inet_cksum: big-endian fix

[oweals/busybox.git] / archival / tar.c

diff --git a/archival/tar.c b/archival/tar.c
index d43c8dee365c31c3e3fed3eaccdb04ea3dfb594d..375e838d279a54a4a3ae7fbd748c058cff7eb313 100644 (file)
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -264,7 +264,8 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
        PUT_OCTAL(header.uid, statbuf->st_uid);
        PUT_OCTAL(header.gid, statbuf->st_gid);
        memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
-       PUT_OCTAL(header.mtime, statbuf->st_mtime);
+       /* users report that files with negative st_mtime cause trouble, so: */
+       PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
 
        /* Enter the user and group names */
        safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
@@ -316,15 +317,42 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
        } else if (S_ISFIFO(statbuf->st_mode)) {
                header.typeflag = FIFOTYPE;
        } else if (S_ISREG(statbuf->st_mode)) {
-               if (sizeof(statbuf->st_size) > 4
-                && statbuf->st_size > (off_t)0777777777777LL
+               /* header.size field is 12 bytes long */
+               /* Does octal-encoded size fit? */
+               uoff_t filesize = statbuf->st_size;
+               if (sizeof(filesize) <= 4
+                || filesize <= (uoff_t)0777777777777LL
                ) {
+                       PUT_OCTAL(header.size, filesize);
+               }
+               /* Does base256-encoded size fit?
+                * It always does unless off_t is wider than 64 bits.
+                */
+               else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
+#if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
+                && (filesize <= 0x3fffffffffffffffffffffffLL)
+#endif
+               ) {
+                       /* GNU tar uses "base-256 encoding" for very large numbers.
+                        * Encoding is binary, with highest bit always set as a marker
+                        * and sign in next-highest bit:
+                        * 80 00 .. 00 - zero
+                        * bf ff .. ff - largest positive number
+                        * ff ff .. ff - minus 1
+                        * c0 00 .. 00 - smallest negative number
+                        */
+                       char *p8 = header.size + sizeof(header.size);
+                       do {
+                               *--p8 = (uint8_t)filesize;
+                               filesize >>= 8;
+                       } while (p8 != header.size);
+                       *p8 |= 0x80;
+               } else {
                        bb_error_msg_and_die("can't store file '%s' "
                                "of size %"OFF_FMT"u, aborting",
                                fileName, statbuf->st_size);
                }
                header.typeflag = REGTYPE;
-               PUT_OCTAL(header.size, statbuf->st_size);
        } else {
                bb_error_msg("%s: unknown file type", fileName);
                return FALSE;
@@ -731,7 +759,6 @@ static void handle_SIGCHLD(int status)
 //usage:       )
 //usage:     "\n       x       Extract"
 //usage:     "\n       t       List"
-//usage:     "\nOptions:"
 //usage:     "\n       f       Name of TARFILE ('-' for stdin/out)"
 //usage:     "\n       C       Change to DIR before operation"
 //usage:     "\n       v       Verbose"
@@ -897,7 +924,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
        /* Prepend '-' to the first argument if required */
        opt_complementary = "--:" // first arg is options
                "tt:vv:" // count -t,-v
-               "X::T::" // cumulative lists
+               IF_FEATURE_TAR_FROM("X::T::") // cumulative lists
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
                "\xff::" // cumulative lists for --exclude
 #endif
@@ -970,6 +997,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
                putenv((char*)"TAR_FILETYPE=f");
                signal(SIGPIPE, SIG_IGN);
                tar_handle->action_data = data_extract_to_command;
+               IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
        }
 
        if (opt & OPT_KEEP_OLD)