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Commit | Line | Data |
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d1df5743 JH |
1 | #ifndef STRBUF_H |
2 | #define STRBUF_H | |
b449f4cf PH |
3 | |
4 | /* | |
5 | * Strbuf's can be use in many ways: as a byte array, or to store arbitrary | |
6 | * long, overflow safe strings. | |
7 | * | |
8 | * Strbufs has some invariants that are very important to keep in mind: | |
9 | * | |
10 | * 1. the ->buf member is always malloc-ed, hence strbuf's can be used to | |
11 | * build complex strings/buffers whose final size isn't easily known. | |
12 | * | |
b315c5c0 | 13 | * It is NOT legal to copy the ->buf pointer away. |
b449f4cf PH |
14 | * `strbuf_detach' is the operation that detachs a buffer from its shell |
15 | * while keeping the shell valid wrt its invariants. | |
16 | * | |
17 | * 2. the ->buf member is a byte array that has at least ->len + 1 bytes | |
18 | * allocated. The extra byte is used to store a '\0', allowing the ->buf | |
19 | * member to be a valid C-string. Every strbuf function ensure this | |
20 | * invariant is preserved. | |
21 | * | |
22 | * Note that it is OK to "play" with the buffer directly if you work it | |
23 | * that way: | |
24 | * | |
25 | * strbuf_grow(sb, SOME_SIZE); | |
a1f611d5 SP |
26 | * ... Here, the memory array starting at sb->buf, and of length |
27 | * ... strbuf_avail(sb) is all yours, and you are sure that | |
28 | * ... strbuf_avail(sb) is at least SOME_SIZE. | |
b449f4cf PH |
29 | * strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE); |
30 | * | |
a1f611d5 | 31 | * Of course, SOME_OTHER_SIZE must be smaller or equal to strbuf_avail(sb). |
b449f4cf PH |
32 | * |
33 | * Doing so is safe, though if it has to be done in many places, adding the | |
34 | * missing API to the strbuf module is the way to go. | |
35 | * | |
36 | * XXX: do _not_ assume that the area that is yours is of size ->alloc - 1 | |
37 | * even if it's true in the current implementation. Alloc is somehow a | |
38 | * "private" member that should not be messed with. | |
39 | */ | |
40 | ||
41 | #include <assert.h> | |
42 | ||
b315c5c0 | 43 | extern char strbuf_slopbuf[]; |
d1df5743 | 44 | struct strbuf { |
b449f4cf PH |
45 | size_t alloc; |
46 | size_t len; | |
bf0f910d | 47 | char *buf; |
d1df5743 JH |
48 | }; |
49 | ||
b315c5c0 | 50 | #define STRBUF_INIT { 0, 0, strbuf_slopbuf } |
b449f4cf PH |
51 | |
52 | /*----- strbuf life cycle -----*/ | |
f1696ee3 | 53 | extern void strbuf_init(struct strbuf *, size_t); |
b449f4cf | 54 | extern void strbuf_release(struct strbuf *); |
b315c5c0 | 55 | extern char *strbuf_detach(struct strbuf *, size_t *); |
917c9a71 | 56 | extern void strbuf_attach(struct strbuf *, void *, size_t, size_t); |
c76689df PH |
57 | static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) { |
58 | struct strbuf tmp = *a; | |
59 | *a = *b; | |
60 | *b = tmp; | |
61 | } | |
b449f4cf PH |
62 | |
63 | /*----- strbuf size related -----*/ | |
64 | static inline size_t strbuf_avail(struct strbuf *sb) { | |
c76689df | 65 | return sb->alloc ? sb->alloc - sb->len - 1 : 0; |
b449f4cf | 66 | } |
a8f3e221 JH |
67 | |
68 | extern void strbuf_grow(struct strbuf *, size_t); | |
69 | ||
b449f4cf | 70 | static inline void strbuf_setlen(struct strbuf *sb, size_t len) { |
a8f3e221 JH |
71 | if (!sb->alloc) |
72 | strbuf_grow(sb, 0); | |
73 | assert(len < sb->alloc); | |
c76689df PH |
74 | sb->len = len; |
75 | sb->buf[len] = '\0'; | |
b449f4cf | 76 | } |
b315c5c0 | 77 | #define strbuf_reset(sb) strbuf_setlen(sb, 0) |
b449f4cf | 78 | |
f1696ee3 PH |
79 | /*----- content related -----*/ |
80 | extern void strbuf_rtrim(struct strbuf *); | |
45f66f64 | 81 | extern int strbuf_cmp(struct strbuf *, struct strbuf *); |
f1696ee3 | 82 | |
b449f4cf PH |
83 | /*----- add data in your buffer -----*/ |
84 | static inline void strbuf_addch(struct strbuf *sb, int c) { | |
85 | strbuf_grow(sb, 1); | |
86 | sb->buf[sb->len++] = c; | |
87 | sb->buf[sb->len] = '\0'; | |
88 | } | |
89 | ||
f1696ee3 | 90 | extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t); |
c76689df | 91 | extern void strbuf_remove(struct strbuf *, size_t pos, size_t len); |
f1696ee3 | 92 | |
917c9a71 PH |
93 | /* splice pos..pos+len with given data */ |
94 | extern void strbuf_splice(struct strbuf *, size_t pos, size_t len, | |
c76689df | 95 | const void *, size_t); |
917c9a71 | 96 | |
b449f4cf PH |
97 | extern void strbuf_add(struct strbuf *, const void *, size_t); |
98 | static inline void strbuf_addstr(struct strbuf *sb, const char *s) { | |
99 | strbuf_add(sb, s, strlen(s)); | |
100 | } | |
101 | static inline void strbuf_addbuf(struct strbuf *sb, struct strbuf *sb2) { | |
102 | strbuf_add(sb, sb2->buf, sb2->len); | |
103 | } | |
91db267e | 104 | extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len); |
b449f4cf | 105 | |
c3a670de MC |
106 | typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context); |
107 | extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context); | |
cde75e59 | 108 | |
b449f4cf PH |
109 | __attribute__((format(printf,2,3))) |
110 | extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...); | |
111 | ||
112 | extern size_t strbuf_fread(struct strbuf *, size_t, FILE *); | |
113 | /* XXX: if read fails, any partial read is undone */ | |
f1696ee3 | 114 | extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint); |
387e7e19 | 115 | extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint); |
b449f4cf | 116 | |
e6c019d0 | 117 | extern int strbuf_getline(struct strbuf *, FILE *, int); |
d1df5743 | 118 | |
6d69b6f6 | 119 | extern void stripspace(struct strbuf *buf, int skip_comments); |
8babab95 | 120 | extern void launch_editor(const char *path, struct strbuf *buffer, const char *const *env); |
6d69b6f6 | 121 | |
d1df5743 | 122 | #endif /* STRBUF_H */ |