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fix(mmime): correct implementation of strncasecmp

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Closes #523
This commit is contained in:
dignifiedquire
2019-10-09 14:27:15 +02:00
parent e4cca92910
commit 3a1e74a306
1 changed files with 20 additions and 9 deletions
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29
mmime/src/other.rs
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@@ -12,6 +12,10 @@ pub(crate) use libc::{
};
pub(crate) unsafe fn strcasecmp(s1: *const libc::c_char, s2: *const libc::c_char) -> libc::c_int {
if s1.is_null() || s2.is_null() {
return 1;
}
let s1 = std::ffi::CStr::from_ptr(s1)
.to_string_lossy()
.to_lowercase();
@@ -30,16 +34,23 @@ pub(crate) unsafe fn strncasecmp(
s2: *const libc::c_char,
n: libc::size_t,
) -> libc::c_int {
let s1 = std::ffi::CStr::from_ptr(s1)
.to_string_lossy()
.to_lowercase();
let s2 = std::ffi::CStr::from_ptr(s2)
.to_string_lossy()
.to_lowercase();
let m1 = std::cmp::min(n, s1.len());
let m2 = std::cmp::min(n, s2.len());
if s1.is_null() || s2.is_null() {
return 1;
}
if s1[..m1] == s2[..m2] {
// s1 and s2 might not be null terminated.
let s1_slice = std::slice::from_raw_parts(s1 as *const u8, n);
let s2_slice = std::slice::from_raw_parts(s2 as *const u8, n);
let s1 = std::ffi::CStr::from_bytes_with_nul_unchecked(s1_slice)
.to_string_lossy()
.to_lowercase();
let s2 = std::ffi::CStr::from_bytes_with_nul_unchecked(s2_slice)
.to_string_lossy()
.to_lowercase();
if s1 == s2 {
0
} else {
1