source: buchla-68k/libcio/readrn.c@ 298f0b4

Last change on this file since 298f0b4 was b28a12e, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Zero redundant declarations.
  • Property mode set to 100644
File size: 1.6 KB
Line 
1/*
2 =============================================================================
3 readrn.c -- read a random sector from a file
4 Version 8 -- 1987-12-15 -- D.N. Lynx Crowe
5
6 int
7 ReadRN(fcp, buf)
8 struct fcb *fcp;
9 char *buf;
10
11 Reads a sector from file 'fcp' into 'buf'. Seeks as needed.
12 Returns 0 if OK, -1 for errors, 1 for EOF (no data returned).
13 =============================================================================
14*/
15
16#define DEBUGIT 0
17
18#include "ram.h"
19
20/*
21 =============================================================================
22 ReadRN(fcp, buf) -- Reads a sector from file 'fcp' into 'buf'.
23 Seeks as needed. Returns SUCCESS (0) if OK, FAILURE (-1) for errors.
24 =============================================================================
25*/
26
27int16_t ReadRN(struct fcb *fcp, int8_t *buf)
28{
29 int16_t sv; /* seek return code */
30 int32_t brc; /* bios return code */
31
32 if (sv = _seek(fcp)) /* try to find the sector we want */
33 if (sv < 0) {
34
35 errno = EIO; /* I/O error */
36 return(-1); /* return: ERROR */
37
38 } else {
39
40 errno = EINVAL; /* invalid argument */
41 return(1); /* return: EOF */
42 }
43
44#if DEBUGIT
45 if (fsdebug)
46 printf("ReadRN(): curlsn=%ld, curdsn=%ld, offset=%u\n",
47 fcp->curlsn, fcp->curdsn, fcp->offset);
48#endif
49
50#if TBUFFER
51 if (brc = _secrd(buf, (int16_t)fcp->curdsn)) {
52#else
53 if (brc = BIOS(B_RDWR, 0, buf, 1, (short)fcp->curdsn, 0)) {
54#endif
55
56 _berrno = brc; /* log the error */
57 errno = EIO; /* ... as an I/O error */
58 return(FAILURE); /* return: ERROR */
59 }
60
61 return(SUCCESS); /* return: SUCCESS */
62}
63
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