SQLite

static void clearYMD_HMS_TZ(DateTime *p){
  p->validYMD = 0;
  p->validHMS = 0;
  p->validTZ = 0;
}

#ifndef SQLITE_OMIT_LOCALTIME

/*
** The following three functions - osLocaltime_r(), osLocaltime_s() and
** osLocaltime() - are wrappers around system functions localtime_r(),
** localtime_s() and localtime(), respectively.
**
** If the sqlite3GlobalConfig.bLocaltimeFault variable is true when one
** of the following wrappers is called, it returns an error.
*/
#ifndef SQLITE_OMIT_BUILTIN_TEST

#ifdef HAVE_LOCALTIME_R
static struct tm * osLocaltime_r(time_t *t, struct tm *pTm){
  if( sqlite3GlobalConfig.bLocaltimeFault ) return 0;
  return localtime_r(t);
}
#elif defined(HAVE_LOCALTIME_S) && HAVE_LOCALTIME_S
static int osLocaltime_s(time_t *t, struct tm *pTm){
  if( sqlite3GlobalConfig.bLocaltimeFault ) return 1;
  return (int)localtime_s(t, pTm);
}
#else
static struct tm * osLocaltime(time_t *t){
  if( sqlite3GlobalConfig.bLocaltimeFault ) return 0;
  return localtime(t);
}
#endif

#else
# define osLocaltime_r(x,y) localtime_r(x,y)
# define osLocaltime_s(x,y) localtime_s(x,y)
# define osLocaltime(x)     localtime(x)
#endif


/*
** Compute the difference (in milliseconds) between localtime and UTC

** (a.k.a. GMT) for the time value p where p is in UTC. If no error occurs,
** return this value and set *pRc to SQLITE_OK. 
**
** Or, if an error does occur, set *pRc to SQLITE_ERROR. The returned value
** is undefined in this case.
*/
static sqlite3_int64 localtimeOffset(
  DateTime *p,                    /* Date at which to calculate offset */
  sqlite3_context *pCtx,          /* Write error here if one occurs */
  int *pRc                        /* OUT: Error code. SQLITE_OK or ERROR */
){
  DateTime x, y;
  time_t t;
  x = *p;
  computeYMD_HMS(&x);
  if( x.Y<1971 || x.Y>=2038 ){
    x.Y = 2000;
    x.M = 1;

  x.tz = 0;
  x.validJD = 0;
  computeJD(&x);
  t = (time_t)(x.iJD/1000 - 21086676*(i64)10000);
#ifdef HAVE_LOCALTIME_R
  {
    struct tm sLocal;
    if( 0==osLocaltime_r(&t, &sLocal) ){
      sqlite3_result_error(pCtx, "error in localtime_r()", -1);
      *pRc = SQLITE_ERROR;
      return 0;
    }
    y.Y = sLocal.tm_year + 1900;
    y.M = sLocal.tm_mon + 1;
    y.D = sLocal.tm_mday;
    y.h = sLocal.tm_hour;
    y.m = sLocal.tm_min;
    y.s = sLocal.tm_sec;
  }
#elif defined(HAVE_LOCALTIME_S) && HAVE_LOCALTIME_S
  {
    struct tm sLocal;
    if( 0!=osLocaltime_s(&t, &sLocal) ){
      sqlite3_result_error(pCtx, "error in localtime_s()", -1);
      *pRc = SQLITE_ERROR;
      return 0;
    }
    y.Y = sLocal.tm_year + 1900;
    y.M = sLocal.tm_mon + 1;
    y.D = sLocal.tm_mday;
    y.h = sLocal.tm_hour;
    y.m = sLocal.tm_min;
    y.s = sLocal.tm_sec;
  }
#else
  {
    struct tm *pTm;
    sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
    pTm = osLocaltime(&t);
    if( pTm ){
      y.Y = pTm->tm_year + 1900;
      y.M = pTm->tm_mon + 1;
      y.D = pTm->tm_mday;
      y.h = pTm->tm_hour;
      y.m = pTm->tm_min;
      y.s = pTm->tm_sec;
    }
    sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
    if( !pTm ){
      sqlite3_result_error(pCtx, "error in localtime()", -1);
      *pRc = SQLITE_ERROR;
      return 0;
    }
  }
#endif
  y.validYMD = 1;
  y.validHMS = 1;
  y.validJD = 0;
  y.validTZ = 0;
  computeJD(&y);
  *pRc = SQLITE_OK;
  return y.iJD - x.iJD;
}
#endif /* SQLITE_OMIT_LOCALTIME */

/*
** Process a modifier to a date-time stamp.  The modifiers are
** as follows:

**     start of week
**     start of day
**     weekday N
**     unixepoch
**     localtime
**     utc
**
** Return 0 on success and 1 if there is any kind of error. If the error
** is in a system call (i.e. localtime()), then an error message is written
** to context pCtx. If the error is an unrecognized modifier, no error is
** written to pCtx.
*/
static int parseModifier(sqlite3_context *pCtx, const char *zMod, DateTime *p){
  int rc = 1;
  int n;
  double r;
  char *z, zBuf[30];
  z = zBuf;
  for(n=0; n<ArraySize(zBuf)-1 && zMod[n]; n++){
    z[n] = (char)sqlite3UpperToLower[(u8)zMod[n]];
  }
  z[n] = 0;
  switch( z[0] ){
#ifndef SQLITE_OMIT_LOCALTIME
    case 'l': {
      /*    localtime
      **
      ** Assuming the current time value is UTC (a.k.a. GMT), shift it to
      ** show local time.
      */
      if( strcmp(z, "localtime")==0 ){
        computeJD(p);
        p->iJD += localtimeOffset(p, pCtx, &rc);
        clearYMD_HMS_TZ(p);

      }
      break;
    }
#endif
    case 'u': {
      /*
      **    unixepoch
      **
      ** Treat the current value of p->iJD as the number of
      ** seconds since 1970.  Convert to a real julian day number.
      */
      if( strcmp(z, "unixepoch")==0 && p->validJD ){
        p->iJD = (p->iJD + 43200)/86400 + 21086676*(i64)10000000;
        clearYMD_HMS_TZ(p);
        rc = 0;
      }
#ifndef SQLITE_OMIT_LOCALTIME
      else if( strcmp(z, "utc")==0 ){
        sqlite3_int64 c1;
        computeJD(p);
        c1 = localtimeOffset(p, pCtx, &rc);
        if( rc==SQLITE_OK ){
          p->iJD -= c1;
          clearYMD_HMS_TZ(p);
          p->iJD += c1 - localtimeOffset(p, pCtx, &rc);

        }
      }
#endif
      break;
    }
    case 'w': {
      /*
      **    weekday N

  }else{
    z = sqlite3_value_text(argv[0]);
    if( !z || parseDateOrTime(context, (char*)z, p) ){
      return 1;
    }
  }
  for(i=1; i<argc; i++){
    z = sqlite3_value_text(argv[i]);
    if( z==0 || parseModifier(context, (char*)z, p) ) return 1;

  }
  return 0;
}


/*
** The following routines implement the various date and time functions

      sz = va_arg(ap, int);
      ppNew = va_arg(ap, void**);
      pFree = va_arg(ap, void*);
      if( sz ) *ppNew = sqlite3ScratchMalloc(sz);
      sqlite3ScratchFree(pFree);
      break;
    }

    /*   sqlite3_test_control(SQLITE_TESTCTRL_LOCALTIME_FAULT, int onoff);
    **
    ** If parameter onoff is non-zero, configure the wrappers so that all
    ** subsequent calls to localtime() and variants fail. If onoff is zero,
    ** undo this setting.
    */
    case SQLITE_TESTCTRL_LOCALTIME_FAULT: {
      sqlite3GlobalConfig.bLocaltimeFault = va_arg(ap, int);
      break;
    }

  }
  va_end(ap);
#endif /* SQLITE_OMIT_BUILTIN_TEST */
  return rc;
}

#define SQLITE_TESTCTRL_ASSERT                  12
#define SQLITE_TESTCTRL_ALWAYS                  13
#define SQLITE_TESTCTRL_RESERVE                 14
#define SQLITE_TESTCTRL_OPTIMIZATIONS           15
#define SQLITE_TESTCTRL_ISKEYWORD               16
#define SQLITE_TESTCTRL_PGHDRSZ                 17
#define SQLITE_TESTCTRL_SCRATCHMALLOC           18
#define SQLITE_TESTCTRL_LOCALTIME_FAULT         19
#define SQLITE_TESTCTRL_LAST                    19

/*
** CAPI3REF: SQLite Runtime Status
**
** ^This interface is used to retrieve runtime status information
** about the performance of SQLite, and optionally to reset various
** highwater marks.  ^The first argument is an integer code for

  int isMutexInit;                  /* True after mutexes are initialized */
  int isMallocInit;                 /* True after malloc is initialized */
  int isPCacheInit;                 /* True after malloc is initialized */
  sqlite3_mutex *pInitMutex;        /* Mutex used by sqlite3_initialize() */
  int nRefInitMutex;                /* Number of users of pInitMutex */
  void (*xLog)(void*,int,const char*); /* Function for logging */
  void *pLogArg;                       /* First argument to xLog() */
  int bLocaltimeFault;              /* True to fail localtime() calls */
};

/*
** Context pointer passed down through the tree-walk.
*/
struct Walker {
  int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */

  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  rc = printExplainQueryPlan(pStmt);
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), 0);
  return TCL_OK;
}
#endif /* SQLITE_OMIT_EXPLAIN */

/*
** sqlite3_test_control VERB ARGS...
*/
static int test_test_control(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  struct Verb {
    const char *zName;
    int i;
  } aVerb[] = {
    { "SQLITE_TESTCTRL_LOCALTIME_FAULT", SQLITE_TESTCTRL_LOCALTIME_FAULT }, 
  };
  int iVerb;
  int iFlag;
  int rc;

  if( objc<2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "VERB ARGS...");
    return TCL_ERROR;
  }

  rc = Tcl_GetIndexFromObjStruct(
      interp, objv[1], aVerb, sizeof(aVerb[0]), "VERB", 0, &iVerb
  );
  if( rc!=TCL_OK ) return rc;

  iFlag = aVerb[iVerb].i;
  switch( iFlag ){
    case SQLITE_TESTCTRL_LOCALTIME_FAULT: {
      int val;
      if( objc!=3 ){
        Tcl_WrongNumArgs(interp, 2, objv, "ONOFF");
        return TCL_ERROR;
      }
      if( Tcl_GetBooleanFromObj(interp, objv[2], &val) ) return TCL_ERROR;
      sqlite3_test_control(SQLITE_TESTCTRL_LOCALTIME_FAULT, val);
      break;
    }
  }

  Tcl_ResetResult(interp);
  return TCL_OK;
}


/*
**      optimization_control DB OPT BOOLEAN
**
** Enable or disable query optimizations using the sqlite3_test_control()
** interface.  Disable if BOOLEAN is false and enable if BOOLEAN is true.
** OPT is the name of the optimization to be disabled.

#endif
     { "sqlite3_wal_checkpoint",   test_wal_checkpoint, 0  },
     { "sqlite3_wal_checkpoint_v2",test_wal_checkpoint_v2, 0  },
     { "test_sqlite3_log",         test_sqlite3_log, 0  },
#ifndef SQLITE_OMIT_EXPLAIN
     { "print_explain_query_plan", test_print_eqp, 0  },
#endif
     { "sqlite3_test_control", test_test_control },
  };
  static int bitmask_size = sizeof(Bitmask)*8;
  int i;
  extern int sqlite3_sync_count, sqlite3_fullsync_count;
  extern int sqlite3_opentemp_count;
  extern int sqlite3_like_count;
  extern int sqlite3_xferopt_count;

# 2011 June 21
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This file contains tests for SQLite. Specifically, it tests that SQLite
# does not crash and an error is returned if localhost() fails. This 
# is the problem reported by ticket bd484a090c.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

set testprefix tkt-bd484a090c


do_test 1.1 {
  lindex [catchsql { SELECT datetime('now', 'localtime') }] 0
} {0}
do_test 1.2 {
  lindex [catchsql { SELECT datetime('now', 'utc') }] 0
} {0}

sqlite3_test_control SQLITE_TESTCTRL_LOCALTIME_FAULT 1

do_test 2.1 {
  foreach {rc msg} [catchsql { SELECT datetime('now', 'localtime') }] {}
  set res [string match {error in localtime*()} $msg]
  list $rc $res
} {1 1}
do_test 2.2 {
  foreach {rc msg} [catchsql { SELECT datetime('now', 'utc') }] {}
  set res [string match {error in localtime*()} $msg]
  list $rc $res
} {1 1}

sqlite3_test_control SQLITE_TESTCTRL_LOCALTIME_FAULT 0

finish_test