pub use super::libc::*;
// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/string.h.html
#[no_mangle]
pub unsafe extern fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char {
let n = strlen(src) + 1;
let mut i = 0;
while i < n {
*dst.offset(i as isize) = *src.offset(i as isize);
i += 1;
}
dst
}
/*
#[no_mangle]
pub unsafe extern fn strncpy(dst: *mut c_char, src: *const c_char, n: size_t) -> *mut c_char { 0 }
*/
#[no_mangle]
pub unsafe extern fn strcat(dst: *mut c_char, src: *const c_char) -> *mut c_char {
strcpy(dst.offset(strlen(dst) as isize), src)
}
/*
#[no_mangle]
pub unsafe extern fn strncat(dst: *mut c_char, src: *const c_char, mut n: size_t) -> *mut c_char { 0 }
*/
#[no_mangle]
pub unsafe extern fn strcmp(cs: *const c_char, ct: *const c_char) -> c_int {
let mut cs_ptr = cs;
let mut ct_ptr = ct;
while *cs_ptr != 0 && *cs_ptr == *ct_ptr {
cs_ptr = cs_ptr.offset(1);
ct_ptr = ct_ptr.offset(1);
}
(*cs_ptr - *ct_ptr) as c_int
}
#[no_mangle]
pub unsafe extern fn strncmp(cs: *const c_char, ct: *const c_char, mut n: size_t) -> c_int {
let mut cs_ptr = cs;
let mut ct_ptr = ct;
// FIXME: checking every byte is slow, grab per-word optimisation from glibc
while n > 0 {
if *cs_ptr == 0 || *cs_ptr != *ct_ptr {
break;
}
cs_ptr = cs_ptr.offset(1);
ct_ptr = ct_ptr.offset(1);
n -= 1;
}
(*cs_ptr - *ct_ptr) as c_int
}
/*
#[no_mangle]
pub unsafe extern fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int { 0 }
#[no_mangle]
pub unsafe extern fn strchr(cs: *const c_char, c: c_int) -> *mut c_char { 0 }
#[no_mangle]
pub unsafe extern fn strrchr(cs: *const c_char, c: c_int) -> *mut c_char { 0 }
#[no_mangle]
pub unsafe extern fn strspn(cs: *const c_char, ct: *const c_char) -> size_t { 0 }
#[no_mangle]
pub unsafe extern fn strcspn(cs: *const c_char, ct: *const c_char) -> size_t { 0 }
#[no_mangle]
pub unsafe extern fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char { 0 }
#[no_mangle]
pub unsafe extern fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char { 0 }
*/
#[no_mangle]
pub unsafe extern fn strlen(cs: *const c_char) -> size_t {
let mut ptr = cs;
// FIXME: checking every byte is slow, grab per-word optimisation from glibc
while *ptr != 0 {
ptr = ptr.offset(1);
}
ptr as size_t - cs as size_t
}
/*
#[no_mangle]
pub unsafe extern fn strerror(n: c_int) -> *mut c_char { 0 }
#[no_mangle]
pub unsafe extern fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char { 0 }
#[no_mangle]
pub unsafe extern fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t { 0 }
*/
#[cfg(test)]
mod test {
use super::*;
use test::black_box;
#[test]
fn test_strcpy() {
let orig: &[c_char; 7] = &black_box([48, 49, 50, 5, 10, 15, 0]);
let src: &[c_char; 7] = &black_box([1, 2, 3, 4, 5, 6, 0]);
let dst: &mut [c_char; 7] = &mut black_box([48, 49, 50, 5, 10, 15, 0]);
unsafe {
assert_eq!(dst, orig);
strcpy(dst.as_mut_ptr(), src.as_ptr());
assert_eq!(dst, src);
}
}
#[test]
fn test_strcat() {
let dst: &mut [c_char; 13] = &mut black_box([48, 49, 50, 5, 10, 15, 0, 0, 0, 0, 0, 0, 0]);
let one: &[c_char; 7] = &black_box([1, 2, 3, 4, 5, 6, 0]);
let one_res: &[c_char; 13] = &black_box([48, 49, 50, 5, 10, 15, 1, 2, 3, 4, 5, 6, 0]);
unsafe {
strcat(dst.as_mut_ptr(), one.as_ptr());
assert_eq!(dst, one_res);
}
}
/*
#[test]
fn test_strncat() {
let dst: &mut [c_char; 10] = &mut black_box([48, 49, 50, 5, 10, 15, 0, 0, 0, 0]);
let one: &[c_char; 7] = &black_box([1, 2, 3, 4, 5, 6, 0]);
let one_res: &[c_char; 10] = &black_box([48, 49, 50, 5, 10, 15, 1, 2, 3, 0]);
unsafe {
strncat(dst.as_mut_ptr(), one.as_ptr(), 3);
assert_eq!(dst, one_res);
}
}
*/
#[test]
fn test_strcmp() {
let one: &[c_char; 7] = &black_box([48, 49, 50, 5, 10, 15, 0]);
let two: &[c_char; 7] = &black_box([48, 49, 50, 6, 10, 15, 0]);
let three: &[c_char; 7] = &black_box([48, 49, 50, 0, 10, 15, 0]);
unsafe {
assert_eq!(strcmp(one.as_ptr(), one.as_ptr()), 0);
assert_eq!(strcmp(one.as_ptr(), two.as_ptr()), -1);
assert_eq!(strcmp(one.as_ptr(), three.as_ptr()), 5);
assert_eq!(strcmp(two.as_ptr(), one.as_ptr()), 1);
assert_eq!(strcmp(two.as_ptr(), three.as_ptr()), 6);
assert_eq!(strcmp(three.as_ptr(), one.as_ptr()), -5);
assert_eq!(strcmp(three.as_ptr(), two.as_ptr()), -6);
}
}
#[test]
fn test_strncmp() {
let one: &[c_char; 7] = &black_box([48, 49, 50, 5, 10, 15, 0]);
let two: &[c_char; 7] = &black_box([48, 49, 50, 6, 10, 15, 0]);
let three: &[c_char; 7] = &black_box([48, 49, 50, 0, 10, 15, 0]);
unsafe {
assert_eq!(strncmp(one.as_ptr(), one.as_ptr(), 6), 0);
assert_eq!(strncmp(one.as_ptr(), one.as_ptr(), 0), 0);
assert_eq!(strncmp(one.as_ptr(), one.as_ptr(), 3), 0);
assert_eq!(strncmp(one.as_ptr(), one.as_ptr(), 20), 0);
assert_eq!(strncmp(one.as_ptr(), two.as_ptr(), 6), -1);
assert_eq!(strncmp(one.as_ptr(), three.as_ptr(), 6), 5);
assert_eq!(strncmp(two.as_ptr(), one.as_ptr(), 6), 1);
assert_eq!(strncmp(two.as_ptr(), three.as_ptr(), 6), 6);
assert_eq!(strncmp(three.as_ptr(), one.as_ptr(), 6), -5);
assert_eq!(strncmp(three.as_ptr(), two.as_ptr(), 6), -6);
}
}
#[test]
fn test_strlen() {
let cs: &[c_char; 4] = &black_box([48, 49, 50, 0]);
unsafe {
assert_eq!(strlen(cs.as_ptr()), 3);
}
let weird: &[c_char; 8] = &black_box([48, 49, 50, 0, 5, 10, 15, 0]);
unsafe {
assert_eq!(strlen(weird.as_ptr()), 3);
}
let null: &[c_char; 1] = &black_box([0]);
unsafe {
assert_eq!(strlen(null.as_ptr()), 0);
}
let long: &[c_char; 1024] = &black_box([32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 0]);
unsafe {
assert_eq!(strlen(long.as_ptr()), 1023);
}
}
}