static int GM_CDECL gmfStringMid(gmThread * a_thread)
{
GM_CHECK_NUM_PARAMS(2);
int first = 0, count = 0;
if(!gmGetFloatOrIntParamAsInt(a_thread, 0, first)) {return GM_EXCEPTION;}
if(!gmGetFloatOrIntParamAsInt(a_thread, 1, count)) {return GM_EXCEPTION;}
const gmVariable * var = a_thread->GetThis();
GM_ASSERT(var->m_type == GM_STRING);
gmStringObject * strObj = (gmStringObject *) GM_OBJECT(var->m_value.m_ref);
const char * str = (const char *) *strObj;
int length = strObj->GetLength();
//Check bounds
if (first < 0)
{
first = 0;
}
if (count < 0)
{
count = 0;
}
if (first + count > length)
{
count = length - first;
}
if (first > length)
{
count = 0;
}
char * buffer = (char *) alloca(count + 1);
memcpy(buffer, str + first, count);
buffer[count] = 0;
a_thread->PushNewString(buffer);
return GM_OK;
}
// *-------------------------------------------------------------
// 脚本中ByteBuffer类型的构造函数
static int GM_CDECL Buffer(gmThread* a_thread)
{
gmByteBuffer* buf = new gmByteBuffer();
int numParams = a_thread->GetNumParams();
if (numParams > 0)
buf->m_byteBuffer->reserve(gmGetFloatOrIntParamAsInt(a_thread, 0));
a_thread->PushNewUser(buf, GM_BYTEBUFFER);
return GM_OK;
}
