don't return uninitialized memory from bdiff.blocks() bdiff.blocks() returns a dummy match at the end of both files; the length of that chunk is never set, so it will sometimes contain random heap garbage. There are apparently workarounds for this elsewhere: # bdiff sometimes gives huge matches past eof, this check eats them,

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% init

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% commit

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adding base

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% qnew mqbase

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% qrefresh

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% qdiff

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diff -r 67e992f2c4f3 base

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--- a/base

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+++ b/base

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@@ -1,1 +1,1 @@ base

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-base

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+patched

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% qdiff dirname

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diff -r 67e992f2c4f3 base

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--- a/base

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+++ b/base

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@@ -1,1 +1,1 @@ base

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-base

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+patched