X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=tar.c;h=9b3cb7d8142e2a226513a9f48c8dd82e48d1cf00;hb=0a64de9b4f7b3254008affe21b3ad4174c26f7f5;hp=37a28a3d020a531eb04bda330328af519a599598;hpb=6acaa40f27de0da935c3063b6be2ead9eeee5d0b;p=oweals%2Fbusybox.git

diff --git a/tar.c b/tar.c
index 37a28a3d0..9b3cb7d81 100644
--- a/tar.c
+++ b/tar.c
@@ -1,12 +1,12 @@
 /* vi: set sw=4 ts=4: */
 /*
+ * Mini tar implementation for busybox 
  *
- * Mini tar implementation for busybox Note, that as of BusyBox 0.43 tar has
- * been completely rewritten from the ground up.  It still has remnents of the
- * old code lying about, but it pretty different (i.e. cleaner, less global
- * variables, etc)
+ * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
+ * ground up.  It still has remnents of the old code lying about, but it is
+ * very different now (i.e. cleaner, less global variables, etc)
  *
- * Copyright (C) 1999 by Lineo, inc.
+ * Copyright (C) 2000 by Lineo, inc.
  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
  *
  * Based in part in the tar implementation in sash
@@ -15,7 +15,7 @@
  *  provided that this copyright notice remains intact.
  *  Permission to distribute sash derived code under the GPL has been granted.
  *
- * Based in part on the tar implementation in busybox-0.28
+ * Based in part on the tar implementation from busybox-0.28
  *  Copyright (C) 1995 Bruce Perens
  *  This is free software under the GNU General Public License.
  *
@@ -52,29 +52,33 @@
 #include <sys/param.h>			/* for PATH_MAX */
 
 
-#ifdef BB_FEATURE_TAR_CREATE
-
 static const char tar_usage[] =
-	"tar -[cxtvOf] [tarFileName] [FILE] ...\n\n"
-	"Create, extract, or list files from a tar file.\n\n"
-	"Options:\n"
-
-	"\tc=create, x=extract, t=list contents, v=verbose,\n"
-	"\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
-
+#ifdef BB_FEATURE_TAR_CREATE
+	"tar -[cxtvO] "
 #else
-
-static const char tar_usage[] =
-	"tar -[xtvOf] [tarFileName] [FILE] ...\n\n"
-	"Extract, or list files stored in a tar file.  This\n"
-	"version of tar does not support creation of tar files.\n\n"
-	"Options:\n"
-
-	"\tx=extract, t=list contents, v=verbose,\n"
-	"\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
-
+	"tar -[xtvO] "
 #endif
-
+#if defined BB_FEATURE_TAR_EXCLUDE
+	"[--exclude File] "
+#endif
+	"[-f tarFile] [FILE] ...\n\n"
+	"Create, extract, or list files from a tar file.  Note that\n"
+	"this version of tar treats hard links as separate files.\n\n"
+	"Main operation mode:\n"
+#ifdef BB_FEATURE_TAR_CREATE
+	"\tc\t\tcreate\n"
+#endif
+	"\tx\t\textract\n"
+	"\tt\t\tlist\n"
+	"File selection:\n"
+	"\tf\t\tname of tarfile or \"-\" for stdin\n"
+	"\tO\t\textract to stdout\n"
+#if defined BB_FEATURE_TAR_EXCLUDE
+	"\t--exclude\tfile to exclude\n"
+#endif
+	"Informative output:\n"
+	"\tv\t\tverbosely list files processed\n"
+	;
 
 /* Tar file constants  */
 #ifndef MAJOR
@@ -87,33 +91,32 @@ static const char tar_usage[] =
 struct TarHeader
 {
                                 /* byte offset */
-	char name[100];               /*   0 */
-	char mode[8];                 /* 100 */
-	char uid[8];                  /* 108 */
-	char gid[8];                  /* 116 */
-	char size[12];                /* 124 */
-	char mtime[12];               /* 136 */
-	char chksum[8];               /* 148 */
-	char typeflag;                /* 156 */
-	char linkname[100];           /* 157 */
-	char magic[6];                /* 257 */
-	char version[2];              /* 263 */
-	char uname[32];               /* 265 */
-	char gname[32];               /* 297 */
-	char devmajor[8];             /* 329 */
-	char devminor[8];             /* 337 */
-	char prefix[155];             /* 345 */
-	/* padding                       500 */
+	char name[100];               /*   0-99 */
+	char mode[8];                 /* 100-107 */
+	char uid[8];                  /* 108-115 */
+	char gid[8];                  /* 116-123 */
+	char size[12];                /* 124-135 */
+	char mtime[12];               /* 136-147 */
+	char chksum[8];               /* 148-155 */
+	char typeflag;                /* 156-156 */
+	char linkname[100];           /* 157-256 */
+	char magic[6];                /* 257-262 */
+	char version[2];              /* 263-264 */
+	char uname[32];               /* 265-296 */
+	char gname[32];               /* 297-328 */
+	char devmajor[8];             /* 329-336 */
+	char devminor[8];             /* 337-344 */
+	char prefix[155];             /* 345-499 */
+	char padding[12];             /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
 };
 typedef struct TarHeader TarHeader;
 
 
 /* A few useful constants */
 #define TAR_MAGIC          "ustar"        /* ustar and a null */
-#define TAR_VERSION        "00"           /* 00 and no null */
+#define TAR_VERSION        "  "           /* Be compatable with GNU tar format */
 #define TAR_MAGIC_LEN       6
 #define TAR_VERSION_LEN     2
-#define TAR_NAME_LEN        100
 #define TAR_BLOCK_SIZE      512
 
 /* A nice enum with all the possible tar file content types */
@@ -150,93 +153,105 @@ struct TarInfo
 };
 typedef struct TarInfo TarInfo;
 
-/* Static data  */
-static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
-
-
 /* Local procedures to restore files from a tar file.  */
 static int readTarFile(const char* tarName, int extractFlag, int listFlag, 
-		int tostdoutFlag, int verboseFlag);
+		int tostdoutFlag, int verboseFlag, char** excludeList);
 
 
 
 #ifdef BB_FEATURE_TAR_CREATE
 /* Local procedures to save files into a tar file.  */
-static int writeTarFile(const char* tarName, int extractFlag, int listFlag, 
-		int tostdoutFlag, int verboseFlag, int argc, char **argv);
-static int putOctal(char *cp, int len, long value);
-
+static int writeTarFile(const char* tarName, int tostdoutFlag, 
+		int verboseFlag, int argc, char **argv, char** excludeList);
 #endif
 
 
 extern int tar_main(int argc, char **argv)
 {
+	char** excludeList=NULL;
+#if defined BB_FEATURE_TAR_EXCLUDE
+	int excludeListSize=0;
+#endif
 	const char *tarName=NULL;
-	const char *options;
 	int listFlag     = FALSE;
 	int extractFlag  = FALSE;
 	int createFlag   = FALSE;
 	int verboseFlag  = FALSE;
 	int tostdoutFlag = FALSE;
+	int stopIt;
 
-	argc--;
-	argv++;
-
-	if (argc < 1)
+	if (argc <= 1)
 		usage(tar_usage);
 
-	/* Parse options  */
-	if (**argv == '-')
-		options = (*argv++) + 1;
-	else
-		options = (*argv++);
-	argc--;
-
-	for (; *options; options++) {
-		switch (*options) {
-		case 'f':
-			if (tarName != NULL)
-				fatalError( "Only one 'f' option allowed\n");
-
-			tarName = *argv++;
-			if (tarName == NULL)
-				fatalError( "Option requires an argument: No file specified\n");
-			argc--;
-
-			break;
-
-		case 't':
-			if (extractFlag == TRUE || createFlag == TRUE)
-				goto flagError;
-			listFlag = TRUE;
-			break;
-
-		case 'x':
-			if (listFlag == TRUE || createFlag == TRUE)
-				goto flagError;
-			extractFlag = TRUE;
-			break;
-		case 'c':
-			if (extractFlag == TRUE || listFlag == TRUE)
-				goto flagError;
-			createFlag = TRUE;
-			break;
-
-		case 'v':
-			verboseFlag = TRUE;
-			break;
-
-		case 'O':
-			tostdoutFlag = TRUE;
-			break;
-
-		case '-':
-			usage(tar_usage);
-			break;
-
-		default:
-			fatalError( "Unknown tar flag '%c'\n" 
-					"Try `tar --help' for more information\n", *options);
+	/* Parse any options */
+	while (--argc > 0 && **(++argv) == '-') {
+		stopIt=FALSE;
+		while (stopIt==FALSE && *(++(*argv))) {
+			switch (**argv) {
+				case 'f':
+					if (--argc == 0) {
+						fatalError( "Option requires an argument: No file specified\n");
+					}
+					if (tarName != NULL)
+						fatalError( "Only one 'f' option allowed\n");
+					tarName = *(++argv);
+					if (tarName == NULL)
+						fatalError( "Option requires an argument: No file specified\n");
+					stopIt=TRUE;
+					break;
+
+				case 't':
+					if (extractFlag == TRUE || createFlag == TRUE)
+						goto flagError;
+					listFlag = TRUE;
+					break;
+
+				case 'x':
+					if (listFlag == TRUE || createFlag == TRUE)
+						goto flagError;
+					extractFlag = TRUE;
+					break;
+				case 'c':
+					if (extractFlag == TRUE || listFlag == TRUE)
+						goto flagError;
+					createFlag = TRUE;
+					break;
+
+				case 'v':
+					verboseFlag = TRUE;
+					break;
+
+				case 'O':
+					tostdoutFlag = TRUE;
+					tarName = "-";
+					break;
+				case '-':
+#if defined BB_FEATURE_TAR_EXCLUDE
+					if (strcmp(*argv, "-exclude")==0) {
+						if (--argc == 0) {
+							fatalError( "Option requires an argument: No file specified\n");
+						}
+						excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
+						excludeList[excludeListSize] = *(++argv);
+						/* Remove leading "/"s */
+						if (*excludeList[excludeListSize] =='/') {
+							excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
+						}
+						if (excludeList[excludeListSize++] == NULL)
+							fatalError( "Option requires an argument: No file specified\n");
+						/* Tack a NULL onto the end of the list */
+						excludeList[excludeListSize] = NULL;
+						stopIt=TRUE;
+						break;
+					}
+#endif
+					usage(tar_usage);
+					break;
+
+				default:
+					fatalError( "Unknown tar flag '%c'\n" 
+							"Try `tar --help' for more information\n", **argv);
+			}
 		}
 	}
 
@@ -248,10 +263,10 @@ extern int tar_main(int argc, char **argv)
 #ifndef BB_FEATURE_TAR_CREATE
 		fatalError( "This version of tar was not compiled with tar creation support.\n");
 #else
-		exit(writeTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, argc, argv));
+		exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
 #endif
 	} else {
-		exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
+		exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
 	}
 
   flagError:
@@ -259,6 +274,19 @@ extern int tar_main(int argc, char **argv)
 }
 					
 static void
+fixUpPermissions(TarInfo *header)
+{
+	struct utimbuf t;
+	/* Now set permissions etc for the new file */
+	chown(header->name, header->uid, header->gid);
+	chmod(header->name, header->mode);
+	/* Reset the time */
+	t.actime = time(0);
+	t.modtime = header->mtime;
+	utime(header->name, &t);
+}
+				
+static int
 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
 {
 	size_t  writeSize;
@@ -293,7 +321,7 @@ tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
 		if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
 			/* Tarball seems to have a problem */
 			errorMsg("tar: Unexpected EOF in archive\n"); 
-			return;
+			return( FALSE);
 		}
 		if ( readSize < writeSize )
 			writeSize = readSize;
@@ -304,8 +332,10 @@ tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
 			if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
 				/* Output file seems to have a problem */
 				errorMsg(io_error, header->name, strerror(errno)); 
-				return;
+				return( FALSE);
 			}
+		} else {
+			actualWriteSz=writeSize;
 		}
 
 		size -= actualWriteSz;
@@ -314,41 +344,23 @@ tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
 	/* Now we are done writing the file out, so try 
 	 * and fix up the permissions and whatnot */
 	if (extractFlag==TRUE && tostdoutFlag==FALSE) {
-		struct utimbuf t;
-		/* Now set permissions etc for the new file */
-		fchown(outFd, header->uid, header->gid);
-		fchmod(outFd, header->mode & ~S_IFMT);
 		close(outFd);
-		/* File must be closed before trying to change the date */
-		t.actime = time(0);
-		t.modtime = header->mtime;
-		utime(header->name, &t);
+		fixUpPermissions(header);
 	}
+	return( TRUE);
 }
 
-static void
-fixUpPermissions(TarInfo *header)
-{
-	struct utimbuf t;
-	/* Now set permissions etc for the new file */
-	chown(header->name, header->uid, header->gid);
-	chmod(header->name, header->mode);
-	/* Reset the time */
-	t.actime = time(0);
-	t.modtime = header->mtime;
-	utime(header->name, &t);
-}
-				
-static void
+static int
 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
 {
 
 	if (extractFlag==FALSE || tostdoutFlag==TRUE)
-		return;
+		return( TRUE);
 
 	if (createPath(header->name, header->mode) != TRUE) {
-		errorMsg("Error creating directory '%s': %s", header->name, strerror(errno)); 
-		return;  
+		errorMsg("tar: %s: Cannot mkdir: %s\n", 
+				header->name, strerror(errno)); 
+		return( FALSE);
 	}
 	/* make the final component, just in case it was
 	 * omitted by createPath() (which will skip the
@@ -356,33 +368,37 @@ tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
 	if (mkdir(header->name, header->mode) == 0) {
 		fixUpPermissions(header);
 	}
+	return( TRUE);
 }
 
-static void
+static int
 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
 {
 	if (extractFlag==FALSE || tostdoutFlag==TRUE)
-		return;
+		return( TRUE);
 
 	if (link(header->linkname, header->name) < 0) {
-		errorMsg("Error creating hard link '%s': %s\n", header->linkname, strerror(errno)); 
-		return;
+		errorMsg("tar: %s: Cannot create hard link to '%s': %s\n", 
+				header->name, header->linkname, strerror(errno)); 
+		return( FALSE);
 	}
 
 	/* Now set permissions etc for the new directory */
 	fixUpPermissions(header);
+	return( TRUE);
 }
 
-static void
+static int
 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
 {
 	if (extractFlag==FALSE || tostdoutFlag==TRUE)
-		return;
+		return( TRUE);
 
 #ifdef	S_ISLNK
 	if (symlink(header->linkname, header->name) < 0) {
-		errorMsg("Error creating symlink '%s': %s\n", header->linkname, strerror(errno)); 
-		return;
+		errorMsg("tar: %s: Cannot create symlink to '%s': %s\n", 
+				header->name, header->linkname, strerror(errno)); 
+		return( FALSE);
 	}
 	/* Try to change ownership of the symlink.
 	 * If libs doesn't support that, don't bother.
@@ -395,26 +411,36 @@ tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
 	/* Do not change permissions or date on symlink,
 	 * since it changes the pointed to file instead.  duh. */
 #else
-	fprintf(stderr, "Cannot create symbolic links\n");
+	errorMsg("tar: %s: Cannot create symlink to '%s': %s\n", 
+			header->name, header->linkname, 
+			"symlinks not supported"); 
 #endif
+	return( TRUE);
 }
 
-static void
+static int
 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
 {
 	if (extractFlag==FALSE || tostdoutFlag==TRUE)
-		return;
+		return( TRUE);
 
 	if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
-		mknod(header->name, header->mode, makedev(header->devmajor, header->devminor));
+		if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
+			errorMsg("tar: %s: Cannot mknod: %s\n",
+				header->name, strerror(errno)); 
+			return( FALSE);
+		}
 	} else if (S_ISFIFO(header->mode)) {
-		mkfifo(header->name, header->mode);
-	} else {
-		open(header->name, O_WRONLY | O_CREAT | O_TRUNC, header->mode);
+		if (mkfifo(header->name, header->mode) < 0) {
+			errorMsg("tar: %s: Cannot mkfifo: %s\n",
+				header->name, strerror(errno)); 
+			return( FALSE);
+		}
 	}
 
 	/* Now set permissions etc for the new directory */
 	fixUpPermissions(header);
+	return( TRUE);
 }
 
 /* Read an octal value in a field of the specified width, with optional
@@ -439,13 +465,26 @@ static long getOctal(const char *cp, int size)
 
 /* Parse the tar header and fill in the nice struct with the details */
 static int
-parseTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
+readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
 {
 	int i;
-	long chksum, sum;
+	long chksum, sum=0;
 	unsigned char *s = (unsigned char *)rawHeader;
 
 	header->name  = rawHeader->name;
+	/* Check for and relativify any absolute paths */
+	if ( *(header->name) == '/' ) {
+		static int alreadyWarned=FALSE;
+
+		while (*(header->name) == '/')
+			++*(header->name);
+
+		if (alreadyWarned == FALSE) {
+			errorMsg("tar: Removing leading '/' from member names\n");
+			alreadyWarned = TRUE;
+		}
+	}
+
 	header->mode  = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
 	header->uid   =  getOctal(rawHeader->uid, sizeof(rawHeader->uid));
 	header->gid   =  getOctal(rawHeader->gid, sizeof(rawHeader->gid));
@@ -458,12 +497,16 @@ parseTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
 	header->devminor  = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
 
 	/* Check the checksum */
-	sum = ' ' * sizeof(rawHeader->chksum);
-	for ( i = TarChecksumOffset; i > 0; i-- )
-		sum += *s++;
-	s += sizeof(rawHeader->chksum);       
-	for ( i = (512 - TarChecksumOffset - sizeof(rawHeader->chksum)); i > 0; i-- )
+	for (i = sizeof(*rawHeader); i-- != 0;) {
 		sum += *s++;
+	}
+	/* Remove the effects of the checksum field (replace 
+	 * with blanks for the purposes of the checksum) */
+	s = rawHeader->chksum;
+	for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
+		sum -= *s++;
+	}
+	sum += ' ' * sizeof(rawHeader->chksum);
 	if (sum == chksum )
 		return ( TRUE);
 	return( FALSE);
@@ -475,14 +518,15 @@ parseTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
  * If the list is empty than all files are extracted or listed.
  */
 static int readTarFile(const char* tarName, int extractFlag, int listFlag, 
-		int tostdoutFlag, int verboseFlag)
+		int tostdoutFlag, int verboseFlag, char** excludeList)
 {
-	int status, tarFd=0;
+	int status, tarFd=-1;
 	int errorFlag=FALSE;
 	TarHeader rawHeader;
 	TarInfo header;
-	int alreadyWarned=FALSE;
-	//int skipFileFlag=FALSE;
+#if defined BB_FEATURE_TAR_EXCLUDE
+	char** tmpList;
+#endif
 
 	/* Open the tar file for reading.  */
 	if (!strcmp(tarName, "-"))
@@ -502,8 +546,7 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 	while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
 
 		/* First, try to read the header */
-		if ( parseTarHeader(&rawHeader, &header) == FALSE ) {
-			close( tarFd);
+		if ( readTarHeader(&rawHeader, &header) == FALSE ) {
 			if ( *(header.name) == '\0' ) {
 				goto endgame;
 			} else {
@@ -514,26 +557,54 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 		}
 		if ( *(header.name) == '\0' )
 				goto endgame;
-
-		/* Check for and relativify any absolute paths */
-		if ( *(header.name) == '/' ) {
-
-			while (*(header.name) == '/')
-				++*(header.name);
-
-			if (alreadyWarned == FALSE) {
-				errorMsg("Absolute path detected, removing leading slashes\n");
-				alreadyWarned = TRUE;
+		header.tarFd = tarFd;
+
+#if defined BB_FEATURE_TAR_EXCLUDE
+		{
+			int skipFlag=FALSE;
+			/* Check for excluded files....  */
+			for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
+				/* Do some extra hoop jumping for when directory names
+				 * end in '/' but the entry in tmpList doesn't */
+				if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
+							header.name[strlen(header.name)-1]=='/'
+							&& strncmp( *tmpList, header.name, 
+								MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
+					/* If it is a regular file, pretend to extract it with
+					 * the extractFlag set to FALSE, so the junk in the tarball
+					 * is properly skipped over */
+					if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
+							tarExtractRegularFile(&header, FALSE, FALSE);
+					}
+					skipFlag=TRUE;
+					break;
+				}
 			}
+			/* There are not the droids you're looking for, move along */
+			if (skipFlag==TRUE)
+				continue;
 		}
-
+#endif
 		/* Special treatment if the list (-t) flag is on */
 		if (verboseFlag == TRUE && extractFlag == FALSE) {
 			int len, len1;
 			char buf[35];
 			struct tm *tm = localtime (&(header.mtime));
 
-			len=printf("%s %d/%-d ", modeString(header.mode), header.uid, header.gid);
+			len=printf("%s ", modeString(header.mode));
+			memset(buf, 0, 8*sizeof(char));
+			my_getpwuid(buf, header.uid);
+			if (! *buf)
+				len+=printf("%d", header.uid);
+			else
+				len+=printf("%s", buf);
+			memset(buf, 0, 8*sizeof(char));
+			my_getgrgid(buf, header.gid);
+			if (! *buf)
+				len+=printf("/%-d ", header.gid);
+			else
+				len+=printf("/%-s ", buf);
+
 			if (header.type==CHRTYPE || header.type==BLKTYPE) {
 				len1=snprintf(buf, sizeof(buf), "%ld,%-ld ", 
 						header.devmajor, header.devminor);
@@ -556,21 +627,20 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 		if (verboseFlag == TRUE || listFlag == TRUE) {
 			/* Now the normal listing */
 			printf("%s", header.name);
+		}
+		if (verboseFlag == TRUE && listFlag == TRUE) {
 			/* If this is a link, say so */
 			if (header.type==LNKTYPE)
 				printf(" link to %s", header.linkname);
 			else if (header.type==SYMTYPE)
 				printf(" -> %s", header.linkname);
+		}
+		if (verboseFlag == TRUE || listFlag == TRUE) {
 			printf("\n");
 		}
 
-#if 0
-		/* See if we want to restore this file or not */
-		skipFileFlag=FALSE;
-		if (wantFileName(outName) == FALSE) {
-			skipFileFlag = TRUE;
-		}
-#endif
+		/* Remove any clutter lying in our way */
+		unlink( header.name);
 
 		/* If we got here, we can be certain we have a legitimate 
 		 * header to work with.  So work with it.  */
@@ -580,22 +650,27 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 				/* If the name ends in a '/' then assume it is
 				 * supposed to be a directory, and fall through */
 				if (header.name[strlen(header.name)-1] != '/') {
-					tarExtractRegularFile(&header, extractFlag, tostdoutFlag);
+					if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
+						errorFlag=TRUE;
 					break;
 				}
 			case DIRTYPE:
-				tarExtractDirectory( &header, extractFlag, tostdoutFlag);
+				if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
+					errorFlag=TRUE;
 				break;
 			case LNKTYPE:
-				tarExtractHardLink( &header, extractFlag, tostdoutFlag);
+				if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
+					errorFlag=TRUE;
 				break;
 			case SYMTYPE:
-				tarExtractSymLink( &header, extractFlag, tostdoutFlag);
+				if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
+					errorFlag=TRUE;
 				break;
 			case CHRTYPE:
 			case BLKTYPE:
 			case FIFOTYPE:
-				tarExtractSpecial( &header, extractFlag, tostdoutFlag);
+				if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
+					errorFlag=TRUE;
 				break;
 			default:
 				close( tarFd);
@@ -608,14 +683,19 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 		errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
 		return ( FALSE);
 	}
-	else 
+	else if (errorFlag==TRUE) {
+		errorMsg( "tar: Error exit delayed from previous errors\n");
+		return( FALSE);
+	} else 
 		return( status);
 
 	/* Stuff to do when we are done */
 endgame:
 	close( tarFd);
 	if ( *(header.name) == '\0' ) {
-		if (errorFlag==FALSE)
+		if (errorFlag==TRUE)
+			errorMsg( "tar: Error exit delayed from previous errors\n");
+		else
 			return( TRUE);
 	} 
 	return( FALSE);
@@ -624,24 +704,37 @@ endgame:
 
 #ifdef BB_FEATURE_TAR_CREATE
 
+/* Some info to be carried along when creating a new tarball */
+struct TarBallInfo
+{
+	char* fileName;               /* File name of the tarball */
+	int tarFd;                    /* Open-for-write file descriptor
+									 for the tarball */
+	struct stat statBuf;          /* Stat info for the tarball, letting
+									 us know the inode and device that the
+									 tarball lives, so we can avoid trying 
+									 to include the tarball into itself */
+	int verboseFlag;              /* Whether to print extra stuff or not */
+	char** excludeList;           /* List of files to not include */
+};
+typedef struct TarBallInfo TarBallInfo;
+
+
 /* Put an octal string into the specified buffer.
  * The number is zero and space padded and possibly null padded.
  * Returns TRUE if successful.  */ 
 static int putOctal (char *cp, int len, long value)
 {
 	int tempLength;
-	char *tempString;
 	char tempBuffer[32];
+	char *tempString = tempBuffer;
 
 	/* Create a string of the specified length with an initial space,
 	 * leading zeroes and the octal number, and a trailing null.  */
-	tempString = tempBuffer;
-
-	sprintf (tempString, " %0*lo", len - 2, value);
-
-	tempLength = strlen (tempString) + 1;
+	sprintf (tempString, "%0*lo", len - 1, value);
 
 	/* If the string is too large, suppress the leading space.  */
+	tempLength = strlen (tempString) + 1;
 	if (tempLength > len) {
 		tempLength--;
 		tempString++;
@@ -661,46 +754,238 @@ static int putOctal (char *cp, int len, long value)
 	return TRUE;
 }
 
-static int fileAction(const char *fileName, struct stat *statbuf)
+/* Write out a tar header for the specified file/directory/whatever */
+static int
+writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
 {
-	fprintf(stdout, "%s\n", fileName);
-	return (TRUE);
+	long chksum=0;
+	struct TarHeader header;
+#if defined BB_FEATURE_TAR_EXCLUDE
+	char** tmpList;
+#endif
+	const unsigned char *cp = (const unsigned char *) &header;
+	ssize_t size = sizeof(struct TarHeader);
+
+	memset( &header, 0, size);
+
+	if (*fileName=='/') {
+		static int alreadyWarned=FALSE;
+		if (alreadyWarned==FALSE) {
+			errorMsg("tar: Removing leading '/' from member names\n");
+			alreadyWarned=TRUE;
+		}
+		strncpy(header.name, fileName+1, sizeof(header.name)); 
+	}
+	else {
+		strncpy(header.name, fileName, sizeof(header.name)); 
+	}
+
+#if defined BB_FEATURE_TAR_EXCLUDE
+	/* Check for excluded files....  */
+	for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
+		/* Do some extra hoop jumping for when directory names
+		 * end in '/' but the entry in tmpList doesn't */
+		if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
+					header.name[strlen(header.name)-1]=='/'
+					&& strncmp( *tmpList, header.name, 
+						MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
+			/* Set the mode to something that is not a regular file, thereby
+			 * faking out writeTarFile into thinking that nothing further need
+			 * be done for this file.  Yes, I know this is ugly, but it works. */
+			statbuf->st_mode = 0;
+			return( TRUE);
+		}
+	}
+#endif
+
+	putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
+	putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
+	putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
+	putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
+	putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
+	strncpy(header.magic, TAR_MAGIC TAR_VERSION, 
+			TAR_MAGIC_LEN + TAR_VERSION_LEN );
+
+	/* Enter the user and group names (default to root if it fails) */
+	my_getpwuid(header.uname, statbuf->st_uid);
+	if (! *header.uname)
+		strcpy(header.uname, "root");
+	my_getgrgid(header.gname, statbuf->st_gid);
+	if (! *header.uname)
+		strcpy(header.uname, "root");
+
+	/* WARNING/NOTICE: I break Hard Links */
+	if (S_ISLNK(statbuf->st_mode)) {
+		char buffer[BUFSIZ];
+		header.typeflag  = SYMTYPE;
+		if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
+			errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
+			return ( FALSE);
+		}
+		strncpy(header.linkname, buffer, sizeof(header.linkname)); 
+	} else if (S_ISDIR(statbuf->st_mode)) {
+		header.typeflag  = DIRTYPE;
+		strncat(header.name, "/", sizeof(header.name)); 
+	} else if (S_ISCHR(statbuf->st_mode)) {
+		header.typeflag  = CHRTYPE;
+		putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
+		putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
+	} else if (S_ISBLK(statbuf->st_mode)) {
+		header.typeflag  = BLKTYPE;
+		putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
+		putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
+	} else if (S_ISFIFO(statbuf->st_mode)) {
+		header.typeflag  = FIFOTYPE;
+	} else if (S_ISREG(statbuf->st_mode)) {
+		header.typeflag  = REGTYPE;
+		putOctal(header.size, sizeof(header.size), statbuf->st_size);
+	} else {
+		errorMsg("tar: %s: Unknown file type\n", fileName);
+		return ( FALSE);
+	}
+
+	/* Calculate and store the checksum (i.e. the sum of all of the bytes of
+	 * the header).  The checksum field must be filled with blanks for the
+	 * calculation.  The checksum field is formatted differently from the
+	 * other fields: it has [6] digits, a null, then a space -- rather than
+	 * digits, followed by a null like the other fields... */
+	memset(header.chksum, ' ', sizeof(header.chksum));
+	cp = (const unsigned char *) &header;
+	while (size-- > 0)
+		chksum += *cp++;
+	putOctal(header.chksum, 7, chksum);
+	
+	/* Now write the header out to disk */
+	if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
+		errorMsg(io_error, fileName, strerror(errno)); 
+		return ( FALSE);
+	}
+	/* Pad the header up to the tar block size */
+	for (; size<TAR_BLOCK_SIZE; size++) {
+		write(tbInfo->tarFd, "\0", 1);
+	}
+	/* Now do the verbose thing (or not) */
+	if (tbInfo->verboseFlag==TRUE)
+		fprintf(stdout, "%s\n", header.name);
+
+	return ( TRUE);
+}
+
+
+static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
+{
+	struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
+
+	/* It is against the rules to archive a socket */
+	if (S_ISSOCK(statbuf->st_mode)) {
+		errorMsg("tar: %s: socket ignored\n", fileName);
+		return( TRUE);
+	}
+
+	/* It is a bad idea to store the archive we are in the process of creating,
+	 * so check the device and inode to be sure that this particular file isn't
+	 * the new tarball */
+	if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
+			tbInfo->statBuf.st_ino == statbuf->st_ino) {
+		errorMsg("tar: %s: file is the archive; skipping\n", fileName);
+		return( TRUE);
+	}
+
+	if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
+		return( FALSE);
+	} 
+
+	/* Now, if the file is a regular file, copy it out to the tarball */
+	if (S_ISREG(statbuf->st_mode)) {
+		int  inputFileFd;
+		char buffer[BUFSIZ];
+		ssize_t size=0, readSize=0;
+
+		/* open the file we want to archive, and make sure all is well */
+		if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
+			errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
+			return( FALSE);
+		}
+		
+		/* write the file to the archive */
+		while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
+			if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
+				/* Output file seems to have a problem */
+				errorMsg(io_error, fileName, strerror(errno)); 
+				return( FALSE);
+			}
+			readSize+=size;
+		}
+		if (size == -1) {
+			errorMsg(io_error, fileName, strerror(errno)); 
+			return( FALSE);
+		}
+		/* Pad the file up to the tar block size */
+		for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
+			write(tbInfo->tarFd, "\0", 1);
+		}
+		close( inputFileFd);
+	}
+
+	return( TRUE);
 }
 
-static int writeTarFile(const char* tarName, int extractFlag, int listFlag, 
-		int tostdoutFlag, int verboseFlag, int argc, char **argv)
+static int writeTarFile(const char* tarName, int tostdoutFlag, 
+		int verboseFlag, int argc, char **argv, char** excludeList)
 {
-	int tarFd=0;
-	//int errorFlag=FALSE;
-	//TarHeader rawHeader;
-	//TarInfo header;
-	//int alreadyWarned=FALSE;
-	char *directory = ".";
-	//int skipFileFlag=FALSE;
+	int tarFd=-1;
+	int errorFlag=FALSE;
+	ssize_t size;
+	struct TarBallInfo tbInfo;
+	tbInfo.verboseFlag = verboseFlag;
+
+	/* Make sure there is at least one file to tar up.  */
+	if (argc <= 0)
+		fatalError("tar: Cowardly refusing to create an empty archive\n");
 
 	/* Open the tar file for writing.  */
-	if (!strcmp(tarName, "-"))
-		tarFd = fileno(stdout);
+	if (tostdoutFlag == TRUE)
+		tbInfo.tarFd = fileno(stdout);
 	else
-		tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-	if (tarFd < 0) {
-		errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
+		tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (tbInfo.tarFd < 0) {
+		errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
 		return ( FALSE);
 	}
+	tbInfo.excludeList=excludeList;
+	/* Store the stat info for the tarball's file, so
+	 * can avoid including the tarball into itself....  */
+	if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
+		fatalError(io_error, tarName, strerror(errno)); 
 
 	/* Set the umask for this process so it doesn't 
 	 * screw up permission setting for us later. */
 	umask(0);
 
 	/* Read the directory/files and iterate over them one at a time */
-	if (recursiveAction(directory, TRUE, FALSE, FALSE,
-						fileAction, fileAction) == FALSE) {
-		exit(FALSE);
+	while (argc-- > 0) {
+		if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
+					writeFileToTarball, writeFileToTarball, 
+					(void*) &tbInfo) == FALSE) {
+			errorFlag = TRUE;
+		}
+	}
+	/* Write two empty blocks to the end of the archive */
+	for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
+		write(tbInfo.tarFd, "\0", 1);
 	}
 
+	/* To be pedantically correct, we would check if the tarball
+	 * is smaller then 20 tar blocks, and pad it if it was smaller,
+	 * but that isn't necessary for GNU tar interoperability, and
+	 * so is considered a waste of space */
 
-	// TODO: DO STUFF HERE
+	/* Hang up the tools, close up shop, head home */
 	close(tarFd);
+	if (errorFlag == TRUE) {
+		errorMsg("tar: Error exit delayed from previous errors\n");
+		return(FALSE);
+	}
 	return( TRUE);
 }