请问下面的函数代表什么功能？
unsigned int NF_search(unsigned int b_addr){
unsigned char tempchar,bit_offset;
unsigned int byte_offset;
while(1){
byte_offset=(unsigned int)b_addr/8;
bit_offset=(unsigned char)b_addr%8;
tempchar=invalidtab;
while(bit_offset!=0){ tempchar=tempchar>>1;bit_offset--; }
tempchar&=0x01;
if(tempchar!=0x00){ return b_addr;}
b_addr++;
if (b_addr==4095) return 0;
}
}
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