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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2020-12-21 21:36:58 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2020-12-21 21:36:58 +0100
commit00eb23b47aa79461b913b320eba3c95b90e6eec4 (patch)
treeebeb54dcc6eb977247f5088be9cffc4deaea27e9
parente4202df0918e13130bb511a4ce372cbbe089068d (diff)
downloadbusybox-00eb23b47aa79461b913b320eba3c95b90e6eec4.tar.gz
busybox-00eb23b47aa79461b913b320eba3c95b90e6eec4.tar.bz2
bc: do not allocate line editing state until needed
function old new delta xc_read_line 324 353 +29 free_line_input_t 34 39 +5 xc_vm_init 656 640 -16 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 34/-16) Total: 18 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--include/libbb.h4
-rw-r--r--libbb/lineedit.c18
-rw-r--r--miscutils/bc.c37
-rw-r--r--shell/ash.c3
-rw-r--r--shell/hush.c3
5 files changed, 35 insertions, 30 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 1c3d905b6..cae54658b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1906,7 +1906,11 @@ enum {
FOR_SHELL = DO_HISTORY | TAB_COMPLETION | USERNAME_COMPLETION,
};
line_input_t *new_line_input_t(int flags) FAST_FUNC;
+#if ENABLE_FEATURE_EDITING_SAVEHISTORY
void free_line_input_t(line_input_t *n) FAST_FUNC;
+#else
+# define free_line_input_t(n) free(n)
+#endif
/*
* maxsize must be >= 2.
* Returns:
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index c3b5738e2..b3e7abac5 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -1417,15 +1417,19 @@ void FAST_FUNC show_history(const line_input_t *st)
printf("%4d %s\n", i, st->history[i]);
}
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
void FAST_FUNC free_line_input_t(line_input_t *n)
{
-# if ENABLE_FEATURE_EDITING_SAVEHISTORY
- int i = n->cnt_history;
- while (i > 0)
- free(n->history[--i]);
-#endif
- free(n);
+ if (n) {
+ int i = n->cnt_history;
+ while (i > 0)
+ free(n->history[--i]);
+ free(n);
+ }
}
+# else
+/* #defined to free() in libbb.h */
+# endif
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
/* We try to ensure that concurrent additions to the history
@@ -1506,7 +1510,7 @@ void save_history(line_input_t *st)
{
FILE *fp;
- if (!st->hist_file)
+ if (!st || !st->hist_file)
return;
if (st->cnt_history <= st->cnt_history_in_file)
return;
diff --git a/miscutils/bc.c b/miscutils/bc.c
index f339b895c..1227e2d13 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -2545,6 +2545,8 @@ static void xc_read_line(BcVec *vec, FILE *fp)
# if ENABLE_FEATURE_EDITING
if (G_ttyin && fp == stdin) {
int n, i;
+ if (!G.line_input_state)
+ G.line_input_state = new_line_input_t(DO_HISTORY);
# define line_buf bb_common_bufsiz1
n = read_line_input(G.line_input_state, "", line_buf, COMMON_BUFSIZE);
if (n <= 0) { // read errors or EOF, or ^D, or ^C
@@ -6872,22 +6874,6 @@ static BC_STATUS zxc_program_exec(void)
}
#define zxc_program_exec(...) (zxc_program_exec(__VA_ARGS__) COMMA_SUCCESS)
-static unsigned xc_vm_envLen(const char *var)
-{
- char *lenv;
- unsigned len;
-
- lenv = getenv(var);
- len = BC_NUM_PRINT_WIDTH;
- if (!lenv) return len;
-
- len = bb_strtou(lenv, NULL, 10) - 1;
- if (errno || len < 2 || len >= INT_MAX)
- len = BC_NUM_PRINT_WIDTH;
-
- return len;
-}
-
static BC_STATUS zxc_vm_process(const char *text)
{
BcStatus s;
@@ -7377,12 +7363,25 @@ static void xc_program_init(void)
bc_char_vec_init(&G.input_buffer);
}
+static unsigned xc_vm_envLen(const char *var)
+{
+ char *lenv;
+ unsigned len;
+
+ lenv = getenv(var);
+ len = BC_NUM_PRINT_WIDTH;
+ if (!lenv) return len;
+
+ len = bb_strtou(lenv, NULL, 10) - 1;
+ if (errno || len < 2 || len >= INT_MAX)
+ len = BC_NUM_PRINT_WIDTH;
+
+ return len;
+}
+
static int xc_vm_init(const char *env_len)
{
G.prog.len = xc_vm_envLen(env_len);
-#if ENABLE_FEATURE_EDITING
- G.line_input_state = new_line_input_t(DO_HISTORY);
-#endif
bc_vec_init(&G.files, sizeof(char *), NULL);
xc_program_init();
diff --git a/shell/ash.c b/shell/ash.c
index 87d329f87..f4d296289 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -14177,8 +14177,7 @@ exitshell(void)
char *p;
#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
- if (line_input_state)
- save_history(line_input_state);
+ save_history(line_input_state); /* may be NULL */
#endif
savestatus = exitstatus;
TRACE(("pid %d, exitshell(%d)\n", getpid(), savestatus));
diff --git a/shell/hush.c b/shell/hush.c
index a8f7237d5..f0f0da746 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -2056,8 +2056,7 @@ static sighandler_t pick_sighandler(unsigned sig)
static void hush_exit(int exitcode)
{
#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
- if (G.line_input_state)
- save_history(G.line_input_state);
+ save_history(G.line_input_state); /* may be NULL */
#endif
fflush_all();