1
2#ifndef _LINUX_SEQ_BUF_H
3#define _LINUX_SEQ_BUF_H
4
5#include <linux/fs.h>
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18
19struct seq_buf {
20 char *buffer;
21 size_t size;
22 size_t len;
23 loff_t readpos;
24};
25
26static inline void seq_buf_clear(struct seq_buf *s)
27{
28 s->len = 0;
29 s->readpos = 0;
30}
31
32static inline void
33seq_buf_init(struct seq_buf *s, char *buf, unsigned int size)
34{
35 s->buffer = buf;
36 s->size = size;
37 seq_buf_clear(s);
38}
39
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41
42
43
44static inline bool
45seq_buf_has_overflowed(struct seq_buf *s)
46{
47 return s->len > s->size;
48}
49
50static inline void
51seq_buf_set_overflow(struct seq_buf *s)
52{
53 s->len = s->size + 1;
54}
55
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58
59static inline unsigned int
60seq_buf_buffer_left(struct seq_buf *s)
61{
62 if (seq_buf_has_overflowed(s))
63 return 0;
64
65 return s->size - s->len;
66}
67
68
69static inline unsigned int seq_buf_used(struct seq_buf *s)
70{
71 return min(s->len, s->size);
72}
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87
88static inline void seq_buf_terminate(struct seq_buf *s)
89{
90 if (WARN_ON(s->size == 0))
91 return;
92
93 if (seq_buf_buffer_left(s))
94 s->buffer[s->len] = 0;
95 else
96 s->buffer[s->size - 1] = 0;
97}
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106
107static inline size_t seq_buf_get_buf(struct seq_buf *s, char **bufp)
108{
109 WARN_ON(s->len > s->size + 1);
110
111 if (s->len < s->size) {
112 *bufp = s->buffer + s->len;
113 return s->size - s->len;
114 }
115
116 *bufp = NULL;
117 return 0;
118}
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128
129static inline void seq_buf_commit(struct seq_buf *s, int num)
130{
131 if (num < 0) {
132 seq_buf_set_overflow(s);
133 } else {
134
135 BUG_ON(s->len + num > s->size);
136 s->len += num;
137 }
138}
139
140extern __printf(2, 3)
141int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
142extern __printf(2, 0)
143int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
144extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s);
145extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf,
146 int cnt);
147extern int seq_buf_puts(struct seq_buf *s, const char *str);
148extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
149extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
150extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
151 unsigned int len);
152extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc);
153extern int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str,
154 int prefix_type, int rowsize, int groupsize,
155 const void *buf, size_t len, bool ascii);
156
157#ifdef CONFIG_BINARY_PRINTF
158extern int
159seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
160#endif
161
162#endif
163