hush: add a comment where we differ from bash wrt heredoc EOF mark handling

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-04-01 18:55:00 +02:00
parent 41fddb4372
commit bb6f573ad2
3 changed files with 8 additions and 15 deletions

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@ -3861,6 +3861,13 @@ static int done_word(o_string *word, struct parse_context *ctx)
* shell may perform it, but shall do so only when
* the expansion would result in one word."
*/
//bash does not do parameter/command substitution or arithmetic expansion
//for _heredoc_ redirection word: these constructs look for exact eof marker
// as written:
// <<EOF$t
// <<EOF$((1))
// <<EOF`true` [this case also makes heredoc "quoted", a-la <<"EOF"]
//This contradicts the above docs.
ctx->pending_redirect->rd_filename = xstrdup(word->data);
/* Cater for >\file case:
* >\a creates file a; >\\a, >"\a", >"\\a" create file \a
@ -4228,6 +4235,7 @@ static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_
redir->rd_type = REDIRECT_HEREDOC2;
/* redir->rd_dup is (ab)used to indicate <<- */
bb_error_msg("redir->rd_filename:'%s'", redir->rd_filename);
p = fetch_till_str(&ctx->as_string, input,
redir->rd_filename, redir->rd_dup);
if (!p) {

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@ -1,5 +0,0 @@
heredoc1
Ok1:0
heredoc2
EO`false`F
Ok2:0

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@ -1,10 +0,0 @@
cat <<EO`true`F
heredoc1
EO`true`F
echo Ok1:$?
cat <<EO`true`F
heredoc2
EO`false`F
EO`true`F
echo Ok2:$?