[SAC-HELP] how to read and write sac file in C program

[Sunil Roy]

Hi,

I want to read and write the sac file in C program.
As I want to do some basic operation like 3D rotation [LQT] 
and time shift. 
SAC file can be read in C by #include "sac.h", but I want
to know how. I want to write the changes to header.

Thanks for the help

Sunil 
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