1 // SPDX-License-Identifier: LGPL-2.1
6 #include "trace-seq.h"
14 #include "event-parse.h"
15 #include "event-utils.h"
21 #define TRACE_SEQ_POISON	((void *)0xdeadbeef)
22 #define TRACE_SEQ_CHECK(s)						\
24 	if (WARN_ONCE((s)->buffer == TRACE_SEQ_POISON,			\
26 		(s)->state = TRACE_SEQ__BUFFER_POISONED;		\
29 #define TRACE_SEQ_CHECK_RET_N(s, n)		\
32 	if ((s)->state != TRACE_SEQ__GOOD)	\
36 #define TRACE_SEQ_CHECK_RET(s)   TRACE_SEQ_CHECK_RET_N(s, )
37 #define TRACE_SEQ_CHECK_RET0(s)  TRACE_SEQ_CHECK_RET_N(s, 0)
40  * trace_seq_init - initialize the trace_seq structure
45 	s->len = 0;  in trace_seq_init()
46 	s->readpos = 0;  in trace_seq_init()
47 	s->buffer_size = TRACE_SEQ_BUF_SIZE;  in trace_seq_init()
48 	s->buffer = malloc(s->buffer_size);  in trace_seq_init()
49 	if (s->buffer != NULL)  in trace_seq_init()
50 		s->state = TRACE_SEQ__GOOD;  in trace_seq_init()
52 		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;  in trace_seq_init()
56  * trace_seq_reset - re-initialize the trace_seq structure
64 	s->len = 0;  in trace_seq_reset()
65 	s->readpos = 0;  in trace_seq_reset()
69  * trace_seq_destroy - free up memory of a trace_seq
79 	free(s->buffer);  in trace_seq_destroy()
80 	s->buffer = TRACE_SEQ_POISON;  in trace_seq_destroy()
87 	buf = realloc(s->buffer, s->buffer_size + TRACE_SEQ_BUF_SIZE);  in expand_buffer()
89 		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;  in expand_buffer()
93 	s->buffer = buf;  in expand_buffer()
94 	s->buffer_size += TRACE_SEQ_BUF_SIZE;  in expand_buffer()
98  * trace_seq_printf - sequence printing of trace information
103  * space, the number of characters printed, or a negative
106  * The tracer may use either sequence operations or its own
110  * the sequencer or pulled into another buffer.
116 	int len;  in trace_seq_printf()  local
122 	len = (s->buffer_size - 1) - s->len;  in trace_seq_printf()
125 	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);  in trace_seq_printf()
128 	if (ret >= len) {  in trace_seq_printf()
134 		s->len += ret;  in trace_seq_printf()
140  * trace_seq_vprintf - sequence printing of trace information
145  * space, the number of characters printed, or a negative
148  * The tracer may use either sequence operations or its own
152  * the sequencer or pulled into another buffer.
157 	int len;  in trace_seq_vprintf()  local
163 	len = (s->buffer_size - 1) - s->len;  in trace_seq_vprintf()
165 	ret = vsnprintf(s->buffer + s->len, len, fmt, args);  in trace_seq_vprintf()
167 	if (ret >= len) {  in trace_seq_vprintf()
173 		s->len += ret;  in trace_seq_vprintf()
179  * trace_seq_puts - trace sequence printing of simple string
183  * The tracer may use either the sequence operations or its own
186  * or other mechanism.
190 	int len;  in trace_seq_puts()  local
194 	len = strlen(str);  in trace_seq_puts()
196 	while (len > ((s->buffer_size - 1) - s->len))  in trace_seq_puts()
201 	memcpy(s->buffer + s->len, str, len);  in trace_seq_puts()
202 	s->len += len;  in trace_seq_puts()
204 	return len;  in trace_seq_puts()
211 	while (s->len >= (s->buffer_size - 1))  in trace_seq_putc()
216 	s->buffer[s->len++] = c;  in trace_seq_putc()
226 	s->buffer[s->len] = 0;  in trace_seq_terminate()
233 	switch (s->state) {  in trace_seq_do_fprintf()
235 		return fprintf(fp, "%.*s", s->len, s->buffer);  in trace_seq_do_fprintf()
243 	return -1;  in trace_seq_do_fprintf()