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386BSD 0.1 development
[unix-history] / usr / src / usr.bin / tar / list.c
/* 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/group info decoded from Unix Standard
* tapes (for extraction). If == 0, we are just printing anyway, so save time.
*
* decode_header should NOT be called twice for the same record, since the
* two calls might use different "wantug" values and thus might end up with
* different uid/gid for the two calls. If anybody wants the uid/gid they
* should decode it first, and other callers should decode it without uid/gid
* before calling a routine, e.g. print_header, that assumes decoded data.
*/
decode_header(header, st, stdp, wantug)
register union record *header;
register struct stat *st;
int *stdp;
int wantug;
{
long from_oct();
st->st_mode = from_oct(8, header->header.mode);
st->st_mtime = from_oct(1+12, header->header.mtime);
if(f_gnudump) {
st->st_atime = from_oct(1+12, header->header.atime);
st->st_ctime = from_oct(1+12, header->header.ctime);
}
if (0==strcmp(header->header.magic, TMAGIC)) {
/* Unix Standard tar archive */
*stdp = 1;
if (wantug) {
#ifdef NONAMES
st->st_uid = from_oct(8, header->header.uid);
st->st_gid = from_oct(8, header->header.gid);
#else
st->st_uid = finduid(header->header.uname);
st->st_gid = findgid(header->header.gname);
#endif
}
switch (header->header.linkflag) {
case LF_BLK: case LF_CHR:
st->st_rdev = makedev(from_oct(8, header->header.devmajor),
from_oct(8, header->header.devminor));
}
} 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_rdev = 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.
*
* Plain and fancy file header block logging.
* Non-verbose just prints the name, e.g. for "tar t" or "tar x".
* This should just contain file names, so it can be fed back into tar
* with xargs or the "-T" option. The verbose option can give a bunch
* of info, one line per file. I doubt anybody tries to parse its
* format, or if they do, they shouldn't. Unix tar is pretty random here
* anyway.
*
* Note that print_header uses the globals <head>, <hstat>, and
* <head_standard>, which must be set up in advance. This is not very clean
* and should be cleaned up. FIXME.
*/
#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()
{
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;
char *name;
extern long baserec;
if(f_sayblock)
fprintf(msg_file,"rec %10d: ",baserec + (ar_record - ar_block));
/* annofile(msg_file, (char *)NULL); */
if (f_verbose <= 1) {
/* Just the fax, mam. */
char *name;
name=quote_copy_string(head->header.name);
if(name==0)
name=head->header.name;
fprintf(msg_file, "%s\n", name);
if(name!=head->header.name)
free(name);
} else {
/* File type and modes */
modes[0] = '?';
switch (head->header.linkflag) {
case LF_VOLHDR:
modes[0]='V';
break;
case LF_MULTIVOL:
modes[0]='M';
break;
case LF_NAMES:
modes[0]='N';
break;
case LF_SPARSE:
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_DUMPDIR:modes[0] = 'd'; break;
case LF_DIR: modes[0] = 'd'; break;
case LF_SYMLINK:modes[0] = 'l'; break;
case LF_BLK: modes[0] = 'b'; break;
case LF_CHR: modes[0] = 'c'; break;
case LF_FIFO: modes[0] = 'p'; break;
case LF_CONTIG: modes[0] = 'C'; break;
}
demode((unsigned)hstat.st_mode, modes+1);
/* Timestamp */
longie = hstat.st_mtime;
timestamp = ctime(&longie);
timestamp[16] = '\0';
timestamp[24] = '\0';
/* User and group names */
if (*head->header.uname && head_standard) {
user = head->header.uname;
} else {
user = uform;
(void)sprintf(uform, "%d", (int)hstat.st_uid);
}
if (*head->header.gname && head_standard) {
group = head->header.gname;
} else {
group = gform;
(void)sprintf(gform, "%d", (int)hstat.st_gid);
}
/* Format the file size or major/minor device numbers */
switch (head->header.linkflag) {
case LF_CHR:
case LF_BLK:
(void)sprintf(size, "%d,%d",
major(hstat.st_rdev),
minor(hstat.st_rdev));
break;
case LF_SPARSE:
(void)sprintf(size, "%ld",
from_oct(1+12, head->header.realsize));
break;
default:
(void)sprintf(size, "%ld", (long)hstat.st_size);
}
/* Figure out padding and print the whole line. */
pad = strlen(user) + strlen(group) + strlen(size) + 1;
if (pad > ugswidth) ugswidth = pad;
name = quote_copy_string(head->header.name);
if(!name)
name=head->header.name;
fprintf(msg_file, "%s %s/%s %*s%s %s %s %.*s",
modes,
user,
group,
ugswidth - pad,
"",
size,
timestamp+4, timestamp+20,
sizeof(head->header.name),
name);
if(name!=head->header.name)
free(name);
switch (head->header.linkflag) {
case LF_SYMLINK:
name=quote_copy_string(head->header.linkname);
if(!name)
name=head->header.linkname;
fprintf(msg_file, " -> %s\n", name);
if(name!=head->header.linkname)
free(name);
break;
case LF_LINK:
name=quote_copy_string(head->header.linkname);
if(!name)
name=head->header.linkname;
fprintf(msg_file, " link to %s\n", head->header.linkname);
if(name!=head->header.linkname)
free(name);
break;
default:
fprintf(msg_file, " unknown file type '%c'\n",
head->header.linkflag);
break;
case LF_OLDNORMAL:
case LF_NORMAL:
case LF_SPARSE:
case LF_CHR:
case LF_BLK:
case LF_DIR:
case LF_FIFO:
case LF_CONTIG:
case LF_DUMPDIR:
putc('\n', msg_file);
break;
case LF_VOLHDR:
fprintf(msg_file, "--Volume Header--\n");
break;
case LF_MULTIVOL:
fprintf(msg_file, "--Continued at byte %ld--\n",from_oct(1+12,head->header.offset));
break;
case LF_NAMES:
fprintf(msg_file,"--Mangled file names--\n");
break;
}
}
fflush(msg_file);
}
/*
* Print a similar line when we make a directory automatically.
*/
void
pr_mkdir(pathname, length, mode)
char *pathname;
int length;
int mode;
{
char modes[11];
char *name;
extern long baserec;
if (f_verbose > 1) {
/* File type and modes */
modes[0] = 'd';
demode((unsigned)mode, modes+1);
if(f_sayblock)
fprintf(msg_file,"rec %10d: ",baserec + (ar_record - ar_block));
/* annofile(msg_file, (char *)NULL); */
name=quote_copy_string(pathname);
if(!name)
name=pathname;
fprintf(msg_file, "%s %*s %.*s\n",
modes,
ugswidth+DATEWIDTH,
"Creating directory:",
length,
pathname);
if(name!=pathname)
free(name);
}
}
/*
* Skip over <size> bytes of data in records in the archive.
*/
void
skip_file(size)
register long size;
{
union record *x;
extern long save_totsize;
extern long save_sizeleft;
if(f_multivol) {
save_totsize=size;
save_sizeleft=size;
}
while (size > 0) {
x = findrec();
if (x == NULL) { /* Check it... */
msg("Unexpected EOF on archive file");
exit(EX_BADARCH);
}
userec(x);
size -= RECORDSIZE;
if(f_multivol)
save_sizeleft-=RECORDSIZE;
}
}
void
skip_extended_headers()
{
register union record *exhdr;
for (;;) {
exhdr = findrec();
if (!exhdr->ext_hdr.isextended) {
userec(exhdr);
break;
}
userec (exhdr);
}
}
/*
* Decode the mode string from a stat entry into a 9-char string and a null.
*/
void
demode(mode, string)
register unsigned mode;
register char *string;
{
register unsigned mask;
register char *rwx = "rwxrwxrwx";
for (mask = 0400; mask != 0; mask >>= 1) {
if (mode & mask)
*string++ = *rwx++;
else {
*string++ = '-';
rwx++;
}
}
if (mode & S_ISUID)
if (string[-7] == 'x')
string[-7] = 's';
else
string[-7] = 'S';
if (mode & S_ISGID)
if (string[-4] == 'x')
string[-4] = 's';
else
string[-4] = 'S';
if (mode & S_ISVTX)
if (string[-1] == 'x')
string[-1] = 't';
else
string[-1] = 'T';
*string = '\0';
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.