PATCH] parse-options: allow omitting option help text
- From
René Scharfe <l.s.r@web.de>
- Date
- Aug 26, 2023, 08:06 UTC
- Message-ID
- <2b08dc43-621d-2170-c4a6-c2aac33a9a19@web.de>
1b68387e02 (builtin/receive-pack.c: use parse_options API, 2016-03-02) added the options --stateless-rpc, --advertise-refs and --reject-thin-pack-for-testing with a NULL `help` string; 03831ef7b5 (difftool: implement the functionality in the builtin, 2017-01-19) similarly added the "helpless" option --prompt. Presumably this was done because all four options are hidden and self-explanatory.
They cause a NULL pointer dereference when using the option --help-all with their respective tool, though. Handle such options gracefully instead by turning the NULL pointer into an empty string at the top of the loop, always printing a newline at the end and passing through the separating newlines from the help text.
Signed-off-by: René Scharfe <l.s.r@web.de> --- parse-options.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/parse-options.c b/parse-options.c index 76d2e76b49..e8e076c3a6 100644 --- a/parse-options.c +++ b/parse-options.c @@ -1186,14 +1186,15 @@ static enum parse_opt_result usage_with_options_internal(struct parse_opt_ctx_t continue; } - for (cp = _(opts->help); *cp; cp = np) { + for (cp = opts->help ? _(opts->help) : ""; *cp; cp = np) { np = strchrnul(cp, '\n'); - usage_padding(outfile, pos); - fprintf(outfile, "%.*s\n", (int)(np - cp), cp); if (*np) np++; + usage_padding(outfile, pos); + fwrite(cp, 1, np - cp, outfile); pos = 0; } + fputc('\n', outfile); if (positive_name) { if (find_option_by_long_name(all_opts, positive_name)) -- 2.42.0