// SPDX-License-Identifier: GPL-2.0#include "util.h"#include "../util/debug.h"#include <stdio.h> /* * Default error logging functions */static int perf_stdio__error(const char *format, va_list args){	fprintf(stderr, "Error:\n");	vfprintf(stderr, format, args);	return 0;} static int perf_stdio__warning(const char *format, va_list args){	if (quiet)		return 0; 	fprintf(stderr, "Warning:\n");	vfprintf(stderr, format, args);	return 0;} static struct perf_error_ops default_eops ={	.error		= perf_stdio__error,	.warning	= perf_stdio__warning,}; static struct perf_error_ops *perf_eops = &default_eops;  int ui__error(const char *format, ...){	int ret;	va_list args; 	va_start(args, format);	ret = perf_eops->error(format, args);	va_end(args); 	return ret;} int ui__warning(const char *format, ...){	int ret;	va_list args;	if (quiet)		return 0; 	va_start(args, format);	ret = perf_eops->warning(format, args);	va_end(args); 	return ret;} /** * perf_error__register - Register error logging functions * @eops: The pointer to error logging function struct * * Register UI-specific error logging functions. Before calling this, * other logging functions should be unregistered, if any. */int perf_error__register(struct perf_error_ops *eops){	if (perf_eops != &default_eops)		return -1; 	perf_eops = eops;	return 0;} /** * perf_error__unregister - Unregister error logging functions * @eops: The pointer to error logging function struct * * Unregister already registered error logging functions. */int perf_error__unregister(struct perf_error_ops *eops){	if (perf_eops != eops)		return -1; 	perf_eops = &default_eops;	return 0;}