misc/libphysfs/lzma/CPP/Common/CommandLineParser.cpp
author nemo
Mon, 10 Apr 2017 12:06:43 -0400 (2017-04-10)
changeset 12218 bb5522e88ab2
permissions -rw-r--r--
bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
// CommandLineParser.cpp

#include "StdAfx.h"

#include "CommandLineParser.h"

namespace NCommandLineParser {

void SplitCommandLine(const UString &src, UString &dest1, UString &dest2)
{
  dest1.Empty();
  dest2.Empty();
  bool quoteMode = false;
  int i;
  for (i = 0; i < src.Length(); i++)
  {
    wchar_t c = src[i];
    if (c == L'\"')
      quoteMode = !quoteMode;
    else if (c == L' ' && !quoteMode)
    {
      i++;
      break;
    }
    else 
      dest1 += c;
  }
  dest2 = src.Mid(i);
}

void SplitCommandLine(const UString &s, UStringVector &parts)
{
  UString sTemp = s;
  sTemp.Trim();
  parts.Clear();
  for (;;)
  {
    UString s1, s2;
    SplitCommandLine(sTemp, s1, s2);
    // s1.Trim();
    // s2.Trim();
    if (!s1.IsEmpty())
      parts.Add(s1);
    if (s2.IsEmpty())
      break;
    sTemp = s2;
  }
}


static const wchar_t kSwitchID1 = '-';
// static const wchar_t kSwitchID2 = '/';

static const wchar_t kSwitchMinus = '-';
static const wchar_t *kStopSwitchParsing = L"--";

static bool IsItSwitchChar(wchar_t c)
{ 
  return (c == kSwitchID1 /*|| c == kSwitchID2 */); 
}

CParser::CParser(int numSwitches):
  _numSwitches(numSwitches)
{
  _switches = new CSwitchResult[_numSwitches];
}

CParser::~CParser()
{
  delete []_switches;
}

void CParser::ParseStrings(const CSwitchForm *switchForms, 
  const UStringVector &commandStrings)
{
  int numCommandStrings = commandStrings.Size();
  bool stopSwitch = false;
  for (int i = 0; i < numCommandStrings; i++)
  {
    const UString &s = commandStrings[i];
    if (stopSwitch)
      NonSwitchStrings.Add(s);
    else
      if (s == kStopSwitchParsing)
        stopSwitch = true;
      else
        if (!ParseString(s, switchForms))
          NonSwitchStrings.Add(s);
  }
}

// if string contains switch then function updates switch structures
// out: (string is a switch)
bool CParser::ParseString(const UString &s, const CSwitchForm *switchForms)
{
  int len = s.Length();
  if (len == 0) 
    return false;
  int pos = 0;
  if (!IsItSwitchChar(s[pos]))
    return false;
  while(pos < len)
  {
    if (IsItSwitchChar(s[pos]))
      pos++;
    const int kNoLen = -1;
    int matchedSwitchIndex = 0; // GCC Warning
    int maxLen = kNoLen;
    for(int switchIndex = 0; switchIndex < _numSwitches; switchIndex++)
    {
      int switchLen = MyStringLen(switchForms[switchIndex].IDString);
      if (switchLen <= maxLen || pos + switchLen > len) 
        continue;

      UString temp = s + pos;
      temp = temp.Left(switchLen);
      if(temp.CompareNoCase(switchForms[switchIndex].IDString) == 0)
      // if(_strnicmp(switchForms[switchIndex].IDString, LPCSTR(s) + pos, switchLen) == 0)
      {
        matchedSwitchIndex = switchIndex;
        maxLen = switchLen;
      }
    }
    if (maxLen == kNoLen)
      throw "maxLen == kNoLen";
    CSwitchResult &matchedSwitch = _switches[matchedSwitchIndex];
    const CSwitchForm &switchForm = switchForms[matchedSwitchIndex];
    if ((!switchForm.Multi) && matchedSwitch.ThereIs)
      throw "switch must be single";
    matchedSwitch.ThereIs = true;
    pos += maxLen;
    int tailSize = len - pos;
    NSwitchType::EEnum type = switchForm.Type;
    switch(type)
    {
      case NSwitchType::kPostMinus:
        {
          if (tailSize == 0)
            matchedSwitch.WithMinus = false;
          else
          {
            matchedSwitch.WithMinus = (s[pos] == kSwitchMinus);
            if (matchedSwitch.WithMinus)
              pos++;
          }
          break;
        }
      case NSwitchType::kPostChar:
        {
          if (tailSize < switchForm.MinLen)
            throw "switch is not full";
          UString set = switchForm.PostCharSet;
          const int kEmptyCharValue = -1;
          if (tailSize == 0)
            matchedSwitch.PostCharIndex = kEmptyCharValue;
          else
          {
            int index = set.Find(s[pos]);
            if (index < 0)
              matchedSwitch.PostCharIndex =  kEmptyCharValue;
            else
            {
              matchedSwitch.PostCharIndex = index;
              pos++;
            }
          }
          break;
        }
      case NSwitchType::kLimitedPostString: 
      case NSwitchType::kUnLimitedPostString: 
        {
          int minLen = switchForm.MinLen;
          if (tailSize < minLen)
            throw "switch is not full";
          if (type == NSwitchType::kUnLimitedPostString)
          {
            matchedSwitch.PostStrings.Add(s.Mid(pos));
            return true;
          }
          int maxLen = switchForm.MaxLen;
          UString stringSwitch = s.Mid(pos, minLen);
          pos += minLen;
          for(int i = minLen; i < maxLen && pos < len; i++, pos++)
          {
            wchar_t c = s[pos];
            if (IsItSwitchChar(c))
              break;
            stringSwitch += c;
          }
          matchedSwitch.PostStrings.Add(stringSwitch);
          break;
        }
      case NSwitchType::kSimple:
          break;
    }
  }
  return true;
}

const CSwitchResult& CParser::operator[](size_t index) const
{
  return _switches[index];
}

/////////////////////////////////
// Command parsing procedures

int ParseCommand(int numCommandForms, const CCommandForm *commandForms, 
    const UString &commandString, UString &postString)
{
  for(int i = 0; i < numCommandForms; i++)
  {
    const UString id = commandForms[i].IDString;
    if (commandForms[i].PostStringMode)
    {
      if(commandString.Find(id) == 0)
      {
        postString = commandString.Mid(id.Length());
        return i;
      }
    }
    else
      if (commandString == id)
      {
        postString.Empty();
        return i;
      }
  }
  return -1;
}
   
}