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Backport ksh93v- bugfix for [[ 1<2 ]] (#380)

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Strings compared in [[ with the > and < operators should be compared
lexically. This does not work when the strings are single digits, as
the parser interprets it as a syntax error:
   $ [[ 10<2 ]]   # 10 lexically sorts before 2
   $ echo $?
   0
   $ [[ 1<2 ]]
   /usr/bin/ksh: syntax error: `<' unexpected
   $ echo $?
   3

src/cmd/ksh93/sh/lex.c:
- Don't interpret numbers next to > and < as a redirection while
  inside of [[. This bugfix was backported from ksh93v- 2014-06-25.

src/cmd/ksh93/tests/bracket.sh:
- Add regression tests for the > and < operators.
This commit is contained in:
Johnothan King 2021-12-16 18:24:56 -08:00 committed by Martijn Dekker
parent e67df29c07
commit 85199ab351
3 changed files with 58 additions and 1 deletions
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3
NEWS
View file

@ -10,6 +10,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
a subshell. Types can now safely be defined in subshells and defined
conditionally as in 'if condition; then enum ...; fi'.
- Single digits can now be compared lexically in [[ ... ]] with the
< and > operators.
2021-12-16:
- Changed the default selection of compiled-in /opt/ast/bin built-in libcmd

2
src/cmd/ksh93/sh/lex.c
View file

@ -1264,7 +1264,7 @@ breakloop:
{
/* check for numbered redirection */
n = state[0];
if((c=='<' || c=='>') && isadigit(n))
if(!lp->lex.intest && (c=='<' || c=='>') && isadigit(n))
{
c = sh_lex(lp);
lp->digits = (n-'0');

54
src/cmd/ksh93/tests/bracket.sh
View file

@ -461,5 +461,59 @@ do e=${c%%:*}
(($?==e)) || err_exit "test \( $c \) not working"
done
# ======
# [[ ... ]] shouldn't error out when using '>' and '<' with or without a
# space in between strings (including when a number is handled as a string).
exp=0
$SHELL -c '[[ 3>2 ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle '3>2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 3 > 2 ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle '3 > 2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 1<2 ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle '1<2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 1 < 2 ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle '1 < 2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ a<b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'a<b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ a < b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'a < b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ c>b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'c>b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ c > b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'c > b'" \
"(expected $exp, got $got)"
exp=1
$SHELL -c '[[ 3<2 ]]' || got=$?
((exp == got )) || err_exit "[[ ... ]] cannot handle '3<2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 3 < 2 ]]' || got=$?
((exp == got )) || err_exit "[[ ... ]] cannot handle '3 < 2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 1>2 ]]'; got=$?
((exp == got )) || err_exit "[[ ... ]] cannot handle '1>2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ 1 > 2 ]]'; got=$?
((exp == got )) || err_exit "[[ ... ]] cannot handle '1 > 2'" \
"(expected $exp, got $got)"
$SHELL -c '[[ a>b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'a>b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ a > b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'a > b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ c<b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'c<b'" \
"(expected $exp, got $got)"
$SHELL -c '[[ c < b ]]'; got=$?
((exp == got)) || err_exit "[[ ... ]] cannot handle 'c < b'" \
"(expected $exp, got $got)"
# ======
exit $((Errors<125?Errors:125))