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minix/commands/simple/tar.c
Ben Gras 9865aeaa79 Initial revision
2005-04-21 14:53:53 +00:00

1107 lines
27 KiB
C
Executable file
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/* tar - tape archiver Author: Michiel Huisjes */
/* Usage: tar [cxt][vo][F][f] tapefile [files]
*
* attempt to make tar to conform to POSIX 1003.1
* disclaimer: based on an old (1986) POSIX draft.
* Klamer Schutte, 20/9/89
*
* Changes:
* Changed to handle the original minix-tar format. KS 22/9/89
* Changed to handle BSD4.3 tar format. KS 22/9/89
* Conform to current umask if not super-user. KS 22/9/89
* Update usage message to show f option KS 22/9/89
*
*
* 1) tar will back itself up, should check archive inode num(&dev) and
then check the target inode number. In verbose mode, issue
warning, in all cases ignore target.
marks@mgse Mon Sep 25 10:38:58 CDT 1989
added global varaibles, made changes to main() and add_file();
maks@mgse Mon Sep 25 12:09:20 CDT 1989
2) tar will not notice that a file has changed size while it was being
backed up. should issue warning.
marks@mgse Mon Sep 25 10:38:58 CDT 1989
3) the 'f' option was not documented in usage[].
marks@mgse Mon Sep 25 12:03:20 CDT 1989
changed both usage[] defines. Why are there two (one is commented out)?
( deleted by me (was done twice) -- KS, 2/10/89 )
*
* changed stat on tar_fd to an fstat KS 2/10/89
* deleted mkfifo() code -- belongs in libc.a KS 2/10/89
* made ar_dev default to -1 : an illegal device KS 2/10/89
* made impossible to chown if normal user KS 2/10/89
* if names in owner fields not known use numirical values KS 2/10/89
* creat with mask 666 -- use umask if to liberal KS 2/10/89
* allow to make directories as ../directory KS 2/10/89
* allow tmagic field to end with a space (instead of \0) KS 2/10/89
* correct usage of tmagic field KS 3/10/89
* made mkdir() to return a value if directory == "." KS 3/10/89
* made lint complains less (On a BSD 4.3 system) KS 3/10/89
* use of directory(3) routines KS 3/10/89
* deleted use of d_namlen selector of struct dirent KS 18/10/89
* support mknod4(2) EC 7/7/90
* forget inodes when link count expires EC 6/4/91
* don't remember directories *twice*!
* added 'p' flag to ignore umask for normal user KJB 6/10/92
* mknod4(2) out KJB 30/10/94
* added 'D' flag to not recurse into directories KJB 19/12/94
* status output to stdout unless 'tar cvf -' KJB 3/5/97
*
* Bugs:
* verbose mode is not reporting consistent
* code needs cleanup
* prefix field is not used
* timestamp of a directory will not be correct if there are files to be
* unpacked in the directory
* (add you favorite bug here (or two (or three (or ...))))
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <tar.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/wait.h>
#include <stdio.h> /* need NULL */
#include <errno.h>
#define POSIX_COMP /* POSIX compatible */
#define DIRECT_3 /* use directory(3) routines */
#ifdef DIRECT_3
#ifndef BSD
/* To all minix users: i am sorry, developed this piece of code on a
* BSD system. KS 18/10/89 */
#include <dirent.h>
#define direct dirent /* stupid BSD non-POSIX compatible name! */
#else /* BSD */
#include <sys/dir.h>
#include <dir.h>
#endif /* BSD */
#endif /* DIRECT_3 */
#ifdef S_IFIFO
#define HAVE_FIFO /* have incorporated Simon Pooles' changes */
#endif
#ifdef S_IFLNK
#define HAVE_SYMLINK
#endif
typedef char BOOL;
#define TRUE 1
#define FALSE 0
#define STRING_SIZE 256 /* string buffer size */
#define HEADER_SIZE TBLOCK
#define NAME_SIZE NAMSIZ
/* #define BLOCK_BOUNDARY 20 -- not in POSIX ! */
typedef union hblock HEADER;
/* Make the MINIX member names overlap to the POSIX names */
#define m_name name
#define m_mode mode
#define m_uid uid
#define m_gid gid
#define m_size size
#define m_time mtime
#define m_checksum chksum
#define m_linked typeflag
#define m_link linkname
#define hdr_block dummy
#define m header
#define member dbuf
#if 0 /* original structure -- see tar.h for new
* structure */
typedef union {
char hdr_block[HEADER_SIZE];
struct m {
char m_name[NAME_SIZE];
char m_mode[8];
char m_uid[8];
char m_gid[8];
char m_size[12];
char m_time[12];
char m_checksum[8];
char m_linked;
char m_link[NAME_SIZE];
} member;
} HEADER;
#endif
/* Structure used to note links */
struct link {
ino_t ino;
dev_t dev;
nlink_t nlink;
struct link *next;
char name[1];
} *link_top = NULL;
HEADER header;
#define INT_TYPE (sizeof(header.member.m_uid))
#define LONG_TYPE (sizeof(header.member.m_size))
#define NIL_HEADER ((HEADER *) 0)
#define NIL_PTR ((char *) 0)
#define TBLOCK_SIZE TBLOCK
#define flush() print(NIL_PTR)
BOOL show_fl, creat_fl, ext_fl;
int tar_fd;
/* Char usage[] = "Usage: tar [cxt] tarfile [files]."; */
char usage[] = "Usage: tar [cxt][vo][F][f] tarfile [files].";
char io_buffer[TBLOCK_SIZE];
char path[NAME_SIZE];
char pathname[NAME_SIZE];
int force_flag = 0;
#ifdef ORIGINAL_DEFAULTS
int chown_flag = 1;
int verbose_flag = 1;
#else
int chown_flag = 0;
int verbose_flag = 0;
#endif
int norec_flag = 0;
/* Make sure we don't tar ourselves. marks@mgse Mon Sep 25 12:06:28 CDT 1989 */
ino_t ar_inode; /* archive inode number */
dev_t ar_dev; /* archive device number */
int total_blocks;
int u_mask; /* one's complement of current umask */
#define block_size() (int) ((convert(header.member.m_size, LONG_TYPE) \
+ (long) TBLOCK_SIZE - 1) / (long) TBLOCK_SIZE)
_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(void error, (char *s1, char *s2));
_PROTOTYPE(BOOL get_header, (void));
_PROTOTYPE(void tarfile, (void));
_PROTOTYPE(void skip_entry, (void));
_PROTOTYPE(void extract, (char *file));
_PROTOTYPE(void delete, (char *file));
_PROTOTYPE(void do_chown, (char *file));
_PROTOTYPE(void timestamp, (char *file));
_PROTOTYPE(void copy, (char *file, int from, int to, long bytes));
_PROTOTYPE(long convert, (char str[], int type));
_PROTOTYPE(int checksum, (void));
_PROTOTYPE(int is_dir, (char *file));
_PROTOTYPE(char *path_name, (char *file));
_PROTOTYPE(void add_path, (char *name));
_PROTOTYPE(void add_file, (char *file));
_PROTOTYPE(void verb_print, (char *s1, char *s2));
_PROTOTYPE(void add_close, (int fd));
_PROTOTYPE(int add_open, (char *file, struct stat * st));
_PROTOTYPE(void make_header, (char *file, struct stat * st));
_PROTOTYPE(void is_added, (struct stat * st, char *file));
_PROTOTYPE(void is_deleted, (struct stat * st));
_PROTOTYPE(char *is_linked, (struct stat * st));
_PROTOTYPE(void clear_header, (void));
_PROTOTYPE(void adjust_boundary, (void));
_PROTOTYPE(void mread, (int fd, char *address, int bytes));
_PROTOTYPE(void mwrite, (int fd, char *address, int bytes));
_PROTOTYPE(int bread, (int fd, char *address, int bytes));
_PROTOTYPE(int bwrite, (int fd, char *address, int bytes));
_PROTOTYPE(void print, (char *str));
_PROTOTYPE(char *num_out, (long number));
_PROTOTYPE(void string_print, (char *buffer, char *fmt,...));
void error(s1, s2)
char *s1, *s2;
{
string_print(NIL_PTR, "%s %s\n", s1, s2 ? s2 : "");
flush();
exit(1);
}
int main(argc, argv)
int argc;
register char *argv[];
{
register char *mem_name;
register char *ptr;
struct stat st;
int i;
if (argc < 3) error(usage, NIL_PTR);
for (ptr = argv[1]; *ptr; ptr++) {
switch (*ptr) {
case 'c': creat_fl = TRUE; break;
case 'x': ext_fl = TRUE; break;
case 't': show_fl = TRUE; break;
case 'v': /* verbose output -Dal */
verbose_flag = !verbose_flag;
break;
case 'o': /* chown/chgrp files -Dal */
chown_flag = TRUE;
break;
case 'F': /* IGNORE ERRORS -Dal */
force_flag = TRUE;
break;
case 'f': /* standard U*IX usage -KS */
break;
case 'p': /* restore file modes right, ignore umask. */
(void) umask(0);
break;
case 'D': /* do not recursively add directories. */
norec_flag = TRUE;
break;
default: error(usage, NIL_PTR);
}
}
if (creat_fl + ext_fl + show_fl != 1) error(usage, NIL_PTR);
if (strcmp(argv[2], "-") == 0)/* only - means stdin/stdout - KS */
tar_fd = creat_fl ? 1 : 0; /* '-' means used
* stdin/stdout -Dal */
else
tar_fd = creat_fl ? creat(argv[2], 0666) : open(argv[2], O_RDONLY);
if (tar_fd < 0) error("Cannot open ", argv[2]);
if (geteuid()) { /* check if super-user */
int save_umask;
save_umask = umask(0);
u_mask = ~save_umask;
umask(save_umask);
chown_flag = TRUE; /* normal user can't chown */
} else
u_mask = ~0; /* don't restrict if 'privileged utility' */
ar_dev = -1; /* impossible device nr */
if (creat_fl) {
if (tar_fd > 1 && fstat(tar_fd, &st) < 0)
error("Can't stat ", argv[2]); /* will never be here,
* right? */
else { /* get archive inode & device */
ar_inode = st.st_ino; /* save files inode */
ar_dev = st.st_dev; /* save files device */
} /* marks@mgse Mon Sep 25 11:30:45 CDT 1989 */
for (i = 3; i < argc; i++) {
add_file(argv[i]);
path[0] = '\0';
}
adjust_boundary();
} else if (ext_fl) {
/* Extraction code moved here from tarfile() MSP */
while (get_header()) {
mem_name = header.member.m_name;
if (is_dir(mem_name)) {
for (ptr = mem_name; *ptr; ptr++);
*(ptr - 1) = '\0';
header.dbuf.typeflag = '5';
}
for (i = 3; i < argc; i++)
if (!strncmp(argv[i], mem_name, strlen(argv[i])))
break;
if (argc == 3 || (i < argc)) {
extract(mem_name);
} else if (header.dbuf.typeflag == '0' ||
header.dbuf.typeflag == 0 ||
header.dbuf.typeflag == ' ')
skip_entry();
flush();
}
} else
tarfile(); /* tarfile() justs prints info. now MSP */
flush();
return(0);
}
BOOL get_header()
{
register int check;
mread(tar_fd, (char *) &header, sizeof(header));
if (header.member.m_name[0] == '\0') return FALSE;
if (force_flag) /* skip checksum verification -Dal */
return TRUE;
check = (int) convert(header.member.m_checksum, INT_TYPE);
if (check != checksum()) error("Tar: header checksum error.", NIL_PTR);
return TRUE;
}
/* Tarfile() just lists info about archive now; as of the t flag. */
/* Extraction has been moved into main() as that needs access to argv[] */
void tarfile()
{
register char *mem_name;
while (get_header()) {
mem_name = header.member.m_name;
string_print(NIL_PTR, "%s%s", mem_name,
(verbose_flag ? " " : "\n"));
switch (header.dbuf.typeflag) {
case '1':
verb_print("linked to", header.dbuf.linkname);
break;
case '2':
verb_print("symbolic link to", header.dbuf.linkname);
break;
case '6': verb_print("", "fifo"); break;
case '3':
case '4':
if (verbose_flag) {
char sizebuf[TSIZLEN + 1];
strncpy(sizebuf, header.dbuf.size, (size_t) TSIZLEN);
sizebuf[TSIZLEN] = 0;
string_print(NIL_PTR,
"%s special file major %s minor %s\n",
(header.dbuf.typeflag == '3' ?
"character" : "block"),
header.dbuf.devmajor,
header.dbuf.devminor,
sizebuf);
}
break;
case '0': /* official POSIX */
case 0: /* also mentioned in POSIX */
case ' ': /* ofetn used */
if (!is_dir(mem_name)) {
if (verbose_flag)
string_print(NIL_PTR, "%d tape blocks\n",
block_size());
skip_entry();
break;
} else /* FALL TROUGH */
case '5':
verb_print("", "directory");
break;
default:
string_print(NIL_PTR, "not recogised item %d\n",
header.dbuf.typeflag);
}
flush();
}
}
void skip_entry()
{
register int blocks = block_size();
while (blocks--) (void) bread(tar_fd, io_buffer, TBLOCK_SIZE);
}
void extract(file)
register char *file;
{
register int fd, r;
char *pd1, *pd2; /* walk thru failed directory path */
switch (header.dbuf.typeflag) {
case '1': /* Link */
delete(file);
if (link(header.member.m_link, file) < 0)
string_print(NIL_PTR, "Cannot link %s to %s: %s\n",
header.member.m_link, file, strerror(errno));
else if (verbose_flag)
string_print(NIL_PTR, "Linked %s to %s\n",
header.member.m_link, file);
return;
case '5': /* directory */
if (!(file[0] == '.' && file[1] == '\0')) delete(file);
if ((file[0] == '.' && file[1] == '\0') || mkdir(file, 0700) == 0) {
do_chown(file);
verb_print("created directory", file);
} else {
string_print(NIL_PTR, "Can't make directory %s: %s\n",
file, strerror(errno));
}
return;
case '3': /* character special */
case '4': /* block special */
{
int dmajor, dminor, mode;
dmajor = (int) convert(header.dbuf.devmajor, INT_TYPE);
dminor = (int) convert(header.dbuf.devminor, INT_TYPE);
mode = (header.dbuf.typeflag == '3' ? S_IFCHR : S_IFBLK);
delete(file);
if (mknod(file, mode, (dmajor << 8 | dminor)) == 0) {
if (verbose_flag) string_print(NIL_PTR,
"made %s special file major %s minor %s\n",
(header.dbuf.typeflag == '3' ?
"character" : "block"),
header.dbuf.devmajor,
header.dbuf.devminor);
do_chown(file);
}
else
{
string_print(NIL_PTR,
"cannot make %s special file major %s minor %s: %s\n",
(header.dbuf.typeflag == '3' ?
"character" : "block"),
header.dbuf.devmajor,
header.dbuf.devminor,
strerror(errno));
}
return;
}
case '2': /* symbolic link */
#ifdef HAVE_SYMLINK
delete(file);
if (symlink(header.member.m_link, file) < 0)
string_print(NIL_PTR, "Cannot make symbolic link %s to %s: %s\n",
header.member.m_link, file, strerror(errno));
else if (verbose_flag)
string_print(NIL_PTR, "Symbolic link %s to %s\n",
header.member.m_link, file);
return;
#endif
case '7': /* contiguous file -- what is this (KS) */
print("Not implemented file type\n");
return; /* not implemented, but break out */
#ifdef HAVE_FIFO
case '6': /* fifo */
delete(file);
if (mkfifo(file, 0) == 0) { /* is chmod'ed in do_chown */
do_chown(file);
verb_print("made fifo", file);
} else
string_print(NIL_PTR, "Can't make fifo %s: %s\n",
file, strerror(errno));
return;
#endif
}
/* Create regular file. If failure, try to make missing directories. */
if ((fd = creat(file, 0600)) < 0) {
pd1 = file;
while ((pd2 = index(pd1, '/')) > (char *) 0) {
*pd2 = '\0';
if (access(file, 1) < 0)
if (mkdir(file, 0777) < 0) {
string_print(NIL_PTR, "Cannot mkdir %s: %s\n",
file, strerror(errno));
return;
} else
string_print(NIL_PTR, "Made directory %s\n", file);
*pd2 = '/';
pd1 = ++pd2;
}
if ((fd = creat(file, 0600)) < 0) {
string_print(NIL_PTR, "Cannot create %s: %s\n",
file, strerror(errno));
return;
}
}
copy(file, tar_fd, fd, convert(header.member.m_size, LONG_TYPE));
(void) close(fd);
do_chown(file);
}
void delete(file)
char *file;
{
/* remove a file or an empty directory */
struct stat stbuf;
if (stat(file, &stbuf) < 0) return;
if (S_ISDIR(stbuf.st_mode)) (void) rmdir(file); else (void) unlink(file);
/* leave error reporting to the create following soon. */
}
void do_chown(file)
char *file;
{
int uid = -1, gid = -1; /* these are illegal ??? -- KS */
if (!chown_flag) { /* set correct owner and group -Dal */
if (header.dbuf.magic[TMAGLEN] == ' ')
header.dbuf.magic[TMAGLEN] = '\0'; /* some tars out there
* ... */
if (strncmp(TMAGIC, header.dbuf.magic, (size_t) TMAGLEN)) {
struct passwd *pwd;
struct group *grp;
pwd = getpwnam(header.dbuf.uname);
if (pwd != NULL) uid = pwd->pw_uid;
grp = getgrnam(header.dbuf.gname);
if (grp != NULL) gid = grp->gr_gid;
}
if (uid == -1) uid = (int) convert(header.member.m_uid, INT_TYPE);
if (gid == -1) gid = (int) convert(header.member.m_gid, INT_TYPE);
chown(file, uid, gid);
}
chmod(file, u_mask & (int) convert(header.member.m_mode, INT_TYPE));
/* Should there be a timestamp if the chown failes? -- KS */
timestamp(file);
}
void timestamp(file)
char *file;
{
struct utimbuf buf;
buf.modtime = buf.actime = convert(header.dbuf.mtime, LONG_TYPE);
utime(file, &buf);
}
void copy(file, from, to, bytes)
char *file;
int from, to;
register long bytes;
{
register int rest;
int blocks = (int) ((bytes + (long) TBLOCK_SIZE - 1) / (long) TBLOCK_SIZE);
if (verbose_flag)
string_print(NIL_PTR, "%s, %d tape blocks\n", file, blocks);
while (blocks--) {
(void) bread(from, io_buffer, TBLOCK_SIZE);
rest = (bytes > (long) TBLOCK_SIZE) ? TBLOCK_SIZE : (int) bytes;
mwrite(to, io_buffer, (to == tar_fd) ? TBLOCK_SIZE : rest);
bytes -= (long) rest;
}
}
long convert(str, type)
char str[];
int type;
{
register long ac = 0L;
register int i;
for (i = 0; i < type; i++) {
if (str[i] >= '0' && str[i] <= '7') {
ac <<= 3;
ac += (long) (str[i] - '0');
}
}
return ac;
}
int checksum()
{
register char *ptr = header.member.m_checksum;
register int ac = 0;
while (ptr < &header.member.m_checksum[INT_TYPE]) *ptr++ = ' ';
ptr = header.hdr_block;
while (ptr < &header.hdr_block[TBLOCK_SIZE]) ac += *ptr++;
return ac;
}
int is_dir(file)
register char *file;
{
while (*file++ != '\0');
return(*(file - 2) == '/');
}
char *path_name(file)
register char *file;
{
string_print(pathname, "%s%s", path, file);
return pathname;
}
void add_path(name)
register char *name;
{
register char *path_ptr = path;
while (*path_ptr) path_ptr++;
if (name == NIL_PTR) {
while (*path_ptr-- != '/');
while (*path_ptr != '/' && path_ptr != path) path_ptr--;
if (*path_ptr == '/') path_ptr++;
*path_ptr = '\0';
} else {
while (*name) {
if (path_ptr == &path[NAME_SIZE])
error("Pathname too long", NIL_PTR);
*path_ptr++ = *name++;
}
*path_ptr++ = '/';
*path_ptr = '\0';
}
}
/*
* add a file to the archive
*/
void add_file(file)
register char *file;
{
struct stat st;
char *linkname;
register int fd = -1;
char namebuf[16]; /* -Dal */
char cwd[129]; /* -KS */
#ifdef HAVE_SYMLINK
if (lstat(file, &st) < 0) {
#else
if (stat(file, &st) < 0) {
#endif
string_print(NIL_PTR, "%s: %s\n", file, strerror(errno));
return;
}
if (st.st_dev == ar_dev && st.st_ino == ar_inode) {
string_print(NIL_PTR, "Cannot tar current archive file (%s)\n", file);
return;
} /* marks@mgse Mon Sep 25 12:06:28 CDT 1989 */
if ((fd = add_open(file, &st)) < 0) {
string_print(NIL_PTR, "Cannot open %s\n", file);
return;
}
make_header(path_name(file), &st);
if ((linkname = is_linked(&st)) != NULL) {
strncpy(header.dbuf.linkname, linkname, (size_t) NAMSIZ);
header.dbuf.typeflag = '1';
if (verbose_flag) string_print(NIL_PTR, "linked %s to %s\n",
header.dbuf.linkname, file);
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
} else {
is_added(&st, file);
switch (st.st_mode & S_IFMT) {
case S_IFREG:
header.dbuf.typeflag = '0';
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
copy(path_name(file), fd, tar_fd, (long) st.st_size);
break;
case S_IFDIR:
header.dbuf.typeflag = '5';
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
verb_print("read directory", file);
if (norec_flag) break;
if (NULL == getcwd(cwd, (int) sizeof cwd))
string_print(NIL_PTR, "Error: cannot getcwd()\n");
else if (chdir(file) < 0)
string_print(NIL_PTR, "Cannot chdir to %s: %s\n",
file, strerror(errno));
else {
add_path(file);
#ifdef DIRECT_3
{
DIR *dirp;
struct direct *dp;
struct stat dst;
add_close(fd);
fd= 0;
dirp = opendir(".");
while (NULL != (dp = readdir(dirp)))
if (strcmp(dp->d_name, ".") == 0)
is_linked(&st);
else if (strcmp(dp->d_name, "..") == 0) {
if (stat("..", &dst) == 0)
is_linked(&dst);
} else {
strcpy(namebuf, dp->d_name);
add_file(namebuf);
}
closedir(dirp);
}
#else
{
int i;
struct direct dir;
struct stat dst;
for (i = 0; i < 2; i++) { /* . and .. */
mread(fd, &dir, sizeof(dir));
if (strcmp(dir.d_name, ".") == 0)
is_linked(&st);
else if (strcmp(dir.d_name, "..") == 0) {
if (stat("..", &dst) == 0)
is_linked(&dst);
} else
break;
}
while (bread(fd, &dir, sizeof(dir)) == sizeof(dir))
if (dir.d_ino) {
strncpy(namebuf, dir.d_name,
(size_t) DIRSIZ);
namebuf[DIRSIZ] = '\0';
add_file(namebuf);
}
}
#endif
chdir(cwd);
add_path(NIL_PTR);
*file = 0;
}
break;
#ifdef HAVE_SYMLINK
case S_IFLNK:
{
int i;
header.dbuf.typeflag = '2';
verb_print("read symlink", file);
i = readlink(file,
header.dbuf.linkname,
sizeof(header.dbuf.linkname) - 1);
if (i < 0) {
string_print(NIL_PTR,
"Cannot read symbolic link %s: %s\n",
file, strerror(errno));
return;
}
header.dbuf.linkname[i] = 0;
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
break;
}
#endif
#ifdef HAVE_FIFO
case S_IFIFO:
header.dbuf.typeflag = '6';
verb_print("read fifo", file);
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
break;
#endif
case S_IFBLK:
header.dbuf.typeflag = '4';
if (verbose_flag) {
char sizebuf[TSIZLEN + 1];
strncpy(sizebuf, header.dbuf.size, (size_t) TSIZLEN);
sizebuf[TSIZLEN] = 0;
string_print(NIL_PTR,
"read block device %s major %s minor %s\n",
file, header.dbuf.devmajor, header.dbuf.devminor, sizebuf);
}
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
break;
case S_IFCHR:
header.dbuf.typeflag = '3';
if (verbose_flag) string_print(NIL_PTR,
"read character device %s major %s minor %s\n",
file, header.dbuf.devmajor, header.dbuf.devminor);
string_print(header.member.m_checksum, "%I ", checksum());
mwrite(tar_fd, (char *) &header, sizeof(header));
break;
default:
is_deleted(&st);
string_print(NIL_PTR, "Tar: %s unknown file type. Not added.\n", file);
*file = 0;
}
}
flush();
add_close(fd);
}
void verb_print(s1, s2)
char *s1, *s2;
{
if (verbose_flag) string_print(NIL_PTR, "%s: %s\n", s1, s2);
}
void add_close(fd)
int fd;
{
if (fd != 0) close(fd);
}
/*
* open file 'file' to be added to archive, return file descriptor
*/
int add_open(file, st)
char *file;
struct stat *st;
{
int fd;
if (((st->st_mode & S_IFMT) != S_IFREG) &&
((st->st_mode & S_IFMT) != S_IFDIR))
return 0;
fd = open(file, O_RDONLY);
if (fd == -1)
fprintf(stderr, "open failed: %s\n", strerror(errno));
return fd;
}
void make_header(file, st)
char *file;
register struct stat *st;
{
register char *ptr = header.member.m_name;
struct passwd *pwd;
struct group *grp;
clear_header();
while (*ptr++ = *file++);
if ((st->st_mode & S_IFMT) == S_IFDIR) { /* fixed test -Dal */
*(ptr - 1) = '/';
}
string_print(header.member.m_mode, "%I ", st->st_mode & 07777);
string_print(header.member.m_uid, "%I ", st->st_uid);
string_print(header.member.m_gid, "%I ", st->st_gid);
if ((st->st_mode & S_IFMT) == S_IFREG)
string_print(header.member.m_size, "%L ", st->st_size);
else
strncpy(header.dbuf.size, "0", (size_t) TSIZLEN);
string_print(header.member.m_time, "%L ", st->st_mtime);
strncpy(header.dbuf.magic, TMAGIC, (size_t) TMAGLEN);
header.dbuf.version[0] = 0;
header.dbuf.version[1] = 0;
pwd = getpwuid(st->st_uid);
strncpy(header.dbuf.uname,
(pwd != NULL ? pwd->pw_name : "nobody"), TUNMLEN);
grp = getgrgid(st->st_gid);
strncpy(header.dbuf.gname,
(grp != NULL ? grp->gr_name : "nobody"), TGNMLEN);
if (st->st_mode & (S_IFBLK | S_IFCHR)) {
string_print(header.dbuf.devmajor, "%I ", (st->st_rdev >> 8));
string_print(header.dbuf.devminor, "%I ", (st->st_rdev & 0xFF));
}
header.dbuf.prefix[0] = 0;
}
void is_added(st, file)
struct stat *st;
char *file;
{
struct link *new;
char *name;
if ((*file == 0) || (st->st_nlink == 1)) return;
name = path_name(file);
new = (struct link *) malloc(sizeof(struct link) + strlen(name));
if (new == NULL) {
print("Out of memory\n");
return;
}
new->next = link_top;
new->dev = st->st_dev;
new->ino = st->st_ino;
new->nlink = st->st_nlink - 1;
strcpy(new->name, name);
link_top = new;
}
void is_deleted(st)
struct stat *st;
{
struct link *old;
if ((old = link_top) != NULL) {
link_top = old->next;
free(old);
}
}
char *is_linked(st)
struct stat *st;
{
struct link *cur = link_top;
struct link **pre = &link_top;
static char name[NAMSIZ];
while (cur != NULL)
if ((cur->dev != st->st_dev) || (cur->ino != st->st_ino)) {
pre = &cur->next;
cur = cur->next;
} else {
if (--cur->nlink == 0) {
*pre = cur->next;
strncpy(name, cur->name, NAMSIZ);
return name;
}
return cur->name;
}
return NULL;
}
void clear_header()
{
register char *ptr = header.hdr_block;
while (ptr < &header.hdr_block[TBLOCK_SIZE]) *ptr++ = '\0';
}
void adjust_boundary()
{
clear_header();
mwrite(tar_fd, (char *) &header, sizeof(header));
#ifndef POSIX_COMP
while (total_blocks++ < BLOCK_BOUNDARY)
mwrite(tar_fd, (char *) &header, sizeof(header));
#else
mwrite(tar_fd, (char *) &header, sizeof(header));
#endif
(void) close(tar_fd);
}
void mread(fd, address, bytes)
int fd, bytes;
char *address;
{
if (bread(fd, address, bytes) != bytes) error("Tar: read error.", NIL_PTR);
}
void mwrite(fd, address, bytes)
int fd, bytes;
char *address;
{
if (bwrite(fd, address, bytes) != bytes) error("Tar: write error.", NIL_PTR);
total_blocks++;
}
int bread(fd, address, bytes)
int fd, bytes;
char *address;
{
int n = 0, r;
while (n < bytes) {
if ((r = read(fd, address + n, bytes - n)) <= 0) {
if (r < 0) return r;
break;
}
n += r;
}
return n;
}
int bwrite(fd, address, bytes)
int fd, bytes;
char *address;
{
int n = 0, r;
while (n < bytes) {
if ((r = write(fd, address + n, bytes - n)) <= 0) {
if (r < 0) return r;
break;
}
n += r;
}
return n;
}
char output[TBLOCK_SIZE];
void print(str)
register char *str;
{
int fd = (tar_fd == 1 ? 2 : 1);
static int indx = 0;
if (str == NIL_PTR) {
write(fd, output, indx);
indx = 0;
return;
}
while (*str) {
output[indx++] = *str++;
if (indx == TBLOCK_SIZE) {
write(fd, output, TBLOCK_SIZE);
indx = 0;
}
}
}
char *num_out(number)
register long number;
{
static char num_buf[12];
register int i;
for (i = 11; i--;) {
num_buf[i] = (number & 07) + '0';
number >>= 3;
}
return num_buf;
}
/*VARARGS2*/
#if __STDC__
void string_print(char *buffer, char *fmt,...)
#else
void string_print(buffer, fmt)
char *buffer;
char *fmt;
#endif
{
va_list args;
register char *buf_ptr;
char *scan_ptr;
char buf[STRING_SIZE];
BOOL pr_fl, i;
if (pr_fl = (buffer == NIL_PTR)) buffer = buf;
va_start(args, fmt);
buf_ptr = buffer;
while (*fmt) {
if (*fmt == '%') {
fmt++;
switch (*fmt++) {
case 's':
scan_ptr = (char *) (va_arg(args, char *));
break;
case 'I':
scan_ptr = num_out((long) (va_arg(args, int)));
for (i = 0; i < 5; i++) scan_ptr++;
break;
case 'L':
scan_ptr = num_out((long) va_arg(args, long));
break;
case 'd':
scan_ptr = num_out((long) va_arg(args, int));
while (*scan_ptr == '0') scan_ptr++;
scan_ptr--;
break;
default: scan_ptr = "";
}
while (*buf_ptr++ = *scan_ptr++);
buf_ptr--;
} else
*buf_ptr++ = *fmt++;
}
*buf_ptr = '\0';
if (pr_fl) print(buffer);
va_end(args);
}
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