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Convert binary ( integer and fraction) from vhdl to decimal in C code,negative value

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I learned from this link ( that I could convert a binary (consists of both integer and fraction) to decimal values. 



I am wondering if this code can be used to check for negative value? I did try with a binary string of 11111101.11 and it gives the output of 253.75... 



I have two questions: 



What are the modifications I need to do in order to read a negative value? 

I know that I can do the bit shift (as below) to check if the msb is 1, if it is 1, I know it is negative value... 



if (14bit_data & 0x2000) //if true, it is negative value 


The issue is, since it involves fraction part (but not only integer), it confused me a bit if the method still works... 



If the binary number is originally not in string format, is there any way I could convert it to string? The binary number is originally fed from a fpga block say, 14 bits, with msb as the sign bit, the following 6 bits are the magnitude for integer and the last 6 bits are the magnitude for fractional part. 



Any idea please? Thank you in advance
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