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Port illumos' shell linter improvements (#353)

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This commit ports over two improvements to the shell linter from
illumos (original patch written by Andy Fiddaman). Links to the
relevant bug reports and the original patch:
https://www.illumos.org/issues/13601
https://www.illumos.org/issues/13631
c7b656fc71

The first improvement is to the lint warning for arithmetic
operators in [[ ... ]]. The ksh linter now suggests the correct
equivalent operator to use in ((...)). Example:
  $ ksh -nc '[[ 30 -gt 25 ]]'
  # Original warning
  warning: line 1: -gt within [[ ... ]] obsolete, use ((...))
  # New warning
  warning: line 1: [[ ... -gt ... ]] obsolete, use ((... > ...))

The second improvement pertains to variable expansion in arithmetic
expressions. The ksh linter now suggests referencing variable names
directly:
  $ ksh -nc 'integer foo=40; (($foo < 50 ))'
  # Old warning
  warning: line 1: variable expansion makes arithmetic evaluation less efficient
  # New warning
  warning: line 1: in '(($foo < 50))', using '$' is slower and can introduce rounding errors

src/cmd/ksh93/{data/lexstates,sh/lex,sh/parse}.c:
- Port the improved shell lint warnings from illumos to ksh93u+m.
- The original checks for arithmetic operators involved a bunch of
  if statements with inefficient calls to strcmp(3). These were
  replaced with a more efficient switch statement that avoids
  strcmp.
This commit is contained in:
Johnothan King 2021-11-30 12:26:17 -08:00 • committed by Martijn Dekker
parent 370440473e
commit 6904585f49
4 changed files with 32 additions and 4 deletions
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2
src/cmd/ksh93/sh/parse.c
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@ -303,7 +303,7 @@ static Shnode_t *getanode(Lex_t *lp, struct argnod *ap)
else
{
if(sh_isoption(SH_NOEXEC) && (ap->argflag&ARG_MAC) && paramsub(ap->argval))
errormsg(SH_DICT,ERROR_warn(0),e_lexwarnvar,lp->sh->inlineno);
errormsg(SH_DICT,ERROR_warn(0),e_lexwarnvar,lp->sh->inlineno,ap->argval);
t->ar.arcomp = 0;
}
return(t);