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Fix wrong syntax error upon process substitution after redirection

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Grammatically, redirections may occur anywhere within a command
line and are removed after processing them, whereas a process
substitution (<(commandlist) or >(commandlist)) is replaced by a
file name which should be treated as just another simple word.
So the following should not be a syntax error:

$ cat </dev/null <(true)
-ksh: syntax error: `)' unexpected
$ cat </dev/null >(true)
-ksh: syntax error: `)' unexpected
$ cat >/dev/null <(true)
-ksh: syntax error: `)' unexpected
$ cat >/dev/null >(true)
-ksh: syntax error: `)' unexpected

This bug is in every ksh93 version.

The problem is in the parser (parse.c). The process substitution is
misparsed as a redirection due to inout() recursively parsing
multiple redirections without recognising process substitutions.
inout() is mistaking '<(' for '<' and '>(' for '>', which explains
the incorrect syntax error.

This also causes the following to fail to detect a syntax error:
$ cat >&1 <(README.md
[the contents of README.md are shown]

...and other syntax errors detected in the wrong spot, for example:
$ { true; } <(echo wrong)
-ksh: syntax error: `wrong' unexpected
which should be:
-ksh: syntax error: `<(' unexpected

src/cmd/ksh93/sh/parse.c:
- Add global inout_found_procsub flag.
- inout(): On encountering a process substitution, set this flag
  and return, otherwise clear the flag.
- simple(): After calling inout(), check this flag and, if set,
  jump back to where process substitutions are parsed.

Resolves: https://github.com/ksh93/ksh/issues/418
This commit is contained in:
Martijn Dekker 2022-07-05 13:01:26 +02:00
parent 8a0920ea0a
commit 06e56251b9
4 changed files with 44 additions and 1 deletions
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2
src/cmd/ksh93/include/version.h
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@ -23,7 +23,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2022-07-02" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2022-07-05" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2022 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */