| 1 | /*!
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| 2 | \file write_block.c
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| 3 | \ingroup (PSIO)
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| 4 | */
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| 5 |
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| 6 | #include <stdlib.h>
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| 7 | #include <string.h>
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| 8 | #include <util/psi3/libpsio/psio.h>
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| 9 |
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| 10 | namespace psi3 {
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| 11 | namespace libpsio {
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| 12 |
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| 13 | /*!
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| 14 | ** PSIO_WRITE_BLOCK():
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| 15 | **
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| 16 | ** \ingroup (PSIO)
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| 17 | */
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| 18 |
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| 19 | int psio_write_block(unsigned int unit, char *key, char *buffer, ULI blksiz,
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| 20 | ULI start_blk, ULI end_blk)
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| 21 | {
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| 22 | ULI size, shift;
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| 23 | psio_ud *this_unit;
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| 24 | psio_tocentry *this_entry, *last_entry;
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| 25 | psio_address sadd, eadd;
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| 26 |
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| 27 | this_unit = &(psio_unit[unit]);
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| 28 |
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| 29 | /* Find the entry in the TOC */
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| 30 | this_entry = psio_tocscan(unit, key);
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| 31 |
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| 32 | if(this_entry == NULL) { /* New TOC entry */
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| 33 | if(start_blk) psio_error(unit,PSIO_ERROR_BLKSTART);
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| 34 |
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| 35 | this_entry = (psio_tocentry *) malloc(sizeof(psio_tocentry));
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| 36 | strcpy(this_entry->key,key);
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| 37 | this_entry->next = NULL;
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| 38 | this_entry->last = NULL;
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| 39 |
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| 40 | /* Compute the address of the entry */
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| 41 | if(!(this_unit->toclen)) { /* First TOC entry */
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| 42 | this_entry->sadd.page = 0;
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| 43 | this_entry->sadd.offset = 3*sizeof(ULI);
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| 44 |
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| 45 | this_unit->toc = this_entry;
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| 46 | }
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| 47 | else { /* Use ending address from last TOC entry */
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| 48 | last_entry = psio_toclast(unit);
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| 49 | this_entry->sadd = last_entry->eadd;
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| 50 |
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| 51 | last_entry->next = this_entry;
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| 52 | this_entry->last = last_entry;
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| 53 | }
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| 54 |
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| 55 | /* Data for the write call */
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| 56 | size = (end_blk - start_blk + 1)*blksiz;
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| 57 | sadd = this_entry->sadd;
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| 58 |
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| 59 | /* Set end address for this_entry */
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| 60 | this_entry->eadd = psio_get_address(this_entry->sadd, size);
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| 61 |
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| 62 | /* Update the unit's TOC stats */
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| 63 | this_unit->toclen++;
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| 64 | this_unit->tocaddress = this_entry->eadd;
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| 65 | }
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| 66 | else { /* Old TOC entry */
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| 67 |
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| 68 | size = (end_blk - start_blk + 1) * blksiz; /* The total buffer size */
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| 69 | shift = start_blk * blksiz; /* Number of bytes to shift from start */
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| 70 |
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| 71 | /* Compute the starting page and offset for the block */
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| 72 | sadd = psio_get_address(this_entry->sadd, shift);
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| 73 |
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| 74 | /* Make sure this block doesn't start past the end of the entry */
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| 75 | if(sadd.page > this_entry->eadd.page)
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| 76 | psio_error(unit,PSIO_ERROR_BLKSTART);
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| 77 | else if((sadd.page == this_entry->eadd.page) &&
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| 78 | (sadd.offset > this_entry->eadd.offset))
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| 79 | psio_error(unit,PSIO_ERROR_BLKSTART);
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| 80 |
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| 81 | /* Compute the new ending address for the entry, if necessary */
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| 82 | eadd = psio_get_address(sadd, size);
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| 83 | if(eadd.page > this_entry->eadd.page) {
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| 84 | this_entry->eadd = this_unit->tocaddress = eadd;
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| 85 | }
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| 86 | else if((eadd.page == this_entry->eadd.page) &&
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| 87 | (eadd.offset > this_entry->eadd.offset))
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| 88 | {
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| 89 | this_entry->eadd = eadd;
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| 90 | this_unit->tocaddress = eadd;
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | /* Now write the actual data to the unit */
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| 95 | psio_rw(unit, buffer, sadd, size, 1);
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| 96 |
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| 97 | return(0);
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| 98 | }
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| 99 |
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| 100 | }
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| 101 | }
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