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1.1 root 1: /*
2: * UAE - The Un*x Amiga Emulator
3: *
4: * Library of functions to make emulated filesystem as independent as
5: * possible of the host filesystem's capabilities.
6: *
7: * Copyright 1999 Bernd Schmidt
8: */
9:
10: #include "sysconfig.h"
11: #include "sysdeps.h"
12:
13: #include "config.h"
14: #include "threaddep/penguin.h"
15: #include "options.h"
16: #include "uae.h"
17: #include "memory.h"
18: #include "custom.h"
19: #include "newcpu.h"
20: #include "filesys.h"
21: #include "autoconf.h"
22: #include "compiler.h"
23: #include "fsusage.h"
24: #include "native2amiga.h"
25: #include "scsidev.h"
26: #include "fsdb.h"
27:
28: /* The on-disk format is as follows:
29: * Offset 0, 1 byte, valid
30: * Offset 1, 4 bytes, mode
31: * Offset 5, 257 bytes, aname
32: * Offset 263, 257 bytes, nname
33: * Offset 518, 81 bytes, comment
34: */
35:
36: char *nname_begin (char *nname)
37: {
38: char *p = strrchr (nname, FSDB_DIR_SEPARATOR);
39: if (p)
40: return p + 1;
41: return nname;
42: }
43:
44: /* Find the name REL in directory DIRNAME. If we find a file that
45: * has exactly the same name, return REL. If we find a file that
46: * has the same name when compared case-insensitively, return a
47: * malloced string that contains the name we found. If no file
48: * exists that compares equal to REL, return 0. */
49: char *fsdb_search_dir (const char *dirname, char *rel)
50: {
51: char *p = 0;
52: struct dirent *de;
53: DIR *dir = opendir (dirname);
54:
55: /* This really shouldn't happen... */
56: if (! dir)
57: return 0;
58:
59: while (p == 0 && (de = readdir (dir)) != 0) {
60: if (strcmp (de->d_name, rel) == 0)
61: p = rel;
62: else if (strcasecmp (de->d_name, rel) == 0)
63: p = my_strdup (de->d_name);
64: }
65: closedir (dir);
66: return p;
67: }
68:
69: static FILE *get_fsdb (a_inode *dir, const char *mode)
70: {
71: char *n = build_nname (dir->nname, FSDB_FILE);
72: FILE *f = fopen (n, mode);
73: free (n);
74: return f;
75: }
76:
77: /* Prune the db file the first time this directory is opened in a session. */
78: void fsdb_clean_dir (a_inode *dir)
79: {
80: char buf[1 + 4 + 257 + 257 + 81];
81: char *n = build_nname (dir->nname, FSDB_FILE);
82: FILE *f = fopen (n, "r+b");
83: off_t pos1 = 0, pos2 = 0;
84:
85: if (f == 0)
86: return;
87: for (;; pos2 += sizeof buf) {
88: if (fread (buf, 1, sizeof buf, f) < sizeof buf)
89: break;
90: if (buf[0] == 0)
91: continue;
92: if (pos1 != pos2) {
93: fseek (f, pos1, SEEK_SET);
94: fwrite (buf, 1, sizeof buf, f);
95: fseek (f, pos2 + sizeof buf, SEEK_SET);
96: }
97: pos1 += sizeof buf;
98: }
99: fclose (f);
100: truncate (n, pos1);
101: free (n);
102: }
103:
104: static a_inode *aino_from_buf (a_inode *base, char *buf)
105: {
106: uae_u32 mode;
107: a_inode *aino = (a_inode *) xmalloc (sizeof (a_inode));
108:
109: mode = do_get_mem_long ((uae_u32 *)(buf + 1));
110: buf += 5;
111: aino->aname = my_strdup (buf);
112: buf += 257;
113: aino->nname = build_nname (base->nname, buf);
114: buf += 257;
115: aino->comment = *buf != '\0' ? my_strdup (buf) : 0;
116: fsdb_fill_file_attrs (aino);
117: aino->amigaos_mode = mode;
118: aino->has_dbentry = 1;
119: aino->dirty = 0;
120: return aino;
121: }
122:
123: a_inode *fsdb_lookup_aino_aname (a_inode *base, const char *aname)
124: {
125: FILE *f = get_fsdb (base, "rb");
126: if (f == 0)
127: return 0;
128: for (;;) {
129: char buf[1 + 4 + 257 + 257 + 81];
130: if (fread (buf, 1, sizeof buf, f) < sizeof buf)
1.1.1.2 root 131: break;
1.1 root 132: if (buf[0] == 0)
133: continue;
134: if (same_aname (buf + 5, aname)) {
135: fclose (f);
136: return aino_from_buf (base, buf);
137: }
138: }
139: fclose (f);
140: return 0;
141: }
142:
143: a_inode *fsdb_lookup_aino_nname (a_inode *base, const char *nname)
144: {
145: char buf[1 + 4 + 257 + 257 + 81];
146: FILE *f = get_fsdb (base, "rb");
147: if (f == 0)
148: return 0;
149: for (;;) {
150: if (fread (buf, 1, sizeof buf, f) < sizeof buf)
1.1.1.2 root 151: break;
1.1 root 152: if (buf[0] == 0)
153: continue;
154: if (strcmp (buf + 5 + 257, nname) == 0) {
155: fclose (f);
156: return aino_from_buf (base, buf);
157: }
158: }
159: fclose (f);
160: return 0;
161: }
162:
163: int fsdb_used_as_nname (a_inode *base, const char *nname)
164: {
165: char buf[1 + 4 + 257 + 257 + 81];
166: FILE *f = get_fsdb (base, "rb");
167: if (f == 0)
168: return 0;
169: for (;;) {
170: if (fread (buf, 1, sizeof buf, f) < sizeof buf)
1.1.1.2 root 171: break;
1.1 root 172: if (buf[0] == 0)
173: continue;
174: if (strcmp (buf + 5 + 257, nname) == 0) {
175: fclose (f);
176: return 1;
177: }
178: }
179: fclose (f);
180: return 0;
181: }
182:
183: static int needs_dbentry (a_inode *aino)
184: {
185: const char *an_begin, *nn_begin;
186:
187: if (aino->deleted)
188: return 0;
189:
190: if (! fsdb_mode_representable_p (aino) || aino->comment != 0)
191: return 1;
192:
193: nn_begin = nname_begin (aino->nname);
194: return strcmp (nn_begin, aino->aname) != 0;
195: }
196:
197: static void write_aino (FILE *f, a_inode *aino)
198: {
199: char buf[1 + 4 + 257 + 257 + 81];
200: buf[0] = aino->needs_dbentry;
201: do_put_mem_long ((uae_u32 *)(buf + 1), aino->amigaos_mode);
202: strncpy (buf + 5, aino->aname, 256);
203: buf[5 + 256] = '\0';
204: strncpy (buf + 5 + 257, nname_begin (aino->nname), 256);
205: buf[5 + 257 + 256] = '\0';
206: strncpy (buf + 5 + 2*257, aino->comment ? aino->comment : "", 80);
207: buf[5 + 2 * 257 + 80] = '\0';
208: fwrite (buf, 1, sizeof buf, f);
209: aino->has_dbentry = aino->needs_dbentry;
210: }
211:
212: void fsdb_dir_writeback (a_inode *dir)
213: {
214: FILE *f;
215: int changes_needed = 0;
216: a_inode *aino;
217:
218: /* First pass: clear dirty bits where unnecessary, and see if any work
219: * needs to be done. */
220: for (aino = dir->child; aino; aino = aino->sibling) {
221: if (! aino->dirty)
222: continue;
223: aino->needs_dbentry = needs_dbentry (aino);
1.1.1.2 root 224: if (! aino->needs_dbentry)
1.1 root 225: aino->dirty = 0;
1.1.1.2 root 226: else
227: changes_needed = 1;
1.1 root 228: }
229: if (! changes_needed)
230: return;
231:
232: f = get_fsdb (dir, "r+b");
233: if (f == 0) {
234: f = get_fsdb (dir, "w+b");
235: if (f == 0)
236: /* This shouldn't happen... */
237: return;
238: }
239:
240: for (aino = dir->child; aino; aino = aino->sibling) {
241: off_t pos;
242:
243: if (! aino->dirty)
244: continue;
245: aino->dirty = 0;
246: if (! aino->has_dbentry) {
247: fseek (f, 0, SEEK_END);
248: write_aino (f, aino);
249: continue;
250: }
251:
252: fseek (f, 0, SEEK_SET);
253: pos = 0;
254: for (;;) {
255: char buf[1 + 4 + 257 + 257 + 81];
256: if (fread (buf, 1, sizeof buf, f) < sizeof buf)
257: /* Can't happen... */
258: break;
259: if (strcmp (buf + 5, aino->aname) == 0) {
260: fseek (f, pos, SEEK_SET);
261: write_aino (f, aino);
262: break;
263: }
264: pos += sizeof buf;
265: }
266: }
267: fclose (f);
268: }
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