CVS commit: src/bin/sh

Module Name:	src
Committed By:	kre
Date:		Tue Aug  4 22:58:28 UTC 2026

Modified Files:
	src/bin/sh: trap.c trap.h

Log Message:
/bin/sh - trap.c - new func and avoid lost memory

Add run_traps() - which is just dotrap() except that it
preserves the state of the stack around the trap executions,
so is safe to call with the stack in any state.   It will also
preserve the state of the growing string at the top of the
stack if informed (by giving a non-zero value as its arg)
that such a string currently exists.   This new function does
not exist in SMALL shells.

While here, fix an unlikely memory leak - if a shell error
(not command error) occurs while processing a trap in dotrap()
the copy of the trap string being parsed can be lost.  This is
irrelevant in non-interactive shells, as the errors which would
cause this loss, also cause a non-interactive shell to exit,
the lost memory is only lost for a very short time.   Interactive
shells rarely set traps (except possibly an EXIT trap - for which
the memory loss is also immaterial for almost the same reason) at
all, and if one were set, and generated a shell error (typically
a parsing error) that is only likely to happen once, before being
corrected, so the memory loss would be negligible.   Nevertheless
that is now avoided.


To generate a diff of this commit:
cvs rdiff -u -r1.63 -r1.64 src/bin/sh/trap.c
cvs rdiff -u -r1.26 -r1.27 src/bin/sh/trap.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.