source: buchla-68k/libcio/fsize.c@ 6262b5c

Last change on this file since 6262b5c was 6262b5c, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Added include files for global functions and variables.
  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 =============================================================================
3 fsize.c -- file size and disk capacity functions
4 Version 1 -- 1987-10-29 -- D.N. Lynx Crowe
5 =============================================================================
6*/
7
8#include "all.h"
9
10extern uint16_t _gtcl12(int8_t *fat, uint16_t cl);
11extern int16_t _opnvol(void);
12extern int16_t _filecl(struct fcb *fp);
13
14extern uint16_t _thefat[];
15
16extern struct bpb *_thebpb;
17
18/*
19 =============================================================================
20 fsize() -- return the current size of an open stream file
21
22 how = 0: in bytes, 1: in allocated clusters
23 =============================================================================
24*/
25
26int32_t fsize(FILE *fp, int16_t how)
27{
28 register struct channel *chp;
29 register struct fcb *fcp;
30
31 if (fp EQ (FILE *)0L)
32 return(-1L);
33
34 if (fp->_flags & _BUSY) {
35
36 chp = &chantab[fp->_unit];
37
38 if (chp->c_close NE _filecl)
39 return(-1L);
40
41 fcp = chp->c_arg;
42
43 if (fcp->modefl & FC_OPN) {
44
45 if (how)
46 return(fcp->asects);
47 else
48 return(fcp->curlen);
49
50 } else
51 return(-1L);
52
53 } else
54 return(-1L);
55}
56
57/*
58
59*/
60
61/*
62 =============================================================================
63 dspace() -- return disk capacity or usage
64
65 which = 0: capcity, 1: usage
66 =============================================================================
67*/
68
69int16_t dspace(int16_t which)
70{
71 register int16_t maxcl, clcount, nc;
72
73 if (_opnvol())
74 return(-1L);
75
76 maxcl = _thebpb->numcl;
77
78 if (which) {
79
80 clcount = 0;
81
82 for (nc = 2; nc < maxcl; nc++)
83 if (0 EQ _gtcl12(_thefat, nc))
84 ++clcount;
85
86 return(clcount);
87
88 } else {
89
90 return(maxcl);
91 }
92}
93
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