?? cdb_seek.c
字號:
#include <sys/types.h>#include <errno.h>#include "cdb.h"#ifndef SEEK_SET#define SEEK_SET 0#endifint cdb_bread(fd,buf,len)int fd;char *buf;int len;{ int r; while (len > 0) { do r = read(fd,buf,len); while ((r == -1) && (errno == EINTR)); if (r == -1) return -1; if (r == 0) { errno = EIO; return -1; } buf += r; len -= r; } return 0;}static int match(fd,key,len)int fd;char *key;unsigned int len;{ char buf[32]; int n; int i; while (len > 0) { n = sizeof(buf); if (n > len) n = len; if (cdb_bread(fd,buf,n) == -1) return -1; for (i = 0;i < n;++i) if (buf[i] != key[i]) return 0; key += n; len -= n; } return 1;}int cdb_seek(fd,key,len,dlen)int fd;char *key;unsigned int len;uint32 *dlen;{ char packbuf[8]; uint32 pos; uint32 h; uint32 lenhash; uint32 h2; uint32 loop; uint32 poskd; h = cdb_hash(key,len); pos = 8 * (h & 255); if (lseek(fd,(off_t) pos,SEEK_SET) == -1) return -1; if (cdb_bread(fd,packbuf,8) == -1) return -1; pos = cdb_unpack(packbuf); lenhash = cdb_unpack(packbuf + 4); if (!lenhash) return 0; h2 = (h >> 8) % lenhash; for (loop = 0;loop < lenhash;++loop) { if (lseek(fd,(off_t) (pos + 8 * h2),SEEK_SET) == -1) return -1; if (cdb_bread(fd,packbuf,8) == -1) return -1; poskd = cdb_unpack(packbuf + 4); if (!poskd) return 0; if (cdb_unpack(packbuf) == h) { if (lseek(fd,(off_t) poskd,SEEK_SET) == -1) return -1; if (cdb_bread(fd,packbuf,8) == -1) return -1; if (cdb_unpack(packbuf) == len) switch(match(fd,key,len)) { case -1: return -1; case 1: *dlen = cdb_unpack(packbuf + 4); return 1; } } if (++h2 == lenhash) h2 = 0; } return 0;}?? 快捷鍵說明
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