Function voluntary_servitude::ffi::vs_iter_index

#[no_mangle]
pub unsafe extern "C" fn vs_iter_index(
    iter: *const VSIter<'_, *const c_void>
) -> usize

Returns current iterator index

Returns 0 if pointer to VSIter is NULL

Warning: UB if pointer to VSIter is invalid

Rust

use std::ptr::null_mut;
use voluntary_servitude::ffi::*;

unsafe {
    let vs = vs_new();
    let data: [i32; 3] = [4, 9, 8];
    assert_eq!(vs_append(vs, &data[0] as *const i32 as *const c_void), 0);
    assert_eq!(vs_append(vs, &data[1] as *const i32 as *const c_void), 0);
    assert_eq!(vs_append(vs, &data[2] as *const i32 as *const c_void), 0);

    let iter = vs_iter(vs);
    assert_eq!(vs_iter_index(iter), 0);
    assert_eq!(*(vs_iter_next(iter) as *const i32), 4);
    assert_eq!(*(vs_iter_next(iter) as *const i32), 9);
    assert_eq!(*(vs_iter_next(iter) as *const i32), 8);
    assert_eq!(vs_iter_index(iter), 3);
    assert!(vs_iter_next(iter).is_null());
    assert_eq!(vs_iter_index(iter), vs_iter_len(iter));

    assert_eq!(vs_iter_destroy(iter), 0);
    assert_eq!(vs_destroy(vs), 0);

    // 0 index on NULL pointer
    assert_eq!(vs_iter_index(null_mut()), 0);
}

C

#include<assert.h>
#include "../include/voluntary_servitude.h"

int main(int argc, char **argv) {
    vs_t * vs = vs_new();
    const unsigned int data[3] = { 4, 9, 8 };
    assert(vs_append(vs, (void *) data) == 0);
    assert(vs_append(vs, (void *) (data + 1)) == 0);
    assert(vs_append(vs, (void *) (data + 2)) == 0);

    vs_iter_t * iter = vs_iter(vs);
    assert(vs_iter_index(iter) == 0);
    assert(*(unsigned int *) vs_iter_next(iter) == 4);
    assert(*(unsigned int *) vs_iter_next(iter) == 9);
    assert(*(unsigned int *) vs_iter_next(iter) == 8);
    assert(vs_iter_index(iter) == 3);
    assert(vs_iter_next(iter) == NULL);
    assert(vs_iter_index(iter) == vs_iter_len(iter));

    assert(vs_iter_destroy(iter) == 0);
    assert(vs_destroy(vs) == 0);

    // 0 index on NULL pointer
    assert(vs_iter_index(NULL) == 0);
    return 0;
}