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set --default: properly restore ksh IFS behaviour (re: 9e2a8c69)

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Reproducer:

$ (IFS=$'\t\t'; val=$'\tone\t\ttwo\t'; set --posix; \
   set -- $val; echo $#; set --noposix; set -- $val; echo $#)
2
4   <== OK

$ (IFS=$'\t\t'; val=$'\tone\t\ttwo\t'; set --posix; \
   set -- $val; echo $#; set --default; set -- $val; echo $#)
2
2   <== bug

The output of the seconnd command line should be like the first.

When POSIX mode is turned off using 'set --noposix' (or 'set +o
posix'), sh.ifstable is invalidated as it needs to be repopulated
on the next field split to restore ksh-specific special handling of
a repeated $IFS whitespace character as non-whitespace. However,
when 'set --default' is used, this does not happen, which is a bug.

src/cmd/ksh93/sh/args.c: sh_argopts():
- While processing --default, when turning off SH_POSIX, call
  sh_invalidate_ifs() to invalidate sh.ifstable.
This commit is contained in:
Martijn Dekker 2022-05-28 00:02:46 +01:00
parent 83baa27ef9
commit 8f14514661
4 changed files with 16 additions and 1 deletions
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2
src/cmd/ksh93/include/version.h
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@ -21,7 +21,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2022-05-25" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2022-05-27" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2022 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */