ssize_t spk_var_store()

in speakup/kobjects.c [622:701]

• 72 lines of code
• 23 McCabe index (conditional complexity)

ssize_t spk_var_store(struct kobject *kobj, struct kobj_attribute *attr,
		      const char *buf, size_t count)
{
	struct st_var_header *param;
	int ret;
	int len;
	char *cp;
	struct var_t *var_data;
	long value;
	unsigned long flags;

	param = spk_var_header_by_name(attr->attr.name);
	if (!param)
		return -EINVAL;
	if (!param->data)
		return 0;
	ret = 0;
	cp = (char *)buf;
	string_unescape_any_inplace(cp);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	switch (param->var_type) {
	case VAR_NUM:
	case VAR_TIME:
		if (*cp == 'd' || *cp == 'r' || *cp == '\0')
			len = E_DEFAULT;
		else if (*cp == '+' || *cp == '-')
			len = E_INC;
		else
			len = E_SET;
		if (kstrtol(cp, 10, &value) == 0)
			ret = spk_set_num_var(value, param, len);
		else
			pr_warn("overflow or parsing error has occurred");
		if (ret == -ERANGE) {
			var_data = param->data;
			pr_warn("value for %s out of range, expect %d to %d\n",
				param->name,
				var_data->u.n.low, var_data->u.n.high);
		}

	       /*
		* If voice was just changed, we might need to reset our default
		* pitch and volume.
		*/
		if (param->var_id == VOICE && synth &&
		    (ret == 0 || ret == -ERESTART)) {
			var_data = param->data;
			value = var_data->u.n.value;
			spk_reset_default_value("pitch", synth->default_pitch,
						value);
			spk_reset_default_value("vol", synth->default_vol,
						value);
		}
		break;
	case VAR_STRING:
		len = strlen(cp);
		if ((len >= 1) && (cp[len - 1] == '\n'))
			--len;
		if ((len >= 2) && (cp[0] == '"') && (cp[len - 1] == '"')) {
			++cp;
			len -= 2;
		}
		cp[len] = '\0';
		ret = spk_set_string_var(cp, param, len);
		if (ret == -E2BIG)
			pr_warn("value too long for %s\n",
				param->name);
		break;
	default:
		pr_warn("%s unknown type %d\n",
			param->name, (int)param->var_type);
	break;
	}
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);

	if (ret == -ERESTART)
		pr_info("%s reset to default value\n", param->name);
	return count;
}