自学教程：C++ I2A函数代码示例

/** * Display list available specialties. */void view_spec_menu(void){    menu_type menu;    menu_iter menu_f = { view_spec_tag, 0, view_spec_display, 0, 0 };    region loc = { 0, 0, 70, -99 };    char buf[80];    /* Save the screen and clear it */    screen_save();    /* Prompt choices */    sprintf(buf, "Race, class, and specialties abilities (%c-%c, ESC=exit): ",	    I2A(0), I2A(spec_known - 1));    /* Set up the menu */    menu_init(&menu, MN_SKIN_SCROLL, &menu_f);    menu.header = buf;    menu_setpriv(&menu, spec_known, spec_list);    loc.page_rows = spec_known + 1;    menu.flags = MN_DBL_TAP;    menu.browse_hook = view_spec_menu_browser;    region_erase_bordered(&loc);    menu_layout(&menu, &loc);    menu_select(&menu, 0);    /* Load screen */    screen_load();    return;}

static void _list_spells(doc_ptr doc, int options){    int i;    doc_insert(doc, "<style:table>");    doc_printf(doc, "<color:G>    %-20.20s Lvl  SP Fail %-15.15s", "Name", "Desc");    if (options & _SHOW_STATS)        doc_insert(doc, "  Cast Fail");    doc_insert(doc, "</color>/n");    for (i = 0; i < _MAX_SLOTS; i++)    {        if (_spells[i].realm != REALM_NONE)            _list_spell(doc, _spells[i].realm, _spells[i].spell, i, options);        else        {            if (options & _ALLOW_EMPTY)                doc_printf(doc, " %c) <color:D>(Empty)</color>/n", I2A(i));            else                doc_printf(doc, " <color:D>%c) (Empty)</color>/n", I2A(i));        }    }    doc_insert(doc, "</style>");    if (_browse_choice != -1 && _spells[_browse_choice].realm != REALM_NONE)    {        doc_newline(doc);        doc_printf(doc, "    <indent>%s</indent>/n/n",            do_spell(_spells[_browse_choice].realm, _spells[_browse_choice].spell, SPELL_DESC));    }}

/** * Convert a gear object into a one character label. */char gear_to_label(struct object *obj){	int i;	/* Equipment is easy */	if (object_is_equipped(player->body, obj)) {		return I2A(equipped_item_slot(player->body, obj));	}	/* Check the quiver */	for (i = 0; i < z_info->quiver_size; i++) {		if (player->upkeep->quiver[i] == obj) {			return I2D(i);		}	}	/* Check the inventory */	for (i = 0; i < z_info->pack_size; i++) {		if (player->upkeep->inven[i] == obj) {			return I2A(i);		}	}	return '/0';}

static int _choose_mimic_form(void){    int             r_idx = -1;    int             i;    _choice_array_t choices = {{{0}}};    /* List Known Forms */    for (i = 0; i < _MAX_FORMS; i++)    {        if (_forms[i])        {            int        j = choices.size++;            _choice_t *choice = &choices.choices[j];            choice->r_idx = _forms[i];            choice->slot = i;            choice->type = _TYPE_KNOWN;            choice->key = I2A(j);        }    }    /* List Visible Forms */    for (i = 1; i < m_max; i++)    {        monster_type *m_ptr = &m_list[i];        if (!m_ptr->r_idx) continue;        if (!m_ptr->ml) continue;        if (!projectable(py, px, m_ptr->fy, m_ptr->fx)) continue;        if (!r_info[m_ptr->r_idx].body.life) continue; /* Form not implemented yet ... */        _add_visible_form(&choices, m_ptr->r_idx);    }    /* Assign menu keys at the end due to insertion sort */    for (i = 0; i < choices.size; i++)    {        _choice_t *choice = &choices.choices[i];                if (choice->type == _TYPE_VISIBLE)            choice->key = I2A(i);    }    if (choices.size)    {        choices.mode = _CHOOSE_MODE_MIMIC;        if (_choose(&choices))            r_idx = choices.choices[choices.current].r_idx;        do_cmd_redraw();    }    else        msg_print("You see nothing to mimic.");    return r_idx;}

static void _list_spell(doc_ptr doc, int realm, int spell, int choice, int options){    magic_type *spell_ptr = _get_spell_info(realm, spell);    int         cost = calculate_cost(spell_ptr->smana);    int         fail = calculate_fail_rate(spell_ptr->slevel, spell_ptr->sfail, p_ptr->stat_ind[A_INT]);    if (cost > p_ptr->csp)        doc_insert(doc, "<color:D>");    else if (choice == _browse_choice)        doc_insert(doc, "<color:B>");    else if (spell_ptr->slevel > p_ptr->lev)    {        if (options & _FROM_BOOK)            doc_insert(doc, "<color:D>");        else            doc_insert(doc, "<color:y>");    }    else        doc_insert(doc, "<color:w>");    if (spell_ptr->slevel > p_ptr->lev)        doc_printf(doc, " <color:D>%c)</color> ", I2A(choice));    else        doc_printf(doc, " %c) ", I2A(choice));    doc_printf(doc, "%-20.20s ", do_spell(realm, spell, SPELL_NAME));    doc_printf(doc, "%3d %3d %3d%% ", spell_ptr->slevel, cost, fail);    if (spell_ptr->slevel > p_ptr->lev)    {        if (options & _FROM_BOOK)            doc_printf(doc, "%-15.15s", "");        else            doc_printf(doc, "%-15.15s", "Forgotten");    }    else if (options & _SHOW_INFO)        doc_printf(doc, "%-15.15s", do_spell(realm, spell, SPELL_INFO));    if (options & _SHOW_STATS)    {        spell_stats_ptr stats = spell_stats_old(realm, spell);        if (stats->ct_cast + stats->ct_fail)        {            doc_printf(doc, " %5d %4d %3d%%",                stats->ct_cast,                stats->ct_fail,                spell_stats_fail(stats)            );        }    }    doc_insert(doc, "</color>/n");}

/** * Melee effect handler: Eat the player's food. */static void melee_effect_handler_EAT_FOOD(melee_effect_handler_context_t *context){	/* Steal some food */	int tries;	/* Take damage */	take_hit(context->p, context->damage, context->ddesc);	/* Player is dead */	if (context->p->is_dead)		return;	for (tries = 0; tries < 10; tries++) {		/* Pick an item from the pack */		int index = randint0(z_info->pack_size);		struct object *obj, *eaten;		char o_name[80];		bool none_left = false;		/* Get the item */		obj = context->p->upkeep->inven[index];		/* Skip non-objects */		if (obj == NULL) continue;		/* Skip non-food objects */		if (!tval_is_edible(obj)) continue;		if (obj->number == 1) {			object_desc(o_name, sizeof(o_name), obj, ODESC_BASE);			msg("Your %s (%c) was eaten!", o_name, I2A(index));		} else {			object_desc(o_name, sizeof(o_name), obj,						ODESC_PREFIX | ODESC_BASE);			msg("One of your %s (%c) was eaten!", o_name,				I2A(index));		}		/* Steal and eat */		eaten = gear_object_for_use(obj, 1, false, &none_left);		if (eaten->known)			object_delete(&eaten->known);		object_delete(&eaten);		/* Obvious */		context->obvious = true;		/* Done */		break;	}}

/** * Overflow an item from the pack, if it is overfull. */void pack_overflow(void){	int i;	struct object *obj = NULL;	char o_name[80];	if (!pack_is_overfull()) return;	/* Disturbing */	disturb(player, 0);	/* Warning */	msg("Your pack overflows!");	/* Find the last inventory item */	for (i = 1; i <= z_info->pack_size; i++)		if (!player->upkeep->inven[i])			break;	/* Last object was the previous index */	obj = player->upkeep->inven[i - 1];	/* Rule out weirdness (like pack full, but inventory empty) */	assert(obj != NULL);	/* Describe */	object_desc(o_name, sizeof(o_name), obj, ODESC_PREFIX | ODESC_FULL);	/* Message */	msg("You drop %s (%c).", o_name, I2A(i - 1));	/* Excise the object and drop it (carefully) near the player */	gear_excise_object(obj);	drop_near(cave, obj, 0, player->py, player->px, FALSE);	/* Describe */	if (obj->artifact)		msg("You no longer have the %s (%c).", o_name, I2A(i - 1));	else		msg("You no longer have %s (%c).", o_name, I2A(i - 1));	/* Notice stuff (if needed) */	if (player->upkeep->notice) notice_stuff(player->upkeep);	/* Update stuff (if needed) */	if (player->upkeep->update) update_stuff(player->upkeep);	/* Redraw stuff (if needed) */	if (player->upkeep->redraw) redraw_stuff(player->upkeep);}

/** * Take off a non-cursed equipment item * * Note that taking off an item when "full" may cause that item * to fall to the ground. * * Note also that this function does not try to combine the taken off item * with other inventory items - that must be done by the calling function. */void inven_takeoff(struct object *obj){	int slot = equipped_item_slot(player->body, obj);	const char *act;	char o_name[80];	/* Paranoia */	if (slot == player->body.count) return;	/* Describe the object */	object_desc(o_name, sizeof(o_name), obj, ODESC_PREFIX | ODESC_FULL);	/* Describe removal by slot */	if (slot_type_is(slot, EQUIP_WEAPON))		act = "You were wielding";	else if (slot_type_is(slot, EQUIP_BOW))		act = "You were holding";	else if (slot_type_is(slot, EQUIP_LIGHT))		act = "You were holding";	else		act = "You were wearing";	/* De-equip the object */	player->body.slots[slot].obj = NULL;	player->upkeep->equip_cnt--;	/* Message */	msgt(MSG_WIELD, "%s %s (%c).", act, o_name, I2A(slot));	player->upkeep->update |= (PU_BONUS | PU_INVEN);	player->upkeep->notice |= (PN_IGNORE);	return;}

/* * Buy items from the current shop */static void borg_think_shop_buy(int item){	list_item *l_ptr = &cur_list[item];	/* Is the borg on page 1 but wants to be one page 2? */	if ((borg_term_text_comp(26, 5, "1") && item >= STORE_INVEN_MAX / 2) ||		(borg_term_text_comp(26, 5, "2") && item <  STORE_INVEN_MAX / 2))	{		/* Goto the other page */		borg_keypress(' ');	}	/* Log */	borg_note("# Buying %s (%i gold).", l_ptr->o_name, l_ptr->cost);	/* Buy one item */	borg_keypress('0');	borg_keypress('1');	/* Buy an item */	borg_keypress('p');	/* Buy the desired item */	borg_keypress(I2A(item % (STORE_INVEN_MAX / 2)));	/* Increment 'use' count */	borg_shops[shop_num].u_count++;	/* The purchase is complete */	goal_shop = -1;}

int altel6045_get_dt_data(const hwextisp_intf_t *i, struct device_node *of_node){	int ret = 0;	int index = 0;	altek6045_private_data_t* pdata = NULL;	altek6045_t* mini_isp = NULL;		mini_isp = I2A(i);	pdata = (altek6045_private_data_t *)mini_isp->pdata;	ret = of_property_read_u32_array(of_node, "hisi,isp-pin",		pdata->pin, ISP_MAX);	if (ret < 0) {		cam_err("%s failed line %d/n", __func__, __LINE__);		return ret;	} else {		for (index = 0; index < ISP_MAX; index++) {			cam_debug("%s pin[%d]=%d./n", __func__, index,				pdata->pin[index]);		}	}#if 0    ret = gpio_request(pdata->pin[ISP_DVDD], "isp-dcdc");    if (ret < 0) {        cam_err("%s failed to request isp-dvdd pin.", __func__);        return ret;    }#endif	return ret; }

/*!  * @brief スナイパ
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