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