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// SPDX-License-Identifier: LGPL-2.1
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <>
#ifndef _TRACE_SEQ_H
#define _TRACE_SEQ_H
#include <stdarg.h>
#include <stdio.h>
/* ----------------------- trace_seq ----------------------- */
#define TRACE_SEQ_BUF_SIZE 4096
enum trace_seq_fail {
* Trace sequences are used to allow a function to call several other functions
* to create a string of data to use (up to a max of PAGE_SIZE).
struct trace_seq {
char *buffer;
unsigned int buffer_size;
unsigned int len;
unsigned int readpos;
enum trace_seq_fail state;
void trace_seq_init(struct trace_seq *s);
void trace_seq_reset(struct trace_seq *s);
void trace_seq_destroy(struct trace_seq *s);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
__attribute__ ((format (printf, 2, 3)));
extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
__attribute__ ((format (printf, 2, 0)));
extern int trace_seq_puts(struct trace_seq *s, const char *str);
extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
extern void trace_seq_terminate(struct trace_seq *s);
extern int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp);
extern int trace_seq_do_printf(struct trace_seq *s);
#endif /* _TRACE_SEQ_H */