aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/util/strbuf.h
blob: a3d121d6c83e1d64355ef0cc6bc4c8595110a9fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
#ifndef __PERF_STRBUF_H
#define __PERF_STRBUF_H

/*
 * Strbuf's can be use in many ways: as a byte array, or to store arbitrary
 * long, overflow safe strings.
 *
 * Strbufs has some invariants that are very important to keep in mind:
 *
 * 1. the ->buf member is always malloc-ed, hence strbuf's can be used to
 *    build complex strings/buffers whose final size isn't easily known.
 *
 *    It is NOT legal to copy the ->buf pointer away.
 *    `strbuf_detach' is the operation that detachs a buffer from its shell
 *    while keeping the shell valid wrt its invariants.
 *
 * 2. the ->buf member is a byte array that has at least ->len + 1 bytes
 *    allocated. The extra byte is used to store a '\0', allowing the ->buf
 *    member to be a valid C-string. Every strbuf function ensure this
 *    invariant is preserved.
 *
 *    Note that it is OK to "play" with the buffer directly if you work it
 *    that way:
 *
 *    strbuf_grow(sb, SOME_SIZE);
 *       ... Here, the memory array starting at sb->buf, and of length
 *       ... strbuf_avail(sb) is all yours, and you are sure that
 *       ... strbuf_avail(sb) is at least SOME_SIZE.
 *    strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE);
 *
 *    Of course, SOME_OTHER_SIZE must be smaller or equal to strbuf_avail(sb).
 *
 *    Doing so is safe, though if it has to be done in many places, adding the
 *    missing API to the strbuf module is the way to go.
 *
 *    XXX: do _not_ assume that the area that is yours is of size ->alloc - 1
 *         even if it's true in the current implementation. Alloc is somehow a
 *         "private" member that should not be messed with.
 */

#include <assert.h>

extern char strbuf_slopbuf[];
struct strbuf {
	size_t alloc;
	size_t len;
	char *buf;
};

#define STRBUF_INIT  { 0, 0, strbuf_slopbuf }

/*----- strbuf life cycle -----*/
extern void strbuf_init(struct strbuf *buf, ssize_t hint);
extern void strbuf_release(struct strbuf *);
extern char *strbuf_detach(struct strbuf *, size_t *);
extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) {
	struct strbuf tmp = *a;
	*a = *b;
	*b = tmp;
}

/*----- strbuf size related -----*/
static inline ssize_t strbuf_avail(const struct strbuf *sb) {
	return sb->alloc ? sb->alloc - sb->len - 1 : 0;
}

extern void strbuf_grow(struct strbuf *, size_t);

static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
	if (!sb->alloc)
		strbuf_grow(sb, 0);
	assert(len < sb->alloc);
	sb->len = len;
	sb->buf[len] = '\0';
}
#define strbuf_reset(sb)  strbuf_setlen(sb, 0)

/*----- content related -----*/
extern void strbuf_trim(struct strbuf *);
extern void strbuf_rtrim(struct strbuf *);
extern void strbuf_ltrim(struct strbuf *);
extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
extern void strbuf_tolower(struct strbuf *);

extern struct strbuf **strbuf_split(const struct strbuf *, int delim);
extern void strbuf_list_free(struct strbuf **);

/*----- add data in your buffer -----*/
static inline void strbuf_addch(struct strbuf *sb, int c) {
	strbuf_grow(sb, 1);
	sb->buf[sb->len++] = c;
	sb->buf[sb->len] = '\0';
}

extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
extern void strbuf_remove(struct strbuf *, size_t pos, size_t len);

/* splice pos..pos+len with given data */
extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
                          const void *, size_t);

extern void strbuf_add(struct strbuf *, const void *, size_t);
static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
	strbuf_add(sb, s, strlen(s));
}
static inline void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2) {
	strbuf_add(sb, sb2->buf, sb2->len);
}
extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len);

typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context);
extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context);
struct strbuf_expand_dict_entry {
	const char *placeholder;
	const char *value;
};
extern size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, void *context);

__attribute__((format(printf,2,3)))
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);

extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
/* XXX: if read fails, any partial read is undone */
extern ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);
extern int strbuf_read_file(struct strbuf *sb, const char *path, ssize_t hint);
extern int strbuf_readlink(struct strbuf *sb, const char *path, ssize_t hint);

extern int strbuf_getline(struct strbuf *, FILE *, int);

extern void stripspace(struct strbuf *buf, int skip_comments);
extern int launch_editor(const char *path, struct strbuf *buffer, const char *const *env);

extern int strbuf_branchname(struct strbuf *sb, const char *name);
extern int strbuf_check_branch_ref(struct strbuf *sb, const char *name);

#endif /* __PERF_STRBUF_H */