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buffer_compat.h
Go to the documentation of this file.
1 /*
2 * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _EVENT2_BUFFER_COMPAT_H_
28 #define _EVENT2_BUFFER_COMPAT_H_
29
30 /** @file event2/buffer_compat.h
31
32 Obsolete and deprecated versions of the functions in buffer.h: provided
33 only for backward compatibility.
34 */
35
36
37 /**
38 Obsolete alias for evbuffer_readln(buffer, NULL, EOL_STYLE_ANY).
39
40 @deprecated This function is deprecated because its behavior is not correct
41 for almost any protocol, and also because it's wholly subsumed by
42 evbuffer_readln().
43
44 @param buffer the evbuffer to read from
45 @return pointer to a single line, or NULL if an error occurred
46
47 */
48 char *evbuffer_readline(struct evbuffer *buffer);
49
50 /** Type definition for a callback that is invoked whenever data is added or
51 removed from an evbuffer.
52
53 An evbuffer may have one or more callbacks set at a time. The order
54 in which they are executed is undefined.
55
56 A callback function may add more callbacks, or remove itself from the
57 list of callbacks, or add or remove data from the buffer. It may not
58 remove another callback from the list.
59
60 If a callback adds or removes data from the buffer or from another
61 buffer, this can cause a recursive invocation of your callback or
62 other callbacks. If you ask for an infinite loop, you might just get
63 one: watch out!
64
65 @param buffer the buffer whose size has changed
66 @param old_len the previous length of the buffer
67 @param new_len the current length of the buffer
68 @param arg a pointer to user data
69 */
70 typedef void (*evbuffer_cb)(struct evbuffer *buffer, size_t old_len, size_t new_len, void *arg);
71
72 /**
73 Replace all callbacks on an evbuffer with a single new callback, or
74 remove them.
75
76 Subsequent calls to evbuffer_setcb() replace callbacks set by previous
77 calls. Setting the callback to NULL removes any previously set callback.
78
79 @deprecated This function is deprecated because it clears all previous
80 callbacks set on the evbuffer, which can cause confusing behavior if
81 multiple parts of the code all want to add their own callbacks on a
82 buffer. Instead, use evbuffer_add(), evbuffer_del(), and
83 evbuffer_setflags() to manage your own evbuffer callbacks without
84 interfering with callbacks set by others.
85
86 @param buffer the evbuffer to be monitored
87 @param cb the callback function to invoke when the evbuffer is modified,
88 or NULL to remove all callbacks.
89 @param cbarg an argument to be provided to the callback function
90 */
91 void evbuffer_setcb(struct evbuffer *buffer, evbuffer_cb cb, void *cbarg);
92
93
94 /**
95 Find a string within an evbuffer.
96
97 @param buffer the evbuffer to be searched
98 @param what the string to be searched for
99 @param len the length of the search string
100 @return a pointer to the beginning of the search string, or NULL if the search failed.
101 */
102 unsigned char *evbuffer_find(struct evbuffer *buffer, const unsigned char *what, size_t len);
103
104 /** deprecated in favor of calling the functions directly */
105 #define EVBUFFER_LENGTH(x) evbuffer_get_length(x)
106 /** deprecated in favor of calling the functions directly */
107 #define EVBUFFER_DATA(x) evbuffer_pullup((x), -1)
108
109 #endif
110
evbuffer
Definition: evbuffer-internal.h:78
evbuffer_cb
void(* evbuffer_cb)(struct evbuffer *buffer, size_t old_len, size_t new_len, void *arg)
Type definition for a callback that is invoked whenever data is added or removed from an evbuffer...
Definition: buffer_compat.h:70
evbuffer_setcb
void evbuffer_setcb(struct evbuffer *buffer, evbuffer_cb cb, void *cbarg)
Replace all callbacks on an evbuffer with a single new callback, or remove them.
Definition: buffer.c:2811
evbuffer_readline
char * evbuffer_readline(struct evbuffer *buffer)
Obsolete alias for evbuffer_readln(buffer, NULL, EOL_STYLE_ANY).
Definition: buffer.c:1241
evbuffer_find
unsigned char * evbuffer_find(struct evbuffer *buffer, const unsigned char *what, size_t len)
Find a string within an evbuffer.
Definition: buffer.c:2333