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99
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1 FILE *fopen(name,mode)
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2 char *name,*mode;
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3 {FILE *fcbp;
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4 char *p;
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5 int rd,wt,cm;
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6 rd = wt = cm = 0;
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7 for ( p = mode; *p; p++ ) {
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8 switch ( *p ) {
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9 case 'r':
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10 rd = 1; break;
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11 case 'w':
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12 wt = 1; break;
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13 case 'c':
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14 cm = 1; break;
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15 default:
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16 return NULL;
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17 }
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18 }
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19 if ( !(rd ^ wt) ) return NULL;
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20 if ( rd ) return _open(name,cm);
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21 else return _create(name,cm);
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22 }
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23
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24 FILE *_open(name,cm)
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25 char *name;
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26 int cm;
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27 {FILE *fcbp;
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28 int i;
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29 for ( i = 0; i < NFILES; i++)
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30 if ( _fcbtbl[i] == NULL ) break;
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31 if ( i >= NFILES) return NULL;
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32 if ( (fcbp = malloc(FCBSIZE)) == NULL ) return NULL;
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33 if ( _setname(name,fcbp) == 0 ) return NULL;
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34 if ( FMS(fcbp,1) < 0 ) return NULL;
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35 fcbp[59] = cm ? 0 : 0xff;
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36 fcbp[60] = 0;
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37 return (_fcbtbl[i] = fcbp);
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38 }
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39
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40 FILE *_create(name,cm)
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41 char *name;
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42 int cm;
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43 {FILE *fcbp;
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44 int i;
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45 for ( i = 0; i < NFILES; i++)
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46 if ( _fcbtbl[i] == NULL ) break;
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47 if ( i >= NFILES) return NULL;
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48 if ( (fcbp = malloc(FCBSIZE)) == NULL ) return NULL;
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49 if ( _setname(name,fcbp) == 0 ) return NULL;
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50 if ( FMS(fcbp,2) < 0 )
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51 { if ( (fcbp[1] != 3) || (FMS(fcbp,12) < 0) ) return NULL;
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52 _setname(name,fcbp);
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53 if (FMS(fcbp,2) < 0) return NULL;
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54 }
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55 fcbp[15] = 0;
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56 fcbp[59] = cm ? 0 : 0xff;
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57 fcbp[60] = 0;
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58 return (_fcbtbl[i] = fcbp);
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59 }
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60
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61 fclose(fcbp)
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62 FILE *fcbp;
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63 {int i;
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64 for ( i = 0; i < NFILES; i++ )
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65 if ( fcbp == _fcbtbl[i] ) break;
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66 if ( i >= NFILES ) return EOF;
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67 _fcbtbl[i] = NULL;
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68 if ( (fcbp == STDIN) || (fcbp == STDOUT) || (fcbp == STDERR) ) return 0;
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69 if ( FMS(fcbp,4) < 0 ) return EOF;
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70 mfree(fcbp);
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71 return 0;
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72 }
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73
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74 _setname(name,fcbp)
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75 char *name;
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76 FILE *fcbp;
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77 {int i;
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78 while(isspace(*name)) ++name;
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79 if (isdigit(*name))
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80 { fcbp[3] = *name++ - '0';
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81 if (*name++ != '.') return 0;
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82 }
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83 else fcbp[3] = 0xff;
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84 for (i = 4; i < 15; ++i) fcbp[i] = 0;
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85 if (!isalpha(*name)) return -1;
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86 for (i = 4; i < 12; ++i)
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87 { if (!*name || (*name == '.')) break;
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88 fcbp[i] = *name++;
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89 }
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90 while (*name && (*name != '.')) ++name;
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91 if (*name == '.')
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92 { ++name;
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93 for (i = 12; i < 15; ++i)
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94 { if (!*name) break;
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95 fcbp[i] = *name++;
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96 }
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97 }
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98 return 1;
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99 }
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100
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101 fflush(fp)
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102 FILE *fp;
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103 { return 0;
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104 }
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105
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106 unlink(fname)
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107 char *fname;
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108 {char p[320];
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109 return ((_setname(fname,p) || FMS(p,12) < 0) ? -1 : 0);
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110 }
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111
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112 rename(s,t)
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113 char *s,*t;
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114 {char p[320];
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115 return ((_setname(s,p) || _setname(t,p+49) || FMS(p,13) < 0) ? -1 : 0);
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116 }
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