usr/src/sys/stand.att/open.c

/*-
 * Copyright (c) 1982, 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.proprietary.c%
 *
 *      @(#)open.c      7.3 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/reboot.h>
#include <ufs/ufs/dir.h>
#include "saio.h"

int     firstopen;
u_int   opendev;                        /* last device opened */
extern u_int bootdev;

struct dirstuff {
        int loc;
        struct iob *io;
};

#ifndef SMALL
static ino_t dlook __P((char *, struct iob *, char *));
static int find __P((char *, struct iob *));
static int getdev __P((char *, int));
static int getunit __P((char *));
static struct direct *readdir __P((struct dirstuff *));
static int openi __P((int, struct iob *));
#endif

open(str, how)
        char *str;
        int how;
{
        static int firstopen = 1;
        register struct iob *file;
        register char *t;
        register int cnt;
        int fdesc, args[8], *argp;

        if (firstopen) {
                for (cnt = 0; cnt < SOPEN_MAX; cnt++)
                        iob[cnt].i_flgs = 0;
                firstopen = 0;
        }

        for (fdesc = 0;; fdesc++) {
                if (fdesc == SOPEN_MAX)
                        _stop("No more file slots");
                if (iob[fdesc].i_flgs == 0) {
                        file = &iob[fdesc];
                        file->i_flgs |= F_ALLOC;
                        file->i_adapt = file->i_ctlr = file->i_unit =
                            file->i_part = 0;
                        break;
                }
        }

        for (cnt = 0; cnt < sizeof(args)/sizeof(args[0]); args[cnt++] = 0);
#ifndef SMALL
        for (t = str; *t && *t != '/' && *t != ':' && *t != '('; ++t)
                if (isupper(*t))
                        *t = tolower(*t);
        switch(*t) {
        case '(':       /* type(adapt, ctlr, drive, partition)file */
                if ((file->i_dev = getdev(str, t - str)) == -1)
                        goto bad;
                for (argp = args + 4, cnt = 0; *t != ')'; ++cnt) {
                        for (++t; isspace(*t); ++t);
                        if (*t == ')')
                                break;
                        if (!isdigit(*t))
                                goto badspec;
                        *argp++ = atoi(t);
                        for (++t; isdigit(*t); ++t);
                        if (*t != ',' && *t != ')' || cnt == 4)
                                goto badspec;
                }
                for (++t; isspace(*t); ++t);
                argp -= 4;
                file->i_adapt = *argp++;
                file->i_ctlr = *argp++;
                file->i_unit = *argp++;
                file->i_part = *argp;
                break;
        case ':':       /* [A-Za-z]*[0-9]*[A-Za-z]:file */
                for (t = str; *t != ':' && !isdigit(*t); ++t);
                if ((file->i_dev = getdev(str, t - str)) == -1)
                        goto bad;
                if ((file->i_unit = getunit(t)) == -1)
                        goto bad;
                for (; isdigit(*t); ++t);
                if (*t >= 'a' && *t <= 'h')
                        file->i_part = *t++ - 'a';
                if (*t != ':') {
                        errno = EOFFSET;
                        goto badspec;
                }
                for (++t; isspace(*t); ++t);
                break;
        case '/':
        default:                /* default bootstrap unit and device */
#else
        {
#endif /* SMALL */
                file->i_dev = B_TYPE(bootdev);
                file->i_adapt = B_ADAPTOR(bootdev);
                file->i_ctlr = B_CONTROLLER(bootdev);
                file->i_unit = B_UNIT(bootdev);
                file->i_part = B_PARTITION(bootdev);
                t = str;
        }

        opendev = MAKEBOOTDEV(file->i_dev, file->i_adapt, file->i_ctlr,
            file->i_unit, file->i_part);

        if (errno = devopen(file))
                goto bad;

        if (*t == '\0') {
                file->i_flgs |= how + 1;
                file->i_cc = 0;
                file->i_offset = 0;
                return (fdesc+3);
        }
#ifndef SMALL
        else if (how != 0) {
                printf("Can't write files yet.. Sorry\n");
                errno = EIO;
                goto bad;
        }
#endif
        file->i_ma = (char *)(&file->i_fs);
        file->i_cc = SBSIZE;
        file->i_bn = SBOFF / DEV_BSIZE + file->i_boff;
        file->i_offset = 0;
        if (devread(file) < 0) {
                errno = file->i_error;
                printf("super block read error\n");
                goto bad;
        }
        if ((cnt = find(t, file)) == 0) {
                errno = ESRCH;
                goto bad;
        }
        if (openi(cnt, file) < 0) {
                errno = file->i_error;
                goto bad;
        }
        file->i_offset = 0;
        file->i_cc = 0;
        file->i_flgs |= F_FILE | (how+1);
        return (fdesc+3);

#ifndef SMALL
badspec:
        printf("malformed device specification\nusage: device(adaptor, controller, drive, partition)file -or- <device><unit><partitionletter>:<file>\n");
#endif
bad:
        file->i_flgs = 0;
        return (-1);
}

#ifndef SMALL
static
getdev(str, len)
        register char *str;
        int len;
{
        register struct devsw *dp;
        register int i;
        char savedch = str[len];

        str[len] = '\0';
        for (dp = devsw, i = 0; i < ndevs; dp++, i++)
                if (dp->dv_name && strcmp(str, dp->dv_name) == 0) {
                        str[len] = savedch;
                        return (i);
                }
        printf("Unknown device\nKnown devices are:\n");
        for (dp = devsw, i = 0; i < ndevs; dp++, i++)
                if (dp->dv_name)
                        printf(" %s", dp->dv_name);
        printf("\n");
        errno = ENXIO;
        return (-1);
}

static
getunit(cp)
        register char *cp;
{
        int unit;

        unit = atoi(cp);
        if ((u_int)unit > 255) {
                printf("minor device number out of range (0-255)\n");
                errno = EUNIT;
                return (-1);
        }
        return (unit);
}
#endif /* SMALL */

static
find(path, file)
        register char *path;
        struct iob *file;
{
        register char *q;
        char *dir, c;
        int n;

        if (path == NULL || *path == '\0') {
                printf("null path\n");
                return (0);
        }

        if (openi((ino_t) ROOTINO, file) < 0) {
                printf("can't read root inode\n");
                return (0);
        }
        dir = path;
        while (*path) {
                while (*path == '/')
                        path++;
                q = path;
                while(*q != '/' && *q != '\0')
                        q++;
                c = *q;
                *q = '\0';
                if (q == path) path = "." ;     /* "/" means "/." */

                if ((n = dlook(path, file, dir)) != 0) {
                        if (c == '\0')
                                break;
                        if (openi(n, file) < 0)
                                return (0);
                        *q = c;
                        path = q;
                        continue;
                } else {
                        printf("%s: not found\n", path);
                        return (0);
                }
        }
        return (n);
}

static ino_t
dlook(s, io, dir)
        char *s;
        register struct iob *io;
        char *dir;
{
        register struct direct *dp;
        register struct dinode *ip;
        struct dirstuff dirp;
        int len;

        if (s == NULL || *s == '\0')
                return (0);
        ip = &io->i_ino;
        if ((ip->di_mode&IFMT) != IFDIR) {
                printf("%s: not a directory\n", dir);
                return (0);
        }
        if (ip->di_size == 0) {
                printf("%s: zero length directory\n", dir);
                return (0);
        }
        len = strlen(s);
        dirp.loc = 0;
        dirp.io = io;
        for (dp = readdir(&dirp); dp != NULL; dp = readdir(&dirp)) {
                if(dp->d_ino == 0)
                        continue;
                if (dp->d_namlen == len && !strcmp(s, dp->d_name))
                        return (dp->d_ino);
        }
        return (0);
}

static struct direct *
readdir(dirp)
        register struct dirstuff *dirp;
{
        register struct direct *dp;
        register struct iob *io;
        daddr_t lbn, d;
        int off;

        io = dirp->io;
        for(;;) {
                if (dirp->loc >= io->i_ino.di_size)
                        return (NULL);
                off = blkoff(&io->i_fs, dirp->loc);
                if (off == 0) {
                        lbn = lblkno(&io->i_fs, dirp->loc);
                        d = bmap(io, lbn);
                        if(d == 0)
                                return (NULL);
                        io->i_bn = fsbtodb(&io->i_fs, d) + io->i_boff;
                        io->i_ma = io->i_buf;
                        io->i_cc = dblksize(&io->i_fs, &io->i_ino, lbn);
                        if (devread(io) < 0) {
                                errno = io->i_error;
                                printf("bn %ld: directory read error\n",
                                        io->i_bn);
                                return (NULL);
                        }
                }
                dp = (struct direct *)(io->i_buf + off);
                dirp->loc += dp->d_reclen;
                if (dp->d_ino == 0)
                        continue;
                return (dp);
        }
}

static
openi(n, io)
        int n;
        register struct iob *io;
{
        register struct dinode *dp;
        int cc;

        io->i_offset = 0;
        io->i_bn = fsbtodb(&io->i_fs, itod(&io->i_fs, n)) + io->i_boff;
        io->i_cc = io->i_fs.fs_bsize;
        io->i_ma = io->i_buf;
        cc = devread(io);
        dp = (struct dinode *)io->i_buf;
        io->i_ino = dp[itoo(&io->i_fs, n)];
        return (cc);
}