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added String::truncate() and related functions.

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started adding radius dictionary file reader. incomplete yet
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hyung-hwan
2017-08-29 09:09:51 +00:00
parent 25e49a4526
commit 211f5b014e
8 changed files with 2429 additions and 7 deletions
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45
qse/include/qse/cmn/StrBase.hpp
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@ -423,6 +423,51 @@ public:
return SelfType (this->_item->buffer + index, size);
}
void truncate (qse_size_t new_size)
{
// use this function with care.
// if the new size is greater than the current capacity,
// it grows the capacity first according to the policy.
// in such a case, it still changes the length.
// if the new size is equal to or less than the current capaciy,
// it only changes the length.
// when chaning the length, it puts a null character at
// the length position. it leaves the contents of the growing
// part or the shrinking part untouched.
//
// if you want to shorten the length while growing the capacity,
// you can call truncate twice. for instance,
// str.truncate (1000).
// str.truncate (100).
StringItem* old_item = QSE_NULL;
if (this->_item->isShared())
{
StringItem* t;
if (new_size > this->_item->capacity)
t = this->_item->copy (this->getMmgr(), this->adjust_desired_capacity(new_size));
else
t = this->_item->copy (this->getMmgr());
old_item = this->_item;
this->_item = t;
this->ref_item ();
}
else if (new_size > this->_item->capacity)
{
StringItem* t = this->_item->copy (this->getMmgr(), this->adjust_desired_capacity(new_size));
old_item = this->_item;
this->_item = t;
this->ref_item ();;
}
this->_item->buffer[new_size] = NULL_CHAR;
this->_item->size = new_size;
if (old_item) this->deref_item (old_item);
}
//
// TODO: comparison, hash, trim, case-converting, etc
// utf-8 encoding/decoding