[Tcl-bugs] [ tcl-Bugs-771942 ] tclIO.c: compiler warning

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Bugs item #771942, was opened at 2003-07-15 15:58
Message generated for change (Comment added) made by andreas_kupries
You can respond by visiting: 
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Category: 25. Channel System
Group: = 8.4.3
Status: Open
Resolution: None
>Priority: 3
Submitted By: Don Porter (dgp)
Assigned to: Andreas Kupries (andreas_kupries)
Summary: tclIO.c: compiler warning

Initial Comment:

SGI compiler warns:

"./../generic/tclIO.c", line 3954: warning(1172):
subscript out of range
            memcpy((VOID *) (nextPtr->buf +
BUFFER_PADDING - extra),
                                            ^

"./../generic/tclIO.c", line 4102: warning(1172):
subscript out of range
                        (VOID *) (nextPtr->buf +
BUFFER_PADDING - extra),
                                                 ^


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>Comment By: Andreas Kupries (andreas_kupries)
Date: 2003-10-21 16:55

Message:
Logged In: YES 
user_id=75003

This cannot be fixed I believe. The buf in the ChannelBuffer 
structure is declared as 4 chars long, and we allocate enough 
to hold the buffer. The compiler obviously finds a constant 
subscript which is greater 4 and thus warns about it. We 
know that the reference is in the allocated range, which is 
greater than the declared range. I have no idea how to 
rewrite the code to either fake out the compiler, or to tell the 
compiler to ignore problems of this type.

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