Commit | Line | Data |
---|---|---|
586c39b1 | 1 | /* |
64022921 KB |
2 | * Copyright (c) 1983, 1987 Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
269a7923 | 5 | * %sccs.include.redist.c% |
586c39b1 DF |
6 | */ |
7 | ||
2ce81398 | 8 | #if defined(LIBC_SCCS) && !defined(lint) |
c5980113 | 9 | static char sccsid[] = "@(#)disklabel.c 5.17 (Berkeley) %G%"; |
64022921 | 10 | #endif /* LIBC_SCCS and not lint */ |
ae284747 | 11 | |
77118868 | 12 | #include <sys/param.h> |
90793b84 | 13 | #include <sys/errno.h> |
d0fa101e | 14 | #include <ufs/fs.h> |
77118868 MK |
15 | #include <sys/file.h> |
16 | #define DKTYPENAMES | |
17 | #include <sys/disklabel.h> | |
ae284747 | 18 | #include <stdio.h> |
6ebcb998 | 19 | #include <string.h> |
c5980113 DS |
20 | #include <stdlib.h> |
21 | #include <unistd.h> | |
ae284747 SL |
22 | |
23 | static char *dgetstr(); | |
c5980113 DS |
24 | static dgetent(); |
25 | static dnamatch(); | |
26 | static dgetnum(); | |
27 | static dgetflag(); | |
28 | static gettype(); | |
29 | static error(); | |
ae284747 | 30 | |
77118868 | 31 | struct disklabel * |
ae284747 | 32 | getdiskbyname(name) |
c5980113 | 33 | const char *name; |
ae284747 | 34 | { |
572daa42 MT |
35 | static struct disklabel disk; |
36 | static char boot[BUFSIZ]; | |
37 | char localbuf[BUFSIZ]; | |
38 | char buf[BUFSIZ]; | |
39 | char *cp, *cq; /* can't be register */ | |
77118868 | 40 | register struct disklabel *dp = &disk; |
8f13241a | 41 | register struct partition *pp; |
572daa42 MT |
42 | char p, max, psize[3], pbsize[3], |
43 | pfsize[3], poffset[3], ptype[3]; | |
44 | u_long *dx; | |
ae284747 SL |
45 | |
46 | if (dgetent(buf, name) <= 0) | |
77118868 MK |
47 | return ((struct disklabel *)0); |
48 | bzero((char *)&disk, sizeof(disk)); | |
572daa42 MT |
49 | /* |
50 | * typename | |
51 | */ | |
77118868 MK |
52 | cq = dp->d_typename; |
53 | cp = buf; | |
54 | while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && | |
55 | (*cq = *cp) && *cq != '|' && *cq != ':') | |
56 | cq++, cp++; | |
57 | *cq = '\0'; | |
572daa42 MT |
58 | /* |
59 | * boot name (optional) xxboot, bootxx | |
60 | */ | |
61 | cp = boot; | |
62 | dp->d_boot0 = dgetstr("b0", &cp); | |
63 | dp->d_boot1 = dgetstr("b1", &cp); | |
77118868 MK |
64 | cp = localbuf; |
65 | cq = dgetstr("ty", &cp); | |
66 | if (cq && strcmp(cq, "removable") == 0) | |
67 | dp->d_flags |= D_REMOVABLE; | |
68 | else if (cq && strcmp(cq, "simulated") == 0) | |
69 | dp->d_flags |= D_RAMDISK; | |
70 | if (dgetflag("sf")) | |
71 | dp->d_flags |= D_BADSECT; | |
572daa42 | 72 | |
77118868 MK |
73 | #define getnumdflt(field, dname, dflt) \ |
74 | { int f = dgetnum(dname); \ | |
75 | (field) = f == -1 ? (dflt) : f; } | |
76 | ||
77 | getnumdflt(dp->d_secsize, "se", DEV_BSIZE); | |
ae284747 SL |
78 | dp->d_ntracks = dgetnum("nt"); |
79 | dp->d_nsectors = dgetnum("ns"); | |
80 | dp->d_ncylinders = dgetnum("nc"); | |
77118868 MK |
81 | cq = dgetstr("dt", &cp); |
82 | if (cq) | |
83 | dp->d_type = gettype(cq, dktypenames); | |
84 | else | |
85 | getnumdflt(dp->d_type, "dt", 0); | |
86 | getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); | |
87 | getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); | |
88 | getnumdflt(dp->d_rpm, "rm", 3600); | |
89 | getnumdflt(dp->d_interleave, "il", 1); | |
90 | getnumdflt(dp->d_trackskew, "sk", 0); | |
91 | getnumdflt(dp->d_cylskew, "cs", 0); | |
92 | getnumdflt(dp->d_headswitch, "hs", 0); | |
93 | getnumdflt(dp->d_trkseek, "ts", 0); | |
94 | getnumdflt(dp->d_bbsize, "bs", BBSIZE); | |
95 | getnumdflt(dp->d_sbsize, "sb", SBSIZE); | |
8f13241a SL |
96 | strcpy(psize, "px"); |
97 | strcpy(pbsize, "bx"); | |
98 | strcpy(pfsize, "fx"); | |
77118868 MK |
99 | strcpy(poffset, "ox"); |
100 | strcpy(ptype, "tx"); | |
101 | max = 'a' - 1; | |
102 | pp = &dp->d_partitions[0]; | |
103 | for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { | |
104 | psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; | |
8f13241a | 105 | pp->p_size = dgetnum(psize); |
77118868 MK |
106 | if (pp->p_size == -1) |
107 | pp->p_size = 0; | |
108 | else { | |
109 | pp->p_offset = dgetnum(poffset); | |
110 | getnumdflt(pp->p_fsize, pfsize, 0); | |
111 | if (pp->p_fsize) | |
112 | pp->p_frag = dgetnum(pbsize) / pp->p_fsize; | |
113 | getnumdflt(pp->p_fstype, ptype, 0); | |
114 | if (pp->p_fstype == 0 && (cq = dgetstr(ptype, &cp))) | |
115 | pp->p_fstype = gettype(cq, fstypenames); | |
116 | max = p; | |
117 | } | |
118 | } | |
119 | dp->d_npartitions = max + 1 - 'a'; | |
6665218a | 120 | (void)strcpy(psize, "dx"); |
77118868 MK |
121 | dx = dp->d_drivedata; |
122 | for (p = '0'; p < '0' + NDDATA; p++, dx++) { | |
123 | psize[1] = p; | |
124 | getnumdflt(*dx, psize, 0); | |
ae284747 | 125 | } |
77118868 MK |
126 | dp->d_magic = DISKMAGIC; |
127 | dp->d_magic2 = DISKMAGIC; | |
ae284747 SL |
128 | return (dp); |
129 | } | |
130 | ||
131 | #include <ctype.h> | |
132 | ||
133 | static char *tbuf; | |
134 | static char *dskip(); | |
135 | static char *ddecode(); | |
136 | ||
137 | /* | |
138 | * Get an entry for disk name in buffer bp, | |
139 | * from the diskcap file. Parse is very rudimentary; | |
140 | * we just notice escaped newlines. | |
141 | */ | |
142 | static | |
143 | dgetent(bp, name) | |
144 | char *bp, *name; | |
145 | { | |
146 | register char *cp; | |
147 | register int c; | |
148 | register int i = 0, cnt = 0; | |
149 | char ibuf[BUFSIZ]; | |
150 | int tf; | |
151 | ||
152 | tbuf = bp; | |
90793b84 KB |
153 | tf = open(_PATH_DISKTAB, 0); |
154 | if (tf < 0) { | |
155 | error(errno); | |
ae284747 | 156 | return (-1); |
90793b84 | 157 | } |
ae284747 SL |
158 | for (;;) { |
159 | cp = bp; | |
160 | for (;;) { | |
161 | if (i == cnt) { | |
162 | cnt = read(tf, ibuf, BUFSIZ); | |
163 | if (cnt <= 0) { | |
90793b84 | 164 | error(errno); |
ae284747 SL |
165 | close(tf); |
166 | return (0); | |
167 | } | |
168 | i = 0; | |
169 | } | |
170 | c = ibuf[i++]; | |
171 | if (c == '\n') { | |
172 | if (cp > bp && cp[-1] == '\\'){ | |
173 | cp--; | |
174 | continue; | |
175 | } | |
176 | break; | |
177 | } | |
178 | if (cp >= bp+BUFSIZ) { | |
30681d11 | 179 | error(EFTYPE); |
ae284747 SL |
180 | break; |
181 | } else | |
182 | *cp++ = c; | |
183 | } | |
184 | *cp = 0; | |
185 | ||
186 | /* | |
187 | * The real work for the match. | |
188 | */ | |
189 | if (dnamatch(name)) { | |
190 | close(tf); | |
191 | return (1); | |
192 | } | |
193 | } | |
194 | } | |
195 | ||
196 | /* | |
197 | * Dnamatch deals with name matching. The first field of the disktab | |
198 | * entry is a sequence of names separated by |'s, so we compare | |
199 | * against each such name. The normal : terminator after the last | |
200 | * name (before the first field) stops us. | |
201 | */ | |
202 | static | |
203 | dnamatch(np) | |
204 | char *np; | |
205 | { | |
206 | register char *Np, *Bp; | |
207 | ||
208 | Bp = tbuf; | |
209 | if (*Bp == '#') | |
210 | return (0); | |
211 | for (;;) { | |
212 | for (Np = np; *Np && *Bp == *Np; Bp++, Np++) | |
213 | continue; | |
214 | if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0)) | |
215 | return (1); | |
216 | while (*Bp && *Bp != ':' && *Bp != '|') | |
217 | Bp++; | |
218 | if (*Bp == 0 || *Bp == ':') | |
219 | return (0); | |
220 | Bp++; | |
221 | } | |
222 | } | |
223 | ||
224 | /* | |
225 | * Skip to the next field. Notice that this is very dumb, not | |
226 | * knowing about \: escapes or any such. If necessary, :'s can be put | |
227 | * into the diskcap file in octal. | |
228 | */ | |
229 | static char * | |
230 | dskip(bp) | |
231 | register char *bp; | |
232 | { | |
233 | ||
234 | while (*bp && *bp != ':') | |
235 | bp++; | |
236 | if (*bp == ':') | |
237 | bp++; | |
238 | return (bp); | |
239 | } | |
240 | ||
241 | /* | |
242 | * Return the (numeric) option id. | |
243 | * Numeric options look like | |
244 | * li#80 | |
245 | * i.e. the option string is separated from the numeric value by | |
246 | * a # character. If the option is not found we return -1. | |
247 | * Note that we handle octal numbers beginning with 0. | |
248 | */ | |
249 | static | |
250 | dgetnum(id) | |
251 | char *id; | |
252 | { | |
253 | register int i, base; | |
254 | register char *bp = tbuf; | |
255 | ||
256 | for (;;) { | |
257 | bp = dskip(bp); | |
258 | if (*bp == 0) | |
259 | return (-1); | |
260 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
261 | continue; | |
262 | if (*bp == '@') | |
263 | return (-1); | |
264 | if (*bp != '#') | |
265 | continue; | |
266 | bp++; | |
267 | base = 10; | |
268 | if (*bp == '0') | |
269 | base = 8; | |
270 | i = 0; | |
271 | while (isdigit(*bp)) | |
272 | i *= base, i += *bp++ - '0'; | |
273 | return (i); | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * Handle a flag option. | |
279 | * Flag options are given "naked", i.e. followed by a : or the end | |
280 | * of the buffer. Return 1 if we find the option, or 0 if it is | |
281 | * not given. | |
282 | */ | |
283 | static | |
284 | dgetflag(id) | |
285 | char *id; | |
286 | { | |
287 | register char *bp = tbuf; | |
288 | ||
289 | for (;;) { | |
290 | bp = dskip(bp); | |
291 | if (!*bp) | |
292 | return (0); | |
293 | if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) { | |
294 | if (!*bp || *bp == ':') | |
295 | return (1); | |
296 | else if (*bp == '@') | |
297 | return (0); | |
298 | } | |
299 | } | |
300 | } | |
301 | ||
302 | /* | |
303 | * Get a string valued option. | |
304 | * These are given as | |
305 | * cl=^Z | |
306 | * Much decoding is done on the strings, and the strings are | |
307 | * placed in area, which is a ref parameter which is updated. | |
308 | * No checking on area overflow. | |
309 | */ | |
310 | static char * | |
311 | dgetstr(id, area) | |
312 | char *id, **area; | |
313 | { | |
314 | register char *bp = tbuf; | |
315 | ||
316 | for (;;) { | |
317 | bp = dskip(bp); | |
318 | if (!*bp) | |
319 | return (0); | |
320 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
321 | continue; | |
322 | if (*bp == '@') | |
323 | return (0); | |
324 | if (*bp != '=') | |
325 | continue; | |
326 | bp++; | |
327 | return (ddecode(bp, area)); | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * Tdecode does the grung work to decode the | |
333 | * string capability escapes. | |
334 | */ | |
335 | static char * | |
336 | ddecode(str, area) | |
337 | register char *str; | |
338 | char **area; | |
339 | { | |
340 | register char *cp; | |
341 | register int c; | |
342 | register char *dp; | |
343 | int i; | |
344 | ||
345 | cp = *area; | |
346 | while ((c = *str++) && c != ':') { | |
347 | switch (c) { | |
348 | ||
349 | case '^': | |
350 | c = *str++ & 037; | |
351 | break; | |
352 | ||
353 | case '\\': | |
354 | dp = "E\033^^\\\\::n\nr\rt\tb\bf\f"; | |
355 | c = *str++; | |
356 | nextc: | |
357 | if (*dp++ == c) { | |
358 | c = *dp++; | |
359 | break; | |
360 | } | |
361 | dp++; | |
362 | if (*dp) | |
363 | goto nextc; | |
364 | if (isdigit(c)) { | |
365 | c -= '0', i = 2; | |
366 | do | |
367 | c <<= 3, c |= *str++ - '0'; | |
368 | while (--i && isdigit(*str)); | |
369 | } | |
370 | break; | |
371 | } | |
372 | *cp++ = c; | |
373 | } | |
374 | *cp++ = 0; | |
375 | str = *area; | |
376 | *area = cp; | |
377 | return (str); | |
378 | } | |
77118868 MK |
379 | |
380 | static | |
381 | gettype(t, names) | |
382 | char *t; | |
383 | char **names; | |
384 | { | |
385 | register char **nm; | |
386 | ||
387 | for (nm = names; *nm; nm++) | |
49f0b7cf | 388 | if (strcasecmp(t, *nm) == 0) |
77118868 MK |
389 | return (nm - names); |
390 | if (isdigit(*t)) | |
391 | return (atoi(t)); | |
392 | return (0); | |
393 | } | |
394 | ||
90793b84 KB |
395 | static |
396 | error(err) | |
397 | int err; | |
398 | { | |
399 | char *p; | |
400 | ||
401 | (void)write(STDERR_FILENO, "disktab: ", 9); | |
402 | (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1); | |
403 | p = strerror(err); | |
404 | (void)write(STDERR_FILENO, p, strlen(p)); | |
405 | (void)write(STDERR_FILENO, "\n", 1); | |
406 | } |