Op 29-03-17 om 20:02 schreef Martijn Dekker:
> Bug: if either the 'nolog' or the 'debug' option is set, trying to
> expand "$-" silently aborts parsing of an entire argument.
> 
> $ dash -o nolog -c 'set -fuC; echo "|$- are the options|"; \
>       set +o nolog; echo "|$- are the options|"'
> |
> |uCf are the options|
> $ dash -o debug -c 'set -fuC; echo "|$- are the options|"; \
>       set +o debug; echo "|$- are the options|"'
> |
> |uCf are the options|

This turned out to be easy to fix. The routine producing the "$-"
expansion failed to skip options for which there is no option letter,
but only a long-form name. In dash, 'nolog' and 'debug' are currently
the only two such options. Patch below.

- Martijn

diff --git a/src/expand.c b/src/expand.c
index 2a50830..71a0031 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -925,7 +925,7 @@ numvar:
        case '-':
                p = makestrspace(NOPTS, expdest);
                for (i = NOPTS - 1; i >= 0; i--) {
-                       if (optlist[i]) {
+                       if (optlist[i] && optletters[i]) {
                                USTPUTC(optletters[i], p);
                                len++;
                        }

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