From 900c88fe976fe62e103bb78ca720cec818ee98fb Mon Sep 17 00:00:00 2001
From: Don Gagne <don@thegagnes.com>
Date: Sat, 24 May 2014 16:14:23 -0700
Subject: [PATCH] Simple command line option parser

---
 src/CmdLineOptParser.cc | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/CmdLineOptParser.h  | 46 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 src/CmdLineOptParser.cc
 create mode 100644 src/CmdLineOptParser.h

diff --git a/src/CmdLineOptParser.cc b/src/CmdLineOptParser.cc
new file mode 100644
index 0000000..5e237a7
--- /dev/null
+++ b/src/CmdLineOptParser.cc
@@ -0,0 +1,59 @@
+/*=====================================================================
+ 
+ QGroundControl Open Source Ground Control Station
+ 
+ (c) 2009 - 2014 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ 
+ This file is part of the QGROUNDCONTROL project
+ 
+ QGROUNDCONTROL 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, either version 3 of the License, or
+ (at your option) any later version.
+ 
+ QGROUNDCONTROL 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.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+ 
+ ======================================================================*/
+
+/// @file
+///     @brief Command line option parser
+///
+///     @author Don Gagne <don@thegagnes.com>
+
+#include "CmdLineOptParser.h"
+
+#include <QString>
+
+/// @brief Implements a simple command line parser which sets booleans to true if the option is found.
+void ParseCmdLineOptions(int&           argc,                   ///< count of arguments in argv
+                         char*          argv[],                 ///< command line arguments
+                         CmdLineOpt_t*  prgOpts,                ///< command line options
+                         size_t         cOpts,                  ///< count of command line options
+                         bool           removeParsedOptions)    ///< true: remove parsed option from argc/argv
+{
+    // Start with all options off
+    for (size_t iOption=0; iOption<cOpts; iOption++) {
+        *prgOpts[iOption].flag = false;
+    }
+    
+    for (int iArg=1; iArg<argc; iArg++) {
+        for (size_t iOption=0; iOption<cOpts; iOption++) {
+            if (QString(argv[iArg]).compare(prgOpts[iOption].optionStr, Qt::CaseInsensitive) == 0) {
+                *prgOpts[iOption].flag = true;
+                if (removeParsedOptions) {
+                    for (int iShift=iArg; iShift<argc-1; iShift++) {
+                        argv[iShift] = argv[iShift+1];
+                    }
+                    argc--;
+                    iArg--;
+                }
+            }
+        }
+    }
+}
diff --git a/src/CmdLineOptParser.h b/src/CmdLineOptParser.h
new file mode 100644
index 0000000..95217f7
--- /dev/null
+++ b/src/CmdLineOptParser.h
@@ -0,0 +1,46 @@
+/*=====================================================================
+ 
+ QGroundControl Open Source Ground Control Station
+ 
+ (c) 2009 - 2014 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ 
+ This file is part of the QGROUNDCONTROL project
+ 
+ QGROUNDCONTROL 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, either version 3 of the License, or
+ (at your option) any later version.
+ 
+ QGROUNDCONTROL 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.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+ 
+ ======================================================================*/
+
+/// @file
+///     @brief Command line option parser
+///
+///     @author Don Gagne <don@thegagnes.com>
+
+#ifndef CMDLINEOPTPARSER_H
+#define CMDLINEOPTPARSER_H
+
+#include <cstring>
+
+/// @brief Structure used to pass command line options to the ParseCmdLineOptions function.
+typedef struct {
+    const char* optionStr;  ///< command line option, for example "--foo"
+    bool*       flag;       ///< if option is found this variable will be set to true
+} CmdLineOpt_t;
+
+void ParseCmdLineOptions(int&           argc,
+                         char*          argv[],
+                         CmdLineOpt_t*  prgOpts,
+                         size_t         cOpts,
+                         bool           removeParsedOptions);
+
+#endif