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-rw-r--r--src/printf.c1437
1 files changed, 1437 insertions, 0 deletions
diff --git a/src/printf.c b/src/printf.c
new file mode 100644
index 0000000..c6b3803
--- /dev/null
+++ b/src/printf.c
@@ -0,0 +1,1437 @@
+/*
+** The "printf" code that follows dates from the 1980's. It is in
+** the public domain.
+**
+**************************************************************************
+**
+** This file contains code for a set of "printf"-like routines. These
+** routines format strings much like the printf() from the standard C
+** library, though the implementation here has enhancements to support
+** SQLite.
+*/
+#include "sqliteInt.h"
+
+/*
+** Conversion types fall into various categories as defined by the
+** following enumeration.
+*/
+#define etRADIX 0 /* non-decimal integer types. %x %o */
+#define etFLOAT 1 /* Floating point. %f */
+#define etEXP 2 /* Exponentional notation. %e and %E */
+#define etGENERIC 3 /* Floating or exponential, depending on exponent. %g */
+#define etSIZE 4 /* Return number of characters processed so far. %n */
+#define etSTRING 5 /* Strings. %s */
+#define etDYNSTRING 6 /* Dynamically allocated strings. %z */
+#define etPERCENT 7 /* Percent symbol. %% */
+#define etCHARX 8 /* Characters. %c */
+/* The rest are extensions, not normally found in printf() */
+#define etSQLESCAPE 9 /* Strings with '\'' doubled. %q */
+#define etSQLESCAPE2 10 /* Strings with '\'' doubled and enclosed in '',
+ NULL pointers replaced by SQL NULL. %Q */
+#define etTOKEN 11 /* a pointer to a Token structure */
+#define etSRCITEM 12 /* a pointer to a SrcItem */
+#define etPOINTER 13 /* The %p conversion */
+#define etSQLESCAPE3 14 /* %w -> Strings with '\"' doubled */
+#define etORDINAL 15 /* %r -> 1st, 2nd, 3rd, 4th, etc. English only */
+#define etDECIMAL 16 /* %d or %u, but not %x, %o */
+
+#define etINVALID 17 /* Any unrecognized conversion type */
+
+
+/*
+** An "etByte" is an 8-bit unsigned value.
+*/
+typedef unsigned char etByte;
+
+/*
+** Each builtin conversion character (ex: the 'd' in "%d") is described
+** by an instance of the following structure
+*/
+typedef struct et_info { /* Information about each format field */
+ char fmttype; /* The format field code letter */
+ etByte base; /* The base for radix conversion */
+ etByte flags; /* One or more of FLAG_ constants below */
+ etByte type; /* Conversion paradigm */
+ etByte charset; /* Offset into aDigits[] of the digits string */
+ etByte prefix; /* Offset into aPrefix[] of the prefix string */
+} et_info;
+
+/*
+** Allowed values for et_info.flags
+*/
+#define FLAG_SIGNED 1 /* True if the value to convert is signed */
+#define FLAG_STRING 4 /* Allow infinite precision */
+
+
+/*
+** The following table is searched linearly, so it is good to put the
+** most frequently used conversion types first.
+*/
+static const char aDigits[] = "0123456789ABCDEF0123456789abcdef";
+static const char aPrefix[] = "-x0\000X0";
+static const et_info fmtinfo[] = {
+ { 'd', 10, 1, etDECIMAL, 0, 0 },
+ { 's', 0, 4, etSTRING, 0, 0 },
+ { 'g', 0, 1, etGENERIC, 30, 0 },
+ { 'z', 0, 4, etDYNSTRING, 0, 0 },
+ { 'q', 0, 4, etSQLESCAPE, 0, 0 },
+ { 'Q', 0, 4, etSQLESCAPE2, 0, 0 },
+ { 'w', 0, 4, etSQLESCAPE3, 0, 0 },
+ { 'c', 0, 0, etCHARX, 0, 0 },
+ { 'o', 8, 0, etRADIX, 0, 2 },
+ { 'u', 10, 0, etDECIMAL, 0, 0 },
+ { 'x', 16, 0, etRADIX, 16, 1 },
+ { 'X', 16, 0, etRADIX, 0, 4 },
+#ifndef SQLITE_OMIT_FLOATING_POINT
+ { 'f', 0, 1, etFLOAT, 0, 0 },
+ { 'e', 0, 1, etEXP, 30, 0 },
+ { 'E', 0, 1, etEXP, 14, 0 },
+ { 'G', 0, 1, etGENERIC, 14, 0 },
+#endif
+ { 'i', 10, 1, etDECIMAL, 0, 0 },
+ { 'n', 0, 0, etSIZE, 0, 0 },
+ { '%', 0, 0, etPERCENT, 0, 0 },
+ { 'p', 16, 0, etPOINTER, 0, 1 },
+
+ /* All the rest are undocumented and are for internal use only */
+ { 'T', 0, 0, etTOKEN, 0, 0 },
+ { 'S', 0, 0, etSRCITEM, 0, 0 },
+ { 'r', 10, 1, etORDINAL, 0, 0 },
+};
+
+/* Notes:
+**
+** %S Takes a pointer to SrcItem. Shows name or database.name
+** %!S Like %S but prefer the zName over the zAlias
+*/
+
+/*
+** Set the StrAccum object to an error mode.
+*/
+void sqlite3StrAccumSetError(StrAccum *p, u8 eError){
+ assert( eError==SQLITE_NOMEM || eError==SQLITE_TOOBIG );
+ p->accError = eError;
+ if( p->mxAlloc ) sqlite3_str_reset(p);
+ if( eError==SQLITE_TOOBIG ) sqlite3ErrorToParser(p->db, eError);
+}
+
+/*
+** Extra argument values from a PrintfArguments object
+*/
+static sqlite3_int64 getIntArg(PrintfArguments *p){
+ if( p->nArg<=p->nUsed ) return 0;
+ return sqlite3_value_int64(p->apArg[p->nUsed++]);
+}
+static double getDoubleArg(PrintfArguments *p){
+ if( p->nArg<=p->nUsed ) return 0.0;
+ return sqlite3_value_double(p->apArg[p->nUsed++]);
+}
+static char *getTextArg(PrintfArguments *p){
+ if( p->nArg<=p->nUsed ) return 0;
+ return (char*)sqlite3_value_text(p->apArg[p->nUsed++]);
+}
+
+/*
+** Allocate memory for a temporary buffer needed for printf rendering.
+**
+** If the requested size of the temp buffer is larger than the size
+** of the output buffer in pAccum, then cause an SQLITE_TOOBIG error.
+** Do the size check before the memory allocation to prevent rogue
+** SQL from requesting large allocations using the precision or width
+** field of the printf() function.
+*/
+static char *printfTempBuf(sqlite3_str *pAccum, sqlite3_int64 n){
+ char *z;
+ if( pAccum->accError ) return 0;
+ if( n>pAccum->nAlloc && n>pAccum->mxAlloc ){
+ sqlite3StrAccumSetError(pAccum, SQLITE_TOOBIG);
+ return 0;
+ }
+ z = sqlite3DbMallocRaw(pAccum->db, n);
+ if( z==0 ){
+ sqlite3StrAccumSetError(pAccum, SQLITE_NOMEM);
+ }
+ return z;
+}
+
+/*
+** On machines with a small stack size, you can redefine the
+** SQLITE_PRINT_BUF_SIZE to be something smaller, if desired.
+*/
+#ifndef SQLITE_PRINT_BUF_SIZE
+# define SQLITE_PRINT_BUF_SIZE 70
+#endif
+#define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */
+
+/*
+** Hard limit on the precision of floating-point conversions.
+*/
+#ifndef SQLITE_PRINTF_PRECISION_LIMIT
+# define SQLITE_FP_PRECISION_LIMIT 100000000
+#endif
+
+/*
+** Render a string given by "fmt" into the StrAccum object.
+*/
+void sqlite3_str_vappendf(
+ sqlite3_str *pAccum, /* Accumulate results here */
+ const char *fmt, /* Format string */
+ va_list ap /* arguments */
+){
+ int c; /* Next character in the format string */
+ char *bufpt; /* Pointer to the conversion buffer */
+ int precision; /* Precision of the current field */
+ int length; /* Length of the field */
+ int idx; /* A general purpose loop counter */
+ int width; /* Width of the current field */
+ etByte flag_leftjustify; /* True if "-" flag is present */
+ etByte flag_prefix; /* '+' or ' ' or 0 for prefix */
+ etByte flag_alternateform; /* True if "#" flag is present */
+ etByte flag_altform2; /* True if "!" flag is present */
+ etByte flag_zeropad; /* True if field width constant starts with zero */
+ etByte flag_long; /* 1 for the "l" flag, 2 for "ll", 0 by default */
+ etByte done; /* Loop termination flag */
+ etByte cThousand; /* Thousands separator for %d and %u */
+ etByte xtype = etINVALID; /* Conversion paradigm */
+ u8 bArgList; /* True for SQLITE_PRINTF_SQLFUNC */
+ char prefix; /* Prefix character. "+" or "-" or " " or '\0'. */
+ sqlite_uint64 longvalue; /* Value for integer types */
+ double realvalue; /* Value for real types */
+ const et_info *infop; /* Pointer to the appropriate info structure */
+ char *zOut; /* Rendering buffer */
+ int nOut; /* Size of the rendering buffer */
+ char *zExtra = 0; /* Malloced memory used by some conversion */
+ int exp, e2; /* exponent of real numbers */
+ etByte flag_dp; /* True if decimal point should be shown */
+ etByte flag_rtz; /* True if trailing zeros should be removed */
+
+ PrintfArguments *pArgList = 0; /* Arguments for SQLITE_PRINTF_SQLFUNC */
+ char buf[etBUFSIZE]; /* Conversion buffer */
+
+ /* pAccum never starts out with an empty buffer that was obtained from
+ ** malloc(). This precondition is required by the mprintf("%z...")
+ ** optimization. */
+ assert( pAccum->nChar>0 || (pAccum->printfFlags&SQLITE_PRINTF_MALLOCED)==0 );
+
+ bufpt = 0;
+ if( (pAccum->printfFlags & SQLITE_PRINTF_SQLFUNC)!=0 ){
+ pArgList = va_arg(ap, PrintfArguments*);
+ bArgList = 1;
+ }else{
+ bArgList = 0;
+ }
+ for(; (c=(*fmt))!=0; ++fmt){
+ if( c!='%' ){
+ bufpt = (char *)fmt;
+#if HAVE_STRCHRNUL
+ fmt = strchrnul(fmt, '%');
+#else
+ do{ fmt++; }while( *fmt && *fmt != '%' );
+#endif
+ sqlite3_str_append(pAccum, bufpt, (int)(fmt - bufpt));
+ if( *fmt==0 ) break;
+ }
+ if( (c=(*++fmt))==0 ){
+ sqlite3_str_append(pAccum, "%", 1);
+ break;
+ }
+ /* Find out what flags are present */
+ flag_leftjustify = flag_prefix = cThousand =
+ flag_alternateform = flag_altform2 = flag_zeropad = 0;
+ done = 0;
+ width = 0;
+ flag_long = 0;
+ precision = -1;
+ do{
+ switch( c ){
+ case '-': flag_leftjustify = 1; break;
+ case '+': flag_prefix = '+'; break;
+ case ' ': flag_prefix = ' '; break;
+ case '#': flag_alternateform = 1; break;
+ case '!': flag_altform2 = 1; break;
+ case '0': flag_zeropad = 1; break;
+ case ',': cThousand = ','; break;
+ default: done = 1; break;
+ case 'l': {
+ flag_long = 1;
+ c = *++fmt;
+ if( c=='l' ){
+ c = *++fmt;
+ flag_long = 2;
+ }
+ done = 1;
+ break;
+ }
+ case '1': case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9': {
+ unsigned wx = c - '0';
+ while( (c = *++fmt)>='0' && c<='9' ){
+ wx = wx*10 + c - '0';
+ }
+ testcase( wx>0x7fffffff );
+ width = wx & 0x7fffffff;
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+ if( width>SQLITE_PRINTF_PRECISION_LIMIT ){
+ width = SQLITE_PRINTF_PRECISION_LIMIT;
+ }
+#endif
+ if( c!='.' && c!='l' ){
+ done = 1;
+ }else{
+ fmt--;
+ }
+ break;
+ }
+ case '*': {
+ if( bArgList ){
+ width = (int)getIntArg(pArgList);
+ }else{
+ width = va_arg(ap,int);
+ }
+ if( width<0 ){
+ flag_leftjustify = 1;
+ width = width >= -2147483647 ? -width : 0;
+ }
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+ if( width>SQLITE_PRINTF_PRECISION_LIMIT ){
+ width = SQLITE_PRINTF_PRECISION_LIMIT;
+ }
+#endif
+ if( (c = fmt[1])!='.' && c!='l' ){
+ c = *++fmt;
+ done = 1;
+ }
+ break;
+ }
+ case '.': {
+ c = *++fmt;
+ if( c=='*' ){
+ if( bArgList ){
+ precision = (int)getIntArg(pArgList);
+ }else{
+ precision = va_arg(ap,int);
+ }
+ if( precision<0 ){
+ precision = precision >= -2147483647 ? -precision : -1;
+ }
+ c = *++fmt;
+ }else{
+ unsigned px = 0;
+ while( c>='0' && c<='9' ){
+ px = px*10 + c - '0';
+ c = *++fmt;
+ }
+ testcase( px>0x7fffffff );
+ precision = px & 0x7fffffff;
+ }
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+ if( precision>SQLITE_PRINTF_PRECISION_LIMIT ){
+ precision = SQLITE_PRINTF_PRECISION_LIMIT;
+ }
+#endif
+ if( c=='l' ){
+ --fmt;
+ }else{
+ done = 1;
+ }
+ break;
+ }
+ }
+ }while( !done && (c=(*++fmt))!=0 );
+
+ /* Fetch the info entry for the field */
+ infop = &fmtinfo[0];
+ xtype = etINVALID;
+ for(idx=0; idx<ArraySize(fmtinfo); idx++){
+ if( c==fmtinfo[idx].fmttype ){
+ infop = &fmtinfo[idx];
+ xtype = infop->type;
+ break;
+ }
+ }
+
+ /*
+ ** At this point, variables are initialized as follows:
+ **
+ ** flag_alternateform TRUE if a '#' is present.
+ ** flag_altform2 TRUE if a '!' is present.
+ ** flag_prefix '+' or ' ' or zero
+ ** flag_leftjustify TRUE if a '-' is present or if the
+ ** field width was negative.
+ ** flag_zeropad TRUE if the width began with 0.
+ ** flag_long 1 for "l", 2 for "ll"
+ ** width The specified field width. This is
+ ** always non-negative. Zero is the default.
+ ** precision The specified precision. The default
+ ** is -1.
+ ** xtype The class of the conversion.
+ ** infop Pointer to the appropriate info struct.
+ */
+ assert( width>=0 );
+ assert( precision>=(-1) );
+ switch( xtype ){
+ case etPOINTER:
+ flag_long = sizeof(char*)==sizeof(i64) ? 2 :
+ sizeof(char*)==sizeof(long int) ? 1 : 0;
+ /* no break */ deliberate_fall_through
+ case etORDINAL:
+ case etRADIX:
+ cThousand = 0;
+ /* no break */ deliberate_fall_through
+ case etDECIMAL:
+ if( infop->flags & FLAG_SIGNED ){
+ i64 v;
+ if( bArgList ){
+ v = getIntArg(pArgList);
+ }else if( flag_long ){
+ if( flag_long==2 ){
+ v = va_arg(ap,i64) ;
+ }else{
+ v = va_arg(ap,long int);
+ }
+ }else{
+ v = va_arg(ap,int);
+ }
+ if( v<0 ){
+ testcase( v==SMALLEST_INT64 );
+ testcase( v==(-1) );
+ longvalue = ~v;
+ longvalue++;
+ prefix = '-';
+ }else{
+ longvalue = v;
+ prefix = flag_prefix;
+ }
+ }else{
+ if( bArgList ){
+ longvalue = (u64)getIntArg(pArgList);
+ }else if( flag_long ){
+ if( flag_long==2 ){
+ longvalue = va_arg(ap,u64);
+ }else{
+ longvalue = va_arg(ap,unsigned long int);
+ }
+ }else{
+ longvalue = va_arg(ap,unsigned int);
+ }
+ prefix = 0;
+ }
+ if( longvalue==0 ) flag_alternateform = 0;
+ if( flag_zeropad && precision<width-(prefix!=0) ){
+ precision = width-(prefix!=0);
+ }
+ if( precision<etBUFSIZE-10-etBUFSIZE/3 ){
+ nOut = etBUFSIZE;
+ zOut = buf;
+ }else{
+ u64 n;
+ n = (u64)precision + 10;
+ if( cThousand ) n += precision/3;
+ zOut = zExtra = printfTempBuf(pAccum, n);
+ if( zOut==0 ) return;
+ nOut = (int)n;
+ }
+ bufpt = &zOut[nOut-1];
+ if( xtype==etORDINAL ){
+ static const char zOrd[] = "thstndrd";
+ int x = (int)(longvalue % 10);
+ if( x>=4 || (longvalue/10)%10==1 ){
+ x = 0;
+ }
+ *(--bufpt) = zOrd[x*2+1];
+ *(--bufpt) = zOrd[x*2];
+ }
+ {
+ const char *cset = &aDigits[infop->charset];
+ u8 base = infop->base;
+ do{ /* Convert to ascii */
+ *(--bufpt) = cset[longvalue%base];
+ longvalue = longvalue/base;
+ }while( longvalue>0 );
+ }
+ length = (int)(&zOut[nOut-1]-bufpt);
+ while( precision>length ){
+ *(--bufpt) = '0'; /* Zero pad */
+ length++;
+ }
+ if( cThousand ){
+ int nn = (length - 1)/3; /* Number of "," to insert */
+ int ix = (length - 1)%3 + 1;
+ bufpt -= nn;
+ for(idx=0; nn>0; idx++){
+ bufpt[idx] = bufpt[idx+nn];
+ ix--;
+ if( ix==0 ){
+ bufpt[++idx] = cThousand;
+ nn--;
+ ix = 3;
+ }
+ }
+ }
+ if( prefix ) *(--bufpt) = prefix; /* Add sign */
+ if( flag_alternateform && infop->prefix ){ /* Add "0" or "0x" */
+ const char *pre;
+ char x;
+ pre = &aPrefix[infop->prefix];
+ for(; (x=(*pre))!=0; pre++) *(--bufpt) = x;
+ }
+ length = (int)(&zOut[nOut-1]-bufpt);
+ break;
+ case etFLOAT:
+ case etEXP:
+ case etGENERIC: {
+ FpDecode s;
+ int iRound;
+ int j;
+
+ if( bArgList ){
+ realvalue = getDoubleArg(pArgList);
+ }else{
+ realvalue = va_arg(ap,double);
+ }
+ if( precision<0 ) precision = 6; /* Set default precision */
+#ifdef SQLITE_FP_PRECISION_LIMIT
+ if( precision>SQLITE_FP_PRECISION_LIMIT ){
+ precision = SQLITE_FP_PRECISION_LIMIT;
+ }
+#endif
+ if( xtype==etFLOAT ){
+ iRound = -precision;
+ }else if( xtype==etGENERIC ){
+ iRound = precision;
+ }else{
+ iRound = precision+1;
+ }
+ sqlite3FpDecode(&s, realvalue, iRound, flag_altform2 ? 26 : 16);
+ if( s.isSpecial ){
+ if( s.isSpecial==2 ){
+ bufpt = flag_zeropad ? "null" : "NaN";
+ length = sqlite3Strlen30(bufpt);
+ break;
+ }else if( flag_zeropad ){
+ s.z[0] = '9';
+ s.iDP = 1000;
+ s.n = 1;
+ }else{
+ memcpy(buf, "-Inf", 5);
+ bufpt = buf;
+ if( s.sign=='-' ){
+ /* no-op */
+ }else if( flag_prefix ){
+ buf[0] = flag_prefix;
+ }else{
+ bufpt++;
+ }
+ length = sqlite3Strlen30(bufpt);
+ break;
+ }
+ }
+ if( s.sign=='-' ){
+ prefix = '-';
+ }else{
+ prefix = flag_prefix;
+ }
+
+ exp = s.iDP-1;
+ if( xtype==etGENERIC && precision>0 ) precision--;
+
+ /*
+ ** If the field type is etGENERIC, then convert to either etEXP
+ ** or etFLOAT, as appropriate.
+ */
+ if( xtype==etGENERIC ){
+ flag_rtz = !flag_alternateform;
+ if( exp<-4 || exp>precision ){
+ xtype = etEXP;
+ }else{
+ precision = precision - exp;
+ xtype = etFLOAT;
+ }
+ }else{
+ flag_rtz = flag_altform2;
+ }
+ if( xtype==etEXP ){
+ e2 = 0;
+ }else{
+ e2 = s.iDP - 1;
+ }
+ bufpt = buf;
+ {
+ i64 szBufNeeded; /* Size of a temporary buffer needed */
+ szBufNeeded = MAX(e2,0)+(i64)precision+(i64)width+15;
+ if( cThousand && e2>0 ) szBufNeeded += (e2+2)/3;
+ if( szBufNeeded > etBUFSIZE ){
+ bufpt = zExtra = printfTempBuf(pAccum, szBufNeeded);
+ if( bufpt==0 ) return;
+ }
+ }
+ zOut = bufpt;
+ flag_dp = (precision>0 ?1:0) | flag_alternateform | flag_altform2;
+ /* The sign in front of the number */
+ if( prefix ){
+ *(bufpt++) = prefix;
+ }
+ /* Digits prior to the decimal point */
+ j = 0;
+ if( e2<0 ){
+ *(bufpt++) = '0';
+ }else{
+ for(; e2>=0; e2--){
+ *(bufpt++) = j<s.n ? s.z[j++] : '0';
+ if( cThousand && (e2%3)==0 && e2>1 ) *(bufpt++) = ',';
+ }
+ }
+ /* The decimal point */
+ if( flag_dp ){
+ *(bufpt++) = '.';
+ }
+ /* "0" digits after the decimal point but before the first
+ ** significant digit of the number */
+ for(e2++; e2<0 && precision>0; precision--, e2++){
+ *(bufpt++) = '0';
+ }
+ /* Significant digits after the decimal point */
+ while( (precision--)>0 ){
+ *(bufpt++) = j<s.n ? s.z[j++] : '0';
+ }
+ /* Remove trailing zeros and the "." if no digits follow the "." */
+ if( flag_rtz && flag_dp ){
+ while( bufpt[-1]=='0' ) *(--bufpt) = 0;
+ assert( bufpt>zOut );
+ if( bufpt[-1]=='.' ){
+ if( flag_altform2 ){
+ *(bufpt++) = '0';
+ }else{
+ *(--bufpt) = 0;
+ }
+ }
+ }
+ /* Add the "eNNN" suffix */
+ if( xtype==etEXP ){
+ exp = s.iDP - 1;
+ *(bufpt++) = aDigits[infop->charset];
+ if( exp<0 ){
+ *(bufpt++) = '-'; exp = -exp;
+ }else{
+ *(bufpt++) = '+';
+ }
+ if( exp>=100 ){
+ *(bufpt++) = (char)((exp/100)+'0'); /* 100's digit */
+ exp %= 100;
+ }
+ *(bufpt++) = (char)(exp/10+'0'); /* 10's digit */
+ *(bufpt++) = (char)(exp%10+'0'); /* 1's digit */
+ }
+ *bufpt = 0;
+
+ /* The converted number is in buf[] and zero terminated. Output it.
+ ** Note that the number is in the usual order, not reversed as with
+ ** integer conversions. */
+ length = (int)(bufpt-zOut);
+ bufpt = zOut;
+
+ /* Special case: Add leading zeros if the flag_zeropad flag is
+ ** set and we are not left justified */
+ if( flag_zeropad && !flag_leftjustify && length < width){
+ int i;
+ int nPad = width - length;
+ for(i=width; i>=nPad; i--){
+ bufpt[i] = bufpt[i-nPad];
+ }
+ i = prefix!=0;
+ while( nPad-- ) bufpt[i++] = '0';
+ length = width;
+ }
+ break;
+ }
+ case etSIZE:
+ if( !bArgList ){
+ *(va_arg(ap,int*)) = pAccum->nChar;
+ }
+ length = width = 0;
+ break;
+ case etPERCENT:
+ buf[0] = '%';
+ bufpt = buf;
+ length = 1;
+ break;
+ case etCHARX:
+ if( bArgList ){
+ bufpt = getTextArg(pArgList);
+ length = 1;
+ if( bufpt ){
+ buf[0] = c = *(bufpt++);
+ if( (c&0xc0)==0xc0 ){
+ while( length<4 && (bufpt[0]&0xc0)==0x80 ){
+ buf[length++] = *(bufpt++);
+ }
+ }
+ }else{
+ buf[0] = 0;
+ }
+ }else{
+ unsigned int ch = va_arg(ap,unsigned int);
+ if( ch<0x00080 ){
+ buf[0] = ch & 0xff;
+ length = 1;
+ }else if( ch<0x00800 ){
+ buf[0] = 0xc0 + (u8)((ch>>6)&0x1f);
+ buf[1] = 0x80 + (u8)(ch & 0x3f);
+ length = 2;
+ }else if( ch<0x10000 ){
+ buf[0] = 0xe0 + (u8)((ch>>12)&0x0f);
+ buf[1] = 0x80 + (u8)((ch>>6) & 0x3f);
+ buf[2] = 0x80 + (u8)(ch & 0x3f);
+ length = 3;
+ }else{
+ buf[0] = 0xf0 + (u8)((ch>>18) & 0x07);
+ buf[1] = 0x80 + (u8)((ch>>12) & 0x3f);
+ buf[2] = 0x80 + (u8)((ch>>6) & 0x3f);
+ buf[3] = 0x80 + (u8)(ch & 0x3f);
+ length = 4;
+ }
+ }
+ if( precision>1 ){
+ i64 nPrior = 1;
+ width -= precision-1;
+ if( width>1 && !flag_leftjustify ){
+ sqlite3_str_appendchar(pAccum, width-1, ' ');
+ width = 0;
+ }
+ sqlite3_str_append(pAccum, buf, length);
+ precision--;
+ while( precision > 1 ){
+ i64 nCopyBytes;
+ if( nPrior > precision-1 ) nPrior = precision - 1;
+ nCopyBytes = length*nPrior;
+ if( nCopyBytes + pAccum->nChar >= pAccum->nAlloc ){
+ sqlite3StrAccumEnlarge(pAccum, nCopyBytes);
+ }
+ if( pAccum->accError ) break;
+ sqlite3_str_append(pAccum,
+ &pAccum->zText[pAccum->nChar-nCopyBytes], nCopyBytes);
+ precision -= nPrior;
+ nPrior *= 2;
+ }
+ }
+ bufpt = buf;
+ flag_altform2 = 1;
+ goto adjust_width_for_utf8;
+ case etSTRING:
+ case etDYNSTRING:
+ if( bArgList ){
+ bufpt = getTextArg(pArgList);
+ xtype = etSTRING;
+ }else{
+ bufpt = va_arg(ap,char*);
+ }
+ if( bufpt==0 ){
+ bufpt = "";
+ }else if( xtype==etDYNSTRING ){
+ if( pAccum->nChar==0
+ && pAccum->mxAlloc
+ && width==0
+ && precision<0
+ && pAccum->accError==0
+ ){
+ /* Special optimization for sqlite3_mprintf("%z..."):
+ ** Extend an existing memory allocation rather than creating
+ ** a new one. */
+ assert( (pAccum->printfFlags&SQLITE_PRINTF_MALLOCED)==0 );
+ pAccum->zText = bufpt;
+ pAccum->nAlloc = sqlite3DbMallocSize(pAccum->db, bufpt);
+ pAccum->nChar = 0x7fffffff & (int)strlen(bufpt);
+ pAccum->printfFlags |= SQLITE_PRINTF_MALLOCED;
+ length = 0;
+ break;
+ }
+ zExtra = bufpt;
+ }
+ if( precision>=0 ){
+ if( flag_altform2 ){
+ /* Set length to the number of bytes needed in order to display
+ ** precision characters */
+ unsigned char *z = (unsigned char*)bufpt;
+ while( precision-- > 0 && z[0] ){
+ SQLITE_SKIP_UTF8(z);
+ }
+ length = (int)(z - (unsigned char*)bufpt);
+ }else{
+ for(length=0; length<precision && bufpt[length]; length++){}
+ }
+ }else{
+ length = 0x7fffffff & (int)strlen(bufpt);
+ }
+ adjust_width_for_utf8:
+ if( flag_altform2 && width>0 ){
+ /* Adjust width to account for extra bytes in UTF-8 characters */
+ int ii = length - 1;
+ while( ii>=0 ) if( (bufpt[ii--] & 0xc0)==0x80 ) width++;
+ }
+ break;
+ case etSQLESCAPE: /* %q: Escape ' characters */
+ case etSQLESCAPE2: /* %Q: Escape ' and enclose in '...' */
+ case etSQLESCAPE3: { /* %w: Escape " characters */
+ i64 i, j, k, n;
+ int needQuote, isnull;
+ char ch;
+ char q = ((xtype==etSQLESCAPE3)?'"':'\''); /* Quote character */
+ char *escarg;
+
+ if( bArgList ){
+ escarg = getTextArg(pArgList);
+ }else{
+ escarg = va_arg(ap,char*);
+ }
+ isnull = escarg==0;
+ if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)");
+ /* For %q, %Q, and %w, the precision is the number of bytes (or
+ ** characters if the ! flags is present) to use from the input.
+ ** Because of the extra quoting characters inserted, the number
+ ** of output characters may be larger than the precision.
+ */
+ k = precision;
+ for(i=n=0; k!=0 && (ch=escarg[i])!=0; i++, k--){
+ if( ch==q ) n++;
+ if( flag_altform2 && (ch&0xc0)==0xc0 ){
+ while( (escarg[i+1]&0xc0)==0x80 ){ i++; }
+ }
+ }
+ needQuote = !isnull && xtype==etSQLESCAPE2;
+ n += i + 3;
+ if( n>etBUFSIZE ){
+ bufpt = zExtra = printfTempBuf(pAccum, n);
+ if( bufpt==0 ) return;
+ }else{
+ bufpt = buf;
+ }
+ j = 0;
+ if( needQuote ) bufpt[j++] = q;
+ k = i;
+ for(i=0; i<k; i++){
+ bufpt[j++] = ch = escarg[i];
+ if( ch==q ) bufpt[j++] = ch;
+ }
+ if( needQuote ) bufpt[j++] = q;
+ bufpt[j] = 0;
+ length = j;
+ goto adjust_width_for_utf8;
+ }
+ case etTOKEN: {
+ if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;
+ if( flag_alternateform ){
+ /* %#T means an Expr pointer that uses Expr.u.zToken */
+ Expr *pExpr = va_arg(ap,Expr*);
+ if( ALWAYS(pExpr) && ALWAYS(!ExprHasProperty(pExpr,EP_IntValue)) ){
+ sqlite3_str_appendall(pAccum, (const char*)pExpr->u.zToken);
+ sqlite3RecordErrorOffsetOfExpr(pAccum->db, pExpr);
+ }
+ }else{
+ /* %T means a Token pointer */
+ Token *pToken = va_arg(ap, Token*);
+ assert( bArgList==0 );
+ if( pToken && pToken->n ){
+ sqlite3_str_append(pAccum, (const char*)pToken->z, pToken->n);
+ sqlite3RecordErrorByteOffset(pAccum->db, pToken->z);
+ }
+ }
+ length = width = 0;
+ break;
+ }
+ case etSRCITEM: {
+ SrcItem *pItem;
+ if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;
+ pItem = va_arg(ap, SrcItem*);
+ assert( bArgList==0 );
+ if( pItem->zAlias && !flag_altform2 ){
+ sqlite3_str_appendall(pAccum, pItem->zAlias);
+ }else if( pItem->zName ){
+ if( pItem->zDatabase ){
+ sqlite3_str_appendall(pAccum, pItem->zDatabase);
+ sqlite3_str_append(pAccum, ".", 1);
+ }
+ sqlite3_str_appendall(pAccum, pItem->zName);
+ }else if( pItem->zAlias ){
+ sqlite3_str_appendall(pAccum, pItem->zAlias);
+ }else{
+ Select *pSel = pItem->pSelect;
+ assert( pSel!=0 );
+ if( pSel->selFlags & SF_NestedFrom ){
+ sqlite3_str_appendf(pAccum, "(join-%u)", pSel->selId);
+ }else{
+ sqlite3_str_appendf(pAccum, "(subquery-%u)", pSel->selId);
+ }
+ }
+ length = width = 0;
+ break;
+ }
+ default: {
+ assert( xtype==etINVALID );
+ return;
+ }
+ }/* End switch over the format type */
+ /*
+ ** The text of the conversion is pointed to by "bufpt" and is
+ ** "length" characters long. The field width is "width". Do
+ ** the output. Both length and width are in bytes, not characters,
+ ** at this point. If the "!" flag was present on string conversions
+ ** indicating that width and precision should be expressed in characters,
+ ** then the values have been translated prior to reaching this point.
+ */
+ width -= length;
+ if( width>0 ){
+ if( !flag_leftjustify ) sqlite3_str_appendchar(pAccum, width, ' ');
+ sqlite3_str_append(pAccum, bufpt, length);
+ if( flag_leftjustify ) sqlite3_str_appendchar(pAccum, width, ' ');
+ }else{
+ sqlite3_str_append(pAccum, bufpt, length);
+ }
+
+ if( zExtra ){
+ sqlite3DbFree(pAccum->db, zExtra);
+ zExtra = 0;
+ }
+ }/* End for loop over the format string */
+} /* End of function */
+
+
+/*
+** The z string points to the first character of a token that is
+** associated with an error. If db does not already have an error
+** byte offset recorded, try to compute the error byte offset for
+** z and set the error byte offset in db.
+*/
+void sqlite3RecordErrorByteOffset(sqlite3 *db, const char *z){
+ const Parse *pParse;
+ const char *zText;
+ const char *zEnd;
+ assert( z!=0 );
+ if( NEVER(db==0) ) return;
+ if( db->errByteOffset!=(-2) ) return;
+ pParse = db->pParse;
+ if( NEVER(pParse==0) ) return;
+ zText =pParse->zTail;
+ if( NEVER(zText==0) ) return;
+ zEnd = &zText[strlen(zText)];
+ if( SQLITE_WITHIN(z,zText,zEnd) ){
+ db->errByteOffset = (int)(z-zText);
+ }
+}
+
+/*
+** If pExpr has a byte offset for the start of a token, record that as
+** as the error offset.
+*/
+void sqlite3RecordErrorOffsetOfExpr(sqlite3 *db, const Expr *pExpr){
+ while( pExpr
+ && (ExprHasProperty(pExpr,EP_OuterON|EP_InnerON) || pExpr->w.iOfst<=0)
+ ){
+ pExpr = pExpr->pLeft;
+ }
+ if( pExpr==0 ) return;
+ db->errByteOffset = pExpr->w.iOfst;
+}
+
+/*
+** Enlarge the memory allocation on a StrAccum object so that it is
+** able to accept at least N more bytes of text.
+**
+** Return the number of bytes of text that StrAccum is able to accept
+** after the attempted enlargement. The value returned might be zero.
+*/
+int sqlite3StrAccumEnlarge(StrAccum *p, i64 N){
+ char *zNew;
+ assert( p->nChar+N >= p->nAlloc ); /* Only called if really needed */
+ if( p->accError ){
+ testcase(p->accError==SQLITE_TOOBIG);
+ testcase(p->accError==SQLITE_NOMEM);
+ return 0;
+ }
+ if( p->mxAlloc==0 ){
+ sqlite3StrAccumSetError(p, SQLITE_TOOBIG);
+ return p->nAlloc - p->nChar - 1;
+ }else{
+ char *zOld = isMalloced(p) ? p->zText : 0;
+ i64 szNew = p->nChar + N + 1;
+ if( szNew+p->nChar<=p->mxAlloc ){
+ /* Force exponential buffer size growth as long as it does not overflow,
+ ** to avoid having to call this routine too often */
+ szNew += p->nChar;
+ }
+ if( szNew > p->mxAlloc ){
+ sqlite3_str_reset(p);
+ sqlite3StrAccumSetError(p, SQLITE_TOOBIG);
+ return 0;
+ }else{
+ p->nAlloc = (int)szNew;
+ }
+ if( p->db ){
+ zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);
+ }else{
+ zNew = sqlite3Realloc(zOld, p->nAlloc);
+ }
+ if( zNew ){
+ assert( p->zText!=0 || p->nChar==0 );
+ if( !isMalloced(p) && p->nChar>0 ) memcpy(zNew, p->zText, p->nChar);
+ p->zText = zNew;
+ p->nAlloc = sqlite3DbMallocSize(p->db, zNew);
+ p->printfFlags |= SQLITE_PRINTF_MALLOCED;
+ }else{
+ sqlite3_str_reset(p);
+ sqlite3StrAccumSetError(p, SQLITE_NOMEM);
+ return 0;
+ }
+ }
+ assert( N>=0 && N<=0x7fffffff );
+ return (int)N;
+}
+
+/*
+** Append N copies of character c to the given string buffer.
+*/
+void sqlite3_str_appendchar(sqlite3_str *p, int N, char c){
+ testcase( p->nChar + (i64)N > 0x7fffffff );
+ if( p->nChar+(i64)N >= p->nAlloc && (N = sqlite3StrAccumEnlarge(p, N))<=0 ){
+ return;
+ }
+ while( (N--)>0 ) p->zText[p->nChar++] = c;
+}
+
+/*
+** The StrAccum "p" is not large enough to accept N new bytes of z[].
+** So enlarge if first, then do the append.
+**
+** This is a helper routine to sqlite3_str_append() that does special-case
+** work (enlarging the buffer) using tail recursion, so that the
+** sqlite3_str_append() routine can use fast calling semantics.
+*/
+static void SQLITE_NOINLINE enlargeAndAppend(StrAccum *p, const char *z, int N){
+ N = sqlite3StrAccumEnlarge(p, N);
+ if( N>0 ){
+ memcpy(&p->zText[p->nChar], z, N);
+ p->nChar += N;
+ }
+}
+
+/*
+** Append N bytes of text from z to the StrAccum object. Increase the
+** size of the memory allocation for StrAccum if necessary.
+*/
+void sqlite3_str_append(sqlite3_str *p, const char *z, int N){
+ assert( z!=0 || N==0 );
+ assert( p->zText!=0 || p->nChar==0 || p->accError );
+ assert( N>=0 );
+ assert( p->accError==0 || p->nAlloc==0 || p->mxAlloc==0 );
+ if( p->nChar+N >= p->nAlloc ){
+ enlargeAndAppend(p,z,N);
+ }else if( N ){
+ assert( p->zText );
+ p->nChar += N;
+ memcpy(&p->zText[p->nChar-N], z, N);
+ }
+}
+
+/*
+** Append the complete text of zero-terminated string z[] to the p string.
+*/
+void sqlite3_str_appendall(sqlite3_str *p, const char *z){
+ sqlite3_str_append(p, z, sqlite3Strlen30(z));
+}
+
+
+/*
+** Finish off a string by making sure it is zero-terminated.
+** Return a pointer to the resulting string. Return a NULL
+** pointer if any kind of error was encountered.
+*/
+static SQLITE_NOINLINE char *strAccumFinishRealloc(StrAccum *p){
+ char *zText;
+ assert( p->mxAlloc>0 && !isMalloced(p) );
+ zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
+ if( zText ){
+ memcpy(zText, p->zText, p->nChar+1);
+ p->printfFlags |= SQLITE_PRINTF_MALLOCED;
+ }else{
+ sqlite3StrAccumSetError(p, SQLITE_NOMEM);
+ }
+ p->zText = zText;
+ return zText;
+}
+char *sqlite3StrAccumFinish(StrAccum *p){
+ if( p->zText ){
+ p->zText[p->nChar] = 0;
+ if( p->mxAlloc>0 && !isMalloced(p) ){
+ return strAccumFinishRealloc(p);
+ }
+ }
+ return p->zText;
+}
+
+/*
+** Use the content of the StrAccum passed as the second argument
+** as the result of an SQL function.
+*/
+void sqlite3ResultStrAccum(sqlite3_context *pCtx, StrAccum *p){
+ if( p->accError ){
+ sqlite3_result_error_code(pCtx, p->accError);
+ sqlite3_str_reset(p);
+ }else if( isMalloced(p) ){
+ sqlite3_result_text(pCtx, p->zText, p->nChar, SQLITE_DYNAMIC);
+ }else{
+ sqlite3_result_text(pCtx, "", 0, SQLITE_STATIC);
+ sqlite3_str_reset(p);
+ }
+}
+
+/*
+** This singleton is an sqlite3_str object that is returned if
+** sqlite3_malloc() fails to provide space for a real one. This
+** sqlite3_str object accepts no new text and always returns
+** an SQLITE_NOMEM error.
+*/
+static sqlite3_str sqlite3OomStr = {
+ 0, 0, 0, 0, 0, SQLITE_NOMEM, 0
+};
+
+/* Finalize a string created using sqlite3_str_new().
+*/
+char *sqlite3_str_finish(sqlite3_str *p){
+ char *z;
+ if( p!=0 && p!=&sqlite3OomStr ){
+ z = sqlite3StrAccumFinish(p);
+ sqlite3_free(p);
+ }else{
+ z = 0;
+ }
+ return z;
+}
+
+/* Return any error code associated with p */
+int sqlite3_str_errcode(sqlite3_str *p){
+ return p ? p->accError : SQLITE_NOMEM;
+}
+
+/* Return the current length of p in bytes */
+int sqlite3_str_length(sqlite3_str *p){
+ return p ? p->nChar : 0;
+}
+
+/* Return the current value for p */
+char *sqlite3_str_value(sqlite3_str *p){
+ if( p==0 || p->nChar==0 ) return 0;
+ p->zText[p->nChar] = 0;
+ return p->zText;
+}
+
+/*
+** Reset an StrAccum string. Reclaim all malloced memory.
+*/
+void sqlite3_str_reset(StrAccum *p){
+ if( isMalloced(p) ){
+ sqlite3DbFree(p->db, p->zText);
+ p->printfFlags &= ~SQLITE_PRINTF_MALLOCED;
+ }
+ p->nAlloc = 0;
+ p->nChar = 0;
+ p->zText = 0;
+}
+
+/*
+** Initialize a string accumulator.
+**
+** p: The accumulator to be initialized.
+** db: Pointer to a database connection. May be NULL. Lookaside
+** memory is used if not NULL. db->mallocFailed is set appropriately
+** when not NULL.
+** zBase: An initial buffer. May be NULL in which case the initial buffer
+** is malloced.
+** n: Size of zBase in bytes. If total space requirements never exceed
+** n then no memory allocations ever occur.
+** mx: Maximum number of bytes to accumulate. If mx==0 then no memory
+** allocations will ever occur.
+*/
+void sqlite3StrAccumInit(StrAccum *p, sqlite3 *db, char *zBase, int n, int mx){
+ p->zText = zBase;
+ p->db = db;
+ p->nAlloc = n;
+ p->mxAlloc = mx;
+ p->nChar = 0;
+ p->accError = 0;
+ p->printfFlags = 0;
+}
+
+/* Allocate and initialize a new dynamic string object */
+sqlite3_str *sqlite3_str_new(sqlite3 *db){
+ sqlite3_str *p = sqlite3_malloc64(sizeof(*p));
+ if( p ){
+ sqlite3StrAccumInit(p, 0, 0, 0,
+ db ? db->aLimit[SQLITE_LIMIT_LENGTH] : SQLITE_MAX_LENGTH);
+ }else{
+ p = &sqlite3OomStr;
+ }
+ return p;
+}
+
+/*
+** Print into memory obtained from sqliteMalloc(). Use the internal
+** %-conversion extensions.
+*/
+char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){
+ char *z;
+ char zBase[SQLITE_PRINT_BUF_SIZE];
+ StrAccum acc;
+ assert( db!=0 );
+ sqlite3StrAccumInit(&acc, db, zBase, sizeof(zBase),
+ db->aLimit[SQLITE_LIMIT_LENGTH]);
+ acc.printfFlags = SQLITE_PRINTF_INTERNAL;
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ z = sqlite3StrAccumFinish(&acc);
+ if( acc.accError==SQLITE_NOMEM ){
+ sqlite3OomFault(db);
+ }
+ return z;
+}
+
+/*
+** Print into memory obtained from sqliteMalloc(). Use the internal
+** %-conversion extensions.
+*/
+char *sqlite3MPrintf(sqlite3 *db, const char *zFormat, ...){
+ va_list ap;
+ char *z;
+ va_start(ap, zFormat);
+ z = sqlite3VMPrintf(db, zFormat, ap);
+ va_end(ap);
+ return z;
+}
+
+/*
+** Print into memory obtained from sqlite3_malloc(). Omit the internal
+** %-conversion extensions.
+*/
+char *sqlite3_vmprintf(const char *zFormat, va_list ap){
+ char *z;
+ char zBase[SQLITE_PRINT_BUF_SIZE];
+ StrAccum acc;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+ if( zFormat==0 ){
+ (void)SQLITE_MISUSE_BKPT;
+ return 0;
+ }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+ if( sqlite3_initialize() ) return 0;
+#endif
+ sqlite3StrAccumInit(&acc, 0, zBase, sizeof(zBase), SQLITE_MAX_LENGTH);
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ z = sqlite3StrAccumFinish(&acc);
+ return z;
+}
+
+/*
+** Print into memory obtained from sqlite3_malloc()(). Omit the internal
+** %-conversion extensions.
+*/
+char *sqlite3_mprintf(const char *zFormat, ...){
+ va_list ap;
+ char *z;
+#ifndef SQLITE_OMIT_AUTOINIT
+ if( sqlite3_initialize() ) return 0;
+#endif
+ va_start(ap, zFormat);
+ z = sqlite3_vmprintf(zFormat, ap);
+ va_end(ap);
+ return z;
+}
+
+/*
+** sqlite3_snprintf() works like snprintf() except that it ignores the
+** current locale settings. This is important for SQLite because we
+** are not able to use a "," as the decimal point in place of "." as
+** specified by some locales.
+**
+** Oops: The first two arguments of sqlite3_snprintf() are backwards
+** from the snprintf() standard. Unfortunately, it is too late to change
+** this without breaking compatibility, so we just have to live with the
+** mistake.
+**
+** sqlite3_vsnprintf() is the varargs version.
+*/
+char *sqlite3_vsnprintf(int n, char *zBuf, const char *zFormat, va_list ap){
+ StrAccum acc;
+ if( n<=0 ) return zBuf;
+#ifdef SQLITE_ENABLE_API_ARMOR
+ if( zBuf==0 || zFormat==0 ) {
+ (void)SQLITE_MISUSE_BKPT;
+ if( zBuf ) zBuf[0] = 0;
+ return zBuf;
+ }
+#endif
+ sqlite3StrAccumInit(&acc, 0, zBuf, n, 0);
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ zBuf[acc.nChar] = 0;
+ return zBuf;
+}
+char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){
+ StrAccum acc;
+ va_list ap;
+ if( n<=0 ) return zBuf;
+#ifdef SQLITE_ENABLE_API_ARMOR
+ if( zBuf==0 || zFormat==0 ) {
+ (void)SQLITE_MISUSE_BKPT;
+ if( zBuf ) zBuf[0] = 0;
+ return zBuf;
+ }
+#endif
+ sqlite3StrAccumInit(&acc, 0, zBuf, n, 0);
+ va_start(ap,zFormat);
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ va_end(ap);
+ zBuf[acc.nChar] = 0;
+ return zBuf;
+}
+
+/*
+** This is the routine that actually formats the sqlite3_log() message.
+** We house it in a separate routine from sqlite3_log() to avoid using
+** stack space on small-stack systems when logging is disabled.
+**
+** sqlite3_log() must render into a static buffer. It cannot dynamically
+** allocate memory because it might be called while the memory allocator
+** mutex is held.
+**
+** sqlite3_str_vappendf() might ask for *temporary* memory allocations for
+** certain format characters (%q) or for very large precisions or widths.
+** Care must be taken that any sqlite3_log() calls that occur while the
+** memory mutex is held do not use these mechanisms.
+*/
+static void renderLogMsg(int iErrCode, const char *zFormat, va_list ap){
+ StrAccum acc; /* String accumulator */
+ char zMsg[SQLITE_PRINT_BUF_SIZE*3]; /* Complete log message */
+
+ sqlite3StrAccumInit(&acc, 0, zMsg, sizeof(zMsg), 0);
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ sqlite3GlobalConfig.xLog(sqlite3GlobalConfig.pLogArg, iErrCode,
+ sqlite3StrAccumFinish(&acc));
+}
+
+/*
+** Format and write a message to the log if logging is enabled.
+*/
+void sqlite3_log(int iErrCode, const char *zFormat, ...){
+ va_list ap; /* Vararg list */
+ if( sqlite3GlobalConfig.xLog ){
+ va_start(ap, zFormat);
+ renderLogMsg(iErrCode, zFormat, ap);
+ va_end(ap);
+ }
+}
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
+/*
+** A version of printf() that understands %lld. Used for debugging.
+** The printf() built into some versions of windows does not understand %lld
+** and segfaults if you give it a long long int.
+*/
+void sqlite3DebugPrintf(const char *zFormat, ...){
+ va_list ap;
+ StrAccum acc;
+ char zBuf[SQLITE_PRINT_BUF_SIZE*10];
+ sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+ va_start(ap,zFormat);
+ sqlite3_str_vappendf(&acc, zFormat, ap);
+ va_end(ap);
+ sqlite3StrAccumFinish(&acc);
+#ifdef SQLITE_OS_TRACE_PROC
+ {
+ extern void SQLITE_OS_TRACE_PROC(const char *zBuf, int nBuf);
+ SQLITE_OS_TRACE_PROC(zBuf, sizeof(zBuf));
+ }
+#else
+ fprintf(stdout,"%s", zBuf);
+ fflush(stdout);
+#endif
+}
+#endif
+
+
+/*
+** variable-argument wrapper around sqlite3_str_vappendf(). The bFlags argument
+** can contain the bit SQLITE_PRINTF_INTERNAL enable internal formats.
+*/
+void sqlite3_str_appendf(StrAccum *p, const char *zFormat, ...){
+ va_list ap;
+ va_start(ap,zFormat);
+ sqlite3_str_vappendf(p, zFormat, ap);
+ va_end(ap);
+}
+
+
+/*****************************************************************************
+** Reference counted string/blob storage
+*****************************************************************************/
+
+/*
+** Increase the reference count of the string by one.
+**
+** The input parameter is returned.
+*/
+char *sqlite3RCStrRef(char *z){
+ RCStr *p = (RCStr*)z;
+ assert( p!=0 );
+ p--;
+ p->nRCRef++;
+ return z;
+}
+
+/*
+** Decrease the reference count by one. Free the string when the
+** reference count reaches zero.
+*/
+void sqlite3RCStrUnref(void *z){
+ RCStr *p = (RCStr*)z;
+ assert( p!=0 );
+ p--;
+ assert( p->nRCRef>0 );
+ if( p->nRCRef>=2 ){
+ p->nRCRef--;
+ }else{
+ sqlite3_free(p);
+ }
+}
+
+/*
+** Create a new string that is capable of holding N bytes of text, not counting
+** the zero byte at the end. The string is uninitialized.
+**
+** The reference count is initially 1. Call sqlite3RCStrUnref() to free the
+** newly allocated string.
+**
+** This routine returns 0 on an OOM.
+*/
+char *sqlite3RCStrNew(u64 N){
+ RCStr *p = sqlite3_malloc64( N + sizeof(*p) + 1 );
+ if( p==0 ) return 0;
+ p->nRCRef = 1;
+ return (char*)&p[1];
+}
+
+/*
+** Change the size of the string so that it is able to hold N bytes.
+** The string might be reallocated, so return the new allocation.
+*/
+char *sqlite3RCStrResize(char *z, u64 N){
+ RCStr *p = (RCStr*)z;
+ RCStr *pNew;
+ assert( p!=0 );
+ p--;
+ assert( p->nRCRef==1 );
+ pNew = sqlite3_realloc64(p, N+sizeof(RCStr)+1);
+ if( pNew==0 ){
+ sqlite3_free(p);
+ return 0;
+ }else{
+ return (char*)&pNew[1];
+ }
+}