-
Notifications
You must be signed in to change notification settings - Fork 0
/
cmdline.C
93 lines (82 loc) · 2.49 KB
/
cmdline.C
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
#include "cmdline.H"
#include <string.h>
#include <stdio.h>
CmdLine::CmdLine(CmdLineOption const * opts)
: _idx(0)
, _opts(opts)
{}
CmdLineArg const CmdLine::next(int argc, char * argv[])
{
++_idx;
if (_idx >= argc) {
return CmdLineArg();
}
char const * arg = argv[_idx];
// Is it a command line argument?
if (*arg != '-') {
return CmdLineArg(CmdLineArg::NO_OPTION, argv[_idx]);
}
// Otherwise it is a short or long command line option
bool longOpt = false;
if (*arg == '-') {
++arg;
if (*arg == '\0') {
return CmdLineArg(CmdLineArg::INVALID_OPTION, argv[_idx]);
}
}
if (*arg == '-') {
++arg;
if (*arg == '\0') {
return CmdLineArg(CmdLineArg::INVALID_OPTION, argv[_idx]);
}
longOpt = true;
}
// The rest shall be the command line option
CmdLineOption const * opt = _opts;
char const * end = nullptr;
for (; opt->shortName != '\0'; ++opt) {
if (longOpt) {
if (opt->longName != nullptr && strncmp(arg, opt->longName, strlen(opt->longName)) == 0) {
end = arg + strlen(opt->longName);
// Shall end with '\0' or '='
if (*end == '\0' || *end == '=') {
break;
}
// Otherwise keep looking for matches
end = nullptr;
}
}
else {
if (*arg == opt->shortName) {
end = arg + 1;
break;
}
}
}
// Is it an invalid option
if (opt->shortName == '\0' || end == nullptr) {
return CmdLineArg(CmdLineArg::INVALID_OPTION, argv[_idx]);
}
// Does it require arguments?
if (opt->flag == CmdLineOption::RequiredArgument) {
// Shall end with '=' or '\0'
if (*end == '=') {
++end;
return CmdLineArg(opt->shortName, opt->longName, end);
}
else if (*end == '\0') {
// Argument is next
++_idx;
if (_idx >= argc) {
return CmdLineArg(CmdLineArg::REQUIRES_ARGUMENT, argv[_idx - 1]);
}
return CmdLineArg(opt->shortName, opt->longName, argv[_idx]);
}
}
// Does not require arguments; end shall be '\0'
if (*end == '\0') {
return CmdLineArg(opt->shortName, opt->longName);
}
// Otherwise this is an invalid option
return CmdLineArg(CmdLineArg::INVALID_OPTION, argv[_idx]);
}