Add no std if only building mqttv5

Signed-off-by: Marcel Müller <neikos@neikos.email>

9 files changed, 13 insertions, 13 deletions

diff --git a/mqtt-format/src/lib.rs b/mqtt-format/src/lib.rs
index db654df..bed8140 100644
--- a/mqtt-format/src/lib.rs
+++ b/mqtt-format/src/lib.rs
@@ -3,7 +3,7 @@
 //   License, v. 2.0. If a copy of the MPL was not distributed with this
 //   file, You can obtain one at http://mozilla.org/MPL/2.0/.
 //
-
+#![cfg_attr(all(feature = "mqttv5", not(feature = "mqttv3"), not(test)), no_std)]
 #![deny(clippy::disallowed_methods)]
 #![deny(clippy::disallowed_types)]
 
diff --git a/mqtt-format/src/v5/packets/suback.rs b/mqtt-format/src/v5/packets/suback.rs
index 7138e1e..ee185a5 100644
--- a/mqtt-format/src/v5/packets/suback.rs
+++ b/mqtt-format/src/v5/packets/suback.rs
@@ -66,7 +66,7 @@ impl<'i> MSuback<'i> {
 
             // SAFETY: We verified above that the payload slice only contains valid SubackReasonCode
             // bytes
-            let reasons: &[SubackReasonCode] = unsafe { std::mem::transmute(payload) };
+            let reasons: &[SubackReasonCode] = unsafe { core::mem::transmute(payload) };
 
             Ok(Self {
                 packet_identifier,
diff --git a/mqtt-format/src/v5/packets/subscribe.rs b/mqtt-format/src/v5/packets/subscribe.rs
index 04ea2f9..580bbec 100644
--- a/mqtt-format/src/v5/packets/subscribe.rs
+++ b/mqtt-format/src/v5/packets/subscribe.rs
@@ -97,8 +97,8 @@ pub struct Subscriptions<'i> {
     start: &'i [u8],
 }
 
-impl<'i> std::fmt::Debug for Subscriptions<'i> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl<'i> core::fmt::Debug for Subscriptions<'i> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         f.debug_struct("Subscriptions").finish()
     }
 }
diff --git a/mqtt-format/src/v5/packets/unsuback.rs b/mqtt-format/src/v5/packets/unsuback.rs
index 89b0065..d372da0 100644
--- a/mqtt-format/src/v5/packets/unsuback.rs
+++ b/mqtt-format/src/v5/packets/unsuback.rs
@@ -56,7 +56,7 @@ impl<'i> MUnsuback<'i> {
 
             // SAFETY: We verified above that the payload slice only contains valid UnsubackReasonCode
             // bytes
-            let reasons: &[UnsubackReasonCode] = unsafe { std::mem::transmute(payload) };
+            let reasons: &[UnsubackReasonCode] = unsafe { core::mem::transmute(payload) };
 
             Ok(Self {
                 packet_identifier,
diff --git a/mqtt-format/src/v5/packets/unsubscribe.rs b/mqtt-format/src/v5/packets/unsubscribe.rs
index 278871f..eea3850 100644
--- a/mqtt-format/src/v5/packets/unsubscribe.rs
+++ b/mqtt-format/src/v5/packets/unsubscribe.rs
@@ -31,8 +31,8 @@ pub struct Unsubscriptions<'i> {
     start: &'i [u8],
 }
 
-impl<'i> std::fmt::Debug for Unsubscriptions<'i> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl<'i> core::fmt::Debug for Unsubscriptions<'i> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         f.debug_struct("Unsubscriptions").finish()
     }
 }
diff --git a/mqtt-format/src/v5/properties.rs b/mqtt-format/src/v5/properties.rs
index 10e42dd..3ab5796 100644
--- a/mqtt-format/src/v5/properties.rs
+++ b/mqtt-format/src/v5/properties.rs
@@ -53,7 +53,7 @@ macro_rules! define_properties {
         $( $((anker: $prop_anker:literal ))? $prop_name:ident : $prop:ty),* $(,)?
     }) => {
         $(
-            #[doc = std::concat!("Properties helper type for the [", std::stringify!($packettypename), "] type.")]
+            #[doc = core::concat!("Properties helper type for the [", core::stringify!($packettypename), "] type.")]
             #[doc = ""] // newline
         )?
         $(
diff --git a/mqtt-format/src/v5/strings.rs b/mqtt-format/src/v5/strings.rs
index 8d469cd..48fb102 100644
--- a/mqtt-format/src/v5/strings.rs
+++ b/mqtt-format/src/v5/strings.rs
@@ -17,7 +17,7 @@ pub fn parse_string<'i>(input: &mut &'i Bytes) -> MResult<&'i str> {
     winnow::combinator::trace("mqtt_string", |input: &mut &'i Bytes| {
         let maybe_str = length_take(parse_u16).parse_next(input)?;
 
-        std::str::from_utf8(maybe_str)
+        core::str::from_utf8(maybe_str)
             .map_err(|e| ErrMode::from_external_error(input, winnow::error::ErrorKind::Verify, e))
     })
     .parse_next(input)
diff --git a/mqtt-format/src/v5/util.rs b/mqtt-format/src/v5/util.rs
index f0375eb..3b13d50 100644
--- a/mqtt-format/src/v5/util.rs
+++ b/mqtt-format/src/v5/util.rs
@@ -6,7 +6,7 @@
 
 macro_rules! speclink {
     ($anker:literal) => {
-        std::concat!(
+        core::concat!(
             "https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#",
             $anker
         )
@@ -16,7 +16,7 @@ pub(crate) use speclink;
 
 macro_rules! md_speclink {
     ($anker:literal) => {
-        std::concat!(
+        core::concat!(
             "[📖 Specification](",
             $crate::v5::util::speclink!($anker),
             ")"
diff --git a/mqtt-format/src/v5/variable_header.rs b/mqtt-format/src/v5/variable_header.rs
index 22575b2..fca22e0 100644
--- a/mqtt-format/src/v5/variable_header.rs
+++ b/mqtt-format/src/v5/variable_header.rs
@@ -124,8 +124,8 @@ define_properties! {[
 
 pub struct UserProperties<'i>(pub &'i [u8]);
 
-impl<'i> std::fmt::Debug for UserProperties<'i> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl<'i> core::fmt::Debug for UserProperties<'i> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         f.debug_tuple("UserProperties").finish()
     }
 }