[unix-history] / usr / src / usr.bin / ex / ex3.7preserve / ex3.7preserve.c

/* Copyright (c) 1979 Regents of the University of California */
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/dir.h>
#include <pwd.h>
#include "local/uparm.h"

/*
 * Expreserve - preserve a file in usrpath(preserve)
 * Bill Joy UCB November 13, 1977
 *
 * This routine is very naive - it doesn't remove anything from
 * usrpath(preserve)... this may mean that we will be unable to preserve
 * stuff there... the danger in doing anything with usrpath(preserve)
 * is that the clock may be screwed up and we may get confused.
 *
 * We are called in two ways - first from the editor with no argumentss
 * and the standard input open on the temp file. Second with an argument
 * to preserve the entire contents of /tmp (root only).
 *
 * BUG: should do something about preserving Rx... (register contents)
 *      temporaries.
 */

#define	LBLKS	125
#define	FNSIZE	128

struct 	header {
	time_t	Time;			/* Time temp file last updated */
	short	Uid;			/* This users identity */
	short	Flines;			/* Number of lines in file */
	char	Savedfile[FNSIZE];	/* The current file name */
	short	Blocks[LBLKS];		/* Blocks where line pointers stashed */
} H;

#ifdef	lint
#define	ignore(a)	Ignore(a)
#define	ignorl(a)	Ignorl(a)
#else
#define	ignore(a)	a
#define	ignorl(a)	a
#endif

struct	passwd *getpwuid();
off_t	lseek();
FILE	*popen();

#define eq(a, b) strcmp(a, b) == 0

main(argc)
	int argc;
{
	register FILE *tf;
	struct direct dirent;
	struct stat stbuf;

	/*
	 * If only one argument, then preserve the standard input.
	 */
	if (argc == 1) {
		if (copyout((char *) 0))
			exit(1);
		exit(0);
	}

	/*
	 * If not super user, then can only preserve standard input.
	 */
	if (getuid()) {
		fprintf(stderr, "NOT super user\n");
		exit(1);
	}

	/*
	 * ... else preserve all the stuff in /tmp, removing
	 * it as we go.
	 */
	if (chdir("/tmp") < 0) {
		perror("/tmp");
		exit(1);
	}

	tf = fopen(".", "r");
	if (tf == NULL) {
		perror("/tmp");
		exit(1);
	}
	while (fread((char *) &dirent, sizeof dirent, 1, tf) == 1) {
		if (dirent.d_ino == 0)
			continue;
		/*
		 * Ex temporaries must begin with Ex;
		 * we check that the 10th character of the name is null
		 * so we won't have to worry about non-null terminated names
		 * later on.
		 */
		if (dirent.d_name[0] != 'E' || dirent.d_name[1] != 'x' || dirent.d_name[10])
			continue;
		if (stat(dirent.d_name, &stbuf))
			continue;
		if ((stbuf.st_mode & S_IFMT) != S_IFREG)
			continue;
		/*
		 * Save the bastard.
		 */
		ignore(copyout(dirent.d_name));
	}
	exit(0);
}

char	pattern[] =	usrpath(preserve/Exaa`XXXXX);

/*
 * Copy file name into usrpath(preserve)/...
 * If name is (char *) 0, then do the standard input.
 * We make some checks on the input to make sure it is
 * really an editor temporary, generate a name for the
 * file (this is the slowest thing since we must stat
 * to find a unique name), and finally copy the file.
 */
copyout(name)
	char *name;
{
	int i;
	static int reenter;
	char buf[BUFSIZ];

	/*
	 * The first time we put in the digits of our
	 * process number at the end of the pattern.
	 */
	if (reenter == 0) {
		mkdigits(pattern);
		reenter++;
	}

	/*
	 * If a file name was given, make it the standard
	 * input if possible.
	 */
	if (name != 0) {
		ignore(close(0));
		/*
		 * Need read/write access for arcane reasons
		 * (see below).
		 */
		if (open(name, 2) < 0)
			return (-1);
	}

	/*
	 * Get the header block.
	 */
	ignorl(lseek(0, 0l, 0));
	if (read(0, (char *) &H, sizeof H) != sizeof H) {
format:
		if (name == 0)
			fprintf(stderr, "Buffer format error\n");
		return (-1);
	}

	/*
	 * Consistency checsks so we don't copy out garbage.
	 */
	if (H.Flines < 0) {
#ifdef DEBUG
		fprintf(stderr, "Negative number of lines\n");
#endif
		goto format;
	}
	if (H.Blocks[0] != 1 || H.Blocks[1] != 2) {
#ifdef DEBUG
		fprintf(stderr, "Blocks %d %d\n", H.Blocks[0], H.Blocks[1]);
#endif
		goto format;
	}
	if (name == 0 && H.Uid != getuid()) {
#ifdef DEBUG
		fprintf(stderr, "Wrong user-id\n");
#endif
		goto format;
	}
	if (lseek(0, 0l, 0)) {
#ifdef DEBUG
		fprintf(stderr, "Negative number of lines\n");
#endif
		goto format;
	}

	/*
	 * If no name was assigned to the file, then give it the name
	 * LOST, by putting this in the header.
	 */
	if (H.Savedfile[0] == 0) {
		strcpy(H.Savedfile, "LOST");
		ignore(write(0, (char *) &H, sizeof H));
		H.Savedfile[0] = 0;
		lseek(0, 0l, 0);
	}

	/*
	 * File is good.  Get a name and create a file for the copy.
	 */
	mknext(pattern);
	ignore(close(1));
	if (creat(pattern, 0600) < 0) {
		if (name == 0)
			perror(pattern);
		return (1);
	}

	/*
	 * Make the target be owned by the owner of the file.
	 */
	ignore(chown(pattern, H.Uid, 0));

	/*
	 * Copy the file.
	 */
	for (;;) {
		i = read(0, buf, BUFSIZ);
		if (i < 0) {
			if (name)
				perror("Buffer read error");
			ignore(unlink(pattern));
			return (-1);
		}
		if (i == 0) {
			if (name)
				ignore(unlink(name));
			notify(H.Uid, H.Savedfile, (int) name);
			return (0);
		}
		if (write(1, buf, i) != i) {
			if (name == 0)
				perror(pattern);
			unlink(pattern);
			return (-1);
		}
	}
}

/*
 * Blast the last 5 characters of cp to be the process number.
 */
mkdigits(cp)
	char *cp;
{
	register int i, j;

	for (i = getpid(), j = 5, cp += strlen(cp); j > 0; i /= 10, j--)
		*--cp = i % 10 | '0';
}

/*
 * Make the name in cp be unique by clobbering up to
 * three alphabetic characters into a sequence of the form 'aab', 'aac', etc.
 * Mktemp gets weird names too quickly to be useful here.
 */
mknext(cp)
	char *cp;
{
	char *dcp;
	struct stat stb;

	dcp = cp + strlen(cp) - 1;
	while (isdigit(*dcp))
		dcp--;
whoops:
	if (dcp[0] == 'z') {
		dcp[0] = 'a';
		if (dcp[-1] == 'z') {
			dcp[-1] = 'a';
			if (dcp[-2] == 'z')
				fprintf(stderr, "Can't find a name\n");
			dcp[-2]++;
		} else
			dcp[-1]++;
	} else
		dcp[0]++;
	if (stat(cp, &stb) == 0)
		goto whoops;
}

/*
 * Notify user uid that his file fname has been saved.
 */
notify(uid, fname, flag)
	int uid;
	char *fname;
{
	struct passwd *pp = getpwuid(uid);
	register FILE *mf;
	char cmd[BUFSIZ];

	if (pp == NULL)
		return;
	sprintf(cmd, "mail %s", pp->pw_name);
	mf = popen(cmd, "w");
	if (mf == NULL)
		return;
	setbuf(mf, cmd);
	if (fname[0] == 0) {
		fprintf(mf,
"A copy of an editor buffer of yours was saved when %s.\n",
		flag ? "the system went down" : "your phone was hung up");
		fprintf(mf,
"No name was associated with this buffer so it has been named \"LOST\".\n");
	} else
		fprintf(mf,
"A copy of an editor buffer of your file \"%s\"\nwas saved when %s.\n", fname,
		flag ? "the system went down" : "your phone was hung up");
	fprintf(mf,
"This buffer can be retrieved using the \"recover\" command of the editor.\n");
	fprintf(mf,
"An easy way to do this is to give the command \"ex -r %s\".\n",fname);
	fprintf(mf,
"This works for \"edit\" and \"vi\" also.\n");
	pclose(mf);
}

/*
 *	people making love
 *	never exactly the same
 *	just like a snowflake 
 */

#ifdef lint
Ignore(a)
	int a;
{

	a = a;
}

Ignorl(a)
	long a;
{

	a = a;
}
#endif
Commit	Line	Data
244381e6 MH	1	/* Copyright (c) 1979 Regents of the University of California */
	2	#include <stdio.h>
	3	#include <ctype.h>
	4	#include <sys/types.h>
	5	#include <sys/stat.h>
	6	#include <sys/dir.h>
	7	#include <pwd.h>
	8	#include "local/uparm.h"
	9
	10	/*
	11	* Expreserve - preserve a file in usrpath(preserve)
	12	* Bill Joy UCB November 13, 1977
	13	*
	14	* This routine is very naive - it doesn't remove anything from
	15	* usrpath(preserve)... this may mean that we will be unable to preserve
	16	* stuff there... the danger in doing anything with usrpath(preserve)
	17	* is that the clock may be screwed up and we may get confused.
	18	*
	19	* We are called in two ways - first from the editor with no argumentss
	20	* and the standard input open on the temp file. Second with an argument
	21	* to preserve the entire contents of /tmp (root only).
	22	*
	23	* BUG: should do something about preserving Rx... (register contents)
	24	* temporaries.
	25	*/
	26
	27	#define LBLKS 125
	28	#define FNSIZE 128
	29
	30	struct header {
	31	time_t Time; /* Time temp file last updated */
	32	short Uid; /* This users identity */
	33	short Flines; /* Number of lines in file */
	34	char Savedfile[FNSIZE]; /* The current file name */
	35	short Blocks[LBLKS]; /* Blocks where line pointers stashed */
	36	} H;
	37
	38	#ifdef lint
	39	#define ignore(a) Ignore(a)
	40	#define ignorl(a) Ignorl(a)
	41	#else
	42	#define ignore(a) a
	43	#define ignorl(a) a
	44	#endif
	45
	46	struct passwd *getpwuid();
	47	off_t lseek();
	48	FILE *popen();
	49
	50	#define eq(a, b) strcmp(a, b) == 0
	51
	52	main(argc)
	53	int argc;
	54	{
	55	register FILE *tf;
	56	struct direct dirent;
	57	struct stat stbuf;
	58
	59	/*
	60	* If only one argument, then preserve the standard input.
	61	*/
	62	if (argc == 1) {
	63	if (copyout((char *) 0))
	64	exit(1);
65	exit(0);
66	}
67
68	/*
69	* If not super user, then can only preserve standard input.
70	*/
71	if (getuid()) {
72	fprintf(stderr, "NOT super user\n");
73	exit(1);
74	}
75
76	/*
77	* ... else preserve all the stuff in /tmp, removing
78	* it as we go.
79	*/
80	if (chdir("/tmp") < 0) {
81	perror("/tmp");
82	exit(1);
83	}
84
85	tf = fopen(".", "r");
86	if (tf == NULL) {
87	perror("/tmp");
88	exit(1);
89	}
90	while (fread((char *) &dirent, sizeof dirent, 1, tf) == 1) {
91	if (dirent.d_ino == 0)
92	continue;
93	/*
94	* Ex temporaries must begin with Ex;
95	* we check that the 10th character of the name is null
96	* so we won't have to worry about non-null terminated names
97	* later on.
98	*/
99	if (dirent.d_name[0] != 'E' \|\| dirent.d_name[1] != 'x' \|\| dirent.d_name[10])
100	continue;
101	if (stat(dirent.d_name, &stbuf))
102	continue;
103	if ((stbuf.st_mode & S_IFMT) != S_IFREG)
104	continue;
105	/*
106	* Save the bastard.
107	*/
108	ignore(copyout(dirent.d_name));
109	}
110	exit(0);
111	}
112
113	char pattern[] = usrpath(preserve/Exaa`XXXXX);
114
115	/*
116	* Copy file name into usrpath(preserve)/...
117	* If name is (char *) 0, then do the standard input.
118	* We make some checks on the input to make sure it is
119	* really an editor temporary, generate a name for the
120	* file (this is the slowest thing since we must stat
121	* to find a unique name), and finally copy the file.
122	*/
123	copyout(name)
124	char *name;
125	{
126	int i;
127	static int reenter;
128	char buf[BUFSIZ];
129
130	/*
131	* The first time we put in the digits of our
132	* process number at the end of the pattern.
133	*/
134	if (reenter == 0) {
135	mkdigits(pattern);
136	reenter++;
137	}
138
139	/*
140	* If a file name was given, make it the standard
141	* input if possible.
142	*/
143	if (name != 0) {
144	ignore(close(0));
145	/*
146	* Need read/write access for arcane reasons
147	* (see below).
148	*/
149	if (open(name, 2) < 0)
150	return (-1);
151	}
152
153	/*
154	* Get the header block.
155	*/
156	ignorl(lseek(0, 0l, 0));
157	if (read(0, (char *) &H, sizeof H) != sizeof H) {
158	format:
159	if (name == 0)
160	fprintf(stderr, "Buffer format error\n");
161	return (-1);
162	}
163
164	/*
165	* Consistency checsks so we don't copy out garbage.
166	*/
167	if (H.Flines < 0) {
168	#ifdef DEBUG
169	fprintf(stderr, "Negative number of lines\n");
170	#endif
171	goto format;
172	}
173	if (H.Blocks[0] != 1 \|\| H.Blocks[1] != 2) {
174	#ifdef DEBUG
175	fprintf(stderr, "Blocks %d %d\n", H.Blocks[0], H.Blocks[1]);
176	#endif
177	goto format;
178	}
179	if (name == 0 && H.Uid != getuid()) {
180	#ifdef DEBUG
181	fprintf(stderr, "Wrong user-id\n");
182	#endif
183	goto format;
184	}
185	if (lseek(0, 0l, 0)) {
186	#ifdef DEBUG
187	fprintf(stderr, "Negative number of lines\n");
188	#endif
189	goto format;
190	}
191
192	/*
193	* If no name was assigned to the file, then give it the name
194	* LOST, by putting this in the header.
195	*/
196	if (H.Savedfile[0] == 0) {
197	strcpy(H.Savedfile, "LOST");
198	ignore(write(0, (char *) &H, sizeof H));
199	H.Savedfile[0] = 0;
200	lseek(0, 0l, 0);
201	}
202
203	/*
204	* File is good. Get a name and create a file for the copy.
205	*/
206	mknext(pattern);
207	ignore(close(1));
208	if (creat(pattern, 0600) < 0) {
209	if (name == 0)
210	perror(pattern);
211	return (1);
212	}
213
214	/*
215	* Make the target be owned by the owner of the file.
216	*/
217	ignore(chown(pattern, H.Uid, 0));
218
219	/*
220	* Copy the file.
221	*/
222	for (;;) {
223	i = read(0, buf, BUFSIZ);
224	if (i < 0) {
225	if (name)
226	perror("Buffer read error");
227	ignore(unlink(pattern));
228	return (-1);
229	}
230	if (i == 0) {
231	if (name)
232	ignore(unlink(name));
233	notify(H.Uid, H.Savedfile, (int) name);
234	return (0);
235	}
236	if (write(1, buf, i) != i) {
237	if (name == 0)
238	perror(pattern);
239	unlink(pattern);
240	return (-1);
241	}
242	}
243	}
244
245	/*
246	* Blast the last 5 characters of cp to be the process number.
247	*/
248	mkdigits(cp)
249	char *cp;
250	{
251	register int i, j;
252
253	for (i = getpid(), j = 5, cp += strlen(cp); j > 0; i /= 10, j--)
254	*--cp = i % 10 \| '0';
255	}
256
257	/*
258	* Make the name in cp be unique by clobbering up to
259	* three alphabetic characters into a sequence of the form 'aab', 'aac', etc.
260	* Mktemp gets weird names too quickly to be useful here.
261	*/
262	mknext(cp)
263	char *cp;
264	{
265	char *dcp;
266	struct stat stb;
267
268	dcp = cp + strlen(cp) - 1;
269	while (isdigit(*dcp))
270	dcp--;
271	whoops:
272	if (dcp[0] == 'z') {
273	dcp[0] = 'a';
274	if (dcp[-1] == 'z') {
275	dcp[-1] = 'a';
276	if (dcp[-2] == 'z')
277	fprintf(stderr, "Can't find a name\n");
278	dcp[-2]++;
279	} else
280	dcp[-1]++;
281	} else
282	dcp[0]++;
283	if (stat(cp, &stb) == 0)
284	goto whoops;
285	}
286
287	/*
288	* Notify user uid that his file fname has been saved.
289	*/
290	notify(uid, fname, flag)
291	int uid;
292	char *fname;
293	{
294	struct passwd *pp = getpwuid(uid);
295	register FILE *mf;
296	char cmd[BUFSIZ];
297
298	if (pp == NULL)
299	return;
300	sprintf(cmd, "mail %s", pp->pw_name);
301	mf = popen(cmd, "w");
302	if (mf == NULL)
303	return;
304	setbuf(mf, cmd);
305	if (fname[0] == 0) {
306	fprintf(mf,
307	"A copy of an editor buffer of yours was saved when %s.\n",
308	flag ? "the system went down" : "your phone was hung up");
309	fprintf(mf,
310	"No name was associated with this buffer so it has been named \"LOST\".\n");
311	} else
312	fprintf(mf,
313	"A copy of an editor buffer of your file \"%s\"\nwas saved when %s.\n", fname,
314	flag ? "the system went down" : "your phone was hung up");
315	fprintf(mf,
316	"This buffer can be retrieved using the \"recover\" command of the editor.\n");
317	fprintf(mf,
318	"An easy way to do this is to give the command \"ex -r %s\".\n",fname);
319	fprintf(mf,
320	"This works for \"edit\" and \"vi\" also.\n");
321	pclose(mf);
322	}
323
324	/*
325	* people making love
326	* never exactly the same
327	* just like a snowflake
328	*/
329
330	#ifdef lint
331	Ignore(a)
332	int a;
333	{
334
335	a = a;
336	}
337
338	Ignorl(a)
339	long a;
340	{
341
342	a = a;
343	}
344	#endif