[unix-history] / 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	7.6 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/reboot.h>

#include <ufs/ufs/dir.h>
#include <stand.att/saio.h>

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

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

#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;
	dirp.name = dir;
	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("%s: directory read error, bn %ld\n",
					dirp->name, io->i_bn);
				return (NULL);
			}
		}
		dp = (struct direct *)(io->i_buf + off);
		dirp->loc += dp->d_reclen;
		if (dp->d_ino == 0) {
			if (dp->d_reclen == 0) {
				printf("%s: bad directory entry, offset %ld\n",
				       dirp->name, dirp->loc);
				return (NULL);
			}
			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);
}
Commit	Line	Data
8a8c3c41 KB	1	/*-
	2	* Copyright (c) 1982, 1988 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.proprietary.c%
	6	*
61ef809e	7	* @(#)open.c 7.6 (Berkeley) %G%
8a8c3c41 KB	8	*/
	9
	10	#include <sys/param.h>
	11	#include <sys/reboot.h>
38a01dbe	12
d8c95a01	13	#include <ufs/ufs/dir.h>
61ef809e	14	#include <stand.att/saio.h>
8a8c3c41 KB	15
	16	int firstopen;
	17	u_int opendev; /* last device opened */
	18	extern u_int bootdev;
	19
	20	struct dirstuff {
	21	int loc;
	22	struct iob *io;
70192ca8	23	char *name;
8a8c3c41 KB	24	};
	25
	26	#ifndef SMALL
	27	static ino_t dlook __P((char , struct iob , char *));
	28	static int find __P((char , struct iob ));
	29	static int getdev __P((char *, int));
	30	static int getunit __P((char *));
	31	static struct direct readdir __P((struct dirstuff ));
	32	static int openi __P((int, struct iob *));
	33	#endif
	34
	35	open(str, how)
	36	char *str;
	37	int how;
	38	{
	39	static int firstopen = 1;
	40	register struct iob *file;
	41	register char *t;
	42	register int cnt;
	43	int fdesc, args[8], *argp;
	44
	45	if (firstopen) {
	46	for (cnt = 0; cnt < SOPEN_MAX; cnt++)
	47	iob[cnt].i_flgs = 0;
	48	firstopen = 0;
	49	}
	50
	51	for (fdesc = 0;; fdesc++) {
	52	if (fdesc == SOPEN_MAX)
	53	_stop("No more file slots");
	54	if (iob[fdesc].i_flgs == 0) {
	55	file = &iob[fdesc];
	56	file->i_flgs \|= F_ALLOC;
	57	file->i_adapt = file->i_ctlr = file->i_unit =
	58	file->i_part = 0;
	59	break;
	60	}
	61	}
	62
	63	for (cnt = 0; cnt < sizeof(args)/sizeof(args[0]); args[cnt++] = 0);
	64	#ifndef SMALL
	65	for (t = str; t && t != '/' && t != ':' && t != '('; ++t)
	66	if (isupper(*t))
	67	t = tolower(t);
	68	switch(*t) {
	69	case '(': /* type(adapt, ctlr, drive, partition)file */
	70	if ((file->i_dev = getdev(str, t - str)) == -1)
	71	goto bad;
	72	for (argp = args + 4, cnt = 0; *t != ')'; ++cnt) {
	73	for (++t; isspace(*t); ++t);
	74	if (*t == ')')
	75	break;
	76	if (!isdigit(*t))
	77	goto badspec;
	78	*argp++ = atoi(t);
	79	for (++t; isdigit(*t); ++t);
	80	if (t != ',' && t != ')' \|\| cnt == 4)
	81	goto badspec;
	82	}
	83	for (++t; isspace(*t); ++t);
	84	argp -= 4;
	85	file->i_adapt = *argp++;
	86	file->i_ctlr = *argp++;
	87	file->i_unit = *argp++;
88	file->i_part = *argp;
89	break;
90	case ':': /* [A-Za-z][0-9][A-Za-z]:file */
91	for (t = str; t != ':' && !isdigit(t); ++t);
92	if ((file->i_dev = getdev(str, t - str)) == -1)
93	goto bad;
94	if ((file->i_unit = getunit(t)) == -1)
95	goto bad;
96	for (; isdigit(*t); ++t);
97	if (t >= 'a' && t <= 'h')
98	file->i_part = *t++ - 'a';
99	if (*t != ':') {
100	errno = EOFFSET;
101	goto badspec;
102	}
103	for (++t; isspace(*t); ++t);
104	break;
105	case '/':
106	default: /* default bootstrap unit and device */
107	#else
108	{
109	#endif /* SMALL */
110	file->i_dev = B_TYPE(bootdev);
111	file->i_adapt = B_ADAPTOR(bootdev);
112	file->i_ctlr = B_CONTROLLER(bootdev);
113	file->i_unit = B_UNIT(bootdev);
114	file->i_part = B_PARTITION(bootdev);
115	t = str;
116	}
117
118	opendev = MAKEBOOTDEV(file->i_dev, file->i_adapt, file->i_ctlr,
119	file->i_unit, file->i_part);
120
121	if (errno = devopen(file))
122	goto bad;
123
124	if (*t == '\0') {
125	file->i_flgs \|= how + 1;
126	file->i_cc = 0;
127	file->i_offset = 0;
128	return (fdesc+3);
129	}
130	#ifndef SMALL
131	else if (how != 0) {
132	printf("Can't write files yet.. Sorry\n");
133	errno = EIO;
134	goto bad;
135	}
136	#endif
137	file->i_ma = (char *)(&file->i_fs);
138	file->i_cc = SBSIZE;
139	file->i_bn = SBOFF / DEV_BSIZE + file->i_boff;
140	file->i_offset = 0;
141	if (devread(file) < 0) {
142	errno = file->i_error;
143	printf("super block read error\n");
144	goto bad;
145	}
146	if ((cnt = find(t, file)) == 0) {
147	errno = ESRCH;
148	goto bad;
149	}
150	if (openi(cnt, file) < 0) {
151	errno = file->i_error;
152	goto bad;
153	}
154	file->i_offset = 0;
155	file->i_cc = 0;
156	file->i_flgs \|= F_FILE \| (how+1);
157	return (fdesc+3);
158
159	#ifndef SMALL
160	badspec:
161	printf("malformed device specification\nusage: device(adaptor, controller, drive, partition)file -or- <device><unit><partitionletter>:<file>\n");
162	#endif
163	bad:
164	file->i_flgs = 0;
165	return (-1);
166	}
167
168	#ifndef SMALL
169	static
170	getdev(str, len)
171	register char *str;
172	int len;
173	{
174	register struct devsw *dp;
175	register int i;
176	char savedch = str[len];
177
178	str[len] = '\0';
179	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
180	if (dp->dv_name && strcmp(str, dp->dv_name) == 0) {
181	str[len] = savedch;
182	return (i);
183	}
184	printf("Unknown device\nKnown devices are:\n");
185	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
186	if (dp->dv_name)
187	printf(" %s", dp->dv_name);
188	printf("\n");
189	errno = ENXIO;
190	return (-1);
191	}
192
193	static
194	getunit(cp)
195	register char *cp;
196	{
197	int unit;
198
199	unit = atoi(cp);
200	if ((u_int)unit > 255) {
201	printf("minor device number out of range (0-255)\n");
202	errno = EUNIT;
203	return (-1);
204	}
205	return (unit);
206	}
207	#endif /* SMALL */
208
209	static
210	find(path, file)
211	register char *path;
212	struct iob *file;
213	{
214	register char *q;
215	char *dir, c;
216	int n;
217
218	if (path == NULL \|\| *path == '\0') {
219	printf("null path\n");
220	return (0);
221	}
222
223	if (openi((ino_t) ROOTINO, file) < 0) {
224	printf("can't read root inode\n");
225	return (0);
226	}
227	dir = path;
228	while (*path) {
229	while (*path == '/')
230	path++;
231	q = path;
232	while(q != '/' && q != '\0')
233	q++;
234	c = *q;
235	*q = '\0';
236	if (q == path) path = "." ; /* "/" means "/." */
237
238	if ((n = dlook(path, file, dir)) != 0) {
239	if (c == '\0')
240	break;
241	if (openi(n, file) < 0)
242	return (0);
243	*q = c;
244	path = q;
245	continue;
246	} else {
247	printf("%s: not found\n", path);
248	return (0);
249	}
250	}
251	return (n);
252	}
253
254	static ino_t
255	dlook(s, io, dir)
256	char *s;
257	register struct iob *io;
258	char *dir;
259	{
260	register struct direct *dp;
261	register struct dinode *ip;
262	struct dirstuff dirp;
263	int len;
264
265	if (s == NULL \|\| *s == '\0')
266	return (0);
267	ip = &io->i_ino;
268	if ((ip->di_mode&IFMT) != IFDIR) {
269	printf("%s: not a directory\n", dir);
270	return (0);
271	}
272	if (ip->di_size == 0) {
273	printf("%s: zero length directory\n", dir);
274	return (0);
275	}
276	len = strlen(s);
277	dirp.loc = 0;
278	dirp.io = io;
70192ca8	279	dirp.name = dir;
8a8c3c41 KB	280	for (dp = readdir(&dirp); dp != NULL; dp = readdir(&dirp)) {
	281	if(dp->d_ino == 0)
	282	continue;
	283	if (dp->d_namlen == len && !strcmp(s, dp->d_name))
	284	return (dp->d_ino);
	285	}
	286	return (0);
	287	}
	288
	289	static struct direct *
	290	readdir(dirp)
	291	register struct dirstuff *dirp;
	292	{
	293	register struct direct *dp;
	294	register struct iob *io;
	295	daddr_t lbn, d;
	296	int off;
	297
	298	io = dirp->io;
	299	for(;;) {
	300	if (dirp->loc >= io->i_ino.di_size)
	301	return (NULL);
	302	off = blkoff(&io->i_fs, dirp->loc);
	303	if (off == 0) {
	304	lbn = lblkno(&io->i_fs, dirp->loc);
	305	d = bmap(io, lbn);
	306	if(d == 0)
	307	return (NULL);
	308	io->i_bn = fsbtodb(&io->i_fs, d) + io->i_boff;
	309	io->i_ma = io->i_buf;
	310	io->i_cc = dblksize(&io->i_fs, &io->i_ino, lbn);
	311	if (devread(io) < 0) {
	312	errno = io->i_error;
70192ca8 MH	313	printf("%s: directory read error, bn %ld\n",
70192ca8 MH	314	dirp->name, io->i_bn);
8a8c3c41 KB	315	return (NULL);
	316	}
	317	}
	318	dp = (struct direct *)(io->i_buf + off);
	319	dirp->loc += dp->d_reclen;
70192ca8 MH	320	if (dp->d_ino == 0) {
	321	if (dp->d_reclen == 0) {
	322	printf("%s: bad directory entry, offset %ld\n",
	323	dirp->name, dirp->loc);
	324	return (NULL);
	325	}
8a8c3c41	326	continue;
70192ca8	327	}
8a8c3c41 KB	328	return (dp);
	329	}
	330	}
	331
	332	static
	333	openi(n, io)
	334	int n;
	335	register struct iob *io;
	336	{
	337	register struct dinode *dp;
	338	int cc;
	339
	340	io->i_offset = 0;
	341	io->i_bn = fsbtodb(&io->i_fs, itod(&io->i_fs, n)) + io->i_boff;
	342	io->i_cc = io->i_fs.fs_bsize;
	343	io->i_ma = io->i_buf;
	344	cc = devread(io);
	345	dp = (struct dinode *)io->i_buf;
	346	io->i_ino = dp[itoo(&io->i_fs, n)];
	347	return (cc);
	348	}