Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtinfo/DtMmdb/utility/streambuf.C

@@ -0,0 +1,139 @@
+/* $XConsortium: streambuf.C /main/8 1996/08/21 15:55:14 drk $ */
+#include "utility/c_streambuf.h"
+
+#if !defined(USL) && !defined(__osf__)
+#include <libc.h>
+#endif
+
+#if defined(USL) || defined(__osf__)
+#include <stdlib.h>
+#endif
+
+#define DEF_BUF_SIZ 4096
+
+streambuf::streambuf() : _size(0), _capacity(DEF_BUF_SIZ), _alloc(1),
+   _pcount(0), _gcount(0)
+{
+   base = (char*)malloc(DEF_BUF_SIZ);
+   end = base + DEF_BUF_SIZ;
+   get_ptr = put_ptr = base;
+}
+
+streambuf::streambuf(char* p, int l, int bufferFull) :
+    base(p), end(p+l), put_ptr(p), get_ptr(p), _size(0), _capacity(l), 
+    _alloc(0), _pcount(0), _gcount(0)
+{
+   if (bufferFull) {
+     _size = l;
+   }
+}
+
+streambuf::~streambuf()
+{
+   if ( _alloc )
+      free(base);
+}
+
+int streambuf::examine()
+{
+   notify(GET);
+
+   if ( empty() && underflow() == EOF )
+      return EOF;
+
+   return (unsigned char)(*get_ptr);
+}
+
+int streambuf::get()
+{
+   notify(GET);
+
+   if ( empty() && underflow() == EOF )
+      return EOF;
+
+   int x = (unsigned char)(*get_ptr);
+
+   move_get_ptr(+1);
+
+   _size--;
+
+   _gcount++;
+
+   return x;
+}
+
+int streambuf::putback(char c)
+{
+   if ( full() )
+      return EOF;
+
+   move_get_ptr(-1);
+
+   _size++;
+
+   *get_ptr = c;
+   return 0;
+}
+
+int streambuf::put(char c)
+{
+   notify(PUT);
+
+   if ( full() && overflow() == EOF )
+      return EOF;
+
+   *put_ptr = c;
+
+   move_put_ptr(1);
+
+   _size++;
+   _pcount++;
+
+   return 0;
+}
+
+int streambuf::move_get_ptr(int one)
+{
+   switch (one) {
+     case 1:
+
+       get_ptr++;  
+       if ( get_ptr == end )
+         get_ptr = base;
+
+       return 0;
+
+     case -1:
+
+       get_ptr--;  
+       if ( get_ptr == base-1 )
+         get_ptr = end-1;
+
+       return 0;
+
+     default:
+       return EOF;
+   }
+
+}
+
+int streambuf::move_put_ptr(int one)
+{
+   switch (one) {
+     case 1:
+
+       if ( get_ptr == 0 )
+          get_ptr = put_ptr;
+
+       put_ptr++; 
+
+       if ( put_ptr == end )
+         put_ptr = base;
+
+       return 0;
+
+      default:
+          return EOF;
+   }
+}
+