When parsing the argument for OPT_INTEGER and OPT_ABBREV, we check if we
can parse the entire argument to a number with "if (*s)". There is one
missing check: if "arg" is empty to begin with, we fail to notice.
This could happen with long option by writing like
git diff --inter-hunk-context= blah blah
Before 16ed6c97cc (diff-parseopt: convert --inter-hunk-context,
2019-03-24), --inter-hunk-context is handled by a custom parser
opt_arg() and does detect this correctly.
This restores the bahvior for --inter-hunk-context and make sure all
other integer options are handled the same (sane) way. For OPT_ABBREV
this is new behavior. But it makes it consistent with the rest.
PS. OPT_MAGNITUDE has similar code but git_parse_ulong() does detect
empty "arg". So it's good to go.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
parse-options-cb.c | 3 +++
parse-options.c | 3 +++
2 files changed, 6 insertions(+)
diff --git a/parse-options-cb.c b/parse-options-cb.c
index 4b95d04a37..a3de795c58 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -16,6 +16,9 @@ int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
if (!arg) {
v = unset ? 0 : DEFAULT_ABBREV;
} else {
+ if (!*arg)
+ return error(_("option `%s' expects a numerical value"),
+ opt->long_name);
v = strtol(arg, (char **)&arg, 10);
if (*arg)
return error(_("option `%s' expects a numerical value"),
diff --git a/parse-options.c b/parse-options.c
index 987e27cb91..87b26a1d92 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -195,6 +195,9 @@ static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
}
if (get_arg(p, opt, flags, &arg))
return -1;
+ if (!*arg)
+ return error(_("%s expects a numerical value"),
+ optname(opt, flags));
*(int *)opt->value = strtol(arg, (char **)&s, 10);
if (*s)
return error(_("%s expects a numerical value"),
--
2.22.0.rc0.322.g2b0371e29a
