99 lines
4.1 KiB
Bash
99 lines
4.1 KiB
Bash
#!/bin/sh
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# The standard
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# http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
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# explains (section 2.6) that Field splitting should be performed on the
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# result of variable expansions.
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# In particular this means that in ${x-word}, 'word' must be expanded as if
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# the "${x-" and "}" were absent from the input line.
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#
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# So: sh -c 'set ${x-a b c}; echo $#' should give 3.
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#
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rval=0
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exec >&2
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nl='
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'
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OIFS="$IFS"
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check()
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{
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result="$(eval $1)"
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# Remove newlines
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IFS="$nl"
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result="$(echo $result)"
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IFS="$OIFS"
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if [ "$2" != "$result" ]
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then
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echo "command: $1"
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echo " expected [$2], found [$result]"
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rval=1
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fi
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}
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unset x
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# Since I managed to break this, leave the test in
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check 'for f in $x; do echo x${f}y; done' ''
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# Check that IFS is applied to text from ${x-...} unless it is inside
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# any set of "..."
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check 'set ${x-a b c}; echo $#' 3
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check 'for i in ${x-a b c}; do echo "z${i}z"; done' 'zaz zbz zcz'
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check 'for i in ${x-"a b" c}; do echo "z${i}z"; done' 'za bz zcz'
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check 'for i in ${x-"a ${x-b c}" d}; do echo "z${i}z"; done' 'za b cz zdz'
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check 'for i in ${x-"a ${x-"b c"}" d}; do echo "z${i}z"; done' 'za b cz zdz'
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check 'for i in ${x-a ${x-"b c"} d}; do echo "z${i}z"; done' 'zaz zb cz zdz'
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check 'for i in ${x-a ${x-b c} d}; do echo "z${i}z"; done' 'zaz zbz zcz zdz'
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# repeat with an alphabetic in IFS
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check 'IFS=q; set ${x-aqbqc}; echo $#' 3
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check 'IFS=q; for i in ${x-aqbqc}; do echo "z${i}z"; done' 'zaz zbz zcz'
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check 'IFS=q; for i in ${x-"aqb"qc}; do echo "z${i}z"; done' 'zaqbz zcz'
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check 'IFS=q; for i in ${x-"aq${x-bqc}"qd}; do echo "z${i}z"; done' 'zaqbqcz zdz'
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check 'IFS=q; for i in ${x-"aq${x-"bqc"}"qd}; do echo "z${i}z"; done' 'zaqbqcz zdz'
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check 'IFS=q; for i in ${x-aq${x-"bqc"}qd}; do echo "z${i}z"; done' 'zaz zbqcz zdz'
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# Some quote propogation checks
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check 'set "${x-a b c}"; echo $#' 1
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check 'set "${x-"a b" c}"; echo $1' 'a b c'
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check 'for i in "${x-a b c}"; do echo "z${i}z"; done' 'za b cz'
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# Check we get "$@" right
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check 'set ""; for i; do echo "z${i}z"; done' 'zz'
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check 'set ""; for i in "$@"; do echo "z${i}z"; done' 'zz'
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check 'set "" ""; for i; do echo "z${i}z"; done' 'zz zz'
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check 'set "" ""; for i in "$@"; do echo "z${i}z"; done' 'zz zz'
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check 'set "" ""; for i in $@; do echo "z${i}z"; done' ''
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check 'set "a b" c; for i; do echo "z${i}z"; done' 'za bz zcz'
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check 'set "a b" c; for i in "$@"; do echo "z${i}z"; done' 'za bz zcz'
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check 'set "a b" c; for i in $@; do echo "z${i}z"; done' 'zaz zbz zcz'
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check 'set " a b " c; for i in "$@"; do echo "z${i}z"; done' 'z a b z zcz'
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check 'set --; for i in x"$@"x; do echo "z${i}z"; done' 'zxxz'
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check 'set a; for i in x"$@"x; do echo "z${i}z"; done' 'zxaxz'
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check 'set a b; for i in x"$@"x; do echo "z${i}z"; done' 'zxaz zbxz'
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# Some IFS tests
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check 't="-- "; IFS=" "; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '0'
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check 't=" x"; IFS=" x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '1'
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check 't=" x "; IFS=" x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '1'
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check 't=axb; IFS="x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '2 a:b'
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check 't="a x b"; IFS="x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '2 a : b'
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check 't="a xx b"; IFS="x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '3 a :: b'
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check 't="a xx b"; IFS="x "; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '3 a::b'
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# A recent 'clarification' means that a single trailing IFS non-whitespace
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# doesn't generate an empty parameter
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check 't="xax"; IFS="x"; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '2 :a'
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check 't="xax "; IFS="x "; set $t; IFS=":"; r="$*"; IFS=; echo $# $r' '2 :a'
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# Verify that IFS isn't being applied where it shouldn't be.
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check 'IFS="x"; set axb; IFS=":"; r="$*"; IFS=; echo $# $r' '1 axb'
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# Check that we apply IFS to ${#var}
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long=12345678123456781234567812345678
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long=$long$long$long$long
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check 'echo ${#long}; IFS=2; echo ${#long}; set 1 ${#long};echo $#' '128 1 8 3'
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check 'IFS=2; set ${x-${#long}}; IFS=" "; echo $* $#' '1 8 2'
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check 'IFS=2; set ${x-"${#long}"}; IFS=" "; echo $* $#' '128 1'
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exit $rval
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