[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"

#ifdef VMUNIX
#define	HBLKS	2
#else
#define	HBLKS	1
#endif

/*
 * 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.
 */

#ifndef VMUNIX
#define	LBLKS	125
#else
#define	LBLKS	900
#endif
#define	FNSIZE	128

struct 	header {
	time_t	Time;			/* Time temp file last updated */
	short	Uid;			/* This users identity */
#ifndef VMUNIX
	short	Flines;			/* Number of lines in file */
#else
	int	Flines;
#endif
	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] != HBLKS || H.Blocks[1] != HBLKS+1) {
#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
44232d5b MH	10	#ifdef VMUNIX
	11	#define HBLKS 2
	12	#else
	13	#define HBLKS 1
	14	#endif
	15
244381e6 MH	16	/*
	17	* Expreserve - preserve a file in usrpath(preserve)
	18	* Bill Joy UCB November 13, 1977
	19	*
	20	* This routine is very naive - it doesn't remove anything from
	21	* usrpath(preserve)... this may mean that we will be unable to preserve
	22	* stuff there... the danger in doing anything with usrpath(preserve)
	23	* is that the clock may be screwed up and we may get confused.
	24	*
	25	* We are called in two ways - first from the editor with no argumentss
	26	* and the standard input open on the temp file. Second with an argument
	27	* to preserve the entire contents of /tmp (root only).
	28	*
	29	* BUG: should do something about preserving Rx... (register contents)
	30	* temporaries.
	31	*/
	32
44232d5b	33	#ifndef VMUNIX
244381e6	34	#define LBLKS 125
44232d5b MH	35	#else
	36	#define LBLKS 900
	37	#endif
244381e6 MH	38	#define FNSIZE 128
	39
	40	struct header {
	41	time_t Time; /* Time temp file last updated */
	42	short Uid; /* This users identity */
44232d5b	43	#ifndef VMUNIX
244381e6	44	short Flines; /* Number of lines in file */
44232d5b MH	45	#else
	46	int Flines;
	47	#endif
244381e6 MH	48	char Savedfile[FNSIZE]; /* The current file name */
	49	short Blocks[LBLKS]; /* Blocks where line pointers stashed */
	50	} H;
	51
	52	#ifdef lint
	53	#define ignore(a) Ignore(a)
	54	#define ignorl(a) Ignorl(a)
	55	#else
	56	#define ignore(a) a
	57	#define ignorl(a) a
	58	#endif
	59
	60	struct passwd *getpwuid();
	61	off_t lseek();
	62	FILE *popen();
	63
	64	#define eq(a, b) strcmp(a, b) == 0
	65
	66	main(argc)
	67	int argc;
	68	{
	69	register FILE *tf;
	70	struct direct dirent;
	71	struct stat stbuf;
	72
	73	/*
	74	* If only one argument, then preserve the standard input.
	75	*/
	76	if (argc == 1) {
	77	if (copyout((char *) 0))
	78	exit(1);
	79	exit(0);
	80	}
	81
	82	/*
	83	* If not super user, then can only preserve standard input.
	84	*/
	85	if (getuid()) {
	86	fprintf(stderr, "NOT super user\n");
	87	exit(1);
	88	}
	89
	90	/*
	91	* ... else preserve all the stuff in /tmp, removing
	92	* it as we go.
	93	*/
	94	if (chdir("/tmp") < 0) {
	95	perror("/tmp");
	96	exit(1);
	97	}
	98
	99	tf = fopen(".", "r");
	100	if (tf == NULL) {
	101	perror("/tmp");
	102	exit(1);
	103	}
	104	while (fread((char *) &dirent, sizeof dirent, 1, tf) == 1) {
	105	if (dirent.d_ino == 0)
	106	continue;
	107	/*
	108	* Ex temporaries must begin with Ex;
	109	* we check that the 10th character of the name is null
	110	* so we won't have to worry about non-null terminated names
	111	* later on.
112	*/
113	if (dirent.d_name[0] != 'E' \|\| dirent.d_name[1] != 'x' \|\| dirent.d_name[10])
114	continue;
115	if (stat(dirent.d_name, &stbuf))
116	continue;
117	if ((stbuf.st_mode & S_IFMT) != S_IFREG)
118	continue;
119	/*
120	* Save the bastard.
121	*/
122	ignore(copyout(dirent.d_name));
123	}
124	exit(0);
125	}
126
127	char pattern[] = usrpath(preserve/Exaa`XXXXX);
128
129	/*
130	* Copy file name into usrpath(preserve)/...
131	* If name is (char *) 0, then do the standard input.
132	* We make some checks on the input to make sure it is
133	* really an editor temporary, generate a name for the
134	* file (this is the slowest thing since we must stat
135	* to find a unique name), and finally copy the file.
136	*/
137	copyout(name)
138	char *name;
139	{
140	int i;
141	static int reenter;
142	char buf[BUFSIZ];
143
144	/*
145	* The first time we put in the digits of our
146	* process number at the end of the pattern.
147	*/
148	if (reenter == 0) {
149	mkdigits(pattern);
150	reenter++;
151	}
152
153	/*
154	* If a file name was given, make it the standard
155	* input if possible.
156	*/
157	if (name != 0) {
158	ignore(close(0));
159	/*
160	* Need read/write access for arcane reasons
161	* (see below).
162	*/
163	if (open(name, 2) < 0)
164	return (-1);
165	}
166
167	/*
168	* Get the header block.
169	*/
170	ignorl(lseek(0, 0l, 0));
171	if (read(0, (char *) &H, sizeof H) != sizeof H) {
172	format:
173	if (name == 0)
174	fprintf(stderr, "Buffer format error\n");
175	return (-1);
176	}
177
178	/*
179	* Consistency checsks so we don't copy out garbage.
180	*/
181	if (H.Flines < 0) {
182	#ifdef DEBUG
183	fprintf(stderr, "Negative number of lines\n");
184	#endif
185	goto format;
186	}
44232d5b	187	if (H.Blocks[0] != HBLKS \|\| H.Blocks[1] != HBLKS+1) {
244381e6 MH	188	#ifdef DEBUG
	189	fprintf(stderr, "Blocks %d %d\n", H.Blocks[0], H.Blocks[1]);
	190	#endif
	191	goto format;
	192	}
	193	if (name == 0 && H.Uid != getuid()) {
	194	#ifdef DEBUG
	195	fprintf(stderr, "Wrong user-id\n");
	196	#endif
	197	goto format;
	198	}
	199	if (lseek(0, 0l, 0)) {
	200	#ifdef DEBUG
	201	fprintf(stderr, "Negative number of lines\n");
	202	#endif
	203	goto format;
	204	}
	205
	206	/*
	207	* If no name was assigned to the file, then give it the name
	208	* LOST, by putting this in the header.
	209	*/
	210	if (H.Savedfile[0] == 0) {
	211	strcpy(H.Savedfile, "LOST");
	212	ignore(write(0, (char *) &H, sizeof H));
	213	H.Savedfile[0] = 0;
	214	lseek(0, 0l, 0);
	215	}
	216
	217	/*
	218	* File is good. Get a name and create a file for the copy.
	219	*/
	220	mknext(pattern);
	221	ignore(close(1));
	222	if (creat(pattern, 0600) < 0) {
	223	if (name == 0)
	224	perror(pattern);
	225	return (1);
	226	}
	227
	228	/*
	229	* Make the target be owned by the owner of the file.
	230	*/
	231	ignore(chown(pattern, H.Uid, 0));
	232
	233	/*
	234	* Copy the file.
	235	*/
	236	for (;;) {
	237	i = read(0, buf, BUFSIZ);
	238	if (i < 0) {
	239	if (name)
	240	perror("Buffer read error");
	241	ignore(unlink(pattern));
	242	return (-1);
	243	}
	244	if (i == 0) {
	245	if (name)
	246	ignore(unlink(name));
	247	notify(H.Uid, H.Savedfile, (int) name);
	248	return (0);
	249	}
	250	if (write(1, buf, i) != i) {
	251	if (name == 0)
252	perror(pattern);
253	unlink(pattern);
254	return (-1);
255	}
256	}
257	}
258
259	/*
260	* Blast the last 5 characters of cp to be the process number.
261	*/
262	mkdigits(cp)
263	char *cp;
264	{
265	register int i, j;
266
267	for (i = getpid(), j = 5, cp += strlen(cp); j > 0; i /= 10, j--)
268	*--cp = i % 10 \| '0';
269	}
270
271	/*
272	* Make the name in cp be unique by clobbering up to
273	* three alphabetic characters into a sequence of the form 'aab', 'aac', etc.
274	* Mktemp gets weird names too quickly to be useful here.
275	*/
276	mknext(cp)
277	char *cp;
278	{
279	char *dcp;
280	struct stat stb;
281
282	dcp = cp + strlen(cp) - 1;
283	while (isdigit(*dcp))
284	dcp--;
285	whoops:
286	if (dcp[0] == 'z') {
287	dcp[0] = 'a';
288	if (dcp[-1] == 'z') {
289	dcp[-1] = 'a';
290	if (dcp[-2] == 'z')
291	fprintf(stderr, "Can't find a name\n");
292	dcp[-2]++;
293	} else
294	dcp[-1]++;
295	} else
296	dcp[0]++;
297	if (stat(cp, &stb) == 0)
298	goto whoops;
299	}
300
301	/*
302	* Notify user uid that his file fname has been saved.
303	*/
304	notify(uid, fname, flag)
305	int uid;
306	char *fname;
307	{
308	struct passwd *pp = getpwuid(uid);
309	register FILE *mf;
310	char cmd[BUFSIZ];
311
312	if (pp == NULL)
313	return;
314	sprintf(cmd, "mail %s", pp->pw_name);
315	mf = popen(cmd, "w");
316	if (mf == NULL)
317	return;
318	setbuf(mf, cmd);
319	if (fname[0] == 0) {
320	fprintf(mf,
321	"A copy of an editor buffer of yours was saved when %s.\n",
322	flag ? "the system went down" : "your phone was hung up");
323	fprintf(mf,
324	"No name was associated with this buffer so it has been named \"LOST\".\n");
325	} else
326	fprintf(mf,
327	"A copy of an editor buffer of your file \"%s\"\nwas saved when %s.\n", fname,
328	flag ? "the system went down" : "your phone was hung up");
329	fprintf(mf,
330	"This buffer can be retrieved using the \"recover\" command of the editor.\n");
331	fprintf(mf,
332	"An easy way to do this is to give the command \"ex -r %s\".\n",fname);
333	fprintf(mf,
334	"This works for \"edit\" and \"vi\" also.\n");
335	pclose(mf);
336	}
337
338	/*
339	* people making love
340	* never exactly the same
341	* just like a snowflake
342	*/
343
344	#ifdef lint
345	Ignore(a)
346	int a;
347	{
348
349	a = a;
350	}
351
352	Ignorl(a)
353	long a;
354	{
355
356	a = a;
357	}
358	#endif