Use bool + size_t for os_version_str, return true on success

Abort the test if the function fails, as the version output will be undefined in that case.

src/base/system.cpp

@@ -4186,7 +4186,7 @@ int secure_rand_below(int below)
 	}
 }
 
-int os_version_str(char *version, int length)
+bool os_version_str(char *version, size_t length)
 {
 #if defined(CONF_FAMILY_WINDOWS)
 	const WCHAR *module_path = L"kernel32.dll";
@@ -4194,20 +4194,20 @@ int os_version_str(char *version, int length)
 	DWORD size = GetFileVersionInfoSizeW(module_path, &handle);
 	if(!size)
 	{
-		return 1;
+		return false;
 	}
 	void *data = malloc(size);
 	if(!GetFileVersionInfoW(module_path, handle, size, data))
 	{
 		free(data);
-		return 1;
+		return false;
 	}
 	VS_FIXEDFILEINFO *fileinfo;
 	UINT unused;
 	if(!VerQueryValueW(data, L"\\", (void **)&fileinfo, &unused))
 	{
 		free(data);
-		return 1;
+		return false;
 	}
 	str_format(version, length, "Windows %hu.%hu.%hu.%hu",
 		HIWORD(fileinfo->dwProductVersionMS),
@@ -4215,12 +4215,12 @@ int os_version_str(char *version, int length)
 		HIWORD(fileinfo->dwProductVersionLS),
 		LOWORD(fileinfo->dwProductVersionLS));
 	free(data);
-	return 0;
+	return true;
 #else
 	struct utsname u;
 	if(uname(&u))
 	{
-		return 1;
+		return false;
 	}
 	char extra[128];
 	extra[0] = 0;
@@ -4261,7 +4261,7 @@ int os_version_str(char *version, int length)
 	} while(false);
 
 	str_format(version, length, "%s %s (%s, %s)%s", u.sysname, u.release, u.machine, u.version, extra);
-	return 0;
+	return true;
 #endif
 }
 

src/base/system.h

@@ -2552,19 +2552,15 @@ int secure_rand();
 */
 int secure_rand_below(int below);
 
-/*
-	Function: os_version_str
-		Returns a human-readable version string of the operating system
-
-	Parameters:
-		version - Buffer to use for the output.
-		length - Length of the output buffer.
-
-	Returns:
-		0 - Success in getting the version.
-		1 - Failure in getting the version.
-*/
-int os_version_str(char *version, int length);
+/**
+ * Returns a human-readable version string of the operating system.
+ *
+ * @param version Buffer to use for the output.
+ * @param length Length of the output buffer.
+ *
+ * @return true on success, false on failure.
+ */
+bool os_version_str(char *version, size_t length);
 
 #if defined(CONF_EXCEPTION_HANDLING)
 void init_exception_handler();

src/engine/shared/engine.cpp

@@ -73,7 +73,7 @@ public:
 #endif
 
 			char aVersionStr[128];
-			if(!os_version_str(aVersionStr, sizeof(aVersionStr)))
+			if(os_version_str(aVersionStr, sizeof(aVersionStr)))
 			{
 				dbg_msg("engine", "operating system version: %s", aVersionStr);
 			}

src/test/os.cpp

@@ -6,6 +6,6 @@
 TEST(Os, VersionStr)
 {
 	char aVersion[128];
-	EXPECT_FALSE(os_version_str(aVersion, sizeof(aVersion)));
+	ASSERT_TRUE(os_version_str(aVersion, sizeof(aVersion)));
 	EXPECT_STRNE(aVersion, "");
 }