Date: Tue, 28 Dec 2010 14:58:08 +0000 (UTC) From: Jilles Tjoelker <jilles@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r216763 - head/tools/regression/bin/sh/expansion Message-ID: <201012281458.oBSEw8Tb065177@svn.freebsd.org>
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Author: jilles Date: Tue Dec 28 14:58:08 2010 New Revision: 216763 URL: http://svn.freebsd.org/changeset/base/216763 Log: 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. Added: head/tools/regression/bin/sh/expansion/cmdsubst6.0 (contents, props changed) Added: head/tools/regression/bin/sh/expansion/cmdsubst6.0 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/tools/regression/bin/sh/expansion/cmdsubst6.0 Tue Dec 28 14:58:08 2010 (r216763) @@ -0,0 +1,53 @@ +# $FreeBSD$ +# This tests if the cmdsubst optimization is still used if possible. + +failures='' +ok='' + +testcase() { + code="$1" + + unset v + eval "pid=\$(dummy=$code echo \$(\$SH -c echo\ \\\$PPID))" + + if [ "$pid" = "$$" ]; then + ok=x$ok + else + failures=x$failures + echo "Failure for $code" + fi +} + +unset v +w=1 +testcase '$w' +testcase '1${w+1}' +testcase '1${w-1}' +testcase '1${v+1}' +testcase '1${v-1}' +testcase '1${w:+1}' +testcase '1${w:-1}' +testcase '1${v:+1}' +testcase '1${v:-1}' +testcase '${w?}' +testcase '${w:?}' +testcase '${w#x}' +testcase '${w##x}' +testcase '${w%x}' +testcase '${w%%x}' + +testcase '$((w))' +testcase '$(((w+4)*2/3))' +testcase '$((w==1))' +testcase '$((w>=0 && w<=5 && w!=2))' +testcase '$((${#w}))' +testcase '$((${#IFS}))' +testcase '$((${#w}>=1))' +testcase '$(($$))' +testcase '$(($#))' +testcase '$(($?))' + +testcase '$(: $((w=4)))' +testcase '$(: ${v=2})' + +test "x$failures" = x
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