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
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Test the erl_print_term() function.
* Author: Bjorn Gustavsson
*/
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef __WIN32__
#include <unistd.h>
#endif
#include "erl_interface.h"
#ifndef __WIN32__
#define _O_BINARY 0
#define _setmode(fd, mode)
#endif
#define HEADER_SIZE 2
static int readn(int, unsigned char*, int);
/*
* This program doesn't use the runner, because it needs a packet
* on input, but the result will be as a stream of bytes (since
* erl_print_term() prints directly on a file).
*
* Input is a package of with a packet header size of two bytes.
*
* +------------------------------------------------------------+
* | length | Encoded term... |
* | (2 bytes) | (as given by "length") |
* +------------------------------------------------------------+
*
* <------------------- length --------------------->
*
* This program decodes the encoded terms and passes it to
* erl_print_term(). Then this program prints
*
* CR <result> LF
*
* and waits for a new package. <result> is the return value from
* erl_print_term(), formatted as an ASCII string.
*/
#ifdef VXWORKS
int print_term()
#else
int main()
#endif
{
_setmode(0, _O_BINARY);
_setmode(1, _O_BINARY);
erl_init(NULL, 0);
for (;;) {
char buf[4*1024];
ETERM* term;
char* message;
int n;
if (readn(0, buf, 2) <= 0) {
/* fprintf(stderr, "error reading message header\n"); */
/* actually this is where we leave the infinite loop */
exit(1);
}
n = buf[0] * 256 + buf[1];
if (readn(0, buf, n) < 0) {
fprintf(stderr, "error reading message contents\n");
exit(1);
}
term = erl_decode(buf);
if (term == NULL) {
fprintf(stderr, "erl_decode() failed\n");
exit(1);
}
n = erl_print_term(stdout, term);
erl_free_compound(term);
fprintf(stdout,"\r%d\n", n);
fflush(stdout);
}
}
/*
* Reads len number of bytes.
*/
static int
readn(fd, buf, len)
int fd; /* File descriptor to read from. */
unsigned char *buf; /* Store in this buffer. */
int len; /* Number of bytes to read. */
{
int n; /* Byte count in last read call. */
int sofar = 0; /* Bytes read so far. */
do {
if ((n = read(fd, buf+sofar, len-sofar)) <= 0)
/* error or EOF in read */
return(n);
sofar += n;
} while (sofar < len);
return sofar;
}
|
