PR/56972 CVS commit: src/bin/sh

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

The following reply was made to PR bin/56972; it has been noted by GNATS.

From: "Robert Elz" <kre%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/56972 CVS commit: src/bin/sh
Date: Fri, 19 Aug 2022 12:17:18 +0000

 Module Name:	src
 Committed By:	kre
 Date:		Fri Aug 19 12:17:18 UTC 2022
 
 Modified Files:
 	src/bin/sh: miscbltin.c
 
 Log Message:
 PR bin/56972  Fix escape ('\') handling in sh read builtin.
 
 In 1.35 (March 2005) (the big read fixup), most escape handling and IFS
 processing in the read builtin was corrected.  However 2 cases were missed,
 one is a word (something to be assigned to any variable but the last) in
 which every character is escaped (the code was relying on a non-escaped char
 to set the "in a word" status), and second trailing IFS whitespace at
 the end of the line was being deleted, even if the chars had been escaped
 (the escape chars are no longer present).
 
 See the PR for more details (including the case that detected the problem).
 
 After fixing this, I looked at the FreeBSD code (normally might do it
 before, but these fixes were trivial) to check their implementation.
 Their code does similar things to ours now does, but in a completely
 different way, their read builtin is more complex than ours needs to
 be (they handle more options).   For anyone tempted to simply incorporate
 their code, note that it relies upon infrastructure changes elsewhere
 in the shell, so would not be a simple cut and drop in exercise.
 
 This needs pullups to -3 -4 -5 -6 -7 -8 and -9 (fortunately this is
 happening before -10 is branched, so will never be broken this way there).
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.50 -r1.51 src/bin/sh/miscbltin.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.