434 lines
9.7 KiB
C
434 lines
9.7 KiB
C
/*
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* Copyright (c) 1983, 1987 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)disklabel.c 5.17 (Berkeley) 2/23/91";*/
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static char *rcsid = "$Id: disklabel.c,v 1.5 1994/06/12 22:52:01 cgd Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <ufs/ffs/fs.h>
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#include <sys/file.h>
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#define DKTYPENAMES
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#include <sys/disklabel.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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static char *dgetstr();
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static int dgetent();
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static int dnamatch();
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static int dgetnum();
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static int dgetflag();
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static int gettype();
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static void error();
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struct disklabel *
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getdiskbyname(name)
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const char *name;
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{
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static struct disklabel disk;
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static char boot[BUFSIZ];
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char localbuf[BUFSIZ];
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char buf[BUFSIZ];
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char *cp, *cq; /* can't be register */
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register struct disklabel *dp = &disk;
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register struct partition *pp;
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char p, max, psize[3], pbsize[3],
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pfsize[3], poffset[3], ptype[3];
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u_long *dx;
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if (dgetent(buf, name) <= 0)
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return ((struct disklabel *)0);
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bzero((char *)&disk, sizeof(disk));
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/*
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* typename
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*/
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cq = dp->d_typename;
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cp = buf;
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while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
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(*cq = *cp) && *cq != '|' && *cq != ':')
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cq++, cp++;
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*cq = '\0';
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/*
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* boot name (optional) xxboot, bootxx
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*/
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cp = boot;
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dp->d_boot0 = dgetstr("b0", &cp);
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dp->d_boot1 = dgetstr("b1", &cp);
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cp = localbuf;
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cq = dgetstr("ty", &cp);
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if (cq && strcmp(cq, "removable") == 0)
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dp->d_flags |= D_REMOVABLE;
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else if (cq && strcmp(cq, "simulated") == 0)
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dp->d_flags |= D_RAMDISK;
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if (dgetflag("sf"))
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dp->d_flags |= D_BADSECT;
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#define getnumdflt(field, dname, dflt) \
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{ int f = dgetnum(dname); \
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(field) = f == -1 ? (dflt) : f; }
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getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
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dp->d_ntracks = dgetnum("nt");
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dp->d_nsectors = dgetnum("ns");
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dp->d_ncylinders = dgetnum("nc");
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cq = dgetstr("dt", &cp);
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if (cq)
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dp->d_type = gettype(cq, dktypenames);
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else
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getnumdflt(dp->d_type, "dt", 0);
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getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
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getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
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getnumdflt(dp->d_rpm, "rm", 3600);
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getnumdflt(dp->d_interleave, "il", 1);
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getnumdflt(dp->d_trackskew, "sk", 0);
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getnumdflt(dp->d_cylskew, "cs", 0);
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getnumdflt(dp->d_headswitch, "hs", 0);
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getnumdflt(dp->d_trkseek, "ts", 0);
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getnumdflt(dp->d_bbsize, "bs", BBSIZE);
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getnumdflt(dp->d_sbsize, "sb", SBSIZE);
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strcpy(psize, "px");
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strcpy(pbsize, "bx");
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strcpy(pfsize, "fx");
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strcpy(poffset, "ox");
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strcpy(ptype, "tx");
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max = 'a' - 1;
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pp = &dp->d_partitions[0];
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for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
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psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
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pp->p_size = dgetnum(psize);
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if (pp->p_size == -1)
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pp->p_size = 0;
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else {
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pp->p_offset = dgetnum(poffset);
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getnumdflt(pp->p_fsize, pfsize, 0);
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if (pp->p_fsize)
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pp->p_frag = dgetnum(pbsize) / pp->p_fsize;
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getnumdflt(pp->p_fstype, ptype, 0);
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if (pp->p_fstype == 0 && (cq = dgetstr(ptype, &cp)))
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pp->p_fstype = gettype(cq, fstypenames);
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max = p;
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}
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}
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dp->d_npartitions = max + 1 - 'a';
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(void)strcpy(psize, "dx");
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dx = dp->d_drivedata;
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for (p = '0'; p < '0' + NDDATA; p++, dx++) {
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psize[1] = p;
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getnumdflt(*dx, psize, 0);
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}
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dp->d_magic = DISKMAGIC;
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dp->d_magic2 = DISKMAGIC;
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return (dp);
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}
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#include <ctype.h>
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static char *tbuf;
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static char *dskip();
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static char *ddecode();
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/*
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* Get an entry for disk name in buffer bp,
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* from the diskcap file. Parse is very rudimentary;
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* we just notice escaped newlines.
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*/
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static int
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dgetent(bp, name)
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char *bp, *name;
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{
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register char *cp;
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register int c;
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register int i = 0, cnt = 0;
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char ibuf[BUFSIZ];
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int tf;
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tbuf = bp;
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tf = open(_PATH_DISKTAB, 0);
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if (tf < 0) {
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error(errno);
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return (-1);
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}
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for (;;) {
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cp = bp;
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for (;;) {
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if (i == cnt) {
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cnt = read(tf, ibuf, BUFSIZ);
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if (cnt <= 0) {
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error(errno);
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close(tf);
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return (0);
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}
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i = 0;
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}
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c = ibuf[i++];
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if (c == '\n') {
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if (cp > bp && cp[-1] == '\\'){
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cp--;
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continue;
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}
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break;
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}
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if (cp >= bp+BUFSIZ) {
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error(EFTYPE);
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break;
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} else
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*cp++ = c;
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}
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*cp = 0;
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/*
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* The real work for the match.
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*/
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if (dnamatch(name)) {
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close(tf);
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return (1);
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}
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}
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}
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/*
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* Dnamatch deals with name matching. The first field of the disktab
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* entry is a sequence of names separated by |'s, so we compare
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* against each such name. The normal : terminator after the last
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* name (before the first field) stops us.
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*/
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static int
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dnamatch(np)
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char *np;
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{
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register char *Np, *Bp;
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Bp = tbuf;
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if (*Bp == '#')
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return (0);
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for (;;) {
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for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
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continue;
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if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
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return (1);
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while (*Bp && *Bp != ':' && *Bp != '|')
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Bp++;
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if (*Bp == 0 || *Bp == ':')
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return (0);
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Bp++;
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}
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}
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/*
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* Skip to the next field. Notice that this is very dumb, not
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* knowing about \: escapes or any such. If necessary, :'s can be put
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* into the diskcap file in octal.
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*/
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static char *
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dskip(bp)
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register char *bp;
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{
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while (*bp && *bp != ':')
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bp++;
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if (*bp == ':')
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bp++;
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return (bp);
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}
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/*
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* Return the (numeric) option id.
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* Numeric options look like
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* li#80
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* i.e. the option string is separated from the numeric value by
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* a # character. If the option is not found we return -1.
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* Note that we handle octal numbers beginning with 0.
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*/
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static int
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dgetnum(id)
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char *id;
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{
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register int i, base;
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register char *bp = tbuf;
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for (;;) {
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bp = dskip(bp);
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if (*bp == 0)
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return (-1);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return (-1);
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if (*bp != '#')
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continue;
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bp++;
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base = 10;
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if (*bp == '0')
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base = 8;
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i = 0;
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while (isdigit(*bp))
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i *= base, i += *bp++ - '0';
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return (i);
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}
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}
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/*
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* Handle a flag option.
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* Flag options are given "naked", i.e. followed by a : or the end
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* of the buffer. Return 1 if we find the option, or 0 if it is
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* not given.
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*/
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static int
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dgetflag(id)
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char *id;
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{
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register char *bp = tbuf;
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for (;;) {
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bp = dskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
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if (!*bp || *bp == ':')
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return (1);
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else if (*bp == '@')
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return (0);
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}
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}
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}
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/*
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* Get a string valued option.
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* These are given as
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* cl=^Z
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* Much decoding is done on the strings, and the strings are
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* placed in area, which is a ref parameter which is updated.
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* No checking on area overflow.
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*/
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static char *
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dgetstr(id, area)
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char *id, **area;
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{
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register char *bp = tbuf;
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for (;;) {
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bp = dskip(bp);
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if (!*bp)
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return (0);
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if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
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continue;
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if (*bp == '@')
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return (0);
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if (*bp != '=')
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continue;
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bp++;
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return (ddecode(bp, area));
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}
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}
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/*
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* Tdecode does the grung work to decode the
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* string capability escapes.
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*/
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static char *
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ddecode(str, area)
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register char *str;
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char **area;
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{
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register char *cp;
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register int c;
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register char *dp;
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int i;
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cp = *area;
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while ((c = *str++) && c != ':') {
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switch (c) {
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case '^':
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c = *str++ & 037;
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break;
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case '\\':
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dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
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c = *str++;
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nextc:
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if (*dp++ == c) {
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c = *dp++;
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break;
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}
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dp++;
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if (*dp)
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goto nextc;
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if (isdigit(c)) {
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c -= '0', i = 2;
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do
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c <<= 3, c |= *str++ - '0';
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while (--i && isdigit(*str));
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}
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break;
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}
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*cp++ = c;
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}
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*cp++ = 0;
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str = *area;
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*area = cp;
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return (str);
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}
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static int
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gettype(t, names)
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char *t;
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char **names;
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{
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register char **nm;
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for (nm = names; *nm; nm++)
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if (strcasecmp(t, *nm) == 0)
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return (nm - names);
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if (isdigit(*t))
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return (atoi(t));
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return (0);
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}
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static void
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error(err)
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int err;
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{
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char *p;
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(void)write(STDERR_FILENO, "disktab: ", 9);
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(void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1);
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p = strerror(err);
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(void)write(STDERR_FILENO, p, strlen(p));
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(void)write(STDERR_FILENO, "\n", 1);
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}
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