checkout: Don't crash when switching away from an invalid branch.

diff --git a/parse-options.c b/parse-options.c
index 987b0157192b9fe4c7451d94f5948bdbd7f524bb..fd08bb425c241a0861588ec0aedd15041095a95f 100644 (file)
--- a/parse-options.c
+++ b/parse-options.c
@@ -22,7 +22,7 @@ static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
                p->opt = NULL;
        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
                *arg = (const char *)opt->defval;
-       } else if (p->argc) {
+       } else if (p->argc > 1) {
                p->argc--;
                *arg = *++p->argv;
        } else
@@ -483,3 +483,15 @@ int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
        *(unsigned long *)(opt->value) = approxidate(arg);
        return 0;
 }
+
+/*
+ * This should really be OPTION_FILENAME type as a part of
+ * parse_options that take prefix to do this while parsing.
+ */
+extern const char *parse_options_fix_filename(const char *prefix, const char *file)
+{
+       if (!file || !prefix || is_absolute_path(file) || !strcmp("-", file))
+               return file;
+       return prefix_filename(prefix, strlen(prefix), file);
+}
+