CVS commit: src/bin/sh

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Mon Feb  4 11:16:41 UTC 2019

Modified Files:
        src/bin/sh: error.c error.h eval.c eval.h main.c parser.c sh.1

Log Message:
PR bin/53919

Suppress shell error messages while expanding $ENV (which also causes
errors while expanding $PS1 $PS2 and $PS4 to be suppressed as well).

This allows any random garbage that happens to be in ENV to not
cause noise when the shell starts (which is effectively all it did).

On a parse error (for any of those vars) we also use "" as the result,
which will be a null prompt, and avoid attempting to open any file for ENV.

This does not in any way change what happens for a correctly parsed command
substitution (either when it is executed when permitted for one of the
prompts, or when it is not (which is always for ENV)) and commands run
from those can still produce error output (but shell errors remain suppressed).


To generate a diff of this commit:
cvs rdiff -u -r1.42 -r1.43 src/bin/sh/error.c
cvs rdiff -u -r1.21 -r1.22 src/bin/sh/error.h
cvs rdiff -u -r1.170 -r1.171 src/bin/sh/eval.c
cvs rdiff -u -r1.22 -r1.23 src/bin/sh/eval.h
cvs rdiff -u -r1.80 -r1.81 src/bin/sh/main.c
cvs rdiff -u -r1.164 -r1.165 src/bin/sh/parser.c
cvs rdiff -u -r1.217 -r1.218 src/bin/sh/sh.1

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