userlandfs: use std::bitset for FSCapabilities

gcc 13 is confused by the custom bitset implementation, so use the C++
standard one instead.

However, this results in including the C++ <string> header in kernel
code. This doesn't work for gcc2, because of two problems:

- That header includes a declaration of atomic_add that doesn't match
the one in SupportsDefs.h (which can in some cases replace the function
with a #define for an inline version). Adjust the header to use the
be a problem because it creates a risk of circular inclusions.
Standard C++ headers shouldn't depend on BeAPI ones.
- It also leads to the inclusion of iostream which defined lock and
unlock functions in the global namespace. We don't want these, and they
are not part of the C++ standard, so just remove them.

Ideally we could use std::hash for the GetHashCode implementation, but
that doesn't work because it depends on an helper function that's in
libstdc++, and we can't link that from kernel add-ons.

Change-Id: Iee07280beb4dddf7a9b6160e37f3b816e4de89ae
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6663
Reviewed-by: Niels Sascha Reedijk <niels.reedijk@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

headers/cpp/iostream.h

@@ -271,11 +271,6 @@ __asm__ ("__IO_clog")
 #endif
 ;
 
-extern istream& lock(istream& ins);
-extern istream& unlock(istream& ins);
-extern ostream& lock(ostream& outs);
-extern ostream& unlock(ostream& outs);
-
 struct Iostream_init { } ;  // Compatibility hack for AT&T library.
 
 inline ios& dec(ios& i)

headers/cpp/std/bastring.h

@@ -66,8 +66,10 @@ extern void __length_error (const char *);
 #endif
 
 #ifdef __HAIKU__
+#ifndef atomic_add
 extern "C" __haiku_int32 atomic_add(__haiku_int32* value,
 	__haiku_int32 addvalue);
+#endif
 #endif	/* __HAIKU__ */
 
 template <class charT, class traits = string_char_traits<charT>,

headers/private/userlandfs/private/FSCapabilities.h

@@ -8,6 +8,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include <bitset>
+
 #include "Debug.h"
 
 enum client_fs_type {
@@ -148,7 +150,7 @@ namespace UserlandFSUtil {
 
 template<const int CapabilityCount>
 struct FSCapabilitiesBase {
-			uint8				capabilities[(CapabilityCount + 7) / 8];
+			std::bitset<CapabilityCount>	capabilities;
 
 	inline	void				ClearAll();
 
@@ -171,7 +173,7 @@ template<const int CapabilityCount>
 inline void
 FSCapabilitiesBase<CapabilityCount>::ClearAll()
 {
-	memset(capabilities, 0, sizeof(capabilities));
+	capabilities.reset();
 }
 
 
@@ -183,11 +185,7 @@ FSCapabilitiesBase<CapabilityCount>::Set(uint32 capability, bool set)
 	if (capability >= CapabilityCount)
 		return;
 
-	uint8 flag = uint8(1 << (capability % 8));
-	if (set)
-		capabilities[capability / 8] |= flag;
-	else
-		capabilities[capability / 8] &= ~flag;
+	capabilities.set(capability, set);
 }
 
 
@@ -196,7 +194,10 @@ template<const int CapabilityCount>
 inline void
 FSCapabilitiesBase<CapabilityCount>::Clear(uint32 capability)
 {
-	Set(capability, false);
+	if (capability >= CapabilityCount)
+		return;
+
+	capabilities.reset(capability);
 }
 
 
@@ -208,8 +209,7 @@ FSCapabilitiesBase<CapabilityCount>::Get(uint32 capability) const
 	if (capability >= CapabilityCount)
 		return false;
 
-	uint8 flag = uint8(1 << (capability % 8));
-	return (capabilities[capability / 8] & flag);
+	return capabilities.test(capability);
 }
 
 
@@ -218,12 +218,10 @@ template<const int CapabilityCount>
 inline uint32
 FSCapabilitiesBase<CapabilityCount>::GetHashCode() const
 {
-	uint32 hashCode = 0;
-	int byteCount = sizeof(capabilities);
-	for (int i = 0; i < byteCount; i++)
-		hashCode = hashCode * 37 + capabilities[i];
-
-	return hashCode;
+	uint32 hash = 0;
+	for (int i = 0; i < CapabilityCount; i++)
+		hash ^= capabilities.test(i) << (i % 32);
+	return hash;
 }
 
 
@@ -233,13 +231,7 @@ inline bool
 FSCapabilitiesBase<CapabilityCount>::operator==(
 	const FSCapabilitiesBase<CapabilityCount>& other) const
 {
-	int byteCount = sizeof(capabilities);
-	for (int i = 0; i < byteCount; i++) {
-		if (capabilities[i] != other.capabilities[i])
-			return false;
-	}
-
-	return true;
+	return capabilities == other.capabilities;
 }
 
 
@@ -249,12 +241,7 @@ inline void
 FSCapabilitiesBase<CapabilityCount>::Dump() const
 {
 	D(
-		char buffer[128];
-		int byteCount = sizeof(capabilities);
-		for (int i = 0; i < byteCount; i++)
-			sprintf(buffer + 2 * i, "%02x", (int)capabilities[i]);
-
-		PRINT(("FSCapabilities[%s]\n", buffer));
+		PRINT(("FSCapabilities[%s]\n", capabilities.to_string().c_str()));
 	)
 }
 

src/add-ons/kernel/file_systems/userlandfs/server/beos/Jamfile

@@ -33,5 +33,5 @@ SharedLibrary libuserlandfs_beos_kernel.so
 
 	:
 	<nogrist>userlandfs_server
-	[ TargetLibsupc++ ] libbsd.so
+	[ TargetLibsupc++ ] [ TargetLibstdc++ ] libbsd.so
 ;

src/add-ons/kernel/file_systems/userlandfs/server/fuse/Jamfile

@@ -36,7 +36,7 @@ SharedLibrary libuserlandfs_fuse.so
 	FUSEVolume.cpp
 	mime_ext_table.c
 	:
-	<nogrist>userlandfs_server shared be [ TargetLibsupc++ ]
+	<nogrist>userlandfs_server shared be [ TargetLibsupc++ ] [ TargetLibstdc++ ]
 ;
 
 SEARCH on [ FGristFiles mime_ext_table.c ]

src/add-ons/kernel/file_systems/userlandfs/server/haiku/Jamfile

@@ -51,7 +51,7 @@ SharedLibrary libuserlandfs_haiku_kernel.so
 	:
 	<nogrist>userlandfs_server
 	be	# for BLocker only
-	[ TargetLibsupc++ ]
+	[ TargetLibsupc++ ] [ TargetLibstdc++ ]
 ;