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hush: if !EDITING, do not regenerate prompt for every input char

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function                                             old     new   delta
fgetc_interactive                                    261     258      -3
pseudo_exec_argv                                     406     399      -7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-10)             Total: -10 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-12-25 18:49:29 +01:00
parent 6cfec7dd02
commit 46a71dc30c
1 changed files with 12 additions and 5 deletions
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17
shell/hush.c
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@ -2640,11 +2640,14 @@ static const char *setup_prompt_string(void)
}
static int get_user_input(struct in_str *i)
{
# if ENABLE_FEATURE_EDITING
/* In EDITING case, this function reads next input line,
* saves it in i->p, then returns 1st char of it.
*/
int r;
const char *prompt_str;
prompt_str = setup_prompt_string();
# if ENABLE_FEATURE_EDITING
for (;;) {
reinit_unicode_for_hush();
G.flag_SIGINT = 0;
@ -2674,9 +2677,15 @@ static int get_user_input(struct in_str *i)
i->p = G.user_input_buf;
return (unsigned char)*i->p++;
# else
/* In !EDITING case, this function gets called for every char.
* Buffering happens deeper in the call chain, in hfgetc(i->file).
*/
int r;
for (;;) {
G.flag_SIGINT = 0;
if (i->last_char == '\0' || i->last_char == '\n') {
const char *prompt_str = setup_prompt_string();
/* Why check_and_run_traps here? Try this interactively:
* $ trap 'echo INT' INT; (sleep 2; kill -INT $$) &
* $ <[enter], repeatedly...>
@ -8171,7 +8180,6 @@ static void exec_function(char ***to_free,
/* On MMU, funcp->body is always non-NULL */
n = run_list(funcp->body);
fflush_all();
_exit(n);
# else
//? close_saved_fds_and_FILE_fds();
@ -8246,7 +8254,6 @@ static void exec_builtin(char ***to_free,
{
#if BB_MMU
int rcode;
fflush_all();
//? close_saved_fds_and_FILE_fds();
rcode = x->b_function(argv);
fflush_all();
@ -10039,8 +10046,8 @@ int hush_main(int argc, char **argv)
#endif
cached_getpid = getpid(); /* for tcsetpgrp() during init */
G.root_pid = cached_getpid; /* for $PID (NOMMU can override via -$HEXPID:HEXPPID:...) */
G.root_ppid = getppid(); /* for $$PPID (NOMMU can override) */
G.root_pid = cached_getpid; /* for $PID (NOMMU can override via -$HEXPID:HEXPPID:...) */
G.root_ppid = getppid(); /* for $PPID (NOMMU can override) */
/* Deal with HUSH_VERSION */
debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");