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ash: allow "trap NUM [SIG]..." syntax

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While at it, make get_signum() return -1 for numeric strings >= NSIG.

function                                             old     new   delta
trapcmd                                              292     306     +14
get_signum                                           295     300      +5
builtin_trap                                         413     412      -1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 19/-1)              Total: 18 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2017-07-25 20:06:17 +02:00
parent f1a5cb0548
commit 86981e3ad2
4 changed files with 10 additions and 5 deletions
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9
shell/ash.c
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@@ -12981,13 +12981,18 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
return 0;
}
/* Why the second check?
* "trap NUM [sig2]..." is the same as "trap - NUM [sig2]..."
* In this case, NUM is signal no, not an action.
*/
action = NULL;
if (ap[1])
if (ap[1] && !is_number(ap[0]))
action = *ap++;
exitcode = 0;
while (*ap) {
signo = get_signum(*ap);
if (signo < 0 || signo >= NSIG) {
if (signo < 0) {
/* Mimic bash message exactly */
ash_msg("%s: invalid signal specification", *ap);
exitcode = 1;