source: buchla-68k/libcio/writern.c@ 0580615

Last change on this file since 0580615 was 0580615, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Point of no return.
  • Property mode set to 100644
File size: 2.2 KB
Line 
1/*
2 =============================================================================
3 writern.c -- write a random sector onto a file
4 Version 6 -- 1987-12-15 -- D.N. Lynx Crowe
5
6 int
7 WriteRN(fcp, buf)
8 struct fcb *fcp;
9 char *buf;
10
11 Writes a sector onto file 'fcp' from 'buf'. Seeks as needed.
12 Returns SUCCESS (0) if OK, FAILURE (-1) for errors.
13 =============================================================================
14*/
15
16#define DEBUGIT 0
17
18#include "stddefs.h"
19#include "biosdefs.h"
20#include "errno.h"
21#include "errdefs.h"
22#include "fspars.h"
23
24extern long _berrno;
25extern int _seek(struct fcb *fcp);
26
27#if DEBUGIT
28extern short fsdebug;
29#endif
30
31#if TBUFFER
32extern long _secwr(char *buf, short rec);
33#endif
34
35/*
36
37*/
38
39/*
40 =============================================================================
41 WriteRN(fcp, buf) -- Writes a sector onto file 'fcp' from 'buf'.
42 Seeks as needed. Returns SUCCESS (0) if OK, FAILURE (-1) for errors.
43 =============================================================================
44*/
45
46int WriteRN(struct fcb *fcp, char *buf)
47{
48 int sv; /* seek return code */
49 long brc; /* bios return code */
50
51 if (sv = _seek(fcp)) { /* try to find the sector we want */
52
53 if (sv < 0) { /* seek error ? */
54
55#if DEBUGIT
56 if (fsdebug)
57 printf("WriteRN(): _seek FAILED (%d) - curlsn=%ld, curdsn=%ld\n",
58 sv, fcp->curlsn, fcp->curdsn);
59#endif
60
61 errno = EIO; /* I/O error or seek past EOF */
62 return(FAILURE);
63
64 } else if (sv EQ 2) { /* at hard EOF ? */
65
66 if (_alcnew(fcp)) { /* allocate a new cluster */
67
68 errno = EIO;
69 return(FAILURE);
70 }
71#if DEBUGIT
72 if (fsdebug)
73 printf("WriteRN(): cluster allocated - curcls=%d, clsec=%d\n",
74 fcp->curcls, fcp->clsec);
75#endif
76
77 }
78 }
79
80#if DEBUGIT
81 if (fsdebug)
82 printf("WriteRN(): curlsn=%ld, curdsn=%ld\n",
83 fcp->curlsn, fcp->curdsn);
84#endif
85
86 /* write the sector */
87
88 if (brc = BIOS(B_RDWR, 1, buf, 1, (short)fcp->curdsn, 0)) {
89
90#if DEBUGIT
91 if (fsdebug)
92 printf("WriteRN(): B_RDWR FAILED - brc=%ld\n", brc);
93#endif
94
95 _berrno = brc; /* log the error */
96 errno = EIO; /* ... as an I/O error */
97 return(FAILURE); /* return: ERROR */
98 }
99
100#if TBUFFER
101 _secwr(buf, (short)fcp->curdsn);
102#endif
103
104 return(SUCCESS); /* return: SUCCESS */
105}
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