sh: Add test for optimized command substitution.
This test verifies that certain expansions without side effects do not cause the command substitution to be executed in a child process. This is not a correctness requirement, but it involves a nontrivial amount of code and it would be unfortunate if it stopped working.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=216763
53
tools/regression/bin/sh/expansion/cmdsubst6.0
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53
tools/regression/bin/sh/expansion/cmdsubst6.0
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# $FreeBSD$
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# This tests if the cmdsubst optimization is still used if possible.
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failures=''
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ok=''
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testcase() {
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code="$1"
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unset v
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eval "pid=\$(dummy=$code echo \$(\$SH -c echo\ \\\$PPID))"
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if [ "$pid" = "$$" ]; then
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ok=x$ok
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else
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failures=x$failures
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echo "Failure for $code"
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fi
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}
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unset v
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w=1
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testcase '$w'
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testcase '1${w+1}'
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testcase '1${w-1}'
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testcase '1${v+1}'
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testcase '1${v-1}'
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testcase '1${w:+1}'
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testcase '1${w:-1}'
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testcase '1${v:+1}'
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testcase '1${v:-1}'
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testcase '${w?}'
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testcase '${w:?}'
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testcase '${w#x}'
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testcase '${w##x}'
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testcase '${w%x}'
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testcase '${w%%x}'
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testcase '$((w))'
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testcase '$(((w+4)*2/3))'
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testcase '$((w==1))'
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testcase '$((w>=0 && w<=5 && w!=2))'
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testcase '$((${#w}))'
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testcase '$((${#IFS}))'
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testcase '$((${#w}>=1))'
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testcase '$(($$))'
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testcase '$(($#))'
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testcase '$(($?))'
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testcase '$(: $((w=4)))'
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testcase '$(: ${v=2})'
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test "x$failures" = x
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