ar: heh, there *was* "-1" already...
[oweals/busybox.git] / archival / ar.c
index d666719006ec359bf043e8f4a38cda84654be7d3..fd7f8e4dba28c0d23410e49ea5fe98bc7cec8b79 100644 (file)
 /* vi: set sw=4 ts=4: */
 /*
- * Mini ar implementation for busybox 
+ * Mini ar implementation for busybox
  *
  * Copyright (C) 2000 by Glenn McGrath
- * Written by Glenn McGrath <bug1@optushome.com.au> 1 June 2000
- *             
- * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
- *
- * This program 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 2 of the License, or
- * (at your option) any later version.
  *
- * This program 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.
+ * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  *
+ * There is no single standard to adhere to so ar may not portable
+ * between different systems
+ * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
  */
-#include <fcntl.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <unistd.h>
-#include "busybox.h"
 
-typedef struct ar_headers_s {
-       char *name;
-       off_t size;
-       uid_t uid;
-       gid_t gid;
-       mode_t mode;
-       time_t mtime;
-       off_t offset;
-       struct ar_headers_s *next;
-} ar_headers_t;
+#include "libbb.h"
+#include "unarchive.h"
 
-/*
- * return the headerL_t struct for the filename descriptor
- */
-extern ar_headers_t get_ar_headers(int srcFd)
+static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
 {
-       typedef struct raw_ar_header_s {        /* Byte Offset */
-               char name[16];  /*  0-15 */
-               char date[12];  /* 16-27 */
-               char uid[6];    
-               char gid[6];    /* 28-39 */
-               char mode[8];   /* 40-47 */
-               char size[10];  /* 48-57 */
-               char fmag[2];   /* 58-59 */
-       } raw_ar_header_t;
-
-       raw_ar_header_t raw_ar_header;
-
-       ar_headers_t *head, *entry;
-       char ar_magic[8];
-       char *long_name=NULL;
-       
-       head = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
-       entry = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
-       
-       /* check ar magic */
-       if (full_read(srcFd, ar_magic, 8) != 8) {
-               error_msg_and_die("cannot read magic");
-       }
-
-       if (strncmp(ar_magic,"!<arch>",7) != 0) {
-               error_msg_and_die("invalid magic");
-       }
-
-       while (full_read(srcFd, (char *) &raw_ar_header, 60)==60) {
-               /* check the end of header markers are valid */
-               if ((raw_ar_header.fmag[0]!='`') || (raw_ar_header.fmag[1]!='\n')) {
-                       char newline;
-                       if (raw_ar_header.fmag[1]!='`') {
-                               break;
-                       }
-                       /* some version of ar, have an extra '\n' after each entry */
-                       read(srcFd, &newline, 1);
-                       if (newline!='\n') {
-                               break;
-                       }
-                       /* fix up the header, we started reading 1 byte too early due to a '\n' */
-                       memmove((char *) &raw_ar_header, (char *)&raw_ar_header+1, 59);
-                       /* dont worry about adding the last '\n', we dont need it now */
-               }
-               
-               entry->size = (off_t) atoi(raw_ar_header.size);
-               /* long filenames have '/' as the first character */
-               if (raw_ar_header.name[0] == '/') {
-                       if (raw_ar_header.name[1] == '/') {
-                               /* multiple long filenames are stored as data in one entry */
-                               long_name = (char *) xrealloc(long_name, entry->size);
-                               full_read(srcFd, long_name, entry->size);
-                               continue;
-                       }
-                       else {
-                               /* The number after the '/' indicates the offset in the ar data section
-                                       (saved in variable long_name) that conatains the real filename */
-                               const int long_name_offset = (int) atoi((char *) &raw_ar_header.name[1]);
-                               entry->name = xmalloc(strlen(&long_name[long_name_offset]));
-                               strcpy(entry->name, &long_name[long_name_offset]);
-                       }
-               }
-               else {
-                       /* short filenames */
-                       entry->name = xmalloc(16);
-                       strncpy(entry->name, raw_ar_header.name, 16);
-               }
-               entry->name[strcspn(entry->name, " /")]='\0';
-
-               /* convert the rest of the now valid char header to its typed struct */ 
-               parse_mode(raw_ar_header.mode, &entry->mode);
-               entry->mtime = atoi(raw_ar_header.date);
-               entry->uid = atoi(raw_ar_header.uid);
-               entry->gid = atoi(raw_ar_header.gid);
-               entry->offset = lseek(srcFd, 0, SEEK_CUR);
-
-               /* add this entries header to our combined list */
-               entry->next = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
-               *entry->next = *head;
-               *head = *entry;
-               lseek(srcFd, (off_t) entry->size, SEEK_CUR);
-       }
-       return(*head);
+       const char *mode = bb_mode_string(file_header->mode);
+       char *mtime;
+
+       mtime = ctime(&file_header->mtime);
+       mtime[16] = ' ';
+       memmove(&mtime[17], &mtime[20], 4);
+       mtime[21] = '\0';
+       printf("%s %d/%d%7d %s %s\n", &mode[1], file_header->uid, file_header->gid,
+                       (int) file_header->size, &mtime[4], file_header->name);
 }
 
-extern int ar_main(int argc, char **argv)
+#define AR_CTX_PRINT           0x01
+#define AR_CTX_LIST            0x02
+#define AR_CTX_EXTRACT         0x04
+#define AR_OPT_PRESERVE_DATE   0x08
+#define AR_OPT_VERBOSE         0x10
+#define AR_OPT_CREATE          0x20
+#define AR_OPT_INSERT          0x40
+
+int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ar_main(int argc UNUSED_PARAM, char **argv)
 {
-       const int preserve_date = 1;    /* preserve original dates */
-       const int verbose = 2;          /* be verbose */
-       const int display = 4;          /* display contents */
-       const int extract_to_file = 8;  /* extract contents of archive */
-       const int extract_to_stdout = 16;       /* extract to stdout */
+       static const char msg_unsupported_err[] ALIGN1 =
+               "archive %s is not supported";
 
-       int funct = 0, opt=0;
-       int srcFd=0, dstFd=0;
+       archive_handle_t *archive_handle;
+       unsigned opt;
 
-       ar_headers_t head, *extract_list=NULL;
+       archive_handle = init_handle();
 
-       extract_list = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+       /* Prepend '-' to the first argument if required */
+       opt_complementary = "--:p:t:x:-1:p--tx:t--px:x--pt";
+       opt = getopt32(argv, "ptxovcr");
+       argv += optind;
 
-       while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
-               switch (opt) {
-               case 'o':
-                       funct |= preserve_date;
-                       break;
-               case 'v':
-                       funct |= verbose;
-                       break;
-               case 't':
-                       funct |= display;
-                       break;
-               case 'p':
-                       funct |= extract_to_stdout;
-                       break;
-               case 'x':
-                       funct |= extract_to_file;
-                       break;
-               default:
-                       show_usage();
-               }
+       if (opt & AR_CTX_PRINT) {
+               archive_handle->action_data = data_extract_to_stdout;
+       }
+       if (opt & AR_CTX_LIST) {
+               archive_handle->action_header = header_list;
+       }
+       if (opt & AR_CTX_EXTRACT) {
+               archive_handle->action_data = data_extract_all;
+       }
+       if (opt & AR_OPT_PRESERVE_DATE) {
+               archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
+       }
+       if (opt & AR_OPT_VERBOSE) {
+               archive_handle->action_header = header_verbose_list_ar;
+       }
+       if (opt & AR_OPT_CREATE) {
+               bb_error_msg_and_die(msg_unsupported_err, "creation");
+       }
+       if (opt & AR_OPT_INSERT) {
+               bb_error_msg_and_die(msg_unsupported_err, "insertion");
        }
-       /* check the src filename was specified */
-       if (optind == argc)
-               show_usage();
-       
-       if ( (srcFd = open(argv[optind], O_RDONLY)) < 0)
-               error_msg_and_die("Cannot read %s", argv[optind]);
 
-       optind++;       
-       head = get_ar_headers(srcFd);
+       archive_handle->src_fd = xopen(*argv++, O_RDONLY);
 
-       /* find files to extract or display */
-       /* search through argv and build extract list */
-       for (;optind<argc; optind++) {
-               ar_headers_t *ar_entry;
-               ar_entry = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
-               ar_entry = &head;
-               while (ar_entry->next != NULL) {
-                       if (strcmp(argv[optind], ar_entry->name) == 0) {
-                               ar_headers_t *tmp;
-                               tmp = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
-                               *tmp = *extract_list;
-                               *extract_list = *ar_entry;
-                               extract_list->next = tmp;
-                               break;                                  
-                       }
-                       ar_entry=ar_entry->next;
-               }
+       while (*argv) {
+               archive_handle->filter = filter_accept_list;
+               llist_add_to(&archive_handle->accept, *argv++);
        }
 
-       /* if individual files not found extract all files */   
-       if (extract_list->next==NULL) {
-               extract_list = &head;
-       }
-       
-       /* find files to extract or display */  
-       while (extract_list->next != NULL) {
-               if (funct & extract_to_file) {
-                       dstFd = open(extract_list->name, O_WRONLY | O_CREAT, extract_list->mode);                               
-               }
-               else if (funct & extract_to_stdout) {
-                       dstFd = fileno(stdout);
-               }
-               if ((funct & extract_to_file) || (funct & extract_to_stdout)) {
-                       lseek(srcFd, extract_list->offset, SEEK_SET);
-                       copy_file_chunk(srcFd, dstFd, (off_t) extract_list->size);                      
-               }
-               if (funct & verbose) {
-                       printf("%s %d/%d %8d %s ", mode_string(extract_list->mode), 
-                               extract_list->uid, extract_list->gid,
-                               extract_list->size, time_string(extract_list->mtime));
-               }
-               if ((funct & display) || (funct & verbose)){
-                       printf("%s\n", extract_list->name);
-               }
-               extract_list=extract_list->next;
-       }
+       unpack_ar_archive(archive_handle);
+
        return EXIT_SUCCESS;
 }