extraction of chirp signal

hii....i want code for a chirp signal.......in c language ......

matlab code is:
fs=3e9; //sampling freqncy=3000MHZ
t=0:1/fs:1023/fs //time
y=chirp(t,940e6,1023/fs,106e7);
figure(1);
specgram(y,256,fs,256,250);
n=2;
point=256;
for m=1:256:1024;
k=y(m:m+point-1);
z=fft(k);
figure(n);

plot(abs(z));
n=n+1;
end
aim of our project is 2 extract a linear FM signal ..i.e.,chirp
signal which we receive 4m our enemy target.......4 dat v need 2 rite
the bove code in "c" language......
cud nyone plz help me in dis.....
.

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