| 1 | ## compare_shells: bash dash mksh ash yash
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| 2 | ## oils_failures_allowed: 6
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| 3 |
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| 4 | # NOTE on bash bug: After setting IFS to array, it never splits anymore? Even
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| 5 | # if you assign IFS again.
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| 6 |
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| 7 | #### IFS is scoped
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| 8 | IFS=b
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| 9 | word=abcd
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| 10 | f() { local IFS=c; argv.py $word; }
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| 11 | f
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| 12 | argv.py $word
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| 13 | ## stdout-json: "['ab', 'd']\n['a', 'cd']\n"
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| 14 |
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| 15 | #### Tilde sub is not split, but var sub is
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| 16 | HOME="foo bar"
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| 17 | argv.py ~
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| 18 | argv.py $HOME
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| 19 | ## stdout-json: "['foo bar']\n['foo', 'bar']\n"
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| 20 |
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| 21 | #### Word splitting
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| 22 | a="1 2"
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| 23 | b="3 4"
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| 24 | argv.py $a"$b"
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| 25 | ## stdout-json: "['1', '23 4']\n"
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| 26 |
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| 27 | #### Word splitting 2
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| 28 | a="1 2"
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| 29 | b="3 4"
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| 30 | c="5 6"
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| 31 | d="7 8"
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| 32 | argv.py $a"$b"$c"$d"
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| 33 | ## stdout-json: "['1', '23 45', '67 8']\n"
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| 34 |
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| 35 | # Has tests on differences between $* "$*" $@ "$@"
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| 36 | # http://stackoverflow.com/questions/448407/bash-script-to-receive-and-repass-quoted-parameters
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| 37 |
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| 38 | #### $*
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| 39 | fun() { argv.py -$*-; }
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| 40 | fun "a 1" "b 2" "c 3"
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| 41 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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| 42 |
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| 43 | #### "$*"
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| 44 | fun() { argv.py "-$*-"; }
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| 45 | fun "a 1" "b 2" "c 3"
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| 46 | ## stdout: ['-a 1 b 2 c 3-']
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| 47 |
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| 48 | #### $@
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| 49 | # How does this differ from $* ? I don't think it does.
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| 50 | fun() { argv.py -$@-; }
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| 51 | fun "a 1" "b 2" "c 3"
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| 52 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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| 53 |
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| 54 | #### "$@"
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| 55 | fun() { argv.py "-$@-"; }
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| 56 | fun "a 1" "b 2" "c 3"
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| 57 | ## stdout: ['-a 1', 'b 2', 'c 3-']
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| 58 |
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| 59 | #### empty argv
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| 60 | argv.py 1 "$@" 2 $@ 3 "$*" 4 $* 5
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| 61 | ## stdout: ['1', '2', '3', '', '4', '5']
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| 62 |
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| 63 | #### $* with empty IFS
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| 64 | set -- "1 2" "3 4"
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| 65 |
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| 66 | IFS=
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| 67 | argv.py $*
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| 68 | argv.py "$*"
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| 69 |
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| 70 | ## STDOUT:
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| 71 | ['1 2', '3 4']
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| 72 | ['1 23 4']
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| 73 | ## END
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| 74 |
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| 75 | #### Word elision with space
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| 76 | s1=' '
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| 77 | argv.py $s1
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| 78 | ## stdout: []
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| 79 |
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| 80 | #### Word elision with non-whitespace IFS
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| 81 | # Treated differently than the default IFS. What is the rule here?
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| 82 | IFS='_'
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| 83 | char='_'
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| 84 | space=' '
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| 85 | empty=''
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| 86 | argv.py $char
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| 87 | argv.py $space
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| 88 | argv.py $empty
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| 89 | ## STDOUT:
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| 90 | ['']
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| 91 | [' ']
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| 92 | []
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| 93 | ## END
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| 94 | ## BUG yash STDOUT:
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| 95 | []
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| 96 | [' ']
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| 97 | []
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| 98 | ## END
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| 99 |
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| 100 | #### Leading/trailing word elision with non-whitespace IFS
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| 101 | # This behavior is weird.
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| 102 | IFS=_
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| 103 | s1='_a_b_'
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| 104 | argv.py $s1
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| 105 | ## stdout: ['', 'a', 'b']
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| 106 |
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| 107 | #### Leading ' ' vs leading ' _ '
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| 108 | # This behavior is weird, but all shells agree.
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| 109 | IFS='_ '
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| 110 | s1='_ a b _ '
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| 111 | s2=' a b _ '
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| 112 | argv.py $s1
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| 113 | argv.py $s2
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| 114 | ## STDOUT:
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| 115 | ['', 'a', 'b']
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| 116 | ['a', 'b']
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| 117 | ## END
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| 118 |
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| 119 | #### Multiple non-whitespace IFS chars.
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| 120 | IFS=_-
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| 121 | s1='a__b---c_d'
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| 122 | argv.py $s1
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| 123 | ## stdout: ['a', '', 'b', '', '', 'c', 'd']
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| 124 |
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| 125 | #### IFS with whitespace and non-whitepace.
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| 126 | # NOTE: Three delimiters means two empty words in the middle. No elision.
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| 127 | IFS='_ '
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| 128 | s1='a_b _ _ _ c _d e'
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| 129 | argv.py $s1
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| 130 | ## stdout: ['a', 'b', '', '', 'c', 'd', 'e']
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| 131 |
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| 132 | #### empty $@ and $* is elided
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| 133 | fun() { argv.py 1 $@ $* 2; }
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| 134 | fun
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| 135 | ## stdout: ['1', '2']
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| 136 |
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| 137 | #### unquoted empty arg is elided
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| 138 | empty=""
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| 139 | argv.py 1 $empty 2
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| 140 | ## stdout: ['1', '2']
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| 141 |
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| 142 | #### unquoted whitespace arg is elided
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| 143 | space=" "
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| 144 | argv.py 1 $space 2
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| 145 | ## stdout: ['1', '2']
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| 146 |
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| 147 | #### empty literals are not elided
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| 148 | space=" "
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| 149 | argv.py 1 $space"" 2
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| 150 | ## stdout: ['1', '', '2']
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| 151 |
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| 152 | #### no splitting when IFS is empty
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| 153 | IFS=""
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| 154 | foo="a b"
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| 155 | argv.py $foo
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| 156 | ## stdout: ['a b']
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| 157 |
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| 158 | #### default value can yield multiple words
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| 159 | argv.py 1 ${undefined:-"2 3" "4 5"} 6
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| 160 | ## stdout: ['1', '2 3', '4 5', '6']
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| 161 |
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| 162 | #### default value can yield multiple words with part joining
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| 163 | argv.py 1${undefined:-"2 3" "4 5"}6
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| 164 | ## stdout: ['12 3', '4 56']
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| 165 |
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| 166 | #### default value with unquoted IFS char
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| 167 | IFS=_
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| 168 | argv.py 1${undefined:-"2_3"x_x"4_5"}6
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| 169 | ## stdout: ['12_3x', 'x4_56']
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| 170 |
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| 171 | #### IFS empty doesn't do splitting
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| 172 | IFS=''
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| 173 | x=$(python2 -c 'print(" a b\tc\n")')
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| 174 | argv.py $x
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| 175 | ## STDOUT:
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| 176 | [' a b\tc']
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| 177 | ## END
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| 178 |
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| 179 | #### IFS unset behaves like $' \t\n'
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| 180 | unset IFS
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| 181 | x=$(python2 -c 'print(" a b\tc\n")')
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| 182 | argv.py $x
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| 183 | ## STDOUT:
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| 184 | ['a', 'b', 'c']
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| 185 | ## END
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| 186 |
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| 187 | #### IFS='\'
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| 188 | # NOTE: OSH fails this because of double backslash escaping issue!
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| 189 | IFS='\'
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| 190 | s='a\b'
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| 191 | argv.py $s
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| 192 | ## STDOUT:
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| 193 | ['a', 'b']
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| 194 | ## END
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| 195 |
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| 196 | #### IFS='\ '
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| 197 | # NOTE: OSH fails this because of double backslash escaping issue!
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| 198 | # When IFS is \, then you're no longer using backslash escaping.
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| 199 | IFS='\ '
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| 200 | s='a\b \\ c d\'
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| 201 | argv.py $s
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| 202 | ## STDOUT:
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| 203 | ['a', 'b', '', 'c', 'd']
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| 204 | ## END
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| 205 |
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| 206 | #### IFS characters are glob metacharacters
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| 207 | IFS='* '
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| 208 | s='a*b c'
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| 209 | argv.py $s
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| 210 |
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| 211 | IFS='?'
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| 212 | s='?x?y?z?'
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| 213 | argv.py $s
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| 214 |
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| 215 | IFS='['
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| 216 | s='[x[y[z['
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| 217 | argv.py $s
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| 218 | ## STDOUT:
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| 219 | ['a', 'b', 'c']
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| 220 | ['', 'x', 'y', 'z']
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| 221 | ['', 'x', 'y', 'z']
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| 222 | ## END
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| 223 |
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| 224 | #### Trailing space
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| 225 | argv.py 'Xec ho '
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| 226 | argv.py X'ec ho '
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| 227 | argv.py X"ec ho "
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| 228 | ## STDOUT:
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| 229 | ['Xec ho ']
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| 230 | ['Xec ho ']
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| 231 | ['Xec ho ']
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| 232 | ## END
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| 233 |
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| 234 | #### Empty IFS (regression for bug)
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| 235 | IFS=
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| 236 | echo ["$*"]
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| 237 | set a b c
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| 238 | echo ["$*"]
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| 239 | ## STDOUT:
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| 240 | []
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| 241 | [abc]
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| 242 | ## END
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| 243 |
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| 244 | #### Unset IFS (regression for bug)
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| 245 | set a b c
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| 246 | unset IFS
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| 247 | echo ["$*"]
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| 248 | ## STDOUT:
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| 249 | [a b c]
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| 250 | ## END
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| 251 |
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| 252 | #### IFS=o (regression for bug)
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| 253 | IFS=o
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| 254 | echo hi
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| 255 | ## STDOUT:
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| 256 | hi
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| 257 | ## END
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| 258 |
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| 259 | #### IFS and joining arrays
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| 260 | IFS=:
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| 261 | set -- x 'y z'
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| 262 | argv.py "$@"
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| 263 | argv.py $@
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| 264 | argv.py "$*"
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| 265 | argv.py $*
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| 266 | ## STDOUT:
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| 267 | ['x', 'y z']
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| 268 | ['x', 'y z']
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| 269 | ['x:y z']
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| 270 | ['x', 'y z']
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| 271 | ## END
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| 272 |
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| 273 | #### IFS and joining arrays by assignments
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| 274 | IFS=:
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| 275 | set -- x 'y z'
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| 276 |
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| 277 | s="$@"
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| 278 | argv.py "$s"
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| 279 |
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| 280 | s=$@
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| 281 | argv.py "$s"
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| 282 |
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| 283 | s"$*"
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| 284 | argv.py "$s"
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| 285 |
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| 286 | s=$*
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| 287 | argv.py "$s"
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| 288 |
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| 289 | # bash and mksh agree, but this doesn't really make sense to me.
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| 290 | # In OSH, "$@" is the only real array, so that's why it behaves differently.
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| 291 |
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| 292 | ## STDOUT:
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| 293 | ['x y z']
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| 294 | ['x y z']
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| 295 | ['x y z']
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| 296 | ['x:y z']
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| 297 | ## END
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| 298 | ## BUG dash/ash/yash STDOUT:
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| 299 | ['x:y z']
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| 300 | ['x:y z']
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| 301 | ['x:y z']
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| 302 | ['x:y z']
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| 303 | ## END
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| 304 |
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| 305 |
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| 306 | # TODO:
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| 307 | # - unquoted args of whitespace are not elided (when IFS = null)
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| 308 | # - empty quoted args are kept
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| 309 | #
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| 310 | # - $* $@ with empty IFS
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| 311 | # - $* $@ with custom IFS
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| 312 | #
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| 313 | # - no splitting when IFS is empty
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| 314 | # - word splitting removes leading and trailing whitespace
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| 315 |
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| 316 | # TODO: test framework needs common setup
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| 317 |
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| 318 | # Test IFS and $@ $* on all these
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| 319 | #### TODO
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| 320 | empty=""
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| 321 | space=" "
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| 322 | AB="A B"
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| 323 | X="X"
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| 324 | Yspaces=" Y "
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| 325 |
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| 326 |
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| 327 | #### IFS='' with $@ and $* (bug #627)
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| 328 | set -- a 'b c'
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| 329 | IFS=''
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| 330 | argv.py at $@
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| 331 | argv.py star $*
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| 332 |
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| 333 | # zsh agrees
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| 334 | ## STDOUT:
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| 335 | ['at', 'a', 'b c']
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| 336 | ['star', 'a', 'b c']
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| 337 | ## END
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| 338 |
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| 339 | #### IFS='' with $@ and $* and printf (bug #627)
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| 340 | set -- a 'b c'
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| 341 | IFS=''
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| 342 | printf '[%s]\n' $@
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| 343 | printf '[%s]\n' $*
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| 344 | ## STDOUT:
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| 345 | [a]
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| 346 | [b c]
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| 347 | [a]
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| 348 | [b c]
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| 349 | ## END
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| 350 |
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| 351 | #### IFS='' with ${a[@]} and ${a[*]} (bug #627)
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| 352 | case $SH in dash | ash) exit 0 ;; esac
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| 353 |
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| 354 | myarray=(a 'b c')
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| 355 | IFS=''
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| 356 | argv.py at ${myarray[@]}
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| 357 | argv.py star ${myarray[*]}
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| 358 |
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| 359 | ## STDOUT:
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| 360 | ['at', 'a', 'b c']
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| 361 | ['star', 'a', 'b c']
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| 362 | ## END
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| 363 | ## N-I dash/ash stdout-json: ""
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| 364 |
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| 365 | #### IFS='' with ${!prefix@} and ${!prefix*} (bug #627)
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| 366 | case $SH in dash | mksh | ash | yash) exit 0 ;; esac
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| 367 |
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| 368 | gLwbmGzS_var1=1
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| 369 | gLwbmGzS_var2=2
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| 370 | IFS=''
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| 371 | argv.py at ${!gLwbmGzS_@}
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| 372 | argv.py star ${!gLwbmGzS_*}
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| 373 |
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| 374 | ## STDOUT:
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| 375 | ['at', 'gLwbmGzS_var1', 'gLwbmGzS_var2']
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| 376 | ['star', 'gLwbmGzS_var1', 'gLwbmGzS_var2']
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| 377 | ## END
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| 378 | ## BUG bash STDOUT:
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| 379 | ['at', 'gLwbmGzS_var1', 'gLwbmGzS_var2']
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| 380 | ['star', 'gLwbmGzS_var1gLwbmGzS_var2']
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| 381 | ## END
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| 382 | ## N-I dash/mksh/ash/yash stdout-json: ""
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| 383 |
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| 384 | #### IFS='' with ${!a[@]} and ${!a[*]} (bug #627)
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| 385 | case $SH in dash | mksh | ash | yash) exit 0 ;; esac
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| 386 |
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| 387 | IFS=''
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| 388 | a=(v1 v2 v3)
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| 389 | argv.py at ${!a[@]}
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| 390 | argv.py star ${!a[*]}
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| 391 |
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| 392 | ## STDOUT:
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| 393 | ['at', '0', '1', '2']
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| 394 | ['star', '0', '1', '2']
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| 395 | ## END
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| 396 | ## BUG bash STDOUT:
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| 397 | ['at', '0', '1', '2']
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| 398 | ['star', '0 1 2']
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| 399 | ## END
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| 400 | ## N-I dash/mksh/ash/yash stdout-json: ""
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| 401 |
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| 402 | #### Bug #628 split on : with : in literal word
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| 403 | IFS=':'
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| 404 | word='a:'
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| 405 | argv.py ${word}:b
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| 406 | argv.py ${word}:
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| 407 |
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| 408 | echo ---
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| 409 |
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| 410 | # Same thing happens for 'z'
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| 411 | IFS='z'
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| 412 | word='az'
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| 413 | argv.py ${word}zb
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| 414 | argv.py ${word}z
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| 415 | ## STDOUT:
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| 416 | ['a', ':b']
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| 417 | ['a', ':']
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| 418 | ---
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| 419 | ['a', 'zb']
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| 420 | ['a', 'z']
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| 421 | ## END
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| 422 |
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| 423 | #### Bug #698, similar crash
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| 424 | var='\'
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| 425 | set -f
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| 426 | echo $var
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| 427 | ## STDOUT:
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| 428 | \
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| 429 | ## END
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| 430 |
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| 431 | #### Bug #1664, \\ with noglob
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| 432 |
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| 433 | # Note that we're not changing IFS
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| 434 |
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| 435 | argv.py [\\]_
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| 436 | argv.py "[\\]_"
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| 437 |
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| 438 | # TODO: no difference observed here, go back to original bug
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| 439 |
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| 440 | #argv.py [\\_
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| 441 | #argv.py "[\\_"
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| 442 |
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| 443 | echo noglob
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| 444 |
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| 445 | # repeat cases with -f, noglob
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| 446 | set -f
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| 447 |
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| 448 | argv.py [\\]_
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| 449 | argv.py "[\\]_"
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| 450 |
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| 451 | #argv.py [\\_
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| 452 | #argv.py "[\\_"
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| 453 |
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| 454 | ## STDOUT:
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| 455 | ['[\\]_']
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| 456 | ['[\\]_']
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| 457 | noglob
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| 458 | ['[\\]_']
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| 459 | ['[\\]_']
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| 460 | ## END
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| 461 |
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| 462 |
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| 463 | #### Empty IFS bug #2141 (from pnut)
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| 464 |
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| 465 | res=0
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| 466 | sum() {
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| 467 | # implement callee-save calling convention using `set`
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| 468 | # here, we save the value of $res after the function parameters
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| 469 | set $@ $res # $1 $2 $3 are now set
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| 470 | res=$(($1 + $2))
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| 471 | echo "$1 + $2 = $res"
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| 472 | res=$3 # restore the value of $res
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| 473 | }
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| 474 |
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| 475 | unset IFS
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| 476 | sum 12 30 # outputs "12 + 30 = 42"
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| 477 |
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| 478 | IFS=' '
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| 479 | sum 12 30 # outputs "12 + 30 = 42"
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| 480 |
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| 481 | IFS=
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| 482 | sum 12 30 # outputs "1230 + 0 = 1230"
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| 483 |
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| 484 | # I added this
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| 485 | IFS=''
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| 486 | sum 12 30
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| 487 |
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| 488 | set -u
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| 489 | IFS=
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| 490 | sum 12 30 # fails with "fatal: Undefined variable '2'" on res=$(($1 + $2))
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| 491 |
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| 492 | ## STDOUT:
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| 493 | 12 + 30 = 42
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| 494 | 12 + 30 = 42
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| 495 | 12 + 30 = 42
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| 496 | 12 + 30 = 42
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| 497 | 12 + 30 = 42
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| 498 | ## END
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| 499 |
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| 500 | #### Unicode in IFS
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| 501 |
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| 502 | # bash, zsh, and yash support unicode in IFS, but dash/mksh/ash don't.
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| 503 |
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| 504 | # for zsh, though we're not testing it here
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| 505 | setopt SH_WORD_SPLIT
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| 506 |
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| 507 | x=çx IFS=ç
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| 508 | printf "<%s>\n" $x
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| 509 |
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| 510 | ## STDOUT:
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| 511 | <>
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| 512 | <x>
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| 513 | ## END
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| 514 |
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| 515 | ## BUG dash/mksh/ash STDOUT:
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| 516 | <>
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| 517 | <>
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| 518 | <x>
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| 519 | ## END
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| 520 |
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| 521 | #### 4 x 3 table: (default IFS, IFS='', IFS=zx) x ( $* "$*" $@ "$@" )
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| 522 |
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| 523 | set -- 'a b' c
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| 524 |
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| 525 | argv.py ' $* ' $*
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| 526 | argv.py ' "$*" ' "$*"
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| 527 | argv.py ' $@ ' $@
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| 528 | argv.py ' "$@" ' "$@"
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| 529 | echo
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| 530 |
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| 531 | IFS=''
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| 532 | argv.py ' $* ' $*
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| 533 | argv.py ' "$*" ' "$*"
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| 534 | argv.py ' $@ ' $@
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| 535 | argv.py ' "$@" ' "$@"
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| 536 | echo
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| 537 |
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| 538 | IFS=zx
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| 539 | argv.py ' $* ' $*
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| 540 | argv.py ' "$*" ' "$*"
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| 541 | argv.py ' $@ ' $@
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| 542 | argv.py ' "$@" ' "$@"
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| 543 |
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| 544 | ## STDOUT:
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| 545 | [' $* ', 'a', 'b', 'c']
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| 546 | [' "$*" ', 'a b c']
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| 547 | [' $@ ', 'a', 'b', 'c']
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| 548 | [' "$@" ', 'a b', 'c']
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| 549 |
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| 550 | [' $* ', 'a b', 'c']
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| 551 | [' "$*" ', 'a bc']
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| 552 | [' $@ ', 'a b', 'c']
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| 553 | [' "$@" ', 'a b', 'c']
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| 554 |
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| 555 | [' $* ', 'a b', 'c']
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| 556 | [' "$*" ', 'a bzc']
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| 557 | [' $@ ', 'a b', 'c']
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| 558 | [' "$@" ', 'a b', 'c']
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| 559 | ## END
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