sqlcipher/src/func.c at attach · securitykernel/sqlcipher · GitHub

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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.

#include "sqliteInt.h"

#include <stdlib.h>

#include <assert.h>

#include "vdbeInt.h"

** Return the collating function associated with a function.

static CollSeq *sqlite3GetFuncCollSeq(sqlite3_context *context){

return context->pColl;

}

** Indicate that the accumulator load should be skipped on this

** iteration of the aggregate loop.

static void sqlite3SkipAccumulatorLoad(sqlite3_context *context){

context->skipFlag = 1;

}

** 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;

assert( argc>1 );

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 ){

testcase( mask==0 );

iBest = i;

}

sqlite3_result_value(context, argv[iBest]);

}

** Return the type of the argument.

static void typeofFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **argv

){

const char *z = 0;

UNUSED_PARAMETER(NotUsed);

switch( sqlite3_value_type(argv[0]) ){

case SQLITE_INTEGER: z = "integer"; break;

case SQLITE_TEXT: z = "text"; break;

case SQLITE_FLOAT: z = "real"; break;

case SQLITE_BLOB: z = "blob"; break;

default: z = "null"; 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 );

UNUSED_PARAMETER(argc);

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 unsigned char *z = sqlite3_value_text(argv[0]);

if( z==0 ) return;

len = 0;

while( *z ){

len++;

SQLITE_SKIP_UTF8(z);

}

sqlite3_result_int(context, len);

break;

}

default: {

sqlite3_result_null(context);

break;

}

** Implementation of the abs() function.

** IMP: R-23979-26855 The abs(X) function returns the absolute value of

** the numeric argument X.

static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){

assert( argc==1 );

UNUSED_PARAMETER(argc);

switch( sqlite3_value_type(argv[0]) ){

case SQLITE_INTEGER: {

i64 iVal = sqlite3_value_int64(argv[0]);

if( iVal<0 ){

if( (iVal<<1)==0 ){

/* IMP: R-35460-15084 If X is the integer -9223372036854775807 then

** abs(X) throws an integer overflow error since there is no

** equivalent positive 64-bit two complement value. */

sqlite3_result_error(context, "integer overflow", -1);

return;

}

iVal = -iVal;

}

sqlite3_result_int64(context, iVal);

break;

}

case SQLITE_NULL: {

/* IMP: R-37434-19929 Abs(X) returns NULL if X is NULL. */

sqlite3_result_null(context);

break;

}

default: {

/* Because sqlite3_value_double() returns 0.0 if the argument is not

** something that can be converted into a number, we have:

** IMP: R-57326-31541 Abs(X) return 0.0 if X is a string or blob that

** cannot be converted to a numeric value.

double rVal = sqlite3_value_double(argv[0]);

if( rVal<0 ) rVal = -rVal;

sqlite3_result_double(context, rVal);

break;

}

** Implementation of the instr() function.

** instr(haystack,needle) finds the first occurrence of needle

** in haystack and returns the number of previous characters plus 1,

** or 0 if needle does not occur within haystack.

** If both haystack and needle are BLOBs, then the result is one more than

** the number of bytes in haystack prior to the first occurrence of needle,

** or 0 if needle never occurs in haystack.

static void instrFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

const unsigned char *zHaystack;

const unsigned char *zNeedle;

int nHaystack;

int nNeedle;

int typeHaystack, typeNeedle;

int N = 1;

int isText;

UNUSED_PARAMETER(argc);

typeHaystack = sqlite3_value_type(argv[0]);

typeNeedle = sqlite3_value_type(argv[1]);

if( typeHaystack==SQLITE_NULL || typeNeedle==SQLITE_NULL ) return;

nHaystack = sqlite3_value_bytes(argv[0]);

nNeedle = sqlite3_value_bytes(argv[1]);

if( typeHaystack==SQLITE_BLOB && typeNeedle==SQLITE_BLOB ){

zHaystack = sqlite3_value_blob(argv[0]);

zNeedle = sqlite3_value_blob(argv[1]);

isText = 0;

}else{

zHaystack = sqlite3_value_text(argv[0]);

zNeedle = sqlite3_value_text(argv[1]);

isText = 1;

}

while( nNeedle<=nHaystack && memcmp(zHaystack, zNeedle, nNeedle)!=0 ){

N++;

do{

nHaystack--;

zHaystack++;

}while( isText && (zHaystack[0]&0xc0)==0x80 );

}

if( nNeedle>nHaystack ) N = 0;

sqlite3_result_int(context, N);

}

** Implementation of the substr() function.

** substr(x,p1,p2) returns p2 characters of x[] beginning with p1.

** p1 is 1-indexed. So substr(x,1,1) returns the first character

** of x. If x is text, then we actually count UTF-8 characters.

** If x is a blob, then we count bytes.

** If p1 is negative, then we begin abs(p1) from the end of x[].

** If p2 is negative, return the p2 characters preceeding p1.

static void substrFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

const unsigned char *z;

const unsigned char *z2;

int len;

int p0type;

i64 p1, p2;

int negP2 = 0;

assert( argc==3 || argc==2 );

if( sqlite3_value_type(argv[1])==SQLITE_NULL

|| (argc==3 && sqlite3_value_type(argv[2])==SQLITE_NULL)

){

return;

}

p0type = sqlite3_value_type(argv[0]);

p1 = sqlite3_value_int(argv[1]);

if( p0type==SQLITE_BLOB ){

len = sqlite3_value_bytes(argv[0]);

z = sqlite3_value_blob(argv[0]);

if( z==0 ) return;

assert( len==sqlite3_value_bytes(argv[0]) );

}else{

z = sqlite3_value_text(argv[0]);

if( z==0 ) return;

len = 0;

if( p1<0 ){

for(z2=z; *z2; len++){

SQLITE_SKIP_UTF8(z2);

}

if( argc==3 ){

p2 = sqlite3_value_int(argv[2]);

if( p2<0 ){

p2 = -p2;

negP2 = 1;

}

}else{

p2 = sqlite3_context_db_handle(context)->aLimit[SQLITE_LIMIT_LENGTH];

}

if( p1<0 ){

p1 += len;

if( p1<0 ){

p2 += p1;

if( p2<0 ) p2 = 0;

p1 = 0;

}

}else if( p1>0 ){

p1--;

}else if( p2>0 ){

p2--;

}

if( negP2 ){

p1 -= p2;

if( p1<0 ){

p2 += p1;

p1 = 0;

}

assert( p1>=0 && p2>=0 );

if( p0type!=SQLITE_BLOB ){

while( *z && p1 ){

SQLITE_SKIP_UTF8(z);

p1--;

}

for(z2=z; *z2 && p2; p2--){

SQLITE_SKIP_UTF8(z2);

}

sqlite3_result_text(context, (char*)z, (int)(z2-z), SQLITE_TRANSIENT);

}else{

if( p1+p2>len ){

p2 = len-p1;

if( p2<0 ) p2 = 0;

}

sqlite3_result_blob(context, (char*)&z[p1], (int)p2, SQLITE_TRANSIENT);

}

** Implementation of the round() function

#ifndef SQLITE_OMIT_FLOATING_POINT

static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){

int n = 0;

double r;

char *zBuf;

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( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;

r = sqlite3_value_double(argv[0]);

/* If Y==0 and X will fit in a 64-bit int,

** handle the rounding directly,

** otherwise use printf.

if( n==0 && r>=0 && r<LARGEST_INT64-1 ){

r = (double)((sqlite_int64)(r+0.5));

}else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){

r = -(double)((sqlite_int64)((-r)+0.5));

}else{

zBuf = sqlite3_mprintf("%.*f",n,r);

if( zBuf==0 ){

sqlite3_result_error_nomem(context);

return;

}

sqlite3AtoF(zBuf, &r, sqlite3Strlen30(zBuf), SQLITE_UTF8);

sqlite3_free(zBuf);

}

sqlite3_result_double(context, r);

}

#endif

** Allocate nByte bytes of space using sqlite3_malloc(). If the

** allocation fails, call sqlite3_result_error_nomem() to notify

** the database handle that malloc() has failed and return NULL.

** If nByte is larger than the maximum string or blob length, then

** raise an SQLITE_TOOBIG exception and return NULL.

static void *contextMalloc(sqlite3_context *context, i64 nByte){

char *z;

sqlite3 *db = sqlite3_context_db_handle(context);

assert( nByte>0 );

testcase( nByte==db->aLimit[SQLITE_LIMIT_LENGTH] );

testcase( nByte==db->aLimit[SQLITE_LIMIT_LENGTH]+1 );

if( nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){

sqlite3_result_error_toobig(context);

z = 0;

}else{

z = sqlite3Malloc((int)nByte);

if( !z ){

sqlite3_result_error_nomem(context);

}

return z;

}

** Implementation of the upper() and lower() SQL functions.

static void upperFunc(sqlite3_context *context, int argc, sqlite3_value **argv){

char *z1;

const char *z2;

int i, n;

UNUSED_PARAMETER(argc);

z2 = (char*)sqlite3_value_text(argv[0]);

n = sqlite3_value_bytes(argv[0]);

/* Verify that the call to _bytes() does not invalidate the _text() pointer */

assert( z2==(char*)sqlite3_value_text(argv[0]) );

if( z2 ){

z1 = contextMalloc(context, ((i64)n)+1);

if( z1 ){

for(i=0; i<n; i++){

z1[i] = (char)sqlite3Toupper(z2[i]);

}

sqlite3_result_text(context, z1, n, sqlite3_free);

}

static void lowerFunc(sqlite3_context *context, int argc, sqlite3_value **argv){

char *z1;

const char *z2;

int i, n;

UNUSED_PARAMETER(argc);

z2 = (char*)sqlite3_value_text(argv[0]);

n = sqlite3_value_bytes(argv[0]);

/* Verify that the call to _bytes() does not invalidate the _text() pointer */

assert( z2==(char*)sqlite3_value_text(argv[0]) );

if( z2 ){

z1 = contextMalloc(context, ((i64)n)+1);

if( z1 ){

for(i=0; i<n; i++){

z1[i] = sqlite3Tolower(z2[i]);

}

sqlite3_result_text(context, z1, n, sqlite3_free);

}

** The COALESCE() and IFNULL() functions are implemented as VDBE code so

** that unused argument values do not have to be computed. However, we

** still need some kind of function implementation for this routines in

** the function table. That function implementation will never be called

** so it doesn't matter what the implementation is. We might as well use

** the "version()" function as a substitute.

#define ifnullFunc versionFunc /* Substitute function - never called */

** Implementation of random(). Return a random integer.

static void randomFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **NotUsed2

){

sqlite_int64 r;

UNUSED_PARAMETER2(NotUsed, NotUsed2);

sqlite3_randomness(sizeof(r), &r);

if( r<0 ){

/* We need to prevent a random number of 0x8000000000000000

** (or -9223372036854775808) since when you do abs() of that

** number of you get the same value back again. To do this

** in a way that is testable, mask the sign bit off of negative

** values, resulting in a positive value. Then take the

** 2s complement of that positive value. The end result can

** therefore be no less than -9223372036854775807.

r = -(r & LARGEST_INT64);

}

sqlite3_result_int64(context, r);

}

** Implementation of randomblob(N). Return a random blob

** that is N bytes long.

static void randomBlob(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

int n;

unsigned char *p;

assert( argc==1 );

UNUSED_PARAMETER(argc);

n = sqlite3_value_int(argv[0]);

if( n<1 ){

n = 1;

}

p = contextMalloc(context, n);

if( p ){

sqlite3_randomness(n, p);

sqlite3_result_blob(context, (char*)p, n, sqlite3_free);

}

** 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 NotUsed,

sqlite3_value **NotUsed2

){

sqlite3 *db = sqlite3_context_db_handle(context);

UNUSED_PARAMETER2(NotUsed, NotUsed2);

/* IMP: R-51513-12026 The last_insert_rowid() SQL function is a

** wrapper around the sqlite3_last_insert_rowid() C/C++ interface

** function. */

sqlite3_result_int64(context, sqlite3_last_insert_rowid(db));

}

** Implementation of the changes() SQL function.

** IMP: R-62073-11209 The changes() SQL function is a wrapper

** around the sqlite3_changes() C/C++ function and hence follows the same

** rules for counting changes.

static void changes(

sqlite3_context *context,

int NotUsed,

sqlite3_value **NotUsed2

){

sqlite3 *db = sqlite3_context_db_handle(context);

UNUSED_PARAMETER2(NotUsed, NotUsed2);

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 NotUsed,

sqlite3_value **NotUsed2

){

sqlite3 *db = sqlite3_context_db_handle(context);

UNUSED_PARAMETER2(NotUsed, NotUsed2);

/* IMP: R-52756-41993 This function is a wrapper around the

** sqlite3_total_changes() C/C++ interface. */

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;

};

** For LIKE and GLOB matching on EBCDIC machines, assume that every

** character is exactly one byte in size. Also, all characters are

** able to participate in upper-case-to-lower-case mappings in EBCDIC

** whereas only characters less than 0x80 do in ASCII.

#if defined(SQLITE_EBCDIC)

# define sqlite3Utf8Read(A) (*((*A)++))

# define GlogUpperToLower(A) A = sqlite3UpperToLower[A]

#else

# define GlogUpperToLower(A) if( !((A)&~0x7f) ){ A = sqlite3UpperToLower[A]; }

#endif

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 };

** 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 */

u32 esc /* The escape character */

){

u32 c, c2;

int invert;

int seen;

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 = sqlite3Utf8Read(&zPattern))!=0 ){

if( c==matchAll && !prevEscape ){

while( (c=sqlite3Utf8Read(&zPattern)) == matchAll

|| c == matchOne ){

if( c==matchOne && sqlite3Utf8Read(&zString)==0 ){

return 0;

}

if( c==0 ){

return 1;

}else if( c==esc ){

c = sqlite3Utf8Read(&zPattern);

if( c==0 ){

return 0;

}

}else if( c==matchSet ){

assert( esc==0 ); /* This is GLOB, not LIKE */

assert( matchSet<0x80 ); /* '[' is a single-byte character */

while( *zString && patternCompare(&zPattern[-1],zString,pInfo,esc)==0 ){

SQLITE_SKIP_UTF8(zString);

}

return *zString!=0;

}

while( (c2 = sqlite3Utf8Read(&zString))!=0 ){

if( noCase ){

GlogUpperToLower(c2);

GlogUpperToLower(c);

while( c2 != 0 && c2 != c ){

c2 = sqlite3Utf8Read(&zString);

GlogUpperToLower(c2);

}

}else{

while( c2 != 0 && c2 != c ){

c2 = sqlite3Utf8Read(&zString);

}

if( c2==0 ) return 0;

if( patternCompare(zPattern,zString,pInfo,esc) ) return 1;

}

return 0;

}else if( c==matchOne && !prevEscape ){

if( sqlite3Utf8Read(&zString)==0 ){

return 0;

}

}else if( c==matchSet ){

u32 prior_c = 0;

assert( esc==0 ); /* This only occurs for GLOB, not LIKE */

seen = 0;

invert = 0;

c = sqlite3Utf8Read(&zString);

if( c==0 ) return 0;

c2 = sqlite3Utf8Read(&zPattern);

if( c2=='^' ){

invert = 1;

c2 = sqlite3Utf8Read(&zPattern);

}

if( c2==']' ){

if( c==']' ) seen = 1;

c2 = sqlite3Utf8Read(&zPattern);

}

while( c2 && c2!=']' ){

if( c2=='-' && zPattern[0]!=']' && zPattern[0]!=0 && prior_c>0 ){

c2 = sqlite3Utf8Read(&zPattern);

if( c>=prior_c && c<=c2 ) seen = 1;

prior_c = 0;

}else{

if( c==c2 ){

seen = 1;

}

prior_c = c2;

}

c2 = sqlite3Utf8Read(&zPattern);

}

if( c2==0 || (seen ^ invert)==0 ){

return 0;

}

}else if( esc==c && !prevEscape ){

prevEscape = 1;

}else{

c2 = sqlite3Utf8Read(&zString);

if( noCase ){

GlogUpperToLower(c);

GlogUpperToLower(c2);

}

if( c!=c2 ){

return 0;

}

prevEscape = 0;

}

return *zString==0;

}

** The sqlite3_strglob() interface.

int sqlite3_strglob(const char *zGlobPattern, const char *zString){

return patternCompare((u8*)zGlobPattern, (u8*)zString, &globInfo, 0)==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, *zB;

u32 escape = 0;

int nPat;

sqlite3 *db = sqlite3_context_db_handle(context);

zB = sqlite3_value_text(argv[0]);

zA = sqlite3_value_text(argv[1]);

/* Limit the length of the LIKE or GLOB pattern to avoid problems

** of deep recursion and N*N behavior in patternCompare().

nPat = sqlite3_value_bytes(argv[0]);

testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] );

testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]+1 );

if( nPat > db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] ){

sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);

return;

}

assert( zB==sqlite3_value_text(argv[0]) ); /* Encoding did not change */

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( zEsc==0 ) return;

if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){

sqlite3_result_error(context,

"ESCAPE expression must be a single character", -1);

return;

}

escape = sqlite3Utf8Read(&zEsc);

}

if( zA && zB ){

struct compareInfo *pInfo = sqlite3_user_data(context);

#ifdef SQLITE_TEST

sqlite3_like_count++;

#endif

sqlite3_result_int(context, patternCompare(zB, zA, 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 NotUsed,

sqlite3_value **argv

){

CollSeq *pColl = sqlite3GetFuncCollSeq(context);

UNUSED_PARAMETER(NotUsed);

if( sqlite3MemCompare(argv[0], argv[1], pColl)!=0 ){

sqlite3_result_value(context, argv[0]);

}

** Implementation of the sqlite_version() function. The result is the version

** of the SQLite library that is running.

static void versionFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **NotUsed2

){

UNUSED_PARAMETER2(NotUsed, NotUsed2);

/* IMP: R-48699-48617 This function is an SQL wrapper around the

** sqlite3_libversion() C-interface. */

sqlite3_result_text(context, sqlite3_libversion(), -1, SQLITE_STATIC);

}

** Implementation of the sqlite_source_id() function. The result is a string

** that identifies the particular version of the source code used to build

** SQLite.

static void sourceidFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **NotUsed2

){

UNUSED_PARAMETER2(NotUsed, NotUsed2);

/* IMP: R-24470-31136 This function is an SQL wrapper around the

** sqlite3_sourceid() C interface. */

sqlite3_result_text(context, sqlite3_sourceid(), -1, SQLITE_STATIC);

}

** Implementation of the sqlite_log() function. This is a wrapper around

** sqlite3_log(). The return value is NULL. The function exists purely for

** its side-effects.

static void errlogFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

UNUSED_PARAMETER(argc);

UNUSED_PARAMETER(context);

sqlite3_log(sqlite3_value_int(argv[0]), "%s", sqlite3_value_text(argv[1]));

}

** Implementation of the sqlite_compileoption_used() function.

** The result is an integer that identifies if the compiler option

** was used to build SQLite.

#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS

static void compileoptionusedFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

const char *zOptName;

assert( argc==1 );

UNUSED_PARAMETER(argc);

/* IMP: R-39564-36305 The sqlite_compileoption_used() SQL

** function is a wrapper around the sqlite3_compileoption_used() C/C++

** function.

if( (zOptName = (const char*)sqlite3_value_text(argv[0]))!=0 ){

sqlite3_result_int(context, sqlite3_compileoption_used(zOptName));

}

#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */

** Implementation of the sqlite_compileoption_get() function.

** The result is a string that identifies the compiler options

** used to build SQLite.

#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS

static void compileoptiongetFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

int n;

assert( argc==1 );

UNUSED_PARAMETER(argc);

/* IMP: R-04922-24076 The sqlite_compileoption_get() SQL function

** is a wrapper around the sqlite3_compileoption_get() C/C++ function.

n = sqlite3_value_int(argv[0]);

sqlite3_result_text(context, sqlite3_compileoption_get(n), -1, SQLITE_STATIC);

}

#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */

/* Array for converting from half-bytes (nybbles) into ASCII hex

** digits. */

static const char hexdigits[] = {

'0', '1', '2', '3', '4', '5', '6', '7',

'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'

};

** 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){

assert( argc==1 );

UNUSED_PARAMETER(argc);

switch( sqlite3_value_type(argv[0]) ){

case SQLITE_FLOAT: {

double r1, r2;

char zBuf[50];

r1 = sqlite3_value_double(argv[0]);

sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.15g", r1);

sqlite3AtoF(zBuf, &r2, 20, SQLITE_UTF8);

if( r1!=r2 ){

sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.20e", r1);

}

sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);

break;

}

case SQLITE_INTEGER: {

sqlite3_result_value(context, argv[0]);

break;

}

case SQLITE_BLOB: {

char *zText = 0;

char const *zBlob = sqlite3_value_blob(argv[0]);

int nBlob = sqlite3_value_bytes(argv[0]);

assert( zBlob==sqlite3_value_blob(argv[0]) ); /* No encoding change */

zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4);

if( zText ){

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);

sqlite3_free(zText);

}

break;

}

case SQLITE_TEXT: {

int i,j;

u64 n;

const unsigned char *zArg = sqlite3_value_text(argv[0]);

char *z;

if( zArg==0 ) return;

for(i=0, n=0; zArg[i]; i++){ if( zArg[i]=='\'' ) n++; }

z = contextMalloc(context, ((i64)i)+((i64)n)+3);

if( z ){

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, sqlite3_free);

}

break;

}

default: {

assert( sqlite3_value_type(argv[0])==SQLITE_NULL );

sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);

break;

}

** The unicode() function. Return the integer unicode code-point value

** for the first character of the input string.

static void unicodeFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

const unsigned char *z = sqlite3_value_text(argv[0]);

(void)argc;

if( z && z[0] ) sqlite3_result_int(context, sqlite3Utf8Read(&z));

}

** The char() function takes zero or more arguments, each of which is

** an integer. It constructs a string where each character of the string

** is the unicode character for the corresponding integer argument.

static void charFunc(

sqlite3_context *context,

int argc,

sqlite3_value **argv

){

unsigned char *z, *zOut;

int i;

zOut = z = sqlite3_malloc( argc*4 );

if( z==0 ){

sqlite3_result_error_nomem(context);

View remainder of file in raw view

sqlcipher/src/func.c at attach · securitykernel/sqlcipher · GitHub

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