->sector_pos++;
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if (drive->sector_pos > MAX_SECTOR_POS) {
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drive->track_pos += 2;
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drive->sector_pos = 0;
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}
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apple2dd_shift(drive, 1);
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}
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