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
|
/*
* Copyright (c) 2021, Thomas Voss <thomasvoss@live.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char** argv)
{
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
Vector<String> paths;
Core::ArgsParser args_parser;
args_parser.set_general_help("Concatente files to stdout with each line in reverse.");
args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
Vector<FILE*> streams;
auto num_paths = paths.size();
streams.ensure_capacity(num_paths ? num_paths : 1);
if (!paths.is_empty()) {
for (auto const& path : paths) {
FILE* stream = fopen(path.characters(), "r");
if (!stream) {
warnln("Failed to open {}: {}", path, strerror(errno));
continue;
}
streams.append(stream);
}
} else {
streams.append(stdin);
}
char* buffer = nullptr;
ScopeGuard guard = [&] {
free(buffer);
for (auto* stream : streams) {
if (fclose(stream))
perror("fclose");
}
};
if (pledge("stdio", nullptr) < 0) {
perror("pledge");
return 1;
}
for (auto* stream : streams) {
for (;;) {
size_t n = 0;
errno = 0;
ssize_t buflen = getline(&buffer, &n, stream);
if (buflen == -1) {
if (errno != 0) {
perror("getline");
return 1;
}
break;
}
outln("{}", String { buffer, Chomp }.reverse());
}
}
return 0;
}
|
