?? cdb_make_put.c
字號:
/* "advanced" cdb_make_put routine * * This file is a part of tinycdb package by Michael Tokarev, mjt@corpit.ru. * Public domain. */#include "common/setup_before.h"#ifdef STDC_HEADERS# include <stdlib.h>#else# ifdef HAVE_MALLOC_H# include <malloc.h># endif#endif#include "common/xalloc.h"#include "cdb_int.h"#include "common/setup_after.h"intcdb_make_put(struct cdb_make *cdbmp, const void *key, unsigned klen, const void *val, unsigned vlen, int flags){ unsigned char rlen[8]; unsigned hval = cdb_hash(key, klen); struct cdb_rl *rl; int c, r; switch(flags) { case CDB_PUT_REPLACE: case CDB_PUT_INSERT: case CDB_PUT_WARN: c = _cdb_make_find(cdbmp, key, klen, hval, &rl); if (c < 0) return -1; if (c) { if (flags == CDB_PUT_INSERT) return errno = EEXIST, 1; else if (flags == CDB_PUT_REPLACE) { --c; r = 1; break; } else r = 1; } /* fall */ case CDB_PUT_ADD: rl = cdbmp->cdb_rec[hval&255]; if (!rl || rl->cnt >= sizeof(rl->rec)/sizeof(rl->rec[0])) { rl = (struct cdb_rl*)xmalloc(sizeof(struct cdb_rl)); if (!rl) return errno = ENOMEM, -1; rl->cnt = 0; rl->next = cdbmp->cdb_rec[hval&255]; cdbmp->cdb_rec[hval&255] = rl; } c = rl->cnt; r = 0; break; default: return errno = EINVAL, -1; } if (klen > 0xffffffff - (cdbmp->cdb_dpos + 8) || vlen > 0xffffffff - (cdbmp->cdb_dpos + klen + 8)) return errno = ENOMEM, -1; rl->rec[c].hval = hval; rl->rec[c].rpos = cdbmp->cdb_dpos; if ((unsigned)c == rl->cnt) { ++rl->cnt; ++cdbmp->cdb_rcnt; } cdb_pack(klen, rlen); cdb_pack(vlen, rlen + 4); if (_cdb_make_write(cdbmp, rlen, 8) < 0 || _cdb_make_write(cdbmp, key, klen) < 0 || _cdb_make_write(cdbmp, val, vlen) < 0) return -1; return r;}
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