OpenTTD Source: src/misc/getoptdata.cpp Source File

OpenTTD Source 14.0-RC3

getoptdata.cpp
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1 /*
2 * This file is part of OpenTTD.
3 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
4 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
5 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
6 */
7
10 #include "../stdafx.h"
11 #include "getoptdata.h"
12
13 #include "../safeguards.h"
14
22 int GetOptData::GetOpt()
23 {
24 const OptionData *odata;
25
26 char *s = this->cont;
27 if (s == nullptr) {
28 if (this->numleft == 0) return -1; // No arguments left -> finished.
29
30 s = this->argv[0];
31 if (*s != '-') return -1; // No leading '-' -> not an option -> finished.
32
33 this->argv++;
34 this->numleft--;
35
36 /* Is it a long option? */
37 for (odata = this->options; odata->flags != ODF_END; odata++) {
38 if (odata->longname != nullptr && !strcmp(odata->longname, s)) { // Long options always use the entire argument.
39 this->cont = nullptr;
40 goto set_optval;
41 }
42 }
43
44 s++; // Skip leading '-'.
45 }
46
47 /* Is it a short option? */
48 for (odata = this->options; odata->flags != ODF_END; odata++) {
49 if (odata->shortname != '\0' && *s == odata->shortname) {
50 this->cont = (s[1] != '\0') ? s + 1 : nullptr;
51
52 set_optval: // Handle option value of *odata .
53 this->opt = nullptr;
54 switch (odata->flags) {
55 case ODF_NO_VALUE:
56 return odata->id;
57
58 case ODF_HAS_VALUE:
59 case ODF_OPTIONAL_VALUE:
60 if (this->cont != nullptr) { // Remainder of the argument is the option value.
61 this->opt = this->cont;
62 this->cont = nullptr;
63 return odata->id;
64 }
65 /* No more arguments, either return an error or a value-less option. */
66 if (this->numleft == 0) return (odata->flags == ODF_HAS_VALUE) ? -2 : odata->id;
67
68 /* Next argument looks like another option, let's not return it as option value. */
69 if (odata->flags == ODF_OPTIONAL_VALUE && this->argv[0][0] == '-') return odata->id;
70
71 this->opt = this->argv[0]; // Next argument is the option value.
72 this->argv++;
73 this->numleft--;
74 return odata->id;
75
76 default: NOT_REACHED();
77 }
78 }
79 }
80
81 return -2; // No other ways to interpret the text -> error.
82 }
83
OptionData::flags
uint16_t flags
Option data flags.
Definition: getoptdata.h:25
ODF_END
@ ODF_END
Terminator (data is not parsed further).
Definition: getoptdata.h:18
ODF_OPTIONAL_VALUE
@ ODF_OPTIONAL_VALUE
An option with an optional value.
Definition: getoptdata.h:17
OptionData::longname
const char * longname
Long option name including '-'/'–' prefix, use nullptr if not available.
Definition: getoptdata.h:26
GetOptData::options
const OptionData * options
Command line option descriptions.
Definition: getoptdata.h:34
GetOptData::argv
char ** argv
Remaining command line arguments.
Definition: getoptdata.h:33
GetOptData::opt
char * opt
Option value, if available (else nullptr).
Definition: getoptdata.h:31
OptionData
Data of an option.
Definition: getoptdata.h:22
OptionData::id
byte id
Unique identification of this option data, often the same as shortname.
Definition: getoptdata.h:23
OptionData::shortname
char shortname
Short option letter if available, else use '\0'.
Definition: getoptdata.h:24
GetOptData::cont
char * cont
Next call to GetOpt should start here (in the middle of an argument).
Definition: getoptdata.h:35
GetOptData::GetOpt
int GetOpt()
Find the next option.
Definition: getoptdata.cpp:22
ODF_HAS_VALUE
@ ODF_HAS_VALUE
An option with a value.
Definition: getoptdata.h:16
getoptdata.h
ODF_NO_VALUE
@ ODF_NO_VALUE
A plain option (no value attached to it).
Definition: getoptdata.h:15
GetOptData::numleft
int numleft
Number of arguments left in argv.
Definition: getoptdata.h:32