1 files changed, 68 insertions, 0 deletions
diff --git a/tools/power/acpi/common/cmfsize.c b/tools/power/acpi/common/cmfsize.c
new file mode 100644
index 000000000..38f9b9da8
--- /dev/null
+++ b/tools/power/acpi/common/cmfsize.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: cmfsize - Common get file size function
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acapps.h"
+
+#define _COMPONENT          ACPI_TOOLS
+ACPI_MODULE_NAME("cmfsize")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    cm_get_file_size
+ *
+ * PARAMETERS:  file                    - Open file descriptor
+ *
+ * RETURN:      File Size. On error, -1 (ACPI_UINT32_MAX)
+ *
+ * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
+ *              Does not disturb the current file pointer.
+ *
+ ******************************************************************************/
+u32 cm_get_file_size(ACPI_FILE file)
+{
+	long file_size;
+	long current_offset;
+	acpi_status status;
+
+	/* Save the current file pointer, seek to EOF to obtain file size */
+
+	current_offset = ftell(file);
+	if (current_offset < 0) {
+		goto offset_error;
+	}
+
+	status = fseek(file, 0, SEEK_END);
+	if (ACPI_FAILURE(status)) {
+		goto seek_error;
+	}
+
+	file_size = ftell(file);
+	if (file_size < 0) {
+		goto offset_error;
+	}
+
+	/* Restore original file pointer */
+
+	status = fseek(file, current_offset, SEEK_SET);
+	if (ACPI_FAILURE(status)) {
+		goto seek_error;
+	}
+
+	return ((u32)file_size);
+
+offset_error:
+	fprintf(stderr, "Could not get file offset\n");
+	return (ACPI_UINT32_MAX);
+
+seek_error:
+	fprintf(stderr, "Could not set file offset\n");
+	return (ACPI_UINT32_MAX);
+}