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ash: parser: Save and restore heredoclist in expandstr

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Upstream commit:

    Date: Sun, 17 May 2020 23:36:25 +1000
    parser: Save and restore heredoclist in expandstr

    On Sun, May 17, 2020 at 01:19:28PM +0100, Harald van Dijk wrote:
    > This still does not restore the state completely. It does not clean up any
    > pending heredocs. I see:
    >
    >   $ PS1='$(<<EOF "'
    >   src/dash: 1: Syntax error: Unterminated quoted string
    >   $(<<EOF ":
    >   >
    >
    > That is, after entering the ':' command, the shell is still trying to read
    > the heredoc from the prompt.

    This patch saves and restores the heredoclist in expandstr.

    It also removes a bunch of unnecessary volatiles as those variables
    are only referenced in case of a longjmp other than one started by
    a signal like SIGINT.

function                                             old     new   delta
expandstr                                            268     255     -13

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-09-08 00:56:53 +02:00
parent 30af5938af
commit 1c06ddd8bb
1 changed files with 11 additions and 8 deletions
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19
shell/ash.c
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@ -13359,23 +13359,26 @@ parseheredoc(void)
static const char *
expandstr(const char *ps, int syntax_type)
{
union node n;
struct parsefile *file_stop;
struct jmploc *volatile savehandler;
struct heredoc *saveheredoclist;
const char *result;
int saveprompt;
struct parsefile *file_stop = g_parsefile;
volatile int saveint;
struct jmploc *volatile savehandler = exception_handler;
struct jmploc jmploc;
const char *volatile result;
union node n;
int err;
file_stop = g_parsefile;
/* XXX Fix (char *) cast. */
setinputstring((char *)ps);
saveheredoclist = heredoclist;
heredoclist = NULL;
saveprompt = doprompt;
doprompt = 0;
result = ps;
SAVE_INT(saveint);
savehandler = exception_handler;
err = setjmp(jmploc.loc);
if (err)
goto out;
@ -13402,11 +13405,11 @@ out:
exception_handler = savehandler;
if (err && exception_type != EXERROR)
longjmp(exception_handler->loc, 1);
RESTORE_INT(saveint);
doprompt = saveprompt;
/* Try: PS1='`xxx(`' */
unwindfiles(file_stop);
heredoclist = saveheredoclist;
return result;
}