clippy: fix manual_is_multiple_of lint (#10775)

* clippy: fix manual_is_multiple_of lint

https://rust-lang.github.io/rust-clippy/master/index.html#manual_is_multiple_of

* fmt

* taplo

.cargo/config.toml

@@ -15,9 +15,4 @@ LIBSTDBUF_DIR = "/usr/local/libexec/coreutils"
 
 # remove me
 [build]
-rustflags = [
-  "-A",
-  "clippy::collapsible_if",
-  "-A",
-  "clippy::manual_is_multiple_of",
-]
+rustflags = ["-A", "clippy::collapsible_if"]

Cargo.toml

@@ -642,8 +642,7 @@ unexpected_cfgs = { level = "warn", check-cfg = [
 unused_qualifications = "warn"
 
 [workspace.lints.clippy]
-manual_is_multiple_of = { level = "allow", priority = 127 } # remove me
-collapsible_if = { level = "allow", priority = 127 }        # remove me
+collapsible_if = { level = "allow", priority = 127 } # remove me
 # The counts were generated with this command:
 #   cargo clippy --all-targets --workspace --message-format=json --quiet \
 #     | jq -r '.message.code.code | select(. != null and startswith("clippy::"))' \

src/uu/df/src/blocks.rs

@@ -107,7 +107,7 @@ pub(crate) fn to_magnitude_and_suffix(
 
         if quot >= 100 && rem > 0 {
             format!("{}{suffix}", quot + 1)
-        } else if rem % (bases[i] / 10) == 0 {
+        } else if rem.is_multiple_of(bases[i] / 10) {
             format!("{quot}.{tenths_place}{suffix}")
         } else if tenths_place + 1 == 10 || quot >= 10 {
             let quot = quot + 1;

src/uu/nl/src/nl.rs

@@ -172,7 +172,7 @@ impl SectionDelimiter {
     fn parse(bytes: &[u8], pattern: &OsStr) -> Option<Self> {
         let pattern = pattern.as_encoded_bytes();
 
-        if bytes.is_empty() || pattern.is_empty() || bytes.len() % pattern.len() != 0 {
+        if bytes.is_empty() || pattern.is_empty() || !bytes.len().is_multiple_of(pattern.len()) {
             return None;
         }
 
@@ -426,7 +426,9 @@ fn nl<T: Read>(reader: &mut BufReader<T>, stats: &mut Stats, settings: &Settings
                 NumberingStyle::All
                     if line.is_empty()
                         && settings.join_blank_lines > 0
-                        && stats.consecutive_empty_lines % settings.join_blank_lines != 0 =>
+                        && !stats
+                            .consecutive_empty_lines
+                            .is_multiple_of(settings.join_blank_lines) =>
                 {
                     false
                 }

src/uu/wc/src/count_fast.rs

@@ -136,7 +136,7 @@ pub(crate) fn count_bytes_fast<T: WordCountable>(handle: &mut T) -> (usize, Opti
                 && stat.st_size > 0
             {
                 let sys_page_size = unsafe { sysconf(_SC_PAGESIZE) as usize };
-                if stat.st_size as usize % sys_page_size > 0 {
+                if !(stat.st_size as usize).is_multiple_of(sys_page_size) {
                     // regular file or file from /proc, /sys and similar pseudo-filesystems
                     // with size that is NOT a multiple of system page size
                     return (stat.st_size as usize, None);

src/uucore/src/lib/features/checksum/validate.rs

@@ -417,7 +417,7 @@ impl LineFormat {
         // checksums that are fully alphanumeric. Another check happens later
         // when we are provided with a length hint to detect ambiguous
         // base64-encoded checksums.
-        if is_base64 && checksum.len() % 4 != 0 {
+        if is_base64 && !checksum.len().is_multiple_of(4) {
             return None;
         }
 
@@ -493,7 +493,7 @@ fn get_raw_expected_digest(checksum: &str, byte_len_hint: Option<usize>) -> Opti
     // If the length of the digest is not a multiple of 2, then it must be
     // improperly formatted (1 byte is 2 hex digits, and base64 strings should
     // always be a multiple of 4).
-    if checksum.len() % 2 != 0 {
+    if !checksum.len().is_multiple_of(2) {
         return None;
     }
 
@@ -516,7 +516,7 @@ fn get_raw_expected_digest(checksum: &str, byte_len_hint: Option<usize>) -> Opti
     // It is important to check it before trying to decode, because the
     // forgiving mode of decoding will ignore if padding characters '=' are
     // MISSING, but to match GNU's behavior, we must reject it.
-    if checksum.len() % 4 != 0 {
+    if !checksum.len().is_multiple_of(4) {
         return None;
     }
 

src/uucore/src/lib/features/encoding.rs

@@ -100,7 +100,7 @@ impl SupportsFastDecodeAndEncode for Base64SimdWrapper {
                     // If there are no more '=' bytes the tail might still be padded
                     // (len % 4 == 0) or purposely unpadded (GNU --ignore-garbage or
                     // concatenated streams), so select the matching alphabet.
-                    let decoder = if remaining.len() % 4 == 0 {
+                    let decoder = if remaining.len().is_multiple_of(4) {
                         Self::decode_with_standard
                     } else {
                         Self::decode_with_no_pad
@@ -448,7 +448,7 @@ impl SupportsFastDecodeAndEncode for Z85Wrapper {
     fn encode_to_vec_deque(&self, input: &[u8], output: &mut VecDeque<u8>) -> UResult<()> {
         // According to the spec we should not accept inputs whose len is not a multiple of 4.
         // However, the z85 crate implements a padded encoding and accepts such inputs. We have to manually check for them.
-        if input.len() % 4 != 0 {
+        if !input.len().is_multiple_of(4) {
             return Err(USimpleError::new(
                 1,
                 "error: invalid input (length must be multiple of 4 characters)".to_owned(),