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| author | Ron Yorston | 2019-04-18 09:48:13 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2019-04-19 13:21:34 +0200 |
| commit | 48645b83502a5add5429b6cbb19cf3a083f1adf4 (patch) | |
| tree | 87a59484fb86b2589de1b3f14b0d102c2d7f8a38 | |
| parent | 32c8ce4def177a98a9aef0896bdb2d8262b364ec (diff) | |
| download | busybox-48645b83502a5add5429b6cbb19cf3a083f1adf4.zip busybox-48645b83502a5add5429b6cbb19cf3a083f1adf4.tar.gz | |
ash: prevent error in backquotes in PS1 from exiting shell
Setting PS1 to:
PS1='`xxx(`'
causes the shell to terminate with the error:
sh: syntax error: unexpected end of file (expecting ")")
This happens because old-style backquotes require the input to be reread
and thus call setinputstring() a second time. Prevent the problem by
unwinding all recently opened files in expandstr().
function old new delta
unwindfiles - 22 +22
expandstr 247 262 +15
forkchild 631 625 -6
evalcommand 1694 1685 -9
ash_main 1346 1336 -10
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/3 up/down: 37/-25) Total: 12 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | shell/ash.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/shell/ash.c b/shell/ash.c index b707d00..f3a2c69 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -13042,6 +13042,7 @@ expandstr(const char *ps, int syntax_type) { union node n; int saveprompt; + struct parsefile *file_stop = g_parsefile; /* XXX Fix (char *) cast. */ setinputstring((char *)ps); @@ -13068,7 +13069,8 @@ expandstr(const char *ps, int syntax_type) doprompt = saveprompt; - popfile(); + /* Try: PS1='`xxx(`' */ + unwindfiles(file_stop); n.narg.type = NARG; n.narg.next = NULL; |