Null Pointer Protection

In standard C, passing a NULL pointer into a standard library function (like strcpy or strlen) is a fatal mistake. The library will blindly attempt to read or write to memory address 0x0, resulting in an immediate Segmentation Fault and a hard crash of your entire application.

NextStd takes a drastically different approach to memory safety by leveraging its Rust backend as a protective shield.

The FFI Shield

Because NextStd’s core logic is executed in Rust, every pointer passed from your C code must cross the Foreign Function Interface (FFI) boundary.

Before NextStd ever attempts to read or write to a pointer you provide, the Rust backend actively verifies that the pointer is not null (using Rust’s .is_null() checks).

If a NULL pointer is detected, the Rust backend immediately halts the operation and returns a safe ns_error_t code (typically NS_ERROR_ANY or a specific null-pointer error code) back to C.

Graceful Failure in Action

Because NextStd intercepts the NULL pointer and translates it into an error code, your application continues running safely. You can then use your NS_TRY and NS_EXCEPT macros to handle the mistake gracefully.

Here is an example of attempting to initialize a string, but accidentally passing NULL instead of a valid memory address:

#include <nextstd/ns.h>
#include <stddef.h> // For NULL

int main() {
    ns_error_t err;

    // We maliciously pass NULL instead of a valid &ns_string pointer
    NS_TRY(err, ns_string_new(NULL, "This would normally crash!")) {

        ns_println("This block will never execute.");

    } 
    NS_EXCEPT(err, NS_ERROR_ANY) {

        // NextStd caught the NULL pointer and routed us here safely!
        ns_println("Crisis averted! NextStd refused to dereference the NULL pointer.");

    }

    return 0;
}

Why This Matters

By neutralizing NULL pointers at the library boundary, NextStd drastically reduces the debugging time spent hunting down mysterious segfaults. It transforms catastrophic system crashes into manageable, predictable error states that you can catch and log.