[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	7.2 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/reboot.h>
#include <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);
}
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	*
de95853c	7	* @(#)open.c 7.2 (Berkeley) %G%
8a8c3c41 KB	8	*/
	9
	10	#include <sys/param.h>
	11	#include <sys/reboot.h>
	12	#include <ufs/dir.h>
	13	#include "saio.h"
	14
	15	int firstopen;
	16	u_int opendev; /* last device opened */
	17	extern u_int bootdev;
	18
	19	struct dirstuff {
	20	int loc;
	21	struct iob *io;
	22	};
	23
	24	#ifndef SMALL
	25	static ino_t dlook __P((char , struct iob , char *));
	26	static int find __P((char , struct iob ));
	27	static int getdev __P((char *, int));
	28	static int getunit __P((char *));
	29	static struct direct readdir __P((struct dirstuff ));
	30	static int openi __P((int, struct iob *));
	31	#endif
	32
	33	open(str, how)
	34	char *str;
	35	int how;
	36	{
	37	static int firstopen = 1;
	38	register struct iob *file;
	39	register char *t;
	40	register int cnt;
	41	int fdesc, args[8], *argp;
	42
	43	if (firstopen) {
	44	for (cnt = 0; cnt < SOPEN_MAX; cnt++)
	45	iob[cnt].i_flgs = 0;
	46	firstopen = 0;
	47	}
	48
	49	for (fdesc = 0;; fdesc++) {
	50	if (fdesc == SOPEN_MAX)
	51	_stop("No more file slots");
	52	if (iob[fdesc].i_flgs == 0) {
	53	file = &iob[fdesc];
	54	file->i_flgs \|= F_ALLOC;
	55	file->i_adapt = file->i_ctlr = file->i_unit =
	56	file->i_part = 0;
	57	break;
	58	}
	59	}
	60
	61	for (cnt = 0; cnt < sizeof(args)/sizeof(args[0]); args[cnt++] = 0);
	62	#ifndef SMALL
	63	for (t = str; t && t != '/' && t != ':' && t != '('; ++t)
	64	if (isupper(*t))
	65	t = tolower(t);
	66	switch(*t) {
	67	case '(': /* type(adapt, ctlr, drive, partition)file */
	68	if ((file->i_dev = getdev(str, t - str)) == -1)
	69	goto bad;
	70	for (argp = args + 4, cnt = 0; *t != ')'; ++cnt) {
	71	for (++t; isspace(*t); ++t);
72	if (*t == ')')
73	break;
74	if (!isdigit(*t))
75	goto badspec;
76	*argp++ = atoi(t);
77	for (++t; isdigit(*t); ++t);
78	if (t != ',' && t != ')' \|\| cnt == 4)
79	goto badspec;
80	}
81	for (++t; isspace(*t); ++t);
82	argp -= 4;
83	file->i_adapt = *argp++;
84	file->i_ctlr = *argp++;
85	file->i_unit = *argp++;
86	file->i_part = *argp;
87	break;
88	case ':': /* [A-Za-z][0-9][A-Za-z]:file */
89	for (t = str; t != ':' && !isdigit(t); ++t);
90	if ((file->i_dev = getdev(str, t - str)) == -1)
91	goto bad;
92	if ((file->i_unit = getunit(t)) == -1)
93	goto bad;
94	for (; isdigit(*t); ++t);
95	if (t >= 'a' && t <= 'h')
96	file->i_part = *t++ - 'a';
97	if (*t != ':') {
98	errno = EOFFSET;
99	goto badspec;
100	}
101	for (++t; isspace(*t); ++t);
102	break;
103	case '/':
104	default: /* default bootstrap unit and device */
105	#else
106	{
107	#endif /* SMALL */
108	file->i_dev = B_TYPE(bootdev);
109	file->i_adapt = B_ADAPTOR(bootdev);
110	file->i_ctlr = B_CONTROLLER(bootdev);
111	file->i_unit = B_UNIT(bootdev);
112	file->i_part = B_PARTITION(bootdev);
113	t = str;
114	}
115
116	opendev = MAKEBOOTDEV(file->i_dev, file->i_adapt, file->i_ctlr,
117	file->i_unit, file->i_part);
118
119	if (errno = devopen(file))
120	goto bad;
121
122	if (*t == '\0') {
123	file->i_flgs \|= how + 1;
124	file->i_cc = 0;
125	file->i_offset = 0;
126	return (fdesc+3);
127	}
128	#ifndef SMALL
129	else if (how != 0) {
130	printf("Can't write files yet.. Sorry\n");
131	errno = EIO;
132	goto bad;
133	}
134	#endif
135	file->i_ma = (char *)(&file->i_fs);
136	file->i_cc = SBSIZE;
137	file->i_bn = SBOFF / DEV_BSIZE + file->i_boff;
138	file->i_offset = 0;
139	if (devread(file) < 0) {
140	errno = file->i_error;
141	printf("super block read error\n");
142	goto bad;
143	}
144	if ((cnt = find(t, file)) == 0) {
145	errno = ESRCH;
146	goto bad;
147	}
148	if (openi(cnt, file) < 0) {
149	errno = file->i_error;
150	goto bad;
151	}
152	file->i_offset = 0;
153	file->i_cc = 0;
154	file->i_flgs \|= F_FILE \| (how+1);
155	return (fdesc+3);
156
157	#ifndef SMALL
158	badspec:
159	printf("malformed device specification\nusage: device(adaptor, controller, drive, partition)file -or- <device><unit><partitionletter>:<file>\n");
160	#endif
161	bad:
162	file->i_flgs = 0;
163	return (-1);
164	}
165
166	#ifndef SMALL
167	static
168	getdev(str, len)
169	register char *str;
170	int len;
171	{
172	register struct devsw *dp;
173	register int i;
174	char savedch = str[len];
175
176	str[len] = '\0';
177	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
178	if (dp->dv_name && strcmp(str, dp->dv_name) == 0) {
179	str[len] = savedch;
180	return (i);
181	}
182	printf("Unknown device\nKnown devices are:\n");
183	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
184	if (dp->dv_name)
185	printf(" %s", dp->dv_name);
186	printf("\n");
187	errno = ENXIO;
188	return (-1);
189	}
190
191	static
192	getunit(cp)
193	register char *cp;
194	{
195	int unit;
196
197	unit = atoi(cp);
198	if ((u_int)unit > 255) {
199	printf("minor device number out of range (0-255)\n");
200	errno = EUNIT;
201	return (-1);
202	}
203	return (unit);
204	}
205	#endif /* SMALL */
206
207	static
208	find(path, file)
209	register char *path;
210	struct iob *file;
211	{
212	register char *q;
213	char *dir, c;
214	int n;
215
216	if (path == NULL \|\| *path == '\0') {
217	printf("null path\n");
218	return (0);
219	}
220
221	if (openi((ino_t) ROOTINO, file) < 0) {
222	printf("can't read root inode\n");
223	return (0);
224	}
225	dir = path;
226	while (*path) {
227	while (*path == '/')
228	path++;
229	q = path;
230	while(q != '/' && q != '\0')
231	q++;
232	c = *q;
233	*q = '\0';
234	if (q == path) path = "." ; /* "/" means "/." */
235
236	if ((n = dlook(path, file, dir)) != 0) {
237	if (c == '\0')
238	break;
239	if (openi(n, file) < 0)
240	return (0);
241	*q = c;
242	path = q;
243	continue;
244	} else {
245	printf("%s: not found\n", path);
246	return (0);
247	}
248	}
249	return (n);
250	}
251
252	static ino_t
253	dlook(s, io, dir)
254	char *s;
255	register struct iob *io;
256	char *dir;
257	{
258	register struct direct *dp;
259	register struct dinode *ip;
260	struct dirstuff dirp;
261	int len;
262
263	if (s == NULL \|\| *s == '\0')
264	return (0);
265	ip = &io->i_ino;
266	if ((ip->di_mode&IFMT) != IFDIR) {
267	printf("%s: not a directory\n", dir);
268	return (0);
269	}
270	if (ip->di_size == 0) {
271	printf("%s: zero length directory\n", dir);
272	return (0);
273	}
274	len = strlen(s);
275	dirp.loc = 0;
276	dirp.io = io;
277	for (dp = readdir(&dirp); dp != NULL; dp = readdir(&dirp)) {
278	if(dp->d_ino == 0)
279	continue;
280	if (dp->d_namlen == len && !strcmp(s, dp->d_name))
281	return (dp->d_ino);
282	}
283	return (0);
284	}
285
286	static struct direct *
287	readdir(dirp)
288	register struct dirstuff *dirp;
289	{
290	register struct direct *dp;
291	register struct iob *io;
292	daddr_t lbn, d;
293	int off;
294
295	io = dirp->io;
296	for(;;) {
297	if (dirp->loc >= io->i_ino.di_size)
298	return (NULL);
299	off = blkoff(&io->i_fs, dirp->loc);
300	if (off == 0) {
301	lbn = lblkno(&io->i_fs, dirp->loc);
302	d = bmap(io, lbn);
303	if(d == 0)
304	return (NULL);
305	io->i_bn = fsbtodb(&io->i_fs, d) + io->i_boff;
306	io->i_ma = io->i_buf;
307	io->i_cc = dblksize(&io->i_fs, &io->i_ino, lbn);
308	if (devread(io) < 0) {
309	errno = io->i_error;
de95853c	310	printf("bn %ld: directory read error\n",
8a8c3c41 KB	311	io->i_bn);
	312	return (NULL);
	313	}
	314	}
	315	dp = (struct direct *)(io->i_buf + off);
	316	dirp->loc += dp->d_reclen;
	317	if (dp->d_ino == 0)
	318	continue;
	319	return (dp);
	320	}
	321	}
	322
	323	static
	324	openi(n, io)
	325	int n;
	326	register struct iob *io;
	327	{
	328	register struct dinode *dp;
	329	int cc;
	330
	331	io->i_offset = 0;
	332	io->i_bn = fsbtodb(&io->i_fs, itod(&io->i_fs, n)) + io->i_boff;
	333	io->i_cc = io->i_fs.fs_bsize;
	334	io->i_ma = io->i_buf;
	335	cc = devread(io);
	336	dp = (struct dinode *)io->i_buf;
	337	io->i_ino = dp[itoo(&io->i_fs, n)];
	338	return (cc);
	339	}
	340