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-/*
-** 2002 February 23
-**
-** 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.
-**
-*************************************************************************
-** This file contains the C functions that implement various SQL
-** functions of SQLite.
-**
-** There is only one exported symbol in this file - the function
-** sqliteRegisterBuildinFunctions() found at the bottom of the file.
-** All other code has file scope.
-**
-** $Id$
-*/
-#include "sqliteInt.h"
-#include <ctype.h>
-#include <math.h>
-#include <stdlib.h>
-#include <assert.h>
-#include "vdbeInt.h"
-#include "os.h"
-
-/*
-** Return the collating function associated with a function.
-*/
-static CollSeq *sqlite3GetFuncCollSeq(sqlite3_context *context){
- return context->pColl;
-}
-
-/*
-** Implementation of the non-aggregate min() and max() functions
-*/
-static void minmaxFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- int i;
- int mask; /* 0 for min() or 0xffffffff for max() */
- int iBest;
- CollSeq *pColl;
-
- if( argc==0 ) return;
- mask = sqlite3_user_data(context)==0 ? 0 : -1;
- pColl = sqlite3GetFuncCollSeq(context);
- assert( pColl );
- assert( mask==-1 || mask==0 );
- iBest = 0;
- if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
- for(i=1; i<argc; i++){
- if( sqlite3_value_type(argv[i])==SQLITE_NULL ) return;
- if( (sqlite3MemCompare(argv[iBest], argv[i], pColl)^mask)>=0 ){
- iBest = i;
- }
- }
- sqlite3_result_value(context, argv[iBest]);
-}
-
-/*
-** Return the type of the argument.
-*/
-static void typeofFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- const char *z = 0;
- switch( sqlite3_value_type(argv[0]) ){
- case SQLITE_NULL: z = "null"; break;
- case SQLITE_INTEGER: z = "integer"; break;
- case SQLITE_TEXT: z = "text"; break;
- case SQLITE_FLOAT: z = "real"; break;
- case SQLITE_BLOB: z = "blob"; break;
- }
- sqlite3_result_text(context, z, -1, SQLITE_STATIC);
-}
-
-
-/*
-** Implementation of the length() function
-*/
-static void lengthFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- int len;
-
- assert( argc==1 );
- switch( sqlite3_value_type(argv[0]) ){
- case SQLITE_BLOB:
- case SQLITE_INTEGER:
- case SQLITE_FLOAT: {
- sqlite3_result_int(context, sqlite3_value_bytes(argv[0]));
- break;
- }
- case SQLITE_TEXT: {
- const char *z = sqlite3_value_text(argv[0]);
- for(len=0; *z; z++){ if( (0xc0&*z)!=0x80 ) len++; }
- sqlite3_result_int(context, len);
- break;
- }
- default: {
- sqlite3_result_null(context);
- break;
- }
- }
-}
-
-/*
-** Implementation of the abs() function
-*/
-static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- assert( argc==1 );
- switch( sqlite3_value_type(argv[0]) ){
- case SQLITE_INTEGER: {
- i64 iVal = sqlite3_value_int64(argv[0]);
- if( iVal<0 ) iVal = iVal * -1;
- sqlite3_result_int64(context, iVal);
- break;
- }
- case SQLITE_NULL: {
- sqlite3_result_null(context);
- break;
- }
- default: {
- double rVal = sqlite3_value_double(argv[0]);
- if( rVal<0 ) rVal = rVal * -1.0;
- sqlite3_result_double(context, rVal);
- break;
- }
- }
-}
-
-/*
-** Implementation of the substr() function
-*/
-static void substrFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- const char *z;
- const char *z2;
- int i;
- int p1, p2, len;
-
- assert( argc==3 );
- z = sqlite3_value_text(argv[0]);
- if( z==0 ) return;
- p1 = sqlite3_value_int(argv[1]);
- p2 = sqlite3_value_int(argv[2]);
- for(len=0, z2=z; *z2; z2++){ if( (0xc0&*z2)!=0x80 ) len++; }
- if( p1<0 ){
- p1 += len;
- if( p1<0 ){
- p2 += p1;
- p1 = 0;
- }
- }else if( p1>0 ){
- p1--;
- }
- if( p1+p2>len ){
- p2 = len-p1;
- }
- for(i=0; i<p1 && z[i]; i++){
- if( (z[i]&0xc0)==0x80 ) p1++;
- }
- while( z[i] && (z[i]&0xc0)==0x80 ){ i++; p1++; }
- for(; i<p1+p2 && z[i]; i++){
- if( (z[i]&0xc0)==0x80 ) p2++;
- }
- while( z[i] && (z[i]&0xc0)==0x80 ){ i++; p2++; }
- if( p2<0 ) p2 = 0;
- sqlite3_result_text(context, &z[p1], p2, SQLITE_TRANSIENT);
-}
-
-/*
-** Implementation of the round() function
-*/
-static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- int n = 0;
- double r;
- char zBuf[500]; /* larger than the %f representation of the largest double */
- assert( argc==1 || argc==2 );
- if( argc==2 ){
- if( SQLITE_NULL==sqlite3_value_type(argv[1]) ) return;
- n = sqlite3_value_int(argv[1]);
- if( n>30 ) n = 30;
- if( n<0 ) n = 0;
- }
- if( SQLITE_NULL==sqlite3_value_type(argv[0]) ) return;
- r = sqlite3_value_double(argv[0]);
- sqlite3_snprintf(sizeof(zBuf),zBuf,"%.*f",n,r);
- sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
-}
-
-/*
-** Implementation of the upper() and lower() SQL functions.
-*/
-static void upperFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- unsigned char *z;
- int i;
- if( argc<1 || SQLITE_NULL==sqlite3_value_type(argv[0]) ) return;
- z = sqliteMalloc(sqlite3_value_bytes(argv[0])+1);
- if( z==0 ) return;
- strcpy(z, sqlite3_value_text(argv[0]));
- for(i=0; z[i]; i++){
- z[i] = toupper(z[i]);
- }
- sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
- sqliteFree(z);
-}
-static void lowerFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- unsigned char *z;
- int i;
- if( argc<1 || SQLITE_NULL==sqlite3_value_type(argv[0]) ) return;
- z = sqliteMalloc(sqlite3_value_bytes(argv[0])+1);
- if( z==0 ) return;
- strcpy(z, sqlite3_value_text(argv[0]));
- for(i=0; z[i]; i++){
- z[i] = tolower(z[i]);
- }
- sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
- sqliteFree(z);
-}
-
-/*
-** Implementation of the IFNULL(), NVL(), and COALESCE() functions.
-** All three do the same thing. They return the first non-NULL
-** argument.
-*/
-static void ifnullFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- int i;
- for(i=0; i<argc; i++){
- if( SQLITE_NULL!=sqlite3_value_type(argv[i]) ){
- sqlite3_result_value(context, argv[i]);
- break;
- }
- }
-}
-
-/*
-** Implementation of random(). Return a random integer.
-*/
-static void randomFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- int r;
- sqlite3Randomness(sizeof(r), &r);
- sqlite3_result_int(context, r);
-}
-
-/*
-** Implementation of the last_insert_rowid() SQL function. The return
-** value is the same as the sqlite3_last_insert_rowid() API function.
-*/
-static void last_insert_rowid(
- sqlite3_context *context,
- int arg,
- sqlite3_value **argv
-){
- sqlite3 *db = sqlite3_user_data(context);
- sqlite3_result_int64(context, sqlite3_last_insert_rowid(db));
-}
-
-/*
-** Implementation of the changes() SQL function. The return value is the
-** same as the sqlite3_changes() API function.
-*/
-static void changes(
- sqlite3_context *context,
- int arg,
- sqlite3_value **argv
-){
- sqlite3 *db = sqlite3_user_data(context);
- sqlite3_result_int(context, sqlite3_changes(db));
-}
-
-/*
-** Implementation of the total_changes() SQL function. The return value is
-** the same as the sqlite3_total_changes() API function.
-*/
-static void total_changes(
- sqlite3_context *context,
- int arg,
- sqlite3_value **argv
-){
- sqlite3 *db = sqlite3_user_data(context);
- sqlite3_result_int(context, sqlite3_total_changes(db));
-}
-
-/*
-** A structure defining how to do GLOB-style comparisons.
-*/
-struct compareInfo {
- u8 matchAll;
- u8 matchOne;
- u8 matchSet;
- u8 noCase;
-};
-
-static const struct compareInfo globInfo = { '*', '?', '[', 0 };
-/* The correct SQL-92 behavior is for the LIKE operator to ignore
-** case. Thus 'a' LIKE 'A' would be true. */
-static const struct compareInfo likeInfoNorm = { '%', '_', 0, 1 };
-/* If SQLITE_CASE_SENSITIVE_LIKE is defined, then the LIKE operator
-** is case sensitive causing 'a' LIKE 'A' to be false */
-static const struct compareInfo likeInfoAlt = { '%', '_', 0, 0 };
-
-/*
-** X is a pointer to the first byte of a UTF-8 character. Increment
-** X so that it points to the next character. This only works right
-** if X points to a well-formed UTF-8 string.
-*/
-#define sqliteNextChar(X) while( (0xc0&*++(X))==0x80 ){}
-#define sqliteCharVal(X) sqlite3ReadUtf8(X)
-
-
-/*
-** Compare two UTF-8 strings for equality where the first string can
-** potentially be a "glob" expression. Return true (1) if they
-** are the same and false (0) if they are different.
-**
-** Globbing rules:
-**
-** '*' Matches any sequence of zero or more characters.
-**
-** '?' Matches exactly one character.
-**
-** [...] Matches one character from the enclosed list of
-** characters.
-**
-** [^...] Matches one character not in the enclosed list.
-**
-** With the [...] and [^...] matching, a ']' character can be included
-** in the list by making it the first character after '[' or '^'. A
-** range of characters can be specified using '-'. Example:
-** "[a-z]" matches any single lower-case letter. To match a '-', make
-** it the last character in the list.
-**
-** This routine is usually quick, but can be N**2 in the worst case.
-**
-** Hints: to match '*' or '?', put them in "[]". Like this:
-**
-** abc[*]xyz Matches "abc*xyz" only
-*/
-static int patternCompare(
- const u8 *zPattern, /* The glob pattern */
- const u8 *zString, /* The string to compare against the glob */
- const struct compareInfo *pInfo, /* Information about how to do the compare */
- const int esc /* The escape character */
-){
- register int c;
- int invert;
- int seen;
- int c2;
- u8 matchOne = pInfo->matchOne;
- u8 matchAll = pInfo->matchAll;
- u8 matchSet = pInfo->matchSet;
- u8 noCase = pInfo->noCase;
- int prevEscape = 0; /* True if the previous character was 'escape' */
-
- while( (c = *zPattern)!=0 ){
- if( !prevEscape && c==matchAll ){
- while( (c=zPattern[1]) == matchAll || c == matchOne ){
- if( c==matchOne ){
- if( *zString==0 ) return 0;
- sqliteNextChar(zString);
- }
- zPattern++;
- }
- if( c && esc && sqlite3ReadUtf8(&zPattern[1])==esc ){
- u8 const *zTemp = &zPattern[1];
- sqliteNextChar(zTemp);
- c = *zTemp;
- }
- if( c==0 ) return 1;
- if( c==matchSet ){
- assert( esc==0 ); /* This is GLOB, not LIKE */
- while( *zString && patternCompare(&zPattern[1],zString,pInfo,esc)==0 ){
- sqliteNextChar(zString);
- }
- return *zString!=0;
- }else{
- while( (c2 = *zString)!=0 ){
- if( noCase ){
- c2 = sqlite3UpperToLower[c2];
- c = sqlite3UpperToLower[c];
- while( c2 != 0 && c2 != c ){ c2 = sqlite3UpperToLower[*++zString]; }
- }else{
- while( c2 != 0 && c2 != c ){ c2 = *++zString; }
- }
- if( c2==0 ) return 0;
- if( patternCompare(&zPattern[1],zString,pInfo,esc) ) return 1;
- sqliteNextChar(zString);
- }
- return 0;
- }
- }else if( !prevEscape && c==matchOne ){
- if( *zString==0 ) return 0;
- sqliteNextChar(zString);
- zPattern++;
- }else if( c==matchSet ){
- int prior_c = 0;
- assert( esc==0 ); /* This only occurs for GLOB, not LIKE */
- seen = 0;
- invert = 0;
- c = sqliteCharVal(zString);
- if( c==0 ) return 0;
- c2 = *++zPattern;
- if( c2=='^' ){ invert = 1; c2 = *++zPattern; }
- if( c2==']' ){
- if( c==']' ) seen = 1;
- c2 = *++zPattern;
- }
- while( (c2 = sqliteCharVal(zPattern))!=0 && c2!=']' ){
- if( c2=='-' && zPattern[1]!=']' && zPattern[1]!=0 && prior_c>0 ){
- zPattern++;
- c2 = sqliteCharVal(zPattern);
- if( c>=prior_c && c<=c2 ) seen = 1;
- prior_c = 0;
- }else if( c==c2 ){
- seen = 1;
- prior_c = c2;
- }else{
- prior_c = c2;
- }
- sqliteNextChar(zPattern);
- }
- if( c2==0 || (seen ^ invert)==0 ) return 0;
- sqliteNextChar(zString);
- zPattern++;
- }else if( esc && !prevEscape && sqlite3ReadUtf8(zPattern)==esc){
- prevEscape = 1;
- sqliteNextChar(zPattern);
- }else{
- if( noCase ){
- if( sqlite3UpperToLower[c] != sqlite3UpperToLower[*zString] ) return 0;
- }else{
- if( c != *zString ) return 0;
- }
- zPattern++;
- zString++;
- prevEscape = 0;
- }
- }
- return *zString==0;
-}
-
-/*
-** Count the number of times that the LIKE operator (or GLOB which is
-** just a variation of LIKE) gets called. This is used for testing
-** only.
-*/
-#ifdef SQLITE_TEST
-int sqlite3_like_count = 0;
-#endif
-
-
-/*
-** Implementation of the like() SQL function. This function implements
-** the build-in LIKE operator. The first argument to the function is the
-** pattern and the second argument is the string. So, the SQL statements:
-**
-** A LIKE B
-**
-** is implemented as like(B,A).
-**
-** This same function (with a different compareInfo structure) computes
-** the GLOB operator.
-*/
-static void likeFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- const unsigned char *zA = sqlite3_value_text(argv[0]);
- const unsigned char *zB = sqlite3_value_text(argv[1]);
- int escape = 0;
- if( argc==3 ){
- /* The escape character string must consist of a single UTF-8 character.
- ** Otherwise, return an error.
- */
- const unsigned char *zEsc = sqlite3_value_text(argv[2]);
- if( sqlite3utf8CharLen(zEsc, -1)!=1 ){
- sqlite3_result_error(context,
- "ESCAPE expression must be a single character", -1);
- return;
- }
- escape = sqlite3ReadUtf8(zEsc);
- }
- if( zA && zB ){
- struct compareInfo *pInfo = sqlite3_user_data(context);
-#ifdef SQLITE_TEST
- sqlite3_like_count++;
-#endif
- sqlite3_result_int(context, patternCompare(zA, zB, pInfo, escape));
- }
-}
-
-/*
-** Implementation of the NULLIF(x,y) function. The result is the first
-** argument if the arguments are different. The result is NULL if the
-** arguments are equal to each other.
-*/
-static void nullifFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- CollSeq *pColl = sqlite3GetFuncCollSeq(context);
- if( sqlite3MemCompare(argv[0], argv[1], pColl)!=0 ){
- sqlite3_result_value(context, argv[0]);
- }
-}
-
-/*
-** Implementation of the VERSION(*) function. The result is the version
-** of the SQLite library that is running.
-*/
-static void versionFunc(
- sqlite3_context *context,
- int argc,
- sqlite3_value **argv
-){
- sqlite3_result_text(context, sqlite3_version, -1, SQLITE_STATIC);
-}
-
-
-/*
-** EXPERIMENTAL - This is not an official function. The interface may
-** change. This function may disappear. Do not write code that depends
-** on this function.
-**
-** Implementation of the QUOTE() function. This function takes a single
-** argument. If the argument is numeric, the return value is the same as
-** the argument. If the argument is NULL, the return value is the string
-** "NULL". Otherwise, the argument is enclosed in single quotes with
-** single-quote escapes.
-*/
-static void quoteFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- if( argc<1 ) return;
- switch( sqlite3_value_type(argv[0]) ){
- case SQLITE_NULL: {
- sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
- break;
- }
- case SQLITE_INTEGER:
- case SQLITE_FLOAT: {
- sqlite3_result_value(context, argv[0]);
- break;
- }
- case SQLITE_BLOB: {
- static const char hexdigits[] = {
- '0', '1', '2', '3', '4', '5', '6', '7',
- '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
- };
- char *zText = 0;
- int nBlob = sqlite3_value_bytes(argv[0]);
- char const *zBlob = sqlite3_value_blob(argv[0]);
-
- zText = (char *)sqliteMalloc((2*nBlob)+4);
- if( !zText ){
- sqlite3_result_error(context, "out of memory", -1);
- }else{
- int i;
- for(i=0; i<nBlob; i++){
- zText[(i*2)+2] = hexdigits[(zBlob[i]>>4)&0x0F];
- zText[(i*2)+3] = hexdigits[(zBlob[i])&0x0F];
- }
- zText[(nBlob*2)+2] = '\'';
- zText[(nBlob*2)+3] = '\0';
- zText[0] = 'X';
- zText[1] = '\'';
- sqlite3_result_text(context, zText, -1, SQLITE_TRANSIENT);
- sqliteFree(zText);
- }
- break;
- }
- case SQLITE_TEXT: {
- int i,j,n;
- const char *zArg = sqlite3_value_text(argv[0]);
- char *z;
-
- for(i=n=0; zArg[i]; i++){ if( zArg[i]=='\'' ) n++; }
- z = sqliteMalloc( i+n+3 );
- if( z==0 ) return;
- z[0] = '\'';
- for(i=0, j=1; zArg[i]; i++){
- z[j++] = zArg[i];
- if( zArg[i]=='\'' ){
- z[j++] = '\'';
- }
- }
- z[j++] = '\'';
- z[j] = 0;
- sqlite3_result_text(context, z, j, SQLITE_TRANSIENT);
- sqliteFree(z);
- }
- }
-}
-
-#ifdef SQLITE_SOUNDEX
-/*
-** Compute the soundex encoding of a word.
-*/
-static void soundexFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
- char zResult[8];
- const u8 *zIn;
- int i, j;
- static const unsigned char iCode[] = {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
- 1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
- 0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
- 1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
- };
- assert( argc==1 );
- zIn = (u8*)sqlite3_value_text(argv[0]);
- for(i=0; zIn[i] && !isalpha(zIn[i]); i++){}
- if( zIn[i] ){
- zResult[0] = toupper(zIn[i]);
- for(j=1; j<4 && zIn[i]; i++){
- int code = iCode[zIn[i]&0x7f];
- if( code>0 ){
- zResult[j++] = code + '0';
- }
- }
- while( j<4 ){
- zResult[j++] = '0';
- }
- zResult[j] = 0;
- sqlite3_result_text(context, zResult, 4, SQLITE_TRANSIENT);
- }else{
- sqlite3_result_text(context, "?000", 4, SQLITE_STATIC);
- }
-}
-#endif
-
-#ifdef SQLITE_TEST
-/*
-** This function generates a string of random characters. Used for
-** generating test data.
-*/
-static void randStr(sqlite3_context *context, int argc, sqlite3_value **argv){
- static const unsigned char zSrc[] =
- "abcdefghijklmnopqrstuvwxyz"
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- "0123456789"
- ".-!,:*^+=_|?/<> ";
- int iMin, iMax, n, r, i;
- unsigned char zBuf[1000];
- if( argc>=1 ){
- iMin = sqlite3_value_int(argv[0]);
- if( iMin<0 ) iMin = 0;
- if( iMin>=sizeof(zBuf) ) iMin = sizeof(zBuf)-1;
- }else{
- iMin = 1;
- }
- if( argc>=2 ){
- iMax = sqlite3_value_int(argv[1]);
- if( iMax<iMin ) iMax = iMin;
- if( iMax>=sizeof(zBuf) ) iMax = sizeof(zBuf)-1;
- }else{
- iMax = 50;
- }
- n = iMin;
- if( iMax>iMin ){
- sqlite3Randomness(sizeof(r), &r);
- r &= 0x7fffffff;
- n += r%(iMax + 1 - iMin);
- }
- assert( n<sizeof(zBuf) );
- sqlite3Randomness(n, zBuf);
- for(i=0; i<n; i++){
- zBuf[i] = zSrc[zBuf[i]%(sizeof(zSrc)-1)];
- }
- zBuf[n] = 0;
- sqlite3_result_text(context, zBuf, n, SQLITE_TRANSIENT);
-}
-#endif /* SQLITE_TEST */
-
-#ifdef SQLITE_TEST
-/*
-** The following two SQL functions are used to test returning a text
-** result with a destructor. Function 'test_destructor' takes one argument
-** and returns the same argument interpreted as TEXT. A destructor is
-** passed with the sqlite3_result_text() call.
-**
-** SQL function 'test_destructor_count' returns the number of outstanding
-** allocations made by 'test_destructor';
-**
-** WARNING: Not threadsafe.
-*/
-static int test_destructor_count_var = 0;
-static void destructor(void *p){
- char *zVal = (char *)p;
- assert(zVal);
- zVal--;
- sqliteFree(zVal);
- test_destructor_count_var--;
-}
-static void test_destructor(
- sqlite3_context *pCtx,
- int nArg,
- sqlite3_value **argv
-){
- char *zVal;
- int len;
- sqlite3 *db = sqlite3_user_data(pCtx);
-
- test_destructor_count_var++;
- assert( nArg==1 );
- if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
- len = sqlite3ValueBytes(argv[0], db->enc);
- zVal = sqliteMalloc(len+3);
- zVal[len] = 0;
- zVal[len-1] = 0;
- assert( zVal );
- zVal++;
- memcpy(zVal, sqlite3ValueText(argv[0], db->enc), len);
- if( db->enc==SQLITE_UTF8 ){
- sqlite3_result_text(pCtx, zVal, -1, destructor);
-#ifndef SQLITE_OMIT_UTF16
- }else if( db->enc==SQLITE_UTF16LE ){
- sqlite3_result_text16le(pCtx, zVal, -1, destructor);
- }else{
- sqlite3_result_text16be(pCtx, zVal, -1, destructor);
-#endif /* SQLITE_OMIT_UTF16 */
- }
-}
-static void test_destructor_count(
- sqlite3_context *pCtx,
- int nArg,
- sqlite3_value **argv
-){
- sqlite3_result_int(pCtx, test_destructor_count_var);
-}
-#endif /* SQLITE_TEST */
-
-#ifdef SQLITE_TEST
-/*
-** Routines for testing the sqlite3_get_auxdata() and sqlite3_set_auxdata()
-** interface.
-**
-** The test_auxdata() SQL function attempts to register each of its arguments
-** as auxiliary data. If there are no prior registrations of aux data for
-** that argument (meaning the argument is not a constant or this is its first
-** call) then the result for that argument is 0. If there is a prior
-** registration, the result for that argument is 1. The overall result
-** is the individual argument results separated by spaces.
-*/
-static void free_test_auxdata(void *p) {sqliteFree(p);}
-static void test_auxdata(
- sqlite3_context *pCtx,
- int nArg,
- sqlite3_value **argv
-){
- int i;
- char *zRet = sqliteMalloc(nArg*2);
- if( !zRet ) return;
- for(i=0; i<nArg; i++){
- char const *z = sqlite3_value_text(argv[i]);
- if( z ){
- char *zAux = sqlite3_get_auxdata(pCtx, i);
- if( zAux ){
- zRet[i*2] = '1';
- if( strcmp(zAux, z) ){
- sqlite3_result_error(pCtx, "Auxilary data corruption", -1);
- return;
- }
- }else{
- zRet[i*2] = '0';
- zAux = sqliteStrDup(z);
- sqlite3_set_auxdata(pCtx, i, zAux, free_test_auxdata);
- }
- zRet[i*2+1] = ' ';
- }
- }
- sqlite3_result_text(pCtx, zRet, 2*nArg-1, free_test_auxdata);
-}
-#endif /* SQLITE_TEST */
-
-#ifdef SQLITE_TEST
-/*
-** A function to test error reporting from user functions. This function
-** returns a copy of it's first argument as an error.
-*/
-static void test_error(
- sqlite3_context *pCtx,
- int nArg,
- sqlite3_value **argv
-){
- sqlite3_result_error(pCtx, sqlite3_value_text(argv[0]), 0);
-}
-#endif /* SQLITE_TEST */
-
-/*
-** An instance of the following structure holds the context of a
-** sum() or avg() aggregate computation.
-*/
-typedef struct SumCtx SumCtx;
-struct SumCtx {
- double sum; /* Sum of terms */
- int cnt; /* Number of elements summed */
- u8 seenFloat; /* True if there has been any floating point value */
-};
-
-/*
-** Routines used to compute the sum or average.
-*/
-static void sumStep(sqlite3_context *context, int argc, sqlite3_value **argv){
- SumCtx *p;
- int type;
- assert( argc==1 );
- p = sqlite3_aggregate_context(context, sizeof(*p));
- type = sqlite3_value_type(argv[0]);
- if( p && type!=SQLITE_NULL ){
- p->sum += sqlite3_value_double(argv[0]);
- p->cnt++;
- if( type==SQLITE_FLOAT ){
- p->seenFloat = 1;
- }
- }
-}
-static void sumFinalize(sqlite3_context *context){
- SumCtx *p;
- p = sqlite3_aggregate_context(context, 0);
- if( p && p->cnt>0 ){
- if( p->seenFloat ){
- sqlite3_result_double(context, p->sum);
- }else{
- sqlite3_result_int64(context, (i64)p->sum);
- }
- }
-}
-static void avgFinalize(sqlite3_context *context){
- SumCtx *p;
- p = sqlite3_aggregate_context(context, 0);
- if( p && p->cnt>0 ){
- sqlite3_result_double(context, p->sum/(double)p->cnt);
- }
-}
-
-/*
-** An instance of the following structure holds the context of a
-** variance or standard deviation computation.
-*/
-typedef struct StdDevCtx StdDevCtx;
-struct StdDevCtx {
- double sum; /* Sum of terms */
- double sum2; /* Sum of the squares of terms */
- int cnt; /* Number of terms counted */
-};
-
-/*
-** The following structure keeps track of state information for the
-** count() aggregate function.
-*/
-typedef struct CountCtx CountCtx;
-struct CountCtx {
- int n;
-};
-
-/*
-** Routines to implement the count() aggregate function.
-*/
-static void countStep(sqlite3_context *context, int argc, sqlite3_value **argv){
- CountCtx *p;
- p = sqlite3_aggregate_context(context, sizeof(*p));
- if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0])) && p ){
- p->n++;
- }
-}
-static void countFinalize(sqlite3_context *context){
- CountCtx *p;
- p = sqlite3_aggregate_context(context, 0);
- sqlite3_result_int(context, p ? p->n : 0);
-}
-
-/*
-** Routines to implement min() and max() aggregate functions.
-*/
-static void minmaxStep(sqlite3_context *context, int argc, sqlite3_value **argv){
- Mem *pArg = (Mem *)argv[0];
- Mem *pBest;
-
- if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
- pBest = (Mem *)sqlite3_aggregate_context(context, sizeof(*pBest));
- if( !pBest ) return;
-
- if( pBest->flags ){
- int max;
- int cmp;
- CollSeq *pColl = sqlite3GetFuncCollSeq(context);
- /* This step function is used for both the min() and max() aggregates,
- ** the only difference between the two being that the sense of the
- ** comparison is inverted. For the max() aggregate, the
- ** sqlite3_user_data() function returns (void *)-1. For min() it
- ** returns (void *)db, where db is the sqlite3* database pointer.
- ** Therefore the next statement sets variable 'max' to 1 for the max()
- ** aggregate, or 0 for min().
- */
- max = ((sqlite3_user_data(context)==(void *)-1)?1:0);
- cmp = sqlite3MemCompare(pBest, pArg, pColl);
- if( (max && cmp<0) || (!max && cmp>0) ){
- sqlite3VdbeMemCopy(pBest, pArg);
- }
- }else{
- sqlite3VdbeMemCopy(pBest, pArg);
- }
-}
-static void minMaxFinalize(sqlite3_context *context){
- sqlite3_value *pRes;
- pRes = (sqlite3_value *)sqlite3_aggregate_context(context, 0);
- if( pRes ){
- if( pRes->flags ){
- sqlite3_result_value(context, pRes);
- }
- sqlite3VdbeMemRelease(pRes);
- }
-}
-
-
-/*
-** This function registered all of the above C functions as SQL
-** functions. This should be the only routine in this file with
-** external linkage.
-*/
-void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
- static const struct {
- char *zName;
- signed char nArg;
- u8 argType; /* 0: none. 1: db 2: (-1) */
- u8 eTextRep; /* 1: UTF-16. 0: UTF-8 */
- u8 needCollSeq;
- void (*xFunc)(sqlite3_context*,int,sqlite3_value **);
- } aFuncs[] = {
- { "min", -1, 0, SQLITE_UTF8, 1, minmaxFunc },
- { "min", 0, 0, SQLITE_UTF8, 1, 0 },
- { "max", -1, 2, SQLITE_UTF8, 1, minmaxFunc },
- { "max", 0, 2, SQLITE_UTF8, 1, 0 },
- { "typeof", 1, 0, SQLITE_UTF8, 0, typeofFunc },
- { "length", 1, 0, SQLITE_UTF8, 0, lengthFunc },
- { "substr", 3, 0, SQLITE_UTF8, 0, substrFunc },
-#ifndef SQLITE_OMIT_UTF16
- { "substr", 3, 0, SQLITE_UTF16LE, 0, sqlite3utf16Substr },
-#endif
- { "abs", 1, 0, SQLITE_UTF8, 0, absFunc },
- { "round", 1, 0, SQLITE_UTF8, 0, roundFunc },
- { "round", 2, 0, SQLITE_UTF8, 0, roundFunc },
- { "upper", 1, 0, SQLITE_UTF8, 0, upperFunc },
- { "lower", 1, 0, SQLITE_UTF8, 0, lowerFunc },
- { "coalesce", -1, 0, SQLITE_UTF8, 0, ifnullFunc },
- { "coalesce", 0, 0, SQLITE_UTF8, 0, 0 },
- { "coalesce", 1, 0, SQLITE_UTF8, 0, 0 },
- { "ifnull", 2, 0, SQLITE_UTF8, 1, ifnullFunc },
- { "random", -1, 0, SQLITE_UTF8, 0, randomFunc },
- { "nullif", 2, 0, SQLITE_UTF8, 1, nullifFunc },
- { "sqlite_version", 0, 0, SQLITE_UTF8, 0, versionFunc},
- { "quote", 1, 0, SQLITE_UTF8, 0, quoteFunc },
- { "last_insert_rowid", 0, 1, SQLITE_UTF8, 0, last_insert_rowid },
- { "changes", 0, 1, SQLITE_UTF8, 0, changes },
- { "total_changes", 0, 1, SQLITE_UTF8, 0, total_changes },
-#ifdef SQLITE_SOUNDEX
- { "soundex", 1, 0, SQLITE_UTF8, 0, soundexFunc},
-#endif
-#ifdef SQLITE_TEST
- { "randstr", 2, 0, SQLITE_UTF8, 0, randStr },
- { "test_destructor", 1, 1, SQLITE_UTF8, 0, test_destructor},
- { "test_destructor_count", 0, 0, SQLITE_UTF8, 0, test_destructor_count},
- { "test_auxdata", -1, 0, SQLITE_UTF8, 0, test_auxdata},
- { "test_error", 1, 0, SQLITE_UTF8, 0, test_error},
-#endif
- };
- static const struct {
- char *zName;
- signed char nArg;
- u8 argType;
- u8 needCollSeq;
- void (*xStep)(sqlite3_context*,int,sqlite3_value**);
- void (*xFinalize)(sqlite3_context*);
- } aAggs[] = {
- { "min", 1, 0, 1, minmaxStep, minMaxFinalize },
- { "max", 1, 2, 1, minmaxStep, minMaxFinalize },
- { "sum", 1, 0, 0, sumStep, sumFinalize },
- { "avg", 1, 0, 0, sumStep, avgFinalize },
- { "count", 0, 0, 0, countStep, countFinalize },
- { "count", 1, 0, 0, countStep, countFinalize },
- };
- int i;
-
- for(i=0; i<sizeof(aFuncs)/sizeof(aFuncs[0]); i++){
- void *pArg = 0;
- switch( aFuncs[i].argType ){
- case 1: pArg = db; break;
- case 2: pArg = (void *)(-1); break;
- }
- sqlite3_create_function(db, aFuncs[i].zName, aFuncs[i].nArg,
- aFuncs[i].eTextRep, pArg, aFuncs[i].xFunc, 0, 0);
- if( aFuncs[i].needCollSeq ){
- FuncDef *pFunc = sqlite3FindFunction(db, aFuncs[i].zName,
- strlen(aFuncs[i].zName), aFuncs[i].nArg, aFuncs[i].eTextRep, 0);
- if( pFunc && aFuncs[i].needCollSeq ){
- pFunc->needCollSeq = 1;
- }
- }
- }
-#ifndef SQLITE_OMIT_ALTERTABLE
- sqlite3AlterFunctions(db);
-#endif
- for(i=0; i<sizeof(aAggs)/sizeof(aAggs[0]); i++){
- void *pArg = 0;
- switch( aAggs[i].argType ){
- case 1: pArg = db; break;
- case 2: pArg = (void *)(-1); break;
- }
- sqlite3_create_function(db, aAggs[i].zName, aAggs[i].nArg, SQLITE_UTF8,
- pArg, 0, aAggs[i].xStep, aAggs[i].xFinalize);
- if( aAggs[i].needCollSeq ){
- FuncDef *pFunc = sqlite3FindFunction( db, aAggs[i].zName,
- strlen(aAggs[i].zName), aAggs[i].nArg, SQLITE_UTF8, 0);
- if( pFunc && aAggs[i].needCollSeq ){
- pFunc->needCollSeq = 1;
- }
- }
- }
- sqlite3RegisterDateTimeFunctions(db);
-#ifdef SQLITE_SSE
- sqlite3SseFunctions(db);
-#endif
-#ifdef SQLITE_CASE_SENSITIVE_LIKE
- sqlite3RegisterLikeFunctions(db, 1);
-#else
- sqlite3RegisterLikeFunctions(db, 0);
-#endif
-}
-
-/*
-** Set the LIKEOPT flag on the 2-argument function with the given name.
-*/
-static void setLikeOptFlag(sqlite3 *db, const char *zName, int flagVal){
- FuncDef *pDef;
- pDef = sqlite3FindFunction(db, zName, strlen(zName), 2, SQLITE_UTF8, 0);
- if( pDef ){
- pDef->flags = flagVal;
- }
-}
-
-/*
-** Register the built-in LIKE and GLOB functions. The caseSensitive
-** parameter determines whether or not the LIKE operator is case
-** sensitive. GLOB is always case sensitive.
-*/
-void sqlite3RegisterLikeFunctions(sqlite3 *db, int caseSensitive){
- struct compareInfo *pInfo;
- if( caseSensitive ){
- pInfo = (struct compareInfo*)&likeInfoAlt;
- }else{
- pInfo = (struct compareInfo*)&likeInfoNorm;
- }
- sqlite3_create_function(db, "like", 2, SQLITE_UTF8, pInfo, likeFunc, 0, 0);
- sqlite3_create_function(db, "like", 3, SQLITE_UTF8, pInfo, likeFunc, 0, 0);
- sqlite3_create_function(db, "glob", 2, SQLITE_UTF8,
- (struct compareInfo*)&globInfo, likeFunc, 0,0);
- setLikeOptFlag(db, "glob", SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE);
- setLikeOptFlag(db, "like",
- caseSensitive ? (SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE) : SQLITE_FUNC_LIKE);
-}
-
-/*
-** pExpr points to an expression which implements a function. If
-** it is appropriate to apply the LIKE optimization to that function
-** then set aWc[0] through aWc[2] to the wildcard characters and
-** return TRUE. If the function is not a LIKE-style function then
-** return FALSE.
-*/
-int sqlite3IsLikeFunction(sqlite3 *db, Expr *pExpr, int *pIsNocase, char *aWc){
- FuncDef *pDef;
- if( pExpr->op!=TK_FUNCTION ){
- return 0;
- }
- if( pExpr->pList->nExpr!=2 ){
- return 0;
- }
- pDef = sqlite3FindFunction(db, pExpr->token.z, pExpr->token.n, 2,
- SQLITE_UTF8, 0);
- if( pDef==0 || (pDef->flags & SQLITE_FUNC_LIKE)==0 ){
- return 0;
- }
-
- /* The memcpy() statement assumes that the wildcard characters are
- ** the first three statements in the compareInfo structure. The
- ** asserts() that follow verify that assumption
- */
- memcpy(aWc, pDef->pUserData, 3);
- assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
- assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
- assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );
- *pIsNocase = (pDef->flags & SQLITE_FUNC_CASE)==0;
- return 1;
-}
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