Commit | Line | Data |
---|---|---|
07800601 | 1 | #include "cache.h" |
e7f01d1e | 2 | #include <linux/kernel.h> |
07800601 IM |
3 | |
4 | int prefixcmp(const char *str, const char *prefix) | |
5 | { | |
6 | for (; ; str++, prefix++) | |
7 | if (!*prefix) | |
8 | return 0; | |
9 | else if (*str != *prefix) | |
10 | return (unsigned char)*prefix - (unsigned char)*str; | |
11 | } | |
12 | ||
13 | /* | |
14 | * Used as the default ->buf value, so that people can always assume | |
15 | * buf is non NULL and ->buf is NUL terminated even for a freshly | |
16 | * initialized strbuf. | |
17 | */ | |
18 | char strbuf_slopbuf[1]; | |
19 | ||
f37a291c | 20 | void strbuf_init(struct strbuf *sb, ssize_t hint) |
07800601 IM |
21 | { |
22 | sb->alloc = sb->len = 0; | |
23 | sb->buf = strbuf_slopbuf; | |
24 | if (hint) | |
25 | strbuf_grow(sb, hint); | |
26 | } | |
27 | ||
28 | void strbuf_release(struct strbuf *sb) | |
29 | { | |
30 | if (sb->alloc) { | |
74cf249d | 31 | zfree(&sb->buf); |
07800601 IM |
32 | strbuf_init(sb, 0); |
33 | } | |
34 | } | |
35 | ||
36 | char *strbuf_detach(struct strbuf *sb, size_t *sz) | |
37 | { | |
38 | char *res = sb->alloc ? sb->buf : NULL; | |
39 | if (sz) | |
40 | *sz = sb->len; | |
41 | strbuf_init(sb, 0); | |
42 | return res; | |
43 | } | |
44 | ||
07800601 IM |
45 | void strbuf_grow(struct strbuf *sb, size_t extra) |
46 | { | |
47 | if (sb->len + extra + 1 <= sb->len) | |
48 | die("you want to use way too much memory"); | |
49 | if (!sb->alloc) | |
50 | sb->buf = NULL; | |
51 | ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc); | |
52 | } | |
53 | ||
07800601 IM |
54 | void strbuf_add(struct strbuf *sb, const void *data, size_t len) |
55 | { | |
56 | strbuf_grow(sb, len); | |
57 | memcpy(sb->buf + sb->len, data, len); | |
58 | strbuf_setlen(sb, sb->len + len); | |
59 | } | |
60 | ||
c7118369 | 61 | void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap) |
07800601 IM |
62 | { |
63 | int len; | |
c7118369 | 64 | va_list ap_saved; |
07800601 IM |
65 | |
66 | if (!strbuf_avail(sb)) | |
67 | strbuf_grow(sb, 64); | |
c7118369 NK |
68 | |
69 | va_copy(ap_saved, ap); | |
f787d951 | 70 | len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap); |
07800601 | 71 | if (len < 0) |
f787d951 | 72 | die("your vsnprintf is broken"); |
07800601 IM |
73 | if (len > strbuf_avail(sb)) { |
74 | strbuf_grow(sb, len); | |
c7118369 NK |
75 | len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved); |
76 | va_end(ap_saved); | |
07800601 | 77 | if (len > strbuf_avail(sb)) { |
f787d951 | 78 | die("this should not happen, your vsnprintf is broken"); |
07800601 IM |
79 | } |
80 | } | |
81 | strbuf_setlen(sb, sb->len + len); | |
82 | } | |
83 | ||
c7118369 NK |
84 | void strbuf_addf(struct strbuf *sb, const char *fmt, ...) |
85 | { | |
86 | va_list ap; | |
87 | ||
88 | va_start(ap, fmt); | |
89 | strbuf_addv(sb, fmt, ap); | |
90 | va_end(ap); | |
91 | } | |
92 | ||
f37a291c | 93 | ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint) |
07800601 IM |
94 | { |
95 | size_t oldlen = sb->len; | |
96 | size_t oldalloc = sb->alloc; | |
97 | ||
98 | strbuf_grow(sb, hint ? hint : 8192); | |
99 | for (;;) { | |
100 | ssize_t cnt; | |
101 | ||
102 | cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1); | |
103 | if (cnt < 0) { | |
104 | if (oldalloc == 0) | |
105 | strbuf_release(sb); | |
106 | else | |
107 | strbuf_setlen(sb, oldlen); | |
108 | return -1; | |
109 | } | |
110 | if (!cnt) | |
111 | break; | |
112 | sb->len += cnt; | |
113 | strbuf_grow(sb, 8192); | |
114 | } | |
115 | ||
116 | sb->buf[sb->len] = '\0'; | |
117 | return sb->len - oldlen; | |
118 | } |