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Reimplement dc_str_replace() with standard Rust functions

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This change removes one more use of unstable `wrapping_offset_of'.
This commit is contained in:
Dmitry Bogatov
2019-08-07 17:35:55 +00:00
committed by holger krekel
parent 24b025f573
commit 1c5d07a29f
1 changed files with 8 additions and 45 deletions
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53
src/dc_tools.rs
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@@ -94,50 +94,14 @@ pub unsafe fn dc_str_replace(
haystack: *mut *mut libc::c_char,
needle: *const libc::c_char,
replacement: *const libc::c_char,
) -> libc::c_int {
let mut replacements: libc::c_int = 0i32;
let mut start_search_pos: libc::c_int = 0i32;
let needle_len: libc::c_int;
let replacement_len: libc::c_int;
if haystack.is_null()
|| (*haystack).is_null()
|| needle.is_null()
|| *needle.offset(0isize) as libc::c_int == 0i32
{
return 0i32;
}
needle_len = strlen(needle) as libc::c_int;
replacement_len = (if !replacement.is_null() {
strlen(replacement)
} else {
0
}) as libc::c_int;
loop {
let mut p2: *mut libc::c_char =
strstr((*haystack).offset(start_search_pos as isize), needle);
if p2.is_null() {
break;
}
start_search_pos =
(p2.wrapping_offset_from(*haystack) + replacement_len as isize) as libc::c_int;
*p2 = 0i32 as libc::c_char;
p2 = p2.offset(needle_len as isize);
let new_string: *mut libc::c_char = dc_mprintf(
b"%s%s%s\x00" as *const u8 as *const libc::c_char,
*haystack,
if !replacement.is_null() {
replacement
} else {
b"\x00" as *const u8 as *const libc::c_char
},
p2,
);
free(*haystack as *mut libc::c_void);
*haystack = new_string;
replacements += 1
}
) {
let haystack_s = to_string(*haystack);
let needle_s = to_string(needle);
let replacement_s = to_string(replacement);
replacements
free(*haystack as *mut libc::c_void);
*haystack = haystack_s.replace(&needle_s, &replacement_s).strdup();
}
pub unsafe fn dc_ftoa(f: libc::c_double) -> *mut libc::c_char {
@@ -1717,7 +1681,7 @@ mod tests {
fn test_dc_str_replace() {
unsafe {
let mut str: *mut libc::c_char = strdup(b"aaa\x00" as *const u8 as *const libc::c_char);
let replacements: libc::c_int = dc_str_replace(
dc_str_replace(
&mut str,
b"a\x00" as *const u8 as *const libc::c_char,
b"ab\x00" as *const u8 as *const libc::c_char,
@@ -1726,7 +1690,6 @@ mod tests {
CStr::from_ptr(str as *const libc::c_char).to_str().unwrap(),
"ababab"
);
assert_eq!(replacements, 3);
free(str as *mut libc::c_void);
}
}