config/Data: add method FindBlock()

src/config/Data.cxx

@@ -21,6 +21,8 @@
 #include "Data.hxx"
 #include "Param.hxx"
 #include "Block.hxx"
+#include "system/FatalError.hxx"
+#include "util/StringAPI.hxx"
 
 void
 ConfigData::Clear()
@@ -35,3 +37,21 @@ ConfigData::Clear()
 		i = nullptr;
 	}
 }
+
+const ConfigBlock *
+ConfigData::FindBlock(ConfigBlockOption option,
+		      const char *key, const char *value) const noexcept
+{
+	for (const auto *block = GetBlock(option);
+	     block != nullptr; block = block->next) {
+		const char *value2 = block->GetBlockValue(key);
+		if (value2 == nullptr)
+			FormatFatalError("block without '%s' in line %d",
+					 key, block->line);
+
+		if (StringIsEqual(value2, value))
+			return block;
+	}
+
+	return nullptr;
+}

src/config/Data.hxx

@@ -42,6 +42,10 @@ struct ConfigData {
 	const ConfigBlock *GetBlock(ConfigBlockOption option) const noexcept {
 		return blocks[size_t(option)];
 	}
+
+	gcc_pure
+	const ConfigBlock *FindBlock(ConfigBlockOption option,
+				     const char *key, const char *value) const noexcept;
 };
 
 #endif

src/config/Global.cxx

@@ -89,18 +89,7 @@ config_get_block(ConfigBlockOption option) noexcept
 const ConfigBlock *
 config_find_block(ConfigBlockOption option, const char *key, const char *value)
 {
-	for (const auto *block = config_get_block(option);
-	     block != nullptr; block = block->next) {
-		const char *value2 = block->GetBlockValue(key);
-		if (value2 == nullptr)
-			FormatFatalError("block without '%s' name in line %d",
-					 key, block->line);
-
-		if (strcmp(value2, value) == 0)
-			return block;
-	}
-
-	return nullptr;
+	return config_data.FindBlock(option, key, value);
 }
 
 const char *