From 7e0f021a9aec35fd8e6725e87e3313b101d26f5e Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Sun, 27 Jan 2008 11:37:44 +0100
Subject: Initial import (2.0.2-6)

---
 reference/C/CONTRIB/SNIP/myio.cpp | 127 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100755 reference/C/CONTRIB/SNIP/myio.cpp

(limited to 'reference/C/CONTRIB/SNIP/myio.cpp')

diff --git a/reference/C/CONTRIB/SNIP/myio.cpp b/reference/C/CONTRIB/SNIP/myio.cpp
new file mode 100755
index 0000000..efe6f59
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/myio.cpp
@@ -0,0 +1,127 @@
+// Myio.cpp
+// Simple I/O class to demonstrate use of C++ iostream
+// facilities in a customised environment
+// Written by David L Nugent, June 1993
+
+# include <iostream.h>
+# include <string.h>
+# include "Myio.h"
+# include "Mystream.h"
+
+Myio::Myio (int sz)
+    : bufsize(sz), bufchars(0), bufidx(0),
+      bufaddr(new char[bufsize]), mystream(0)
+{}
+
+Myio::~Myio (void)
+{
+    delete bufaddr;
+    delete mystream;
+}
+
+iostream &
+Myio::stream (void)
+{
+    if (!mystream)      // Create a stream if required
+        mystream = new Mystream(this);
+    return *mystream;
+}
+
+int         // Simple write function into a circular buffer
+Myio::write (char const * buf, int len)
+{
+    int avail = (bufsize - bufchars);   // See how many fit
+    if (len > avail)
+    {
+        len = avail;
+        stat |= Myio::overflow;         // Only partial write
+    }
+    else
+        stat &= ~Myio::overflow;
+    avail = bufsize - bufidx;           // Caculate room at end
+    if (avail > len)
+        avail = len;
+    if (avail)
+    {
+        memcpy (bufaddr + bufidx, buf, avail);
+        bufidx += avail;                // Update the put index
+        buf += avail;                   // And the input pointer
+    }
+    if (bufidx >= bufsize)              // Wrap buffer to start
+        bufidx = 0;
+    avail = len - avail;                // See if there is any more to go
+    if (avail)
+    {
+        memcpy (bufaddr + bufidx, buf, avail);
+        bufidx += avail;                // Update the put index
+    }
+    bufchars += len;
+    return (_pcount = len);
+}
+
+int         // Simple read function from a circular buffer
+Myio::read (char * buf, int len)
+{
+    if (len > bufchars)                 // Adjust for available bytes
+    {
+        len = bufchars;
+        stat |= Myio::underflow;        // Got an underflow (partial read)
+    }
+    else
+        stat &= ~Myio::underflow;       // Clear underflow flag
+    int startidx = bufidx - bufchars;   // Determine start get position
+    if (startidx < 0)
+        startidx += bufsize;            // Adjust for wrap
+    int avail = bufsize - startidx;     // Check room at end of buffer
+    if (avail > len)                    // Adjust down if necessary
+        avail = len;
+    if (avail)                          // Copy first section
+    {
+        memcpy (buf, bufaddr + startidx, avail);
+        startidx += avail;              // Adjust start index
+        buf += avail;                   // Adjust output pointer
+    }
+    if (startidx >= bufsize)            // Wrap buffer to start
+        startidx = 0;
+    avail = len - avail;                // See if there is any more to go
+    if (avail)                          // If so, copy the rest
+        memcpy (buf, bufaddr + startidx, avail);
+    bufchars -= len;                    // Adjust character count
+    return (_gcount = len);
+}
+
+Myio &
+operator<< (Myio & m, char const * ptr)
+{
+    m.write (ptr, strlen (ptr));
+    return m;
+}
+
+int
+Myio::dump (void) const
+{
+    if (bufchars)
+    {
+        char * tmp = new char[bufchars + 2];
+        int idx = bufidx - bufchars;
+        if (idx < 0)
+            idx += bufsize;
+        for (int i = 0; i < bufchars; )
+        {
+            if (idx >= bufsize)
+                idx = 0;
+            tmp[i++] = bufaddr[idx++];
+        }
+        if (i)
+        {
+            if (tmp[i-1] != '\n')   // Terminate with NL
+                tmp[i++] = '\n';
+            tmp[i] = 0;
+            cout << "---\n"
+                 << tmp
+                 << "---\n";
+        }
+        delete tmp;
+    }
+    return bufchars;
+}
-- 
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