22 #define TRACE_SEQ_CHECK(s)						\  argument
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)		\  argument
31 	TRACE_SEQ_CHECK(s);			\
32 	if ((s)->state != TRACE_SEQ__GOOD)	\
36 #define TRACE_SEQ_CHECK_RET(s)   TRACE_SEQ_CHECK_RET_N(s, )  argument
37 #define TRACE_SEQ_CHECK_RET0(s)  TRACE_SEQ_CHECK_RET_N(s, 0)  argument
41  * @s: a pointer to the trace_seq structure to initialize
43 void trace_seq_init(struct trace_seq *s)  in trace_seq_init()  argument
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()
57  * @s: a pointer to the trace_seq structure to reset
59 void trace_seq_reset(struct trace_seq *s)  in trace_seq_reset()  argument
61 	if (!s)  in trace_seq_reset()
63 	TRACE_SEQ_CHECK(s);  in trace_seq_reset()
64 	s->len = 0;  in trace_seq_reset()
65 	s->readpos = 0;  in trace_seq_reset()
70  * @s: a pointer to the trace_seq to free the buffer
74 void trace_seq_destroy(struct trace_seq *s)  in trace_seq_destroy()  argument
76 	if (!s)  in trace_seq_destroy()
78 	TRACE_SEQ_CHECK_RET(s);  in trace_seq_destroy()
79 	free(s->buffer);  in trace_seq_destroy()
80 	s->buffer = TRACE_SEQ_POISON;  in trace_seq_destroy()
83 static void expand_buffer(struct trace_seq *s)  in expand_buffer()  argument
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()
99  * @s: trace sequence descriptor
102  * It returns 0 if the trace oversizes the buffer's free
109  * buffer (@s). Then the output may be either used by
113 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)  in trace_seq_printf()  argument
120 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_printf()
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()
129 		expand_buffer(s);  in trace_seq_printf()
134 		s->len += ret;  in trace_seq_printf()
141  * @s: trace sequence descriptor
144  * It returns 0 if the trace oversizes the buffer's free
151  * buffer (@s). Then the output may be either used by
155 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)  in trace_seq_vprintf()  argument
161 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_vprintf()
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()
168 		expand_buffer(s);  in trace_seq_vprintf()
173 		s->len += ret;  in trace_seq_vprintf()
180  * @s: trace sequence descriptor
185  * into a special buffer (@s) for later retrieval by a sequencer
188 int trace_seq_puts(struct trace_seq *s, const char *str)  in trace_seq_puts()  argument
192 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_puts()
196 	while (len > ((s->buffer_size - 1) - s->len))  in trace_seq_puts()
197 		expand_buffer(s);  in trace_seq_puts()
199 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_puts()
201 	memcpy(s->buffer + s->len, str, len);  in trace_seq_puts()
202 	s->len += len;  in trace_seq_puts()
207 int trace_seq_putc(struct trace_seq *s, unsigned char c)  in trace_seq_putc()  argument
209 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_putc()
211 	while (s->len >= (s->buffer_size - 1))  in trace_seq_putc()
212 		expand_buffer(s);  in trace_seq_putc()
214 	TRACE_SEQ_CHECK_RET0(s);  in trace_seq_putc()
216 	s->buffer[s->len++] = c;  in trace_seq_putc()
221 void trace_seq_terminate(struct trace_seq *s)  in trace_seq_terminate()  argument
223 	TRACE_SEQ_CHECK_RET(s);  in trace_seq_terminate()
225 	/* There's always one character left on the buffer */  in trace_seq_terminate()
226 	s->buffer[s->len] = 0;  in trace_seq_terminate()
229 int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp)  in trace_seq_do_fprintf()  argument
231 	TRACE_SEQ_CHECK(s);  in trace_seq_do_fprintf()
233 	switch (s->state) {  in trace_seq_do_fprintf()
235 		return fprintf(fp, "%.*s", s->len, s->buffer);  in trace_seq_do_fprintf()
237 		fprintf(fp, "%s\n", "Usage of trace_seq after it was destroyed");  in trace_seq_do_fprintf()
240 		fprintf(fp, "%s\n", "Can't allocate trace_seq buffer memory");  in trace_seq_do_fprintf()
246 int trace_seq_do_printf(struct trace_seq *s)  in trace_seq_do_printf()  argument
248 	return trace_seq_do_fprintf(s, stdout);  in trace_seq_do_printf()