core/memory: Migrate over ReadCString() to the Memory class

This only had one usage spot, so this is fairly straightforward to
convert over.

src/core/hle/kernel/svc.cpp

@@ -332,7 +332,9 @@ static ResultCode UnmapMemory(Core::System& system, VAddr dst_addr, VAddr src_ad
 /// Connect to an OS service given the port name, returns the handle to the port to out
 static ResultCode ConnectToNamedPort(Core::System& system, Handle* out_handle,
                                      VAddr port_name_address) {
-    if (!system.Memory().IsValidVirtualAddress(port_name_address)) {
+    auto& memory = system.Memory();
+
+    if (!memory.IsValidVirtualAddress(port_name_address)) {
         LOG_ERROR(Kernel_SVC,
                   "Port Name Address is not a valid virtual address, port_name_address=0x{:016X}",
                   port_name_address);
@@ -341,7 +343,7 @@ static ResultCode ConnectToNamedPort(Core::System& system, Handle* out_handle,
 
     static constexpr std::size_t PortNameMaxLength = 11;
     // Read 1 char beyond the max allowed port name to detect names that are too long.
-    std::string port_name = Memory::ReadCString(port_name_address, PortNameMaxLength + 1);
+    const std::string port_name = memory.ReadCString(port_name_address, PortNameMaxLength + 1);
     if (port_name.size() > PortNameMaxLength) {
         LOG_ERROR(Kernel_SVC, "Port name is too long, expected {} but got {}", PortNameMaxLength,
                   port_name.size());

src/core/memory.cpp

@@ -210,6 +210,21 @@ struct Memory::Impl {
         return nullptr;
     }
 
+    std::string ReadCString(VAddr vaddr, std::size_t max_length) {
+        std::string string;
+        string.reserve(max_length);
+        for (std::size_t i = 0; i < max_length; ++i) {
+            const char c = Read8(vaddr);
+            if (c == '\0') {
+                break;
+            }
+            string.push_back(c);
+            ++vaddr;
+        }
+        string.shrink_to_fit();
+        return string;
+    }
+
     /**
      * Maps a region of pages as a specific type.
      *
@@ -299,6 +314,10 @@ const u8* Memory::GetPointer(VAddr vaddr) const {
     return impl->GetPointer(vaddr);
 }
 
+std::string Memory::ReadCString(VAddr vaddr, std::size_t max_length) {
+    return impl->ReadCString(vaddr, max_length);
+}
+
 void SetCurrentPageTable(Kernel::Process& process) {
     current_page_table = &process.VMManager().page_table;
 
@@ -315,20 +334,6 @@ bool IsKernelVirtualAddress(const VAddr vaddr) {
     return KERNEL_REGION_VADDR <= vaddr && vaddr < KERNEL_REGION_END;
 }
 
-std::string ReadCString(VAddr vaddr, std::size_t max_length) {
-    std::string string;
-    string.reserve(max_length);
-    for (std::size_t i = 0; i < max_length; ++i) {
-        char c = Read8(vaddr);
-        if (c == '\0')
-            break;
-        string.push_back(c);
-        ++vaddr;
-    }
-    string.shrink_to_fit();
-    return string;
-}
-
 void RasterizerMarkRegionCached(VAddr vaddr, u64 size, bool cached) {
     if (vaddr == 0) {
         return;

src/core/memory.h

@@ -152,6 +152,23 @@ public:
      */
     const u8* GetPointer(VAddr vaddr) const;
 
+    /**
+     * Reads a null-terminated string from the given virtual address.
+     * This function will continually read characters until either:
+     *
+     * - A null character ('\0') is reached.
+     * - max_length characters have been read.
+     *
+     * @note The final null-terminating character (if found) is not included
+     *       in the returned string.
+     *
+     * @param vaddr      The address to begin reading the string from.
+     * @param max_length The maximum length of the string to read in characters.
+     *
+     * @returns The read string.
+     */
+    std::string ReadCString(VAddr vaddr, std::size_t max_length);
+
 private:
     struct Impl;
     std::unique_ptr<Impl> impl;
@@ -182,8 +199,6 @@ void WriteBlock(VAddr dest_addr, const void* src_buffer, std::size_t size);
 void ZeroBlock(const Kernel::Process& process, VAddr dest_addr, std::size_t size);
 void CopyBlock(VAddr dest_addr, VAddr src_addr, std::size_t size);
 
-std::string ReadCString(VAddr vaddr, std::size_t max_length);
-
 /**
  * Mark each page touching the region as cached.
  */