288 lines
6.6 KiB
C
288 lines
6.6 KiB
C
/* elvprsv.c */
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/* Author:
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* Steve Kirkendall
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* 14407 SW Teal Blvd. #C
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* Beaverton, OR 97005
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* kirkenda@cs.pdx.edu
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*/
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/* This file contains the portable sources for the "elvprsv" program.
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* "Elvprsv" is run by Elvis when Elvis is about to die. It is also
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* run when the computer boots up. It is not intended to be run directly
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* by the user, ever.
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*
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* Basically, this program does the following four things:
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* - It extracts the text from the temporary file, and places the text in
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* a file in the /usr/preserve directory.
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* - It adds a line to the /usr/preserve/Index file, describing the file
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* that it just preserved.
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* - It removes the temporary file.
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* - It sends mail to the owner of the file, saying that the file was
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* preserved, and how it can be recovered.
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*
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* The /usr/preserve/Index file is a log file that contains one line for each
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* file that has ever been preserved. Each line of this file describes one
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* preserved file. The first word on the line is the name of the file that
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* contains the preserved text. The second word is the full pathname of the
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* file that was being edited; for anonymous buffers, this is the directory
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* name plus "/foo".
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*
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* If elvprsv's first argument (after the command name) starts with a hyphen,
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* then the characters after the hyphen are used as a description of when
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* the editor went away. This is optional.
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*
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* The remaining arguments are all the names of temporary files that are
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* to be preserved. For example, on a UNIX system, the /etc/rc file might
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* invoke it this way:
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*
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* elvprsv "-the system went down" /tmp/elv_*.*
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*
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* This file contains only the portable parts of the preserve program.
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* It must #include a system-specific file. The system-specific file is
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* expected to define the following functions:
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*
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* char *ownername(char *filename) - returns name of person who owns file
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*
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* void mail(char *user, char *name, char *when)
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* - tell user that file was preserved
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*/
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#include <stdio.h>
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#include "config.h"
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#include "vi.h"
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#if AMIGA
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BLK tmpblk;
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#error AMIGA here DEBUG
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# include "amiwild.c"
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# include "amiprsv.c"
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#endif
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#if OSK
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# undef sprintf
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#endif
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#if ANY_UNIX || OSK
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# include "prsvunix.c"
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#endif
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#if MSDOS || TOS
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# include "prsvdos.c"
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# define WILDCARD_NO_MAIN
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# include "wildcard.c"
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#endif
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BLK buf;
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BLK hdr;
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BLK name;
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int rewrite_now; /* boolean: should we send text directly to orig file? */
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/* This function preserves a single file, and announces its success/failure
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* via an e-mail message.
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*/
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void preserve(tname, when)
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char *tname; /* name of a temp file to be preserved */
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char *when; /* description of when the editor died */
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{
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int infd; /* fd used for reading from the temp file */
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FILE *outfp; /* fp used for writing to the recovery file */
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FILE *index; /* fp used for appending to index file */
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char outname[100]; /* the name of the recovery file */
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char *user; /* name of the owner of the temp file */
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#if AMIGA
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char *prsvdir;
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#endif
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int i;
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/* open the temp file */
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infd = open(tname, O_RDONLY|O_BINARY);
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if (infd < 0)
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{
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/* if we can't open the file, then we should assume that
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* the filename contains wildcard characters that weren't
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* expanded... and also assume that they weren't expanded
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* because there are no files that need to be preserved.
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* THEREFORE... we should silently ignore it.
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* (Or loudly ignore it if the user was using -R)
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*/
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if (rewrite_now)
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{
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perror(tname);
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}
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return;
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}
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/* read the header and name from the file */
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if (read(infd, hdr.c, BLKSIZE) != BLKSIZE
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|| read(infd, name.c, BLKSIZE) != BLKSIZE)
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{
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/* something wrong with the file - sorry */
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fprintf(stderr, "%s: trucated header blocks\n", tname);
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close(infd);
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return;
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}
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/* If the filename block contains an empty string, then Elvis was
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* only keeping the temp file around because it contained some text
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* that was needed for a named cut buffer. The user doesn't care
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* about that kind of temp file, so we should silently delete it.
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*/
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if (name.c[0] == '\0' && name.c[1] == '\177')
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{
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close(infd);
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unlink(tname);
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return;
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}
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if (rewrite_now)
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{
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/* we don't need to open the index file */
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index = (FILE *)0;
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/* make sure we can read every block! */
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for (i = 1; i < MAXBLKS && hdr.n[i]; i++)
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{
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lseek(infd, (long)hdr.n[i] * (long)BLKSIZE, 0);
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if (read(infd, buf.c, BLKSIZE) != BLKSIZE)
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{
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/* messed up header */
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fprintf(stderr, "%s: unrecoverable -- header trashed\n", name.c);
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close(infd);
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return;
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}
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}
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/* open the user's file for writing */
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outfp = fopen(name.c, "w");
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if (!outfp)
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{
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perror(name.c);
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close(infd);
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return;
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}
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}
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else
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{
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/* open/create the index file */
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index = fopen(PRSVINDEX, "a");
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if (!index)
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{
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perror(PRSVINDEX);
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exit(1);
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}
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/* create the recovery file in the PRESVDIR directory */
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#if AMIGA
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prsvdir = &PRSVDIR[strlen(PRSVDIR) - 1];
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if (*prsvdir == '/' || *prsvdir == ':')
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{
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sprintf(outname, "%sp%ld", PRSVDIR, ftell(index));
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}
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else
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#endif
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sprintf(outname, "%s%cp%ld", PRSVDIR, SLASH, ftell(index));
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outfp = fopen(outname, "w");
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if (!outfp)
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{
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perror(outname);
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close(infd);
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fclose(index);
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return;
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}
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}
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/* write the text of the file out to the recovery file */
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for (i = 1; i < MAXBLKS && hdr.n[i]; i++)
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{
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lseek(infd, (long)hdr.n[i] * (long)BLKSIZE, 0);
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if (read(infd, buf.c, BLKSIZE) != BLKSIZE)
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{
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/* messed up header */
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fprintf(stderr, "%s: unrecoverable -- header trashed\n", name.c);
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fclose(outfp);
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close(infd);
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if (index)
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{
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fclose(index);
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}
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unlink(outname);
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return;
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}
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fputs(buf.c, outfp);
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}
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/* add a line to the index file */
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if (index)
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{
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fprintf(index, "%s %s\n", outname, name.c);
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}
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/* close everything */
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close(infd);
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fclose(outfp);
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if (index)
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{
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fclose(index);
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}
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/* Are we doing this due to something more frightening than just
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* a ":preserve" command?
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*/
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if (*when)
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{
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/* send a mail message */
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mail(ownername(tname), name.c, when);
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/* remove the temp file -- the editor has died already */
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unlink(tname);
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}
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}
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main(argc, argv)
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int argc;
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char **argv;
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{
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int i;
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char *when = "the editor went away";
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#if MSDOS || TOS
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/* expand any wildcards in the command line */
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argv = wildexpand(&argc, argv);
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#endif
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/* do we have a "when" argument? */
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i = 1;
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if (argc >= i + 1 && !strcmp(argv[i], "-R"))
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{
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rewrite_now = 1;
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when = "";
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i++;
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#if ANY_UNIX
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setuid(geteuid());
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#endif
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}
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#if OSK
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else
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{
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setuid(0);
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}
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#endif
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if (argc >= i + 1 && argv[i][0] == '-')
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{
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when = argv[i] + 1;
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i++;
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}
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/* preserve everything we're supposed to */
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while (i < argc)
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{
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preserve(argv[i], when);
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i++;
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}
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}
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