Function do_config_from

config.c:1355–1376

* All source specific fields in the union, die_on_error, name and the callbacks * fgetc, ungetc, ftell of top need to be initialized before calling * this function. */

 * this function.
 */
static int do_config_from(struct config_source *top, config_fn_t fn,
			  void *data, enum config_scope scope,
			  const struct config_options *opts)
{
	struct key_value_info kvi = KVI_INIT;
	int ret;

	/* push config-file parsing state stack */
	top->linenr = 1;
	top->eof = 0;
	top->total_len = 0;
	strbuf_init(&top->value, 1024);
	strbuf_init(&top->var, 1024);
	kvi_from_source(top, scope, &kvi);

	ret = git_parse_source(top, fn, &kvi, data, opts);

	strbuf_release(&top->value);
	strbuf_release(&top->var);

	return ret;
}

static int do_config_from_file(config_fn_t fn,
			       const enum config_origin_type origin_type,