Merge branch 'ptr-offset-by-literal-lint' into 'master'

add ptr_offset_by_literal clippy lint and set to deny

See merge request redox-os/relibc!1527

Cargo.toml

@@ -36,6 +36,7 @@ mut_from_ref = "deny"
 precedence = "deny"
 ptr_as_ptr = "warn" # TODO review occurrences
 ptr_cast_constness = "warn" # TODO review occurrences
+ptr_offset_by_literal = "deny"
 ref_as_ptr = "warn" # TODO review occurrences
 upper_case_acronyms = "allow" # TODO review occurrences
 zero_ptr = "deny" # must allow on public constants due to cbindgen issue

src/header/fnmatch/mod.rs

@@ -61,7 +61,7 @@ unsafe fn tokenize(mut pattern: *const u8, flags: c_int) -> Tree {
         leading = false;
 
         let c = unsafe { *pattern };
-        pattern = unsafe { pattern.offset(1) };
+        pattern = unsafe { pattern.add(1) };
 
         match (c == b'*', need_collapsing) {
             (true, true) => continue,
@@ -76,7 +76,7 @@ unsafe fn tokenize(mut pattern: *const u8, flags: c_int) -> Tree {
                     // Trailing backslash. Maybe error here?
                     break;
                 }
-                pattern = unsafe { pattern.offset(1) };
+                pattern = unsafe { pattern.add(1) };
                 leading = is_leading(flags, c);
                 (Token::Char(c), ONCE)
             }
@@ -85,7 +85,7 @@ unsafe fn tokenize(mut pattern: *const u8, flags: c_int) -> Tree {
             b'[' => {
                 let mut list: Vec<Collation> = Vec::new();
                 let invert = if unsafe { *pattern == b'!' } {
-                    pattern = unsafe { pattern.offset(1) };
+                    pattern = unsafe { pattern.add(1) };
                     true
                 } else {
                     false
@@ -96,12 +96,12 @@ unsafe fn tokenize(mut pattern: *const u8, flags: c_int) -> Tree {
                     if c == 0 {
                         break;
                     }
-                    pattern = unsafe { pattern.offset(1) };
+                    pattern = unsafe { pattern.add(1) };
                     match c {
                         b']' => break,
                         b'\\' => {
                             c = unsafe { *pattern };
-                            pattern = unsafe { pattern.offset(1) };
+                            pattern = unsafe { pattern.add(1) };
                             if c == 0 {
                                 // Trailing backslash. Maybe error?
                                 break;
@@ -109,9 +109,9 @@ unsafe fn tokenize(mut pattern: *const u8, flags: c_int) -> Tree {
                         }
                         _ => (),
                     }
-                    if unsafe { *pattern == b'-' && *pattern.offset(1) != 0 } {
-                        let end = unsafe { *pattern.offset(1) };
-                        pattern = unsafe { pattern.offset(2) };
+                    if unsafe { *pattern == b'-' && *pattern.add(1) != 0 } {
+                        let end = unsafe { *pattern.add(1) };
+                        pattern = unsafe { pattern.add(2) };
                         for c in c..=end {
                             if can_push(was_leading, flags, c) {
                                 list.push(Collation::Char(c));

src/header/getopt/mod.rs

@@ -63,7 +63,7 @@ pub unsafe extern "C" fn getopt_long(
             if unsafe {
                 current_arg.is_null()
                     || *current_arg != ByteLiteral::cast_cchar(b'-')
-                    || *current_arg.offset(1) == 0
+                    || *current_arg.add(1) == 0
             } {
                 -1
             } else if unsafe { string::strcmp(current_arg, c"--".as_ptr()) == 0 } {
@@ -73,10 +73,10 @@ pub unsafe extern "C" fn getopt_long(
                 -1
             } else {
                 // remove the '-'
-                let current_arg = unsafe { current_arg.offset(1) };
+                let current_arg = unsafe { current_arg.add(1) };
 
                 if unsafe { *current_arg == ByteLiteral::cast_cchar(b'-') } && !longopts.is_null() {
-                    let current_arg = unsafe { current_arg.offset(1) };
+                    let current_arg = unsafe { current_arg.add(1) };
                     // is a long option
                     for i in 0.. {
                         let opt = unsafe { &*longopts.offset(i) };
@@ -156,7 +156,7 @@ unsafe fn parse_arg(
     optstring: *const c_char,
 ) -> c_int {
     let update_current_opt = || unsafe {
-        CURRENT_OPT = current_arg.offset(1);
+        CURRENT_OPT = current_arg.add(1);
         if *CURRENT_OPT == 0 {
             optind += 1;
         }
@@ -178,7 +178,7 @@ unsafe fn parse_arg(
         }
         Some(GetoptOption::OptArg) => unsafe {
             CURRENT_OPT = c"".as_ptr().cast_mut();
-            if *current_arg.offset(1) == 0 {
+            if *current_arg.add(1) == 0 {
                 optind += 2;
                 if optind > argc {
                     CURRENT_OPT = ptr::null_mut();
@@ -200,7 +200,7 @@ unsafe fn parse_arg(
                     c_int::from(*current_arg)
                 }
             } else {
-                optarg = current_arg.offset(1);
+                optarg = current_arg.add(1);
                 optind += 1;
 
                 c_int::from(*current_arg)

src/header/netdb/mod.rs

@@ -269,7 +269,7 @@ pub unsafe extern "C" fn gethostbyaddr(
                 unsafe { sethostent(HOST_STAYOPEN) };
                 return p;
             }
-            cp = unsafe { cp.offset(1) };
+            cp = unsafe { cp.add(1) };
         }
     }
 
@@ -376,7 +376,7 @@ pub unsafe extern "C" fn gethostbyname(name: *const c_char) -> *mut hostent {
                 unsafe { sethostent(HOST_STAYOPEN) };
                 return p;
             }
-            cp = unsafe { cp.offset(1) };
+            cp = unsafe { cp.add(1) };
         }
     }
 
@@ -542,7 +542,7 @@ pub unsafe extern "C" fn getprotobyname(name: *const c_char) -> *mut protoent {
                 unsafe { setprotoent(PROTO_STAYOPEN) };
                 return p;
             }
-            cp = unsafe { cp.offset(1) };
+            cp = unsafe { cp.add(1) };
         }
     }
     unsafe { setprotoent(PROTO_STAYOPEN) };

src/header/stdio/mod.rs

@@ -478,7 +478,7 @@ pub unsafe extern "C" fn fgets(
         let unget_read_size = cmp::min(left, stream.unget.len());
         for _ in 0..unget_read_size {
             unsafe { *out = stream.unget.pop().unwrap() as c_char };
-            out = unsafe { out.offset(1) };
+            out = unsafe { out.add(1) };
         }
         left -= unget_read_size;
     }

src/header/stdio/scanf.rs

@@ -471,7 +471,7 @@ pub unsafe fn inner_scanf<T: Kind>(
                     {
                         if let Some(ref mut ptr) = ptr {
                             unsafe { **ptr = character as c_char };
-                            *ptr = unsafe { ptr.offset(1) };
+                            *ptr = unsafe { ptr.add(1) };
                             data_stored = true;
                         }
                         // Decrease the width, and read a new character unless the width is 0

src/header/stdlib/mod.rs

@@ -372,7 +372,7 @@ pub unsafe extern "C" fn exit(status: c_int) -> ! {
     let mut f = core::ptr::from_ref(unsafe { &__fini_array_end });
     #[allow(clippy::op_ref)]
     while f > &raw const __fini_array_start {
-        f = unsafe { f.offset(-1) };
+        f = unsafe { f.sub(1) };
         (unsafe { *f })();
     }
 
@@ -538,7 +538,7 @@ pub unsafe extern "C" fn initstate(seed: c_uint, state: *mut c_char, size: size_
             _ => 63,
         };
 
-        random_state.x_ptr = unsafe { (state.cast::<[u8; 4]>()).offset(1) };
+        random_state.x_ptr = unsafe { (state.cast::<[u8; 4]>()).add(1) };
         unsafe { random_state.seed(seed) };
         unsafe { random_state.save() };
 
@@ -1378,7 +1378,7 @@ pub unsafe fn detect_base(s: *const c_char) -> Option<(c_int, isize)> {
     match first {
         0 => None,
         b'0' => {
-            let second = unsafe { *s.offset(1) } as u8;
+            let second = unsafe { *s.add(1) } as u8;
             if second == b'X' || second == b'x' {
                 Some((16, 2))
             } else if (b'0'..=b'7').contains(&second) {
@@ -1394,7 +1394,7 @@ pub unsafe fn detect_base(s: *const c_char) -> Option<(c_int, isize)> {
 
 pub unsafe fn convert_octal(s: *const c_char) -> Option<(c_ulong, isize, bool)> {
     if unsafe { *s } != 0 && unsafe { *s } == ByteLiteral::cast_cchar(b'0') {
-        if let Some((val, idx, overflow)) = unsafe { convert_integer(s.offset(1), 8) } {
+        if let Some((val, idx, overflow)) = unsafe { convert_integer(s.add(1), 8) } {
             Some((val, idx + 1, overflow))
         } else {
             // in case the prefix is not actually a prefix
@@ -1407,11 +1407,11 @@ pub unsafe fn convert_octal(s: *const c_char) -> Option<(c_ulong, isize, bool)>
 
 pub unsafe fn convert_hex(s: *const c_char) -> Option<(c_ulong, isize, bool)> {
     if (unsafe { *s } != 0 && unsafe { *s } == ByteLiteral::cast_cchar(b'0'))
-        && (unsafe { *s.offset(1) } != 0
-            && (unsafe { *s.offset(1) } == ByteLiteral::cast_cchar(b'x')
-                || unsafe { *s.offset(1) } == ByteLiteral::cast_cchar(b'X')))
+        && (unsafe { *s.add(1) } != 0
+            && (unsafe { *s.add(1) } == ByteLiteral::cast_cchar(b'x')
+                || unsafe { *s.add(1) } == ByteLiteral::cast_cchar(b'X')))
     {
-        unsafe { convert_integer(s.offset(2), 16) }
+        unsafe { convert_integer(s.add(2), 16) }
             .map(|(val, idx, overflow)| (val, idx + 2, overflow))
     } else {
         unsafe { convert_integer(s, 16) }

src/header/stdlib/random.rs

@@ -44,13 +44,13 @@ impl State {
 
         let stash_value: u32 =
             (u32::from(self.n) << 16) | (u32::from(self.i) << 8) | u32::from(self.j);
-        unsafe { *self.x_ptr.offset(-1) = stash_value.to_ne_bytes() };
-        unsafe { self.x_ptr.offset(-1) }
+        unsafe { *self.x_ptr.sub(1) = stash_value.to_ne_bytes() };
+        unsafe { self.x_ptr.sub(1) }
     }
 
     pub unsafe fn load(&mut self, state_ptr: *mut [u8; 4]) {
         let stash_value = u32::from_ne_bytes(unsafe { *state_ptr });
-        self.x_ptr = unsafe { state_ptr.offset(1) };
+        self.x_ptr = unsafe { state_ptr.add(1) };
 
         /* This calculation of n does not have a bit mask in the musl
          * original, in principle resulting in a u16, but obtaining a value

src/header/string/mod.rs

@@ -82,8 +82,8 @@ pub unsafe extern "C" fn memcmp(s1: *const c_void, s2: *const c_void, n: size_t)
             }
             unreachable!()
         }
-        a = unsafe { a.offset(1) };
-        b = unsafe { b.offset(1) };
+        a = unsafe { a.add(1) };
+        b = unsafe { b.add(1) };
     }
 
     let mut a = a.cast::<u8>();
@@ -92,8 +92,8 @@ pub unsafe extern "C" fn memcmp(s1: *const c_void, s2: *const c_void, n: size_t)
         if unsafe { *a } != unsafe { *b } {
             return c_int::from(unsafe { *a }) - c_int::from(unsafe { *b });
         }
-        a = unsafe { a.offset(1) };
-        b = unsafe { b.offset(1) };
+        a = unsafe { a.add(1) };
+        b = unsafe { b.add(1) };
     }
     0
 }
@@ -354,7 +354,7 @@ pub unsafe fn inner_strspn(s1: *const c_char, s2: *const c_char, cmp: bool) -> s
 
     while unsafe { *s2 } != 0 {
         set.insert(unsafe { *s2 } as usize);
-        s2 = unsafe { s2.offset(1) };
+        s2 = unsafe { s2.add(1) };
     }
 
     let mut i = 0;
@@ -363,7 +363,7 @@ pub unsafe fn inner_strspn(s1: *const c_char, s2: *const c_char, cmp: bool) -> s
             break;
         }
         i += 1;
-        s1 = unsafe { s1.offset(1) };
+        s1 = unsafe { s1.add(1) };
     }
     i
 }
@@ -638,7 +638,7 @@ unsafe fn inner_strstr(
             i += 1;
         }
 
-        haystack = unsafe { haystack.offset(1) };
+        haystack = unsafe { haystack.add(1) };
     }
     ptr::null_mut()
 }

src/header/sys_time/mod.rs

@@ -127,12 +127,12 @@ pub unsafe extern "C" fn utimes(path: *const c_char, times: *const timeval) -> c
     } else {
         Some([
             timespec {
-                tv_sec: unsafe { (*times.offset(0)).tv_sec },
-                tv_nsec: c_long::from(unsafe { (*times.offset(0)).tv_usec }) * 1000,
+                tv_sec: unsafe { (*times).tv_sec },
+                tv_nsec: c_long::from(unsafe { (*times).tv_usec }) * 1000,
             },
             timespec {
-                tv_sec: unsafe { (*times.offset(1)).tv_sec },
-                tv_nsec: c_long::from(unsafe { (*times.offset(1)).tv_usec }) * 1000,
+                tv_sec: unsafe { (*times.add(1)).tv_sec },
+                tv_nsec: c_long::from(unsafe { (*times.add(1)).tv_usec }) * 1000,
             },
         ])
     };

src/header/time/strftime.rs

@@ -89,17 +89,17 @@ pub unsafe fn strftime<W: WriteByte>(w: &mut W, format: *const c_char, t: *const
             // If the character isn't '%', just copy it out.
             if unsafe { *format } as u8 != b'%' {
                 w!(byte unsafe { *format } as u8);
-                format = unsafe { format.offset(1) };
+                format = unsafe { format.add(1) };
                 continue;
             }
 
             // Skip '%'
-            format = unsafe { format.offset(1) };
+            format = unsafe { format.add(1) };
 
             // POSIX says '%E' and '%O' can modify numeric formats for locales,
             // but we ignore them in this minimal "C" locale approach.
             if unsafe { *format } as u8 == b'E' || unsafe { *format } as u8 == b'O' {
-                format = unsafe { format.offset(1) };
+                format = unsafe { format.add(1) };
             }
 
             match unsafe { *format } as u8 {
@@ -270,7 +270,7 @@ pub unsafe fn strftime<W: WriteByte>(w: &mut W, format: *const c_char, t: *const
             }
 
             // Move past the format specifier
-            format = unsafe { format.offset(1) };
+            format = unsafe { format.add(1) };
         }
         true
     }

src/header/unistd/mod.rs

@@ -604,7 +604,7 @@ pub unsafe extern "C" fn gethostname(mut name: *mut c_char, mut len: size_t) ->
             break;
         }
 
-        name = unsafe { name.offset(1) };
+        name = unsafe { name.add(1) };
     }
     0
 }

src/header/wchar/mod.rs

@@ -650,7 +650,7 @@ pub unsafe extern "C" fn wcsnlen(mut s: *const wchar_t, maxlen: size_t) -> size_
         }
 
         len += 1;
-        s = unsafe { s.offset(1) };
+        s = unsafe { s.add(1) };
     }
 
     len

src/platform/mod.rs

@@ -230,7 +230,7 @@ impl Read for UnsafeStringReader {
                 }
 
                 *inner = *self.0;
-                self.0 = self.0.offset(1);
+                self.0 = self.0.add(1);
             }
             Ok(buf.len())
         }

src/start.rs

@@ -257,7 +257,7 @@ pub unsafe extern "C" fn relibc_start_v1(
         #[allow(clippy::op_ref)]
         while f < &raw const __preinit_array_end {
             (unsafe { *f })();
-            f = unsafe { f.offset(1) };
+            f = unsafe { f.add(1) };
         }
     }
 
@@ -267,7 +267,7 @@ pub unsafe extern "C" fn relibc_start_v1(
         #[allow(clippy::op_ref)]
         while f < &raw const __init_array_end {
             (unsafe { *f })();
-            f = unsafe { f.offset(1) };
+            f = unsafe { f.add(1) };
         }
     }