* Mini ar implementation for busybox
*
* Copyright (C) 2000 by Glenn McGrath
- * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
- *
+ * 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
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
-
-
-#include <stdio.h>
#include <fcntl.h>
-#include <errno.h>
-#include <ctype.h>
-#include "internal.h"
-
-#define AR_BLOCK_SIZE 60
-#define BB_DECLARE_EXTERN
-#define bb_need_io_error
-#include "messages.c"
-
-struct ArHeader { /* Byte Offset */
- char ar_name[16]; /* 0-15 */
- char ar_date[12]; /* 16-27 */
- char ar_uid[6], ar_gid[6]; /* 28-39 */
- char ar_mode[8]; /* 40-47 */
- char ar_size[10]; /* 48-57 */
- char ar_fmag[2]; /* 58-59 */
-};
-typedef struct ArHeader ArHeader;
-
-struct ArInfo {
- char name[17]; /* File name */
- time_t date; /* long int, No of seconds since epoch */
- uid_t uid; /* unsigned int, Numeric UID */
- gid_t gid; /* unsigned int, Numeric GID */
- mode_t mode; /* unsigned int, Unix mode */
- size_t size; /* int, Size of the file */
-};
-typedef struct ArInfo ArInfo;
-
-static const char ar_usage[] = "ar [optxvV] archive [filenames] \n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nExtract or list files from an ar archive.\n\n"
- "Options:\n"
- "\to\t\tpreserve original dates\n"
- "\tp\t\textract to stdout\n"
- "\tt\t\tlist\n"
- "\tx\t\textract\n"
- "\tv\t\tverbosely list files processed\n"
-#endif
- ;
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include "busybox.h"
-static void displayContents(struct ArInfo *entry, int funct)
-{
- /* TODO convert mode to string */
- if ((funct & 2) == 2)
- printf("%i %i/%i %6i %s ", entry->mode, entry->uid, entry->gid,
- entry->size, timeString(entry->date));
- printf("%s\n", entry->name);
-}
-
-/* Converts to new typed struct */
-static int readArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
+extern int ar_main(int argc, char **argv)
{
- int count2;
- int count;
-
- for (count = 0; count < 16; count++) {
- if (rawHeader->ar_name[count] == ' ') {
- for (count2 = count; count2 < 16; count2++)
- if (!isspace(rawHeader->ar_name[count2]))
- break;
- if (count2 >= 16)
- break;
- }
- if (rawHeader->ar_name[count] == '/')
+ FILE *src_stream = NULL;
+ char **extract_names = NULL;
+ char ar_magic[8];
+ int extract_function = extract_unconditional;
+ int opt;
+ int num_of_entries = 0;
+ extern off_t archive_offset;
+
+ while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
+ switch (opt) {
+ case 'o':
+ extract_function |= extract_preserve_date;
break;
- header->name[count] = rawHeader->ar_name[count];
- }
- header->name[count] = '\0';
- header->date = atoi(rawHeader->ar_date);
- header->uid = atoi(rawHeader->ar_uid);
- header->gid = atoi(rawHeader->ar_gid);
- header->mode = atoi(rawHeader->ar_mode);
- header->size = atoi(rawHeader->ar_size);
- return (TRUE);
-}
-
-/*
- * Copy size bytes from current position if srcFd to current position in dstFd
- * taken from tarExtractRegularFile in tar.c
- * could be used for ar, tar and copyFile .
- */
-static int copySubFile(int srcFd, int dstFd, int copySize)
-{
- int readSize, writeSize, doneSize;
- char buffer[BUFSIZ];
-
- while (copySize > 0) {
- if (copySize > BUFSIZ)
- readSize = BUFSIZ;
- else
- readSize = copySize;
- writeSize = fullRead(srcFd, buffer, readSize);
- if (writeSize <= 0) {
- errorMsg(io_error, "copySubFile :", strerror(errno));
- return (FALSE);
- }
- doneSize = fullWrite(dstFd, buffer, writeSize);
- if (doneSize <= 0) {
- errorMsg(io_error, "copySubFile :", strerror(errno));
- return (FALSE);
+ case 'v':
+ extract_function |= extract_verbose_list;
+ break;
+ case 't':
+ extract_function |= extract_list;
+ break;
+ case 'p':
+ extract_function |= extract_to_stdout;
+ break;
+ case 'x':
+ extract_function |= extract_all_to_fs;
+ break;
+ default:
+ show_usage();
}
- copySize -= doneSize;
}
- return (TRUE);
-}
-
-/*
- * Need to add checks, stat newfile before creation,change mode from 0777
- * extract to current dir
- * dstStat.st_size copied from current position of file pointed to by srcFd
- */
-static int extractToFile(int srcFd, const char *path, const char *name,
- int size)
-{
- int dstFd, temp;
- struct stat tmpStat;
- char *pathname = NULL;
-
- if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
- if (!createPath(path, 0777)) {
- fatalError("Cannot extract to specified path");
- return (FALSE);
- }
+
+ /* check the src filename was specified */
+ if (optind == argc) {
+ show_usage();
}
- temp = (strlen(path) + 16);
- pathname = (char *) xmalloc(temp);
- pathname = strcpy(pathname, path);
- pathname = strcat(pathname, &name[0]);
- dstFd = device_open(pathname, O_WRONLY | O_CREAT);
- pathname = NULL;
- temp = copySubFile(srcFd, dstFd, size);
- close(dstFd);
- return (TRUE);
-}
-/* Step through the ar file entries */
-static int readArFile(char **fileNames, int argc, int funct)
-{
- int arFd = 0;
- int pdates = 0;
- int verbose = 0;
- int display = 0;
- int extract = 0;
- int extToStdout = 0;
- int status = 0;
- int found = 0;
- ArHeader rawArHeader;
- ArInfo arEntry;
- char arVersion[8];
- char *arName;
- char *selName[argc - 2];
- int i;
+ src_stream = xfopen(argv[optind++], "r");
- if ((funct & 1) == 1)
- pdates = 1;
- if ((funct & 2) == 2)
- verbose = 1;
- if ((funct & 4) == 4)
- display = 1;
- if ((funct & 16) == 16) { /* extract to stdout */
- extract = 1;
- extToStdout = 1;
- }
- if ((funct & 8) == 8) { /* extract to file */
- extract = 1;
- }
- arName = fileNames[2];
- for (i = 0; i < (argc - 3); i++)
- selName[i] = fileNames[i + 3];
- arFd = open(arName, O_RDONLY);
- if (arFd < 0) {
- errorMsg("Error opening '%s': %s\n", arName, strerror(errno));
- return (FALSE);
- }
- if (fullRead(arFd, arVersion, 8) <= 0) {
- errorMsg("ar: Unexpected EOF in archive\n");
- return (FALSE);
+ /* check ar magic */
+ fread(ar_magic, 1, 8, src_stream);
+ archive_offset = 8;
+ if (strncmp(ar_magic,"!<arch>",7) != 0) {
+ error_msg_and_die("invalid magic");
}
- if (strncmp(arVersion, "!<arch>", 7) != 0) {
- errorMsg("ar header fails check ");
- return (FALSE);
- }
- while ((status = fullRead(arFd, (char *) &rawArHeader, AR_BLOCK_SIZE))
- == AR_BLOCK_SIZE) {
- readArHeader(&rawArHeader, &arEntry);
- if (display == 1) {
- displayContents(&arEntry, funct);
- }
- if (argc == 3)
- found = 1;
- else {
- found = 0;
- for (i = 0; i < (argc - 3); i++) {
- if ((status = (strcmp(selName[i], arEntry.name))) == 0)
- found = 1;
- }
- }
- if ((extract == 1) && (found == 1)) {
- if (extToStdout == 1) {
- copySubFile(arFd, fileno(stdout), arEntry.size);
- } else {
- extractToFile(arFd, "./", arEntry.name, arEntry.size);
- }
- } else
- lseek(arFd, arEntry.size, SEEK_CUR);
+ /* Create a list of files to extract */
+ while (optind < argc) {
+ extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
+ extract_names[num_of_entries] = xstrdup(argv[optind]);
+ num_of_entries++;
+ extract_names[num_of_entries] = NULL;
+ optind++;
}
- return (0);
-}
-
-extern int ar_main(int argc, char **argv)
-{
- int ret = 0;
- char *opt_ptr;
- char c;
- int funct = 0;
- if (argc < 2)
- usage(ar_usage);
-
- opt_ptr = argv[1];
- if (*opt_ptr == '-')
- ++opt_ptr;
- while ((c = *opt_ptr++) != '\0') {
- switch (c) {
- case 'o': /* preserver original dates */
- funct = funct | 1;
- break;
- case 'p': /* extract to stdout */
- funct = funct | 16;
- break;
- case 't': /* display contents */
- funct = funct | 4;
- break;
- case 'x': /* extract contents of archive */
- funct = funct | 8;
- break;
- case 'v': /* be verbose */
- funct = funct | 2;
- break;
- default:
- usage(ar_usage);
- }
- }
- if (funct > 3)
- ret = readArFile(argv, argc, funct);
- return (ret);
+ unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff