20 #define TRACE_SEQ_CHECK(s)						\  argument
22 	if (WARN_ONCE((s)->buffer == TRACE_SEQ_POISON,			\
24 		(s)->state = TRACE_SEQ__BUFFER_POISONED;		\
27 #define TRACE_SEQ_CHECK_RET_N(s, n)		\  argument
29 	TRACE_SEQ_CHECK(s);			\
30 	if ((s)->state != TRACE_SEQ__GOOD)	\
34 #define TRACE_SEQ_CHECK_RET(s)   TRACE_SEQ_CHECK_RET_N(s, )  argument
35 #define TRACE_SEQ_CHECK_RET0(s)  TRACE_SEQ_CHECK_RET_N(s, 0)  argument
39  * @s: a pointer to the trace_seq structure to initialize
41 void trace_seq_init(struct trace_seq *s)  in trace_seq_init()  argument
43 	s->len = 0;  in trace_seq_init()
44 	s->readpos = 0;  in trace_seq_init()
45 	s->buffer_size = TRACE_SEQ_BUF_SIZE;  in trace_seq_init()
46 	s->buffer = malloc(s->buffer_size);  in trace_seq_init()
47 	if (s->buffer != NULL)  in trace_seq_init()
48 		s->state = TRACE_SEQ__GOOD;  in trace_seq_init()
50 		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;  in trace_seq_init()
55  * @s: a pointer to the trace_seq structure to reset
57 void trace_seq_reset(struct trace_seq *s)  in trace_seq_reset()  argument
59 	if (!s)  in trace_seq_reset()
61 	TRACE_SEQ_CHECK(s);  in trace_seq_reset()
62 	s->len = 0;  in trace_seq_reset()
63 	s->readpos = 0;  in trace_seq_reset()
68  * @s: a pointer to the trace_seq to free the buffer
72 void trace_seq_destroy(struct trace_seq *s)  in trace_seq_destroy()  argument
74 	if (!s)  in trace_seq_destroy()
76 	TRACE_SEQ_CHECK_RET(s);  in trace_seq_destroy()
77 	free(s->buffer);  in trace_seq_destroy()
78 	s->buffer = TRACE_SEQ_POISON;  in trace_seq_destroy()
81 static void expand_buffer(struct trace_seq *s)  in expand_buffer()  argument
85 	buf = realloc(s->buffer, s->buffer_size + TRACE_SEQ_BUF_SIZE);  in expand_buffer()
87 		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;  in expand_buffer()
91 	s->buffer = buf;  in expand_buffer()
92 	s->buffer_size += TRACE_SEQ_BUF_SIZE;  in expand_buffer()
97  * @s: trace sequence descriptor
100  * It returns 0 if the trace oversizes the buffer's free
106  * buffer (@s). Then the output may be either used by
110 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)  in trace_seq_printf()  argument
117 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_printf()
119 	len = (s->buffer_size - 1) - s->len;  in trace_seq_printf()
122 	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);  in trace_seq_printf()
126 		expand_buffer(s);  in trace_seq_printf()
130 	s->len += ret;  in trace_seq_printf()
137  * @s: trace sequence descriptor
143  * buffer (@s). Then the output may be either used by
147 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)  in trace_seq_vprintf()  argument
153 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_vprintf()
155 	len = (s->buffer_size - 1) - s->len;  in trace_seq_vprintf()
157 	ret = vsnprintf(s->buffer + s->len, len, fmt, args);  in trace_seq_vprintf()
160 		expand_buffer(s);  in trace_seq_vprintf()
164 	s->len += ret;  in trace_seq_vprintf()
171  * @s: trace sequence descriptor
176  * into a special buffer (@s) for later retrieval by a sequencer
179 int trace_seq_puts(struct trace_seq *s, const char *str)  in trace_seq_puts()  argument
183 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_puts()
187 	while (len > ((s->buffer_size - 1) - s->len))  in trace_seq_puts()
188 		expand_buffer(s);  in trace_seq_puts()
190 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_puts()
192 	memcpy(s->buffer + s->len, str, len);  in trace_seq_puts()
193 	s->len += len;  in trace_seq_puts()
198 int trace_seq_putc(struct trace_seq *s, unsigned char c)  in trace_seq_putc()  argument
200 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_putc()
202 	while (s->len >= (s->buffer_size - 1))  in trace_seq_putc()
203 		expand_buffer(s);  in trace_seq_putc()
205 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_putc()
207 	s->buffer[s->len++] = c;  in trace_seq_putc()
212 void trace_seq_terminate(struct trace_seq *s)  in trace_seq_terminate()  argument
214 	TRACE_SEQ_CHECK_RET(s);  in trace_seq_terminate()
216 	/* There's always one character left on the buffer */  in trace_seq_terminate()
217 	s->buffer[s->len] = 0;  in trace_seq_terminate()
220 int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp)  in trace_seq_do_fprintf()  argument
222 	TRACE_SEQ_CHECK(s);  in trace_seq_do_fprintf()
224 	switch (s->state) {  in trace_seq_do_fprintf()
226 		return fprintf(fp, "%.*s", s->len, s->buffer);  in trace_seq_do_fprintf()
228 		fprintf(fp, "%s\n", "Usage of trace_seq after it was destroyed");  in trace_seq_do_fprintf()
231 		fprintf(fp, "%s\n", "Can't allocate trace_seq buffer memory");  in trace_seq_do_fprintf()
237 int trace_seq_do_printf(struct trace_seq *s)  in trace_seq_do_printf()  argument
239 	return trace_seq_do_fprintf(s, stdout);  in trace_seq_do_printf()