1 | /*
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2 | ============================================================================
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3 | fsinit.c -- Initialize file system
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4 | Version 9 -- 1988-01-31 -- D.N. Lynx Crowe
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5 | ============================================================================
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6 | */
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7 |
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8 | #define _FS_DEF_ /* define so that stdio.h and io.h get things right */
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9 |
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10 | #include "biosdefs.h"
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11 | #include "errno.h"
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12 | #include "io.h"
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13 | #include "stdio.h"
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14 | #include "stddefs.h"
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15 |
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16 | extern int _bpbin, _dirin, _fatin, _dirmod, _fatmod;
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17 |
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18 | int _badfd(), _noper();
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19 |
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20 | char *Stdbufs; /* buffer chain pointer */
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21 |
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22 | char Wrkbuf[BPSEC]; /* sector work buffer */
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23 |
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24 | long Stdbuf[MAXDFILE][BUFSIZL]; /* standard buffers */
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25 |
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26 | FILE Cbuffs[NSTREAMS]; /* stream file control table */
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27 |
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28 | struct fcb _fcbtab[MAXDFILE]; /* fcb table */
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29 |
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30 | struct channel chantab[MAXCHAN]; /* channel table: relates fd's to devices */
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31 |
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32 | #if TBUFFER
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33 |
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34 | /* WARNING: this ONLY works for 512 byte sectors, 9 sectors per track */
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35 |
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36 | short _b_tbuf[9][256]; /* the track buffer */
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37 |
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38 | short _b_trak; /* current track */
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39 | short _b_side; /* current side */
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40 | short _b_sect; /* current sector */
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41 | short _b_tsec; /* current base sector of current track */
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42 |
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43 | #endif
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44 |
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45 | /* |
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46 |
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47 | */
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48 |
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49 | /*
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50 | ============================================================================
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51 | _badfd() -- set "bad fd" error
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52 | ============================================================================
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53 | */
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54 |
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55 | int
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56 | _badfd()
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57 | {
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58 | errno = EBADF; /* set bad fd code */
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59 | return(FAILURE); /* return with an error indication */
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60 | }
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61 |
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62 | /*
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63 | ============================================================================
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64 | _noper() -- null return with no error condition
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65 | ============================================================================
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66 | */
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67 |
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68 | int
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69 | _noper()
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70 | {
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71 | return(SUCCESS); /* return with a non-error indication */
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72 | }
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73 |
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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 | /*
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79 | ============================================================================
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80 | InitCH() -- Initialize chantab structure entry
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81 | ============================================================================
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82 | */
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83 |
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84 | InitCH(cp, rdi, wri, ioi, ski, cfp, charg)
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85 | register struct channel *cp;
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86 | char rdi, wri, ioi, ski;
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87 | int (*cfp)();
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88 | io_arg charg;
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89 | {
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90 | cp->c_read = rdi;
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91 | cp->c_write = wri;
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92 | cp->c_ioctl = ioi;
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93 | cp->c_seek = ski;
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94 | cp->c_close = cfp;
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95 | cp->c_arg = charg;
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96 | }
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97 |
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98 | /*
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99 | ============================================================================
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100 | Init_CB() -- Initialize Cbuff structure entry
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101 | ============================================================================
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102 | */
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103 |
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104 | Init_CB(fp, flags, unit, bufad, bufsize)
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105 | register FILE *fp;
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106 | char unit, flags;
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107 | long *bufad;
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108 | int bufsize;
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109 | {
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110 | fp->_bp = (char *)0L;
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111 | fp->_bend = (char *)0L;
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112 | fp->_buff = (char *)bufad;
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113 | fp->_flags = flags;
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114 | fp->_unit = unit;
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115 | fp->_bytbuf = 0;
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116 | fp->_buflen = bufsize;
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117 | };
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118 |
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119 | /* |
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120 |
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121 | */
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122 |
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123 | /*
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124 | ============================================================================
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125 | InitFS() -- Initialize file system
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126 | ============================================================================
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127 | */
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128 |
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129 | InitFS()
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130 | {
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131 | register int i;
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132 |
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133 | memset(_fcbtab, 0, sizeof _fcbtab); /* clear fcb table */
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134 | memsetw(Stdbuf, 0, sizeof Stdbuf / 2); /* clear buffers */
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135 |
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136 | Init_CB(stdin, _BUSY, 0, (char *)0L, BUFSIZ); /* stdin */
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137 | Init_CB(stdout, _BUSY, 1, (char *)0L, 1); /* stdout */
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138 | Init_CB(stderr, _BUSY, 2, (char *)0L, 1); /* stderr */
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139 |
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140 | for (i = 3; i < NSTREAMS; i++)
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141 | Init_CB(&Cbuffs[i], 0, 0, (char *)0L, 0);
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142 |
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143 | Stdbuf[0][0] = 0L; /* initialize the buffer list */
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144 |
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145 | for (i = 1; i < MAXDFILE; i++)
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146 | Stdbuf[i][0] = (long)Stdbuf[i-1];
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147 |
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148 | Stdbufs = Stdbuf[MAXDFILE-1];
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149 |
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150 | InitCH(&chantab[0], 2, 0, 1, 0, _noper, (io_arg)CON_DEV ); /* 0 - stdin */
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151 | InitCH(&chantab[1], 0, 2, 1, 0, _noper, (io_arg)CON_DEV ); /* 1 - stdout */
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152 | InitCH(&chantab[2], 0, 2, 1, 0, _noper, (io_arg)CON_DEV ); /* 2 - stderr */
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153 |
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154 | for (i = 3; i < MAXCHAN; i++) /* 3..MAXCHAN-1 - not preassigned */
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155 | InitCH(&chantab[i], 0, 0, 0, 0, _badfd, (io_arg)0L );
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156 |
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157 | _bpbin = FALSE; /* BPB isn't in memory */
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158 | _dirin = FALSE; /* directory isn't in memory */
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159 | _fatin = FALSE; /* FAT isn't in memory */
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160 | _fatmod = FALSE; /* FAT hasn't been changed */
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161 | _dirmod = FALSE; /* directory hasn't been changed */
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162 |
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163 | #if TBUFFER
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164 | _b_trak = -1; /* no track in the buffer */
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165 | _b_side = -1; /* ... */
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166 | #endif
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167 | }
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