ENH: Adding KWSys component IOStream to provide help with broken C++ stream libraries.

1 files changed, 270 insertions, 0 deletions

diff --git a/Source/kwsys/IOStream.cxx b/Source/kwsys/IOStream.cxx
new file mode 100644
index 0000000..2e1a379
--- /dev/null
+++ b/Source/kwsys/IOStream.cxx
@@ -0,0 +1,270 @@
+/*=========================================================================
+
+  Program:   KWSys - Kitware System Library
+  Module:    $RCSfile$
+
+  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "kwsysPrivate.h"
+#include KWSYS_HEADER(Configure.hxx)
+
+// Configure the implementation for the current streams library.
+#if !KWSYS_IOS_USE_ANSI
+# define ios_base ios
+# if defined(__HP_aCC)
+#  define protected public
+#  include <iostream.h> // Hack access to some private stream methods.
+#  undef protected
+# endif
+#endif
+
+// Include the streams library.
+#include KWSYS_HEADER(ios/iostream)
+#include KWSYS_HEADER(IOStream.hxx)
+
+// Work-around CMake dependency scanning limitation.  This must
+// duplicate the above list of headers.
+#if 0
+# include "Configure.hxx.in"
+# include "kwsys_ios_iostream.hxx.in"
+# include "IOStream.hxx.in"
+#endif
+
+// Implement the rest of this file only if it is needed.
+#if KWSYS_IOS_NEED_OPERATORS_LL
+
+# include <stdio.h>  // sscanf, sprintf
+# include <string.h> // memchr
+
+# if defined(_MAX_INT_DIG)
+#  define KWSYS_IOS_INT64_MAX_DIG _MAX_INT_DIG
+# else
+#  define KWSYS_IOS_INT64_MAX_DIG 32
+# endif
+
+namespace KWSYS_NAMESPACE
+{
+
+// Scan an input stream for an integer value.
+static int IOStreamScanStream(kwsys_ios::istream& is, char* buffer)
+{
+  // Prepare to write to buffer.
+  char* out = buffer;
+  char* end = buffer + KWSYS_IOS_INT64_MAX_DIG - 1;
+
+  // Look for leading sign.
+  if(is.peek() == '+') { *out++ = '+'; is.ignore(); }
+  else if(is.peek() == '-') { *out++ = '-'; is.ignore(); }
+
+  // Determine the base.  If not specified in the stream, try to
+  // detect it from the input.  A leading 0x means hex, and a leading
+  // 0 alone means octal.
+  int base = 0;
+  int flags = is.flags() & kwsys_ios::ios_base::basefield;
+  if(flags == kwsys_ios::ios_base::oct) { base = 8; }
+  else if(flags == kwsys_ios::ios_base::dec) { base = 10; }
+  else if(flags == kwsys_ios::ios_base::hex) { base = 16; }
+  bool foundDigit = false;
+  bool foundNonZero = false;
+  if(is.peek() == '0')
+    {
+    foundDigit = true;
+    is.ignore();
+    if((is.peek() == 'x' || is.peek() == 'X') && (base == 0 || base == 16))
+      {
+      base = 16;
+      foundDigit = false;
+      is.ignore();
+      }
+    else if (base == 0)
+      {
+      base = 8;
+      }
+    }
+
+  // Determine the range of digits allowed for this number.
+  const char* digits = "0123456789abcdefABCDEF";
+  int maxDigitIndex = 10;
+  if(base == 8)
+    {
+    maxDigitIndex = 8;
+    }
+  else if(base == 16)
+    {
+    maxDigitIndex = 10+6+6;
+    }
+
+  // Scan until an invalid digit is found.
+  for(;is.peek() != EOF; is.ignore())
+    {
+    if(memchr(digits, *out = (char)is.peek(), maxDigitIndex) != 0)
+      {
+      if((foundNonZero || *out != '0') && out < end)
+        {
+        ++out;
+        foundNonZero = true;
+        }
+      foundDigit = true;
+      }
+    else
+      {
+      break;
+      }
+    }
+
+  // Correct the buffer contents for degenerate cases.
+  if(foundDigit && !foundNonZero)
+    {
+    *out++ = '0';
+    }
+  else if (!foundDigit)
+    {
+    out = buffer;
+    }
+
+  // Terminate the string in the buffer.
+  *out = '\0';
+
+  return base;
+}
+
+// Read an integer value from an input stream.
+template <class T>
+kwsys_ios::istream&
+IOStreamScanTemplate(kwsys_ios::istream& is, T& value, char type)
+{
+  int state = kwsys_ios::ios_base::goodbit;
+
+  // Skip leading whitespace.
+# if KWSYS_IOS_USE_ANSI
+  kwsys_ios::istream::sentry okay(is);
+# else
+  is.eatwhite();
+  kwsys_ios::istream& okay = is;
+# endif
+
+  if(okay)
+    {
+#   if KWSYS_IOS_USE_ANSI
+    try {
+#   endif
+    // Copy the string to a buffer and construct the format string.
+    char buffer[KWSYS_IOS_INT64_MAX_DIG];
+#   if defined(_MSC_VER)
+    char format[] = "%I64_";
+    const int typeIndex = 4;
+#   else
+    char format[] = "%ll_";
+    const int typeIndex = 3;
+#   endif
+    switch(IOStreamScanStream(is, buffer))
+      {
+      case 8: format[typeIndex] = 'o'; break;
+      case 0: // Default to decimal if not told otherwise.
+      case 10: format[typeIndex] = type; break;
+      case 16: format[typeIndex] = 'x'; break;
+      };
+
+    // Use sscanf to parse the number from the buffer.
+    T result;
+    int success = (sscanf(buffer, format, &result) == 1)?1:0;
+
+    // Set flags for resulting state.
+    if(is.peek() == EOF) { state |= kwsys_ios::ios_base::eofbit; }
+    if(!success) { state |= kwsys_ios::ios_base::failbit; }
+    else { value = result; }
+#   if KWSYS_IOS_USE_ANSI
+    } catch(...) { state |= kwsys_ios::ios_base::badbit; }
+#   endif
+    }
+
+# if KWSYS_IOS_USE_ANSI
+  is.setstate(kwsys_ios::ios_base::iostate(state));
+# else
+  is.clear(state);
+# endif
+  return is;
+}
+
+// Print an integer value to an output stream.
+template <class T>
+kwsys_ios::ostream&
+IOStreamPrintTemplate(kwsys_ios::ostream& os, T value, char type)
+{
+# if KWSYS_IOS_USE_ANSI
+  kwsys_ios::ostream::sentry okay(os);
+# else
+  kwsys_ios::ostream& okay = os;
+# endif
+  if(okay)
+    {
+#   if KWSYS_IOS_USE_ANSI
+    try {
+#   endif
+    // Construct the format string.
+    char format[8];
+    char* f = format;
+    *f++ = '%';
+    if(os.flags() & kwsys_ios::ios_base::showpos) { *f++ = '+'; }
+    if(os.flags() & kwsys_ios::ios_base::showbase) { *f++ = '#'; }
+#   if defined(_MSC_VER)
+    *f++ = 'I'; *f++ = '6'; *f++ = '4';
+#   else
+    *f++ = 'l'; *f++ = 'l';
+#   endif
+    long bflags = os.flags() & kwsys_ios::ios_base::basefield;
+    if(bflags == kwsys_ios::ios_base::oct) { *f++ = 'o'; }
+    else if(bflags != kwsys_ios::ios_base::hex) { *f++ = type; }
+    else if(os.flags() & kwsys_ios::ios_base::uppercase) { *f++ = 'X'; }
+    else { *f++ = 'x'; }
+    *f = '\0';
+
+    // Use sprintf to print to a buffer and then write the
+    // buffer to the stream.
+    char buffer[2*KWSYS_IOS_INT64_MAX_DIG];
+    sprintf(buffer, format, value);
+    os << buffer;
+#   if KWSYS_IOS_USE_ANSI
+    } catch(...) { os.clear(os.rdstate() | kwsys_ios::ios_base::badbit); }
+#   endif
+    }
+  return os;
+}
+
+# if !KWSYS_IOS_HAS_ISTREAM_LONG_LONG
+// Implement input stream operator for IOStreamSLL.
+kwsys_ios::istream& IOStreamScan(kwsys_ios::istream& is, IOStreamSLL& value)
+{
+  return IOStreamScanTemplate(is, value, 'd');
+}
+
+// Implement input stream operator for IOStreamULL.
+kwsys_ios::istream& IOStreamScan(kwsys_ios::istream& is, IOStreamULL& value)
+{
+  return IOStreamScanTemplate(is, value, 'u');
+}
+# endif
+
+# if !KWSYS_IOS_HAS_OSTREAM_LONG_LONG
+// Implement output stream operator for IOStreamSLL.
+kwsys_ios::ostream& IOStreamPrint(kwsys_ios::ostream& os, IOStreamSLL value)
+{
+  return IOStreamPrintTemplate(os, value, 'd');
+}
+
+// Implement output stream operator for IOStreamULL.
+kwsys_ios::ostream& IOStreamPrint(kwsys_ios::ostream& os, IOStreamULL value)
+{
+  return IOStreamPrintTemplate(os, value, 'u');
+}
+# endif
+
+} // namespace KWSYS_NAMESPACE
+
+#endif // KWSYS_IOS_NEED_OPERATORS_LL