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LIST.C
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1988-05-15
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13KB
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577 lines
/*
* List a tar archive.
*
* Also includes support routines for reading a tar archive.
*
* Pubic Domain version written 26 Aug 1985 by John Gilmore (ihnp4!hoptoad!gnu).
* MS-DOS port 2/87 by Eric Roskos.
* Minix port 3/88 by Eric Roskos.
*
* @(#)list.c 1.18 9/23/86 Public Domain - gnu
*/
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef MSDOS
#ifndef V7
#include <sys/file.h>
#endif /* V7 */
#else /* ifdef MSDOS */
#include <fcntl.h>
#endif
char *ctime(); /* From libc.a */
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
#include "tar.h"
long from_oct(); /* Decode octal number */
void demode(); /* Print file mode */
union record *head; /* Points to current archive header */
struct stat hstat[1]; /* Stat struct corresponding */
struct stat *phstat = hstat; /* to overcome construct ACK C can't handle */
void print_header();
void skip_file();
/*
* Main loop for reading an archive.
*/
void
read_and(do_something)
void (*do_something) ();
{
int status = 1;
int prev_status;
char *xname;
char *fixname();
name_gather(); /* Gather all the names */
open_archive(1); /* Open for reading */
for (;;)
{
prev_status = status;
status = read_header();
switch (status)
{
case 1: /* Valid header */
/* We should decode next field (mode) first... */
/* Ensure incoming names are null terminated. */
head->header.name[NAMSIZ - 1] = '\0';
/* make a valid filename for this OS */
xname = fixname(head->header.name);
if (!name_match(head->header.name))
{
/* Skip past it in the archive */
userec(head);
/* Skip to the next header on the archive */
if (head->header.linkflag != LF_BLK &&
head->header.linkflag != LF_CHR)
skip_file((long) phstat->st_size);
continue;
}
(*do_something) (xname);
continue;
/*
* If the previous header was good, tell them that we are
* skipping bad ones.
*/
case 0: /* Invalid header */
case0:
userec(head);
if (prev_status == 1)
{
annorec(stderr, tar);
fprintf(stderr,
"Skipping to next file header...\n");
}
continue;
case 2: /* Block of zeroes */
if (f_ignorez)
goto case0; /* Just skip if asked */
/* FALL THRU */
case EOF: /* End of archive */
break;
}
break;
};
close_archive();
names_notfound(); /* Print names not found */
}
/*
* Print a header record, based on tar options.
*/
void
list_archive(xname)
char *xname;
{
/* Save the record */
saverec(&head);
/* Print the header record */
print_header(xname);
/* Skip past it in the archive */
saverec((union record **) 0); /* Unsave it */
userec(head);
/* Skip to the next header on the archive */
if (head->header.linkflag != LF_BLK &&
head->header.linkflag != LF_CHR) /* no skip if special file - JER */
skip_file((long) phstat->st_size);
}
/*
* Read a record that's supposed to be a header record.
* Return its address in "head", and if it is good, the file's
* size in hstat->st_size.
*
* Return 1 for success, 0 if the checksum is bad, EOF on eof,
* 2 for a block full of zeros (EOF marker).
*
* You must always userec(head) to skip past the header which this
* routine reads.
*/
int
read_header()
{
register int i;
register long sum, recsum;
register char *p;
register union record *header;
header = findrec();
head = header; /* This is our current header */
if (NULL == header)
return EOF;
recsum = from_oct(8, 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++;
}
/* Adjust checksum to count the "chksum" field as blanks. */
for (i = sizeof(header->header.chksum); --i >= 0;)
sum -= 0xFF & header->header.chksum[i];
sum += ' ' * sizeof header->header.chksum;
if (sum == recsum)
{
/*
* Good record. Decode file size and return.
*/
if (header->header.linkflag == LF_LINK)
phstat->st_size = 0; /* Links 0 size on tape */
else
phstat->st_size = from_oct(1 + 12, header->header.size);
return 1;
}
if (sum == 8 * ' ')
{
/*
* This is a zeroed block...whole block is 0's except for the 8
* blanks we faked for the checksum field.
*/
return 2;
}
return 0;
}
/*
* Decode things from a file header record into a "struct stat".
* Also set "*stdp" to !=0 or ==0 depending whether header record is "Unix
* Standard" tar format or regular old tar format.
*
* read_header() has already decoded the checksum and length, so we don't.
*
* If wantug != 0, we want the uid/group info decoded from Unix Standard
* tapes (for extraction). If == 0, we are just printing anyway, so save time.
*/
decode_header(header, st, stdp, wantug)
register union record *header;
register struct stat *st;
int *stdp;
int wantug;
{
st->st_mode = from_oct(8, header->header.mode);
st->st_mtime = from_oct(1 + 12, header->header.mtime);
if (0 == strcmp(header->header.magic, TMAGIC))
{
/* Unix Standard tar archive */
*stdp = 1;
if (wantug)
{
#ifndef MSDOS
#ifndef NONAMES /* if we have names, still support noname tapes - JER */
if (header->header.uname[0]) /* JER */
st->st_uid = finduid(header->header.uname);
else
#endif /* NONAMES */
st->st_uid = from_oct(8, header->header.uid);
#ifndef NONAMES
if (header->header.gname[0]) /* JER */
st->st_gid = findgid(header->header.gname);
else
#endif /* NONAMES */
st->st_gid = from_oct(8, header->header.gid);
#else /* MSDOS */
st->st_uid = st->st_gid = 0; /* unsupported in DOS */
#endif /* MSDOS */
}
#ifndef MSDOS
switch (header->header.linkflag)
case LF_BLK:
case LF_CHR:
st->st_dev = makedev(from_oct(8, header->header.devmajor),
from_oct(8, header->header.devminor));
#endif
}
else
{
/* Old fashioned tar archive */
*stdp = 0;
st->st_uid = from_oct(8, header->header.uid);
st->st_gid = from_oct(8, header->header.gid);
st->st_dev = 0;
}
}
/*
* Quick and dirty octal conversion.
*
* Result is -1 if the field is invalid (all blank, or nonoctal).
*/
long
from_oct(digs, where)
register int digs;
register char *where;
{
register long value;
while (isspace(*where))
{ /* Skip spaces */
where++;
if (--digs <= 0)
return -1; /* All blank field */
}
value = 0;
while (digs > 0 && isodigit(*where))
{ /* Scan til nonoctal */
value = (value << 3) | (*where++ - '0');
--digs;
}
if (digs > 0 && *where && !isspace(*where))
return -1; /* Ended on non-space/nul */
return value;
}
/*
* Actually print it.
*/
#define UGSWIDTH 11 /* min width of User, group, size */
#define DATEWIDTH 19 /* Last mod date */
static int ugswidth = UGSWIDTH; /* Max width encountered so far */
void
print_header(xname)
char *xname;
{
char modes[11];
char *timestamp;
char uform[11], gform[11]; /* These hold formatted ints */
char *user, *group;
char size[24]; /* Holds a formatted long or maj, min */
long longie; /* To make ctime() call portable */
int pad;
int header_std; /* Is header standard or not? */
register int i;
#ifdef MSDOS
char blanks[26];
#endif
annofile(stdout, (char *) NULL);
if (f_verbose)
{
decode_header(head, hstat, &header_std, 0);
/* File type and modes */
modes[0] = '?';
switch (head->header.linkflag)
{
case LF_NORMAL:
case LF_OLDNORMAL:
case LF_LINK:
modes[0] = '-';
if ('/' == head->header.name[strlen(head->header.name) - 1])
modes[0] = 'd';
break;
case LF_DIR:
mod