How do I wrap an existing C function in Rust or how do I call a C function from Rust?

Ganesh

I have existing C code and its header files, and I need to call the C code from Rust. I've tried many ways and referenced the documentation, but I don't understand how to apply this to my code. I'm having trouble converting a C function to Rust. Please help me with some examples so I can easily understand.

I tried using the examples given in the Rust book and other website examples, but there are no resources for more details on this.

C_code.h

void ifx_vec_init_r(ifx_Vector_R_t* vector,
                    ifx_Float_t* d,
                    uint32_t length);

void ifx_vec_init_c(ifx_Vector_C_t* vector,
                    ifx_Complex_t* d,
                    uint32_t length);

void ifx_vec_rawview_r(ifx_Vector_R_t* vector,
                       ifx_Float_t* d,
                       uint32_t length,
                       uint32_t stride);

void ifx_vec_sub_r(const ifx_Vector_R_t* v1,
                   const ifx_Vector_R_t* v2,
                   ifx_Vector_R_t* result);

I want to call all of the above functions in Rust, but I can't understand how to start or how to change it. What do we need to pay attention to to wrap this C code? What are the ways?

Encoder-256

If you're trying to call C code from Rust, you'll need to create FFI bindings, as some people mentioned in the comments.

However, it's usually best to do this via , which automatically generates bindings and includes tests to make sure the result is sized correctly, aligned, etc. It's very easy to create an incorrectly sized type, which will give you no warnings at compile time and may result in undefined behavior unless you use .rust-bindgenbindgen

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