ACPICA: Utilities: Introduce acpi_log_error() to improve portability

Invocations like fprintf(stderr) and perror() are not portable, this patch
introduces acpi_log_error() as a replacement, it is implemented using new
portable API - acpi_ut_file_vprintf().

Note that though acpi_os_initialize() need to be invoked prior than using
this new API, since no users are introduced in this patch, such invocations
are not added for applications that link utprint.c in this patch. Futher
patches that introduce users of acpi_log_error() should take care of this.

This patch is only useful for ACPICA applications, most of which are not
shipped in the Linux kernel.

Note that follow-up commits will update acpidump to use this new API to
improve portability. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utdebug.c b/drivers/acpi/acpica/utdebug.c
index 21a20ac5b1e1..e516254c63b2 100644
--- a/drivers/acpi/acpica/utdebug.c
+++ b/drivers/acpi/acpica/utdebug.c
@@ -561,3 +561,29 @@ acpi_ut_ptr_exit(u32 line_number,
 }
 
 #endif
+
+#ifdef ACPI_APPLICATION
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_log_error
+ *
+ * PARAMETERS:  format              - Printf format field
+ *              ...                 - Optional printf arguments
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Print error message to the console, used by applications.
+ *
+ ******************************************************************************/
+
+void ACPI_INTERNAL_VAR_XFACE acpi_log_error(const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	(void)acpi_ut_file_vprintf(ACPI_FILE_ERR, format, args);
+	va_end(args);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_log_error)
+#endif