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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/crypto/krb5/src/plugins/kdb/db2/libdb2/hash/page.h.patch
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*** /tmp/,RCSt1a21720	Wed Apr  3 11:49:55 1996

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--- page.h	Wed Apr  3 08:42:25 1996

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***************

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*** 158,163

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  #define PAIRFITS(P,K,D)	((PAIRSIZE((K),(D))) <= FREESPACE((P)))

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  #define BIGPAIRFITS(P)	((FREESPACE((P)) >= PAIR_OVERHEAD))

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  #define FREESPACE(P) \

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  	((OFFSET((P)) - PAGE_OVERHEAD - (NUM_ENT((P)) * PAIR_OVERHEAD)))

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--- 158,169 -----

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  #define PAIRFITS(P,K,D)	((PAIRSIZE((K),(D))) <= FREESPACE((P)))

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  #define BIGPAIRFITS(P)	((FREESPACE((P)) >= PAIR_OVERHEAD))

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+ /*

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+  * Since these are all unsigned, we need to guarantee that we never go

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+  * negative.  Offset values are 0-based and overheads are one based (i.e.

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+  * one byte of overhead is 1, not 0), so we need to convert OFFSETs to

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+  * 1-based counting before subtraction.

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+  */

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  #define FREESPACE(P) \

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  	((OFFSET((P)) + 1 - PAGE_OVERHEAD - (NUM_ENT((P)) * PAIR_OVERHEAD)))

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***************

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*** 159,165

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  #define PAIRFITS(P,K,D)	((PAIRSIZE((K),(D))) <= FREESPACE((P)))

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  #define BIGPAIRFITS(P)	((FREESPACE((P)) >= PAIR_OVERHEAD))

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  #define FREESPACE(P) \

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! 	((OFFSET((P)) - PAGE_OVERHEAD - (NUM_ENT((P)) * PAIR_OVERHEAD)))

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  /* 

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   * Overhead on header pages is just one word -- the length of the

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--- 165,171 -----

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   * 1-based counting before subtraction.

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   */

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  #define FREESPACE(P) \

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! 	((OFFSET((P)) + 1 - PAGE_OVERHEAD - (NUM_ENT((P)) * PAIR_OVERHEAD)))

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  /* 

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   * Overhead on header pages is just one word -- the length of the

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