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Diffstat (limited to 'ext/misc/normalize.c')
| -rw-r--r-- | ext/misc/normalize.c | 716 |
1 files changed, 716 insertions, 0 deletions
diff --git a/ext/misc/normalize.c b/ext/misc/normalize.c new file mode 100644 index 0000000..08d7733 --- /dev/null +++ b/ext/misc/normalize.c @@ -0,0 +1,716 @@ +/* +** 2018-01-08 +** +** 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 code to implement the sqlite3_normalize() function. +** +** char *sqlite3_normalize(const char *zSql); +** +** This function takes an SQL string as input and returns a "normalized" +** version of that string in memory obtained from sqlite3_malloc64(). The +** caller is responsible for ensuring that the returned memory is freed. +** +** If a memory allocation error occurs, this routine returns NULL. +** +** The normalization consists of the following transformations: +** +** (1) Convert every literal (string, blob literal, numeric constant, +** or "NULL" constant) into a ? +** +** (2) Remove all superfluous whitespace, including comments. Change +** all required whitespace to a single space character. +** +** (3) Lowercase all ASCII characters. +** +** (4) If an IN or NOT IN operator is followed by a list of 1 or more +** values, convert that list into "(?,?,?)". +** +** The purpose of normalization is two-fold: +** +** (1) Sanitize queries by removing potentially private or sensitive +** information contained in literals. +** +** (2) Identify structurally identical queries by comparing their +** normalized forms. +** +** Command-Line Utility +** -------------------- +** +** This file also contains code for a command-line utility that converts +** SQL queries in text files into their normalized forms. To build the +** command-line program, compile this file with -DSQLITE_NORMALIZE_CLI +** and link it against the SQLite library. +*/ +#include <sqlite3.h> +#include <string.h> + +/* +** Implementation note: +** +** Much of the tokenizer logic is copied out of the tokenize.c source file +** of SQLite. That logic could be simplified for this particular application, +** but that would impose a risk of introducing subtle errors. It is best to +** keep the code as close to the original as possible. +** +** The tokenize code is in sync with the SQLite core as of 2018-01-08. +** Any future changes to the core tokenizer might require corresponding +** adjustments to the tokenizer logic in this module. +*/ + + +/* Character classes for tokenizing +** +** In the sqlite3GetToken() function, a switch() on aiClass[c] is implemented +** using a lookup table, whereas a switch() directly on c uses a binary search. +** The lookup table is much faster. To maximize speed, and to ensure that +** a lookup table is used, all of the classes need to be small integers and +** all of them need to be used within the switch. +*/ +#define CC_X 0 /* The letter 'x', or start of BLOB literal */ +#define CC_KYWD 1 /* Alphabetics or '_'. Usable in a keyword */ +#define CC_ID 2 /* unicode characters usable in IDs */ +#define CC_DIGIT 3 /* Digits */ +#define CC_DOLLAR 4 /* '$' */ +#define CC_VARALPHA 5 /* '@', '#', ':'. Alphabetic SQL variables */ +#define CC_VARNUM 6 /* '?'. Numeric SQL variables */ +#define CC_SPACE 7 /* Space characters */ +#define CC_QUOTE 8 /* '"', '\'', or '`'. String literals, quoted ids */ +#define CC_QUOTE2 9 /* '['. [...] style quoted ids */ +#define CC_PIPE 10 /* '|'. Bitwise OR or concatenate */ +#define CC_MINUS 11 /* '-'. Minus or SQL-style comment */ +#define CC_LT 12 /* '<'. Part of < or <= or <> */ +#define CC_GT 13 /* '>'. Part of > or >= */ +#define CC_EQ 14 /* '='. Part of = or == */ +#define CC_BANG 15 /* '!'. Part of != */ +#define CC_SLASH 16 /* '/'. / or c-style comment */ +#define CC_LP 17 /* '(' */ +#define CC_RP 18 /* ')' */ +#define CC_SEMI 19 /* ';' */ +#define CC_PLUS 20 /* '+' */ +#define CC_STAR 21 /* '*' */ +#define CC_PERCENT 22 /* '%' */ +#define CC_COMMA 23 /* ',' */ +#define CC_AND 24 /* '&' */ +#define CC_TILDA 25 /* '~' */ +#define CC_DOT 26 /* '.' */ +#define CC_ILLEGAL 27 /* Illegal character */ + +static const unsigned char aiClass[] = { +/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ +/* 0x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 7, 7, 27, 7, 7, 27, 27, +/* 1x */ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, +/* 2x */ 7, 15, 8, 5, 4, 22, 24, 8, 17, 18, 21, 20, 23, 11, 26, 16, +/* 3x */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 19, 12, 14, 13, 6, +/* 4x */ 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, +/* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 9, 27, 27, 27, 1, +/* 6x */ 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, +/* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 27, 10, 27, 25, 27, +/* 8x */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* 9x */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Ax */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Bx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Cx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Dx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Ex */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, +/* Fx */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 +}; + +/* An array to map all upper-case characters into their corresponding +** lower-case character. +** +** SQLite only considers US-ASCII (or EBCDIC) characters. We do not +** handle case conversions for the UTF character set since the tables +** involved are nearly as big or bigger than SQLite itself. +*/ +static const unsigned char sqlite3UpperToLower[] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, + 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, + 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, + 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 97, 98, 99,100,101,102,103, + 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121, + 122, 91, 92, 93, 94, 95, 96, 97, 98, 99,100,101,102,103,104,105,106,107, + 108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125, + 126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, + 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161, + 162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179, + 180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197, + 198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215, + 216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233, + 234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251, + 252,253,254,255 +}; + +/* +** The following 256 byte lookup table is used to support SQLites built-in +** equivalents to the following standard library functions: +** +** isspace() 0x01 +** isalpha() 0x02 +** isdigit() 0x04 +** isalnum() 0x06 +** isxdigit() 0x08 +** toupper() 0x20 +** SQLite identifier character 0x40 +** Quote character 0x80 +** +** Bit 0x20 is set if the mapped character requires translation to upper +** case. i.e. if the character is a lower-case ASCII character. +** If x is a lower-case ASCII character, then its upper-case equivalent +** is (x - 0x20). Therefore toupper() can be implemented as: +** +** (x & ~(map[x]&0x20)) +** +** The equivalent of tolower() is implemented using the sqlite3UpperToLower[] +** array. tolower() is used more often than toupper() by SQLite. +** +** Bit 0x40 is set if the character is non-alphanumeric and can be used in an +** SQLite identifier. Identifiers are alphanumerics, "_", "$", and any +** non-ASCII UTF character. Hence the test for whether or not a character is +** part of an identifier is 0x46. +*/ +static const unsigned char sqlite3CtypeMap[256] = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00..07 ........ */ + 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, /* 08..0f ........ */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10..17 ........ */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 18..1f ........ */ + 0x01, 0x00, 0x80, 0x00, 0x40, 0x00, 0x00, 0x80, /* 20..27 !"#$%&' */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 28..2f ()*+,-./ */ + 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, /* 30..37 01234567 */ + 0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 38..3f 89:;<=>? */ + + 0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02, /* 40..47 @ABCDEFG */ + 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, /* 48..4f HIJKLMNO */ + 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, /* 50..57 PQRSTUVW */ + 0x02, 0x02, 0x02, 0x80, 0x00, 0x00, 0x00, 0x40, /* 58..5f XYZ[\]^_ */ + 0x80, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22, /* 60..67 `abcdefg */ + 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, /* 68..6f hijklmno */ + 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, /* 70..77 pqrstuvw */ + 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, /* 78..7f xyz{|}~. */ + + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 80..87 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 88..8f ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 90..97 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 98..9f ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* a0..a7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* a8..af ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* b0..b7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* b8..bf ........ */ + + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* c0..c7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* c8..cf ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* d0..d7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* d8..df ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* e0..e7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* e8..ef ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* f0..f7 ........ */ + 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 /* f8..ff ........ */ +}; +#define sqlite3Toupper(x) ((x)&~(sqlite3CtypeMap[(unsigned char)(x)]&0x20)) +#define sqlite3Isspace(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x01) +#define sqlite3Isalnum(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x06) +#define sqlite3Isalpha(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x02) +#define sqlite3Isdigit(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x04) +#define sqlite3Isxdigit(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x08) +#define sqlite3Tolower(x) (sqlite3UpperToLower[(unsigned char)(x)]) +#define sqlite3Isquote(x) (sqlite3CtypeMap[(unsigned char)(x)]&0x80) + + +/* +** If X is a character that can be used in an identifier then +** IdChar(X) will be true. Otherwise it is false. +** +** For ASCII, any character with the high-order bit set is +** allowed in an identifier. For 7-bit characters, +** sqlite3IsIdChar[X] must be 1. +** +** For EBCDIC, the rules are more complex but have the same +** end result. +** +** Ticket #1066. the SQL standard does not allow '$' in the +** middle of identifiers. But many SQL implementations do. +** SQLite will allow '$' in identifiers for compatibility. +** But the feature is undocumented. +*/ +#define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0) + +/* +** Ignore testcase() macros +*/ +#define testcase(X) + +/* +** Token values +*/ +#define TK_SPACE 0 +#define TK_NAME 1 +#define TK_LITERAL 2 +#define TK_PUNCT 3 +#define TK_ERROR 4 + +#define TK_MINUS TK_PUNCT +#define TK_LP TK_PUNCT +#define TK_RP TK_PUNCT +#define TK_SEMI TK_PUNCT +#define TK_PLUS TK_PUNCT +#define TK_STAR TK_PUNCT +#define TK_SLASH TK_PUNCT +#define TK_REM TK_PUNCT +#define TK_EQ TK_PUNCT +#define TK_LE TK_PUNCT +#define TK_NE TK_PUNCT +#define TK_LSHIFT TK_PUNCT +#define TK_LT TK_PUNCT +#define TK_GE TK_PUNCT +#define TK_RSHIFT TK_PUNCT +#define TK_GT TK_PUNCT +#define TK_GE TK_PUNCT +#define TK_BITOR TK_PUNCT +#define TK_CONCAT TK_PUNCT +#define TK_COMMA TK_PUNCT +#define TK_BITAND TK_PUNCT +#define TK_BITNOT TK_PUNCT +#define TK_STRING TK_LITERAL +#define TK_ID TK_NAME +#define TK_ILLEGAL TK_ERROR +#define TK_DOT TK_PUNCT +#define TK_INTEGER TK_LITERAL +#define TK_FLOAT TK_LITERAL +#define TK_VARIABLE TK_LITERAL +#define TK_BLOB TK_LITERAL + +/* Disable nuisence warnings about case fall-through */ +#if !defined(deliberate_fall_through) && defined(__GCC__) && __GCC__>=7 +# define deliberate_fall_through __attribute__((fallthrough)); +#else +# define deliberate_fall_through +#endif + +/* +** Return the length (in bytes) of the token that begins at z[0]. +** Store the token type in *tokenType before returning. +*/ +static int sqlite3GetToken(const unsigned char *z, int *tokenType){ + int i, c; + switch( aiClass[*z] ){ /* Switch on the character-class of the first byte + ** of the token. See the comment on the CC_ defines + ** above. */ + case CC_SPACE: { + for(i=1; sqlite3Isspace(z[i]); i++){} + *tokenType = TK_SPACE; + return i; + } + case CC_MINUS: { + if( z[1]=='-' ){ + for(i=2; (c=z[i])!=0 && c!='\n'; i++){} + *tokenType = TK_SPACE; + return i; + } + *tokenType = TK_MINUS; + return 1; + } + case CC_LP: { + *tokenType = TK_LP; + return 1; + } + case CC_RP: { + *tokenType = TK_RP; + return 1; + } + case CC_SEMI: { + *tokenType = TK_SEMI; + return 1; + } + case CC_PLUS: { + *tokenType = TK_PLUS; + return 1; + } + case CC_STAR: { + *tokenType = TK_STAR; + return 1; + } + case CC_SLASH: { + if( z[1]!='*' || z[2]==0 ){ + *tokenType = TK_SLASH; + return 1; + } + for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){} + if( c ) i++; + *tokenType = TK_SPACE; + return i; + } + case CC_PERCENT: { + *tokenType = TK_REM; + return 1; + } + case CC_EQ: { + *tokenType = TK_EQ; + return 1 + (z[1]=='='); + } + case CC_LT: { + if( (c=z[1])=='=' ){ + *tokenType = TK_LE; + return 2; + }else if( c=='>' ){ + *tokenType = TK_NE; + return 2; + }else if( c=='<' ){ + *tokenType = TK_LSHIFT; + return 2; + }else{ + *tokenType = TK_LT; + return 1; + } + } + case CC_GT: { + if( (c=z[1])=='=' ){ + *tokenType = TK_GE; + return 2; + }else if( c=='>' ){ + *tokenType = TK_RSHIFT; + return 2; + }else{ + *tokenType = TK_GT; + return 1; + } + } + case CC_BANG: { + if( z[1]!='=' ){ + *tokenType = TK_ILLEGAL; + return 1; + }else{ + *tokenType = TK_NE; + return 2; + } + } + case CC_PIPE: { + if( z[1]!='|' ){ + *tokenType = TK_BITOR; + return 1; + }else{ + *tokenType = TK_CONCAT; + return 2; + } + } + case CC_COMMA: { + *tokenType = TK_COMMA; + return 1; + } + case CC_AND: { + *tokenType = TK_BITAND; + return 1; + } + case CC_TILDA: { + *tokenType = TK_BITNOT; + return 1; + } + case CC_QUOTE: { + int delim = z[0]; + testcase( delim=='`' ); + testcase( delim=='\'' ); + testcase( delim=='"' ); + for(i=1; (c=z[i])!=0; i++){ + if( c==delim ){ + if( z[i+1]==delim ){ + i++; + }else{ + break; + } + } + } + if( c=='\'' ){ + *tokenType = TK_STRING; + return i+1; + }else if( c!=0 ){ + *tokenType = TK_ID; + return i+1; + }else{ + *tokenType = TK_ILLEGAL; + return i; + } + } + case CC_DOT: { + if( !sqlite3Isdigit(z[1]) ){ + *tokenType = TK_DOT; + return 1; + } + /* If the next character is a digit, this is a floating point + ** number that begins with ".". Fall thru into the next case */ + /* no break */ deliberate_fall_through + } + case CC_DIGIT: { + *tokenType = TK_INTEGER; + if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){ + for(i=3; sqlite3Isxdigit(z[i]); i++){} + return i; + } + for(i=0; sqlite3Isdigit(z[i]); i++){} + if( z[i]=='.' ){ + i++; + while( sqlite3Isdigit(z[i]) ){ i++; } + *tokenType = TK_FLOAT; + } + if( (z[i]=='e' || z[i]=='E') && + ( sqlite3Isdigit(z[i+1]) + || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2])) + ) + ){ + i += 2; + while( sqlite3Isdigit(z[i]) ){ i++; } + *tokenType = TK_FLOAT; + } + while( IdChar(z[i]) ){ + *tokenType = TK_ILLEGAL; + i++; + } + return i; + } + case CC_QUOTE2: { + for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){} + *tokenType = c==']' ? TK_ID : TK_ILLEGAL; + return i; + } + case CC_VARNUM: { + *tokenType = TK_VARIABLE; + for(i=1; sqlite3Isdigit(z[i]); i++){} + return i; + } + case CC_DOLLAR: + case CC_VARALPHA: { + int n = 0; + testcase( z[0]=='$' ); testcase( z[0]=='@' ); + testcase( z[0]==':' ); testcase( z[0]=='#' ); + *tokenType = TK_VARIABLE; + for(i=1; (c=z[i])!=0; i++){ + if( IdChar(c) ){ + n++; + }else if( c=='(' && n>0 ){ + do{ + i++; + }while( (c=z[i])!=0 && !sqlite3Isspace(c) && c!=')' ); + if( c==')' ){ + i++; + }else{ + *tokenType = TK_ILLEGAL; + } + break; + }else if( c==':' && z[i+1]==':' ){ + i++; + }else{ + break; + } + } + if( n==0 ) *tokenType = TK_ILLEGAL; + return i; + } + case CC_KYWD: { + for(i=1; aiClass[z[i]]<=CC_KYWD; i++){} + if( IdChar(z[i]) ){ + /* This token started out using characters that can appear in keywords, + ** but z[i] is a character not allowed within keywords, so this must + ** be an identifier instead */ + i++; + break; + } + *tokenType = TK_ID; + return i; + } + case CC_X: { + testcase( z[0]=='x' ); testcase( z[0]=='X' ); + if( z[1]=='\'' ){ + *tokenType = TK_BLOB; + for(i=2; sqlite3Isxdigit(z[i]); i++){} + if( z[i]!='\'' || i%2 ){ + *tokenType = TK_ILLEGAL; + while( z[i] && z[i]!='\'' ){ i++; } + } + if( z[i] ) i++; + return i; + } + /* If it is not a BLOB literal, then it must be an ID, since no + ** SQL keywords start with the letter 'x'. Fall through */ + /* no break */ deliberate_fall_through + } + case CC_ID: { + i = 1; + break; + } + default: { + *tokenType = TK_ILLEGAL; + return 1; + } + } + while( IdChar(z[i]) ){ i++; } + *tokenType = TK_ID; + return i; +} + +char *sqlite3_normalize(const char *zSql){ + char *z; /* The output string */ + sqlite3_int64 nZ; /* Size of the output string in bytes */ + sqlite3_int64 nSql; /* Size of the input string in bytes */ + int i; /* Next character to read from zSql[] */ + int j; /* Next slot to fill in on z[] */ + int tokenType; /* Type of the next token */ + int n; /* Size of the next token */ + int k; /* Loop counter */ + + nSql = strlen(zSql); + nZ = nSql; + z = sqlite3_malloc64( nZ+2 ); + if( z==0 ) return 0; + for(i=j=0; zSql[i]; i += n){ + n = sqlite3GetToken((unsigned char*)zSql+i, &tokenType); + switch( tokenType ){ + case TK_SPACE: { + break; + } + case TK_ERROR: { + sqlite3_free(z); + return 0; + } + case TK_LITERAL: { + z[j++] = '?'; + break; + } + case TK_PUNCT: + case TK_NAME: { + if( n==4 && sqlite3_strnicmp(zSql+i,"NULL",4)==0 ){ + if( (j>=3 && strncmp(z+j-2,"is",2)==0 && !IdChar(z[j-3])) + || (j>=4 && strncmp(z+j-3,"not",3)==0 && !IdChar(z[j-4])) + ){ + /* NULL is a keyword in this case, not a literal value */ + }else{ + /* Here the NULL is a literal value */ + z[j++] = '?'; + break; + } + } + if( j>0 && IdChar(z[j-1]) && IdChar(zSql[i]) ) z[j++] = ' '; + for(k=0; k<n; k++){ + z[j++] = sqlite3Tolower(zSql[i+k]); + } + break; + } + } + } + while( j>0 && z[j-1]==' ' ){ j--; } + if( j>0 && z[j-1]!=';' ){ z[j++] = ';'; } + z[j] = 0; + + /* Make a second pass converting "in(...)" where the "..." is not a + ** SELECT statement into "in(?,?,?)" */ + for(i=0; i<j; i=n){ + char *zIn = strstr(z+i, "in("); + int nParen; + if( zIn==0 ) break; + n = (int)(zIn-z)+3; /* Index of first char past "in(" */ + if( n && IdChar(zIn[-1]) ) continue; + if( strncmp(zIn, "in(select",9)==0 && !IdChar(zIn[9]) ) continue; + if( strncmp(zIn, "in(with",7)==0 && !IdChar(zIn[7]) ) continue; + for(nParen=1, k=0; z[n+k]; k++){ + if( z[n+k]=='(' ) nParen++; + if( z[n+k]==')' ){ + nParen--; + if( nParen==0 ) break; + } + } + /* k is the number of bytes in the "..." within "in(...)" */ + if( k<5 ){ + z = sqlite3_realloc64(z, j+(5-k)+1); + if( z==0 ) return 0; + memmove(z+n+5, z+n+k, j-(n+k)); + }else if( k>5 ){ + memmove(z+n+5, z+n+k, j-(n+k)); + } + j = j-k+5; + z[j] = 0; + memcpy(z+n, "?,?,?", 5); + } + return z; +} + +/* +** For testing purposes, or to build a stand-alone SQL normalizer program, +** compile this one source file with the -DSQLITE_NORMALIZE_CLI and link +** it against any SQLite library. The resulting command-line program will +** run sqlite3_normalize() over the text of all files named on the command- +** line and show the result on standard output. +*/ +#ifdef SQLITE_NORMALIZE_CLI +#include <stdio.h> +#include <stdlib.h> + +/* +** Break zIn up into separate SQL statements and run sqlite3_normalize() +** on each one. Print the result of each run. +*/ +static void normalizeFile(char *zIn){ + int i; + if( zIn==0 ) return; + for(i=0; zIn[i]; i++){ + char cSaved; + if( zIn[i]!=';' ) continue; + cSaved = zIn[i+1]; + zIn[i+1] = 0; + if( sqlite3_complete(zIn) ){ + char *zOut = sqlite3_normalize(zIn); + if( zOut ){ + printf("%s\n", zOut); + sqlite3_free(zOut); + }else{ + fprintf(stderr, "ERROR: %s\n", zIn); + } + zIn[i+1] = cSaved; + zIn += i+1; + i = -1; + }else{ + zIn[i+1] = cSaved; + } + } +} + +/* +** The main routine for "sql_normalize". Read files named on the +** command-line and run the text of each through sqlite3_normalize(). +*/ +int main(int argc, char **argv){ + int i; + FILE *in; + char *zBuf = 0; + sqlite3_int64 sz, got; + + for(i=1; i<argc; i++){ + in = fopen(argv[i], "rb"); + if( in==0 ){ + fprintf(stderr, "cannot open \"%s\"\n", argv[i]); + continue; + } + fseek(in, 0, SEEK_END); + sz = ftell(in); + rewind(in); + zBuf = sqlite3_realloc64(zBuf, sz+1); + if( zBuf==0 ){ + fprintf(stderr, "failed to malloc for %lld bytes\n", sz); + exit(1); + } + got = fread(zBuf, 1, sz, in); + fclose(in); + if( got!=sz ){ + fprintf(stderr, "only able to read %lld of %lld bytes from \"%s\"\n", + got, sz, argv[i]); + }else{ + zBuf[got] = 0; + normalizeFile(zBuf); + } + } + sqlite3_free(zBuf); +} +#endif /* SQLITE_NORMALIZE_CLI */ |