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LIST.C
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1992-01-26
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/* List a tar archive.
Copyright (C) 1988 Free Software Foundation
This file is part of GNU Tar.
GNU Tar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GNU Tar is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Tar; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* List a tar archive.
*
* Also includes support routines for reading a tar archive.
*
* this version written 26 Aug 1985 by John Gilmore (ihnp4!hoptoad!gnu).
*
* @(#)list.c 1.31 11/5/87 - gnu
*/
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef MSDOS
#include <sys/file.h>
#endif /* MSDOS */
#ifdef USG
#include <sys/sysmacros.h> /* major() and minor() defined here */
#endif
char *ctime(); /* From libc.a */
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
#include "tar.h"
#include "port.h"
extern FILE *msg_file;
long from_oct(); /* Decode octal number */
void demode(); /* Print file mode */
union record *head; /* Points to current archive header */
struct stat hstat; /* Stat struct corresponding */
int head_standard; /* Tape header is in ANSI format */
void print_header();
void skip_file();
void skip_extended_headers();
extern char *quote_copy_string();
/*
* Main loop for reading an archive.
*/
void
read_and(do_something)
void (*do_something)();
{
int status = 3; /* Initial status at start of archive */
int prev_status;
extern time_t new_time;
char save_linkflag;
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';
if ( !name_match(head->header.name)
|| (f_new_files && hstat.st_mtime<new_time)
|| (f_exclude && check_exclude(head->header.name))) {
int isextended = 0;
if( head->header.linkflag==LF_VOLHDR
|| head->header.linkflag==LF_MULTIVOL
|| head->header.linkflag==LF_NAMES) {
(*do_something)();
continue;
}
/* Skip past it in the archive */
if (head->header.isextended)
isextended = 1;
save_linkflag = head->header.linkflag;
userec(head);
if (isextended) {
/* register union record *exhdr;
for (;;) {
exhdr = findrec();
if (!exhdr->ext_hdr.isextended) {
userec(exhdr);
break;
}
}
userec(exhdr);*/
skip_extended_headers();
}
/* Skip to the next header on the archive */
if(save_linkflag != LF_DIR)
skip_file((long)hstat.st_size);
continue;
}
(*do_something)();
continue;
/*
* If the previous header was good, tell them
* that we are skipping bad ones.
*/
case 0: /* Invalid header */
userec(head);
switch (prev_status) {
case 3: /* Error on first record */
msg("Hmm, this doesn't look like a tar archive.");
/* FALL THRU */
case 2: /* Error after record of zeroes */
case 1: /* Error after header rec */
msg("Skipping to next file header...");
case 0: /* Error after error */
break;
}
continue;
case 2: /* Record of zeroes */
userec(head);
status = prev_status; /* If error after 0's */
if (f_ignorez)
continue;
/* 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()
{
extern char *save_name;
int isextended = 0; /* Flag to remember if head is extended */
/* Save the record */
saverec(&head);
/* Print the header record */
if (f_verbose) {
if (f_verbose > 1)
decode_header(head, &hstat, &head_standard, 0);
print_header();
}
if(f_gnudump && head->header.linkflag==LF_DUMPDIR) {
size_t size, written, check;
char *data;
extern int errno;
extern long save_totsize;
extern long save_sizeleft;
userec(head);
if(f_multivol) {
save_name = head->header.name;
save_totsize=hstat.st_size;
}
for(size = hstat.st_size;size>0;size-=written) {
if(f_multivol)
save_sizeleft=size;
data = findrec()->charptr;
if(data==NULL) {
msg("EOF in archive file?");
break;
}
written = endofrecs()->charptr - data;
if(written>size)
written=size;
errno=0;
check=fwrite(data,sizeof(char), written, msg_file);
userec((union record *)(data+written - 1));
if(check!=written) {
msg_perror("only wrote %ld of %ld bytes to file %s",check, written,head->header.name);
skip_file((long)(size)-written);
break;
}
}
if(f_multivol)
save_name = 0;
saverec((union record **) 0); /* Unsave it */
fputc('\n',msg_file);
fflush(msg_file);
return;
}
saverec((union record **) 0); /* Unsave it */
/* Check to see if we have an extended header to skip over also */
if (head->header.isextended)
isextended = 1;
/* Skip past the header in the archive */
userec(head);
/*
* If we needed to skip any extended headers, do so now, by
* reading extended headers and skipping past them in the
* archive.
*/
if (isextended) {
/* register union record *exhdr;
for (;;) {
exhdr = findrec();
if (!exhdr->ext_hdr.isextended) {
userec(exhdr);
break;
}
userec(exhdr);
}*/
skip_extended_headers();
}
if(f_multivol)
save_name=head->header.name;
/* Skip to the next header on the archive */
skip_file((long) hstat.st_size);
if(f_multivol)
save_name = 0;
}
/*
* 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 record 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;
long from_oct();
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)
hstat.st_size = 0; /* Links 0 size on tape */
else
hstat.st_size = from_oct(1+12, header->header.size);
return 1;
}
if (sum == 8*' ') {
/*
* This is a zeroed record...whole record 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/