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Fix ${x=y} and ${x:=y} for numeric types of x

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These POSIX expansions first assign y to x if x is unset or empty,
respectively, and then they yield the value of x. This was not
working on any ksh93 version if x was typeset as numeric (integer
or float) but still unset, as in not assigned a value.

$ unset a; typeset -i a; printf '%q\n' "${a:=42}" "$a"
0
''

Expected output:
42
42

src/cmd/ksh93/sh/macro.c:
- Fix the test for set/unset variable. It was broken because it
  only checked for the existence of the node, which exists after
  'typeset', but did not check if a value had been assigned. This
  additional check needs to be done with the nv_isnull() macro, but
  only for expansions of the regular M_BRACE type. Special
  expansions cannot have an unset state.
- As of commit 95294419, we know that an nv_optimize() call may be
  needed before using nv_isnull() if the shell is compiled with
  SHOPT_OPTIMIZE. Move the nv_optimize() call from that commit
  forward to before the new check that calls nv_isnull(), and only
  bother with it if the type is M_BRACE.

src/cmd/ksh93/tests/variables.sh:
- Add tests for this bug. Test float and integer, and also check
  that ${a=b} and ${a:=b} correctly treat the value of 'b' as an
  arithmetic expression of which the result is assigned to 'a' if
  'a' was typeset as numeric.

src/cmd/ksh93/tests/attributes.sh,
src/cmd/ksh93/tests/comvar.sh,
src/cmd/ksh93/tests/nameref.sh,
src/cmd/ksh93/tests/types.sh:
- Fix a number of tests to report failures correctly.

Resolves: https://github.com/ksh93/ksh/issues/157
This commit is contained in:
Martijn Dekker 2021-03-06 03:56:52 +00:00
parent f8f2c4b608
commit 9f2389ed93
8 changed files with 60 additions and 19 deletions
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@ -3,6 +3,12 @@ For full details, see the git log at: https://github.com/ksh93/ksh
Any uppercase BUG_* names are modernish shell bug IDs.
2021-03-06:
- Fixed an old expansion bug: expansions of type ${var=value} and ${var:=value}
did not perform an assignment and yielded the value 0 if 'var' was typeset as
numeric (integer or float) but had not yet been assigned a value.
2021-03-05:
- Unbalanced quotes and backticks now correctly produce a syntax error