#include <stdio.h>#include <stdlib.h>#include <string.h>#include <fcntl.h>#ifdef __OLD_DB__#include <db1/db.h>#else#include <db_185.h>#endif#include "nmea/gpgll.h"#include "gps_db.h"#include "skan.h"#include "skan_config.h"extern gtkskan_config_t skan_conf;static DB * gps_db = NULL;/* i'm not checking the return values here because i don't remember what    they are and don't have the man page handy */void gps_db_open(void){  GString *path = g_string_new(g_get_home_dir());  BTREEINFO infozzz = { R_DUP, 0, 0, 0, 0, 0, 0, 0 };  g_string_append(path, "/.gtkskan-gps-db");  if(gps_db == NULL) {    gps_db = dbopen(path->str, O_RDWR|O_CREAT, 0664, DB_BTREE, &infozzz);    atexit(gps_db_close);    g_string_free(path, TRUE);  }}void gps_db_sync(void){  gps_db_open();  (gps_db)->sync(gps_db, 0);}void gps_db_close(void){  if(gps_db != NULL) {    (gps_db)->close(gps_db);  }}int gps_db_save_data(gps_gpgll *gps, char *ap_mac, int strength){  DBT key   = { 0, 0 };  DBT value = { 0, 0 };  char keybuf[strlen(ap_mac) + 4];  gps_db_open();  memset(keybuf, 0, sizeof(keybuf));  sprintf(keybuf, "%s%d", ap_mac, strength);  key.data   = keybuf;  key.size   = strlen(keybuf) + 1;  value.data = gps;  value.size = sizeof(gps_gpgll);  (gps_db)->put(gps_db, &key, &value, 0);  return 1;}gps_record * gps_db_lookup_strongest(const char *ap_mac){  DBT key    = { 0, 0 };  DBT value  = { 0, 0 };  char keybuf[strlen(ap_mac) + 1];  if(ap_mac == NULL)    return 0;  key.data = keybuf;  key.size = strlen(ap_mac) + 1;    strcpy(keybuf, ap_mac);  keybuf[strlen(ap_mac)] += 1;  gps_db_open();  if((gps_db)->seq(gps_db, &key, &value, R_CURSOR) < 0) {    if((gps_db)->seq(gps_db, &key, &value, R_LAST) < 0) {      return NULL;    }  }  (gps_db)->seq(gps_db, &key, &value, R_PREV);    if(strncmp((char*)key.data, ap_mac, strlen(ap_mac)) != 0)    return NULL;    if(value.size == sizeof(gps_gpgll)) {    gps_record * outbuf = (gps_record*)calloc(1, sizeof(gps_record));    memcpy(&outbuf->value, value.data, value.size);    memcpy(outbuf->key.ap_mac, keybuf, 18);    outbuf->key.link_quality = atoi(keybuf+18);    return outbuf;  }    return NULL;}gps_record * gps_db_lookup(const char *ap_mac, int n){  DBT key    = { 0, 0 };  DBT value  = { 0, 0 };  char keybuf[strlen(ap_mac) + 1];  int i = 0;  if(ap_mac == NULL)    return 0;  key.data = keybuf;  key.size = strlen(ap_mac) + 1;    strcpy(keybuf, ap_mac);  gps_db_open();  if((gps_db)->seq(gps_db, &key, &value, R_CURSOR) < 0 ||     strncmp((char*)key.data, ap_mac, strlen(ap_mac)) != 0) {    return NULL;  }  if(n == 0)    goto done; /* ouch - lazy am i */    while(i++ < n) {    if((gps_db)->seq(gps_db, &key, &value, R_NEXT) < 0)      return NULL;    if(strncmp((char*)key.data, ap_mac, strlen(ap_mac)) != 0)      return NULL;  }done:    if(value.size == sizeof(gps_record)) {    gps_record * outbuf = (gps_record*)calloc(1, sizeof(gps_record));    memcpy(&outbuf->value, value.data, value.size);    memcpy(outbuf->key.ap_mac, keybuf, 18);    outbuf->key.link_quality = atoi(keybuf+18);    return outbuf;  }    return NULL;}int gps_db_exists(const char *ap_mac){  DBT key = { 0, 0 };  DBT value = { 0, 0 };  char keybuf[strlen(ap_mac) + 1];  if(ap_mac == NULL)    return 0;  gps_db_open();  key.data  = keybuf;  key.size  = strlen(ap_mac) + 1;  strcpy(keybuf, ap_mac);  if((gps_db)->seq(gps_db, &key, &value, R_CURSOR) >= 0) {    if(strncmp((char*)key.data, ap_mac, strlen(ap_mac)) == 0) {      return 1;    }  }  return 0;}void gps_db_iterate(void (*func)(gps_record *, void *), void *user){  DBT key   = { 0, 0 };  DBT value = { 0, 0 };  gps_record record;  gps_db_open();  (gps_db)->seq(gps_db, &key, &value, R_FIRST);  if(key.size == 0)    return;  do {    memset(&record, 0, sizeof(record));    memcpy(&(record.value), value.data, sizeof(gps_record));    memcpy(record.key.ap_mac, key.data, 18);    record.key.link_quality = atoi((char*)key.data + 18);    func(&record, user);  } while((gps_db)->seq(gps_db, &key, &value, R_NEXT) == 0);    }