[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | blkwr.c -- write a block of 0..32767 sectors
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| 4 | Version 14 -- 1987-12-15 -- D.N. Lynx Crowe
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| 5 |
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| 6 | int
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| 7 | blkwr(fcp, buf, ns)
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| 8 | struct fcb *fcp;
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| 9 | char *buf;
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| 10 | int ns;
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| 11 |
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| 12 | Writes 'ns' sectors from file 'fcp' into 'buf'.
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| 13 | Returns the number of unwritten sectors,
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| 14 | or 0 if all were written.
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| 15 | =============================================================================
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| 16 | */
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| 17 |
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| 18 | #define DEBUGIT 0
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| 19 |
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| 20 | #include "stddefs.h"
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| 21 | #include "biosdefs.h"
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| 22 | #include "errno.h"
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| 23 | #include "errdefs.h"
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| 24 | #include "fspars.h"
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| 25 |
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[0580615] | 26 | extern int _nsic(struct fcb *fcp, struct bpb *bpp, char *fp);
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| 27 | extern int _alcnew(struct fcb *fcp);
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| 28 | extern int _newcls(void);
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[f40a309] | 29 |
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| 30 | extern long _berrno; /* last file system bios error number */
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| 31 |
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| 32 | extern struct bpb *_thebpb; /* current bios parameter block */
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| 33 |
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| 34 | extern short _thefat[]; /* current file allocation table */
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| 35 |
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| 36 | extern short _fatmod; /* FAT modified flag */
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| 37 |
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| 38 | #if DEBUGIT
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| 39 | extern short fsdebug;
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| 40 | #endif
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| 41 |
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| 42 | #if TBUFFER
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| 43 |
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| 44 | /* WARNING: this ONLY works for 512 byte sectors, 9 sectors per track */
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| 45 |
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| 46 | extern short _b_tbuf[9][256]; /* the track buffer */
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| 47 |
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| 48 | extern short _b_trak; /* current track */
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| 49 | extern short _b_side; /* current side */
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| 50 | extern short _b_sect; /* current sector */
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| 51 | extern short _b_tsec; /* base sector for current track */
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| 52 |
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| 53 | #endif
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| 54 |
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| 55 | /* |
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| 56 |
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| 57 | */
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| 58 |
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| 59 | #if TBUFFER
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| 60 |
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| 61 | /*
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| 62 | =============================================================================
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| 63 | _secwr(buf, rec) -- write a logical sector into the track buffer
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| 64 | =============================================================================
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| 65 | */
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[0580615] | 66 |
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[f40a309] | 67 | long _secwr(char *buf, short rec)
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| 68 | {
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| 69 | register short track, side, sector;
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| 70 |
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| 71 | if (_thebpb->dspt NE 9) /* make sure we can do this */
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| 72 | return(ERR07);
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| 73 |
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| 74 | if (_thebpb->recsiz NE 512)
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| 75 | return(ERR07);
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| 76 |
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| 77 | track = rec / _thebpb->dspc; /* desired track */
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| 78 | sector = rec - (track * _thebpb->dspc); /* logical sector */
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| 79 |
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| 80 | if (sector GE _thebpb->dspt) { /* adjust sector and side */
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| 81 |
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| 82 | sector -= _thebpb->dspt;
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| 83 | side = 1;
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| 84 |
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| 85 | } else {
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| 86 |
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| 87 | side = 0;
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| 88 | }
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| 89 |
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| 90 | #if DEBUGIT
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| 91 | if (fsdebug) {
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| 92 |
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| 93 | printf("_secwr($%08.8LX, %d): track=%d, side=%d, sector=%d\n",
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| 94 | buf, rec, track, side, sector);
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| 95 | printf("_secwr(): _b_trak=%d, _b_side=%d, _b_sect=%d, _b_tsec=%d\n",
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| 96 | _b_trak, _b_side, _b_sect, _b_tsec);
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| 97 | }
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| 98 | #endif
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| 99 |
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| 100 | if ((track NE _b_trak) OR (side NE _b_side)) /* track in buffer ? */
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| 101 | return(0L);
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| 102 |
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| 103 | memcpy((char *)_b_tbuf[sector], buf, 512); /* update the buffer */
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| 104 |
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| 105 | #if DEBUGIT
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| 106 | if (fsdebug)
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| 107 | printf("_secwr(): updated track buffer\n");
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| 108 | #endif
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| 109 |
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| 110 | return(0L);
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| 111 | }
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| 112 |
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| 113 | #endif
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| 114 |
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| 115 | /* |
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| 116 |
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| 117 | */
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| 118 |
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| 119 | /*
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| 120 | =============================================================================
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| 121 | blkwr(fcp, buf, ns) -- write 'ns' sectors from file 'fcp' into 'buf'.
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| 122 | Returns the number of unwritten sectors, or 0 if all were written.
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| 123 | =============================================================================
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[0580615] | 124 | */
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[f40a309] | 125 |
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| 126 | int blkwr(struct fcb *fcp, char *buf, int ns)
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| 127 | {
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| 128 | long rc;
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| 129 | short clustr;
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| 130 |
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| 131 | while (ns > 0) { /* write a sector at a time */
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| 132 |
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| 133 | if (fcp->asects) {
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| 134 |
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| 135 | if (fcp->curlsn LT fcp->asects) {
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| 136 |
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| 137 | #if DEBUGIT
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| 138 | if (fsdebug)
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| 139 | printf("blkwr(): [1] ns=%d, curlsn=%ld, curdsn=%ld, curcls=%u, buf=$%08lX\n",
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| 140 | ns, fcp->curlsn, fcp->curdsn, fcp->curcls, buf);
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| 141 | #endif
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| 142 |
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| 143 | if (rc = BIOS(B_RDWR, 1, buf, 1, (short)fcp->curdsn, 0)) {
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| 144 |
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| 145 | #if DEBUGIT
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| 146 | if (fsdebug)
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| 147 | printf("blkwr(): B_RDWR failed, rc=%ld\n", rc);
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| 148 | #endif
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| 149 |
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| 150 | _berrno = rc; /* log the error */
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| 151 | errno = EIO;
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| 152 | return(ns); /* return unwritten sector count */
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| 153 | }
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| 154 |
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| 155 | #if TBUFFER
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| 156 | _secwr(buf, (short)fcp->curdsn);
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| 157 | #endif
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| 158 |
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| 159 | rc = _nsic(fcp, _thebpb, _thefat);
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| 160 |
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| 161 | #if DEBUGIT
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| 162 | if (fsdebug)
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| 163 | printf("blkwr(): _nsic() rc=%ld\n", rc);
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| 164 | #endif
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| 165 |
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| 166 | if (--ns EQ 0) /* done if no more to do */
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| 167 | return(0);
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| 168 |
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| 169 | if (rc < 0) { /* bad cluster ? */
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| 170 |
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| 171 | errno = EIO; /* set error number */
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| 172 | return(ns); /* return unwritten sector count */
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| 173 | }
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| 174 |
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| 175 | buf += _thebpb->recsiz;
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| 176 | /* |
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| 177 |
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| 178 | */
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| 179 | } else if (fcp->curlsn EQ fcp->asects) {
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| 180 |
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| 181 | if (_alcnew(fcp)) { /* allocate a cluster */
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| 182 |
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| 183 | errno = EIO; /* set error number */
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| 184 | return(ns); /* return unwritten sector count */
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| 185 | }
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| 186 |
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| 187 | fcp->modefl &= ~FC_EOF; /* clear EOF flag */
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| 188 |
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| 189 | #if DEBUGIT
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| 190 | if (fsdebug)
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| 191 | printf("blkwr(): [2] ns=%d, curlsn=%ld, curdsn=%ld, curcls=%u, buf=$%08lX\n",
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| 192 | ns, fcp->curlsn, fcp->curdsn, fcp->curcls, buf);
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| 193 | #endif
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| 194 |
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| 195 | if (rc = BIOS(B_RDWR, 1, buf, 1, (short)fcp->curdsn, 0)) {
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| 196 |
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| 197 | #if DEBUGIT
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| 198 | if (fsdebug)
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| 199 | printf("blkwr(): B_RDWR failed, rc=%ld\n", rc);
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| 200 | #endif
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| 201 |
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| 202 | _berrno = rc; /* log the error */
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| 203 | errno = EIO;
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| 204 | return(ns); /* return unwritten sector count */
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| 205 | }
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| 206 |
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| 207 | #if TBUFFER
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| 208 | _secwr(buf, (short)fcp->curdsn);
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| 209 | #endif
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| 210 |
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| 211 | ++fcp->curlsn;
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| 212 | ++fcp->clsec;
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| 213 | ++fcp->curdsn;
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| 214 |
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| 215 | if (--ns EQ 0)
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| 216 | return(0);
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| 217 |
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| 218 | buf += _thebpb->recsiz; /* advance buffer pointer */
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| 219 | }
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| 220 | /* |
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| 221 |
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| 222 | */
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| 223 | } else {
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| 224 |
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| 225 | if (0 EQ (clustr = _newcls())) {
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| 226 |
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| 227 | errno = EIO;
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| 228 | return(ns);
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| 229 | }
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| 230 |
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| 231 | fcp->de.bclust = micons(clustr);
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| 232 | _ptcl12(_thefat, clustr, 0x0FF8);
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| 233 | _fatmod = TRUE;
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| 234 | fcp->curdsn = _cl2lsn(_thebpb, clustr);
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| 235 | fcp->curcls = clustr;
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| 236 | fcp->clsec = 0;
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| 237 | fcp->asects = _thebpb->clsiz;
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| 238 | fcp->modefl &= ~FC_EOF;
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| 239 |
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| 240 | fcp->modefl &= ~FC_EOF; /* clear EOF flag */
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| 241 |
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| 242 | #if DEBUGIT
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| 243 | if (fsdebug)
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| 244 | printf("blkwr(): [3] ns=%d, curlsn=%ld, curdsn=%ld, curcls=%u, buf=$%08lX\n",
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| 245 | ns, fcp->curlsn, fcp->curdsn, fcp->curcls, buf);
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| 246 | #endif
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| 247 |
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| 248 | if (rc = BIOS(B_RDWR, 1, buf, 1, (short)fcp->curdsn, 0)) {
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| 249 |
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| 250 | #if DEBUGIT
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| 251 | if (fsdebug)
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| 252 | printf("blkwr(): B_RDWR failed, rc=%ld\n", rc);
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| 253 | #endif
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| 254 |
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| 255 | _berrno = rc; /* log the error */
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| 256 | errno = EIO;
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| 257 | return(ns); /* return unwritten sector count */
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| 258 | }
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| 259 |
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| 260 | #if TBUFFER
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| 261 | _secwr(buf, (short)fcp->curdsn);
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| 262 | #endif
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| 263 |
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| 264 | ++fcp->curlsn;
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| 265 | ++fcp->clsec;
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| 266 | ++fcp->curdsn;
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| 267 |
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| 268 | if (--ns EQ 0)
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| 269 | return(0);
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| 270 |
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| 271 | buf += _thebpb->recsiz; /* advance buffer pointer */
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| 272 | }
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| 273 | }
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| 274 |
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| 275 | return(ns); /* return (will be zero or negative) */
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| 276 | }
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