lib/sqlite/sqlite3.c

21027 ** Compare the 19-character string zNum against the text representation
21029 ** if zNum is less than, equal to, or greater than the string.
21030 ** Note that zNum must contain exactly 19 characters.
21040 static int compare2pow63(const char *zNum, int incr){
21046     c = (zNum[i*incr]-pow63[i])*10;
21049     c = zNum[18*incr] - '8';
21059 ** Convert zNum to a 64-bit signed integer.
21061 ** If the zNum value is representable as a 64-bit twos-complement
21064 ** If zNum is exactly 9223372036854665808, return 2.  This special
21068 ** If zNum is too big for a 64-bit integer and is not
21075 SQLITE_PRIVATE int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
21082   const char *zEnd = zNum + length;
21083   if( enc==SQLITE_UTF16BE ) zNum++;
21084   while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
21085   if( zNum<zEnd ){
21086     if( *zNum=='-' ){
21088       zNum+=incr;
21089     }else if( *zNum=='+' ){
21090       zNum+=incr;
21093   zStart = zNum;
21094   while( zNum<zEnd && zNum[0]=='0' ){ zNum+=incr; } /* Skip leading zeros. */
21095   for(i=0; &zNum[i]<zEnd && (c=zNum[i])>='0' && c<='9'; i+=incr){
21108   if( (c!=0 && &zNum[i]<zEnd) || (i==0 && zStart==zNum) || i>19*incr ){
21109     /* zNum is empty or contains non-numeric text or is longer
21117     /* zNum is a 19-digit numbers.  Compare it against 9223372036854775808. */
21118     c = compare2pow63(zNum, incr);
21120       /* zNum is less than 9223372036854775808 so it fits */
21124       /* zNum is greater than 9223372036854775808 so it overflows */
21127       /* zNum is exactly 9223372036854775808.  Fits if negative.  The
21137 ** If zNum represents an integer that will fit in 32-bits, then set
21140 ** Any non-numeric characters that following zNum are ignored.
21144 SQLITE_PRIVATE int sqlite3GetInt32(const char *zNum, int *pValue){
21148   if( zNum[0]=='-' ){
21150     zNum++;
21151   }else if( zNum[0]=='+' ){
21152     zNum++;
21154   while( zNum[0]=='0' ) zNum++;
21155   for(i=0; i<11 && (c = zNum[i] - '0')>=0 && c<=9; i++){