]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - tools/perf/util/strbuf.c
2 #include <linux/kernel.h>
4 int prefixcmp(const char *str
, const char *prefix
)
6 for (; ; str
++, prefix
++)
9 else if (*str
!= *prefix
)
10 return (unsigned char)*prefix
- (unsigned char)*str
;
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
18 char strbuf_slopbuf
[1];
20 void strbuf_init(struct strbuf
*sb
, ssize_t hint
)
22 sb
->alloc
= sb
->len
= 0;
23 sb
->buf
= strbuf_slopbuf
;
25 strbuf_grow(sb
, hint
);
28 void strbuf_release(struct strbuf
*sb
)
36 char *strbuf_detach(struct strbuf
*sb
, size_t *sz
)
38 char *res
= sb
->alloc
? sb
->buf
: NULL
;
45 void strbuf_grow(struct strbuf
*sb
, size_t extra
)
47 if (sb
->len
+ extra
+ 1 <= sb
->len
)
48 die("you want to use way too much memory");
51 ALLOC_GROW(sb
->buf
, sb
->len
+ extra
+ 1, sb
->alloc
);
54 static void strbuf_splice(struct strbuf
*sb
, size_t pos
, size_t len
,
55 const void *data
, size_t dlen
)
58 die("you want to use way too much memory");
60 die("`pos' is too far after the end of the buffer");
61 if (pos
+ len
> sb
->len
)
62 die("`pos + len' is too far after the end of the buffer");
65 strbuf_grow(sb
, dlen
- len
);
66 memmove(sb
->buf
+ pos
+ dlen
,
69 memcpy(sb
->buf
+ pos
, data
, dlen
);
70 strbuf_setlen(sb
, sb
->len
+ dlen
- len
);
73 void strbuf_remove(struct strbuf
*sb
, size_t pos
, size_t len
)
75 strbuf_splice(sb
, pos
, len
, NULL
, 0);
78 void strbuf_add(struct strbuf
*sb
, const void *data
, size_t len
)
81 memcpy(sb
->buf
+ sb
->len
, data
, len
);
82 strbuf_setlen(sb
, sb
->len
+ len
);
85 void strbuf_addf(struct strbuf
*sb
, const char *fmt
, ...)
90 if (!strbuf_avail(sb
))
93 len
= vsnprintf(sb
->buf
+ sb
->len
, sb
->alloc
- sb
->len
, fmt
, ap
);
96 die("your vsnprintf is broken");
97 if (len
> strbuf_avail(sb
)) {
100 len
= vsnprintf(sb
->buf
+ sb
->len
, sb
->alloc
- sb
->len
, fmt
, ap
);
102 if (len
> strbuf_avail(sb
)) {
103 die("this should not happen, your vsnprintf is broken");
106 strbuf_setlen(sb
, sb
->len
+ len
);
109 ssize_t
strbuf_read(struct strbuf
*sb
, int fd
, ssize_t hint
)
111 size_t oldlen
= sb
->len
;
112 size_t oldalloc
= sb
->alloc
;
114 strbuf_grow(sb
, hint
? hint
: 8192);
118 cnt
= read(fd
, sb
->buf
+ sb
->len
, sb
->alloc
- sb
->len
- 1);
123 strbuf_setlen(sb
, oldlen
);
129 strbuf_grow(sb
, 8192);
132 sb
->buf
[sb
->len
] = '\0';
133 return sb
->len
- oldlen
;