CVS commit: src/bin/sh

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

Module Name:    src
Committed By:   kre
Date:           Fri Jul 12 08:35:48 UTC 2024

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

Log Message:
Implement expandvar() : runs var/arith/cmdsub expansions on var value

expandvar() is like expandenv() and expandstr() - each expands
variable values in different contexts, expandenv() when processing
environment vars at startup (and there is no existing state to lose),
but is always using unsafe data, so never runs command substitutions,
expandstr() while in the middle of processing commands (mostly to
expand the prompt variables, so there is probably half a command
tree in the process of being built) - it uses the promptcmds option
to decide whether to run command substitutions.  expandvar() is for
intermediate situations, where a variable is to be used during
processing.  It will run command substitutions if the variable
value concerned was not imported from the environment.

There are currently no uses of expandvar(), so this change alters
nothing in the shell - but there will be in the near future.


To generate a diff of this commit:
cvs rdiff -u -r1.181 -r1.182 src/bin/sh/parser.c
cvs rdiff -u -r1.28 -r1.29 src/bin/sh/parser.h

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