[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | filesys.c -- file system support functions
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| 4 | Version 44 -- 1987-11-15 -- D.N. Lynx Crowe
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| 5 |
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| 6 | These functions support a {MS,GEM}DOS|TOS-like file system.
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| 7 | Only 12 bit FAT entries are supported.
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| 8 | Subdirectories are not supported in this version.
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| 9 | =============================================================================
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| 10 | */
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| 11 |
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| 12 | #define DEBUGIT 0
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| 13 |
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[b28a12e] | 14 | #include "ram.h"
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[f40a309] | 15 |
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| 16 | #define FAT_EOF 0x0FF8
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| 17 |
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| 18 | #define IO_ERR -1
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| 19 | #define IO_OK 0
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| 20 | #define IO_EOF 1
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| 21 |
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| 22 | #define DE_NULL ((struct dirent *)0L)
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| 23 |
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| 24 | #if DEBUGIT
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| 25 | short fsdebug;
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| 26 | #endif
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| 27 |
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| 28 | struct bpb *_thebpb; /* BIOS parameter block pointer */
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| 29 | struct dirent _thedir[MAXDIRNT]; /* directory */
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| 30 | struct dirent *_dptr; /* internal directory pointer */
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| 31 |
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[7258c6a] | 32 | uint16_t _thefat[MAXFAT * WDPSEC]; /* file allocation table */
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[f40a309] | 33 |
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[7258c6a] | 34 | int16_t _fatin; /* FAT has been read */
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| 35 | int16_t _dirin; /* directory has been read */
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| 36 | int16_t _bpbin; /* BPB has been read */
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| 37 | int16_t _fatmod; /* FAT modified flag */
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| 38 | int16_t _dirmod; /* directory modified flag */
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[f40a309] | 39 |
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[7258c6a] | 40 | int32_t _berrno; /* BIOS error number */
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[f40a309] | 41 |
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| 42 | /*
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| 43 | =============================================================================
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| 44 | _cl2lsn(bpp, clnum) -- return logical sector number for cluster 'clnum'
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| 45 | using BPB pointed to by 'bpp'
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| 46 | =============================================================================
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| 47 | */
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| 48 |
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[7258c6a] | 49 | uint16_t _cl2lsn(struct bpb *bpp, uint16_t clnum)
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[f40a309] | 50 | {
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| 51 | return(bpp->datrec + (bpp->clsiz * (clnum - 2)) );
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| 52 | }
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| 53 |
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| 54 | /*
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| 55 | =============================================================================
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| 56 | _gtcl12(fat, cl) -- return 12 bit cluster entry 'cl' from FAT pointed
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| 57 | to by 'fat'
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| 58 | =============================================================================
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| 59 | */
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| 60 |
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[7258c6a] | 61 | uint16_t _gtcl12(int8_t *fat, uint16_t cl)
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[f40a309] | 62 | {
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[7258c6a] | 63 | register uint16_t cla, clt;
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[f40a309] | 64 |
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| 65 | cla = cl + (cl >> 1);
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[7258c6a] | 66 | clt = ((uint16_t)0xFF00 & (fat[cla+1] << 8))
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| 67 | | ((uint16_t)0x00FF & fat[cla]);
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[f40a309] | 68 |
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| 69 | if (cl & 1)
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| 70 | clt >>= 4;
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| 71 |
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[7258c6a] | 72 | clt &= (uint16_t)0x0FFF;
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[f40a309] | 73 | return(clt);
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| 74 | }
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| 75 |
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| 76 | /*
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| 77 | =============================================================================
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| 78 | _getfat(bufad, bpp, nfat) -- get FAT 'nfat' into buffer
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| 79 | pointed to by 'bufad' using BPB pointed to by 'bpp'
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| 80 | =============================================================================
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| 81 | */
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| 82 |
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[33b5477] | 83 | uint16_t _getfat(uint16_t *bufad, struct bpb *bpp, uint16_t nfat)
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[f40a309] | 84 | {
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[7258c6a] | 85 | uint16_t fatsec;
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[f40a309] | 86 |
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| 87 | fatsec = nfat ? bpp->fatrec : (bpp->fatrec - bpp->fsiz);
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[7258c6a] | 88 | return(BIOS(B_RDWR, 0, (int8_t *)bufad, bpp->fsiz, fatsec, 0));
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[f40a309] | 89 | }
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| 90 |
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| 91 | /*
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| 92 | =============================================================================
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| 93 | _rdfat(bufad, bpp) -- read FAT into buffer pointed to by 'bufad'
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| 94 | using BPB pointed to by 'bpp'
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| 95 | =============================================================================
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| 96 | */
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| 97 |
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[7258c6a] | 98 | int16_t _rdfat(uint16_t *bufad, struct bpb *bpp)
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[f40a309] | 99 | {
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| 100 | if (_getfat(bufad, bpp, 0)) {
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| 101 |
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| 102 | if (_getfat(bufad, bpp, 1))
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| 103 | return(IO_ERR); /* couldn't read either FAT */
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| 104 | else
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| 105 | return(1); /* secondary FAT read OK */
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| 106 |
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| 107 | } else
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| 108 | return(0); /* main FAT read OK */
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| 109 | }
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| 110 |
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| 111 | /*
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| 112 | =============================================================================
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| 113 | _rdroot(buf, bpp) -- read root directory into buffer
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| 114 | pointed to by 'buf' using BPB pointed to by 'bpp'
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| 115 | =============================================================================
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| 116 | */
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| 117 |
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[7258c6a] | 118 | int16_t _rdroot(uint16_t *buf, struct bpb *bpp)
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[f40a309] | 119 | {
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[7258c6a] | 120 | return(BIOS(B_RDWR, 0, (int8_t *)buf, bpp->rdlen,
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[f40a309] | 121 | (bpp->fatrec + bpp->fsiz), 0));
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | =============================================================================
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| 126 | _nsic(fcp, bpp, fp) -- get the next sector in the file controlled
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| 127 | by the FCB at 'fcp', using the BPB pointed to by 'bpp' and
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| 128 | the FAT pointed to by 'fp'. Returns 0 if successful, or -1 on error,
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| 129 | or 1 on EOF;
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| 130 | =============================================================================
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| 131 | */
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| 132 |
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[7258c6a] | 133 | int16_t _nsic(struct fcb *fcp, struct bpb *bpp, int8_t *fp)
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[f40a309] | 134 | {
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[7258c6a] | 135 | register uint16_t tfe;
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[f40a309] | 136 |
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| 137 | /* check the FCB flags */
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| 138 |
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| 139 | if (!(fcp->modefl & FC_OPN)) {
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| 140 |
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| 141 | errno = EINVAL; /* not open */
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| 142 | return(IO_ERR);
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| 143 | }
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| 144 |
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| 145 | if (fcp->modefl & FC_BAD) {
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| 146 |
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| 147 | errno = EIO; /* previous I/O error */
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| 148 | return(IO_ERR);
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| 149 | }
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| 150 |
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| 151 | if (fcp->de.bclust EQ 0) { /* no sectors allocated (empty file) */
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| 152 |
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| 153 | fcp->modefl |= FC_EOF;
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| 154 | return(IO_EOF);
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| 155 | }
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[fa38804] | 156 |
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[f40a309] | 157 | /* update clsec and curlsn and see if we need a new cluster */
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| 158 |
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| 159 | ++fcp->curlsn;
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| 160 |
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| 161 | if (++fcp->clsec GE bpp->clsiz) {
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| 162 |
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| 163 | /* new cluster needed -- follow the chain */
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| 164 |
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| 165 | fcp->clsec = 0;
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| 166 | tfe = _gtcl12(fp, fcp->curcls);
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| 167 |
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| 168 | if (tfe < 0x0FF0) { /* see if we've got a good cluster */
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| 169 |
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| 170 |
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| 171 | fcp->curcls = tfe; /* good cluster, update fcb */
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| 172 | fcp->curdsn = _cl2lsn(bpp, tfe);
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| 173 |
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| 174 | #if DEBUGIT
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| 175 | if (fsdebug)
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| 176 | printf("_nsic(): NXT curlsn=%ld, curcls=%u, curdsn=%ld\n",
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| 177 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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| 178 | #endif
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| 179 |
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| 180 | return(IO_OK);
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| 181 | }
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| 182 |
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| 183 | if (tfe < 0x0FF8) { /* see if it's a bad cluster */
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| 184 |
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| 185 | fcp-> modefl |= (FC_BAD | FC_EOF); /* bad one */
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| 186 |
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| 187 | #if DEBUGIT
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| 188 | if (fsdebug)
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| 189 | printf("_nsic(): IO_ERR - curlsn=%ld, curcls=%u, curdsn=%ld\n",
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| 190 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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| 191 | #endif
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| 192 |
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| 193 | return(IO_ERR);
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| 194 | }
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| 195 |
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| 196 | fcp->modefl |= FC_EOF; /* EOF hit -- set EOF in FCB */
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| 197 | return(IO_EOF);
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| 198 |
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| 199 | } else {
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| 200 |
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| 201 | ++fcp->curdsn; /* advance to next sector in current cluster */
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| 202 |
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| 203 | #if DEBUGIT
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| 204 | if (fsdebug)
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| 205 | printf("_nsic(): CUR curlsn=%ld, curcls=%u, curdsn=%ld\n",
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| 206 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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| 207 | #endif
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| 208 |
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| 209 | return(IO_OK);
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| 210 | }
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| 211 | }
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| 212 |
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| 213 | /*
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| 214 | =============================================================================
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| 215 | _dsrch(de) -- search for the directory entry pointed to by 'de'
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| 216 | in the current directory
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| 217 | =============================================================================
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| 218 | */
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| 219 |
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[0580615] | 220 | struct dirent *_dsrch(struct dirent *de)
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[f40a309] | 221 | {
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[7258c6a] | 222 | uint16_t i, dl;
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[f40a309] | 223 | register struct dirent *dp;
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| 224 |
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| 225 | dp = _thedir;
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| 226 | dl = _thebpb->rdlen * (_thebpb->recsiz / DENTSIZE);
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| 227 |
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| 228 | for (i = 0; i < dl; i++) { /* check each entry */
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| 229 |
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| 230 | /* see if we've found it */
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| 231 |
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| 232 | if (0 EQ memcmpu(de->fname, dp->fname, 11))
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| 233 | return(dp);
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| 234 |
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| 235 | /* check for end of used entries */
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| 236 |
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| 237 | if ('\0' EQ dp->fname[0])
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| 238 | return(DE_NULL);
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| 239 |
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| 240 | dp++; /* point at next entry to check */
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| 241 | }
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| 242 |
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| 243 | return(DE_NULL);
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| 244 | }
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| 245 |
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| 246 | /*
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| 247 | =============================================================================
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| 248 | _dsnew() -- search for an available directory entry in the current
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| 249 | directory.
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| 250 | =============================================================================
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| 251 | */
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| 252 |
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[0580615] | 253 | struct dirent *_dsnew(void)
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[f40a309] | 254 | {
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[7258c6a] | 255 | uint16_t i, dl;
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[f40a309] | 256 | register struct dirent *dp;
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| 257 |
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| 258 | dp = _thedir;
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| 259 | dl = _thebpb->rdlen * (_thebpb->recsiz / DENTSIZE);
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| 260 |
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| 261 | for (i = 0; i < dl; i++) { /* check each entry */
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| 262 |
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| 263 | /* check for a deleted entry */
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| 264 |
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| 265 | if (0x00E5 EQ (0x00FF & dp->fname[0]))
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| 266 | return(dp);
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| 267 |
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| 268 | /* check for end of used entries */
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| 269 |
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| 270 | if ('\0' EQ dp->fname[0])
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| 271 | return(dp);
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| 272 |
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| 273 | dp++; /* point at next entry to check */
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| 274 | }
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| 275 |
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| 276 | return(DE_NULL); /* couldn't find an available entry */
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| 277 | }
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| 278 |
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| 279 | /*
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| 280 | =============================================================================
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| 281 | _deadio(fcp, err) -- mark the FCB pointed to by 'fcp' as 'in error'
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| 282 | =============================================================================
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| 283 | */
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| 284 |
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[7258c6a] | 285 | void _deadio(struct fcb *fcp, int16_t err)
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[f40a309] | 286 | {
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| 287 | fcp->clsec = 0;
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| 288 | fcp->curcls = 0;
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| 289 | fcp->curlsn = 0L;
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| 290 | fcp->curdsn = 0L;
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| 291 | fcp->curlen = 0L;
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| 292 | fcp->modefl &= ~FC_OPN;
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| 293 | fcp->modefl |= FC_ERR;
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| 294 | errno = err;
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| 295 | }
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| 296 |
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| 297 | /*
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| 298 | =============================================================================
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| 299 | _seek(fcp) -- seek to logical sector number in FCB pointed to by 'fcp'.
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| 300 | Returns: -1 = error; 0 = not at EOF; 1 = soft EOF; 2 = hard EOF.
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| 301 | =============================================================================
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| 302 | */
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| 303 |
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[7258c6a] | 304 | int16_t _seek(struct fcb *fcp)
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[f40a309] | 305 | {
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[7258c6a] | 306 | register uint16_t acls, rcls, nc;
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| 307 | uint16_t sic, spc;
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[f40a309] | 308 |
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| 309 | if (!(fcp->modefl & FC_OPN)) { /* file must be open */
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| 310 |
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| 311 | errno = EINVAL; /* invalid request */
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| 312 | return(-1); /* return with an error */
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| 313 | }
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| 314 |
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| 315 | if (fcp->curlsn GT fcp->asects) { /* error if seek past EOF */
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| 316 |
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| 317 | #if DEBUGIT
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| 318 | if (fsdebug)
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| 319 | printf("_seek(): ERROR - seek past EOF - curlsn=%ld, asects=%ld\n",
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| 320 | fcp->curlsn, fcp->asects);
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| 321 | #endif
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| 322 |
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| 323 | errno = EINVAL; /* invalid request */
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| 324 | return(-1); /* return with an error */
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| 325 | }
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| 326 |
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| 327 | spc = _thebpb->clsiz; /* get sectors per cluster */
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| 328 | rcls = fcp->curlsn / spc; /* calculate relative cluster */
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| 329 | sic = fcp->curlsn - (rcls * spc); /* calculate sector in cluster */
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| 330 | acls = micons(fcp->de.bclust); /* get first cluster */
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| 331 | fcp->modefl &= ~FC_EOF; /* turn off the EOF flag */
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| 332 |
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| 333 | #if DEBUGIT
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| 334 | if (fsdebug) {
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| 335 | printf("_seek(): ENTRY curlsn=%ld, acls=%u, sic=%d, curdsn=%ld, rcls=%u, asects=%ld\n",
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| 336 | fcp->curlsn, acls, sic, fcp->curdsn, rcls, fcp->asects);
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| 337 | }
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| 338 | #endif
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| 339 |
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| 340 | if (fcp->curlsn EQ fcp->asects) { /* see if we seeked to EOF */
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| 341 |
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| 342 | fcp->modefl |= FC_EOF; /* flag the EOF condition */
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| 343 |
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| 344 | #if DEBUGIT
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| 345 | if (fsdebug)
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| 346 | printf("_seek(): EOF curlsn=%ld, acls=%u, sic=%d, curdsn=%ld\n",
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| 347 | fcp->curlsn, acls, sic, fcp->curdsn);
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| 348 | #endif
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| 349 |
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| 350 | if (acls EQ 0) /* see if anything allocated */
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| 351 | return(2); /* hard EOF if nothing there */
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| 352 |
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| 353 | if (sic EQ 0) /* see if first in cluster */
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| 354 | return(2); /* hard EOF if so */
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| 355 | }
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| 356 |
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[fa38804] | 357 |
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[f40a309] | 358 | for (nc = 0; nc < rcls; nc++) { /* follow the FAT chain */
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| 359 |
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| 360 | acls = _gtcl12(_thefat, acls); /* next cluster pointer */
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| 361 |
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| 362 | if (acls LT 0x0FF0) /* OK if it's a good cluster */
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| 363 | continue;
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| 364 |
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| 365 | fcp->modefl |= FC_ERR; /* EOF or bad cluster hit */
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| 366 | errno = EINVAL; /* mark it as an invalid seek */
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| 367 |
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| 368 | if (acls LT 0x0FF8) { /* bad cluster ? */
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| 369 |
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| 370 | errno = EIO; /* mark it as an I/O error */
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| 371 | fcp->modefl |= FC_BAD; /* mark FCB: bad cluster hit */
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| 372 | }
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| 373 |
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| 374 | return(IO_ERR); /* ERROR: seek error */
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| 375 | }
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| 376 |
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| 377 | fcp->curcls = acls; /* current cluster */
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| 378 | fcp->clsec = sic; /* sector in cluster */
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| 379 |
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| 380 | fcp->curdsn = _cl2lsn(_thebpb, acls) + sic; /* disk sector number */
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| 381 |
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| 382 | #if DEBUGIT
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| 383 | if (fsdebug)
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| 384 | printf("_seek(): OK curlsn=%ld, acls=%u, sic=%d, curdsn=%ld\n",
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| 385 | fcp->curlsn, acls, sic, fcp->curdsn);
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| 386 | #endif
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| 387 |
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| 388 | if (fcp->curlsn EQ fcp->asects) /* see if we're at EOF */
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| 389 | return(1); /* soft EOF */
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| 390 |
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| 391 | return(0); /* not EOF */
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| 392 | }
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| 393 |
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| 394 | /*
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| 395 | =============================================================================
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| 396 | _ftrnc(dp) -- truncate file pointed to by directory entry 'dp'
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| 397 | =============================================================================
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| 398 | */
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| 399 |
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[7258c6a] | 400 | int16_t _ftrnc(struct dirent *dp)
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[f40a309] | 401 | {
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[7258c6a] | 402 | register uint16_t acls, ncls;
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[f40a309] | 403 |
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| 404 | #if DEBUGIT
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| 405 | register int lim;
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| 406 |
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| 407 | lim = _thebpb->numcl;
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| 408 | #endif
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| 409 |
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| 410 | acls = micons(dp->bclust); /* get first cluster number */
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| 411 |
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| 412 | /* zap entries until EOF or bad cluster */
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| 413 |
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| 414 | #if DEBUGIT
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| 415 | while (lim-- AND (acls LT 0x0FF0)) {
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| 416 | #else
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| 417 | while (acls LT 0x0FF0) {
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| 418 | #endif
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| 419 |
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| 420 | ncls = _gtcl12(_thefat, acls); /* get next cluster number */
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| 421 | _ptcl12(_thefat, acls, 0); /* zap the current one */
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| 422 |
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| 423 | #if DEBUGIT
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| 424 | if (fsdebug)
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| 425 | printf("_ftrnc(): zapped %d\n", acls);
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| 426 | #endif
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| 427 |
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| 428 | acls = ncls; /* point at the next one */
|
---|
| 429 | }
|
---|
| 430 |
|
---|
| 431 | dp->flen = 0L; /* file length = 0 */
|
---|
| 432 | dp->bclust = 0; /* no sectors allocated */
|
---|
| 433 | _fatmod = TRUE; /* FAT got changed */
|
---|
| 434 | _dirmod = TRUE; /* directory got changed */
|
---|
| 435 |
|
---|
| 436 | #if DEBUGIT
|
---|
| 437 | if (lim LE 0) {
|
---|
| 438 |
|
---|
| 439 | errno = EIO;
|
---|
| 440 | printf("_ftrnc(): ERROR - lim went to %d\n", lim);
|
---|
| 441 | mdump(_thefat, (char *)_thefat+255, _thefat);
|
---|
| 442 | xtrap15();
|
---|
| 443 | return(FAILURE);
|
---|
| 444 | }
|
---|
| 445 | #endif
|
---|
| 446 |
|
---|
| 447 | return(SUCCESS);
|
---|
| 448 | }
|
---|
| 449 |
|
---|
| 450 | /*
|
---|
| 451 | =============================================================================
|
---|
| 452 | _newcls() -- allocate a new cluster
|
---|
| 453 | =============================================================================
|
---|
| 454 | */
|
---|
| 455 |
|
---|
[7258c6a] | 456 | int16_t _newcls(void)
|
---|
[f40a309] | 457 | {
|
---|
[7258c6a] | 458 | register int16_t tc, i;
|
---|
[f40a309] | 459 |
|
---|
| 460 | tc = _thebpb->numcl;
|
---|
| 461 |
|
---|
| 462 | for (i = 2; i < tc; i++)
|
---|
| 463 | if (0 EQ _gtcl12(_thefat, i))
|
---|
| 464 | return(i);
|
---|
| 465 |
|
---|
| 466 | return(0); /* ERROR: no empty clusters left */
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | /*
|
---|
| 470 | =============================================================================
|
---|
| 471 | _alcnew() -- allocate a new cluster to extend a file
|
---|
| 472 | =============================================================================
|
---|
| 473 | */
|
---|
| 474 |
|
---|
[7258c6a] | 475 | int16_t _alcnew(struct fcb *fcp)
|
---|
[f40a309] | 476 | {
|
---|
[7258c6a] | 477 | register int16_t ac, nc, pc;
|
---|
[f40a309] | 478 |
|
---|
| 479 | #if DEBUGIT
|
---|
| 480 | register int lim;
|
---|
| 481 | #endif
|
---|
| 482 |
|
---|
| 483 | if (nc = _newcls()) { /* get a new cluster */
|
---|
| 484 |
|
---|
| 485 | #if DEBUGIT
|
---|
| 486 | lim = (fcp->asects / _thebpb->clsiz) + 1; /* limit search */
|
---|
| 487 | #endif
|
---|
| 488 |
|
---|
| 489 | _ptcl12(_thefat, nc, FAT_EOF); /* mark new cluster as EOF */
|
---|
| 490 | pc = micons(fcp->de.bclust); /* get first cluster */
|
---|
| 491 |
|
---|
| 492 | #if DEBUGIT
|
---|
| 493 | if (pc EQ 0) {
|
---|
| 494 |
|
---|
| 495 | printf("_alcnew(): ERROR - pc EQ 0, bclust=$%04.4X, nc=%d\n",
|
---|
| 496 | fcp->de.bclust, nc);
|
---|
| 497 | xtrap15();
|
---|
| 498 | }
|
---|
| 499 | #endif
|
---|
| 500 |
|
---|
| 501 | /* find end of allocation chain */
|
---|
| 502 |
|
---|
| 503 | #if DEBUGIT
|
---|
| 504 | while (lim-- AND ((ac = _gtcl12(_thefat, pc)) < 0x0FF0)) {
|
---|
| 505 | #else
|
---|
| 506 | while ((ac = _gtcl12(_thefat, pc)) < 0x0FF0) {
|
---|
| 507 | #endif
|
---|
| 508 |
|
---|
| 509 | pc = ac;
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 | #if DEBUGIT
|
---|
| 513 | if (lim LE 0) {
|
---|
| 514 |
|
---|
| 515 | printf("_alcnew(): ERROR - lim ran out, nc=%d\n", nc);
|
---|
| 516 | mdump(_thefat, (char *)_thefat+63, _thefat);
|
---|
| 517 | xtrap15();
|
---|
| 518 | return(FAILURE);
|
---|
| 519 | }
|
---|
| 520 | #endif
|
---|
| 521 |
|
---|
| 522 | _ptcl12(_thefat, pc, nc); /* add cluster to chain */
|
---|
| 523 | fcp->asects += _thebpb->clsiz; /* update allocated sector count */
|
---|
| 524 | fcp->curcls = nc; /* current cluster = new cluster */
|
---|
| 525 | fcp->clsec = 0; /* current sector in cluster = 0 */
|
---|
| 526 |
|
---|
| 527 | fcp->curdsn = _cl2lsn(_thebpb, nc); /* current disk sector */
|
---|
| 528 |
|
---|
| 529 | #if DEBUGIT
|
---|
| 530 | if (fsdebug) {
|
---|
| 531 |
|
---|
| 532 | printf("alcnew(): allocated cluster %d (%04.4x), ",
|
---|
| 533 | nc, nc);
|
---|
| 534 | printf("previous = %d (%04.04x), asects =%ld\n",
|
---|
| 535 | pc, pc, fcp->asects);
|
---|
| 536 | }
|
---|
| 537 | #endif
|
---|
| 538 |
|
---|
| 539 | return(SUCCESS); /* return: file extended */
|
---|
| 540 |
|
---|
| 541 | } else {
|
---|
| 542 |
|
---|
| 543 | #if DEBUGIT
|
---|
| 544 | if (fsdebug)
|
---|
| 545 | printf("_alcnew(): _newcls() FAILED\n");
|
---|
| 546 | #endif
|
---|
| 547 |
|
---|
| 548 | return(FAILURE); /* return: no clusters left */
|
---|
| 549 | }
|
---|
| 550 | }
|
---|
| 551 |
|
---|
| 552 | /*
|
---|
| 553 | =============================================================================
|
---|
| 554 | _fmake(fcp) -- make a new file from the FCB pointed to by 'fcp'
|
---|
| 555 | =============================================================================
|
---|
| 556 | */
|
---|
| 557 |
|
---|
[7258c6a] | 558 | int16_t _fmake(struct fcb *fcp)
|
---|
[f40a309] | 559 | {
|
---|
| 560 | register struct dirent *dp;
|
---|
| 561 |
|
---|
| 562 | if (DE_NULL EQ (dp = _dsnew())) /* find a dirent */
|
---|
| 563 | return(FAILURE);
|
---|
| 564 |
|
---|
| 565 | _dptr = dp; /* set the directory pointer */
|
---|
| 566 | memset(dp, 0, DENTSIZE); /* clear the dirent */
|
---|
| 567 | memcpy(dp->fname, fcp->de.fname, 12); /* setup file name, attribute */
|
---|
| 568 | dp->atrib |= F_ARCHIV; /* set the archive bit */
|
---|
| 569 | _dirmod = TRUE; /* directory got changed */
|
---|
| 570 | return(SUCCESS);
|
---|
| 571 | }
|
---|
| 572 |
|
---|
| 573 | /*
|
---|
| 574 | =============================================================================
|
---|
| 575 | _opnvol() -- open a volume
|
---|
| 576 | =============================================================================
|
---|
| 577 | */
|
---|
| 578 |
|
---|
[7258c6a] | 579 | int16_t _opnvol(void)
|
---|
[f40a309] | 580 | {
|
---|
[7258c6a] | 581 | register int32_t drc;
|
---|
[f40a309] | 582 |
|
---|
| 583 | /* check for media change if we already have a BPB */
|
---|
| 584 |
|
---|
| 585 | if (_bpbin) {
|
---|
| 586 |
|
---|
| 587 | drc = BIOS(B_MCHG, 0);
|
---|
| 588 |
|
---|
| 589 | #if DEBUGIT
|
---|
| 590 | if (fsdebug) {
|
---|
| 591 |
|
---|
| 592 | printf("_opnvol(): found _bpbin FALSE\n");
|
---|
| 593 | printf("_opnvol(): disk change test returned %ld\n", drc);
|
---|
| 594 | }
|
---|
| 595 | #endif
|
---|
| 596 |
|
---|
| 597 | if (drc)
|
---|
| 598 | _bpbin = FALSE;
|
---|
| 599 | } else {
|
---|
| 600 |
|
---|
| 601 | #if DEBUGIT
|
---|
| 602 | if (fsdebug)
|
---|
| 603 | printf("_opnvol(): found _bpbin FALSE\n");
|
---|
| 604 | #endif
|
---|
| 605 |
|
---|
| 606 | }
|
---|
| 607 |
|
---|
| 608 | if (!_bpbin) { /* access the BPB */
|
---|
| 609 |
|
---|
| 610 | _fatin = FALSE; /* invalidate the FAT and directory */
|
---|
| 611 | _dirin = FALSE;
|
---|
| 612 |
|
---|
[4422c8e] | 613 | if (NULL EQ (_thebpb = (struct bpb *)BIOS(B_GBPB, 0))) {
|
---|
[f40a309] | 614 |
|
---|
| 615 | errno = EIO; /* couldn't read the BPB */
|
---|
| 616 | return(FAILURE);
|
---|
| 617 | }
|
---|
| 618 |
|
---|
| 619 | _bpbin = TRUE;
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 | if (!_fatin) { /* access the FAT */
|
---|
| 623 |
|
---|
| 624 | _dirin = FALSE;
|
---|
| 625 |
|
---|
| 626 | if (_rdfat(_thefat, _thebpb) < 0) {
|
---|
| 627 |
|
---|
| 628 | errno = EIO; /* couldn't read either FAT */
|
---|
| 629 | return(FAILURE);
|
---|
| 630 | }
|
---|
| 631 |
|
---|
| 632 | _fatin = TRUE;
|
---|
| 633 | _fatmod = FALSE;
|
---|
| 634 | }
|
---|
[fa38804] | 635 |
|
---|
[f40a309] | 636 | if (!_dirin) { /* access the root directory */
|
---|
| 637 |
|
---|
| 638 | if (_rdroot(_thedir, _thebpb)) {
|
---|
| 639 |
|
---|
| 640 | errno = EIO; /* couldn't read the directory */
|
---|
| 641 | return(FAILURE);
|
---|
| 642 | }
|
---|
| 643 |
|
---|
| 644 | _dirin = TRUE;
|
---|
| 645 | _dirmod = FALSE;
|
---|
| 646 | }
|
---|
| 647 |
|
---|
| 648 | return(SUCCESS);
|
---|
| 649 | }
|
---|
| 650 |
|
---|
| 651 | /*
|
---|
| 652 | =============================================================================
|
---|
| 653 | _opfcb(fcp) -- open the FCB pointed to by 'fcp'. Returns 0 if
|
---|
| 654 | opened successfully, -1 if an error occurred, with the error code
|
---|
| 655 | in errno.
|
---|
| 656 | =============================================================================
|
---|
| 657 | */
|
---|
| 658 |
|
---|
[7258c6a] | 659 | int16_t _opfcb(struct fcb *fcp)
|
---|
[f40a309] | 660 | {
|
---|
[7258c6a] | 661 | int16_t rc;
|
---|
[f40a309] | 662 |
|
---|
| 663 | /* check for an already open FCB */
|
---|
| 664 |
|
---|
| 665 | if (fcp->modefl & FC_OPN) {
|
---|
| 666 |
|
---|
| 667 | errno = EINVAL;
|
---|
| 668 | return(IO_ERR);
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | if (_opnvol()) { /* open the volume */
|
---|
| 672 |
|
---|
| 673 | _deadio(fcp, errno);
|
---|
| 674 | return(IO_ERR);
|
---|
| 675 | }
|
---|
| 676 |
|
---|
| 677 | /* search the directory for the file */
|
---|
| 678 |
|
---|
| 679 | if (DE_NULL EQ (_dptr = _dsrch(&fcp->de))) {
|
---|
| 680 |
|
---|
| 681 | /* file doesn't exist -- see if we should create it */
|
---|
| 682 |
|
---|
| 683 | if (!(fcp->modefl & FC_CR)) {
|
---|
| 684 |
|
---|
| 685 | _deadio(fcp, ENOENT); /* file nonexistant, not creating one */
|
---|
| 686 | return(IO_ERR);
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 | /* create the file */
|
---|
| 690 |
|
---|
| 691 | if(rc = _fmake(fcp)) {
|
---|
| 692 |
|
---|
| 693 | _deadio(fcp, EIO); /* couldn't create the file */
|
---|
| 694 | return(IO_ERR);
|
---|
| 695 | }
|
---|
| 696 |
|
---|
| 697 | } else {
|
---|
| 698 |
|
---|
| 699 | /* file exists -- check for writes to a read-only file */
|
---|
| 700 |
|
---|
| 701 | if ( (fcp->de.atrib & F_RDONLY) AND
|
---|
| 702 | (fcp->modefl & (FC_AP | FC_WR | FC_TR)) ) {
|
---|
| 703 |
|
---|
| 704 | /* can't append, write or truncate RO files */
|
---|
| 705 |
|
---|
| 706 | _deadio(fcp, EACCES);
|
---|
| 707 | return(IO_ERR);
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 | /* check for append and not write */
|
---|
| 711 |
|
---|
| 712 | if ((fcp->modefl & FC_AP) AND !(fcp->modefl & FC_WR)) {
|
---|
| 713 |
|
---|
| 714 | /* can't append if not open to write */
|
---|
| 715 |
|
---|
| 716 | _deadio(fcp, EACCES);
|
---|
| 717 | return(IO_ERR);
|
---|
| 718 | }
|
---|
| 719 |
|
---|
| 720 | /* check for create and exclusive with extant file */
|
---|
| 721 |
|
---|
| 722 | if ((fcp->modefl & FC_CR) AND (fcp->modefl & FC_EX)) {
|
---|
| 723 |
|
---|
| 724 | /* file exists and open was create-exclusive */
|
---|
| 725 |
|
---|
| 726 | _deadio(fcp, EEXIST);
|
---|
| 727 | return(IO_ERR);
|
---|
| 728 | }
|
---|
| 729 |
|
---|
| 730 | /* truncate the file if requested */
|
---|
| 731 |
|
---|
| 732 | if (fcp->modefl & FC_TR) {
|
---|
| 733 |
|
---|
| 734 | /* see if we can write */
|
---|
| 735 |
|
---|
| 736 | if (fcp->modefl & FC_WR) {
|
---|
| 737 |
|
---|
| 738 | /* truncate the file */
|
---|
| 739 |
|
---|
| 740 | if (_ftrnc(_dptr)) {
|
---|
| 741 |
|
---|
| 742 | _deadio(fcp, EIO); /* truncation failed */
|
---|
| 743 | return(IO_ERR);
|
---|
| 744 | }
|
---|
| 745 |
|
---|
| 746 | } else {
|
---|
| 747 |
|
---|
| 748 | /* we can't write, so we can't truncate */
|
---|
| 749 |
|
---|
| 750 | _deadio(fcp, EACCES);
|
---|
| 751 | return(IO_ERR);
|
---|
| 752 | }
|
---|
| 753 | }
|
---|
| 754 | }
|
---|
| 755 |
|
---|
| 756 | /* setup the FCB fields */
|
---|
| 757 |
|
---|
| 758 | memcpy(&fcp->de, _dptr, DENTSIZE);
|
---|
| 759 | fcp->clsec = 0;
|
---|
| 760 | fcp->curcls = micons(fcp->de.bclust);
|
---|
| 761 | fcp->offset = 0;
|
---|
| 762 | fcp->curlsn = 0L;
|
---|
| 763 | fcp->curdsn = fcp->de.bclust ? _cl2lsn(_thebpb, fcp->curcls) : 0;
|
---|
| 764 | fcp->curlen = miconl(fcp->de.flen);
|
---|
| 765 |
|
---|
| 766 | fcp->asects = ((fcp->curlen / _thebpb->clsizb)
|
---|
| 767 | + ((fcp->curlen & (_thebpb->clsizb - 1)) ? 1 : 0))
|
---|
| 768 | * _thebpb->clsiz;
|
---|
| 769 |
|
---|
| 770 | fcp->modefl &= ~(FC_EOF | FC_BAD | FC_ERR);
|
---|
| 771 | fcp->modefl |= FC_OPN;
|
---|
| 772 |
|
---|
| 773 | #if DEBUGIT
|
---|
| 774 | if (fsdebug)
|
---|
| 775 | SnapFCB(fcp);
|
---|
| 776 | #endif
|
---|
| 777 |
|
---|
| 778 | return(IO_OK);
|
---|
| 779 | }
|
---|
| 780 |
|
---|
| 781 | /*
|
---|
| 782 | =============================================================================
|
---|
| 783 | _inifcb(fcp, name, ext, mode) -- initialize FCB pointed to by 'fcp'
|
---|
| 784 | for file named 'name'.'ext' in mode 'mode'.
|
---|
| 785 | Returns SUCCESS (0) if ok, FAILURE (-1) if not.
|
---|
| 786 | =============================================================================
|
---|
| 787 | */
|
---|
| 788 |
|
---|
[7258c6a] | 789 | int16_t _inifcb(struct fcb *fcp, int8_t *name, int8_t *ext, int16_t mode)
|
---|
[f40a309] | 790 | {
|
---|
[7258c6a] | 791 | int16_t fl;
|
---|
| 792 | register int16_t i;
|
---|
| 793 | register int8_t *s1, *s2, c;
|
---|
[f40a309] | 794 |
|
---|
| 795 | /* clear the FCB */
|
---|
| 796 |
|
---|
[7258c6a] | 797 | memset((int8_t *)fcp, 0, sizeof (struct fcb));
|
---|
[f40a309] | 798 |
|
---|
| 799 | /* check for valid flags */
|
---|
| 800 |
|
---|
| 801 | if (mode & ~(O_WRONLY|O_RDWR|O_NDELAY|O_APPEND|O_CREAT|O_TRUNC|O_EXCL|O_RAW))
|
---|
| 802 | return(FAILURE);
|
---|
| 803 |
|
---|
[fa38804] | 804 |
|
---|
[f40a309] | 805 | /* check the file name for length */
|
---|
| 806 |
|
---|
| 807 | fl = TRUE;
|
---|
| 808 | s1 = name;
|
---|
| 809 |
|
---|
| 810 | for (i = 0; i < 9; i++)
|
---|
| 811 | if (*s1++ EQ '\0') {
|
---|
| 812 |
|
---|
| 813 | fl = FALSE;
|
---|
| 814 | break;
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | if (fl)
|
---|
| 818 | return(FAILURE);
|
---|
| 819 |
|
---|
| 820 | /* check the file name extension for length */
|
---|
| 821 |
|
---|
| 822 | fl = TRUE;
|
---|
| 823 | s1 = ext;
|
---|
| 824 |
|
---|
| 825 | for (i = 0; i <4; i++)
|
---|
| 826 | if (*s1++ EQ '\0') {
|
---|
| 827 |
|
---|
| 828 | fl = FALSE;
|
---|
| 829 | break;
|
---|
| 830 | }
|
---|
| 831 |
|
---|
| 832 | if (fl)
|
---|
| 833 | return(FAILURE);
|
---|
| 834 |
|
---|
[fa38804] | 835 |
|
---|
[f40a309] | 836 | /* clear the file name and extension in the FCB to blanks */
|
---|
| 837 |
|
---|
| 838 | memset(fcp->de.fname, ' ', 11);
|
---|
| 839 |
|
---|
| 840 | /* move the file name into the FCB */
|
---|
| 841 |
|
---|
| 842 | s1 = fcp->de.fname;
|
---|
| 843 | s2 = name;
|
---|
| 844 |
|
---|
| 845 | for (i = 0; i < 8; i++) {
|
---|
| 846 |
|
---|
| 847 | c = *s2++;
|
---|
| 848 |
|
---|
| 849 | if ((c EQ '\0') OR (c EQ ' '))
|
---|
| 850 | break;
|
---|
| 851 |
|
---|
| 852 | *s1++ = c;
|
---|
| 853 | }
|
---|
| 854 |
|
---|
| 855 | /* move the file name extension into the FCB */
|
---|
| 856 |
|
---|
| 857 | s1 = fcp->de.fext;
|
---|
| 858 | s2 = ext;
|
---|
| 859 |
|
---|
| 860 | for (i = 0; i < 3; i++) {
|
---|
| 861 |
|
---|
| 862 | c = *s2++;
|
---|
| 863 |
|
---|
| 864 | if ((c EQ '\0') OR (c EQ ' '))
|
---|
| 865 | break;
|
---|
| 866 |
|
---|
| 867 | *s1++ = c;
|
---|
| 868 | }
|
---|
| 869 |
|
---|
| 870 | /* set the flags in the FCB and exit */
|
---|
| 871 |
|
---|
| 872 | if (mode & O_RDONLY)
|
---|
| 873 | fcp->modefl |= FC_RD;
|
---|
| 874 |
|
---|
| 875 | if (mode & O_WRONLY)
|
---|
| 876 | fcp->modefl |= FC_WR;
|
---|
| 877 |
|
---|
| 878 | if (mode & O_RDWR)
|
---|
| 879 | fcp->modefl |= FC_RW;
|
---|
| 880 |
|
---|
| 881 | if (mode & O_NDELAY)
|
---|
| 882 | fcp->modefl |= FC_NB;
|
---|
| 883 |
|
---|
| 884 | if (mode & O_APPEND)
|
---|
| 885 | fcp->modefl |= FC_AP;
|
---|
| 886 |
|
---|
| 887 | if (mode & O_CREAT)
|
---|
| 888 | fcp->modefl |= FC_CR;
|
---|
| 889 |
|
---|
| 890 | if (mode & O_TRUNC)
|
---|
| 891 | fcp->modefl |= FC_TR;
|
---|
| 892 |
|
---|
| 893 | if (mode & O_EXCL)
|
---|
| 894 | fcp->modefl |= FC_EX;
|
---|
| 895 |
|
---|
| 896 | if (mode & O_RAW)
|
---|
| 897 | fcp->modefl |= FC_BF;
|
---|
| 898 |
|
---|
| 899 | return(SUCCESS);
|
---|
| 900 | }
|
---|
| 901 |
|
---|
| 902 | /*
|
---|
| 903 | =============================================================================
|
---|
| 904 | ClsFile() -- Closes the file controlled by the FCB pointed to by 'fcp'
|
---|
| 905 | at the bios level.
|
---|
| 906 | =============================================================================
|
---|
| 907 | */
|
---|
| 908 |
|
---|
[7258c6a] | 909 | int16_t ClsFile(struct fcb *fcp)
|
---|
[f40a309] | 910 | {
|
---|
| 911 | register struct dirent *dp;
|
---|
| 912 |
|
---|
| 913 | #if DEBUGIT
|
---|
| 914 | if (fsdebug) {
|
---|
| 915 |
|
---|
| 916 | printf("ClsFile($%08lX): closing file\n", fcp);
|
---|
| 917 | SnapFCB(fcp);
|
---|
| 918 | }
|
---|
| 919 | #endif
|
---|
| 920 |
|
---|
| 921 | if (fcp->modefl & FC_OPN) { /* is it open ? */
|
---|
| 922 |
|
---|
| 923 | if (fcp->modefl & (FC_CR | FC_AP | FC_WR)) { /* writing ? */
|
---|
| 924 |
|
---|
| 925 | if (dp = _dsrch(&fcp->de)) { /* locate the dirent */
|
---|
| 926 |
|
---|
| 927 | /* update the directory entry if it changed */
|
---|
| 928 |
|
---|
| 929 | if (memcmp(dp, &fcp->de, DENTSIZE)) {
|
---|
| 930 |
|
---|
| 931 | memcpy(dp, &fcp->de, DENTSIZE);
|
---|
| 932 | _dirmod = TRUE;
|
---|
| 933 | #if DEBUGIT
|
---|
| 934 | if (fsdebug) {
|
---|
| 935 |
|
---|
| 936 | printf("ClsFile(): updated the directory. FAT:\n");
|
---|
| 937 | mdump(_thefat, (char *)_thefat+127, _thefat);
|
---|
| 938 | }
|
---|
| 939 | #endif
|
---|
| 940 |
|
---|
| 941 | }
|
---|
| 942 |
|
---|
| 943 | } else {
|
---|
| 944 |
|
---|
| 945 | #if DEBUGIT
|
---|
| 946 | if (fsdebug)
|
---|
| 947 | printf("ClsFile(): ERROR - can't find the directory entry\n");
|
---|
| 948 | #endif
|
---|
| 949 |
|
---|
| 950 | errno = EIO; /* can't find the entry */
|
---|
| 951 | return(FAILURE);
|
---|
| 952 | }
|
---|
| 953 | }
|
---|
| 954 |
|
---|
| 955 | #if DEBUGIT
|
---|
| 956 | if (fsdebug)
|
---|
| 957 | SnapFCB(fcp);
|
---|
| 958 | #endif
|
---|
| 959 |
|
---|
| 960 | return(SUCCESS);
|
---|
| 961 |
|
---|
| 962 | } else { /* not open */
|
---|
| 963 |
|
---|
| 964 | #if DEBUGIT
|
---|
| 965 | if (fsdebug)
|
---|
| 966 | printf("ClsFile(): ERROR - file not open\n");
|
---|
| 967 | #endif
|
---|
| 968 |
|
---|
| 969 | errno = EINVAL;
|
---|
| 970 | return(FAILURE);
|
---|
| 971 | }
|
---|
| 972 | }
|
---|
| 973 |
|
---|
| 974 | /*
|
---|
| 975 | =============================================================================
|
---|
| 976 | _clsvol() -- close the volume
|
---|
| 977 | =============================================================================
|
---|
| 978 | */
|
---|
| 979 |
|
---|
[0580615] | 980 | void _clsvol(void)
|
---|
[f40a309] | 981 | {
|
---|
| 982 | if (_fatmod) {
|
---|
| 983 |
|
---|
| 984 | _clsfat();
|
---|
| 985 |
|
---|
| 986 | #if DEBUGIT
|
---|
| 987 | if (fsdebug)
|
---|
| 988 | printf("_clsvol(): modified FAT written\n");
|
---|
| 989 | #endif
|
---|
| 990 | }
|
---|
| 991 |
|
---|
| 992 | if (_dirmod) {
|
---|
| 993 |
|
---|
| 994 | _clsdir();
|
---|
| 995 |
|
---|
| 996 | #if DEBUGIT
|
---|
| 997 | if (fsdebug)
|
---|
| 998 | printf("_clsvol(): modified directory written\n");
|
---|
| 999 | #endif
|
---|
| 1000 | }
|
---|
| 1001 |
|
---|
| 1002 | _bpbin = FALSE;
|
---|
| 1003 | _fatin = FALSE;
|
---|
| 1004 | _dirin = FALSE;
|
---|
| 1005 | }
|
---|
| 1006 |
|
---|
| 1007 | /*
|
---|
| 1008 | =============================================================================
|
---|
| 1009 | fcbinit() -- initialize an FCB
|
---|
| 1010 | =============================================================================
|
---|
| 1011 | */
|
---|
| 1012 |
|
---|
[7258c6a] | 1013 | int16_t fcbinit(int8_t *name, struct fcb *fcp)
|
---|
[f40a309] | 1014 | {
|
---|
[7258c6a] | 1015 | int8_t tmpname[9], tmpext[4];
|
---|
[f40a309] | 1016 |
|
---|
| 1017 | return(_inifcb(fcp, FilName(name, tmpname), FilExt(name, tmpext), 0));
|
---|
| 1018 | }
|
---|
| 1019 |
|
---|
| 1020 | /*
|
---|
| 1021 | =============================================================================
|
---|
| 1022 | DelFile() -- Deletes the file named by fcb pointed to by 'fcp'.
|
---|
| 1023 | =============================================================================
|
---|
| 1024 | */
|
---|
| 1025 |
|
---|
[7258c6a] | 1026 | int16_t DelFile(struct fcb *fcp)
|
---|
[f40a309] | 1027 | {
|
---|
| 1028 | #if DEBUGIT
|
---|
| 1029 | if (fsdebug)
|
---|
| 1030 | printf("DelFile($%08.8lX): deleting [%-.8s].[%-.3s]\n",
|
---|
| 1031 | fcp, fcp->de.fname, fcp->de.fext);
|
---|
| 1032 | #endif
|
---|
| 1033 |
|
---|
| 1034 | if(_opnvol()) /* open the volume */
|
---|
| 1035 | return(FAILURE);
|
---|
| 1036 |
|
---|
| 1037 | if (DE_NULL EQ (_dptr = _dsrch(&fcp->de))) { /* find the file */
|
---|
| 1038 |
|
---|
| 1039 | errno = ENOENT; /* can't find the file */
|
---|
| 1040 | return(FAILURE);
|
---|
| 1041 | }
|
---|
| 1042 |
|
---|
| 1043 | if (_dptr->atrib & F_RDONLY) {
|
---|
| 1044 |
|
---|
| 1045 | errno = EACCES; /* can't delete an R/O file */
|
---|
| 1046 | return(FAILURE);
|
---|
| 1047 | }
|
---|
| 1048 |
|
---|
| 1049 | if (_ftrnc(_dptr)) /* truncate the file to free its space */
|
---|
| 1050 | return(FAILURE);
|
---|
| 1051 |
|
---|
| 1052 | _dptr->fname[0] = 0xE5; /* mark directory entry as free */
|
---|
| 1053 |
|
---|
| 1054 | #if DEBUGIT
|
---|
| 1055 | if (fsdebug)
|
---|
| 1056 | printf("DelFile($%08.8lX): file [%-.8s].[%-.3s] DELETED\n",
|
---|
| 1057 | fcp, fcp->de.fname, fcp->de.fext);
|
---|
| 1058 | #endif
|
---|
| 1059 |
|
---|
| 1060 | return(SUCCESS);
|
---|
| 1061 | }
|
---|
[6262b5c] | 1062 |
|
---|