1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/persistentdata/persistentstorage/sql/SQLite364/func.c Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,1396 @@
1.4 +/*
1.5 +** 2002 February 23
1.6 +**
1.7 +** The author disclaims copyright to this source code. In place of
1.8 +** a legal notice, here is a blessing:
1.9 +**
1.10 +** May you do good and not evil.
1.11 +** May you find forgiveness for yourself and forgive others.
1.12 +** May you share freely, never taking more than you give.
1.13 +**
1.14 +*************************************************************************
1.15 +** This file contains the C functions that implement various SQL
1.16 +** functions of SQLite.
1.17 +**
1.18 +** There is only one exported symbol in this file - the function
1.19 +** sqliteRegisterBuildinFunctions() found at the bottom of the file.
1.20 +** All other code has file scope.
1.21 +**
1.22 +** $Id: func.c,v 1.203 2008/09/03 17:11:16 drh Exp $
1.23 +*/
1.24 +#include "sqliteInt.h"
1.25 +#include <ctype.h>
1.26 +#include <stdlib.h>
1.27 +#include <assert.h>
1.28 +#include "vdbeInt.h"
1.29 +
1.30 +/*
1.31 +** Return the collating function associated with a function.
1.32 +*/
1.33 +static CollSeq *sqlite3GetFuncCollSeq(sqlite3_context *context){
1.34 + return context->pColl;
1.35 +}
1.36 +
1.37 +/*
1.38 +** Implementation of the non-aggregate min() and max() functions
1.39 +*/
1.40 +static void minmaxFunc(
1.41 + sqlite3_context *context,
1.42 + int argc,
1.43 + sqlite3_value **argv
1.44 +){
1.45 + int i;
1.46 + int mask; /* 0 for min() or 0xffffffff for max() */
1.47 + int iBest;
1.48 + CollSeq *pColl;
1.49 +
1.50 + if( argc==0 ) return;
1.51 + mask = sqlite3_user_data(context)==0 ? 0 : -1;
1.52 + pColl = sqlite3GetFuncCollSeq(context);
1.53 + assert( pColl );
1.54 + assert( mask==-1 || mask==0 );
1.55 + iBest = 0;
1.56 + if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
1.57 + for(i=1; i<argc; i++){
1.58 + if( sqlite3_value_type(argv[i])==SQLITE_NULL ) return;
1.59 + if( (sqlite3MemCompare(argv[iBest], argv[i], pColl)^mask)>=0 ){
1.60 + iBest = i;
1.61 + }
1.62 + }
1.63 + sqlite3_result_value(context, argv[iBest]);
1.64 +}
1.65 +
1.66 +/*
1.67 +** Return the type of the argument.
1.68 +*/
1.69 +static void typeofFunc(
1.70 + sqlite3_context *context,
1.71 + int argc,
1.72 + sqlite3_value **argv
1.73 +){
1.74 + const char *z = 0;
1.75 + switch( sqlite3_value_type(argv[0]) ){
1.76 + case SQLITE_NULL: z = "null"; break;
1.77 + case SQLITE_INTEGER: z = "integer"; break;
1.78 + case SQLITE_TEXT: z = "text"; break;
1.79 + case SQLITE_FLOAT: z = "real"; break;
1.80 + case SQLITE_BLOB: z = "blob"; break;
1.81 + }
1.82 + sqlite3_result_text(context, z, -1, SQLITE_STATIC);
1.83 +}
1.84 +
1.85 +
1.86 +/*
1.87 +** Implementation of the length() function
1.88 +*/
1.89 +static void lengthFunc(
1.90 + sqlite3_context *context,
1.91 + int argc,
1.92 + sqlite3_value **argv
1.93 +){
1.94 + int len;
1.95 +
1.96 + assert( argc==1 );
1.97 + switch( sqlite3_value_type(argv[0]) ){
1.98 + case SQLITE_BLOB:
1.99 + case SQLITE_INTEGER:
1.100 + case SQLITE_FLOAT: {
1.101 + sqlite3_result_int(context, sqlite3_value_bytes(argv[0]));
1.102 + break;
1.103 + }
1.104 + case SQLITE_TEXT: {
1.105 + const unsigned char *z = sqlite3_value_text(argv[0]);
1.106 + if( z==0 ) return;
1.107 + len = 0;
1.108 + while( *z ){
1.109 + len++;
1.110 + SQLITE_SKIP_UTF8(z);
1.111 + }
1.112 + sqlite3_result_int(context, len);
1.113 + break;
1.114 + }
1.115 + default: {
1.116 + sqlite3_result_null(context);
1.117 + break;
1.118 + }
1.119 + }
1.120 +}
1.121 +
1.122 +/*
1.123 +** Implementation of the abs() function
1.124 +*/
1.125 +static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
1.126 + assert( argc==1 );
1.127 + switch( sqlite3_value_type(argv[0]) ){
1.128 + case SQLITE_INTEGER: {
1.129 + i64 iVal = sqlite3_value_int64(argv[0]);
1.130 + if( iVal<0 ){
1.131 + if( (iVal<<1)==0 ){
1.132 + sqlite3_result_error(context, "integer overflow", -1);
1.133 + return;
1.134 + }
1.135 + iVal = -iVal;
1.136 + }
1.137 + sqlite3_result_int64(context, iVal);
1.138 + break;
1.139 + }
1.140 + case SQLITE_NULL: {
1.141 + sqlite3_result_null(context);
1.142 + break;
1.143 + }
1.144 + default: {
1.145 + double rVal = sqlite3_value_double(argv[0]);
1.146 + if( rVal<0 ) rVal = -rVal;
1.147 + sqlite3_result_double(context, rVal);
1.148 + break;
1.149 + }
1.150 + }
1.151 +}
1.152 +
1.153 +/*
1.154 +** Implementation of the substr() function.
1.155 +**
1.156 +** substr(x,p1,p2) returns p2 characters of x[] beginning with p1.
1.157 +** p1 is 1-indexed. So substr(x,1,1) returns the first character
1.158 +** of x. If x is text, then we actually count UTF-8 characters.
1.159 +** If x is a blob, then we count bytes.
1.160 +**
1.161 +** If p1 is negative, then we begin abs(p1) from the end of x[].
1.162 +*/
1.163 +static void substrFunc(
1.164 + sqlite3_context *context,
1.165 + int argc,
1.166 + sqlite3_value **argv
1.167 +){
1.168 + const unsigned char *z;
1.169 + const unsigned char *z2;
1.170 + int len;
1.171 + int p0type;
1.172 + i64 p1, p2;
1.173 +
1.174 + assert( argc==3 || argc==2 );
1.175 + p0type = sqlite3_value_type(argv[0]);
1.176 + if( p0type==SQLITE_BLOB ){
1.177 + len = sqlite3_value_bytes(argv[0]);
1.178 + z = sqlite3_value_blob(argv[0]);
1.179 + if( z==0 ) return;
1.180 + assert( len==sqlite3_value_bytes(argv[0]) );
1.181 + }else{
1.182 + z = sqlite3_value_text(argv[0]);
1.183 + if( z==0 ) return;
1.184 + len = 0;
1.185 + for(z2=z; *z2; len++){
1.186 + SQLITE_SKIP_UTF8(z2);
1.187 + }
1.188 + }
1.189 + p1 = sqlite3_value_int(argv[1]);
1.190 + if( argc==3 ){
1.191 + p2 = sqlite3_value_int(argv[2]);
1.192 + }else{
1.193 + p2 = sqlite3_context_db_handle(context)->aLimit[SQLITE_LIMIT_LENGTH];
1.194 + }
1.195 + if( p1<0 ){
1.196 + p1 += len;
1.197 + if( p1<0 ){
1.198 + p2 += p1;
1.199 + p1 = 0;
1.200 + }
1.201 + }else if( p1>0 ){
1.202 + p1--;
1.203 + }
1.204 + if( p1+p2>len ){
1.205 + p2 = len-p1;
1.206 + }
1.207 + if( p0type!=SQLITE_BLOB ){
1.208 + while( *z && p1 ){
1.209 + SQLITE_SKIP_UTF8(z);
1.210 + p1--;
1.211 + }
1.212 + for(z2=z; *z2 && p2; p2--){
1.213 + SQLITE_SKIP_UTF8(z2);
1.214 + }
1.215 + sqlite3_result_text(context, (char*)z, z2-z, SQLITE_TRANSIENT);
1.216 + }else{
1.217 + if( p2<0 ) p2 = 0;
1.218 + sqlite3_result_blob(context, (char*)&z[p1], p2, SQLITE_TRANSIENT);
1.219 + }
1.220 +}
1.221 +
1.222 +/*
1.223 +** Implementation of the round() function
1.224 +*/
1.225 +static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
1.226 + int n = 0;
1.227 + double r;
1.228 + char zBuf[500]; /* larger than the %f representation of the largest double */
1.229 + assert( argc==1 || argc==2 );
1.230 + if( argc==2 ){
1.231 + if( SQLITE_NULL==sqlite3_value_type(argv[1]) ) return;
1.232 + n = sqlite3_value_int(argv[1]);
1.233 + if( n>30 ) n = 30;
1.234 + if( n<0 ) n = 0;
1.235 + }
1.236 + if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
1.237 + r = sqlite3_value_double(argv[0]);
1.238 + sqlite3_snprintf(sizeof(zBuf),zBuf,"%.*f",n,r);
1.239 + sqlite3AtoF(zBuf, &r);
1.240 + sqlite3_result_double(context, r);
1.241 +}
1.242 +
1.243 +/*
1.244 +** Allocate nByte bytes of space using sqlite3_malloc(). If the
1.245 +** allocation fails, call sqlite3_result_error_nomem() to notify
1.246 +** the database handle that malloc() has failed.
1.247 +*/
1.248 +static void *contextMalloc(sqlite3_context *context, i64 nByte){
1.249 + char *z;
1.250 + if( nByte>sqlite3_context_db_handle(context)->aLimit[SQLITE_LIMIT_LENGTH] ){
1.251 + sqlite3_result_error_toobig(context);
1.252 + z = 0;
1.253 + }else{
1.254 + z = sqlite3Malloc(nByte);
1.255 + if( !z && nByte>0 ){
1.256 + sqlite3_result_error_nomem(context);
1.257 + }
1.258 + }
1.259 + return z;
1.260 +}
1.261 +
1.262 +/*
1.263 +** Implementation of the upper() and lower() SQL functions.
1.264 +*/
1.265 +static void upperFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
1.266 + char *z1;
1.267 + const char *z2;
1.268 + int i, n;
1.269 + if( argc<1 || SQLITE_NULL==sqlite3_value_type(argv[0]) ) return;
1.270 + z2 = (char*)sqlite3_value_text(argv[0]);
1.271 + n = sqlite3_value_bytes(argv[0]);
1.272 + /* Verify that the call to _bytes() does not invalidate the _text() pointer */
1.273 + assert( z2==(char*)sqlite3_value_text(argv[0]) );
1.274 + if( z2 ){
1.275 + z1 = contextMalloc(context, ((i64)n)+1);
1.276 + if( z1 ){
1.277 + memcpy(z1, z2, n+1);
1.278 + for(i=0; z1[i]; i++){
1.279 + z1[i] = toupper(z1[i]);
1.280 + }
1.281 + sqlite3_result_text(context, z1, -1, sqlite3_free);
1.282 + }
1.283 + }
1.284 +}
1.285 +static void lowerFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
1.286 + char *z1;
1.287 + const char *z2;
1.288 + int i, n;
1.289 + if( argc<1 || SQLITE_NULL==sqlite3_value_type(argv[0]) ) return;
1.290 + z2 = (char*)sqlite3_value_text(argv[0]);
1.291 + n = sqlite3_value_bytes(argv[0]);
1.292 + /* Verify that the call to _bytes() does not invalidate the _text() pointer */
1.293 + assert( z2==(char*)sqlite3_value_text(argv[0]) );
1.294 + if( z2 ){
1.295 + z1 = contextMalloc(context, ((i64)n)+1);
1.296 + if( z1 ){
1.297 + memcpy(z1, z2, n+1);
1.298 + for(i=0; z1[i]; i++){
1.299 + z1[i] = tolower(z1[i]);
1.300 + }
1.301 + sqlite3_result_text(context, z1, -1, sqlite3_free);
1.302 + }
1.303 + }
1.304 +}
1.305 +
1.306 +/*
1.307 +** Implementation of the IFNULL(), NVL(), and COALESCE() functions.
1.308 +** All three do the same thing. They return the first non-NULL
1.309 +** argument.
1.310 +*/
1.311 +static void ifnullFunc(
1.312 + sqlite3_context *context,
1.313 + int argc,
1.314 + sqlite3_value **argv
1.315 +){
1.316 + int i;
1.317 + for(i=0; i<argc; i++){
1.318 + if( SQLITE_NULL!=sqlite3_value_type(argv[i]) ){
1.319 + sqlite3_result_value(context, argv[i]);
1.320 + break;
1.321 + }
1.322 + }
1.323 +}
1.324 +
1.325 +/*
1.326 +** Implementation of random(). Return a random integer.
1.327 +*/
1.328 +static void randomFunc(
1.329 + sqlite3_context *context,
1.330 + int argc,
1.331 + sqlite3_value **argv
1.332 +){
1.333 + sqlite_int64 r;
1.334 + sqlite3_randomness(sizeof(r), &r);
1.335 + if( (r<<1)==0 ) r = 0; /* Prevent 0x8000.... as the result so that we */
1.336 + /* can always do abs() of the result */
1.337 + sqlite3_result_int64(context, r);
1.338 +}
1.339 +
1.340 +/*
1.341 +** Implementation of randomblob(N). Return a random blob
1.342 +** that is N bytes long.
1.343 +*/
1.344 +static void randomBlob(
1.345 + sqlite3_context *context,
1.346 + int argc,
1.347 + sqlite3_value **argv
1.348 +){
1.349 + int n;
1.350 + unsigned char *p;
1.351 + assert( argc==1 );
1.352 + n = sqlite3_value_int(argv[0]);
1.353 + if( n<1 ){
1.354 + n = 1;
1.355 + }
1.356 + p = contextMalloc(context, n);
1.357 + if( p ){
1.358 + sqlite3_randomness(n, p);
1.359 + sqlite3_result_blob(context, (char*)p, n, sqlite3_free);
1.360 + }
1.361 +}
1.362 +
1.363 +/*
1.364 +** Implementation of the last_insert_rowid() SQL function. The return
1.365 +** value is the same as the sqlite3_last_insert_rowid() API function.
1.366 +*/
1.367 +static void last_insert_rowid(
1.368 + sqlite3_context *context,
1.369 + int arg,
1.370 + sqlite3_value **argv
1.371 +){
1.372 + sqlite3 *db = sqlite3_context_db_handle(context);
1.373 + sqlite3_result_int64(context, sqlite3_last_insert_rowid(db));
1.374 +}
1.375 +
1.376 +/*
1.377 +** Implementation of the changes() SQL function. The return value is the
1.378 +** same as the sqlite3_changes() API function.
1.379 +*/
1.380 +static void changes(
1.381 + sqlite3_context *context,
1.382 + int arg,
1.383 + sqlite3_value **argv
1.384 +){
1.385 + sqlite3 *db = sqlite3_context_db_handle(context);
1.386 + sqlite3_result_int(context, sqlite3_changes(db));
1.387 +}
1.388 +
1.389 +/*
1.390 +** Implementation of the total_changes() SQL function. The return value is
1.391 +** the same as the sqlite3_total_changes() API function.
1.392 +*/
1.393 +static void total_changes(
1.394 + sqlite3_context *context,
1.395 + int arg,
1.396 + sqlite3_value **argv
1.397 +){
1.398 + sqlite3 *db = sqlite3_context_db_handle(context);
1.399 + sqlite3_result_int(context, sqlite3_total_changes(db));
1.400 +}
1.401 +
1.402 +/*
1.403 +** A structure defining how to do GLOB-style comparisons.
1.404 +*/
1.405 +struct compareInfo {
1.406 + u8 matchAll;
1.407 + u8 matchOne;
1.408 + u8 matchSet;
1.409 + u8 noCase;
1.410 +};
1.411 +
1.412 +/*
1.413 +** For LIKE and GLOB matching on EBCDIC machines, assume that every
1.414 +** character is exactly one byte in size. Also, all characters are
1.415 +** able to participate in upper-case-to-lower-case mappings in EBCDIC
1.416 +** whereas only characters less than 0x80 do in ASCII.
1.417 +*/
1.418 +#if defined(SQLITE_EBCDIC)
1.419 +# define sqlite3Utf8Read(A,B,C) (*(A++))
1.420 +# define GlogUpperToLower(A) A = sqlite3UpperToLower[A]
1.421 +#else
1.422 +# define GlogUpperToLower(A) if( A<0x80 ){ A = sqlite3UpperToLower[A]; }
1.423 +#endif
1.424 +
1.425 +static const struct compareInfo globInfo = { '*', '?', '[', 0 };
1.426 +/* The correct SQL-92 behavior is for the LIKE operator to ignore
1.427 +** case. Thus 'a' LIKE 'A' would be true. */
1.428 +static const struct compareInfo likeInfoNorm = { '%', '_', 0, 1 };
1.429 +/* If SQLITE_CASE_SENSITIVE_LIKE is defined, then the LIKE operator
1.430 +** is case sensitive causing 'a' LIKE 'A' to be false */
1.431 +static const struct compareInfo likeInfoAlt = { '%', '_', 0, 0 };
1.432 +
1.433 +/*
1.434 +** Compare two UTF-8 strings for equality where the first string can
1.435 +** potentially be a "glob" expression. Return true (1) if they
1.436 +** are the same and false (0) if they are different.
1.437 +**
1.438 +** Globbing rules:
1.439 +**
1.440 +** '*' Matches any sequence of zero or more characters.
1.441 +**
1.442 +** '?' Matches exactly one character.
1.443 +**
1.444 +** [...] Matches one character from the enclosed list of
1.445 +** characters.
1.446 +**
1.447 +** [^...] Matches one character not in the enclosed list.
1.448 +**
1.449 +** With the [...] and [^...] matching, a ']' character can be included
1.450 +** in the list by making it the first character after '[' or '^'. A
1.451 +** range of characters can be specified using '-'. Example:
1.452 +** "[a-z]" matches any single lower-case letter. To match a '-', make
1.453 +** it the last character in the list.
1.454 +**
1.455 +** This routine is usually quick, but can be N**2 in the worst case.
1.456 +**
1.457 +** Hints: to match '*' or '?', put them in "[]". Like this:
1.458 +**
1.459 +** abc[*]xyz Matches "abc*xyz" only
1.460 +*/
1.461 +static int patternCompare(
1.462 + const u8 *zPattern, /* The glob pattern */
1.463 + const u8 *zString, /* The string to compare against the glob */
1.464 + const struct compareInfo *pInfo, /* Information about how to do the compare */
1.465 + const int esc /* The escape character */
1.466 +){
1.467 + int c, c2;
1.468 + int invert;
1.469 + int seen;
1.470 + u8 matchOne = pInfo->matchOne;
1.471 + u8 matchAll = pInfo->matchAll;
1.472 + u8 matchSet = pInfo->matchSet;
1.473 + u8 noCase = pInfo->noCase;
1.474 + int prevEscape = 0; /* True if the previous character was 'escape' */
1.475 +
1.476 + while( (c = sqlite3Utf8Read(zPattern,0,&zPattern))!=0 ){
1.477 + if( !prevEscape && c==matchAll ){
1.478 + while( (c=sqlite3Utf8Read(zPattern,0,&zPattern)) == matchAll
1.479 + || c == matchOne ){
1.480 + if( c==matchOne && sqlite3Utf8Read(zString, 0, &zString)==0 ){
1.481 + return 0;
1.482 + }
1.483 + }
1.484 + if( c==0 ){
1.485 + return 1;
1.486 + }else if( c==esc ){
1.487 + c = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.488 + if( c==0 ){
1.489 + return 0;
1.490 + }
1.491 + }else if( c==matchSet ){
1.492 + assert( esc==0 ); /* This is GLOB, not LIKE */
1.493 + assert( matchSet<0x80 ); /* '[' is a single-byte character */
1.494 + while( *zString && patternCompare(&zPattern[-1],zString,pInfo,esc)==0 ){
1.495 + SQLITE_SKIP_UTF8(zString);
1.496 + }
1.497 + return *zString!=0;
1.498 + }
1.499 + while( (c2 = sqlite3Utf8Read(zString,0,&zString))!=0 ){
1.500 + if( noCase ){
1.501 + GlogUpperToLower(c2);
1.502 + GlogUpperToLower(c);
1.503 + while( c2 != 0 && c2 != c ){
1.504 + c2 = sqlite3Utf8Read(zString, 0, &zString);
1.505 + GlogUpperToLower(c2);
1.506 + }
1.507 + }else{
1.508 + while( c2 != 0 && c2 != c ){
1.509 + c2 = sqlite3Utf8Read(zString, 0, &zString);
1.510 + }
1.511 + }
1.512 + if( c2==0 ) return 0;
1.513 + if( patternCompare(zPattern,zString,pInfo,esc) ) return 1;
1.514 + }
1.515 + return 0;
1.516 + }else if( !prevEscape && c==matchOne ){
1.517 + if( sqlite3Utf8Read(zString, 0, &zString)==0 ){
1.518 + return 0;
1.519 + }
1.520 + }else if( c==matchSet ){
1.521 + int prior_c = 0;
1.522 + assert( esc==0 ); /* This only occurs for GLOB, not LIKE */
1.523 + seen = 0;
1.524 + invert = 0;
1.525 + c = sqlite3Utf8Read(zString, 0, &zString);
1.526 + if( c==0 ) return 0;
1.527 + c2 = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.528 + if( c2=='^' ){
1.529 + invert = 1;
1.530 + c2 = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.531 + }
1.532 + if( c2==']' ){
1.533 + if( c==']' ) seen = 1;
1.534 + c2 = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.535 + }
1.536 + while( c2 && c2!=']' ){
1.537 + if( c2=='-' && zPattern[0]!=']' && zPattern[0]!=0 && prior_c>0 ){
1.538 + c2 = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.539 + if( c>=prior_c && c<=c2 ) seen = 1;
1.540 + prior_c = 0;
1.541 + }else{
1.542 + if( c==c2 ){
1.543 + seen = 1;
1.544 + }
1.545 + prior_c = c2;
1.546 + }
1.547 + c2 = sqlite3Utf8Read(zPattern, 0, &zPattern);
1.548 + }
1.549 + if( c2==0 || (seen ^ invert)==0 ){
1.550 + return 0;
1.551 + }
1.552 + }else if( esc==c && !prevEscape ){
1.553 + prevEscape = 1;
1.554 + }else{
1.555 + c2 = sqlite3Utf8Read(zString, 0, &zString);
1.556 + if( noCase ){
1.557 + GlogUpperToLower(c);
1.558 + GlogUpperToLower(c2);
1.559 + }
1.560 + if( c!=c2 ){
1.561 + return 0;
1.562 + }
1.563 + prevEscape = 0;
1.564 + }
1.565 + }
1.566 + return *zString==0;
1.567 +}
1.568 +
1.569 +/*
1.570 +** Count the number of times that the LIKE operator (or GLOB which is
1.571 +** just a variation of LIKE) gets called. This is used for testing
1.572 +** only.
1.573 +*/
1.574 +#ifdef SQLITE_TEST
1.575 +int sqlite3_like_count = 0;
1.576 +#endif
1.577 +
1.578 +
1.579 +/*
1.580 +** Implementation of the like() SQL function. This function implements
1.581 +** the build-in LIKE operator. The first argument to the function is the
1.582 +** pattern and the second argument is the string. So, the SQL statements:
1.583 +**
1.584 +** A LIKE B
1.585 +**
1.586 +** is implemented as like(B,A).
1.587 +**
1.588 +** This same function (with a different compareInfo structure) computes
1.589 +** the GLOB operator.
1.590 +*/
1.591 +void likeFunc(
1.592 + sqlite3_context *context,
1.593 + int argc,
1.594 + sqlite3_value **argv
1.595 +){
1.596 + const unsigned char *zA, *zB;
1.597 + int escape = 0;
1.598 + sqlite3 *db = sqlite3_context_db_handle(context);
1.599 +
1.600 + zB = sqlite3_value_text(argv[0]);
1.601 + zA = sqlite3_value_text(argv[1]);
1.602 +
1.603 + /* Limit the length of the LIKE or GLOB pattern to avoid problems
1.604 + ** of deep recursion and N*N behavior in patternCompare().
1.605 + */
1.606 + if( sqlite3_value_bytes(argv[0]) >
1.607 + db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] ){
1.608 + sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);
1.609 + return;
1.610 + }
1.611 + assert( zB==sqlite3_value_text(argv[0]) ); /* Encoding did not change */
1.612 +
1.613 + if( argc==3 ){
1.614 + /* The escape character string must consist of a single UTF-8 character.
1.615 + ** Otherwise, return an error.
1.616 + */
1.617 + const unsigned char *zEsc = sqlite3_value_text(argv[2]);
1.618 + if( zEsc==0 ) return;
1.619 + if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
1.620 + sqlite3_result_error(context,
1.621 + "ESCAPE expression must be a single character", -1);
1.622 + return;
1.623 + }
1.624 + escape = sqlite3Utf8Read(zEsc, 0, &zEsc);
1.625 + }
1.626 + if( zA && zB ){
1.627 + struct compareInfo *pInfo = sqlite3_user_data(context);
1.628 +#ifdef SQLITE_TEST
1.629 + sqlite3_like_count++;
1.630 +#endif
1.631 +
1.632 + sqlite3_result_int(context, patternCompare(zB, zA, pInfo, escape));
1.633 + }
1.634 +}
1.635 +
1.636 +/*
1.637 +** Implementation of the NULLIF(x,y) function. The result is the first
1.638 +** argument if the arguments are different. The result is NULL if the
1.639 +** arguments are equal to each other.
1.640 +*/
1.641 +static void nullifFunc(
1.642 + sqlite3_context *context,
1.643 + int argc,
1.644 + sqlite3_value **argv
1.645 +){
1.646 + CollSeq *pColl = sqlite3GetFuncCollSeq(context);
1.647 + if( sqlite3MemCompare(argv[0], argv[1], pColl)!=0 ){
1.648 + sqlite3_result_value(context, argv[0]);
1.649 + }
1.650 +}
1.651 +
1.652 +/*
1.653 +** Implementation of the VERSION(*) function. The result is the version
1.654 +** of the SQLite library that is running.
1.655 +*/
1.656 +static void versionFunc(
1.657 + sqlite3_context *context,
1.658 + int argc,
1.659 + sqlite3_value **argv
1.660 +){
1.661 + sqlite3_result_text(context, sqlite3_version, -1, SQLITE_STATIC);
1.662 +}
1.663 +
1.664 +/* Array for converting from half-bytes (nybbles) into ASCII hex
1.665 +** digits. */
1.666 +static const char hexdigits[] = {
1.667 + '0', '1', '2', '3', '4', '5', '6', '7',
1.668 + '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
1.669 +};
1.670 +
1.671 +/*
1.672 +** EXPERIMENTAL - This is not an official function. The interface may
1.673 +** change. This function may disappear. Do not write code that depends
1.674 +** on this function.
1.675 +**
1.676 +** Implementation of the QUOTE() function. This function takes a single
1.677 +** argument. If the argument is numeric, the return value is the same as
1.678 +** the argument. If the argument is NULL, the return value is the string
1.679 +** "NULL". Otherwise, the argument is enclosed in single quotes with
1.680 +** single-quote escapes.
1.681 +*/
1.682 +static void quoteFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
1.683 + if( argc<1 ) return;
1.684 + switch( sqlite3_value_type(argv[0]) ){
1.685 + case SQLITE_NULL: {
1.686 + sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
1.687 + break;
1.688 + }
1.689 + case SQLITE_INTEGER:
1.690 + case SQLITE_FLOAT: {
1.691 + sqlite3_result_value(context, argv[0]);
1.692 + break;
1.693 + }
1.694 + case SQLITE_BLOB: {
1.695 + char *zText = 0;
1.696 + char const *zBlob = sqlite3_value_blob(argv[0]);
1.697 + int nBlob = sqlite3_value_bytes(argv[0]);
1.698 + assert( zBlob==sqlite3_value_blob(argv[0]) ); /* No encoding change */
1.699 + zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4);
1.700 + if( zText ){
1.701 + int i;
1.702 + for(i=0; i<nBlob; i++){
1.703 + zText[(i*2)+2] = hexdigits[(zBlob[i]>>4)&0x0F];
1.704 + zText[(i*2)+3] = hexdigits[(zBlob[i])&0x0F];
1.705 + }
1.706 + zText[(nBlob*2)+2] = '\'';
1.707 + zText[(nBlob*2)+3] = '\0';
1.708 + zText[0] = 'X';
1.709 + zText[1] = '\'';
1.710 + sqlite3_result_text(context, zText, -1, SQLITE_TRANSIENT);
1.711 + sqlite3_free(zText);
1.712 + }
1.713 + break;
1.714 + }
1.715 + case SQLITE_TEXT: {
1.716 + int i,j;
1.717 + u64 n;
1.718 + const unsigned char *zArg = sqlite3_value_text(argv[0]);
1.719 + char *z;
1.720 +
1.721 + if( zArg==0 ) return;
1.722 + for(i=0, n=0; zArg[i]; i++){ if( zArg[i]=='\'' ) n++; }
1.723 + z = contextMalloc(context, ((i64)i)+((i64)n)+3);
1.724 + if( z ){
1.725 + z[0] = '\'';
1.726 + for(i=0, j=1; zArg[i]; i++){
1.727 + z[j++] = zArg[i];
1.728 + if( zArg[i]=='\'' ){
1.729 + z[j++] = '\'';
1.730 + }
1.731 + }
1.732 + z[j++] = '\'';
1.733 + z[j] = 0;
1.734 + sqlite3_result_text(context, z, j, sqlite3_free);
1.735 + }
1.736 + }
1.737 + }
1.738 +}
1.739 +
1.740 +/*
1.741 +** The hex() function. Interpret the argument as a blob. Return
1.742 +** a hexadecimal rendering as text.
1.743 +*/
1.744 +static void hexFunc(
1.745 + sqlite3_context *context,
1.746 + int argc,
1.747 + sqlite3_value **argv
1.748 +){
1.749 + int i, n;
1.750 + const unsigned char *pBlob;
1.751 + char *zHex, *z;
1.752 + assert( argc==1 );
1.753 + pBlob = sqlite3_value_blob(argv[0]);
1.754 + n = sqlite3_value_bytes(argv[0]);
1.755 + assert( pBlob==sqlite3_value_blob(argv[0]) ); /* No encoding change */
1.756 + z = zHex = contextMalloc(context, ((i64)n)*2 + 1);
1.757 + if( zHex ){
1.758 + for(i=0; i<n; i++, pBlob++){
1.759 + unsigned char c = *pBlob;
1.760 + *(z++) = hexdigits[(c>>4)&0xf];
1.761 + *(z++) = hexdigits[c&0xf];
1.762 + }
1.763 + *z = 0;
1.764 + sqlite3_result_text(context, zHex, n*2, sqlite3_free);
1.765 + }
1.766 +}
1.767 +
1.768 +/*
1.769 +** The zeroblob(N) function returns a zero-filled blob of size N bytes.
1.770 +*/
1.771 +static void zeroblobFunc(
1.772 + sqlite3_context *context,
1.773 + int argc,
1.774 + sqlite3_value **argv
1.775 +){
1.776 + i64 n;
1.777 + assert( argc==1 );
1.778 + n = sqlite3_value_int64(argv[0]);
1.779 + if( n>SQLITE_MAX_LENGTH ){
1.780 + sqlite3_result_error_toobig(context);
1.781 + }else{
1.782 + sqlite3_result_zeroblob(context, n);
1.783 + }
1.784 +}
1.785 +
1.786 +/*
1.787 +** The replace() function. Three arguments are all strings: call
1.788 +** them A, B, and C. The result is also a string which is derived
1.789 +** from A by replacing every occurance of B with C. The match
1.790 +** must be exact. Collating sequences are not used.
1.791 +*/
1.792 +static void replaceFunc(
1.793 + sqlite3_context *context,
1.794 + int argc,
1.795 + sqlite3_value **argv
1.796 +){
1.797 + const unsigned char *zStr; /* The input string A */
1.798 + const unsigned char *zPattern; /* The pattern string B */
1.799 + const unsigned char *zRep; /* The replacement string C */
1.800 + unsigned char *zOut; /* The output */
1.801 + int nStr; /* Size of zStr */
1.802 + int nPattern; /* Size of zPattern */
1.803 + int nRep; /* Size of zRep */
1.804 + i64 nOut; /* Maximum size of zOut */
1.805 + int loopLimit; /* Last zStr[] that might match zPattern[] */
1.806 + int i, j; /* Loop counters */
1.807 +
1.808 + assert( argc==3 );
1.809 + zStr = sqlite3_value_text(argv[0]);
1.810 + if( zStr==0 ) return;
1.811 + nStr = sqlite3_value_bytes(argv[0]);
1.812 + assert( zStr==sqlite3_value_text(argv[0]) ); /* No encoding change */
1.813 + zPattern = sqlite3_value_text(argv[1]);
1.814 + if( zPattern==0 || zPattern[0]==0 ) return;
1.815 + nPattern = sqlite3_value_bytes(argv[1]);
1.816 + assert( zPattern==sqlite3_value_text(argv[1]) ); /* No encoding change */
1.817 + zRep = sqlite3_value_text(argv[2]);
1.818 + if( zRep==0 ) return;
1.819 + nRep = sqlite3_value_bytes(argv[2]);
1.820 + assert( zRep==sqlite3_value_text(argv[2]) );
1.821 + nOut = nStr + 1;
1.822 + assert( nOut<SQLITE_MAX_LENGTH );
1.823 + zOut = contextMalloc(context, (i64)nOut);
1.824 + if( zOut==0 ){
1.825 + return;
1.826 + }
1.827 + loopLimit = nStr - nPattern;
1.828 + for(i=j=0; i<=loopLimit; i++){
1.829 + if( zStr[i]!=zPattern[0] || memcmp(&zStr[i], zPattern, nPattern) ){
1.830 + zOut[j++] = zStr[i];
1.831 + }else{
1.832 + u8 *zOld;
1.833 + sqlite3 *db = sqlite3_context_db_handle(context);
1.834 + nOut += nRep - nPattern;
1.835 + if( nOut>=db->aLimit[SQLITE_LIMIT_LENGTH] ){
1.836 + sqlite3_result_error_toobig(context);
1.837 + sqlite3DbFree(db, zOut);
1.838 + return;
1.839 + }
1.840 + zOld = zOut;
1.841 + zOut = sqlite3_realloc(zOut, (int)nOut);
1.842 + if( zOut==0 ){
1.843 + sqlite3_result_error_nomem(context);
1.844 + sqlite3DbFree(db, zOld);
1.845 + return;
1.846 + }
1.847 + memcpy(&zOut[j], zRep, nRep);
1.848 + j += nRep;
1.849 + i += nPattern-1;
1.850 + }
1.851 + }
1.852 + assert( j+nStr-i+1==nOut );
1.853 + memcpy(&zOut[j], &zStr[i], nStr-i);
1.854 + j += nStr - i;
1.855 + assert( j<=nOut );
1.856 + zOut[j] = 0;
1.857 + sqlite3_result_text(context, (char*)zOut, j, sqlite3_free);
1.858 +}
1.859 +
1.860 +/*
1.861 +** Implementation of the TRIM(), LTRIM(), and RTRIM() functions.
1.862 +** The userdata is 0x1 for left trim, 0x2 for right trim, 0x3 for both.
1.863 +*/
1.864 +static void trimFunc(
1.865 + sqlite3_context *context,
1.866 + int argc,
1.867 + sqlite3_value **argv
1.868 +){
1.869 + const unsigned char *zIn; /* Input string */
1.870 + const unsigned char *zCharSet; /* Set of characters to trim */
1.871 + int nIn; /* Number of bytes in input */
1.872 + int flags; /* 1: trimleft 2: trimright 3: trim */
1.873 + int i; /* Loop counter */
1.874 + unsigned char *aLen; /* Length of each character in zCharSet */
1.875 + unsigned char **azChar; /* Individual characters in zCharSet */
1.876 + int nChar; /* Number of characters in zCharSet */
1.877 +
1.878 + if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
1.879 + return;
1.880 + }
1.881 + zIn = sqlite3_value_text(argv[0]);
1.882 + if( zIn==0 ) return;
1.883 + nIn = sqlite3_value_bytes(argv[0]);
1.884 + assert( zIn==sqlite3_value_text(argv[0]) );
1.885 + if( argc==1 ){
1.886 + static const unsigned char lenOne[] = { 1 };
1.887 + static unsigned char * const azOne[] = { (u8*)" " };
1.888 + nChar = 1;
1.889 + aLen = (u8*)lenOne;
1.890 + azChar = (unsigned char **)azOne;
1.891 + zCharSet = 0;
1.892 + }else if( (zCharSet = sqlite3_value_text(argv[1]))==0 ){
1.893 + return;
1.894 + }else{
1.895 + const unsigned char *z;
1.896 + for(z=zCharSet, nChar=0; *z; nChar++){
1.897 + SQLITE_SKIP_UTF8(z);
1.898 + }
1.899 + if( nChar>0 ){
1.900 + azChar = contextMalloc(context, ((i64)nChar)*(sizeof(char*)+1));
1.901 + if( azChar==0 ){
1.902 + return;
1.903 + }
1.904 + aLen = (unsigned char*)&azChar[nChar];
1.905 + for(z=zCharSet, nChar=0; *z; nChar++){
1.906 + azChar[nChar] = (unsigned char *)z;
1.907 + SQLITE_SKIP_UTF8(z);
1.908 + aLen[nChar] = z - azChar[nChar];
1.909 + }
1.910 + }
1.911 + }
1.912 + if( nChar>0 ){
1.913 + flags = SQLITE_PTR_TO_INT(sqlite3_user_data(context));
1.914 + if( flags & 1 ){
1.915 + while( nIn>0 ){
1.916 + int len;
1.917 + for(i=0; i<nChar; i++){
1.918 + len = aLen[i];
1.919 + if( memcmp(zIn, azChar[i], len)==0 ) break;
1.920 + }
1.921 + if( i>=nChar ) break;
1.922 + zIn += len;
1.923 + nIn -= len;
1.924 + }
1.925 + }
1.926 + if( flags & 2 ){
1.927 + while( nIn>0 ){
1.928 + int len;
1.929 + for(i=0; i<nChar; i++){
1.930 + len = aLen[i];
1.931 + if( len<=nIn && memcmp(&zIn[nIn-len],azChar[i],len)==0 ) break;
1.932 + }
1.933 + if( i>=nChar ) break;
1.934 + nIn -= len;
1.935 + }
1.936 + }
1.937 + if( zCharSet ){
1.938 + sqlite3_free(azChar);
1.939 + }
1.940 + }
1.941 + sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);
1.942 +}
1.943 +
1.944 +
1.945 +#ifdef SQLITE_SOUNDEX
1.946 +/*
1.947 +** Compute the soundex encoding of a word.
1.948 +*/
1.949 +static void soundexFunc(
1.950 + sqlite3_context *context,
1.951 + int argc,
1.952 + sqlite3_value **argv
1.953 +){
1.954 + char zResult[8];
1.955 + const u8 *zIn;
1.956 + int i, j;
1.957 + static const unsigned char iCode[] = {
1.958 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.959 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.960 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.961 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.962 + 0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
1.963 + 1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
1.964 + 0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
1.965 + 1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
1.966 + };
1.967 + assert( argc==1 );
1.968 + zIn = (u8*)sqlite3_value_text(argv[0]);
1.969 + if( zIn==0 ) zIn = (u8*)"";
1.970 + for(i=0; zIn[i] && !isalpha(zIn[i]); i++){}
1.971 + if( zIn[i] ){
1.972 + u8 prevcode = iCode[zIn[i]&0x7f];
1.973 + zResult[0] = toupper(zIn[i]);
1.974 + for(j=1; j<4 && zIn[i]; i++){
1.975 + int code = iCode[zIn[i]&0x7f];
1.976 + if( code>0 ){
1.977 + if( code!=prevcode ){
1.978 + prevcode = code;
1.979 + zResult[j++] = code + '0';
1.980 + }
1.981 + }else{
1.982 + prevcode = 0;
1.983 + }
1.984 + }
1.985 + while( j<4 ){
1.986 + zResult[j++] = '0';
1.987 + }
1.988 + zResult[j] = 0;
1.989 + sqlite3_result_text(context, zResult, 4, SQLITE_TRANSIENT);
1.990 + }else{
1.991 + sqlite3_result_text(context, "?000", 4, SQLITE_STATIC);
1.992 + }
1.993 +}
1.994 +#endif
1.995 +
1.996 +#ifndef SQLITE_OMIT_LOAD_EXTENSION
1.997 +/*
1.998 +** A function that loads a shared-library extension then returns NULL.
1.999 +*/
1.1000 +static void loadExt(sqlite3_context *context, int argc, sqlite3_value **argv){
1.1001 + const char *zFile = (const char *)sqlite3_value_text(argv[0]);
1.1002 + const char *zProc;
1.1003 + sqlite3 *db = sqlite3_context_db_handle(context);
1.1004 + char *zErrMsg = 0;
1.1005 +
1.1006 + if( argc==2 ){
1.1007 + zProc = (const char *)sqlite3_value_text(argv[1]);
1.1008 + }else{
1.1009 + zProc = 0;
1.1010 + }
1.1011 + if( zFile && sqlite3_load_extension(db, zFile, zProc, &zErrMsg) ){
1.1012 + sqlite3_result_error(context, zErrMsg, -1);
1.1013 + sqlite3_free(zErrMsg);
1.1014 + }
1.1015 +}
1.1016 +#endif
1.1017 +
1.1018 +
1.1019 +/*
1.1020 +** An instance of the following structure holds the context of a
1.1021 +** sum() or avg() aggregate computation.
1.1022 +*/
1.1023 +typedef struct SumCtx SumCtx;
1.1024 +struct SumCtx {
1.1025 + double rSum; /* Floating point sum */
1.1026 + i64 iSum; /* Integer sum */
1.1027 + i64 cnt; /* Number of elements summed */
1.1028 + u8 overflow; /* True if integer overflow seen */
1.1029 + u8 approx; /* True if non-integer value was input to the sum */
1.1030 +};
1.1031 +
1.1032 +/*
1.1033 +** Routines used to compute the sum, average, and total.
1.1034 +**
1.1035 +** The SUM() function follows the (broken) SQL standard which means
1.1036 +** that it returns NULL if it sums over no inputs. TOTAL returns
1.1037 +** 0.0 in that case. In addition, TOTAL always returns a float where
1.1038 +** SUM might return an integer if it never encounters a floating point
1.1039 +** value. TOTAL never fails, but SUM might through an exception if
1.1040 +** it overflows an integer.
1.1041 +*/
1.1042 +static void sumStep(sqlite3_context *context, int argc, sqlite3_value **argv){
1.1043 + SumCtx *p;
1.1044 + int type;
1.1045 + assert( argc==1 );
1.1046 + p = sqlite3_aggregate_context(context, sizeof(*p));
1.1047 + type = sqlite3_value_numeric_type(argv[0]);
1.1048 + if( p && type!=SQLITE_NULL ){
1.1049 + p->cnt++;
1.1050 + if( type==SQLITE_INTEGER ){
1.1051 + i64 v = sqlite3_value_int64(argv[0]);
1.1052 + p->rSum += v;
1.1053 + if( (p->approx|p->overflow)==0 ){
1.1054 + i64 iNewSum = p->iSum + v;
1.1055 + int s1 = p->iSum >> (sizeof(i64)*8-1);
1.1056 + int s2 = v >> (sizeof(i64)*8-1);
1.1057 + int s3 = iNewSum >> (sizeof(i64)*8-1);
1.1058 + p->overflow = (s1&s2&~s3) | (~s1&~s2&s3);
1.1059 + p->iSum = iNewSum;
1.1060 + }
1.1061 + }else{
1.1062 + p->rSum += sqlite3_value_double(argv[0]);
1.1063 + p->approx = 1;
1.1064 + }
1.1065 + }
1.1066 +}
1.1067 +static void sumFinalize(sqlite3_context *context){
1.1068 + SumCtx *p;
1.1069 + p = sqlite3_aggregate_context(context, 0);
1.1070 + if( p && p->cnt>0 ){
1.1071 + if( p->overflow ){
1.1072 + sqlite3_result_error(context,"integer overflow",-1);
1.1073 + }else if( p->approx ){
1.1074 + sqlite3_result_double(context, p->rSum);
1.1075 + }else{
1.1076 + sqlite3_result_int64(context, p->iSum);
1.1077 + }
1.1078 + }
1.1079 +}
1.1080 +static void avgFinalize(sqlite3_context *context){
1.1081 + SumCtx *p;
1.1082 + p = sqlite3_aggregate_context(context, 0);
1.1083 + if( p && p->cnt>0 ){
1.1084 + sqlite3_result_double(context, p->rSum/(double)p->cnt);
1.1085 + }
1.1086 +}
1.1087 +static void totalFinalize(sqlite3_context *context){
1.1088 + SumCtx *p;
1.1089 + p = sqlite3_aggregate_context(context, 0);
1.1090 + sqlite3_result_double(context, p ? p->rSum : 0.0);
1.1091 +}
1.1092 +
1.1093 +/*
1.1094 +** The following structure keeps track of state information for the
1.1095 +** count() aggregate function.
1.1096 +*/
1.1097 +typedef struct CountCtx CountCtx;
1.1098 +struct CountCtx {
1.1099 + i64 n;
1.1100 +};
1.1101 +
1.1102 +/*
1.1103 +** Routines to implement the count() aggregate function.
1.1104 +*/
1.1105 +static void countStep(sqlite3_context *context, int argc, sqlite3_value **argv){
1.1106 + CountCtx *p;
1.1107 + p = sqlite3_aggregate_context(context, sizeof(*p));
1.1108 + if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0])) && p ){
1.1109 + p->n++;
1.1110 + }
1.1111 +}
1.1112 +static void countFinalize(sqlite3_context *context){
1.1113 + CountCtx *p;
1.1114 + p = sqlite3_aggregate_context(context, 0);
1.1115 + sqlite3_result_int64(context, p ? p->n : 0);
1.1116 +}
1.1117 +
1.1118 +/*
1.1119 +** Routines to implement min() and max() aggregate functions.
1.1120 +*/
1.1121 +static void minmaxStep(sqlite3_context *context, int argc, sqlite3_value **argv){
1.1122 + Mem *pArg = (Mem *)argv[0];
1.1123 + Mem *pBest;
1.1124 +
1.1125 + if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
1.1126 + pBest = (Mem *)sqlite3_aggregate_context(context, sizeof(*pBest));
1.1127 + if( !pBest ) return;
1.1128 +
1.1129 + if( pBest->flags ){
1.1130 + int max;
1.1131 + int cmp;
1.1132 + CollSeq *pColl = sqlite3GetFuncCollSeq(context);
1.1133 + /* This step function is used for both the min() and max() aggregates,
1.1134 + ** the only difference between the two being that the sense of the
1.1135 + ** comparison is inverted. For the max() aggregate, the
1.1136 + ** sqlite3_user_data() function returns (void *)-1. For min() it
1.1137 + ** returns (void *)db, where db is the sqlite3* database pointer.
1.1138 + ** Therefore the next statement sets variable 'max' to 1 for the max()
1.1139 + ** aggregate, or 0 for min().
1.1140 + */
1.1141 + max = sqlite3_user_data(context)!=0;
1.1142 + cmp = sqlite3MemCompare(pBest, pArg, pColl);
1.1143 + if( (max && cmp<0) || (!max && cmp>0) ){
1.1144 + sqlite3VdbeMemCopy(pBest, pArg);
1.1145 + }
1.1146 + }else{
1.1147 + sqlite3VdbeMemCopy(pBest, pArg);
1.1148 + }
1.1149 +}
1.1150 +static void minMaxFinalize(sqlite3_context *context){
1.1151 + sqlite3_value *pRes;
1.1152 + pRes = (sqlite3_value *)sqlite3_aggregate_context(context, 0);
1.1153 + if( pRes ){
1.1154 + if( pRes->flags ){
1.1155 + sqlite3_result_value(context, pRes);
1.1156 + }
1.1157 + sqlite3VdbeMemRelease(pRes);
1.1158 + }
1.1159 +}
1.1160 +
1.1161 +/*
1.1162 +** group_concat(EXPR, ?SEPARATOR?)
1.1163 +*/
1.1164 +static void groupConcatStep(
1.1165 + sqlite3_context *context,
1.1166 + int argc,
1.1167 + sqlite3_value **argv
1.1168 +){
1.1169 + const char *zVal;
1.1170 + StrAccum *pAccum;
1.1171 + const char *zSep;
1.1172 + int nVal, nSep, i;
1.1173 + if( argc==0 || sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
1.1174 + pAccum = (StrAccum*)sqlite3_aggregate_context(context, sizeof(*pAccum));
1.1175 +
1.1176 + if( pAccum ){
1.1177 + sqlite3 *db = sqlite3_context_db_handle(context);
1.1178 + pAccum->useMalloc = 1;
1.1179 + pAccum->mxAlloc = db->aLimit[SQLITE_LIMIT_LENGTH];
1.1180 + if( pAccum->nChar ){
1.1181 + if( argc>1 ){
1.1182 + zSep = (char*)sqlite3_value_text(argv[argc-1]);
1.1183 + nSep = sqlite3_value_bytes(argv[argc-1]);
1.1184 + }else{
1.1185 + zSep = ",";
1.1186 + nSep = 1;
1.1187 + }
1.1188 + sqlite3StrAccumAppend(pAccum, zSep, nSep);
1.1189 + }
1.1190 + i = 0;
1.1191 + do{
1.1192 + zVal = (char*)sqlite3_value_text(argv[i]);
1.1193 + nVal = sqlite3_value_bytes(argv[i]);
1.1194 + sqlite3StrAccumAppend(pAccum, zVal, nVal);
1.1195 + i++;
1.1196 + }while( i<argc-1 );
1.1197 + }
1.1198 +}
1.1199 +static void groupConcatFinalize(sqlite3_context *context){
1.1200 + StrAccum *pAccum;
1.1201 + pAccum = sqlite3_aggregate_context(context, 0);
1.1202 + if( pAccum ){
1.1203 + if( pAccum->tooBig ){
1.1204 + sqlite3_result_error_toobig(context);
1.1205 + }else if( pAccum->mallocFailed ){
1.1206 + sqlite3_result_error_nomem(context);
1.1207 + }else{
1.1208 + sqlite3_result_text(context, sqlite3StrAccumFinish(pAccum), -1,
1.1209 + sqlite3_free);
1.1210 + }
1.1211 + }
1.1212 +}
1.1213 +
1.1214 +/*
1.1215 +** This function registered all of the above C functions as SQL
1.1216 +** functions. This should be the only routine in this file with
1.1217 +** external linkage.
1.1218 +*/
1.1219 +void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
1.1220 +#ifndef SQLITE_OMIT_ALTERTABLE
1.1221 + sqlite3AlterFunctions(db);
1.1222 +#endif
1.1223 +#ifndef SQLITE_OMIT_PARSER
1.1224 + sqlite3AttachFunctions(db);
1.1225 +#endif
1.1226 + if( !db->mallocFailed ){
1.1227 + int rc = sqlite3_overload_function(db, "MATCH", 2);
1.1228 + assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
1.1229 + if( rc==SQLITE_NOMEM ){
1.1230 + db->mallocFailed = 1;
1.1231 + }
1.1232 + }
1.1233 +#ifdef SQLITE_SSE
1.1234 + (void)sqlite3SseFunctions(db);
1.1235 +#endif
1.1236 +}
1.1237 +
1.1238 +/*
1.1239 +** Set the LIKEOPT flag on the 2-argument function with the given name.
1.1240 +*/
1.1241 +static void setLikeOptFlag(sqlite3 *db, const char *zName, int flagVal){
1.1242 + FuncDef *pDef;
1.1243 + pDef = sqlite3FindFunction(db, zName, strlen(zName), 2, SQLITE_UTF8, 0);
1.1244 + if( pDef ){
1.1245 + pDef->flags = flagVal;
1.1246 + }
1.1247 +}
1.1248 +
1.1249 +/*
1.1250 +** Register the built-in LIKE and GLOB functions. The caseSensitive
1.1251 +** parameter determines whether or not the LIKE operator is case
1.1252 +** sensitive. GLOB is always case sensitive.
1.1253 +*/
1.1254 +void sqlite3RegisterLikeFunctions(sqlite3 *db, int caseSensitive){
1.1255 + struct compareInfo *pInfo;
1.1256 + if( caseSensitive ){
1.1257 + pInfo = (struct compareInfo*)&likeInfoAlt;
1.1258 + }else{
1.1259 + pInfo = (struct compareInfo*)&likeInfoNorm;
1.1260 + }
1.1261 + sqlite3CreateFunc(db, "like", 2, SQLITE_UTF8, pInfo, likeFunc, 0, 0);
1.1262 + sqlite3CreateFunc(db, "like", 3, SQLITE_UTF8, pInfo, likeFunc, 0, 0);
1.1263 + sqlite3CreateFunc(db, "glob", 2, SQLITE_UTF8,
1.1264 + (struct compareInfo*)&globInfo, likeFunc, 0,0);
1.1265 + setLikeOptFlag(db, "glob", SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE);
1.1266 + setLikeOptFlag(db, "like",
1.1267 + caseSensitive ? (SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE) : SQLITE_FUNC_LIKE);
1.1268 +}
1.1269 +
1.1270 +/*
1.1271 +** pExpr points to an expression which implements a function. If
1.1272 +** it is appropriate to apply the LIKE optimization to that function
1.1273 +** then set aWc[0] through aWc[2] to the wildcard characters and
1.1274 +** return TRUE. If the function is not a LIKE-style function then
1.1275 +** return FALSE.
1.1276 +*/
1.1277 +int sqlite3IsLikeFunction(sqlite3 *db, Expr *pExpr, int *pIsNocase, char *aWc){
1.1278 + FuncDef *pDef;
1.1279 + if( pExpr->op!=TK_FUNCTION || !pExpr->pList ){
1.1280 + return 0;
1.1281 + }
1.1282 + if( pExpr->pList->nExpr!=2 ){
1.1283 + return 0;
1.1284 + }
1.1285 + pDef = sqlite3FindFunction(db, (char*)pExpr->token.z, pExpr->token.n, 2,
1.1286 + SQLITE_UTF8, 0);
1.1287 + if( pDef==0 || (pDef->flags & SQLITE_FUNC_LIKE)==0 ){
1.1288 + return 0;
1.1289 + }
1.1290 +
1.1291 + /* The memcpy() statement assumes that the wildcard characters are
1.1292 + ** the first three statements in the compareInfo structure. The
1.1293 + ** asserts() that follow verify that assumption
1.1294 + */
1.1295 + memcpy(aWc, pDef->pUserData, 3);
1.1296 + assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
1.1297 + assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
1.1298 + assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );
1.1299 + *pIsNocase = (pDef->flags & SQLITE_FUNC_CASE)==0;
1.1300 + return 1;
1.1301 +}
1.1302 +
1.1303 +/*
1.1304 +** All all of the FuncDef structures in the aBuiltinFunc[] array above
1.1305 +** to the global function hash table. This occurs at start-time (as
1.1306 +** a consequence of calling sqlite3_initialize()).
1.1307 +**
1.1308 +** After this routine runs
1.1309 +*/
1.1310 +void sqlite3RegisterGlobalFunctions(void){
1.1311 + /*
1.1312 + ** The following array holds FuncDef structures for all of the functions
1.1313 + ** defined in this file.
1.1314 + **
1.1315 + ** The array cannot be constant since changes are made to the
1.1316 + ** FuncDef.pHash elements at start-time. The elements of this array
1.1317 + ** are read-only after initialization is complete.
1.1318 + */
1.1319 + static SQLITE_WSD FuncDef aBuiltinFunc[] = {
1.1320 + FUNCTION(ltrim, 1, 1, 0, trimFunc ),
1.1321 + FUNCTION(ltrim, 2, 1, 0, trimFunc ),
1.1322 + FUNCTION(rtrim, 1, 2, 0, trimFunc ),
1.1323 + FUNCTION(rtrim, 2, 2, 0, trimFunc ),
1.1324 + FUNCTION(trim, 1, 3, 0, trimFunc ),
1.1325 + FUNCTION(trim, 2, 3, 0, trimFunc ),
1.1326 + FUNCTION(min, -1, 0, 1, minmaxFunc ),
1.1327 + FUNCTION(min, 0, 0, 1, 0 ),
1.1328 + AGGREGATE(min, 1, 0, 1, minmaxStep, minMaxFinalize ),
1.1329 + FUNCTION(max, -1, 1, 1, minmaxFunc ),
1.1330 + FUNCTION(max, 0, 1, 1, 0 ),
1.1331 + AGGREGATE(max, 1, 1, 1, minmaxStep, minMaxFinalize ),
1.1332 + FUNCTION(typeof, 1, 0, 0, typeofFunc ),
1.1333 + FUNCTION(length, 1, 0, 0, lengthFunc ),
1.1334 + FUNCTION(substr, 2, 0, 0, substrFunc ),
1.1335 + FUNCTION(substr, 3, 0, 0, substrFunc ),
1.1336 + FUNCTION(abs, 1, 0, 0, absFunc ),
1.1337 + FUNCTION(round, 1, 0, 0, roundFunc ),
1.1338 + FUNCTION(round, 2, 0, 0, roundFunc ),
1.1339 + FUNCTION(upper, 1, 0, 0, upperFunc ),
1.1340 + FUNCTION(lower, 1, 0, 0, lowerFunc ),
1.1341 + FUNCTION(coalesce, 1, 0, 0, 0 ),
1.1342 + FUNCTION(coalesce, -1, 0, 0, ifnullFunc ),
1.1343 + FUNCTION(coalesce, 0, 0, 0, 0 ),
1.1344 + FUNCTION(hex, 1, 0, 0, hexFunc ),
1.1345 + FUNCTION(ifnull, 2, 0, 1, ifnullFunc ),
1.1346 + FUNCTION(random, -1, 0, 0, randomFunc ),
1.1347 + FUNCTION(randomblob, 1, 0, 0, randomBlob ),
1.1348 + FUNCTION(nullif, 2, 0, 1, nullifFunc ),
1.1349 + FUNCTION(sqlite_version, 0, 0, 0, versionFunc ),
1.1350 + FUNCTION(quote, 1, 0, 0, quoteFunc ),
1.1351 + FUNCTION(last_insert_rowid, 0, 0, 0, last_insert_rowid),
1.1352 + FUNCTION(changes, 0, 0, 0, changes ),
1.1353 + FUNCTION(total_changes, 0, 0, 0, total_changes ),
1.1354 + FUNCTION(replace, 3, 0, 0, replaceFunc ),
1.1355 + FUNCTION(zeroblob, 1, 0, 0, zeroblobFunc ),
1.1356 + #ifdef SQLITE_SOUNDEX
1.1357 + FUNCTION(soundex, 1, 0, 0, soundexFunc ),
1.1358 + #endif
1.1359 + #ifndef SQLITE_OMIT_LOAD_EXTENSION
1.1360 + FUNCTION(load_extension, 1, 0, 0, loadExt ),
1.1361 + FUNCTION(load_extension, 2, 0, 0, loadExt ),
1.1362 + #endif
1.1363 + AGGREGATE(sum, 1, 0, 0, sumStep, sumFinalize ),
1.1364 + AGGREGATE(total, 1, 0, 0, sumStep, totalFinalize ),
1.1365 + AGGREGATE(avg, 1, 0, 0, sumStep, avgFinalize ),
1.1366 + AGGREGATE(count, 0, 0, 0, countStep, countFinalize ),
1.1367 + AGGREGATE(count, 1, 0, 0, countStep, countFinalize ),
1.1368 + AGGREGATE(group_concat, -1, 0, 0, groupConcatStep, groupConcatFinalize),
1.1369 +
1.1370 + LIKEFUNC(glob, 2, &globInfo, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
1.1371 + #ifdef SQLITE_CASE_SENSITIVE_LIKE
1.1372 + LIKEFUNC(like, 2, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
1.1373 + LIKEFUNC(like, 3, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
1.1374 + #else
1.1375 + LIKEFUNC(like, 2, &likeInfoNorm, SQLITE_FUNC_LIKE),
1.1376 + LIKEFUNC(like, 3, &likeInfoNorm, SQLITE_FUNC_LIKE),
1.1377 + #endif
1.1378 + };
1.1379 +
1.1380 + int i;
1.1381 + FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
1.1382 + FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aBuiltinFunc);
1.1383 +
1.1384 + for(i=0; i<ArraySize(aBuiltinFunc); i++){
1.1385 + sqlite3FuncDefInsert(pHash, &aFunc[i]);
1.1386 + }
1.1387 + sqlite3RegisterDateTimeFunctions();
1.1388 +}
1.1389 +
1.1390 +int sqlite3RegisterInternalUtf8Like(sqlite3 *db){
1.1391 + int rc;
1.1392 + void *pCtx = (void *)&likeInfoNorm;
1.1393 + rc = sqlite3_create_function(db, "like", 2, SQLITE_UTF8, pCtx, likeFunc, 0, 0);
1.1394 + if( rc!=SQLITE_OK ) return rc;
1.1395 + rc = sqlite3_create_function(db, "like", 3, SQLITE_UTF8, pCtx, likeFunc, 0, 0);
1.1396 + if( rc!=SQLITE_OK ) return rc;
1.1397 + setLikeOptFlag(db, "like", SQLITE_FUNC_LIKE);
1.1398 + return SQLITE_OK;
1.1399 +}