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util.c
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util.c
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** 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.
**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
*/
#include "sqliteInt.h"
#include <stdarg.h>
#ifndef SQLITE_OMIT_FLOATING_POINT
#include <math.h>
#endif
/*
** Calls to sqlite3FaultSim() are used to simulate a failure during testing,
** or to bypass normal error detection during testing in order to let
** execute proceed further downstream.
**
** In deployment, sqlite3FaultSim() *always* return SQLITE_OK (0). The
** sqlite3FaultSim() function only returns non-zero during testing.
**
** During testing, if the test harness has set a fault-sim callback using
** a call to sqlite3_test_control(SQLITE_TESTCTRL_FAULT_INSTALL), then
** each call to sqlite3FaultSim() is relayed to that application-supplied
** callback and the integer return value form the application-supplied
** callback is returned by sqlite3FaultSim().
**
** The integer argument to sqlite3FaultSim() is a code to identify which
** sqlite3FaultSim() instance is being invoked. Each call to sqlite3FaultSim()
** should have a unique code. To prevent legacy testing applications from
** breaking, the codes should not be changed or reused.
*/
#ifndef SQLITE_UNTESTABLE
int sqlite3FaultSim(int iTest){
int (*xCallback)(int) = sqlite3GlobalConfig.xTestCallback;
return xCallback ? xCallback(iTest) : SQLITE_OK;
}
#endif
#ifndef SQLITE_OMIT_FLOATING_POINT
/*
** Return true if the floating point value is Not a Number (NaN).
**
** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN.
** Otherwise, we have our own implementation that works on most systems.
*/
int sqlite3IsNaN(double x){
int rc; /* The value return */
#if !SQLITE_HAVE_ISNAN && !HAVE_ISNAN
u64 y;
memcpy(&y,&x,sizeof(y));
rc = IsNaN(y);
#else
rc = isnan(x);
#endif /* HAVE_ISNAN */
testcase( rc );
return rc;
}
#endif /* SQLITE_OMIT_FLOATING_POINT */
/*
** Compute a string length that is limited to what can be stored in
** lower 30 bits of a 32-bit signed integer.
**
** The value returned will never be negative. Nor will it ever be greater
** than the actual length of the string. For very long strings (greater
** than 1GiB) the value returned might be less than the true string length.
*/
int sqlite3Strlen30(const char *z){
if( z==0 ) return 0;
return 0x3fffffff & (int)strlen(z);
}
/*
** Return the declared type of a column. Or return zDflt if the column
** has no declared type.
**
** The column type is an extra string stored after the zero-terminator on
** the column name if and only if the COLFLAG_HASTYPE flag is set.
*/
char *sqlite3ColumnType(Column *pCol, char *zDflt){
if( pCol->colFlags & COLFLAG_HASTYPE ){
return pCol->zCnName + strlen(pCol->zCnName) + 1;
}else if( pCol->eCType ){
assert( pCol->eCType<=SQLITE_N_STDTYPE );
return (char*)sqlite3StdType[pCol->eCType-1];
}else{
return zDflt;
}
}
/*
** Helper function for sqlite3Error() - called rarely. Broken out into
** a separate routine to avoid unnecessary register saves on entry to
** sqlite3Error().
*/
static SQLITE_NOINLINE void sqlite3ErrorFinish(sqlite3 *db, int err_code){
if( db->pErr ) sqlite3ValueSetNull(db->pErr);
sqlite3SystemError(db, err_code);
}
/*
** Set the current error code to err_code and clear any prior error message.
** Also set iSysErrno (by calling sqlite3System) if the err_code indicates
** that would be appropriate.
*/
void sqlite3Error(sqlite3 *db, int err_code){
assert( db!=0 );
db->errCode = err_code;
if( err_code || db->pErr ){
sqlite3ErrorFinish(db, err_code);
}else{
db->errByteOffset = -1;
}
}
/*
** The equivalent of sqlite3Error(db, SQLITE_OK). Clear the error state
** and error message.
*/
void sqlite3ErrorClear(sqlite3 *db){
assert( db!=0 );
db->errCode = SQLITE_OK;
db->errByteOffset = -1;
if( db->pErr ) sqlite3ValueSetNull(db->pErr);
}
/*
** Load the sqlite3.iSysErrno field if that is an appropriate thing
** to do based on the SQLite error code in rc.
*/
void sqlite3SystemError(sqlite3 *db, int rc){
if( rc==SQLITE_IOERR_NOMEM ) return;
#ifdef SQLITE_USE_SEH
if( rc==SQLITE_IOERR_IN_PAGE ){
int ii;
int iErr;
sqlite3BtreeEnterAll(db);
for(ii=0; ii<db->nDb; ii++){
if( db->aDb[ii].pBt ){
iErr = sqlite3PagerWalSystemErrno(sqlite3BtreePager(db->aDb[ii].pBt));
if( iErr ){
db->iSysErrno = iErr;
}
}
}
sqlite3BtreeLeaveAll(db);
return;
}
#endif
rc &= 0xff;
if( rc==SQLITE_CANTOPEN || rc==SQLITE_IOERR ){
db->iSysErrno = sqlite3OsGetLastError(db->pVfs);
}
}
/*
** Set the most recent error code and error string for the sqlite
** handle "db". The error code is set to "err_code".
**
** If it is not NULL, string zFormat specifies the format of the
** error string. zFormat and any string tokens that follow it are
** assumed to be encoded in UTF-8.
**
** To clear the most recent error for sqlite handle "db", sqlite3Error
** should be called with err_code set to SQLITE_OK and zFormat set
** to NULL.
*/
void sqlite3ErrorWithMsg(sqlite3 *db, int err_code, const char *zFormat, ...){
assert( db!=0 );
db->errCode = err_code;
sqlite3SystemError(db, err_code);
if( zFormat==0 ){
sqlite3Error(db, err_code);
}else if( db->pErr || (db->pErr = sqlite3ValueNew(db))!=0 ){
char *z;
va_list ap;
va_start(ap, zFormat);
z = sqlite3VMPrintf(db, zFormat, ap);
va_end(ap);
sqlite3ValueSetStr(db->pErr, -1, z, SQLITE_UTF8, SQLITE_DYNAMIC);
}
}
/*
** Check for interrupts and invoke progress callback.
*/
void sqlite3ProgressCheck(Parse *p){
sqlite3 *db = p->db;
if( AtomicLoad(&db->u1.isInterrupted) ){
p->nErr++;
p->rc = SQLITE_INTERRUPT;
}
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
if( db->xProgress ){
if( p->rc==SQLITE_INTERRUPT ){
p->nProgressSteps = 0;
}else if( (++p->nProgressSteps)>=db->nProgressOps ){
if( db->xProgress(db->pProgressArg) ){
p->nErr++;
p->rc = SQLITE_INTERRUPT;
}
p->nProgressSteps = 0;
}
}
#endif
}
/*
** Add an error message to pParse->zErrMsg and increment pParse->nErr.
**
** This function should be used to report any error that occurs while
** compiling an SQL statement (i.e. within sqlite3_prepare()). The
** last thing the sqlite3_prepare() function does is copy the error
** stored by this function into the database handle using sqlite3Error().
** Functions sqlite3Error() or sqlite3ErrorWithMsg() should be used
** during statement execution (sqlite3_step() etc.).
*/
void sqlite3ErrorMsg(Parse *pParse, const char *zFormat, ...){
char *zMsg;
va_list ap;
sqlite3 *db = pParse->db;
assert( db!=0 );
assert( db->pParse==pParse || db->pParse->pToplevel==pParse );
db->errByteOffset = -2;
va_start(ap, zFormat);
zMsg = sqlite3VMPrintf(db, zFormat, ap);
va_end(ap);
if( db->errByteOffset<-1 ) db->errByteOffset = -1;
if( db->suppressErr ){
sqlite3DbFree(db, zMsg);
if( db->mallocFailed ){
pParse->nErr++;
pParse->rc = SQLITE_NOMEM;
}
}else{
pParse->nErr++;
sqlite3DbFree(db, pParse->zErrMsg);
pParse->zErrMsg = zMsg;
pParse->rc = SQLITE_ERROR;
pParse->pWith = 0;
}
}
/*
** If database connection db is currently parsing SQL, then transfer
** error code errCode to that parser if the parser has not already
** encountered some other kind of error.
*/
int sqlite3ErrorToParser(sqlite3 *db, int errCode){
Parse *pParse;
if( db==0 || (pParse = db->pParse)==0 ) return errCode;
pParse->rc = errCode;
pParse->nErr++;
return errCode;
}
/*
** Convert an SQL-style quoted string into a normal string by removing
** the quote characters. The conversion is done in-place. If the
** input does not begin with a quote character, then this routine
** is a no-op.
**
** The input string must be zero-terminated. A new zero-terminator
** is added to the dequoted string.
**
** The return value is -1 if no dequoting occurs or the length of the
** dequoted string, exclusive of the zero terminator, if dequoting does
** occur.
**
** 2002-02-14: This routine is extended to remove MS-Access style
** brackets from around identifiers. For example: "[a-b-c]" becomes
** "a-b-c".
*/
void sqlite3Dequote(char *z){
char quote;
int i, j;
if( z==0 ) return;
quote = z[0];
if( !sqlite3Isquote(quote) ) return;
if( quote=='[' ) quote = ']';
for(i=1, j=0;; i++){
assert( z[i] );
if( z[i]==quote ){
if( z[i+1]==quote ){
z[j++] = quote;
i++;
}else{
break;
}
}else{
z[j++] = z[i];
}
}
z[j] = 0;
}
void sqlite3DequoteExpr(Expr *p){
assert( !ExprHasProperty(p, EP_IntValue) );
assert( sqlite3Isquote(p->u.zToken[0]) );
p->flags |= p->u.zToken[0]=='"' ? EP_Quoted|EP_DblQuoted : EP_Quoted;
sqlite3Dequote(p->u.zToken);
}
/*
** If the input token p is quoted, try to adjust the token to remove
** the quotes. This is not always possible:
**
** "abc" -> abc
** "ab""cd" -> (not possible because of the interior "")
**
** Remove the quotes if possible. This is a optimization. The overall
** system should still return the correct answer even if this routine
** is always a no-op.
*/
void sqlite3DequoteToken(Token *p){
unsigned int i;
if( p->n<2 ) return;
if( !sqlite3Isquote(p->z[0]) ) return;
for(i=1; i<p->n-1; i++){
if( sqlite3Isquote(p->z[i]) ) return;
}
p->n -= 2;
p->z++;
}
/*
** Generate a Token object from a string
*/
void sqlite3TokenInit(Token *p, char *z){
p->z = z;
p->n = sqlite3Strlen30(z);
}
/* Convenient short-hand */
#define UpperToLower sqlite3UpperToLower
/*
** Some systems have stricmp(). Others have strcasecmp(). Because
** there is no consistency, we will define our own.
**
** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
** sqlite3_strnicmp() APIs allow applications and extensions to compare
** the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of "case
** independence" that SQLite uses internally when comparing identifiers.
*/
int sqlite3_stricmp(const char *zLeft, const char *zRight){
if( zLeft==0 ){
return zRight ? -1 : 0;
}else if( zRight==0 ){
return 1;
}
return sqlite3StrICmp(zLeft, zRight);
}
int sqlite3StrICmp(const char *zLeft, const char *zRight){
unsigned char *a, *b;
int c, x;
a = (unsigned char *)zLeft;
b = (unsigned char *)zRight;
for(;;){
c = *a;
x = *b;
if( c==x ){
if( c==0 ) break;
}else{
c = (int)UpperToLower[c] - (int)UpperToLower[x];
if( c ) break;
}
a++;
b++;
}
return c;
}
int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
register unsigned char *a, *b;
if( zLeft==0 ){
return zRight ? -1 : 0;
}else if( zRight==0 ){
return 1;
}
a = (unsigned char *)zLeft;
b = (unsigned char *)zRight;
while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}
/*
** Compute an 8-bit hash on a string that is insensitive to case differences
*/
u8 sqlite3StrIHash(const char *z){
u8 h = 0;
if( z==0 ) return 0;
while( z[0] ){
h += UpperToLower[(unsigned char)z[0]];
z++;
}
return h;
}
/* Double-Double multiplication. (x[0],x[1]) *= (y,yy)
**
** Reference:
** T. J. Dekker, "A Floating-Point Technique for Extending the
** Available Precision". 1971-07-26.
*/
static void dekkerMul2(volatile double *x, double y, double yy){
/*
** The "volatile" keywords on parameter x[] and on local variables
** below are needed force intermediate results to be truncated to
** binary64 rather than be carried around in an extended-precision
** format. The truncation is necessary for the Dekker algorithm to
** work. Intel x86 floating point might omit the truncation without
** the use of volatile.
*/
volatile double tx, ty, p, q, c, cc;
double hx, hy;
u64 m;
memcpy(&m, (void*)&x[0], 8);
m &= 0xfffffffffc000000LL;
memcpy(&hx, &m, 8);
tx = x[0] - hx;
memcpy(&m, &y, 8);
m &= 0xfffffffffc000000LL;
memcpy(&hy, &m, 8);
ty = y - hy;
p = hx*hy;
q = hx*ty + tx*hy;
c = p+q;
cc = p - c + q + tx*ty;
cc = x[0]*yy + x[1]*y + cc;
x[0] = c + cc;
x[1] = c - x[0];
x[1] += cc;
}
/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
** uses the encoding enc. The string is not necessarily zero-terminated.
**
** Return TRUE if the result is a valid real number (or integer) and FALSE
** if the string is empty or contains extraneous text. More specifically
** return
** 1 => The input string is a pure integer
** 2 or more => The input has a decimal point or eNNN clause
** 0 or less => The input string is not a valid number
** -1 => Not a valid number, but has a valid prefix which
** includes a decimal point and/or an eNNN clause
**
** Valid numbers are in one of these formats:
**
** [+-]digits[E[+-]digits]
** [+-]digits.[digits][E[+-]digits]
** [+-].digits[E[+-]digits]
**
** Leading and trailing whitespace is ignored for the purpose of determining
** validity.
**
** If some prefix of the input string is a valid number, this routine
** returns FALSE but it still converts the prefix and writes the result
** into *pResult.
*/
#if defined(_MSC_VER)
#pragma warning(disable : 4756)
#endif
int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
#ifndef SQLITE_OMIT_FLOATING_POINT
int incr;
const char *zEnd;
/* sign * significand * (10 ^ (esign * exponent)) */
int sign = 1; /* sign of significand */
u64 s = 0; /* significand */
int d = 0; /* adjust exponent for shifting decimal point */
int esign = 1; /* sign of exponent */
int e = 0; /* exponent */
int eValid = 1; /* True exponent is either not used or is well-formed */
int nDigit = 0; /* Number of digits processed */
int eType = 1; /* 1: pure integer, 2+: fractional -1 or less: bad UTF16 */
assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
*pResult = 0.0; /* Default return value, in case of an error */
if( length==0 ) return 0;
if( enc==SQLITE_UTF8 ){
incr = 1;
zEnd = z + length;
}else{
int i;
incr = 2;
length &= ~1;
assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
testcase( enc==SQLITE_UTF16LE );
testcase( enc==SQLITE_UTF16BE );
for(i=3-enc; i<length && z[i]==0; i+=2){}
if( i<length ) eType = -100;
zEnd = &z[i^1];
z += (enc&1);
}
/* skip leading spaces */
while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
if( z>=zEnd ) return 0;
/* get sign of significand */
if( *z=='-' ){
sign = -1;
z+=incr;
}else if( *z=='+' ){
z+=incr;
}
/* copy max significant digits to significand */
while( z<zEnd && sqlite3Isdigit(*z) ){
s = s*10 + (*z - '0');
z+=incr; nDigit++;
if( s>=((LARGEST_UINT64-9)/10) ){
/* skip non-significant significand digits
** (increase exponent by d to shift decimal left) */
while( z<zEnd && sqlite3Isdigit(*z) ){ z+=incr; d++; }
}
}
if( z>=zEnd ) goto do_atof_calc;
/* if decimal point is present */
if( *z=='.' ){
z+=incr;
eType++;
/* copy digits from after decimal to significand
** (decrease exponent by d to shift decimal right) */
while( z<zEnd && sqlite3Isdigit(*z) ){
if( s<((LARGEST_UINT64-9)/10) ){
s = s*10 + (*z - '0');
d--;
nDigit++;
}
z+=incr;
}
}
if( z>=zEnd ) goto do_atof_calc;
/* if exponent is present */
if( *z=='e' || *z=='E' ){
z+=incr;
eValid = 0;
eType++;
/* This branch is needed to avoid a (harmless) buffer overread. The
** special comment alerts the mutation tester that the correct answer
** is obtained even if the branch is omitted */
if( z>=zEnd ) goto do_atof_calc; /*PREVENTS-HARMLESS-OVERREAD*/
/* get sign of exponent */
if( *z=='-' ){
esign = -1;
z+=incr;
}else if( *z=='+' ){
z+=incr;
}
/* copy digits to exponent */
while( z<zEnd && sqlite3Isdigit(*z) ){
e = e<10000 ? (e*10 + (*z - '0')) : 10000;
z+=incr;
eValid = 1;
}
}
/* skip trailing spaces */
while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
do_atof_calc:
/* Zero is a special case */
if( s==0 ){
*pResult = sign<0 ? -0.0 : +0.0;
goto atof_return;
}
/* adjust exponent by d, and update sign */
e = (e*esign) + d;
/* Try to adjust the exponent to make it smaller */
while( e>0 && s<(LARGEST_UINT64/10) ){
s *= 10;
e--;
}
while( e<0 && (s%10)==0 ){
s /= 10;
e++;
}
if( e==0 ){
*pResult = s;
}else if( sqlite3Config.bUseLongDouble ){
LONGDOUBLE_TYPE r = (LONGDOUBLE_TYPE)s;
if( e>0 ){
while( e>=100 ){ e-=100; r *= 1.0e+100L; }
while( e>=10 ){ e-=10; r *= 1.0e+10L; }
while( e>=1 ){ e-=1; r *= 1.0e+01L; }
}else{
while( e<=-100 ){ e+=100; r *= 1.0e-100L; }
while( e<=-10 ){ e+=10; r *= 1.0e-10L; }
while( e<=-1 ){ e+=1; r *= 1.0e-01L; }
}
assert( r>=0.0 );
if( r>+1.7976931348623157081452742373e+308L ){
#ifdef INFINITY
*pResult = +INFINITY;
#else
*pResult = 1.0e308*10.0;
#endif
}else{
*pResult = (double)r;
}
}else{
double rr[2];
u64 s2;
rr[0] = (double)s;
s2 = (u64)rr[0];
rr[1] = s>=s2 ? (double)(s - s2) : -(double)(s2 - s);
if( e>0 ){
while( e>=100 ){
e -= 100;
dekkerMul2(rr, 1.0e+100, -1.5902891109759918046e+83);
}
while( e>=10 ){
e -= 10;
dekkerMul2(rr, 1.0e+10, 0.0);
}
while( e>=1 ){
e -= 1;
dekkerMul2(rr, 1.0e+01, 0.0);
}
}else{
while( e<=-100 ){
e += 100;
dekkerMul2(rr, 1.0e-100, -1.99918998026028836196e-117);
}
while( e<=-10 ){
e += 10;
dekkerMul2(rr, 1.0e-10, -3.6432197315497741579e-27);
}
while( e<=-1 ){
e += 1;
dekkerMul2(rr, 1.0e-01, -5.5511151231257827021e-18);
}
}
*pResult = rr[0]+rr[1];
if( sqlite3IsNaN(*pResult) ) *pResult = 1e300*1e300;
}
if( sign<0 ) *pResult = -*pResult;
assert( !sqlite3IsNaN(*pResult) );
atof_return:
/* return true if number and no extra non-whitespace characters after */
if( z==zEnd && nDigit>0 && eValid && eType>0 ){
return eType;
}else if( eType>=2 && (eType==3 || eValid) && nDigit>0 ){
return -1;
}else{
return 0;
}
#else
return !sqlite3Atoi64(z, pResult, length, enc);
#endif /* SQLITE_OMIT_FLOATING_POINT */
}
#if defined(_MSC_VER)
#pragma warning(default : 4756)
#endif
/*
** Render an signed 64-bit integer as text. Store the result in zOut[] and
** return the length of the string that was stored, in bytes. The value
** returned does not include the zero terminator at the end of the output
** string.
**
** The caller must ensure that zOut[] is at least 21 bytes in size.
*/
int sqlite3Int64ToText(i64 v, char *zOut){
int i;
u64 x;
char zTemp[22];
if( v<0 ){
x = (v==SMALLEST_INT64) ? ((u64)1)<<63 : (u64)-v;
}else{
x = v;
}
i = sizeof(zTemp)-2;
zTemp[sizeof(zTemp)-1] = 0;
while( 1 /*exit-by-break*/ ){
zTemp[i] = (x%10) + '0';
x = x/10;
if( x==0 ) break;
i--;
};
if( v<0 ) zTemp[--i] = '-';
memcpy(zOut, &zTemp[i], sizeof(zTemp)-i);
return sizeof(zTemp)-1-i;
}
/*
** Compare the 19-character string zNum against the text representation
** value 2^63: 9223372036854775808. Return negative, zero, or positive
** if zNum is less than, equal to, or greater than the string.
** Note that zNum must contain exactly 19 characters.
**
** Unlike memcmp() this routine is guaranteed to return the difference
** in the values of the last digit if the only difference is in the
** last digit. So, for example,
**
** compare2pow63("9223372036854775800", 1)
**
** will return -8.
*/
static int compare2pow63(const char *zNum, int incr){
int c = 0;
int i;
/* 012345678901234567 */
const char *pow63 = "922337203685477580";
for(i=0; c==0 && i<18; i++){
c = (zNum[i*incr]-pow63[i])*10;
}
if( c==0 ){
c = zNum[18*incr] - '8';
testcase( c==(-1) );
testcase( c==0 );
testcase( c==(+1) );
}
return c;
}
/*
** Convert zNum to a 64-bit signed integer. zNum must be decimal. This
** routine does *not* accept hexadecimal notation.
**
** Returns:
**
** -1 Not even a prefix of the input text looks like an integer
** 0 Successful transformation. Fits in a 64-bit signed integer.
** 1 Excess non-space text after the integer value
** 2 Integer too large for a 64-bit signed integer or is malformed
** 3 Special case of 9223372036854775808
**
** length is the number of bytes in the string (bytes, not characters).
** The string is not necessarily zero-terminated. The encoding is
** given by enc.
*/
int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
int incr;
u64 u = 0;
int neg = 0; /* assume positive */
int i;
int c = 0;
int nonNum = 0; /* True if input contains UTF16 with high byte non-zero */
int rc; /* Baseline return code */
const char *zStart;
const char *zEnd = zNum + length;
assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
if( enc==SQLITE_UTF8 ){
incr = 1;
}else{
incr = 2;
length &= ~1;
assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
for(i=3-enc; i<length && zNum[i]==0; i+=2){}
nonNum = i<length;
zEnd = &zNum[i^1];
zNum += (enc&1);
}
while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
if( zNum<zEnd ){
if( *zNum=='-' ){
neg = 1;
zNum+=incr;
}else if( *zNum=='+' ){
zNum+=incr;
}
}
zStart = zNum;
while( zNum<zEnd && zNum[0]=='0' ){ zNum+=incr; } /* Skip leading zeros. */
for(i=0; &zNum[i]<zEnd && (c=zNum[i])>='0' && c<='9'; i+=incr){
u = u*10 + c - '0';
}
testcase( i==18*incr );
testcase( i==19*incr );
testcase( i==20*incr );
if( u>LARGEST_INT64 ){
/* This test and assignment is needed only to suppress UB warnings
** from clang and -fsanitize=undefined. This test and assignment make
** the code a little larger and slower, and no harm comes from omitting
** them, but we must appease the undefined-behavior pharisees. */
*pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
}else if( neg ){
*pNum = -(i64)u;
}else{
*pNum = (i64)u;
}
rc = 0;
if( i==0 && zStart==zNum ){ /* No digits */
rc = -1;
}else if( nonNum ){ /* UTF16 with high-order bytes non-zero */
rc = 1;
}else if( &zNum[i]<zEnd ){ /* Extra bytes at the end */
int jj = i;
do{
if( !sqlite3Isspace(zNum[jj]) ){
rc = 1; /* Extra non-space text after the integer */
break;
}
jj += incr;
}while( &zNum[jj]<zEnd );
}
if( i<19*incr ){
/* Less than 19 digits, so we know that it fits in 64 bits */
assert( u<=LARGEST_INT64 );
return rc;
}else{
/* zNum is a 19-digit numbers. Compare it against 9223372036854775808. */
c = i>19*incr ? 1 : compare2pow63(zNum, incr);
if( c<0 ){
/* zNum is less than 9223372036854775808 so it fits */
assert( u<=LARGEST_INT64 );
return rc;
}else{
*pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
if( c>0 ){
/* zNum is greater than 9223372036854775808 so it overflows */
return 2;
}else{
/* zNum is exactly 9223372036854775808. Fits if negative. The
** special case 2 overflow if positive */
assert( u-1==LARGEST_INT64 );
return neg ? rc : 3;
}
}
}
}
/*
** Transform a UTF-8 integer literal, in either decimal or hexadecimal,
** into a 64-bit signed integer. This routine accepts hexadecimal literals,
** whereas sqlite3Atoi64() does not.
**
** Returns:
**
** 0 Successful transformation. Fits in a 64-bit signed integer.
** 1 Excess text after the integer value
** 2 Integer too large for a 64-bit signed integer or is malformed
** 3 Special case of 9223372036854775808
*/
int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
#ifndef SQLITE_OMIT_HEX_INTEGER
if( z[0]=='0'
&& (z[1]=='x' || z[1]=='X')
){
u64 u = 0;
int i, k;
for(i=2; z[i]=='0'; i++){}
for(k=i; sqlite3Isxdigit(z[k]); k++){
u = u*16 + sqlite3HexToInt(z[k]);
}
memcpy(pOut, &u, 8);
if( k-i>16 ) return 2;
if( z[k]!=0 ) return 1;
return 0;
}else
#endif /* SQLITE_OMIT_HEX_INTEGER */
{
int n = (int)(0x3fffffff&strspn(z,"+- \n\t0123456789"));
if( z[n] ) n++;
return sqlite3Atoi64(z, pOut, n, SQLITE_UTF8);
}
}
/*
** If zNum represents an integer that will fit in 32-bits, then set
** *pValue to that integer and return true. Otherwise return false.
**
** This routine accepts both decimal and hexadecimal notation for integers.
**
** Any non-numeric characters that following zNum are ignored.
** This is different from sqlite3Atoi64() which requires the
** input number to be zero-terminated.
*/
int sqlite3GetInt32(const char *zNum, int *pValue){
sqlite_int64 v = 0;
int i, c;
int neg = 0;
if( zNum[0]=='-' ){
neg = 1;
zNum++;
}else if( zNum[0]=='+' ){
zNum++;
}
#ifndef SQLITE_OMIT_HEX_INTEGER
else if( zNum[0]=='0'
&& (zNum[1]=='x' || zNum[1]=='X')
&& sqlite3Isxdigit(zNum[2])
){
u32 u = 0;
zNum += 2;
while( zNum[0]=='0' ) zNum++;
for(i=0; i<8 && sqlite3Isxdigit(zNum[i]); i++){
u = u*16 + sqlite3HexToInt(zNum[i]);
}
if( (u&0x80000000)==0 && sqlite3Isxdigit(zNum[i])==0 ){
memcpy(pValue, &u, 4);
return 1;
}else{
return 0;
}
}
#endif
if( !sqlite3Isdigit(zNum[0]) ) return 0;
while( zNum[0]=='0' ) zNum++;
for(i=0; i<11 && (c = zNum[i] - '0')>=0 && c<=9; i++){
v = v*10 + c;
}
/* The longest decimal representation of a 32 bit integer is 10 digits:
**
** 1234567890
** 2^31 -> 2147483648
*/
testcase( i==10 );
if( i>10 ){
return 0;
}
testcase( v-neg==2147483647 );
if( v-neg>2147483647 ){
return 0;
}
if( neg ){
v = -v;
}
*pValue = (int)v;
return 1;
}
/*
** Return a 32-bit integer value extracted from a string. If the
** string is not an integer, just return 0.
*/
int sqlite3Atoi(const char *z){
int x = 0;
sqlite3GetInt32(z, &x);
return x;
}
/*
** Decode a floating-point value into an approximate decimal
** representation.
**
** Round the decimal representation to n significant digits if
** n is positive. Or round to -n signficant digits after the
** decimal point if n is negative. No rounding is performed if
** n is zero.
**
** The significant digits of the decimal representation are
** stored in p->z[] which is a often (but not always) a pointer
** into the middle of p->zBuf[]. There are p->n significant digits.
** The p->z[] array is *not* zero-terminated.
*/
void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
int i;
u64 v;
int e, exp = 0;
p->isSpecial = 0;
p->z = p->zBuf;
/* Convert negative numbers to positive. Deal with Infinity, 0.0, and
** NaN. */
if( r<0.0 ){
p->sign = '-';
r = -r;
}else if( r==0.0 ){
p->sign = '+';
p->n = 1;
p->iDP = 1;
p->z = "0";
return;
}else{
p->sign = '+';
}
memcpy(&v,&r,8);
e = v>>52;
if( (e&0x7ff)==0x7ff ){
p->isSpecial = 1 + (v!=0x7ff0000000000000LL);
p->n = 0;
p->iDP = 0;