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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*++
/* NAME
/* memcache_proto 3
/* SUMMARY
/* memcache low-level protocol
/* SYNOPSIS
/* #include <memcache_proto.h>
/*
/* int memcache_get(fp, buf, len)
/* VSTREAM *fp;
/* VSTRING *buf;
/* ssize_t len;
/*
/* int memcache_printf(fp, format, ...)
/* VSTREAM *fp;
/* const char *format;
/*
/* int memcache_vprintf(fp, format, ap)
/* VSTREAM *fp;
/* const char *format;
/* va_list ap;
/*
/* int memcache_fread(fp, buf, len)
/* VSTREAM *fp;
/* VSTRING *buf;
/* ssize_t len;
/*
/* int memcache_fwrite(fp, buf, len)
/* VSTREAM *fp;
/* const char *buf;
/* ssize_t len;
/* DESCRIPTION
/* This module implements the low-level memcache protocol.
/* All functions return -1 on error and 0 on success.
/* SEE ALSO
/* smtp_proto(3) SMTP low-level protocol.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
#include <sys_defs.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
#include <vstring.h>
#include <vstring_vstream.h>
#include <compat_va_copy.h>
/* Application-specific. */
#include <memcache_proto.h>
#define STR(x) vstring_str(x)
#define LEN(x) VSTRING_LEN(x)
/* memcache_get - read one line from peer */
int memcache_get(VSTREAM *stream, VSTRING *vp, ssize_t bound)
{
int last_char;
int next_char;
last_char = (bound == 0 ? vstring_get(vp, stream) :
vstring_get_bound(vp, stream, bound));
switch (last_char) {
/*
* Do some repair in the rare case that we stopped reading in the
* middle of the CRLF record terminator.
*/
case '\r':
if ((next_char = VSTREAM_GETC(stream)) == '\n') {
VSTRING_ADDCH(vp, '\n');
/* FALLTRHOUGH */
} else {
if (next_char != VSTREAM_EOF)
vstream_ungetc(stream, next_char);
/*
* Input too long, or EOF
*/
default:
if (msg_verbose)
msg_info("%s got %s", VSTREAM_PATH(stream),
LEN(vp) < bound ? "EOF" : "input too long");
return (-1);
}
/*
* Strip off the record terminator: either CRLF or just bare LF.
*/
case '\n':
vstring_truncate(vp, VSTRING_LEN(vp) - 1);
if (VSTRING_LEN(vp) > 0 && vstring_end(vp)[-1] == '\r')
vstring_truncate(vp, VSTRING_LEN(vp) - 1);
VSTRING_TERMINATE(vp);
if (msg_verbose)
msg_info("%s got: %s", VSTREAM_PATH(stream), STR(vp));
return (0);
}
}
/* memcache_fwrite - write one blob to peer */
int memcache_fwrite(VSTREAM *stream, const char *cp, ssize_t todo)
{
/*
* Sanity check.
*/
if (todo < 0)
msg_panic("memcache_fwrite: negative todo %ld", (long) todo);
/*
* Do the I/O.
*/
if (msg_verbose)
msg_info("%s write: %.*s", VSTREAM_PATH(stream), (int) todo, cp);
if (vstream_fwrite(stream, cp, todo) != todo
|| vstream_fputs("\r\n", stream) == VSTREAM_EOF)
return (-1);
else
return (0);
}
/* memcache_fread - read one blob from peer */
int memcache_fread(VSTREAM *stream, VSTRING *buf, ssize_t todo)
{
/*
* Sanity check.
*/
if (todo < 0)
msg_panic("memcache_fread: negative todo %ld", (long) todo);
/*
* Do the I/O.
*/
if (vstream_fread_buf(stream, buf, todo) != todo
|| VSTREAM_GETC(stream) != '\r'
|| VSTREAM_GETC(stream) != '\n') {
if (msg_verbose)
msg_info("%s read: error", VSTREAM_PATH(stream));
return (-1);
} else {
VSTRING_TERMINATE(buf);
if (msg_verbose)
msg_info("%s read: %s", VSTREAM_PATH(stream), STR(buf));
return (0);
}
}
/* memcache_vprintf - write one line to peer */
int memcache_vprintf(VSTREAM *stream, const char *fmt, va_list ap)
{
/*
* Do the I/O.
*/
vstream_vfprintf(stream, fmt, ap);
vstream_fputs("\r\n", stream);
if (vstream_ferror(stream))
return (-1);
else
return (0);
}
/* memcache_printf - write one line to peer */
int memcache_printf(VSTREAM *stream, const char *fmt,...)
{
va_list ap;
int ret;
va_start(ap, fmt);
if (msg_verbose) {
VSTRING *buf = vstring_alloc(100);
va_list ap2;
VA_COPY(ap2, ap);
vstring_vsprintf(buf, fmt, ap2);
va_end(ap2);
msg_info("%s write: %s", VSTREAM_PATH(stream), STR(buf));
vstring_free(buf);
}
/*
* Do the I/O.
*/
ret = memcache_vprintf(stream, fmt, ap);
va_end(ap);
return (ret);
}
|
