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