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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14 | #define _FS_DEF_ /* to avoid unnecessary externals */
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15 |
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16 | #include "all.h"
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17 |
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18 | #define FAT_EOF 0x0FF8
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19 |
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20 | #define IO_ERR -1
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21 | #define IO_OK 0
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22 | #define IO_EOF 1
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23 |
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24 | #define DE_NULL ((struct dirent *)0L)
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25 |
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26 | extern int16_t micons(int16_t wi);
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27 | extern int32_t miconl(int32_t wi);
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28 | extern void _ptcl12(uint16_t *fat, uint16_t cl, uint16_t val);
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29 | extern int8_t *FilName(int8_t *s, int8_t *p);
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30 | extern int8_t *FilExt(int8_t *s, int8_t *p);
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31 |
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32 | extern void _clsdir(void);
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33 | extern void _clsfat(void);
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34 |
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35 | #if DEBUGIT
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36 | short fsdebug;
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37 | extern int mdump();
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38 | #endif
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39 |
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40 | struct bpb *_thebpb; /* BIOS parameter block pointer */
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41 | struct dirent _thedir[MAXDIRNT]; /* directory */
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42 | struct dirent *_dptr; /* internal directory pointer */
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43 |
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44 | uint16_t _thefat[MAXFAT * WDPSEC]; /* file allocation table */
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45 |
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46 | int16_t _fatin; /* FAT has been read */
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47 | int16_t _dirin; /* directory has been read */
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48 | int16_t _bpbin; /* BPB has been read */
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49 | int16_t _fatmod; /* FAT modified flag */
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50 | int16_t _dirmod; /* directory modified flag */
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51 |
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52 | int32_t _berrno; /* BIOS error number */
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53 |
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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 | /*
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60 | =============================================================================
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61 | _cl2lsn(bpp, clnum) -- return logical sector number for cluster 'clnum'
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62 | using BPB pointed to by 'bpp'
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63 | =============================================================================
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64 | */
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65 |
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66 | uint16_t _cl2lsn(struct bpb *bpp, uint16_t clnum)
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67 | {
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68 | return(bpp->datrec + (bpp->clsiz * (clnum - 2)) );
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69 | }
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70 |
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71 | /*
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72 | =============================================================================
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73 | _gtcl12(fat, cl) -- return 12 bit cluster entry 'cl' from FAT pointed
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74 | to by 'fat'
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75 | =============================================================================
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76 | */
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77 |
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78 | uint16_t _gtcl12(int8_t *fat, uint16_t cl)
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79 | {
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80 | register uint16_t cla, clt;
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81 |
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82 | cla = cl + (cl >> 1);
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83 | clt = ((uint16_t)0xFF00 & (fat[cla+1] << 8))
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84 | | ((uint16_t)0x00FF & fat[cla]);
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85 |
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86 | if (cl & 1)
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87 | clt >>= 4;
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88 |
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89 | clt &= (uint16_t)0x0FFF;
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90 | return(clt);
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91 | }
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92 |
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93 | /* |
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94 |
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95 | */
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96 |
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97 | /*
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98 | =============================================================================
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99 | _getfat(bufad, bpp, nfat) -- get FAT 'nfat' into buffer
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100 | pointed to by 'bufad' using BPB pointed to by 'bpp'
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101 | =============================================================================
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102 | */
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103 |
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104 | uint16_t _getfat(uint16_t *bufad, uint16_t nfat, struct bpb *bpp)
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105 | {
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106 | uint16_t fatsec;
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107 |
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108 | fatsec = nfat ? bpp->fatrec : (bpp->fatrec - bpp->fsiz);
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109 | return(BIOS(B_RDWR, 0, (int8_t *)bufad, bpp->fsiz, fatsec, 0));
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110 | }
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111 |
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112 | /* |
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113 |
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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 | _rdfat(bufad, bpp) -- read FAT into buffer pointed to by 'bufad'
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119 | using BPB pointed to by 'bpp'
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120 | =============================================================================
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121 | */
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122 |
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123 | int16_t _rdfat(uint16_t *bufad, struct bpb *bpp)
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124 | {
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125 | if (_getfat(bufad, bpp, 0)) {
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126 |
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127 | if (_getfat(bufad, bpp, 1))
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128 | return(IO_ERR); /* couldn't read either FAT */
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129 | else
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130 | return(1); /* secondary FAT read OK */
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131 |
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132 | } else
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133 | return(0); /* main FAT read OK */
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134 | }
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135 |
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136 | /*
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137 | =============================================================================
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138 | _rdroot(buf, bpp) -- read root directory into buffer
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139 | pointed to by 'buf' using BPB pointed to by 'bpp'
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140 | =============================================================================
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141 | */
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142 |
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143 | int16_t _rdroot(uint16_t *buf, struct bpb *bpp)
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144 | {
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145 | return(BIOS(B_RDWR, 0, (int8_t *)buf, bpp->rdlen,
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146 | (bpp->fatrec + bpp->fsiz), 0));
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147 | }
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148 |
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149 | /* |
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150 |
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151 | */
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152 |
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153 | /*
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154 | =============================================================================
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155 | _nsic(fcp, bpp, fp) -- get the next sector in the file controlled
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156 | by the FCB at 'fcp', using the BPB pointed to by 'bpp' and
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157 | the FAT pointed to by 'fp'. Returns 0 if successful, or -1 on error,
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158 | or 1 on EOF;
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159 | =============================================================================
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160 | */
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161 |
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162 | int16_t _nsic(struct fcb *fcp, struct bpb *bpp, int8_t *fp)
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163 | {
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164 | register uint16_t tfe;
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165 |
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166 | /* check the FCB flags */
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167 |
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168 | if (!(fcp->modefl & FC_OPN)) {
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169 |
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170 | errno = EINVAL; /* not open */
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171 | return(IO_ERR);
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172 | }
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173 |
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174 | if (fcp->modefl & FC_BAD) {
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175 |
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176 | errno = EIO; /* previous I/O error */
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177 | return(IO_ERR);
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178 | }
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179 |
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180 | if (fcp->de.bclust EQ 0) { /* no sectors allocated (empty file) */
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181 |
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182 | fcp->modefl |= FC_EOF;
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183 | return(IO_EOF);
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184 | }
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185 | /* |
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186 |
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187 | */
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188 | /* update clsec and curlsn and see if we need a new cluster */
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189 |
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190 | ++fcp->curlsn;
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191 |
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192 | if (++fcp->clsec GE bpp->clsiz) {
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193 |
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194 | /* new cluster needed -- follow the chain */
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195 |
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196 | fcp->clsec = 0;
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197 | tfe = _gtcl12(fp, fcp->curcls);
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198 |
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199 | if (tfe < 0x0FF0) { /* see if we've got a good cluster */
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200 |
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201 |
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202 | fcp->curcls = tfe; /* good cluster, update fcb */
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203 | fcp->curdsn = _cl2lsn(bpp, tfe);
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204 |
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205 | #if DEBUGIT
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206 | if (fsdebug)
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207 | printf("_nsic(): NXT curlsn=%ld, curcls=%u, curdsn=%ld\n",
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208 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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209 | #endif
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210 |
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211 | return(IO_OK);
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212 | }
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213 |
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214 | if (tfe < 0x0FF8) { /* see if it's a bad cluster */
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215 |
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216 | fcp-> modefl |= (FC_BAD | FC_EOF); /* bad one */
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217 |
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218 | #if DEBUGIT
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219 | if (fsdebug)
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220 | printf("_nsic(): IO_ERR - curlsn=%ld, curcls=%u, curdsn=%ld\n",
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221 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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222 | #endif
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223 |
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224 | return(IO_ERR);
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225 | }
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226 |
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227 | fcp->modefl |= FC_EOF; /* EOF hit -- set EOF in FCB */
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228 | return(IO_EOF);
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229 |
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230 | /* |
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231 |
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232 | */
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233 |
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234 | } else {
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235 |
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236 | ++fcp->curdsn; /* advance to next sector in current cluster */
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237 |
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238 | #if DEBUGIT
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239 | if (fsdebug)
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240 | printf("_nsic(): CUR curlsn=%ld, curcls=%u, curdsn=%ld\n",
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241 | fcp->curlsn, fcp->curcls, fcp->curdsn);
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242 | #endif
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243 |
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244 | return(IO_OK);
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245 | }
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246 | }
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247 |
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248 | /* |
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249 |
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250 | */
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251 |
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252 | /*
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253 | =============================================================================
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254 | _dsrch(de) -- search for the directory entry pointed to by 'de'
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255 | in the current directory
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256 | =============================================================================
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257 | */
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258 |
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259 | struct dirent *_dsrch(struct dirent *de)
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260 | {
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261 | uint16_t i, dl;
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262 | register struct dirent *dp;
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263 |
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264 | dp = _thedir;
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265 | dl = _thebpb->rdlen * (_thebpb->recsiz / DENTSIZE);
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266 |
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267 | for (i = 0; i < dl; i++) { /* check each entry */
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268 |
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269 | /* see if we've found it */
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270 |
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271 | if (0 EQ memcmpu(de->fname, dp->fname, 11))
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272 | return(dp);
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273 |
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274 | /* check for end of used entries */
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275 |
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276 | if ('\0' EQ dp->fname[0])
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277 | return(DE_NULL);
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278 |
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279 | dp++; /* point at next entry to check */
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280 | }
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281 |
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282 | return(DE_NULL);
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283 | }
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284 |
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285 | /* |
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286 |
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287 | */
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288 |
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289 | /*
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290 | =============================================================================
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291 | _dsnew() -- search for an available directory entry in the current
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292 | directory.
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293 | =============================================================================
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294 | */
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295 |
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296 | struct dirent *_dsnew(void)
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297 | {
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298 | uint16_t i, dl;
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299 | register struct dirent *dp;
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300 |
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301 | dp = _thedir;
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302 | dl = _thebpb->rdlen * (_thebpb->recsiz / DENTSIZE);
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303 |
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304 | for (i = 0; i < dl; i++) { /* check each entry */
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305 |
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306 | /* check for a deleted entry */
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307 |
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308 | if (0x00E5 EQ (0x00FF & dp->fname[0]))
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309 | return(dp);
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310 |
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311 | /* check for end of used entries */
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312 |
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313 | if ('\0' EQ dp->fname[0])
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314 | return(dp);
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315 |
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316 | dp++; /* point at next entry to check */
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317 | }
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318 |
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319 | return(DE_NULL); /* couldn't find an available entry */
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320 | }
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321 |
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322 | /* |
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323 |
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324 | */
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325 |
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326 | /*
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327 | =============================================================================
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328 | _deadio(fcp, err) -- mark the FCB pointed to by 'fcp' as 'in error'
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329 | =============================================================================
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330 | */
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331 |
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332 | void _deadio(struct fcb *fcp, int16_t err)
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333 | {
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334 | fcp->clsec = 0;
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335 | fcp->curcls = 0;
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336 | fcp->curlsn = 0L;
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337 | fcp->curdsn = 0L;
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338 | fcp->curlen = 0L;
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339 | fcp->modefl &= ~FC_OPN;
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340 | fcp->modefl |= FC_ERR;
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341 | errno = err;
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342 | }
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343 |
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344 | /* |
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345 |
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346 | */
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347 |
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348 | /*
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349 | =============================================================================
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350 | _seek(fcp) -- seek to logical sector number in FCB pointed to by 'fcp'.
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351 | Returns: -1 = error; 0 = not at EOF; 1 = soft EOF; 2 = hard EOF.
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352 | =============================================================================
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353 | */
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354 |
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355 | int16_t _seek(struct fcb *fcp)
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356 | {
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357 | register uint16_t acls, rcls, nc;
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358 | uint16_t sic, spc;
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359 |
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360 | if (!(fcp->modefl & FC_OPN)) { /* file must be open */
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361 |
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362 | errno = EINVAL; /* invalid request */
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363 | return(-1); /* return with an error */
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364 | }
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365 |
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366 | if (fcp->curlsn GT fcp->asects) { /* error if seek past EOF */
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367 |
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368 | #if DEBUGIT
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369 | if (fsdebug)
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370 | printf("_seek(): ERROR - seek past EOF - curlsn=%ld, asects=%ld\n",
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371 | fcp->curlsn, fcp->asects);
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372 | #endif
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373 |
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374 | errno = EINVAL; /* invalid request */
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375 | return(-1); /* return with an error */
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376 | }
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377 |
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378 | spc = _thebpb->clsiz; /* get sectors per cluster */
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379 | rcls = fcp->curlsn / spc; /* calculate relative cluster */
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380 | sic = fcp->curlsn - (rcls * spc); /* calculate sector in cluster */
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381 | acls = micons(fcp->de.bclust); /* get first cluster */
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382 | fcp->modefl &= ~FC_EOF; /* turn off the EOF flag */
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383 |
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384 | /* |
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385 |
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386 | */
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387 |
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388 | #if DEBUGIT
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389 | if (fsdebug) {
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390 | printf("_seek(): ENTRY curlsn=%ld, acls=%u, sic=%d, curdsn=%ld, rcls=%u, asects=%ld\n",
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391 | fcp->curlsn, acls, sic, fcp->curdsn, rcls, fcp->asects);
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392 | }
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393 | #endif
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394 |
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395 | if (fcp->curlsn EQ fcp->asects) { /* see if we seeked to EOF */
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396 |
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397 | fcp->modefl |= FC_EOF; /* flag the EOF condition */
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398 |
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399 | #if DEBUGIT
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400 | if (fsdebug)
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401 | printf("_seek(): EOF curlsn=%ld, acls=%u, sic=%d, curdsn=%ld\n",
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402 | fcp->curlsn, acls, sic, fcp->curdsn);
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403 | #endif
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404 |
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405 | if (acls EQ 0) /* see if anything allocated */
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406 | return(2); /* hard EOF if nothing there */
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407 |
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408 | if (sic EQ 0) /* see if first in cluster */
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409 | return(2); /* hard EOF if so */
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410 | }
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411 |
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412 | /* |
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413 |
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414 | */
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415 | for (nc = 0; nc < rcls; nc++) { /* follow the FAT chain */
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416 |
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417 | acls = _gtcl12(_thefat, acls); /* next cluster pointer */
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418 |
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419 | if (acls LT 0x0FF0) /* OK if it's a good cluster */
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420 | continue;
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421 |
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422 | fcp->modefl |= FC_ERR; /* EOF or bad cluster hit */
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423 | errno = EINVAL; /* mark it as an invalid seek */
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424 |
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425 | if (acls LT 0x0FF8) { /* bad cluster ? */
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426 |
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427 | errno = EIO; /* mark it as an I/O error */
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428 | fcp->modefl |= FC_BAD; /* mark FCB: bad cluster hit */
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429 | }
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430 |
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431 | return(IO_ERR); /* ERROR: seek error */
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432 | }
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433 |
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434 | fcp->curcls = acls; /* current cluster */
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435 | fcp->clsec = sic; /* sector in cluster */
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436 |
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437 | fcp->curdsn = _cl2lsn(_thebpb, acls) + sic; /* disk sector number */
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438 |
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439 | #if DEBUGIT
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440 | if (fsdebug)
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441 | printf("_seek(): OK curlsn=%ld, acls=%u, sic=%d, curdsn=%ld\n",
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442 | fcp->curlsn, acls, sic, fcp->curdsn);
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443 | #endif
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444 |
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445 | if (fcp->curlsn EQ fcp->asects) /* see if we're at EOF */
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446 | return(1); /* soft EOF */
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447 |
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448 | return(0); /* not EOF */
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449 | }
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450 |
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451 | /* |
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452 |
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453 | */
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454 |
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455 | /*
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456 | =============================================================================
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457 | _ftrnc(dp) -- truncate file pointed to by directory entry 'dp'
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458 | =============================================================================
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459 | */
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460 |
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461 | int16_t _ftrnc(struct dirent *dp)
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462 | {
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463 | register uint16_t acls, ncls;
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464 |
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465 | #if DEBUGIT
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466 | register int lim;
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467 |
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468 | lim = _thebpb->numcl;
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469 | #endif
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470 |
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471 | acls = micons(dp->bclust); /* get first cluster number */
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472 |
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473 | /* zap entries until EOF or bad cluster */
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474 |
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475 | #if DEBUGIT
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476 | while (lim-- AND (acls LT 0x0FF0)) {
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477 | #else
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478 | while (acls LT 0x0FF0) {
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479 | #endif
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480 |
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481 | ncls = _gtcl12(_thefat, acls); /* get next cluster number */
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482 | _ptcl12(_thefat, acls, 0); /* zap the current one */
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483 |
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484 | #if DEBUGIT
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485 | if (fsdebug)
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486 | printf("_ftrnc(): zapped %d\n", acls);
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487 | #endif
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488 |
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489 | acls = ncls; /* point at the next one */
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490 | }
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491 |
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492 | /* |
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493 |
|
---|
494 | */
|
---|
495 |
|
---|
496 | dp->flen = 0L; /* file length = 0 */
|
---|
497 | dp->bclust = 0; /* no sectors allocated */
|
---|
498 | _fatmod = TRUE; /* FAT got changed */
|
---|
499 | _dirmod = TRUE; /* directory got changed */
|
---|
500 |
|
---|
501 | #if DEBUGIT
|
---|
502 | if (lim LE 0) {
|
---|
503 |
|
---|
504 | errno = EIO;
|
---|
505 | printf("_ftrnc(): ERROR - lim went to %d\n", lim);
|
---|
506 | mdump(_thefat, (char *)_thefat+255, _thefat);
|
---|
507 | xtrap15();
|
---|
508 | return(FAILURE);
|
---|
509 | }
|
---|
510 | #endif
|
---|
511 |
|
---|
512 | return(SUCCESS);
|
---|
513 | }
|
---|
514 |
|
---|
515 | /* |
---|
516 |
|
---|
517 | */
|
---|
518 |
|
---|
519 | /*
|
---|
520 | =============================================================================
|
---|
521 | _newcls() -- allocate a new cluster
|
---|
522 | =============================================================================
|
---|
523 | */
|
---|
524 |
|
---|
525 | int16_t _newcls(void)
|
---|
526 | {
|
---|
527 | register int16_t tc, i;
|
---|
528 |
|
---|
529 | tc = _thebpb->numcl;
|
---|
530 |
|
---|
531 | for (i = 2; i < tc; i++)
|
---|
532 | if (0 EQ _gtcl12(_thefat, i))
|
---|
533 | return(i);
|
---|
534 |
|
---|
535 | return(0); /* ERROR: no empty clusters left */
|
---|
536 | }
|
---|
537 |
|
---|
538 | /* |
---|
539 |
|
---|
540 | */
|
---|
541 |
|
---|
542 | /*
|
---|
543 | =============================================================================
|
---|
544 | _alcnew() -- allocate a new cluster to extend a file
|
---|
545 | =============================================================================
|
---|
546 | */
|
---|
547 |
|
---|
548 | int16_t _alcnew(struct fcb *fcp)
|
---|
549 | {
|
---|
550 | register int16_t ac, nc, pc;
|
---|
551 |
|
---|
552 | #if DEBUGIT
|
---|
553 | register int lim;
|
---|
554 | #endif
|
---|
555 |
|
---|
556 | if (nc = _newcls()) { /* get a new cluster */
|
---|
557 |
|
---|
558 | #if DEBUGIT
|
---|
559 | lim = (fcp->asects / _thebpb->clsiz) + 1; /* limit search */
|
---|
560 | #endif
|
---|
561 |
|
---|
562 | _ptcl12(_thefat, nc, FAT_EOF); /* mark new cluster as EOF */
|
---|
563 | pc = micons(fcp->de.bclust); /* get first cluster */
|
---|
564 |
|
---|
565 | #if DEBUGIT
|
---|
566 | if (pc EQ 0) {
|
---|
567 |
|
---|
568 | printf("_alcnew(): ERROR - pc EQ 0, bclust=$%04.4X, nc=%d\n",
|
---|
569 | fcp->de.bclust, nc);
|
---|
570 | xtrap15();
|
---|
571 | }
|
---|
572 | #endif
|
---|
573 |
|
---|
574 | /* find end of allocation chain */
|
---|
575 |
|
---|
576 | #if DEBUGIT
|
---|
577 | while (lim-- AND ((ac = _gtcl12(_thefat, pc)) < 0x0FF0)) {
|
---|
578 | #else
|
---|
579 | while ((ac = _gtcl12(_thefat, pc)) < 0x0FF0) {
|
---|
580 | #endif
|
---|
581 |
|
---|
582 | pc = ac;
|
---|
583 | }
|
---|
584 |
|
---|
585 | /* |
---|
586 |
|
---|
587 | */
|
---|
588 |
|
---|
589 | #if DEBUGIT
|
---|
590 | if (lim LE 0) {
|
---|
591 |
|
---|
592 | printf("_alcnew(): ERROR - lim ran out, nc=%d\n", nc);
|
---|
593 | mdump(_thefat, (char *)_thefat+63, _thefat);
|
---|
594 | xtrap15();
|
---|
595 | return(FAILURE);
|
---|
596 | }
|
---|
597 | #endif
|
---|
598 |
|
---|
599 | _ptcl12(_thefat, pc, nc); /* add cluster to chain */
|
---|
600 | fcp->asects += _thebpb->clsiz; /* update allocated sector count */
|
---|
601 | fcp->curcls = nc; /* current cluster = new cluster */
|
---|
602 | fcp->clsec = 0; /* current sector in cluster = 0 */
|
---|
603 |
|
---|
604 | fcp->curdsn = _cl2lsn(_thebpb, nc); /* current disk sector */
|
---|
605 |
|
---|
606 | #if DEBUGIT
|
---|
607 | if (fsdebug) {
|
---|
608 |
|
---|
609 | printf("alcnew(): allocated cluster %d (%04.4x), ",
|
---|
610 | nc, nc);
|
---|
611 | printf("previous = %d (%04.04x), asects =%ld\n",
|
---|
612 | pc, pc, fcp->asects);
|
---|
613 | }
|
---|
614 | #endif
|
---|
615 |
|
---|
616 | return(SUCCESS); /* return: file extended */
|
---|
617 |
|
---|
618 | } else {
|
---|
619 |
|
---|
620 | #if DEBUGIT
|
---|
621 | if (fsdebug)
|
---|
622 | printf("_alcnew(): _newcls() FAILED\n");
|
---|
623 | #endif
|
---|
624 |
|
---|
625 | return(FAILURE); /* return: no clusters left */
|
---|
626 | }
|
---|
627 | }
|
---|
628 |
|
---|
629 | /* |
---|
630 |
|
---|
631 | */
|
---|
632 |
|
---|
633 | /*
|
---|
634 | =============================================================================
|
---|
635 | _fmake(fcp) -- make a new file from the FCB pointed to by 'fcp'
|
---|
636 | =============================================================================
|
---|
637 | */
|
---|
638 |
|
---|
639 | int16_t _fmake(struct fcb *fcp)
|
---|
640 | {
|
---|
641 | register struct dirent *dp;
|
---|
642 |
|
---|
643 | if (DE_NULL EQ (dp = _dsnew())) /* find a dirent */
|
---|
644 | return(FAILURE);
|
---|
645 |
|
---|
646 | _dptr = dp; /* set the directory pointer */
|
---|
647 | memset(dp, 0, DENTSIZE); /* clear the dirent */
|
---|
648 | memcpy(dp->fname, fcp->de.fname, 12); /* setup file name, attribute */
|
---|
649 | dp->atrib |= F_ARCHIV; /* set the archive bit */
|
---|
650 | _dirmod = TRUE; /* directory got changed */
|
---|
651 | return(SUCCESS);
|
---|
652 | }
|
---|
653 |
|
---|
654 | /* |
---|
655 |
|
---|
656 | */
|
---|
657 |
|
---|
658 | /*
|
---|
659 | =============================================================================
|
---|
660 | _opnvol() -- open a volume
|
---|
661 | =============================================================================
|
---|
662 | */
|
---|
663 |
|
---|
664 | int16_t _opnvol(void)
|
---|
665 | {
|
---|
666 | register int32_t drc;
|
---|
667 |
|
---|
668 | /* check for media change if we already have a BPB */
|
---|
669 |
|
---|
670 | if (_bpbin) {
|
---|
671 |
|
---|
672 | drc = BIOS(B_MCHG, 0);
|
---|
673 |
|
---|
674 | #if DEBUGIT
|
---|
675 | if (fsdebug) {
|
---|
676 |
|
---|
677 | printf("_opnvol(): found _bpbin FALSE\n");
|
---|
678 | printf("_opnvol(): disk change test returned %ld\n", drc);
|
---|
679 | }
|
---|
680 | #endif
|
---|
681 |
|
---|
682 | if (drc)
|
---|
683 | _bpbin = FALSE;
|
---|
684 | } else {
|
---|
685 |
|
---|
686 | #if DEBUGIT
|
---|
687 | if (fsdebug)
|
---|
688 | printf("_opnvol(): found _bpbin FALSE\n");
|
---|
689 | #endif
|
---|
690 |
|
---|
691 | }
|
---|
692 |
|
---|
693 | if (!_bpbin) { /* access the BPB */
|
---|
694 |
|
---|
695 | _fatin = FALSE; /* invalidate the FAT and directory */
|
---|
696 | _dirin = FALSE;
|
---|
697 |
|
---|
698 | if ((struct bpb *)0L EQ (_thebpb = BIOS(B_GBPB, 0))) {
|
---|
699 |
|
---|
700 | errno = EIO; /* couldn't read the BPB */
|
---|
701 | return(FAILURE);
|
---|
702 | }
|
---|
703 |
|
---|
704 | _bpbin = TRUE;
|
---|
705 | }
|
---|
706 |
|
---|
707 | if (!_fatin) { /* access the FAT */
|
---|
708 |
|
---|
709 | _dirin = FALSE;
|
---|
710 |
|
---|
711 | if (_rdfat(_thefat, _thebpb) < 0) {
|
---|
712 |
|
---|
713 | errno = EIO; /* couldn't read either FAT */
|
---|
714 | return(FAILURE);
|
---|
715 | }
|
---|
716 |
|
---|
717 | _fatin = TRUE;
|
---|
718 | _fatmod = FALSE;
|
---|
719 | }
|
---|
720 | /* |
---|
721 |
|
---|
722 | */
|
---|
723 | if (!_dirin) { /* access the root directory */
|
---|
724 |
|
---|
725 | if (_rdroot(_thedir, _thebpb)) {
|
---|
726 |
|
---|
727 | errno = EIO; /* couldn't read the directory */
|
---|
728 | return(FAILURE);
|
---|
729 | }
|
---|
730 |
|
---|
731 | _dirin = TRUE;
|
---|
732 | _dirmod = FALSE;
|
---|
733 | }
|
---|
734 |
|
---|
735 | return(SUCCESS);
|
---|
736 | }
|
---|
737 |
|
---|
738 | /* |
---|
739 |
|
---|
740 | */
|
---|
741 |
|
---|
742 | /*
|
---|
743 | =============================================================================
|
---|
744 | _opfcb(fcp) -- open the FCB pointed to by 'fcp'. Returns 0 if
|
---|
745 | opened successfully, -1 if an error occurred, with the error code
|
---|
746 | in errno.
|
---|
747 | =============================================================================
|
---|
748 | */
|
---|
749 |
|
---|
750 | int16_t _opfcb(struct fcb *fcp)
|
---|
751 | {
|
---|
752 | int16_t rc;
|
---|
753 |
|
---|
754 | /* check for an already open FCB */
|
---|
755 |
|
---|
756 | if (fcp->modefl & FC_OPN) {
|
---|
757 |
|
---|
758 | errno = EINVAL;
|
---|
759 | return(IO_ERR);
|
---|
760 | }
|
---|
761 |
|
---|
762 | if (_opnvol()) { /* open the volume */
|
---|
763 |
|
---|
764 | _deadio(fcp, errno);
|
---|
765 | return(IO_ERR);
|
---|
766 | }
|
---|
767 |
|
---|
768 | /* search the directory for the file */
|
---|
769 |
|
---|
770 | if (DE_NULL EQ (_dptr = _dsrch(&fcp->de))) {
|
---|
771 |
|
---|
772 | /* file doesn't exist -- see if we should create it */
|
---|
773 |
|
---|
774 | if (!(fcp->modefl & FC_CR)) {
|
---|
775 |
|
---|
776 | _deadio(fcp, ENOENT); /* file nonexistant, not creating one */
|
---|
777 | return(IO_ERR);
|
---|
778 | }
|
---|
779 |
|
---|
780 | /* create the file */
|
---|
781 |
|
---|
782 | if(rc = _fmake(fcp)) {
|
---|
783 |
|
---|
784 | _deadio(fcp, EIO); /* couldn't create the file */
|
---|
785 | return(IO_ERR);
|
---|
786 | }
|
---|
787 |
|
---|
788 | /* |
---|
789 |
|
---|
790 | */
|
---|
791 |
|
---|
792 | } else {
|
---|
793 |
|
---|
794 | /* file exists -- check for writes to a read-only file */
|
---|
795 |
|
---|
796 | if ( (fcp->de.atrib & F_RDONLY) AND
|
---|
797 | (fcp->modefl & (FC_AP | FC_WR | FC_TR)) ) {
|
---|
798 |
|
---|
799 | /* can't append, write or truncate RO files */
|
---|
800 |
|
---|
801 | _deadio(fcp, EACCES);
|
---|
802 | return(IO_ERR);
|
---|
803 | }
|
---|
804 |
|
---|
805 | /* check for append and not write */
|
---|
806 |
|
---|
807 | if ((fcp->modefl & FC_AP) AND !(fcp->modefl & FC_WR)) {
|
---|
808 |
|
---|
809 | /* can't append if not open to write */
|
---|
810 |
|
---|
811 | _deadio(fcp, EACCES);
|
---|
812 | return(IO_ERR);
|
---|
813 | }
|
---|
814 |
|
---|
815 | /* check for create and exclusive with extant file */
|
---|
816 |
|
---|
817 | if ((fcp->modefl & FC_CR) AND (fcp->modefl & FC_EX)) {
|
---|
818 |
|
---|
819 | /* file exists and open was create-exclusive */
|
---|
820 |
|
---|
821 | _deadio(fcp, EEXIST);
|
---|
822 | return(IO_ERR);
|
---|
823 | }
|
---|
824 |
|
---|
825 | /* |
---|
826 |
|
---|
827 | */
|
---|
828 |
|
---|
829 | /* truncate the file if requested */
|
---|
830 |
|
---|
831 | if (fcp->modefl & FC_TR) {
|
---|
832 |
|
---|
833 | /* see if we can write */
|
---|
834 |
|
---|
835 | if (fcp->modefl & FC_WR) {
|
---|
836 |
|
---|
837 | /* truncate the file */
|
---|
838 |
|
---|
839 | if (_ftrnc(_dptr)) {
|
---|
840 |
|
---|
841 | _deadio(fcp, EIO); /* truncation failed */
|
---|
842 | return(IO_ERR);
|
---|
843 | }
|
---|
844 |
|
---|
845 | } else {
|
---|
846 |
|
---|
847 | /* we can't write, so we can't truncate */
|
---|
848 |
|
---|
849 | _deadio(fcp, EACCES);
|
---|
850 | return(IO_ERR);
|
---|
851 | }
|
---|
852 | }
|
---|
853 | }
|
---|
854 |
|
---|
855 | /* setup the FCB fields */
|
---|
856 |
|
---|
857 | memcpy(&fcp->de, _dptr, DENTSIZE);
|
---|
858 | fcp->clsec = 0;
|
---|
859 | fcp->curcls = micons(fcp->de.bclust);
|
---|
860 | fcp->offset = 0;
|
---|
861 | fcp->curlsn = 0L;
|
---|
862 | fcp->curdsn = fcp->de.bclust ? _cl2lsn(_thebpb, fcp->curcls) : 0;
|
---|
863 | fcp->curlen = miconl(fcp->de.flen);
|
---|
864 |
|
---|
865 | fcp->asects = ((fcp->curlen / _thebpb->clsizb)
|
---|
866 | + ((fcp->curlen & (_thebpb->clsizb - 1)) ? 1 : 0))
|
---|
867 | * _thebpb->clsiz;
|
---|
868 |
|
---|
869 | fcp->modefl &= ~(FC_EOF | FC_BAD | FC_ERR);
|
---|
870 | fcp->modefl |= FC_OPN;
|
---|
871 |
|
---|
872 | #if DEBUGIT
|
---|
873 | if (fsdebug)
|
---|
874 | SnapFCB(fcp);
|
---|
875 | #endif
|
---|
876 |
|
---|
877 | return(IO_OK);
|
---|
878 | }
|
---|
879 |
|
---|
880 | /* |
---|
881 |
|
---|
882 | */
|
---|
883 |
|
---|
884 | /*
|
---|
885 | =============================================================================
|
---|
886 | _inifcb(fcp, name, ext, mode) -- initialize FCB pointed to by 'fcp'
|
---|
887 | for file named 'name'.'ext' in mode 'mode'.
|
---|
888 | Returns SUCCESS (0) if ok, FAILURE (-1) if not.
|
---|
889 | =============================================================================
|
---|
890 | */
|
---|
891 |
|
---|
892 | int16_t _inifcb(struct fcb *fcp, int8_t *name, int8_t *ext, int16_t mode)
|
---|
893 | {
|
---|
894 | int16_t fl;
|
---|
895 | register int16_t i;
|
---|
896 | register int8_t *s1, *s2, c;
|
---|
897 |
|
---|
898 | /* clear the FCB */
|
---|
899 |
|
---|
900 | memset((int8_t *)fcp, 0, sizeof (struct fcb));
|
---|
901 |
|
---|
902 | /* check for valid flags */
|
---|
903 |
|
---|
904 | if (mode & ~(O_WRONLY|O_RDWR|O_NDELAY|O_APPEND|O_CREAT|O_TRUNC|O_EXCL|O_RAW))
|
---|
905 | return(FAILURE);
|
---|
906 |
|
---|
907 | /* |
---|
908 |
|
---|
909 | */
|
---|
910 | /* check the file name for length */
|
---|
911 |
|
---|
912 | fl = TRUE;
|
---|
913 | s1 = name;
|
---|
914 |
|
---|
915 | for (i = 0; i < 9; i++)
|
---|
916 | if (*s1++ EQ '\0') {
|
---|
917 |
|
---|
918 | fl = FALSE;
|
---|
919 | break;
|
---|
920 | }
|
---|
921 |
|
---|
922 | if (fl)
|
---|
923 | return(FAILURE);
|
---|
924 |
|
---|
925 | /* check the file name extension for length */
|
---|
926 |
|
---|
927 | fl = TRUE;
|
---|
928 | s1 = ext;
|
---|
929 |
|
---|
930 | for (i = 0; i <4; i++)
|
---|
931 | if (*s1++ EQ '\0') {
|
---|
932 |
|
---|
933 | fl = FALSE;
|
---|
934 | break;
|
---|
935 | }
|
---|
936 |
|
---|
937 | if (fl)
|
---|
938 | return(FAILURE);
|
---|
939 |
|
---|
940 | /* |
---|
941 |
|
---|
942 | */
|
---|
943 | /* clear the file name and extension in the FCB to blanks */
|
---|
944 |
|
---|
945 | memset(fcp->de.fname, ' ', 11);
|
---|
946 |
|
---|
947 | /* move the file name into the FCB */
|
---|
948 |
|
---|
949 | s1 = fcp->de.fname;
|
---|
950 | s2 = name;
|
---|
951 |
|
---|
952 | for (i = 0; i < 8; i++) {
|
---|
953 |
|
---|
954 | c = *s2++;
|
---|
955 |
|
---|
956 | if ((c EQ '\0') OR (c EQ ' '))
|
---|
957 | break;
|
---|
958 |
|
---|
959 | *s1++ = c;
|
---|
960 | }
|
---|
961 |
|
---|
962 | /* move the file name extension into the FCB */
|
---|
963 |
|
---|
964 | s1 = fcp->de.fext;
|
---|
965 | s2 = ext;
|
---|
966 |
|
---|
967 | for (i = 0; i < 3; i++) {
|
---|
968 |
|
---|
969 | c = *s2++;
|
---|
970 |
|
---|
971 | if ((c EQ '\0') OR (c EQ ' '))
|
---|
972 | break;
|
---|
973 |
|
---|
974 | *s1++ = c;
|
---|
975 | }
|
---|
976 |
|
---|
977 | /* |
---|
978 |
|
---|
979 | */
|
---|
980 |
|
---|
981 | /* set the flags in the FCB and exit */
|
---|
982 |
|
---|
983 | if (mode & O_RDONLY)
|
---|
984 | fcp->modefl |= FC_RD;
|
---|
985 |
|
---|
986 | if (mode & O_WRONLY)
|
---|
987 | fcp->modefl |= FC_WR;
|
---|
988 |
|
---|
989 | if (mode & O_RDWR)
|
---|
990 | fcp->modefl |= FC_RW;
|
---|
991 |
|
---|
992 | if (mode & O_NDELAY)
|
---|
993 | fcp->modefl |= FC_NB;
|
---|
994 |
|
---|
995 | if (mode & O_APPEND)
|
---|
996 | fcp->modefl |= FC_AP;
|
---|
997 |
|
---|
998 | if (mode & O_CREAT)
|
---|
999 | fcp->modefl |= FC_CR;
|
---|
1000 |
|
---|
1001 | if (mode & O_TRUNC)
|
---|
1002 | fcp->modefl |= FC_TR;
|
---|
1003 |
|
---|
1004 | if (mode & O_EXCL)
|
---|
1005 | fcp->modefl |= FC_EX;
|
---|
1006 |
|
---|
1007 | if (mode & O_RAW)
|
---|
1008 | fcp->modefl |= FC_BF;
|
---|
1009 |
|
---|
1010 | return(SUCCESS);
|
---|
1011 | }
|
---|
1012 |
|
---|
1013 | /* |
---|
1014 |
|
---|
1015 | */
|
---|
1016 |
|
---|
1017 | /*
|
---|
1018 | =============================================================================
|
---|
1019 | ClsFile() -- Closes the file controlled by the FCB pointed to by 'fcp'
|
---|
1020 | at the bios level.
|
---|
1021 | =============================================================================
|
---|
1022 | */
|
---|
1023 |
|
---|
1024 | int16_t ClsFile(struct fcb *fcp)
|
---|
1025 | {
|
---|
1026 | register struct dirent *dp;
|
---|
1027 |
|
---|
1028 | #if DEBUGIT
|
---|
1029 | if (fsdebug) {
|
---|
1030 |
|
---|
1031 | printf("ClsFile($%08lX): closing file\n", fcp);
|
---|
1032 | SnapFCB(fcp);
|
---|
1033 | }
|
---|
1034 | #endif
|
---|
1035 |
|
---|
1036 | if (fcp->modefl & FC_OPN) { /* is it open ? */
|
---|
1037 |
|
---|
1038 | if (fcp->modefl & (FC_CR | FC_AP | FC_WR)) { /* writing ? */
|
---|
1039 |
|
---|
1040 | if (dp = _dsrch(&fcp->de)) { /* locate the dirent */
|
---|
1041 |
|
---|
1042 | /* update the directory entry if it changed */
|
---|
1043 |
|
---|
1044 | if (memcmp(dp, &fcp->de, DENTSIZE)) {
|
---|
1045 |
|
---|
1046 | memcpy(dp, &fcp->de, DENTSIZE);
|
---|
1047 | _dirmod = TRUE;
|
---|
1048 | #if DEBUGIT
|
---|
1049 | if (fsdebug) {
|
---|
1050 |
|
---|
1051 | printf("ClsFile(): updated the directory. FAT:\n");
|
---|
1052 | mdump(_thefat, (char *)_thefat+127, _thefat);
|
---|
1053 | }
|
---|
1054 | #endif
|
---|
1055 |
|
---|
1056 | }
|
---|
1057 |
|
---|
1058 | /* |
---|
1059 |
|
---|
1060 | */
|
---|
1061 |
|
---|
1062 | } else {
|
---|
1063 |
|
---|
1064 | #if DEBUGIT
|
---|
1065 | if (fsdebug)
|
---|
1066 | printf("ClsFile(): ERROR - can't find the directory entry\n");
|
---|
1067 | #endif
|
---|
1068 |
|
---|
1069 | errno = EIO; /* can't find the entry */
|
---|
1070 | return(FAILURE);
|
---|
1071 | }
|
---|
1072 | }
|
---|
1073 |
|
---|
1074 | #if DEBUGIT
|
---|
1075 | if (fsdebug)
|
---|
1076 | SnapFCB(fcp);
|
---|
1077 | #endif
|
---|
1078 |
|
---|
1079 | return(SUCCESS);
|
---|
1080 |
|
---|
1081 | } else { /* not open */
|
---|
1082 |
|
---|
1083 | #if DEBUGIT
|
---|
1084 | if (fsdebug)
|
---|
1085 | printf("ClsFile(): ERROR - file not open\n");
|
---|
1086 | #endif
|
---|
1087 |
|
---|
1088 | errno = EINVAL;
|
---|
1089 | return(FAILURE);
|
---|
1090 | }
|
---|
1091 | }
|
---|
1092 |
|
---|
1093 | /* |
---|
1094 |
|
---|
1095 | */
|
---|
1096 |
|
---|
1097 | /*
|
---|
1098 | =============================================================================
|
---|
1099 | _clsvol() -- close the volume
|
---|
1100 | =============================================================================
|
---|
1101 | */
|
---|
1102 |
|
---|
1103 | void _clsvol(void)
|
---|
1104 | {
|
---|
1105 | if (_fatmod) {
|
---|
1106 |
|
---|
1107 | _clsfat();
|
---|
1108 |
|
---|
1109 | #if DEBUGIT
|
---|
1110 | if (fsdebug)
|
---|
1111 | printf("_clsvol(): modified FAT written\n");
|
---|
1112 | #endif
|
---|
1113 | }
|
---|
1114 |
|
---|
1115 | if (_dirmod) {
|
---|
1116 |
|
---|
1117 | _clsdir();
|
---|
1118 |
|
---|
1119 | #if DEBUGIT
|
---|
1120 | if (fsdebug)
|
---|
1121 | printf("_clsvol(): modified directory written\n");
|
---|
1122 | #endif
|
---|
1123 | }
|
---|
1124 |
|
---|
1125 | _bpbin = FALSE;
|
---|
1126 | _fatin = FALSE;
|
---|
1127 | _dirin = FALSE;
|
---|
1128 | }
|
---|
1129 |
|
---|
1130 | /*
|
---|
1131 | =============================================================================
|
---|
1132 | fcbinit() -- initialize an FCB
|
---|
1133 | =============================================================================
|
---|
1134 | */
|
---|
1135 |
|
---|
1136 | int16_t fcbinit(int8_t *name, struct fcb *fcp)
|
---|
1137 | {
|
---|
1138 | int8_t tmpname[9], tmpext[4];
|
---|
1139 |
|
---|
1140 | return(_inifcb(fcp, FilName(name, tmpname), FilExt(name, tmpext), 0));
|
---|
1141 | }
|
---|
1142 |
|
---|
1143 | /* |
---|
1144 |
|
---|
1145 | */
|
---|
1146 |
|
---|
1147 | /*
|
---|
1148 | =============================================================================
|
---|
1149 | DelFile() -- Deletes the file named by fcb pointed to by 'fcp'.
|
---|
1150 | =============================================================================
|
---|
1151 | */
|
---|
1152 |
|
---|
1153 | int16_t DelFile(struct fcb *fcp)
|
---|
1154 | {
|
---|
1155 | #if DEBUGIT
|
---|
1156 | if (fsdebug)
|
---|
1157 | printf("DelFile($%08.8lX): deleting [%-.8s].[%-.3s]\n",
|
---|
1158 | fcp, fcp->de.fname, fcp->de.fext);
|
---|
1159 | #endif
|
---|
1160 |
|
---|
1161 | if(_opnvol()) /* open the volume */
|
---|
1162 | return(FAILURE);
|
---|
1163 |
|
---|
1164 | if (DE_NULL EQ (_dptr = _dsrch(&fcp->de))) { /* find the file */
|
---|
1165 |
|
---|
1166 | errno = ENOENT; /* can't find the file */
|
---|
1167 | return(FAILURE);
|
---|
1168 | }
|
---|
1169 |
|
---|
1170 | if (_dptr->atrib & F_RDONLY) {
|
---|
1171 |
|
---|
1172 | errno = EACCES; /* can't delete an R/O file */
|
---|
1173 | return(FAILURE);
|
---|
1174 | }
|
---|
1175 |
|
---|
1176 | if (_ftrnc(_dptr)) /* truncate the file to free its space */
|
---|
1177 | return(FAILURE);
|
---|
1178 |
|
---|
1179 | _dptr->fname[0] = 0xE5; /* mark directory entry as free */
|
---|
1180 |
|
---|
1181 | #if DEBUGIT
|
---|
1182 | if (fsdebug)
|
---|
1183 | printf("DelFile($%08.8lX): file [%-.8s].[%-.3s] DELETED\n",
|
---|
1184 | fcp, fcp->de.fname, fcp->de.fext);
|
---|
1185 | #endif
|
---|
1186 |
|
---|
1187 | return(SUCCESS);
|
---|
1188 | }
|
---|
1189 |
|
---|