/**
* Increases the timed effect `ef_idx` by `timer`.
*
* Calculates the new timer, then passes that to mon_set_timed().
* Note that each effect has a maximum number of turns it can be active for.
* If this function would put an effect timer over that cap, it sets it for
* that cap instead.
*
* Returns true if the monster's timer changed.
*/
bool mon_inc_timed(struct monster *mon, int ef_idx, int timer, u16b flag,
bool id)
{
struct mon_timed_effect *effect;
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
effect = &effects[ef_idx];
/* For negative amounts, we use mon_dec_timed instead */
assert(timer > 0);
/* Make it last for a mimimum # of turns if it is a new effect */
if ((!mon->m_timed[ef_idx]) && (timer < 2)) timer = 2;
/* New counter amount - prevent overflow */
if (SHRT_MAX - timer < mon->m_timed[ef_idx])
timer = SHRT_MAX;
else
timer += mon->m_timed[ef_idx];
/* Reduce to max_timer if necessary*/
if (timer > effect->max_timer)
timer = effect->max_timer;
return mon_set_timed(mon, ef_idx, timer, flag, id);
}
/**
* Increases the timed effect `ef_idx` by `timer`.
*
* Calculates the new timer, then passes that to mon_set_timed().
* Note that each effect has a maximum number of turns it can be active for.
* If this function would put an effect timer over that cap, it sets it for
* that cap instead.
*
* Returns TRUE if the monster's timer changed.
*/
bool mon_inc_timed(int m_idx, int ef_idx, int timer, u16b flag, bool id)
{
monster_type *m_ptr;
mon_timed_effect *effect;
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
effect = &effects[ef_idx];
assert(m_idx > 0);
m_ptr = cave_monster(cave, m_idx);
/* For negative amounts, we use mon_dec_timed instead */
assert(timer > 0);
/* Make it last for a mimimum # of turns if it is a new effect */
if ((!m_ptr->m_timed[ef_idx]) && (timer < 2)) timer = 2;
/* New counter amount - prevent overflow */
if (MAX_SHORT - timer < m_ptr->m_timed[ef_idx])
timer = MAX_SHORT;
else
timer += m_ptr->m_timed[ef_idx];
/* Reduce to max_timer if necessary*/
if (timer > effect->max_timer)
timer = effect->max_timer;
return mon_set_timed(m_ptr, ef_idx, timer, flag, id);
}
/**
* Clears the timed effect `ef_idx`.
*
* Returns true if the monster's timer was changed.
*/
bool mon_clear_timed(struct monster *mon, int ef_idx, u16b flag, bool id)
{
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
if (!mon->m_timed[ef_idx]) return false;
/* Clearing never fails */
flag |= MON_TMD_FLG_NOFAIL;
return mon_set_timed(mon, ef_idx, 0, flag, id);
}
/**
* Decreases the timed effect `ef_idx` by `timer`.
*
* Calculates the new timer, then passes that to mon_set_timed().
* If a timer would be set to a negative number, it is set to 0 instead.
* Note that decreasing a timed effect should never fail.
*
* Returns TRUE if the monster's timer changed.
*/
bool mon_dec_timed(struct monster *m_ptr, int ef_idx, int timer, u16b flag, bool id)
{
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
assert(timer > 0);
/* Decreasing is never resisted */
flag |= MON_TMD_FLG_NOFAIL;
/* New counter amount */
timer = m_ptr->m_timed[ef_idx] - timer;
if (timer < 0)
timer = 0;
return mon_set_timed(m_ptr, ef_idx, timer, flag, id);
}
/**
* Clears the timed effect `ef_idx`.
*
* Returns TRUE if the monster's timer was changed.
*/
bool mon_clear_timed(int m_idx, int ef_idx, u16b flag, bool id)
{
monster_type *m_ptr;
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
assert(m_idx > 0);
m_ptr = cave_monster(cave, m_idx);
if (!m_ptr->m_timed[ef_idx]) return FALSE;
/* Clearing never fails */
flag |= MON_TMD_FLG_NOFAIL;
return mon_set_timed(m_ptr, ef_idx, 0, flag, id);
}
