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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* Make a db.h that will be link-time compatible with Sleepycat's Berkeley DB. */
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#include <db.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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void print_dbtype(void) {
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/* DBTYPE is mentioned by db_open.html */
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printf("typedef enum {\n");
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printf(" DB_BTREE=%d\n", DB_BTREE);
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printf("} DBTYPE;\n");
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}
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#define DECL_LIMIT 100
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struct fieldinfo {
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char decl[DECL_LIMIT];
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unsigned int off;
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unsigned int size;
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};
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#include "sample_offsets_32.h"
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#include "sample_offsets_64.h"
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void print_db_struct (void) {
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unsigned int i;
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unsigned int current_32 = 0;
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unsigned int current_64 = 0;
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int dummy_counter=0;
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// int did_toku_internal=0;
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printf("struct __toku_db {\n");
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assert(sizeof(fields32)==sizeof(fields64));
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for (i=0; i<sizeof(fields32)/sizeof(fields32[0]); i++) {
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unsigned int this_32 = fields32[i].off;
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unsigned int this_64 = fields64[i].off;
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assert(strcmp(fields32[i].decl, fields64[i].decl)==0);
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#if 0
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if (!did_toku_internal && this_offset+sizeof(void*)>current_offset) {
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printf(" struct __tokudb_internal *i;\n");
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current_offset+=sizeof(void*);
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did_toku_internal=1;
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}
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#endif
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if (this_32 > current_32 || this_64 > current_64) {
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unsigned int diff32 = this_32-current_32;
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unsigned int diff64 = this_64-current_64;
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assert(this_32 > current_32 && this_64 > current_64);
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if (diff32!=diff64) {
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unsigned int diff = diff64-diff32;
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printf(" void* dummy%d[%d];\n", dummy_counter++, diff/4);
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diff64-=diff*2;
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diff32-=diff;
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}
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assert(diff32==diff64);
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if (diff32>0) {
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printf(" char dummy%d[%d];\n", dummy_counter++, diff32);
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}
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current_32 = this_32;
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current_64 = this_64;
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}
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if (this_32<current_32 || this_64<current_64) {
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printf("Whoops\n");
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}
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printf(" %s; /* 32-bit offset=%d size=%d, 64=bit offset=%d size=%d */\n", fields32[i].decl, fields32[i].off, fields32[i].size, fields64[i].off, fields64[i].size);
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current_32 += fields32[i].size;
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current_64 += fields64[i].size;
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}
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printf("};\n");
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}
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int main (int argc __attribute__((__unused__)), char *argv[] __attribute__((__unused__))) {
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printf("#ifndef _DB_H\n");
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printf("#define _DB_H\n");
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printf("/* This code generated by make_db_h. Copyright (c) 2007 Tokutek */\n");
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printf("#if defined(__cplusplus)\nextern \"C\" {\n#endif\n");
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printf("typedef struct __toku_db DB;\n");
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print_dbtype();
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print_db_struct();
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printf("#if defined(__cplusplus)\n}\n#endif\n");
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printf("#endif\n");
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return 0;
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}
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