| 1 | /* emacs edit mode for this file is -*- C -*- */ |
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| 2 | /* $Id$ */ |
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| 3 | |
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| 4 | #define _POSIX_SOURCE 1 |
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| 5 | |
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| 6 | #include <config.h> |
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| 7 | |
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| 8 | #include <stdlib.h> |
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| 9 | |
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| 10 | #include "cf_assert.h" |
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| 11 | |
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| 12 | #include "memutil.h" |
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| 13 | |
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| 14 | |
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| 15 | typedef struct dummy_le { |
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| 16 | struct dummy_le* next; |
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| 17 | } listentry; |
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| 18 | |
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| 19 | static listentry * blocklist[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL }; |
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| 20 | |
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| 21 | #define GETBLOCK( list, size ) { \ |
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| 22 | if ( blocklist[list] ) { \ |
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| 23 | listentry* retval = blocklist[list]; \ |
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| 24 | blocklist[list] = retval->next; \ |
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| 25 | return (void*)retval; \ |
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| 26 | } \ |
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| 27 | else { \ |
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| 28 | char* retval = (char*)malloc( size ); \ |
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| 29 | *((int*)retval) = size-4; \ |
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| 30 | retval += 4; \ |
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| 31 | return (void*)retval; \ |
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| 32 | } \ |
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| 33 | } |
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| 34 | |
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| 35 | void* getBlock ( size_t size ) |
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| 36 | { |
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| 37 | if ( size <= 4 ) |
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| 38 | GETBLOCK( 0, 8 ) |
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| 39 | else if ( size <= 12 ) |
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| 40 | GETBLOCK( 1, 16 ) |
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| 41 | else if ( size <= 28 ) |
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| 42 | GETBLOCK( 2, 32 ) |
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| 43 | else if ( size <= 60 ) |
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| 44 | GETBLOCK( 3, 64 ) |
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| 45 | else if ( size <= 124 ) |
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| 46 | GETBLOCK( 4, 128 ) |
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| 47 | else if ( size <= 252 ) |
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| 48 | GETBLOCK( 5, 256 ) |
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| 49 | else if ( size <= 508 ) |
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| 50 | GETBLOCK( 6, 512 ) |
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| 51 | else { |
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| 52 | char* retval = (char*)malloc( size+4 ); |
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| 53 | *((int*)retval) = size; |
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| 54 | retval += 4; |
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| 55 | return retval; |
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| 56 | } |
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| 57 | } |
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| 58 | |
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| 59 | #define FREEBLOCK( list, block ) { \ |
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| 60 | listentry* dummy = (listentry*)block; \ |
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| 61 | dummy->next = blocklist[list]; \ |
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| 62 | blocklist[list] = dummy; \ |
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| 63 | } |
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| 64 | |
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| 65 | void freeBlock ( void* block, size_t size ) |
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| 66 | { |
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| 67 | char* dummy = (char*)block; |
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| 68 | if ( block == NULL ) return; |
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| 69 | dummy -= 4; |
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| 70 | size = *((int*)dummy); |
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| 71 | if ( size == 4 ) |
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| 72 | FREEBLOCK( 0, block ) |
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| 73 | else if ( size == 12 ) |
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| 74 | FREEBLOCK( 1, block ) |
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| 75 | else if ( size == 28 ) |
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| 76 | FREEBLOCK( 2, block ) |
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| 77 | else if ( size == 60 ) |
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| 78 | FREEBLOCK( 3, block ) |
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| 79 | else if ( size == 124 ) |
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| 80 | FREEBLOCK( 4, block ) |
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| 81 | else if ( size == 252 ) |
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| 82 | FREEBLOCK( 5, block ) |
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| 83 | else if ( size == 508 ) |
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| 84 | FREEBLOCK( 6, block ) |
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| 85 | else |
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| 86 | free( dummy ); |
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| 87 | } |
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| 88 | |
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| 89 | void* reallocBlock ( void* block, size_t oldsize, size_t newsize ) |
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| 90 | { |
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| 91 | void * dummy; |
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| 92 | #if 1 |
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| 93 | char* dum = (char*)block - 4; |
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| 94 | int size = *((int*)dum); |
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| 95 | if (newsize <= size) return block; |
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| 96 | #endif |
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| 97 | dummy = getBlock( newsize ); |
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| 98 | memcpy( dummy, block, newsize < oldsize ? newsize : oldsize ); |
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| 99 | freeBlock( block, oldsize ); |
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| 100 | return dummy; |
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| 101 | } |
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