source: buchla-68k/libcio/write.c@ e877e55

Last change on this file since e877e55 was b28a12e, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Zero redundant declarations.
  • Property mode set to 100644
File size: 5.0 KB
Line 
1/*
2 ============================================================================
3 write.c -- write() and friends
4 Version 17 -- 1987-10-27 -- D.N. Lynx Crowe
5 ============================================================================
6*/
7
8#define DEBUGIT 0
9
10#include "ram.h"
11
12static int16_t (*wr_tab[])() = { /* write routine dispatch table */
13
14 _badfd, /* 0 - invalid entry */
15 _filewr, /* 1 - disk file */
16 _conwr /* 2 - console device */
17};
18
19/*
20
21*/
22
23/*
24 ============================================================================
25 _putsec(fp, buf, len) -- write 'len' bytes from 'buf' on file 'fp'
26 ============================================================================
27*/
28
29int16_t _putsec(struct fcb *fp, int8_t *buf, uint16_t len)
30{
31#if DEBUGIT
32 if (fsdebug)
33 printf("_putsec($%08lX, $%08lx, %d): initial curlsn=%ld\n",
34 fp, buf, len, fp->curlsn);
35#endif
36
37 if ((errno = ReadRN(fp, Wrkbuf)) EQ 1) { /* try to read sector */
38
39#if DEBUGIT
40 if (fsdebug)
41 printf("_putsec(): ReadRN saw EOF at curlsn=%ld, asects=%ld\n",
42 fp->curlsn, fp->asects);
43#endif
44
45 errno = 0; /* we're at EOF */
46 memset(Wrkbuf, 0x1A, BPSEC); /* pad end of sector */
47
48 } else if (errno)
49 return(FAILURE);
50
51 memcpy(Wrkbuf + fp->offset, buf, len); /* move in the new data */
52
53 if ((errno = WriteRN(fp, Wrkbuf)) NE 0) { /* write the sector */
54
55#if DEBUGIT
56 if (fsdebug)
57 printf("_putsec(): WriteRN() FAILED (%d) - curlsn=%ld\n",
58 errno, fp->curlsn);
59#endif
60
61 return(FAILURE);
62 }
63
64 if ((fp->offset = (fp->offset + len) & (BPSEC - 1)) EQ 0) {
65
66 ++fp->curlsn; /* update file position */
67
68 if (_seek(fp) < 0) {
69
70#if DEBUGIT
71 if (fsdebug)
72 printf("_putsec(): _seek() failed - curlsn=%ld, asects=%ld\n",
73 fp->curlsn, fp->asects);
74#endif
75
76 return(FAILURE);
77 }
78 }
79
80#if DEBUGIT
81 if (fsdebug)
82 printf("_putsec(): final curlsn=%ld, offset=%d, len=%d\n",
83 fp->curlsn, fp->offset, len);
84#endif
85
86 return(SUCCESS);
87}
88
89/*
90
91*/
92
93/*
94 ============================================================================
95 _filewr(fp, buffer, len) -- write 'len' bytes on file 'fp'
96 from 'buffer'.
97 ============================================================================
98*/
99
100int16_t _filewr(struct fcb *fp, int8_t *buffer, uint16_t len)
101{
102 register uint16_t j, k, l;
103 int16_t clustr;
104 register int32_t curpos;
105
106 curpos = fp->offset + (fp->curlsn << FILESHFT); /* get position */
107
108 if (fp->de.bclust EQ 0) { /* see if we need to allocate */
109
110#if DEBUGIT
111 if (fsdebug)
112 if (curpos)
113 printf("_filewr(): ERROR - bclust EQ 0 and curpos (%ld) NE 0\n",
114 curpos);
115#endif
116
117 if (0 EQ (clustr = _newcls())) { /* allocate a cluster */
118
119 errno = EIO;
120 return(len);
121 }
122
123 fp->de.bclust = micons(clustr); /* update FCB */
124 _ptcl12(_thefat, clustr, 0x0FF8); /* update FAT */
125 _fatmod = TRUE;
126 fp->curdsn = _cl2lsn(_thebpb, clustr); /* set curdsn */
127 fp->curcls = clustr;
128 fp->clsec = 0;
129 fp->asects = _thebpb->clsiz;
130#if DEBUGIT
131 if (fsdebug) {
132
133 printf("_filewr(): allocated initial cluster=%d, asects=%ld\n",
134 clustr, fp->asects);
135 SnapFCB(fp);
136 }
137#endif
138 }
139
140 l = 0; /* zero the length-written counter */
141
142#if DEBUGIT
143 if (fsdebug)
144 printf("_filewr(): init pos=%ld, len=%u, curcls=%u, offset=%u\n",
145 curpos, len, fp->curcls, fp->offset);
146#endif
147
148 if (fp->offset) { /* see if we have a partial sector to fill */
149
150 if ((l = (BPSEC - fp->offset)) > len)
151 l = len;
152
153 if (_putsec(fp, buffer, l)) /* fill up the sector */
154 return(-1);
155 }
156
157 if (k = (len - l) / BPSEC) { /* write out any full sectors */
158
159 if ((j = blkwr(fp, buffer + l, k)) NE 0) {
160
161 l += (k - j) * BPSEC; /* update amount written */
162
163 if ((curpos + l) > fp->curlen) /* udpate file length */
164 fp->de.flen = miconl(fp->curlen = curpos + l);
165
166#if DEBUGIT
167 if (fsdebug)
168 printf("_filewr(): ERROR - curlen=%ld, curlsn=%ld, curdsn=%ld\n",
169 fp->curlen, fp->curlsn, fp->curdsn);
170#endif
171
172 return(l);
173 }
174
175 l += k * BPSEC; /* update amount written */
176 }
177/*
178
179*/
180 if (l < len) { /* write out partial sector at end */
181
182 if (_putsec(fp, buffer + l, len - l)) {
183
184 if ((curpos + l) > fp->curlen) /* update file length */
185 fp->de.flen = miconl(fp->curlen = curpos + l);
186
187#if DEBUGIT
188 if (fsdebug)
189 printf("_filewr(): ERROR - curlen=%ld, curlsn=%ld, curdsn=%ld\n",
190 fp->curlen, fp->curlsn, fp->curdsn);
191#endif
192
193 return(l);
194 }
195 }
196
197 if ((curpos + len) > fp->curlen) /* update file length */
198 fp->de.flen = miconl(fp->curlen = curpos + len);
199
200#if DEBUGIT
201 if (fsdebug)
202 printf("_filewr(): final curlen=%ld, flen=$%08lX, curlsn=%ld, curdsn=%ld\n",
203 fp->curlen, fp->de.flen, fp->curlsn, fp->curdsn);
204#endif
205
206 return(len);
207}
208
209/*
210
211*/
212
213/*
214 ============================================================================
215 write(fd, buff, len) -- write 'len' bytes from 'buff' on file 'fd'
216 ============================================================================
217*/
218
219int16_t write(int16_t fd, int8_t *buff, uint16_t len)
220{
221 register struct channel *chp;
222
223 if ((fd < 0) OR (fd > MAXCHAN)) {
224
225 errno = EBADF;
226 return(-1);
227 }
228
229 chp = &chantab[fd];
230
231 return((*wr_tab[chp->c_write])(chp->c_arg, buff, len));
232}
233
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