1. wxProcess changes to make capturing subprocess output easier (and more

reliable), now works in both sync and async modes
2. wxSafeYieldBug() corrected, wxWindowDisabler which is now used in it
   added and documented
3. exec sample updated to illustrate capturing the subprocess output
4. wxStreamBase::IsOk() added
5. wxInputStream::Eof() added and non-blocking Eof() implementation in
   wxPipeInputStream used by wxExecute


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6400 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/stream.cpp

@@ -236,7 +236,7 @@ char wxStreamBuffer::GetChar()
   }
 
   GetFromBuffer(&c, 1);
-  
+
   m_stream->m_lastcount = 1;
   return c;
 }
@@ -262,7 +262,7 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size)
   size_t buf_left, orig_size = size;
 
   while (size > 0) {
-    buf_left = GetDataLeft(); 
+    buf_left = GetDataLeft();
 
     // First case: the requested buffer is larger than the stream buffer,
     //             we split it.
@@ -428,10 +428,10 @@ off_t wxStreamBuffer::Tell() const
         return wxInvalidOffset;
 
     pos += GetIntPosition();
-	
+
     if (m_mode == read && m_flushable)
         pos -= GetLastAccess();
-    
+
     return pos;
 }
 
@@ -440,7 +440,7 @@ size_t wxStreamBuffer::GetDataLeft()
     /* Why is this done? RR. */
     if (m_buffer_end == m_buffer_pos && m_flushable)
         FillBuffer();
-	
+
     return m_buffer_end-m_buffer_pos;
 }
 
@@ -494,6 +494,22 @@ wxInputStream::~wxInputStream()
     free(m_wback);
 }
 
+bool wxInputStream::Eof() const
+{
+    wxInputStream *self = (wxInputStream *)this;    // const_cast
+
+    char c;
+    self->Read(&c, 1);
+    if ( GetLastError() == wxSTREAM_EOF )
+    {
+        return TRUE;
+    }
+
+    self->Ungetch(c);
+
+    return FALSE;
+}
+
 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 {
     /* get number of bytes left from previous wback buffer */
@@ -533,14 +549,14 @@ size_t wxInputStream::GetWBack(char *buf, size_t bsize)
     memcpy(buf, (m_wback+m_wbackcur), s_toget);
 
     m_wbackcur += s_toget;
-    if (m_wbackcur == m_wbacksize) 
+    if (m_wbackcur == m_wbacksize)
     {
         free(m_wback);
         m_wback = (char *)NULL;
         m_wbacksize = 0;
         m_wbackcur = 0;
     }
-    
+
     return s_toget;
 }
 
@@ -549,7 +565,7 @@ size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
     char *ptrback = AllocSpaceWBack(bufsize);
     if (!ptrback)
         return 0;
- 
+
     memcpy(ptrback, buf, bufsize);
     return bufsize;
 }
@@ -576,7 +592,7 @@ wxInputStream& wxInputStream::Read(void *buffer, size_t size)
     char *buf = (char *)buffer;
 
     size_t retsize = GetWBack(buf, size);
-    if (retsize == size) 
+    if (retsize == size)
     {
         m_lastcount = size;
         m_lasterror = wxStream_NOERROR;
@@ -593,21 +609,21 @@ char wxInputStream::Peek()
 {
     char c;
     Read(&c, 1);
-    if (m_lasterror == wxStream_NOERROR) 
+    if (m_lasterror == wxStream_NOERROR)
     {
         Ungetch(c);
         return c;
     }
-    
+
     return 0;
 }
 
 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 {
-    char buf[BUF_TEMP_SIZE]; 
+    char buf[BUF_TEMP_SIZE];
     size_t bytes_read = BUF_TEMP_SIZE;
 
-    while (bytes_read == BUF_TEMP_SIZE) 
+    while (bytes_read == BUF_TEMP_SIZE)
     {
         bytes_read = Read(buf, bytes_read).LastRead();
         bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
@@ -619,7 +635,7 @@ off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 {
     /* Should be check and improve, just to remove a slight bug !
        I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ? */
-    if (m_lasterror==wxSTREAM_EOF) 
+    if (m_lasterror==wxSTREAM_EOF)
         m_lasterror=wxSTREAM_NOERROR;
 
     /* A call to SeekI() will automatically invalidate any previous call
@@ -632,7 +648,7 @@ off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
        when seeking in wxFromCurrent mode, else it would invalidate
        anyway...
      */
-    if (m_wback) 
+    if (m_wback)
     {
         free(m_wback);
         m_wback = (char*) NULL;
@@ -750,9 +766,9 @@ off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
         m_currentPos = m_lastcount + pos;
     else
         m_currentPos += pos;
-    
+
     if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
-  
+
     return m_currentPos;
 }
 
@@ -760,7 +776,7 @@ off_t wxCountingOutputStream::OnSysTell() const
 {
     return m_currentPos;
 }
-  
+
 // ----------------------------------------------------------------------------
 // wxFilterInputStream
 // ----------------------------------------------------------------------------
@@ -828,7 +844,7 @@ wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 
     retsize = GetWBack(buf, size);
     m_lastcount = retsize;
-    if (retsize == size) 
+    if (retsize == size)
     {
         m_lasterror = wxStream_NOERROR;
         return *this;