1 // SPDX-License-Identifier: GPL-2.0
31  * seq_buf_can_fit - can the new data fit in the current buffer?
32  * @s: the seq_buf descriptor
35  * Returns: true if there's enough unused space in the seq_buf buffer
38 static bool seq_buf_can_fit(struct seq_buf *s, size_t len)  in seq_buf_can_fit()  argument
40 	return s->len + len <= s->size;  in seq_buf_can_fit()
44  * seq_buf_print_seq - move the contents of seq_buf into a seq_file
46  * @s: the seq_buf descriptor that is the source.
48  * Returns: zero on success, non-zero otherwise.
50 int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s)  in seq_buf_print_seq()  argument
52 	unsigned int len = seq_buf_used(s);  in seq_buf_print_seq()
54 	return seq_write(m, s->buffer, len);  in seq_buf_print_seq()
58  * seq_buf_vprintf - sequence printing of information.
59  * @s: seq_buf descriptor
65  * Returns: zero on success, -1 on overflow.
67 int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args)  in seq_buf_vprintf()  argument
71 	WARN_ON(s->size == 0);  in seq_buf_vprintf()
73 	if (s->len < s->size) {  in seq_buf_vprintf()
74 		len = vsnprintf(s->buffer + s->len, s->size - s->len, fmt, args);  in seq_buf_vprintf()
75 		if (s->len + len < s->size) {  in seq_buf_vprintf()
76 			s->len += len;  in seq_buf_vprintf()
80 	seq_buf_set_overflow(s);  in seq_buf_vprintf()
81 	return -1;  in seq_buf_vprintf()
85  * seq_buf_printf - sequence printing of information
86  * @s: seq_buf descriptor
91  * Returns: zero on success, -1 on overflow.
93 int seq_buf_printf(struct seq_buf *s, const char *fmt, ...)  in seq_buf_printf()  argument
99 	ret = seq_buf_vprintf(s, fmt, ap);  in seq_buf_printf()
107  * seq_buf_do_printk - printk() seq_buf line by line
108  * @s: seq_buf descriptor
111  * printk()-s a multi-line sequential buffer line by line. The function
112  * makes sure that the buffer in @s is NUL-terminated and safe to read
115 void seq_buf_do_printk(struct seq_buf *s, const char *lvl)  in seq_buf_do_printk()  argument
119 	if (s->size == 0 || s->len == 0)  in seq_buf_do_printk()
122 	start = seq_buf_str(s);  in seq_buf_do_printk()
124 		int len = lf - start + 1;  in seq_buf_do_printk()
126 		printk("%s%.*s", lvl, len, start);  in seq_buf_do_printk()
131 	if (start < s->buffer + s->len)  in seq_buf_do_printk()
132 		printk("%s%s\n", lvl, start);  in seq_buf_do_printk()
138  * seq_buf_bprintf - Write the printf string from binary arguments
139  * @s: seq_buf descriptor
152  * Returns: zero on success, -1 on overflow.
154 int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary)  in seq_buf_bprintf()  argument
156 	unsigned int len = seq_buf_buffer_left(s);  in seq_buf_bprintf()
159 	WARN_ON(s->size == 0);  in seq_buf_bprintf()
161 	if (s->len < s->size) {  in seq_buf_bprintf()
162 		ret = bstr_printf(s->buffer + s->len, len, fmt, binary);  in seq_buf_bprintf()
163 		if (s->len + ret < s->size) {  in seq_buf_bprintf()
164 			s->len += ret;  in seq_buf_bprintf()
168 	seq_buf_set_overflow(s);  in seq_buf_bprintf()
169 	return -1;  in seq_buf_bprintf()
174  * seq_buf_puts - sequence printing of simple string
175  * @s: seq_buf descriptor
180  * Returns: zero on success, -1 on overflow.
182 int seq_buf_puts(struct seq_buf *s, const char *str)  in seq_buf_puts()  argument
186 	WARN_ON(s->size == 0);  in seq_buf_puts()
191 	if (seq_buf_can_fit(s, len)) {  in seq_buf_puts()
192 		memcpy(s->buffer + s->len, str, len);  in seq_buf_puts()
194 		s->len += len - 1;  in seq_buf_puts()
197 	seq_buf_set_overflow(s);  in seq_buf_puts()
198 	return -1;  in seq_buf_puts()
203  * seq_buf_putc - sequence printing of simple character
204  * @s: seq_buf descriptor
209  * Returns: zero on success, -1 on overflow.
211 int seq_buf_putc(struct seq_buf *s, unsigned char c)  in seq_buf_putc()  argument
213 	WARN_ON(s->size == 0);  in seq_buf_putc()
215 	if (seq_buf_can_fit(s, 1)) {  in seq_buf_putc()
216 		s->buffer[s->len++] = c;  in seq_buf_putc()
219 	seq_buf_set_overflow(s);  in seq_buf_putc()
220 	return -1;  in seq_buf_putc()
225  * seq_buf_putmem - write raw data into the sequence buffer
226  * @s: seq_buf descriptor
234  * Returns: zero on success, -1 on overflow.
236 int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len)  in seq_buf_putmem()  argument
238 	WARN_ON(s->size == 0);  in seq_buf_putmem()
240 	if (seq_buf_can_fit(s, len)) {  in seq_buf_putmem()
241 		memcpy(s->buffer + s->len, mem, len);  in seq_buf_putmem()
242 		s->len += len;  in seq_buf_putmem()
245 	seq_buf_set_overflow(s);  in seq_buf_putmem()
246 	return -1;  in seq_buf_putmem()
253  * seq_buf_putmem_hex - write raw memory into the buffer in ASCII hex
254  * @s: seq_buf descriptor
262  * Returns: zero on success, -1 on overflow.
264 int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,  argument
272 	WARN_ON(s->size == 0);
281 		for (i = start_len-1, j = 0; i >= 0; i--) {
292 		seq_buf_putmem(s, hex, j);
293 		if (seq_buf_has_overflowed(s))
294 			return -1;
296 		len -= start_len;
303  * seq_buf_path - copy a path into the sequence buffer
304  * @s: seq_buf descriptor
310  * Returns: the number of written bytes on success, -1 on overflow.
312 int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc)  argument
315 	size_t size = seq_buf_get_buf(s, &buf);
316 	int res = -1;
318 	WARN_ON(s->size == 0);
325 				res = end - buf;
328 	seq_buf_commit(s, res);
334  * seq_buf_to_user - copy the sequence buffer to user space
335  * @s: seq_buf descriptor
342  * or until it reaches the end of the content in the buffer (@s->len),
349  * On failure it returns -EBUSY if all of the content in the
351  * sequence (@s->len == @start).
353  * Returns -EFAULT if the copy to userspace fails.
355 int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, size_t start, int cnt)  argument
363 	len = seq_buf_used(s);
366 		return -EBUSY;
368 	len -= start;
371 	ret = copy_to_user(ubuf, s->buffer + start, cnt);
373 		return -EFAULT;
375 	return cnt - ret;
379  * seq_buf_hex_dump - print formatted hex dump into the sequence buffer
380  * @s: seq_buf descriptor
394  * 32 * 3 - maximum bytes per line, each printed into 2 chars + 1 for
396  * 2 - spaces separating hex dump and ASCII representation
397  * 32 - ASCII representation
398  * 1 - terminating '\0'
400  * Returns: zero on success, -1 on overflow.
402 int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str, int prefix_type,  argument
416 		remaining -= rowsize;
423 			ret = seq_buf_printf(s, "%s%p: %s\n",
427 			ret = seq_buf_printf(s, "%s%.8x: %s\n",
431 			ret = seq_buf_printf(s, "%s%s\n", prefix_str, linebuf);