1 // SPDX-License-Identifier: GPL-2.0
26 #include <linux/string.h>
31  * seq_buf_can_fit - can the new data fit in the current buffer?
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
48  * Returns: zero on success, non-zero otherwise.
54 	return seq_write(m, s->buffer, len);  in seq_buf_print_seq()
58  * seq_buf_vprintf - sequence printing of information.
60  * @fmt: printf format string
65  * Returns: zero on success, -1 on overflow.
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()
81 	return -1;  in seq_buf_vprintf()
85  * seq_buf_printf - sequence printing of information
87  * @fmt: printf format string
91  * Returns: zero on success, -1 on overflow.
107  * seq_buf_do_printk - printk() seq_buf line by line
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
113  * as a string.
119 	if (s->size == 0 || s->len == 0)  in seq_buf_do_printk()
124 		int len = lf - start + 1;  in seq_buf_do_printk()
131 	if (start < s->buffer + s->len)  in seq_buf_do_printk()
138  * seq_buf_bprintf - Write the printf string from binary arguments
140  * @fmt: The format string for the @binary arguments
147  * word array that is defined by the format string constraints.
150  * the conversion into the ASCII string within the buffer.
152  * Returns: zero on success, -1 on overflow.
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()
169 	return -1;  in seq_buf_bprintf()
174  * seq_buf_puts - sequence printing of simple string
176  * @str: simple string to record
178  * Copy a simple string into the sequence buffer.
180  * Returns: zero on success, -1 on overflow.
186 	WARN_ON(s->size == 0);  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()
198 	return -1;  in seq_buf_puts()
203  * seq_buf_putc - sequence printing of simple character
209  * Returns: zero on success, -1 on overflow.
213 	WARN_ON(s->size == 0);  in seq_buf_putc()
216 		s->buffer[s->len++] = c;  in seq_buf_putc()
220 	return -1;  in seq_buf_putc()
225  * seq_buf_putmem - write raw data into the sequence buffer
234  * Returns: zero on success, -1 on overflow.
238 	WARN_ON(s->size == 0);  in seq_buf_putmem()
241 		memcpy(s->buffer + s->len, mem, len);  in seq_buf_putmem()
242 		s->len += len;  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
262  * Returns: zero on success, -1 on overflow.
272 	WARN_ON(s->size == 0);
281 		for (i = start_len-1, j = 0; i >= 0; i--) {
289 		/* j increments twice per loop */
294 			return -1;
296 		len -= start_len;
303  * seq_buf_path - copy a path into the sequence buffer
310  * Returns: the number of written bytes on success, -1 on overflow.
316 	int res = -1;
318 	WARN_ON(s->size == 0);
325 				res = end - buf;
334  * seq_buf_to_user - copy the sequence buffer to user space
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.
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
381  * @prefix_str: string to prefix each line with;
385  * @rowsize: number of bytes to print per line; must be 16 or 32
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.
416 		remaining -= rowsize;