*
* 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
#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)
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;
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;
}
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)) {
}
}
-/* 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 */
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;
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))
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;
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;
}
}
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;
((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;
}
rep0 |= i;
i <<= 1;
}
- }
+ } else
+ rep0 = pos_slot;
if (++rep0 == 0)
break;
}
continue;
/* One of our "wait" services */
if (WIFEXITED(status) && WEXITSTATUS(status))
- bb_error_msg("%s: exit status 0x%x",
+ bb_error_msg("%s: exit status %u",
sep->se_program, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
- bb_error_msg("%s: exit signal 0x%x",
+ bb_error_msg("%s: exit signal %u",
sep->se_program, WTERMSIG(status));
sep->se_wait = 1;
add_fd_to_set(sep->se_fd);
else
bb_sanitize_stdio();
if (!(opt & 4)) {
- openlog(applet_name, LOG_PID, LOG_DAEMON);
+ /* LOG_NDELAY: connect to syslog daemon NOW.
+ * Otherwise, we may open syslog socket
+ * in vforked child, making opened fds and syslog()
+ * internal state inconsistent.
+ * This was observed to leak file descriptors. */
+ openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
logmode = LOGMODE_SYSLOG;
}
if (rlim_ofile.rlim_cur != rlim_ofile_cur)
if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
bb_perror_msg("setrlimit");
- closelog();
+
+ /* closelog(); - WRONG. we are after vfork,
+ * this may confuse syslog() internal state.
+ * Let's hope libc sets syslog fd to CLOEXEC...
+ */
xmove_fd(ctrl, STDIN_FILENO);
xdup2(STDIN_FILENO, STDOUT_FILENO);
/* manpages of inetd I managed to find either say
* that stderr is also redirected to the network,
* or do not talk about redirection at all (!) */
- xdup2(STDIN_FILENO, STDERR_FILENO);
- /* NB: among others, this loop closes listening socket
+ if (!sep->se_wait) /* only for usual "tcp nowait" */
+ xdup2(STDIN_FILENO, STDERR_FILENO);
+ /* NB: among others, this loop closes listening sockets
* for nowait stream children */
for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
- maybe_close(sep2->se_fd);
+ if (sep2->se_fd != ctrl)
+ maybe_close(sep2->se_fd);
sigaction_set(SIGPIPE, &saved_pipe_handler);
restore_sigmask(&omask);
BB_EXECVP(sep->se_program, sep->se_argv);
* 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:
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;
/* 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
}
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
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;
}
projects / oweals / busybox.git / commitdiff