/*
** datetime( TIMESTRING, MOD, MOD, ...)
**
** Return YYYY-MM-DD HH:MM:SS
*/
static void datetimeFunc(sqlite_func *context, int argc, const char **argv){
DateTime x;
if( isDate(argc, argv, &x)==0 ){
char zBuf[100];
computeYMD_HMS(&x);
sprintf(zBuf, "%04d-%02d-%02d %02d:%02d:%02d",x.Y, x.M, x.D, x.h, x.m,
(int)(x.s));
sqlite_set_result_string(context, zBuf, -1);
}
}
/*
** 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;
struct tm sLocal;
/* Initialize the contents of sLocal to avoid a compiler warning. */
memset(&sLocal, 0, sizeof(sLocal));
x = *p;
computeYMD_HMS(&x);
if( x.Y<1971 || x.Y>=2038 ){
/* EVIDENCE-OF: R-55269-29598 The localtime_r() C function normally only
** works for years between 1970 and 2037. For dates outside this range,
** SQLite attempts to map the year into an equivalent year within this
** range, do the calculation, then map the year back.
*/
x.Y = 2000;
x.M = 1;
x.D = 1;
x.h = 0;
x.m = 0;
x.s = 0.0;
} else {
int s = (int)(x.s + 0.5);
x.s = s;
}
x.tz = 0;
x.validJD = 0;
computeJD(&x);
t = (time_t)(x.iJD/1000 - 21086676*(i64)10000);
if( osLocaltime(&t, &sLocal) ){
sqlite3_result_error(pCtx, "local time unavailable", -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;
y.validYMD = 1;
y.validHMS = 1;
y.validJD = 0;
y.validTZ = 0;
computeJD(&y);
*pRc = SQLITE_OK;
return y.iJD - x.iJD;
}
/*
** datetime( TIMESTRING, MOD, MOD, ...)
**
** Return YYYY-MM-DD HH:MM:SS
*/
static void datetimeFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
DateTime x;
if( isDate(context, argc, argv, &x)==0 ){
char zBuf[100];
computeYMD_HMS(&x);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%04d-%02d-%02d %02d:%02d:%02d",
x.Y, x.M, x.D, x.h, x.m, (int)(x.s));
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
}
}
/*
** Compute the difference (in days) between localtime and UTC (a.k.a. GMT)
** for the time value p where p is in UTC.
*/
static double localtimeOffset(DateTime *p){
DateTime x, y;
time_t t;
struct tm *pTm;
x = *p;
computeYMD_HMS(&x);
if( x.Y<1971 || x.Y>=2038 ){
x.Y = 2000;
x.M = 1;
x.D = 1;
x.h = 0;
x.m = 0;
x.s = 0.0;
} else {
int s = x.s + 0.5;
x.s = s;
}
x.tz = 0;
x.validJD = 0;
computeJD(&x);
t = (x.rJD-2440587.5)*86400.0 + 0.5;
sqliteOsEnterMutex();
pTm = localtime(&t);
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;
sqliteOsLeaveMutex();
y.validYMD = 1;
y.validHMS = 1;
y.validJD = 0;
y.validTZ = 0;
computeJD(&y);
return y.rJD - x.rJD;
}
/*
** strftime( FORMAT, TIMESTRING, MOD, MOD, ...)
**
** Return a string described by FORMAT. Conversions as follows:
**
** %d day of month
** %f ** fractional seconds SS.SSS
** %H hour 00-24
** %j day of year 000-366
** %J ** julian day number
** %m month 01-12
** %M minute 00-59
** %s seconds since 1970-01-01
** %S seconds 00-59
** %w day of week 0-6 sunday==0
** %W week of year 00-53
** %Y year 0000-9999
** %% %
*/
static void strftimeFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
DateTime x;
u64 n;
size_t i,j;
char *z;
sqlite3 *db;
const char *zFmt;
char zBuf[100];
if( argc==0 ) return;
zFmt = (const char*)sqlite3_value_text(argv[0]);
if( zFmt==0 || isDate(context, argc-1, argv+1, &x) ) return;
db = sqlite3_context_db_handle(context);
for(i=0, n=1; zFmt[i]; i++, n++){
if( zFmt[i]=='%' ){
switch( zFmt[i+1] ){
case 'd':
case 'H':
case 'm':
case 'M':
case 'S':
case 'W':
n++;
/* fall thru */
case 'w':
case '%':
break;
case 'f':
n += 8;
break;
case 'j':
n += 3;
break;
case 'Y':
n += 8;
break;
case 's':
case 'J':
n += 50;
break;
default:
return; /* ERROR. return a NULL */
}
i++;
}
}
testcase( n==sizeof(zBuf)-1 );
testcase( n==sizeof(zBuf) );
testcase( n==(u64)db->aLimit[SQLITE_LIMIT_LENGTH]+1 );
testcase( n==(u64)db->aLimit[SQLITE_LIMIT_LENGTH] );
if( n<sizeof(zBuf) ){
z = zBuf;
}else if( n>(u64)db->aLimit[SQLITE_LIMIT_LENGTH] ){
sqlite3_result_error_toobig(context);
return;
}else{
z = sqlite3DbMallocRawNN(db, (int)n);
if( z==0 ){
sqlite3_result_error_nomem(context);
return;
}
}
computeJD(&x);
computeYMD_HMS(&x);
for(i=j=0; zFmt[i]; i++){
if( zFmt[i]!='%' ){
z[j++] = zFmt[i];
}else{
i++;
switch( zFmt[i] ){
case 'd': sqlite3_snprintf(3, &z[j],"%02d",x.D); j+=2; break;
case 'f': {
double s = x.s;
if( s>59.999 ) s = 59.999;
sqlite3_snprintf(7, &z[j],"%06.3f", s);
j += sqlite3Strlen30(&z[j]);
break;
}
case 'H': sqlite3_snprintf(3, &z[j],"%02d",x.h); j+=2; break;
case 'W': /* Fall thru */
case 'j': {
int nDay; /* Number of days since 1st day of year */
DateTime y = x;
y.validJD = 0;
y.M = 1;
y.D = 1;
computeJD(&y);
nDay = (int)((x.iJD-y.iJD+43200000)/86400000);
if( zFmt[i]=='W' ){
int wd; /* 0=Monday, 1=Tuesday, ... 6=Sunday */
wd = (int)(((x.iJD+43200000)/86400000)%7);
sqlite3_snprintf(3, &z[j],"%02d",(nDay+7-wd)/7);
j += 2;
}else{
sqlite3_snprintf(4, &z[j],"%03d",nDay+1);
j += 3;
}
break;
}
case 'J': {
sqlite3_snprintf(20, &z[j],"%.16g",x.iJD/86400000.0);
j+=sqlite3Strlen30(&z[j]);
break;
}
case 'm': sqlite3_snprintf(3, &z[j],"%02d",x.M); j+=2; break;
case 'M': sqlite3_snprintf(3, &z[j],"%02d",x.m); j+=2; break;
case 's': {
sqlite3_snprintf(30,&z[j],"%lld",
(i64)(x.iJD/1000 - 21086676*(i64)10000));
j += sqlite3Strlen30(&z[j]);
break;
}
case 'S': sqlite3_snprintf(3,&z[j],"%02d",(int)x.s); j+=2; break;
case 'w': {
z[j++] = (char)(((x.iJD+129600000)/86400000) % 7) + '0';
break;
}
case 'Y': {
sqlite3_snprintf(5,&z[j],"%04d",x.Y); j+=sqlite3Strlen30(&z[j]);
break;
}
default: z[j++] = '%'; break;
}
}
}
z[j] = 0;
sqlite3_result_text(context, z, -1,
z==zBuf ? SQLITE_TRANSIENT : SQLITE_DYNAMIC);
}
/*
** Process a modifier to a date-time stamp. The modifiers are
** as follows:
**
** NNN days
** NNN hours
** NNN minutes
** NNN.NNNN seconds
** NNN months
** NNN years
** start of month
** start of year
** 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 ){
if( p->tzSet==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);
}
p->tzSet = 1;
}else{
rc = SQLITE_OK;
}
}
#endif
break;
}
case 'w': {
/*
** weekday N
**
** Move the date to the same time on the next occurrence of
** weekday N where 0==Sunday, 1==Monday, and so forth. If the
** date is already on the appropriate weekday, this is a no-op.
*/
if( strncmp(z, "weekday ", 8)==0
&& sqlite3AtoF(&z[8], &r, sqlite3Strlen30(&z[8]), SQLITE_UTF8)
&& (n=(int)r)==r && n>=0 && r<7 ){
sqlite3_int64 Z;
computeYMD_HMS(p);
p->validTZ = 0;
p->validJD = 0;
computeJD(p);
Z = ((p->iJD + 129600000)/86400000) % 7;
if( Z>n ) Z -= 7;
p->iJD += (n - Z)*86400000;
clearYMD_HMS_TZ(p);
rc = 0;
}
break;
}
case 's': {
/*
** start of TTTTT
**
** Move the date backwards to the beginning of the current day,
** or month or year.
*/
if( strncmp(z, "start of ", 9)!=0 ) break;
z += 9;
computeYMD(p);
p->validHMS = 1;
p->h = p->m = 0;
p->s = 0.0;
p->validTZ = 0;
p->validJD = 0;
if( strcmp(z,"month")==0 ){
p->D = 1;
rc = 0;
}else if( strcmp(z,"year")==0 ){
computeYMD(p);
p->M = 1;
p->D = 1;
rc = 0;
}else if( strcmp(z,"day")==0 ){
rc = 0;
}
break;
}
case '+':
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': {
double rRounder;
for(n=1; z[n] && z[n]!=':' && !sqlite3Isspace(z[n]); n++){}
if( !sqlite3AtoF(z, &r, n, SQLITE_UTF8) ){
rc = 1;
break;
}
if( z[n]==':' ){
/* A modifier of the form (+|-)HH:MM:SS.FFF adds (or subtracts) the
** specified number of hours, minutes, seconds, and fractional seconds
** to the time. The ".FFF" may be omitted. The ":SS.FFF" may be
** omitted.
*/
const char *z2 = z;
DateTime tx;
sqlite3_int64 day;
if( !sqlite3Isdigit(*z2) ) z2++;
memset(&tx, 0, sizeof(tx));
if( parseHhMmSs(z2, &tx) ) break;
computeJD(&tx);
tx.iJD -= 43200000;
day = tx.iJD/86400000;
tx.iJD -= day*86400000;
if( z[0]=='-' ) tx.iJD = -tx.iJD;
computeJD(p);
clearYMD_HMS_TZ(p);
p->iJD += tx.iJD;
rc = 0;
break;
}
z += n;
while( sqlite3Isspace(*z) ) z++;
n = sqlite3Strlen30(z);
if( n>10 || n<3 ) break;
if( z[n-1]=='s' ){ z[n-1] = 0; n--; }
computeJD(p);
rc = 0;
rRounder = r<0 ? -0.5 : +0.5;
if( n==3 && strcmp(z,"day")==0 ){
p->iJD += (sqlite3_int64)(r*86400000.0 + rRounder);
}else if( n==4 && strcmp(z,"hour")==0 ){
p->iJD += (sqlite3_int64)(r*(86400000.0/24.0) + rRounder);
}else if( n==6 && strcmp(z,"minute")==0 ){
p->iJD += (sqlite3_int64)(r*(86400000.0/(24.0*60.0)) + rRounder);
}else if( n==6 && strcmp(z,"second")==0 ){
p->iJD += (sqlite3_int64)(r*(86400000.0/(24.0*60.0*60.0)) + rRounder);
}else if( n==5 && strcmp(z,"month")==0 ){
int x, y;
computeYMD_HMS(p);
p->M += (int)r;
x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
p->Y += x;
p->M -= x*12;
p->validJD = 0;
computeJD(p);
y = (int)r;
if( y!=r ){
p->iJD += (sqlite3_int64)((r - y)*30.0*86400000.0 + rRounder);
}
}else if( n==4 && strcmp(z,"year")==0 ){
int y = (int)r;
computeYMD_HMS(p);
p->Y += y;
p->validJD = 0;
computeJD(p);
if( y!=r ){
p->iJD += (sqlite3_int64)((r - y)*365.0*86400000.0 + rRounder);
}
}else{
rc = 1;
}
clearYMD_HMS_TZ(p);
break;
}
default: {
break;
}
}
return rc;
}
/*
** strftime( FORMAT, TIMESTRING, MOD, MOD, ...)
**
** Return a string described by FORMAT. Conversions as follows:
**
** %d day of month
** %f ** fractional seconds SS.SSS
** %H hour 00-24
** %j day of year 000-366
** %J ** Julian day number
** %m month 01-12
** %M minute 00-59
** %s seconds since 1970-01-01
** %S seconds 00-59
** %w day of week 0-6 sunday==0
** %W week of year 00-53
** %Y year 0000-9999
** %% %
*/
static void strftimeFunc(sqlite_func *context, int argc, const char **argv){
DateTime x;
int n, i, j;
char *z;
const char *zFmt = argv[0];
char zBuf[100];
if( argv[0]==0 || isDate(argc-1, argv+1, &x) ) return;
for(i=0, n=1; zFmt[i]; i++, n++){
if( zFmt[i]=='%' ){
switch( zFmt[i+1] ){
case 'd':
case 'H':
case 'm':
case 'M':
case 'S':
case 'W':
n++;
/* fall thru */
case 'w':
case '%':
break;
case 'f':
n += 8;
break;
case 'j':
n += 3;
break;
case 'Y':
n += 8;
break;
case 's':
case 'J':
n += 50;
break;
default:
return; /* ERROR. return a NULL */
}
i++;
}
}
if( n<sizeof(zBuf) ){
z = zBuf;
}else{
z = sqliteMalloc( n );
if( z==0 ) return;
}
computeJD(&x);
computeYMD_HMS(&x);
for(i=j=0; zFmt[i]; i++){
if( zFmt[i]!='%' ){
z[j++] = zFmt[i];
}else{
i++;
switch( zFmt[i] ){
case 'd': sprintf(&z[j],"%02d",x.D); j+=2; break;
case 'f': {
int s = x.s;
int ms = (x.s - s)*1000.0;
sprintf(&z[j],"%02d.%03d",s,ms);
j += strlen(&z[j]);
break;
}
case 'H': sprintf(&z[j],"%02d",x.h); j+=2; break;
case 'W': /* Fall thru */
case 'j': {
int n;
DateTime y = x;
y.validJD = 0;
y.M = 1;
y.D = 1;
computeJD(&y);
n = x.rJD - y.rJD + 1;
if( zFmt[i]=='W' ){
sprintf(&z[j],"%02d",(n+6)/7);
j += 2;
}else{
sprintf(&z[j],"%03d",n);
j += 3;
}
break;
}
case 'J': sprintf(&z[j],"%.16g",x.rJD); j+=strlen(&z[j]); break;
case 'm': sprintf(&z[j],"%02d",x.M); j+=2; break;
case 'M': sprintf(&z[j],"%02d",x.m); j+=2; break;
case 's': {
sprintf(&z[j],"%d",(int)((x.rJD-2440587.5)*86400.0 + 0.5));
j += strlen(&z[j]);
break;
}
case 'S': sprintf(&z[j],"%02d",(int)(x.s+0.5)); j+=2; break;
case 'w': z[j++] = (((int)(x.rJD+1.5)) % 7) + '0'; break;
case 'Y': sprintf(&z[j],"%04d",x.Y); j+=strlen(&z[j]); break;
case '%': z[j++] = '%'; break;
}
}
}
z[j] = 0;
sqlite_set_result_string(context, z, -1);
if( z!=zBuf ){
sqliteFree(z);
}
}
/*
** Process a modifier to a date-time stamp. The modifiers are
** as follows:
**
** NNN days
** NNN hours
** NNN minutes
** NNN.NNNN seconds
** NNN months
** NNN years
** start of month
** start of year
** start of week
** start of day
** weekday N
** unixepoch
** localtime
** utc
**
** Return 0 on success and 1 if there is any kind of error.
*/
static int parseModifier(const char *zMod, DateTime *p){
int rc = 1;
int n;
double r;
char *z, zBuf[30];
z = zBuf;
for(n=0; n<sizeof(zBuf)-1 && zMod[n]; n++){
z[n] = tolower(zMod[n]);
}
z[n] = 0;
switch( z[0] ){
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->rJD += localtimeOffset(p);
clearYMD_HMS_TZ(p);
rc = 0;
}
break;
}
case 'u': {
/*
** unixepoch
**
** Treat the current value of p->rJD as the number of
** seconds since 1970. Convert to a real julian day number.
*/
if( strcmp(z, "unixepoch")==0 && p->validJD ){
p->rJD = p->rJD/86400.0 + 2440587.5;
clearYMD_HMS_TZ(p);
rc = 0;
}else if( strcmp(z, "utc")==0 ){
double c1;
computeJD(p);
c1 = localtimeOffset(p);
p->rJD -= c1;
clearYMD_HMS_TZ(p);
p->rJD += c1 - localtimeOffset(p);
rc = 0;
}
break;
}
case 'w': {
/*
** weekday N
**
** Move the date to the same time on the next occurrance of
** weekday N where 0==Sunday, 1==Monday, and so forth. If the
** date is already on the appropriate weekday, this is a no-op.
*/
if( strncmp(z, "weekday ", 8)==0 && getValue(&z[8],&r)>0
&& (n=r)==r && n>=0 && r<7 ){
int Z;
computeYMD_HMS(p);
p->validTZ = 0;
p->validJD = 0;
computeJD(p);
Z = p->rJD + 1.5;
Z %= 7;
if( Z>n ) Z -= 7;
p->rJD += n - Z;
clearYMD_HMS_TZ(p);
rc = 0;
}
break;
}
case 's': {
/*
** start of TTTTT
**
** Move the date backwards to the beginning of the current day,
** or month or year.
*/
if( strncmp(z, "start of ", 9)!=0 ) break;
z += 9;
computeYMD(p);
p->validHMS = 1;
p->h = p->m = 0;
p->s = 0.0;
p->validTZ = 0;
p->validJD = 0;
if( strcmp(z,"month")==0 ){
p->D = 1;
rc = 0;
}else if( strcmp(z,"year")==0 ){
computeYMD(p);
p->M = 1;
p->D = 1;
rc = 0;
}else if( strcmp(z,"day")==0 ){
rc = 0;
}
break;
}
case '+':
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': {
n = getValue(z, &r);
if( n<=0 ) break;
z += n;
while( isspace(z[0]) ) z++;
n = strlen(z);
if( n>10 || n<3 ) break;
if( z[n-1]=='s' ){ z[n-1] = 0; n--; }
computeJD(p);
rc = 0;
if( n==3 && strcmp(z,"day")==0 ){
p->rJD += r;
}else if( n==4 && strcmp(z,"hour")==0 ){
p->rJD += r/24.0;
}else if( n==6 && strcmp(z,"minute")==0 ){
p->rJD += r/(24.0*60.0);
}else if( n==6 && strcmp(z,"second")==0 ){
p->rJD += r/(24.0*60.0*60.0);
}else if( n==5 && strcmp(z,"month")==0 ){
int x, y;
computeYMD_HMS(p);
p->M += r;
x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
p->Y += x;
p->M -= x*12;
p->validJD = 0;
computeJD(p);
y = r;
if( y!=r ){
p->rJD += (r - y)*30.0;
}
}else if( n==4 && strcmp(z,"year")==0 ){
computeYMD_HMS(p);
p->Y += r;
p->validJD = 0;
computeJD(p);
}else{
rc = 1;
}
clearYMD_HMS_TZ(p);
break;
}
default: {
break;
}
}
return rc;
}
