David Carlier
75 lines
1.7 KiB
Rust
75 lines
1.7 KiB
Rust
//! strings implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/strings.h.html
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use core::ptr;
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use core::arch;
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use crate::{
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header::{ctype, string},
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platform::types::*,
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};
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#[no_mangle]
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pub unsafe extern "C" fn bcmp(first: *const c_void, second: *const c_void, n: size_t) -> c_int {
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string::memcmp(first, second, n)
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}
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#[no_mangle]
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pub unsafe extern "C" fn bcopy(src: *const c_void, dst: *mut c_void, n: size_t) {
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ptr::copy(src as *const u8, dst as *mut u8, n);
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}
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#[no_mangle]
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pub unsafe extern "C" fn bzero(dst: *mut c_void, n: size_t) {
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ptr::write_bytes(dst as *mut u8, 0, n);
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}
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#[no_mangle]
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pub unsafe extern "C" fn explicit_bzero(s: *mut c_void, n: size_t) {
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for i in 0..n {
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*(s as *mut u8).add(i) = 0 as u8;
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}
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arch::asm!("");
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}
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#[no_mangle]
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pub extern "C" fn ffs(i: c_int) -> c_int {
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if i == 0 {
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return 0;
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}
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1 + i.trailing_zeros() as c_int
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}
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#[no_mangle]
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pub unsafe extern "C" fn index(s: *const c_char, c: c_int) -> *mut c_char {
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string::strchr(s, c)
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}
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#[no_mangle]
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pub unsafe extern "C" fn rindex(s: *const c_char, c: c_int) -> *mut c_char {
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string::strrchr(s, c)
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}
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#[no_mangle]
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pub unsafe extern "C" fn strcasecmp(first: *const c_char, second: *const c_char) -> c_int {
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strncasecmp(first, second, size_t::max_value())
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}
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#[no_mangle]
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pub unsafe extern "C" fn strncasecmp(
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mut first: *const c_char,
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mut second: *const c_char,
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mut n: size_t,
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) -> c_int {
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while n > 0 && (*first != 0 || *second != 0) {
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let cmp = ctype::tolower(*first as c_int) - ctype::tolower(*second as c_int);
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if cmp != 0 {
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return cmp;
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}
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first = first.offset(1);
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second = second.offset(1);
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n -= 1;
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}
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0
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}
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