Only define NULL when not defined yet
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@ -5,7 +5,9 @@
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#ifndef _STRING_H
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#ifndef _STRING_H
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#define _STRING_H
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#define _STRING_H
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#ifndef NULL
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#define NULL ((void *)0)
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#define NULL ((void *)0)
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#endif
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#ifndef _SIZE_T
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#ifndef _SIZE_T
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#define _SIZE_T
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#define _SIZE_T
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