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-rw-r--r--archival/ar.c229
1 files changed, 142 insertions, 87 deletions
diff --git a/archival/ar.c b/archival/ar.c
index 253f334..e58b739 100644
--- a/archival/ar.c
+++ b/archival/ar.c
@@ -21,6 +21,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
+ * Last modified 10 June 2000
*/
@@ -28,9 +29,18 @@
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
+#include <time.h>
+#include <utime.h>
+#include <sys/types.h>
#include "internal.h"
#define AR_BLOCK_SIZE 60
+#define AR_PRESERVE_DATE 1
+#define AR_VERBOSE 2
+#define AR_DISPLAY 4
+#define AR_EXT_TO_FILE 8
+#define AR_EXT_TO_STDOUT 16
+
#define BB_DECLARE_EXTERN
#define bb_need_io_error
#include "messages.c"
@@ -67,22 +77,50 @@ static const char ar_usage[] = "ar [optxvV] archive [filenames] \n"
#endif
;
-static void displayContents(struct ArInfo *entry, int funct)
+/*
+ * Display details of a file, verbosly if funct=2
+ */
+static void displayEntry(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,
+ if ((funct & AR_VERBOSE) == AR_VERBOSE)
+ printf("%i %i/%i %8i %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)
+/* this is from tar.c remove later*/
+static long getOctal(const char *cp, int size)
+{
+ long val = 0;
+
+ for(;(size > 0) && (*cp == ' '); cp++, size--);
+ if ((size == 0) || !isOctal(*cp))
+ return -1;
+ for(; (size > 0) && isOctal(*cp); size--) {
+ val = val * 8 + *cp++ - '0';
+ }
+ for (;(size > 0) && (*cp == ' '); cp++, size--);
+ if ((size > 0) && *cp)
+ return -1;
+ return val;
+}
+
+/*
+ * Converts from the char based struct to a new struct with stricter types
+ */
+static int processArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
{
int count2;
int count;
+
+ /* check end of header marker is valid */
+ if ((rawHeader->ar_fmag[0]!='`') || (rawHeader->ar_fmag[1]!='\n'))
+ return(FALSE);
+ /* convert filename */
for (count = 0; count < 16; count++) {
+ /* allow spaces in filename except at the end */
if (rawHeader->ar_name[count] == ' ') {
for (count2 = count; count2 < 16; count2++)
if (!isspace(rawHeader->ar_name[count2]))
@@ -90,6 +128,7 @@ static int readArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
if (count2 >= 16)
break;
}
+ /* GNU ar uses '/' as an end of filename marker */
if (rawHeader->ar_name[count] == '/')
break;
header->name[count] = rawHeader->ar_name[count];
@@ -98,15 +137,14 @@ static int readArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
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->mode = getOctal(rawHeader->ar_mode, sizeof(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 .
+ * taken from tarExtractRegularFile in tar.c, remove later
*/
static int copySubFile(int srcFd, int dstFd, int copySize)
{
@@ -134,17 +172,16 @@ static int copySubFile(int srcFd, int dstFd, int copySize)
}
/*
- * 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
+ * Extract the file described in ArInfo to the specified path
+ * set the new files uid, gid and mode
*/
-static int extractToFile(int srcFd, const char *path, const char *name,
- int size)
+static int extractToFile(struct ArInfo *file, int funct, int srcFd, const char *path)
{
int dstFd, temp;
struct stat tmpStat;
char *pathname = NULL;
-
+ struct utimbuf newtime;
+
if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
if (!createPath(path, 0777)) {
fatalError("Cannot extract to specified path");
@@ -154,95 +191,108 @@ static int extractToFile(int srcFd, const char *path, const char *name,
temp = (strlen(path) + 16);
pathname = (char *) xmalloc(temp);
pathname = strcpy(pathname, path);
- pathname = strcat(pathname, &name[0]);
+ pathname = strcat(pathname, file->name);
dstFd = device_open(pathname, O_WRONLY | O_CREAT);
- pathname = NULL;
- temp = copySubFile(srcFd, dstFd, size);
+ temp = copySubFile(srcFd, dstFd, file->size);
+ fchown(dstFd, file->uid, file->gid);
+ fchmod(dstFd, file->mode);
close(dstFd);
+ if ((funct&AR_PRESERVE_DATE)==AR_PRESERVE_DATE)
+ newtime.modtime=file->date;
+ else
+ newtime.modtime=time(0);
+ newtime.actime=time(0);
+ temp = utime(pathname, &newtime);
return (TRUE);
}
-/* Step through the ar file entries */
-static int readArFile(char **fileNames, int argc, int funct)
+/*
+ * Return a file descriptor for the specified file and do error checks
+ */
+static int getArFd(char *filename)
{
- 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;
+ int arFd;
+ char arVersion[8];
- 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);
- }
- if (strncmp(arVersion, "!<arch>", 7) != 0) {
- errorMsg("ar header fails check ");
+ arFd = open(filename, O_RDONLY);
+ if (arFd < 0) {
+ errorMsg("Error opening '%s': %s\n", filename, strerror(errno));
return (FALSE);
}
+ if (fullRead(arFd, arVersion, 8) <= 0) {
+ errorMsg( "ar: Unexpected EOF in archive\n");
+ return (FALSE);
+ }
+ if (strncmp(arVersion,"!<arch>",7) != 0) {
+ errorMsg("ar header fails check ");
+ return(FALSE);
+ }
+ return arFd;
+}
+
+/*
+ * Step through the ar file and process it one entry at a time
+ * fileList[0] is the name of the ar archive
+ * fileList[1] and up are filenames to extract from the archive
+ * funct contains flags to specify the actions to be performed
+ */
+static int readArFile(char *fileList[16], int fileListSize, int funct)
+{
+ int arFd, status, extFileFlag, i, lastOffset=0;
+ ArHeader rawArHeader;
+ ArInfo arEntry;
+
+ /* open the ar archive */
+ arFd=getArFd(fileList[0]);
+
+ /* read the first header, then loop until ono more headers */
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);
+ /* check the header is valid, if not try reading the header
+ agian with an offset of 1, needed as some ar archive end
+ with a '\n' which isnt counted in specified file size */
+ if ((status=processArHeader(&rawArHeader, &arEntry))==FALSE ) {
+ if ((i=lseek(arFd, 0, SEEK_CUR))==(lastOffset+60))
+ lseek(arFd, lastOffset+1, SEEK_SET);
+ else
+ return(FALSE);
+ }
+ else {
+ extFileFlag=0;
+
+ if (funct&AR_DISPLAY)
+ displayEntry(&arEntry, funct);
+
+ /* check file was specified to be extracted only if
+ some file were specified */
+ if ((funct&AR_EXT_TO_FILE) || (funct&AR_EXT_TO_STDOUT)){
+ if (fileListSize==1)
+ extFileFlag=1;
+ else {
+ for( i=1; i<=fileListSize; i++)
+ if ((status=(strcmp(fileList[i],arEntry.name)))==0)
+ extFileFlag=1;
+ }
}
- } else
- lseek(arFd, arEntry.size, SEEK_CUR);
- }
- return (0);
+ if (extFileFlag==1) {
+ if (funct&AR_EXT_TO_FILE)
+ extractToFile(&arEntry, funct, arFd, "./");
+ else
+ copySubFile(arFd,fileno(stdout),arEntry.size);
+ }
+ else
+ lseek(arFd, arEntry.size, SEEK_CUR);
+ lastOffset=lseek(arFd, 0, SEEK_CUR);
+ } /* if processArHeader */
+ } /* while */
+ return (TRUE);
}
extern int ar_main(int argc, char **argv)
{
- int ret = 0;
- char *opt_ptr;
- char c;
- int funct = 0;
+ int funct = 0, ret=0, i=0;
+ char *fileList[16], c, *opt_ptr;
if (argc < 2)
usage(ar_usage);
@@ -271,7 +321,12 @@ extern int ar_main(int argc, char **argv)
usage(ar_usage);
}
}
+
+ for(i=0; i<(argc-2); i++)
+ fileList[i]=argv[i+2];
+
if (funct > 3)
- ret = readArFile(argv, argc, funct);
+ ret = readArFile(fileList, (argc-2), funct);
+
return (ret);
}
generated by cgit v1.1 at 2024-12-27 12:58:50 +0000