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authorMatt Kraai2000-09-04 08:25:42 +0000
committerMatt Kraai2000-09-04 08:25:42 +0000
commitb92223b6f5848b2cdb41c3a6b9261b47826a5816 (patch)
tree1e3243c5a24394b6c3a1030c44ee5394947862bf /tar.c
parentfd50c3d2f9ab76aaf3736090e278be8742155d9f (diff)
downloadbusybox-b92223b6f5848b2cdb41c3a6b9261b47826a5816.zip
busybox-b92223b6f5848b2cdb41c3a6b9261b47826a5816.tar.gz
Allow selective extraction and listing of files. And fix an unchecked
return value of realloc (with xrealloc).
Diffstat (limited to 'tar.c')
-rw-r--r--tar.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/tar.c b/tar.c
index 460962e..d3b0e5c 100644
--- a/tar.c
+++ b/tar.c
@@ -125,7 +125,8 @@ typedef struct TarInfo TarInfo;
/* Local procedures to restore files from a tar file. */
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, char** excludeList);
+ int tostdoutFlag, int verboseFlag, char** extractList,
+ char** excludeList);
@@ -190,7 +191,7 @@ extern int tar_main(int argc, char **argv)
if (strcmp(optarg, "exclude")==0) {
if (argv[optind]==NULL)
fatalError( "option `--exclude' requires an argument\n");
- excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
+ excludeList=xrealloc( excludeList, sizeof(char**) * (excludeListSize+2));
excludeList[excludeListSize] = argv[optind];
/* Remove leading "/"s */
if (*excludeList[excludeListSize] =='/') {
@@ -222,7 +223,7 @@ extern int tar_main(int argc, char **argv)
#endif
}
if (listFlag == TRUE || extractFlag == TRUE) {
- exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
+ exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, &argv[optind], excludeList));
}
flagError:
@@ -477,7 +478,8 @@ readTarHeader(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, char** excludeList)
+ int tostdoutFlag, int verboseFlag, char** extractList,
+ char** excludeList)
{
int status, tarFd=-1;
int errorFlag=FALSE;
@@ -544,6 +546,27 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
continue;
}
#endif
+ if (*extractList != NULL) {
+ int skipFlag = TRUE;
+ for (tmpList = extractList; *tmpList != NULL; tmpList++) {
+ 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 */
+ skipFlag = FALSE;
+ break;
+ }
+ }
+ /* There are not the droids you're looking for, move along */
+ if (skipFlag == TRUE) {
+ if ( header.type==REGTYPE || header.type==REGTYPE0 )
+ tarExtractRegularFile(&header, FALSE, FALSE);
+ continue;
+ }
+ }
/* Special treatment if the list (-t) flag is on */
if (verboseFlag == TRUE && extractFlag == FALSE) {
int len, len1;