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hush: revert "make interactive ^C break out of PS2 mode"

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It made ^C break out of the entire shell, if we aren't in PS2 mode.
Need a better idea.

function                                             old     new   delta
expand_one_var                                      2344    2353      +9
syntax_error_unterm_ch                                21      29      +8
parse_dollar                                         817     824      +7
parse_stream                                        2251    2238     -13
fgetc_interactive                                    249     227     -22
syntax_error_unterm_str                               26       -     -26
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 3/2 up/down: 24/-61)            Total: -37 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-12-23 23:01:18 +01:00
parent 649acb9e23
commit 18bcaf374c
1 changed files with 3 additions and 22 deletions
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25
shell/hush.c
View File

@ -916,9 +916,6 @@ struct globals {
char opt_c;
#if ENABLE_HUSH_INTERACTIVE
smallint promptmode; /* 0: PS1, 1: PS2 */
# if ENABLE_FEATURE_EDITING
smallint flag_ctrlC; /* when set, suppresses syntax error messages */
# endif
#endif
smallint flag_SIGINT;
#if ENABLE_HUSH_LOOPS
@ -1428,10 +1425,7 @@ static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
{
#if ENABLE_FEATURE_EDITING
if (!G.flag_ctrlC)
#endif
bb_error_msg("syntax error: unterminated %s", s);
bb_error_msg("syntax error: unterminated %s", s);
//? source4.tests fails: in bash, echo ${^} in script does not terminate the script
// die_if_script();
}
@ -2642,19 +2636,15 @@ static int get_user_input(struct in_str *i)
);
/* read_line_input intercepts ^C, "convert" it to SIGINT */
if (r == 0) {
G.flag_ctrlC = 1;
raise(SIGINT);
}
check_and_run_traps();
if (r != 0 && !G.flag_SIGINT)
break;
/* ^C or SIGINT: return EOF */
/* ^C or SIGINT: repeat */
/* bash prints ^C even on real SIGINT (non-kbd generated) */
write(STDOUT_FILENO, "^C\n", 3);
G.last_exitcode = 128 | SIGINT;
i->p = NULL;
i->peek_buf[0] = r = EOF;
return r;
}
if (r < 0) {
/* EOF/error detected */
@ -5266,16 +5256,7 @@ static struct pipe *parse_stream(char **pstring,
ch, ch, !!(ctx.word.o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
if (ch == EOF) {
struct pipe *pi;
#if ENABLE_FEATURE_EDITING
if (G.flag_ctrlC) {
/* testcase: interactively entering
* 'qwe <cr> ^C
* should not leave input in PS2 mode, waiting to close single quote.
*/
G.flag_ctrlC = 0;
goto parse_error;
}
#endif
if (heredoc_cnt) {
syntax_error_unterm_str("here document");
goto parse_error_exitcode1;