Function add_weapon_skill

src/weapon.c:1436–1450

}

void
add_weapon_skill(int n) /* number of slots to gain; normally one */
{
    int i, before, after;

    for (i = 0, before = 0; i < P_NUM_SKILLS; i++)
        if (can_advance(i, FALSE))
            before++;
    u.weapon_slots += n;
    for (i = 0, after = 0; i < P_NUM_SKILLS; i++)
        if (can_advance(i, FALSE))
            after++;
    if (before < after)
        give_may_advance_msg(P_NONE);
}

void
lose_weapon_skill(int n) /* number of slots to lose; normally one */