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
|
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include "termio/termio.h"
#include <vector>
#include <string>
using namespace std;
#define PORT 1234
#define STR_(x) #x
#define STR(x) STR_(x)
__attribute__((noreturn))
static void die_perror(const char *msg) {
perror(msg);
exit(1);
}
static int create_server_socket(void) {
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) die_perror("socket");
int one = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
struct sockaddr_in name;
memset(&name, 0, sizeof name);
name.sin_family = AF_INET;
name.sin_addr.s_addr = htonl(INADDR_ANY);
name.sin_port = htons(PORT);
if (::bind(sock, (struct sockaddr*)&name, sizeof name) < 0) die_perror("bind");
if (listen(sock, 16) < 0) die_perror("listen");
return sock;
}
static void writeall(int sock, const char *data, size_t len) {
size_t cursor = 0;
while (cursor < len) {
ssize_t nw = write(sock, data + cursor, len - cursor);
if (nw <= 0) die_perror("write");
cursor += nw;
}
}
static void print_buffer(const char *buffer, size_t len) {
Size tsize = querytermsize();
if (len + 1 >= tsize.w) {
printf("\x1B[2K\x1B[G%s", buffer + len - tsize.w + 1);
} else {
printf("\x1B[2K\x1B[G%s", buffer);
}
fflush(stdout);
}
static void communicate(int sock) {
printf("Connected.\n");
string buffer;
string inbuffer;
initkeyboard(false);
atexit(endkeyboard);
while (true) {
Size tsize = querytermsize();
fd_set inset;
FD_ZERO(&inset);
FD_SET(0, &inset);
FD_SET(sock, &inset);
int ret = select(sock + 1, &inset, NULL, NULL, NULL);
if (ret < 0) {
if (errno == EINTR) continue;
die_perror("select");
}
if (FD_ISSET(0, &inset)) {
int key = tgetkey();
if (key == -1) { // EOF
return;
} else if (key == KEY_LF || key == KEY_CR) {
buffer.push_back('\n');
writeall(sock, buffer.data(), buffer.size());
buffer.pop_back();
printf("\x1B[2K\x1B[G%s\n", buffer.data());
fflush(stdout);
buffer.clear();
} else if (key == KEY_BACKSPACE) {
if (buffer.empty()) {
bel();
} else {
buffer.pop_back();
print_buffer(buffer.data(), buffer.size());
}
} else if (32 <= key) {
buffer.push_back(key);
print_buffer(buffer.data(), buffer.size());
} else {
bel();
}
}
if (FD_ISSET(sock, &inset)) {
size_t prevsize = inbuffer.size();
inbuffer.resize(prevsize + 1024);
ssize_t nr = read(sock, (void*)(inbuffer.data() + prevsize), 1024);
if (nr < 0) die_perror("read");
if (nr == 0) return; // eof
inbuffer.resize(prevsize + nr);
for (size_t idx; (idx = inbuffer.find('\n')) != string::npos; ) {
inbuffer[idx] = '\0';
printf("\x1B[2K\x1B[G%s\n", inbuffer.data());
inbuffer.erase(inbuffer.begin(), inbuffer.begin() + idx + 1);
}
print_buffer(buffer.data(), buffer.size());
}
}
}
int main(int argc, char **argv) {
if (argc == 2 && strcmp(argv[1], "-s") == 0) {
int lsock = create_server_socket();
printf("Listening on port %d\n", PORT);
int sock = accept(lsock, NULL, NULL);
if (sock == -1) die_perror("accept");
communicate(sock);
close(sock);
} else if (argc == 2) {
struct addrinfo *addrs;
struct addrinfo hints;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (getaddrinfo(argv[1], STR(PORT), &hints, &addrs) < 0) die_perror("getaddrinfo");
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) die_perror("socket");
bool success = false;
for (struct addrinfo *addr = addrs; addr; addr = addr->ai_next) {
if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) continue;
success = true;
break;
}
if (!success) {
perror("connect");
freeaddrinfo(addrs);
exit(1);
}
communicate(sock);
close(sock);
}
}
|
