gvox-sys 1.2.2

Voxel file format parser
Documentation 
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use std::alloc::*;
use std::cmp::*;
use std::os::raw::*;

#[no_mangle]
pub extern "C" fn malloc(size: usize) -> *mut c_void {
    unsafe {
        let layout = Layout::from_size_align_unchecked(size, 1);
        alloc(layout).cast()
    }
}

#[no_mangle]
pub extern "C" fn calloc(nmemb: usize, size: usize) -> *mut c_void {
    unsafe {
        let layout = Layout::from_size_align_unchecked(size * nmemb, 1);
        alloc(layout).cast()
    }
}

#[no_mangle]
pub unsafe extern "C" fn posix_memalign(
    memptr: *mut *mut c_void,
    alignment: usize,
    size: usize,
) -> c_int {
    unsafe {
        let layout = Layout::from_size_align_unchecked(size, alignment);
        *memptr = alloc(layout).cast();
        0
    }
}

#[no_mangle]
pub unsafe extern "C" fn free(ptr: *mut c_void) {
    let layout = Layout::from_size_align_unchecked(1, 1);
    dealloc(ptr.cast(), layout);
}

#[no_mangle]
pub unsafe extern "C" fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char {
    let mut i = 0;
    loop {
        let char = *src.add(i);
        if char == 0 {
            break;
        } else {
            *dst.add(i) = char;
        }

        i += 1;
    }

    dst
}

#[no_mangle]
pub unsafe extern "C" fn strcmp(str1: *const c_char, str2: *const c_char) -> c_int {
    let a = std::ffi::CStr::from_ptr(str1);
    let b = std::ffi::CStr::from_ptr(str2);
    match a.cmp(b) {
        Ordering::Less => -1,
        Ordering::Equal => 0,
        Ordering::Greater => 1,
    }
}

#[no_mangle]
pub unsafe extern "C" fn strcasecmp(str1: *const c_char, str2: *const c_char) -> c_int {
    let a = std::ffi::CStr::from_ptr(str1)
        .to_string_lossy()
        .to_lowercase();
    let b = std::ffi::CStr::from_ptr(str2)
        .to_string_lossy()
        .to_lowercase();
    match a.cmp(&b) {
        Ordering::Less => -1,
        Ordering::Equal => 0,
        Ordering::Greater => 1,
    }
}

#[no_mangle]
pub unsafe extern "C" fn atof(str: *const c_char) -> f64 {
    std::ffi::CStr::from_ptr(str)
        .to_str()
        .ok()
        .and_then(|x| x.parse().ok())
        .unwrap_or_default()
}

#[no_mangle]
pub unsafe extern "C" fn atoi(str: *const c_char) -> c_int {
    std::ffi::CStr::from_ptr(str)
        .to_str()
        .ok()
        .and_then(|x| x.parse().ok())
        .unwrap_or_default()
}

#[no_mangle]
pub unsafe extern "C" fn abort() {
    std::process::abort();
}