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Simtel MSDOS 1992 June
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SIMTEL_0692.cdr
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msdos
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filutl
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pdtar.arc
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CREATE.C
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1988-05-15
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685 lines
/*
* Create a tar archive.
*
* Written 25 Aug 1985 by John Gilmore, ihnp4!hoptoad!gnu.
* MS-DOS port 2/87 by Eric Roskos.
* Minix port 3/88 by Eric Roskos.
*
* @(#)create.c 1.19 9/9/86 Public Domain - gnu
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#ifndef MSDOS
#include <pwd.h>
#include <grp.h>
#else /* ifdef MSDOS */
#include <assert.h>
#endif
#ifdef BSD42
#include <sys/dir.h>
#else
/*
* FIXME: On other systems there is no standard place for the header file
* for the portable directory access routines. Change the #include line
* below to bring it in from wherever it is. Of course, where it is
* on BSD is the standard place ... :-)?
*/
#ifdef V7
#include "dir.h"
#else
#include "ndir.h"
#endif /* V7 */
#endif /* !BSD42 */
#ifdef USG
#ifdef MSDOS
/* DOS doesn't have minor device numbers */
#define major(n) n
#define minor(n) 0
#else
#include <sys/sysmacros.h> /* major() and minor() defined here */
#endif
#endif
/*
* V7 doesn't have a #define for this.
*/
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#include "tar.h"
/*
* If there are no symbolic links, there is no lstat(). Use stat().
*/
#ifndef S_IFLNK
#define lstat stat
#endif
extern char *malloc();
extern char *strcpy();
extern char *strncpy();
extern int errno;
union record *start_header();
void finish_header();
void finduname();
void findgname();
char *name_next();
void to_oct();
void
create_archive()
{
register char *p;
open_archive(0); /* Open for writing */
while (p = name_next())
{
dump_file(p);
}
write_eot();
close_archive();
name_close();
}
#ifdef MSDOS
/*
* count the number of bytes in file f. This is done because, with DOS,
* the results of the stat call may not reflect the actual file size, due
* to conversion of CR/LF pairs to plain LF's. The *only* way to find this
* out is to read the whole file in order to let the MSC library routines
* determine how many characters will actually be in the file...
*/
long
countbytes(f)
int f;
{
long cb;
int n;
char buf[512];
assert(lseek(f, 0L, 1) == 0L);
for (cb = 0; (n = read(f, buf, sizeof(buf))) > 0;)
cb += n;
lseek(f, 0L, 0);
assert(lseek(f, 0L, 1) == 0L);
return (cb);
}
#endif
/*
* Dump a single file. If it's a directory, recurse.
* Result is 1 for success, 0 for failure.
*/
int
dump_file(p)
char *p; /* File name to dump */
{
struct stat statbuff[1];
struct stat *statbuf = statbuff;
union record *header;
char type;
/*
* Use stat if following (rather than dumping) 4.2BSD's symbolic links.
* Otherwise, use lstat (which, on non-4.2 systems, is #define'd to stat
* anyway.
*/
if (0 != f_follow_links ? stat(p, statbuf) : lstat(p, statbuf))
{
badperror:
perror(p);
badfile:
errors++;
return 0;
}
switch (statbuf->st_mode & S_IFMT)
{
case S_IFREG: /* Regular file */
{
int f; /* File descriptor */
int bufsize, count;
register long sizeleft;
register union record *start;
long exp, actl; /* byte counts for file size errs */
int nbytes, need; /* for block read loop */
int n; /* # bytes read in this read() call */
char *bufp; /* where to start this read in buf */
/*
* Handle a regular file with multiple links.
*
* We maintain a list of all such files that we've written so far.
* Any time we see another, we check the list and avoid dumping
* the data again if we've done it once already.
*/
if (statbuf->st_nlink > 1)
{
register struct link *lp;
/*
* First quick and dirty. Hashing, etc later FIXME
*/
for (lp = linklist; lp; lp = lp->next)
{
if (lp->ino == statbuf->st_ino &&
lp->dev == statbuf->st_dev)
{
/* We found a link. */
statbuf->st_size = 0;
header = start_header(p, statbuf);
if (header == NULL)
goto badfile;
strcpy(header->header.linkname,
lp->name);
header->header.linkflag = LF_LINK;
finish_header(header);
if (f_verbose)
annorec(stdout, (char *) NULL);
printf("%s link to %s\n",
p, lp->name);
/*
* Maybe remove from list after all links found?
*/
/*
* If so, have to compare names in case he dumps
* twice.
*/
/*
* Later: I don't understand the above. If she dumps
* the file twice, it would be BAD to dump it the
* second time as a link... gnu 25Jul86
*/
/* FIXME */
goto donefile;
}
}
/* Not found. Add it to the list. */
lp = (struct link *) malloc((unsigned)
(strlen(p) + sizeof(struct link) - NAMSIZ));
lp->ino = statbuf->st_ino;
lp->dev = statbuf->st_dev;
strcpy(lp->name, p);
lp->next = linklist;
linklist = lp;
}
sizeleft = statbuf->st_size;
#ifdef NOTDEF /* don't understand reason for following,
* causes abort */
/* Don't bother opening empty, world readable files. */
if (sizeleft > 0 || 0444 != (0444 & statbuf->st_mode))
{
#endif
f = open(p, O_RDONLY | convmode(p));
if (f < 0)
goto badperror;
#ifdef NOTDEF
}
else
{
f = -1;
}
#endif
#ifdef MSDOS
/*
* See comment before countbytes(), above.
*/
if (convmode(p) & O_TEXT)
{
statbuf->st_size = countbytes(f);
sizeleft = statbuf->st_size;
}
#endif
exp = sizeleft; /* number of bytes we expect to see */
actl = 0; /* number of bytes we really saw */
header = start_header(p, statbuf);
if (header == NULL)
goto badfile;
finish_header(header);
while (sizeleft > 0)
{
start = findrec();
bufsize = endofrecs()->charptr - start->charptr;
if (sizeleft < bufsize)
bufsize = sizeleft;
/*
* use a read loop since reads < number requested do NOT
* imply EOF as John assumed -- jer 22Aug87
*/
need = bufsize;
bufp = start->charptr;
count = 0;
do
{
n = read(f, bufp, need);
if (n > 0)
{
count += n;
bufp += n;
need -= n;
}
} while (need > 0 && n > 0);
if (n < 0)
{
annorec(stderr, tar);
fprintf(stderr,
"read error at byte %ld, reading %d bytes, in file ",
statbuf->st_size - sizeleft,
bufsize);
perror(p); /* FIXME */
goto padit;
}
actl += count;
sizeleft -= count;
userec(start + (count - 1) / RECORDSIZE);
if (count == bufsize)
continue;
annorec(stderr, tar);
fprintf(stderr,
"%s: file size error: expected %ld, read %ld.\n",
p, exp, actl);
fprintf(stderr,
"%s: file shrunk by %d bytes, padding with zeros.\n",
p, sizeleft);
goto padit; /* Short read */
}
if (f >= 0)
(void) close(f);
/* Clear last block garbage to zeros, FIXME */
#ifdef OLDVERBOSE
if (f_verbose)
{
annorec(stdout, (char *) NULL);
printf("%s\n", p);
}
#endif
donefile:
break;
/*
* File shrunk or gave error, pad out tape to match the size we
* specified in the header. ??? Doesn't do that here! Must be a
* FIXME. -- jer
*/
padit:
abort();
}
#ifdef S_IFLNK
case S_IFLNK: /* Symbolic link */
{
int size;
statbuf->st_size = 0; /* Force 0 size on symlink */
header = start_header(p, statbuf);
if (header == NULL)
goto badfile;
size = readlink(p, header->header.linkname, NAMSIZ);
if (size < 0)
goto badperror;
if (size == NAMSIZ)
{
annorec(stderr, tar);
fprintf(stderr,
"%s: symbolic link too long\n", p);
break;
}
header->header.linkname[size] = '\0';
header->header.linkflag = LF_SYMLINK;
finish_header(header); /* Nothing more to do to it */
#ifdef OLDVERBOSE
if (f_verbose)
{
annorec(stdout, (char *) NULL);
printf("%s\n", p);
}
#endif
}
break;
#endif
case S_IFDIR: /* Directory */
{
register DIR *dirp;
register struct direct *d;
char namebuf[NAMSIZ + 2];
register int len;
/* Build new prototype name */
strncpy(namebuf, p, sizeof(namebuf));
len = strlen(namebuf);
while (len >= 1 && '/' == namebuf[len - 1])
len--; /* Delete trailing slashes */
namebuf[len++] = '/'; /* Now add exactly one back */
/*
* Output directory header record with permissions FIXME, do this
* AFTER files, to avoid R/O dir problems? If Unix Std format,
* don't put / on end of dir name If old archive format, don't
* write record at all.
*/
if (!f_oldarch)
{
statbuf->st_size = 0; /* Force 0 size on dir */
/*
* If people could really read standard archives, this should
* be: (FIXME) header = start_header(f_standard? p:
* namebuf, statbuf); but since they'd interpret LF_DIR
* records as regular files, we'd better put the / on the
* name.
*/
header = start_header(namebuf, statbuf);
if (header == NULL)
goto badfile; /* eg name too long */
if (f_standard)
{
header->header.linkflag = LF_DIR;
}
finish_header(header); /* Done with directory header */
}
#ifdef OLDVERBOSE
if (f_verbose)
{
annorec(stdout, (char *) NULL);
printf("%s\n", p);
}
#endif
/*
* Hack to remove "./" from the front of all the file names
*/
if (len == 2 && namebuf[0] == '.')
{
len = 0;
}
/* Now output all the files in the directory */
errno = 0;
dirp = opendir(p);
if (!dirp)
{
if (errno)
{
perror(p);
}
else
{
annorec(stderr, tar);
fprintf(stderr, "%s: error opening directory",
p);
}
break;
}
/* Should speed this up by cd-ing into the dir, FIXME */
while (NULL != (d = readdir(dirp)))
{
/* Skip . and .. */
if (d->d_name[0] == '.')
{
if (d->d_name[1] == '\0')
continue;
if (d->d_name[1] == '.')
{
if (d->d_name[2] == '\0')
continue;
}
}
if (strlen(d->d_name) + len >= NAMSIZ)
{
annorec(stderr, tar);
fprintf(stderr, "%s%s: name too long\n",
namebuf, d->d_name);
continue;
}
strcpy(namebuf + len, d->d_name);
dump_file(namebuf);
}
closedir(dirp);
}
break;
case S_IFCHR: /* Character special file */
type = LF_CHR;
goto easy;
#ifdef S_IFBLK
case S_IFBLK: /* Block special file */
type = LF_BLK;
goto easy;
#endif
#ifdef S_IFIFO
case S_IFIFO: /* Fifo special file */
type = LF_FIFO;
#endif /* S_IFIFO */
easy:
if (!f_standard)
goto unknown;
#if 0
/* this was a bad kludge, it had the side-effect of causing
* skipping of the data part of files when a "list" was
* done to work right for special files. But, Minix needs
* this size since it's used to size the device. - JER */
statbuf->st_size = 0; /* Force 0 size */
#endif
header = start_header(p, statbuf);
if (header == NULL)
goto badfile; /* eg name too long */
header->header.linkflag = type;
if (type != LF_FIFO)
{
to_oct((long) major(statbuf->st_rdev), 8,
header->header.devmajor);
to_oct((long) minor(statbuf->st_rdev), 8,
header->header.devminor);
}
finish_header(header);
#ifdef OLDVERBOSE
if (f_verbose)
{
annorec(stdout, (char *) NULL);
printf("%s\n", p);
}
#endif
break;
default:
unknown:
annorec(stderr, tar);
fprintf(stderr,
"%s: Unknown file type; file ignored.\n", p);
break;
}
return 1; /* Success */
}
/*
* Make a header block for the file name whose stat info is st .
* Return header pointer for success, NULL if the name is too long.
*/
union record *
start_header(name, st)
char *name;
register struct stat *st;
{
register union record *header;
extern struct stat hstat[1];
hstat[0] = *st; /* save stat for verbose-mode listing */
header = (union record *) findrec();
bzero(header->charptr, sizeof(*header)); /* XXX speed up */
strcpy(header->header.name, name);
if (header->header.name[NAMSIZ - 1])
{
annorec(stderr, tar);
fprintf(stderr, "%s: name too long\n", name);
return NULL;
}
#ifdef MSDOS
to_oct((long) (st->st_mode & ~(S_IFMT | DOSUMASK)),
8, header->header.mode);
#else
to_oct((long) (st->st_mode & ~S_IFMT),
8, header->header.mode);
#endif
to_oct((long) st->st_uid, 8, header->header.uid);
to_oct((long) st->st_gid, 8, header->header.gid);
to_oct((long) st->st_size, 1 + 12, header->header.size);
to_oct((long) st->st_mtime, 1 + 12, header->header.mtime);
/* header->header.linkflag is left as null */
/* Fill in new Unix Standard fields if desired. */
if (f_standard)
{
header->header.linkflag = LF_NORMAL; /* New default */
strcpy(header->header.magic, TMAGIC); /* Mark as Unix Std */
#ifndef NONAMES
finduname(header->header.uname, st->st_uid);
findgname(header->header.gname, st->st_gid);
#else
/* don't leave garbage in if no name - JER */
header->header.uname[0] = '\0';
header->header.gname[0] = '\0';
#endif
}
return header;
}
/*
* Finish off a filled-in header block and write it out.
*/
void
finish_header(header)
register union record *header;
{
register int i, sum;
register char *p;
extern union record *head;
bcopy(CHKBLANKS, header->header.chksum, sizeof(header->header.chksum));
sum = 0;
p = header->charptr;
for (i = sizeof(*header); --i >= 0;)
{
/*
* We can't use unsigned char here because of old compilers, e.g. V7.
*/
sum += 0xFF & *p++;
}
/*
* Fill in the checksum field. It's formatted differently from the other
* fields: it has [6] digits, a null, then a space -- rather than
* digits, a space, then a null. We use to_oct then write the null in
* over to_oct's space. The final space is already there, from
* checksumming, and to_oct doesn't modify it.
*
* This is a fast way to do: (void) sprintf(header->header.chksum, "%6o",
* sum);
*/
to_oct((long) sum, 8, header->header.chksum);
header->header.chksum[6] = '\0'; /* Zap the space */
head = header;
if (f_verbose)
print_header(header->header.name);
userec(header);
return;
}
/*
* Quick and dirty octal conversion.
* Converts long "value" into a "digs"-digit field at "where",
* including a trailing space and room for a null. "digs"==3 means
* 1 digit, a space, and room for a null.
*
* We assume the trailing null is already there and don't fill it in.
* This fact is used by start_header and finish_header, so don't change it!
*
* This should be equivalent to:
* (void) sprintf(where, "%*lo ", digs-2, value);
* except that sprintf fills in the trailing null and we don't.
*/
void
to_oct(value, digs, where)
register long value;
register int digs;
register char *where;
{
--digs; /* Trailing null slot is left alone */
where[--digs] = ' '; /* Put in the space, though */
/* Produce the digits -- at least one */
do
{
where[--digs] = '0' + (value & 7); /* one octal digit */
value >>= 3;
} while (digs > 0 && value != 0);
/* Leading spaces, if necessary */
while (digs > 0)
where[--digs] = ' ';
}
/*
* Write the EOT block(s).
*/
write_eot()
{
union record *p;
p = findrec();
bzero(p->charptr, RECORDSIZE);
userec(p);
/* FIXME, only one EOT block should be needed. */
p = findrec();
bzero(p->charptr, RECORDSIZE);
userec(p);
}