--- /dev/null
+diff -urpN busybox-1.15.0/shell/hush.c busybox-1.15.0-hush/shell/hush.c
+--- busybox-1.15.0/shell/hush.c 2009-08-21 00:26:14.000000000 +0200
++++ busybox-1.15.0-hush/shell/hush.c 2009-09-05 20:08:50.000000000 +0200
+@@ -58,7 +58,7 @@
+ * TODOs:
+ * grep for "TODO" and fix (some of them are easy)
+ * builtins: ulimit
+- * special variables (PWD etc)
++ * special variables (done: PWD)
+ * follow IFS rules more precisely, including update semantics
+ * export builtin should be special, its arguments are assignments
+ * and therefore expansion of them should be "one-word" expansion:
+@@ -1432,6 +1432,13 @@ static int set_local_var(char *str, int
+ return 0;
+ }
+
++/* Used at startup and after each cd */
++static void set_pwd_var(int exp)
++{
++ set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)),
++ /*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0);
++}
++
+ static int unset_local_var_len(const char *name, int name_len)
+ {
+ struct variable *cur;
+@@ -1604,6 +1611,9 @@ static const char* setup_prompt_string(i
+ /* Set up the prompt */
+ if (promptmode == 0) { /* PS1 */
+ free((char*)G.PS1);
++ /* bash uses $PWD value, even if it is set by user.
++ * It uses current dir only if PWD is unset.
++ * We always use current dir. */
+ G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
+ prompt_str = G.PS1;
+ } else
+@@ -6432,8 +6442,49 @@ int hush_main(int argc, char **argv)
+ }
+ e++;
+ }
++ /* reinstate HUSH_VERSION */
+ debug_printf_env("putenv '%s'\n", hush_version_str);
+- putenv((char *)hush_version_str); /* reinstate HUSH_VERSION */
++ putenv((char *)hush_version_str);
++
++ /* Export PWD */
++ set_pwd_var(/*exp:*/ 1);
++ /* bash also exports SHLVL and _,
++ * and sets (but doesn't export) the following variables:
++ * BASH=/bin/bash
++ * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
++ * BASH_VERSION='3.2.0(1)-release'
++ * HOSTTYPE=i386
++ * MACHTYPE=i386-pc-linux-gnu
++ * OSTYPE=linux-gnu
++ * HOSTNAME=<xxxxxxxxxx>
++ * PPID=<NNNNN>
++ * EUID=<NNNNN>
++ * UID=<NNNNN>
++ * GROUPS=()
++ * LINES=<NNN>
++ * COLUMNS=<NNN>
++ * BASH_ARGC=()
++ * BASH_ARGV=()
++ * BASH_LINENO=()
++ * BASH_SOURCE=()
++ * DIRSTACK=()
++ * PIPESTATUS=([0]="0")
++ * HISTFILE=/<xxx>/.bash_history
++ * HISTFILESIZE=500
++ * HISTSIZE=500
++ * MAILCHECK=60
++ * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
++ * SHELL=/bin/bash
++ * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
++ * TERM=dumb
++ * OPTERR=1
++ * OPTIND=1
++ * IFS=$' \t\n'
++ * PS1='\s-\v\$ '
++ * PS2='> '
++ * PS4='+ '
++ */
++
+ #if ENABLE_FEATURE_EDITING
+ G.line_input_state = new_line_input_t(FOR_SHELL);
+ #endif
+@@ -6816,7 +6867,11 @@ static int FAST_FUNC builtin_cd(char **a
+ bb_perror_msg("cd: %s", newdir);
+ return EXIT_FAILURE;
+ }
+- get_cwd(1);
++ /* Read current dir (get_cwd(1) is inside) and set PWD.
++ * Note: do not enforce exporting. If PWD was unset or unexported,
++ * set it again, but do not export. bash does the same.
++ */
++ set_pwd_var(/*exp:*/ 0);
+ return EXIT_SUCCESS;
+ }
+
--- /dev/null
+diff -urpN busybox-1.15.0/archival/Config.in busybox-1.15.0-unlzma/archival/Config.in
+--- busybox-1.15.0/archival/Config.in 2009-08-21 00:26:13.000000000 +0200
++++ busybox-1.15.0-unlzma/archival/Config.in 2009-09-06 15:10:58.000000000 +0200
+@@ -298,8 +298,8 @@ config FEATURE_LZMA_FAST
+ default n
+ depends on UNLZMA
+ help
+- This option reduces decompression time by about 25% at the cost of
+- a 1K bigger binary.
++ This option reduces decompression time by about 33% at the cost of
++ a 2K bigger binary.
+
+ config UNZIP
+ bool "unzip"
+diff -urpN busybox-1.15.0/archival/libunarchive/decompress_unlzma.c busybox-1.15.0-unlzma/archival/libunarchive/decompress_unlzma.c
+--- busybox-1.15.0/archival/libunarchive/decompress_unlzma.c 2009-08-21 00:26:13.000000000 +0200
++++ busybox-1.15.0-unlzma/archival/libunarchive/decompress_unlzma.c 2009-09-06 15:10:58.000000000 +0200
+@@ -8,15 +8,14 @@
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
++
+ #include "libbb.h"
+ #include "unarchive.h"
+
+ #if ENABLE_FEATURE_LZMA_FAST
+ # define speed_inline ALWAYS_INLINE
+-# define size_inline
+ #else
+ # define speed_inline
+-# define size_inline ALWAYS_INLINE
+ #endif
+
+
+@@ -45,8 +44,8 @@ typedef struct {
+ #define RC_MODEL_TOTAL_BITS 11
+
+
+-/* Called twice: once at startup (LZMA_FAST only) and once in rc_normalize() */
+-static size_inline void rc_read(rc_t *rc)
++/* Called twice: once at startup and once in rc_normalize() */
++static void rc_read(rc_t *rc)
+ {
+ int buffer_size = safe_read(rc->fd, RC_BUFFER, RC_BUFFER_SIZE);
+ if (buffer_size <= 0)
+@@ -55,17 +54,8 @@ static size_inline void rc_read(rc_t *rc
+ rc->buffer_end = RC_BUFFER + buffer_size;
+ }
+
+-/* Called twice, but one callsite is in speed_inline'd rc_is_bit_1() */
+-static void rc_do_normalize(rc_t *rc)
+-{
+- if (rc->ptr >= rc->buffer_end)
+- rc_read(rc);
+- rc->range <<= 8;
+- rc->code = (rc->code << 8) | *rc->ptr++;
+-}
+-
+ /* Called once */
+-static ALWAYS_INLINE rc_t* rc_init(int fd) /*, int buffer_size) */
++static rc_t* rc_init(int fd) /*, int buffer_size) */
+ {
+ int i;
+ rc_t *rc;
+@@ -73,18 +63,17 @@ static ALWAYS_INLINE rc_t* rc_init(int f
+ rc = xmalloc(sizeof(*rc) + RC_BUFFER_SIZE);
+
+ rc->fd = fd;
++ /* rc->buffer_size = buffer_size; */
++ rc->buffer_end = RC_BUFFER + RC_BUFFER_SIZE;
+ rc->ptr = rc->buffer_end;
+
++ rc->code = 0;
++ rc->range = 0xFFFFFFFF;
+ for (i = 0; i < 5; i++) {
+-#if ENABLE_FEATURE_LZMA_FAST
+ if (rc->ptr >= rc->buffer_end)
+ rc_read(rc);
+ rc->code = (rc->code << 8) | *rc->ptr++;
+-#else
+- rc_do_normalize(rc);
+-#endif
+ }
+- rc->range = 0xFFFFFFFF;
+ return rc;
+ }
+
+@@ -94,6 +83,14 @@ static ALWAYS_INLINE void rc_free(rc_t *
+ free(rc);
+ }
+
++/* Called twice, but one callsite is in speed_inline'd rc_is_bit_0_helper() */
++static void rc_do_normalize(rc_t *rc)
++{
++ if (rc->ptr >= rc->buffer_end)
++ rc_read(rc);
++ rc->range <<= 8;
++ rc->code = (rc->code << 8) | *rc->ptr++;
++}
+ static ALWAYS_INLINE void rc_normalize(rc_t *rc)
+ {
+ if (rc->range < (1 << RC_TOP_BITS)) {
+@@ -101,28 +98,49 @@ static ALWAYS_INLINE void rc_normalize(r
+ }
+ }
+
+-/* rc_is_bit_1 is called 9 times */
+-static speed_inline int rc_is_bit_1(rc_t *rc, uint16_t *p)
++/* rc_is_bit_0 is called 9 times */
++/* Why rc_is_bit_0_helper exists?
++ * Because we want to always expose (rc->code < rc->bound) to optimizer.
++ * Thus rc_is_bit_0 is always inlined, and rc_is_bit_0_helper is inlined
++ * only if we compile for speed.
++ */
++static speed_inline uint32_t rc_is_bit_0_helper(rc_t *rc, uint16_t *p)
+ {
+ rc_normalize(rc);
+ rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
+- if (rc->code < rc->bound) {
+- rc->range = rc->bound;
+- *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
+- return 0;
+- }
++ return rc->bound;
++}
++static ALWAYS_INLINE int rc_is_bit_0(rc_t *rc, uint16_t *p)
++{
++ uint32_t t = rc_is_bit_0_helper(rc, p);
++ return rc->code < t;
++}
++
++/* Called ~10 times, but very small, thus inlined */
++static speed_inline void rc_update_bit_0(rc_t *rc, uint16_t *p)
++{
++ rc->range = rc->bound;
++ *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
++}
++static speed_inline void rc_update_bit_1(rc_t *rc, uint16_t *p)
++{
+ rc->range -= rc->bound;
+ rc->code -= rc->bound;
+ *p -= *p >> RC_MOVE_BITS;
+- return 1;
+ }
+
+ /* Called 4 times in unlzma loop */
+-static speed_inline int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
++static int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
+ {
+- int ret = rc_is_bit_1(rc, p);
+- *symbol = *symbol * 2 + ret;
+- return ret;
++ if (rc_is_bit_0(rc, p)) {
++ rc_update_bit_0(rc, p);
++ *symbol *= 2;
++ return 0;
++ } else {
++ rc_update_bit_1(rc, p);
++ *symbol = *symbol * 2 + 1;
++ return 1;
++ }
+ }
+
+ /* Called once */
+@@ -248,13 +266,13 @@ unpack_lzma_stream(int src_fd, int dst_f
+ header.dst_size = SWAP_LE64(header.dst_size);
+
+ if (header.dict_size == 0)
+- header.dict_size++;
++ header.dict_size = 1;
+
+ buffer = xmalloc(MIN(header.dst_size, header.dict_size));
+
+ num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
+ p = xmalloc(num_probs * sizeof(*p));
+- num_probs += LZMA_LITERAL - LZMA_BASE_SIZE;
++ num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
+ for (i = 0; i < num_probs; i++)
+ p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
+
+@@ -264,8 +282,9 @@ unpack_lzma_stream(int src_fd, int dst_f
+ int pos_state = (buffer_pos + global_pos) & pos_state_mask;
+
+ prob = p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + pos_state;
+- if (!rc_is_bit_1(rc, prob)) {
++ if (rc_is_bit_0(rc, prob)) {
+ mi = 1;
++ rc_update_bit_0(rc, prob);
+ prob = (p + LZMA_LITERAL
+ + (LZMA_LIT_SIZE * ((((buffer_pos + global_pos) & literal_pos_mask) << lc)
+ + (previous_byte >> (8 - lc))
+@@ -321,21 +340,27 @@ unpack_lzma_stream(int src_fd, int dst_f
+ int offset;
+ uint16_t *prob_len;
+
++ rc_update_bit_1(rc, prob);
+ prob = p + LZMA_IS_REP + state;
+- if (!rc_is_bit_1(rc, prob)) {
++ if (rc_is_bit_0(rc, prob)) {
++ rc_update_bit_0(rc, prob);
+ rep3 = rep2;
+ rep2 = rep1;
+ rep1 = rep0;
+ state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
+ prob = p + LZMA_LEN_CODER;
+ } else {
+- prob += LZMA_IS_REP_G0 - LZMA_IS_REP;
+- if (!rc_is_bit_1(rc, prob)) {
++ rc_update_bit_1(rc, prob);
++ prob = p + LZMA_IS_REP_G0 + state;
++ if (rc_is_bit_0(rc, prob)) {
++ rc_update_bit_0(rc, prob);
+ prob = (p + LZMA_IS_REP_0_LONG
+ + (state << LZMA_NUM_POS_BITS_MAX)
+ + pos_state
+ );
+- if (!rc_is_bit_1(rc, prob)) {
++ if (rc_is_bit_0(rc, prob)) {
++ rc_update_bit_0(rc, prob);
++
+ state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
+ #if ENABLE_FEATURE_LZMA_FAST
+ pos = buffer_pos - rep0;
+@@ -347,16 +372,25 @@ unpack_lzma_stream(int src_fd, int dst_f
+ len = 1;
+ goto string;
+ #endif
++ } else {
++ rc_update_bit_1(rc, prob);
+ }
+ } else {
+ uint32_t distance;
+
+- prob += LZMA_IS_REP_G1 - LZMA_IS_REP_G0;
+- distance = rep1;
+- if (rc_is_bit_1(rc, prob)) {
+- prob += LZMA_IS_REP_G2 - LZMA_IS_REP_G1;
+- distance = rep2;
+- if (rc_is_bit_1(rc, prob)) {
++ rc_update_bit_1(rc, prob);
++ prob = p + LZMA_IS_REP_G1 + state;
++ if (rc_is_bit_0(rc, prob)) {
++ rc_update_bit_0(rc, prob);
++ distance = rep1;
++ } else {
++ rc_update_bit_1(rc, prob);
++ prob = p + LZMA_IS_REP_G2 + state;
++ if (rc_is_bit_0(rc, prob)) {
++ rc_update_bit_0(rc, prob);
++ distance = rep2;
++ } else {
++ rc_update_bit_1(rc, prob);
+ distance = rep3;
+ rep3 = rep2;
+ }
+@@ -370,20 +404,24 @@ unpack_lzma_stream(int src_fd, int dst_f
+ }
+
+ prob_len = prob + LZMA_LEN_CHOICE;
+- if (!rc_is_bit_1(rc, prob_len)) {
+- prob_len += LZMA_LEN_LOW - LZMA_LEN_CHOICE
+- + (pos_state << LZMA_LEN_NUM_LOW_BITS);
++ if (rc_is_bit_0(rc, prob_len)) {
++ rc_update_bit_0(rc, prob_len);
++ prob_len = (prob + LZMA_LEN_LOW
++ + (pos_state << LZMA_LEN_NUM_LOW_BITS));
+ offset = 0;
+ num_bits = LZMA_LEN_NUM_LOW_BITS;
+ } else {
+- prob_len += LZMA_LEN_CHOICE_2 - LZMA_LEN_CHOICE;
+- if (!rc_is_bit_1(rc, prob_len)) {
+- prob_len += LZMA_LEN_MID - LZMA_LEN_CHOICE_2
+- + (pos_state << LZMA_LEN_NUM_MID_BITS);
++ rc_update_bit_1(rc, prob_len);
++ prob_len = prob + LZMA_LEN_CHOICE_2;
++ if (rc_is_bit_0(rc, prob_len)) {
++ rc_update_bit_0(rc, prob_len);
++ prob_len = (prob + LZMA_LEN_MID
++ + (pos_state << LZMA_LEN_NUM_MID_BITS));
+ offset = 1 << LZMA_LEN_NUM_LOW_BITS;
+ num_bits = LZMA_LEN_NUM_MID_BITS;
+ } else {
+- prob_len += LZMA_LEN_HIGH - LZMA_LEN_CHOICE_2;
++ rc_update_bit_1(rc, prob_len);
++ prob_len = prob + LZMA_LEN_HIGH;
+ offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
+ + (1 << LZMA_LEN_NUM_MID_BITS));
+ num_bits = LZMA_LEN_NUM_HIGH_BITS;
+@@ -400,20 +438,19 @@ unpack_lzma_stream(int src_fd, int dst_f
+ ((len < LZMA_NUM_LEN_TO_POS_STATES ? len :
+ LZMA_NUM_LEN_TO_POS_STATES - 1)
+ << LZMA_NUM_POS_SLOT_BITS);
+- rc_bit_tree_decode(rc, prob,
+- LZMA_NUM_POS_SLOT_BITS, &pos_slot);
+- rep0 = pos_slot;
++ rc_bit_tree_decode(rc, prob, LZMA_NUM_POS_SLOT_BITS,
++ &pos_slot);
+ if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
+ num_bits = (pos_slot >> 1) - 1;
+ rep0 = 2 | (pos_slot & 1);
+- prob = p + LZMA_ALIGN;
+ if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
+ rep0 <<= num_bits;
+- prob += LZMA_SPEC_POS - LZMA_ALIGN - 1 + rep0 - pos_slot;
++ prob = p + LZMA_SPEC_POS + rep0 - pos_slot - 1;
+ } else {
+ num_bits -= LZMA_NUM_ALIGN_BITS;
+ while (num_bits--)
+ rep0 = (rep0 << 1) | rc_direct_bit(rc);
++ prob = p + LZMA_ALIGN;
+ rep0 <<= LZMA_NUM_ALIGN_BITS;
+ num_bits = LZMA_NUM_ALIGN_BITS;
+ }
+@@ -424,7 +461,8 @@ unpack_lzma_stream(int src_fd, int dst_f
+ rep0 |= i;
+ i <<= 1;
+ }
+- }
++ } else
++ rep0 = pos_slot;
+ if (++rep0 == 0)
+ break;
+ }
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