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comparison mc09/fileio2.txt @ 160:1a30cd6e5973

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move mc09 to top
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 05 Feb 2019 09:03:07 +0900
parents os9/mc09/fileio2.txt@92ed427b7f7d
children
comparison
equal deleted inserted replaced
159:1d574c5b3383 160:1a30cd6e5973
1 FILE *fopen(name,mode)
2 char *name,*mode;
3 {char *p;
4 int rd,wt,cm;
5 rd = wt = cm = 0;
6 for ( p = mode; *p; p++ ) {
7 switch ( *p ) {
8 case 'r':
9 rd = 1; break;
10 case 'w':
11 wt = 1; break;
12 case 'c':
13 cm = 1; break;
14 default:
15 return NULL;
16 }
17 }
18 if ( !(rd ^ wt) ) return NULL;
19 if ( rd ) return _open(name,cm);
20 else return _create(name,cm);
21 }
22
23 FILE *_open(name,cm)
24 char *name;
25 int cm;
26 {FILE *fp;
27 int i;
28 for ( i = 0; i < NFILES; i++)
29 if ( _fptbl[i] == NULL ) break;
30 if ( i >= NFILES) return NULL;
31 if ( (fp = malloc(FBSIZE)) == NULL ) return NULL;
32 if ( _setname(name,fp->_fcb) == 0 ) return NULL;
33 if ( FMS(fp->_fcb,1) < 0 ) return NULL;
34 fp->_fcb[59] = cm ? 0 : 0xff;
35 fp->_fcb[60] = 0;
36 return (_fptbl[i] = fp);
37 }
38
39 FILE *_create(name,cm)
40 char *name;
41 int cm;
42 {FILE *fp;
43 int i;
44 for ( i = 0; i < NFILES; i++)
45 if ( _fptbl[i] == NULL ) break;
46 if ( i >= NFILES) return NULL;
47 if ( (fp = malloc(FBSIZE)) == NULL ) return NULL;
48 if ( _setname(name,fp->_fcb) == 0 ) return NULL;
49 if ( FMS(fp->_fcb,2) < 0 )
50 { if ( (fp[1] != 3) || (FMS(fp->_fcb,12) < 0) ) return NULL;
51 _setname(name,fp->_fcb);
52 if (FMS(fp->_fcb,2) < 0) return NULL;
53 }
54 fp->_fcb[15] = 0;
55 fp->_fcb[59] = cm ? 0 : 0xff;
56 fp->_fcb[60] = 0;
57 return (_fptbl[i] = fp);
58 }
59
60 fclose(fp)
61 FILE *fp;
62 {int i;
63 for ( i = 0; i < NFILES; i++ )
64 if ( fp == _fptbl[i] ) break;
65 if ( i >= NFILES ) return EOF;
66 _fptbl[i] = NULL;
67 if ( (fp == STDIN) || (fp == STDOUT) || (fp == STDERR) ) return 0;
68 if ( fp->_fcb[2] == 2 ) fflush(fp);
69 if ( FMS(fp->_fcb,4) < 0 ) return EOF;
70 mfree(fp);
71 return 0;
72 }
73
74 _setname(name,fcbp)
75 char *name;
76 char *fcbp;
77 {int i;
78 while(isspace(*name)) ++name;
79 if (isdigit(*name))
80 { fcbp[3] = *name++ - '0';
81 if (*name++ != '.') return 0;
82 }
83 else fcbp[3] = 0xff;
84 for (i = 4; i < 15; ++i) fcbp[i] = 0;
85 if (!isalpha(*name)) return -1;
86 for (i = 4; i < 12; ++i)
87 { if (!*name || (*name == '.')) break;
88 fcbp[i] = *name++;
89 }
90 while (*name && (*name != '.')) ++name;
91 if (*name == '.')
92 { ++name;
93 for (i = 12; i < 15; ++i)
94 { if (!*name) break;
95 fcbp[i] = *name++;
96 }
97 }
98 return 1;
99 }
100
101 fflush(fp)
102 FILE *fp;
103 {int i;
104 if ( fp == STDIN ) return EOF;
105 if ( fp == STDOUT || fp == STDERR ) return 0;
106 if ( fp->_fcb[2] != 2 ) return EOF;
107 for ( i = 0; i < fp->_fbp; i++ ) FMS(fp->_fcb,0,fp->fcb[i]);
108 fp->_fbp = 0;
109 return 0;
110 }
111
112 unlink(fname)
113 char *fname;
114 {char p[320];
115 return ((_setname(fname,p) || FMS(p,12) < 0) ? -1 : 0);
116 }
117
118 rename(s,t)
119 char *s,*t;
120 {char p[320];
121 return ((_setname(s,p) || _setname(t,p+49) || FMS(p,13) < 0) ? -1 : 0);
122 }