StringBuffer.cpp

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* Copyright (C) 2006, Novell, Inc. All rights reserved.
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#include "blocxx/BLOCXX_config.h"
#include "blocxx/StringBuffer.hpp"
#include "blocxx/Char16.hpp"

#include <cstring>
#include <cstdio>
#include <cctype>
#if defined(BLOCXX_HAVE_ISTREAM) && defined(BLOCXX_HAVE_OSTREAM)
#include <istream>
#include <ostream>
#else
#include <iostream>
#endif
#include <algorithm> // for std::swap
#include <cfloat> // for DBL_MANT_DIG

namespace BLOCXX_NAMESPACE
{

#if defined(BLOCXX_AIX)
const size_t StringBuffer::BLOCXX_DEFAULT_ALLOCATION_UNIT = 128;
#endif // BLOCXX_AIX

StringBuffer::StringBuffer(size_t allocSize) :
   m_len(0),
   m_allocated(allocSize > 0 ? allocSize : BLOCXX_DEFAULT_ALLOCATION_UNIT),
   m_bfr(new char[m_allocated])
{
   m_bfr[0] = 0;
}
StringBuffer::StringBuffer(const char* arg) :
   m_len(strlen(arg)),
   m_allocated(m_len + BLOCXX_DEFAULT_ALLOCATION_UNIT),
   m_bfr(new char[m_allocated])
{
   ::strcpy(m_bfr, arg);
}
StringBuffer::StringBuffer(const String& arg) :
   m_len(arg.length()),
   m_allocated(m_len + BLOCXX_DEFAULT_ALLOCATION_UNIT),
   m_bfr(new char[m_allocated])
{
   ::strcpy(m_bfr, arg.c_str());
}
StringBuffer::StringBuffer(const StringBuffer& arg) :
   m_len(arg.m_len), m_allocated(arg.m_allocated),
   m_bfr(new char[arg.m_allocated])
{
   ::memmove(m_bfr, arg.m_bfr, arg.m_len + 1);
}
StringBuffer&
StringBuffer::operator= (const String& arg)
{
   StringBuffer(arg).swap(*this);
   return *this;
}
StringBuffer&
StringBuffer::operator= (const char* str)
{
   StringBuffer(str).swap(*this);
   return *this;
}
StringBuffer&
StringBuffer::operator =(const StringBuffer& arg)
{
   StringBuffer(arg).swap(*this);
   return *this;
}
void
StringBuffer::swap(StringBuffer& x)
{
   std::swap(m_len, x.m_len);
   std::swap(m_allocated, x.m_allocated);
   std::swap(m_bfr, x.m_bfr);
}
void
StringBuffer::reset()
{
   m_len = 0;
   m_bfr[0] = '\0';
}

void
StringBuffer::truncate(size_t index)
{
   if (index < m_len)
   {
      m_bfr[index] = '\0';
      m_len = index;
   }
}

char
StringBuffer::operator[] (size_t ndx) const
{
   return (ndx > m_len) ? 0 : m_bfr[ndx];
}
// This operator must write "TRUE"/"FALSE" to StringBuffer
StringBuffer&
StringBuffer::operator += (Bool v)
{
   return append(v.toString());
}
#if defined(BLOCXX_WIN32)
#define snprintf _snprintf // stupid windoze...
#endif

StringBuffer&
StringBuffer::operator += (UInt8 v)
{
   char bfr[6];
   ::snprintf(bfr, sizeof(bfr), "%u", UInt32(v));
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (Int8 v)
{
   char bfr[6];
   ::snprintf(bfr, sizeof(bfr), "%d", Int32(v));
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (UInt16 v)
{
   char bfr[16];
   ::snprintf(bfr, sizeof(bfr), "%u", UInt32(v));
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (Int16 v)
{
   char bfr[16];
   ::snprintf(bfr, sizeof(bfr), "%d", Int32(v));
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (UInt32 v)
{
   char bfr[16];
   ::snprintf(bfr, sizeof(bfr), "%u", v);
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (Int32 v)
{
   char bfr[16];
   ::snprintf(bfr, sizeof(bfr), "%d", v);
   return append(bfr);
}
#if defined(BLOCXX_INT32_IS_INT) && defined(BLOCXX_INT64_IS_LONG_LONG)

StringBuffer&
StringBuffer::operator += (unsigned long v)
{
   char bfr[28];
   ::snprintf(bfr, sizeof(bfr), "%lu", v);
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (long v)
{
   char bfr[28];
   ::snprintf(bfr, sizeof(bfr), "%ld", v);
   return append(bfr);
}
#endif

StringBuffer&
StringBuffer::operator += (UInt64 v)
{
   char bfr[28];
#if BLOCXX_SIZEOF_LONG_INT == 8
   ::snprintf(bfr, sizeof(bfr), "%lu", v);
#else
   ::snprintf(bfr, sizeof(bfr), "%llu", v);
#endif
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (Int64 v)
{
   char bfr[28];
#if BLOCXX_SIZEOF_LONG_INT == 8
   ::snprintf(bfr, sizeof(bfr), "%ld", v);
#else
   ::snprintf(bfr, sizeof(bfr), "%lld", v);
#endif
   return append(bfr);
}
// decimal digits = ceiling((bits)*ln(2)/ln(10))
StringBuffer&
StringBuffer::operator += (Real32 v)
{
   char bfr[128];
#if FLT_RADIX == 2
#if defined(BLOCXX_REAL32_IS_FLOAT)
   ::snprintf(bfr, sizeof(bfr), "%.*g", FLT_MANT_DIG * 3 / 10 + 1, static_cast<double>(v));
#elif defined(BLOCXX_REAL32_IS_DOUBLE)
   ::snprintf(bfr, sizeof(bfr), "%.*g", DBL_MANT_DIG * 3 / 10 + 1, v);
#endif
#else
#error "The formula for computing the number of digits of precision for a floating point needs to be implmented. It's ceiling(bits * log(FLT_RADIX) / log(10))"
#endif
   return append(bfr);
}
StringBuffer&
StringBuffer::operator += (Real64 v)
{
   char bfr[32];
#if FLT_RADIX == 2
#if defined(BLOCXX_REAL64_IS_DOUBLE)
   ::snprintf(bfr, sizeof(bfr), "%.*g", DBL_MANT_DIG * 3 / 10 + 1, v);
#elif defined(BLOCXX_REAL64_IS_LONG_DOUBLE)
   ::snprintf(bfr, sizeof(bfr), "%.*Lg", LDBL_MANT_DIG * 3 / 10 + 1, v);
#endif
#else
#error "The formula for computing the number of digits of precision for a floating point needs to be implmented. It's ceiling(bits * log(FLT_RADIX) / log(10))"
#endif
   return append(bfr);
}
#if defined(BLOCXX_WIN32)
#undef snprintf
#endif

StringBuffer&
StringBuffer::append(const char* str, const size_t len)
{
   checkAvail(len+1);
   ::strncpy(m_bfr+m_len, str, len);
   m_len += len;
   m_bfr[m_len] = '\0';
   return *this;
}
bool
StringBuffer::equals(const char* arg) const
{
   return ::strcmp(arg, m_bfr) == 0;
}

bool
StringBuffer::equals(const StringBuffer& arg) const
{
   return ::strcmp(arg.m_bfr, m_bfr) == 0;
}

bool
StringBuffer::endsWith(char ch) const
{
   return (m_len && m_bfr[m_len-1] == ch);
}

bool
StringBuffer::startsWith(char ch) const
{
   return (m_len && m_bfr[0] == ch);
}

void
StringBuffer::chop()
{
   if (m_len)
   {
      truncate(m_len-1);
   }
}

void
StringBuffer::trim()
{
   if (m_len)
   {
      while (m_len && isspace(m_bfr[m_len-1]))
      {
         m_bfr[--m_len] = 0;
      }

      if (m_len)
      {
         char *p = m_bfr;
         while (*p && isspace(*p))
         {
            ++p;
         }

         if (*p && p > m_bfr)
         {
            m_len -= (p - m_bfr);
            memmove(m_bfr, p, m_len+1);
         }
      }
   }
}
      
// Get one line from an input stream. This StringBuffer object will be
// reset (cleared) before an attempt is made to retrieve the line.
const char*
StringBuffer::getLine(std::istream& is, bool resetBuffer)
{
   if (resetBuffer)
   {
      reset();
   }

   if (is)
   {
      size_t count = 0;
      std::streambuf *sb = is.rdbuf();
      
      while (1)
      {
         int ch = sb->sbumpc();
         if (ch == EOF)
         {
            is.setstate(count == 0
               ? (std::ios::failbit | std::ios::eofbit) : std::ios::eofbit);
            break;
         }
         
         ++count;
         
         if (ch == '\n')
         {
            break;
         }

         append(static_cast<char>(ch));
      }
   }

   const char* p = ::strchr(m_bfr, '\r');
   if (p)
   {
      truncate(size_t(p-m_bfr));
   }

   return m_bfr;
}

std::ostream& operator<<(std::ostream& ostr, const StringBuffer& b)
{
   ostr.write(b.c_str(), b.length());
   return ostr;
}

bool operator==(const StringBuffer& x, const StringBuffer& y)
{
   return x.equals(y);
}

bool operator!=(const StringBuffer& x, const StringBuffer& y)
{
   return !(x == y);
}

bool operator==(const StringBuffer& x, const String& y)
{
   return x.equals(y.c_str());
}

bool operator!=(const StringBuffer& x, const String& y)
{
   return !(x == y);
}

bool operator==(const String& x, const StringBuffer& y)
{
   return x.equals(y.c_str());
}

bool operator!=(const String& x, const StringBuffer& y)
{
   return !(x == y);
}

} // end namespace BLOCXX_NAMESPACE