Adding tar.
This commit is contained in:
David Galos
parent
9ac01f59be
commit
2c75eb98d9
1
Makefile
1
Makefile
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@ -69,6 +69,7 @@ SRC = \
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sponge.c \
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sync.c \
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tail.c \
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tar.c \
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tee.c \
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test.c \
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touch.c \
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62
tar.1
Normal file
62
tar.1
Normal file
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@ -0,0 +1,62 @@
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.TH TAR 1 sbase\-VERSION
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.SH NAME
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tar \- create, list or extract a tape archive
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.SH SYNOPSIS
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.B tar
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.RB [ \-f
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.IR tarfile]
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.RB [ \-C
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.IR dir ]
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.RB [ - ] x | t
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.B tar
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.RB [ \-f
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.IR tarfile]
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.RB [ \-C
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.IR dir ]
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.RB [ - ] c
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.I dir
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.B tar
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.RB [ \-C
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.IR dir ]
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.B cf
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.I tarfile
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.I dir
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.B tar
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.RB [ \-C
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.IR dir ]
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.B x|tf
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.I tarfile
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.SH DESCRIPTION
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.B tar
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is the standard file archiver. Generally the archives
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created with it are further compressed.
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.SH OPTIONS
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.TP
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.B x
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extract tarball from stdin
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.TP
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.B t
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list all files in tarball from stdin
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.TP
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.BI c\ path
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creates tarball from
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.I path
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and prints it to stdout
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.TP
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.BI f\ tarfile
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Make
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.I tarfile
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be the archive, rather than stdin or stdout.
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.TP
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.BI C\ dir
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Change dierctory to
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.I dir
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before beginning.
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.SH SEE ALSO
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.IR ar (1)
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.IR gzip (1)
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.IR bzip2 (1)
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298
tar.c
Normal file
298
tar.c
Normal file
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@ -0,0 +1,298 @@
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/* See LICENSE file for copyright and license details. */
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <ftw.h>
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#include <grp.h>
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#include <pwd.h>
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#include "util.h"
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typedef struct Header Header;
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struct Header {
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char name[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char type;
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char link[100];
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char magic[6];
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char version[2];
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char uname[32];
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char gname[32];
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char major[8];
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char minor[8];
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};
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enum {
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Blksiz = 512
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};
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enum Type {
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REG = '0', HARDLINK = '1', SYMLINK = '2', CHARDEV = '3',
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BLOCKDEV = '4', DIRECTORY = '5', FIFO = '6'
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};
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static void putoctal(char *, unsigned, int);
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static int strlcpy(char *, const char *, int n);
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static int archive(const char *, const struct stat *, int);
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static int unarchive(char *, int, char[Blksiz]);
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static int print(char *, int , char[Blksiz]);
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static void c(char *);
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static void xt(int (*)(char*, int, char[Blksiz]));
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static FILE *tarfile;
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static void
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usage(void)
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{
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eprintf("usage: tar [-f tarfile] [-C dir] [-]x|t\n"
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" tar [-f tarfile] [-C dir] [-]c dir\n"
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" tar [-C dir] cf tarfile dir\n"
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" tar [-C dir] x|tf tarfile\n");
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}
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int
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main(int argc, char *argv[])
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{
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char *file, *dir, *ap;
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char mode = '\0';
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ARGBEGIN {
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case 'x':
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case 'c':
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case 't':
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if(mode)
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usage();
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mode = ARGC();
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break;
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case 'C':
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dir = EARGF(usage());
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break;
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case 'f':
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file = EARGF(usage());
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break;
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default:
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usage();
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} ARGEND;
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if(!mode) {
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if(argc < 1)
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usage();
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for(ap = argv[0]; *ap; ap++) {
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switch(*ap) {
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case 'x':
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case 'c':
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case 't':
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if(mode)
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usage();
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mode = *ap;
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break;
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case 'f':
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if(argc < 2)
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usage();
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argc--, argv++;
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file = argv[0];
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break;
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case 'C':
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if(argc < 2)
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usage();
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argc--, argv++;
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dir = argv[0];
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break;
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default:
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usage();
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}
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}
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argc--, argv++;
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}
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if(!mode || argc != (mode == 'c'))
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usage();
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if(file) {
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tarfile = fopen(file, (mode == 'c') ? "wb" : "rb");
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if(!tarfile)
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eprintf("tar: open '%s':", file);
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} else {
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tarfile = (mode == 'c') ? stdout : stdin;
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}
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if(dir)
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chdir(dir);
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if(mode == 'c') {
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c(argv[0]);
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} else {
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xt((mode == 'x') ? unarchive : print);
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}
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return 0;
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}
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void
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putoctal(char *dst, unsigned num, int n)
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{
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snprintf(dst, n, "%.*o", n-1, num);
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}
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int
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strlcpy(char *dst, const char *src, int n)
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{
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return snprintf(dst, n, "%s", src);
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}
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int
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archive(const char* path, const struct stat* sta, int type)
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{
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unsigned char b[Blksiz];
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unsigned chksum;
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int l, x;
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Header *h = (void*)b;
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FILE *f = NULL;
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struct stat st;
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struct passwd *pw;
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struct group *gr;
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mode_t mode;
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lstat(path, &st);
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pw = getpwuid(st.st_uid);
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gr = getgrgid(st.st_gid);
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memset(b, 0, sizeof b);
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strlcpy (h->name, path, sizeof h->name);
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putoctal(h->mode, (unsigned)st.st_mode&0777, sizeof h->mode);
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putoctal(h->uid, (unsigned)st.st_uid, sizeof h->uid);
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putoctal(h->gid, (unsigned)st.st_gid, sizeof h->gid);
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putoctal(h->size, 0, sizeof h->size);
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putoctal(h->mtime, (unsigned)st.st_mtime, sizeof h->mtime);
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memcpy(h->magic, "ustar", sizeof h->magic);
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memcpy(h->version, "00", sizeof h->version);
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strlcpy(h->uname, pw->pw_name, sizeof h->uname);
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strlcpy(h->gname, gr->gr_name, sizeof h->gname);
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mode = st.st_mode;
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if(S_ISREG(mode)) {
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h->type = REG;
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putoctal(h->size, (unsigned)st.st_size, sizeof h->size);
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f = fopen(path, "r");
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} else if(S_ISDIR(mode)) {
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h->type = DIRECTORY;
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} else if(S_ISLNK(mode)) {
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h->type = SYMLINK;
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readlink(path, h->link, (sizeof h->link)-1);
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} else if(S_ISCHR(mode) || S_ISBLK(mode)) {
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h->type = S_ISCHR(mode) ? CHARDEV : BLOCKDEV;
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putoctal(h->major, (unsigned)major(st.st_dev), sizeof h->major);
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putoctal(h->minor, (unsigned)minor(st.st_dev), sizeof h->minor);
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} else if(S_ISFIFO(mode)) {
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h->type = FIFO;
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}
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memset(h->chksum, ' ', sizeof h->chksum);
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for(x = 0, chksum = 0; x < sizeof *h; x++)
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chksum += b[x];
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putoctal(h->chksum, chksum, sizeof h->chksum);
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fwrite(b, Blksiz, 1, tarfile);
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if(!f)
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return 0;
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while((l = fread(b, 1, Blksiz, f)) > 0) {
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if(l < Blksiz)
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memset(b+l, 0, Blksiz-l);
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fwrite(b, Blksiz, 1, tarfile);
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}
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fclose(f);
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return 0;
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}
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int
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unarchive(char *fname, int l, char b[Blksiz])
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{
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char lname[101];
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FILE *f = NULL;
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unsigned long mode, major, minor, type;
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Header *h = (void*)b;
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unlink(fname);
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switch(h->type) {
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case REG:
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mode = strtoul(h->mode, 0, 8);
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if(!(f = fopen(fname, "w")) || chmod(fname, mode))
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perror(fname);
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break;
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case HARDLINK:
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case SYMLINK:
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strlcpy(lname, h->link, sizeof lname);
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if(!((h->type == HARDLINK) ? link : symlink)(lname, fname))
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perror(fname);
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break;
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case DIRECTORY:
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mode = strtoul(h->mode, 0, 8);
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if(mkdir(fname, (mode_t)mode))
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perror(fname);
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break;
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case CHARDEV:
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case BLOCKDEV:
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mode = strtoul(h->mode, 0, 8);
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major = strtoul(h->major, 0, 8);
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minor = strtoul(h->mode, 0, 8);
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type = (h->type == CHARDEV) ? S_IFCHR : S_IFBLK;
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if(mknod(fname, type | mode, makedev(major, minor)))
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perror(fname);
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break;
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case FIFO:
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mode = strtoul(h->mode, 0, 8);
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if(mknod(fname, S_IFIFO | mode, 0))
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perror(fname);
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break;
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default:
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fprintf(stderr, "usupported tarfiletype %c\n", h->type);
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}
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if(getuid() == 0 && chown(fname, strtoul(h->uid, 0, 8),
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strtoul(h->gid, 0, 8)))
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perror(fname);
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for(; l > 0; l -= Blksiz) {
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fread(b, Blksiz, 1, tarfile);
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if(f)
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fwrite(b, MIN(l, 512), 1, f);
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}
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if(f)
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fclose(f);
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return 0;
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}
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int
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print(char * fname, int l, char b[Blksiz])
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{
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puts(fname);
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for(; l > 0; l -= Blksiz)
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fread(b, Blksiz, 1, tarfile);
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return 0;
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}
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void
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c(char * dir)
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{
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ftw(dir, archive, FOPEN_MAX);
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}
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void
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xt(int (*fn)(char*, int, char[Blksiz]))
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{
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char b[Blksiz], fname[101];
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Header *h = (void*)b;
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while(fread(b, Blksiz, 1, tarfile) && h->name[0] != '\0') {
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strlcpy(fname, h->name, sizeof fname);
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fn(fname, strtol(h->size, 0, 8), b);
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}
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}
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