sqlcipher/src/printf.c at master · CoderLawrence/sqlcipher · GitHub

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** 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 etSRCLIST 12 /* a pointer to a SrcList */

#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, etSRCLIST, 0, 0 },

{ 'r', 10, 1, etORDINAL, 0, 0 },

};

** If SQLITE_OMIT_FLOATING_POINT is defined, then none of the floating point

** conversions will work.

#ifndef SQLITE_OMIT_FLOATING_POINT

** "*val" is a double such that 0.1 <= *val < 10.0

** Return the ascii code for the leading digit of *val, then

** multiply "*val" by 10.0 to renormalize.

** Example:

** input: *val = 3.14159

** output: *val = 1.4159 function return = '3'

** The counter *cnt is incremented each time. After counter exceeds

** 16 (the number of significant digits in a 64-bit float) '0' is

** always returned.

static char et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){

int digit;

LONGDOUBLE_TYPE d;

if( (*cnt)<=0 ) return '0';

(*cnt)--;

digit = (int)*val;

d = digit;

digit += '0';

*val = (*val - d)*10.0;

return (char)digit;

}

#endif /* SQLITE_OMIT_FLOATING_POINT */

** Set the StrAccum object to an error mode.

static void setStrAccumError(StrAccum *p, u8 eError){

assert( eError==STRACCUM_NOMEM || eError==STRACCUM_TOOBIG );

p->accError = eError;

p->nAlloc = 0;

}

** 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++]);

}

** 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 */

** Render a string given by "fmt" into the StrAccum object.

void sqlite3VXPrintf(

StrAccum *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 */

LONGDOUBLE_TYPE 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 */

#ifndef SQLITE_OMIT_FLOATING_POINT

int exp, e2; /* exponent of real numbers */

int nsd; /* Number of significant digits returned */

double rounder; /* Used for rounding floating point values */

etByte flag_dp; /* True if decimal point should be shown */

etByte flag_rtz; /* True if trailing zeros should be removed */

#endif

PrintfArguments *pArgList = 0; /* Arguments for SQLITE_PRINTF_SQLFUNC */

char buf[etBUFSIZE]; /* Conversion buffer */

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

sqlite3StrAccumAppend(pAccum, bufpt, (int)(fmt - bufpt));

if( *fmt==0 ) break;

}

if( (c=(*++fmt))==0 ){

sqlite3StrAccumAppend(pAccum, "%", 1);

break;

}

/* Find out what flags are present */

flag_leftjustify = flag_prefix = cThousand =

flag_alternateform = flag_altform2 = flag_zeropad = 0;

done = 0;

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;

}

}while( !done && (c=(*++fmt))!=0 );

/* Get the field width */

if( c=='*' ){

if( bArgList ){

width = (int)getIntArg(pArgList);

}else{

width = va_arg(ap,int);

}

if( width<0 ){

flag_leftjustify = 1;

width = width >= -2147483647 ? -width : 0;

}

c = *++fmt;

}else{

unsigned wx = 0;

while( c>='0' && c<='9' ){

wx = wx*10 + c - '0';

c = *++fmt;

}

testcase( wx>0x7fffffff );

width = wx & 0x7fffffff;

}

assert( width>=0 );

#ifdef SQLITE_PRINTF_PRECISION_LIMIT

if( width>SQLITE_PRINTF_PRECISION_LIMIT ){

width = SQLITE_PRINTF_PRECISION_LIMIT;

}

#endif

/* Get the precision */

if( c=='.' ){

c = *++fmt;

if( c=='*' ){

if( bArgList ){

precision = (int)getIntArg(pArgList);

}else{

precision = va_arg(ap,int);

}

c = *++fmt;

if( precision<0 ){

precision = precision >= -2147483647 ? -precision : -1;

}

}else{

unsigned px = 0;

while( c>='0' && c<='9' ){

px = px*10 + c - '0';

c = *++fmt;

}

testcase( px>0x7fffffff );

precision = px & 0x7fffffff;

}

}else{

precision = -1;

}

assert( precision>=(-1) );

#ifdef SQLITE_PRINTF_PRECISION_LIMIT

if( precision>SQLITE_PRINTF_PRECISION_LIMIT ){

precision = SQLITE_PRINTF_PRECISION_LIMIT;

}

#endif

/* Get the conversion type modifier */

if( c=='l' ){

flag_long = 1;

c = *++fmt;

if( c=='l' ){

flag_long = 2;

c = *++fmt;

}

}else{

flag_long = 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.

switch( xtype ){

case etPOINTER:

flag_long = sizeof(char*)==sizeof(i64) ? 2 :

sizeof(char*)==sizeof(long int) ? 1 : 0;

/* Fall through into the next case */

case etORDINAL:

case etRADIX:

cThousand = 0;

/* Fall through into the next case */

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 ){

if( v==SMALLEST_INT64 ){

longvalue = ((u64)1)<<63;

}else{

longvalue = -v;

}

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 = (u64)precision + 10 + precision/3;

zOut = zExtra = sqlite3Malloc( n );

if( zOut==0 ){

setStrAccumError(pAccum, STRACCUM_NOMEM);

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:

if( bArgList ){

realvalue = getDoubleArg(pArgList);

}else{

realvalue = va_arg(ap,double);

}

#ifdef SQLITE_OMIT_FLOATING_POINT

length = 0;

#else

if( precision<0 ) precision = 6; /* Set default precision */

if( realvalue<0.0 ){

realvalue = -realvalue;

prefix = '-';

}else{

prefix = flag_prefix;

}

if( xtype==etGENERIC && precision>0 ) precision--;

testcase( precision>0xfff );

for(idx=precision&0xfff, rounder=0.5; idx>0; idx--, rounder*=0.1){}

if( xtype==etFLOAT ) realvalue += rounder;

/* Normalize realvalue to within 10.0 > realvalue >= 1.0 */

exp = 0;

if( sqlite3IsNaN((double)realvalue) ){

bufpt = "NaN";

length = 3;

break;

}

if( realvalue>0.0 ){

LONGDOUBLE_TYPE scale = 1.0;

while( realvalue>=1e100*scale && exp<=350 ){ scale *= 1e100;exp+=100;}

while( realvalue>=1e10*scale && exp<=350 ){ scale *= 1e10; exp+=10; }

while( realvalue>=10.0*scale && exp<=350 ){ scale *= 10.0; exp++; }

realvalue /= scale;

while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; }

while( realvalue<1.0 ){ realvalue *= 10.0; exp--; }

if( exp>350 ){

bufpt = buf;

buf[0] = prefix;

memcpy(buf+(prefix!=0),"Inf",4);

length = 3+(prefix!=0);

break;

}

bufpt = buf;

** If the field type is etGENERIC, then convert to either etEXP

** or etFLOAT, as appropriate.

if( xtype!=etFLOAT ){

realvalue += rounder;

if( realvalue>=10.0 ){ realvalue *= 0.1; exp++; }

}

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 = exp;

}

if( MAX(e2,0)+(i64)precision+(i64)width > etBUFSIZE - 15 ){

bufpt = zExtra

= sqlite3Malloc( MAX(e2,0)+(i64)precision+(i64)width+15 );

if( bufpt==0 ){

setStrAccumError(pAccum, STRACCUM_NOMEM);

return;

}

zOut = bufpt;

nsd = 16 + flag_altform2*10;

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 */

if( e2<0 ){

*(bufpt++) = '0';

}else{

for(; e2>=0; e2--){

*(bufpt++) = et_getdigit(&realvalue,&nsd);

}

/* 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--, e2++){

assert( precision>0 );

*(bufpt++) = '0';

}

/* Significant digits after the decimal point */

while( (precision--)>0 ){

*(bufpt++) = et_getdigit(&realvalue,&nsd);

}

/* 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 ){

*(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;

}

#endif /* !defined(SQLITE_OMIT_FLOATING_POINT) */

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);

c = bufpt ? bufpt[0] : 0;

}else{

c = va_arg(ap,int);

}

if( precision>1 ){

width -= precision-1;

if( width>1 && !flag_leftjustify ){

sqlite3AppendChar(pAccum, width-1, ' ');

width = 0;

}

sqlite3AppendChar(pAccum, precision-1, c);

}

length = 1;

buf[0] = c;

bufpt = buf;

break;

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 ){

zExtra = bufpt;

}

if( precision>=0 ){

for(length=0; length<precision && bufpt[length]; length++){}

}else{

length = sqlite3Strlen30(bufpt);

}

break;

case etSQLESCAPE: /* Escape ' characters */

case etSQLESCAPE2: /* Escape ' and enclose in '...' */

case etSQLESCAPE3: { /* Escape " characters */

int i, j, k, n, isnull;

int needQuote;

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)");

k = precision;

for(i=n=0; k!=0 && (ch=escarg[i])!=0; i++, k--){

if( ch==q ) n++;

}

needQuote = !isnull && xtype==etSQLESCAPE2;

n += i + 3;

if( n>etBUFSIZE ){

bufpt = zExtra = sqlite3Malloc( n );

if( bufpt==0 ){

setStrAccumError(pAccum, STRACCUM_NOMEM);

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;

/* The precision in %q and %Q means how many input characters to

** consume, not the length of the output...

** if( precision>=0 && precision<length ) length = precision; */

break;

}

case etTOKEN: {

Token *pToken;

if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;

pToken = va_arg(ap, Token*);

assert( bArgList==0 );

if( pToken && pToken->n ){

sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n);

}

length = width = 0;

break;

}

case etSRCLIST: {

SrcList *pSrc;

int k;

struct SrcList_item *pItem;

if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;

pSrc = va_arg(ap, SrcList*);

k = va_arg(ap, int);

pItem = &pSrc->a[k];

assert( bArgList==0 );

assert( k>=0 && k<pSrc->nSrc );

if( pItem->zDatabase ){

sqlite3StrAccumAppendAll(pAccum, pItem->zDatabase);

sqlite3StrAccumAppend(pAccum, ".", 1);

}

sqlite3StrAccumAppendAll(pAccum, pItem->zName);

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.

width -= length;

if( width>0 ){

if( !flag_leftjustify ) sqlite3AppendChar(pAccum, width, ' ');

sqlite3StrAccumAppend(pAccum, bufpt, length);

if( flag_leftjustify ) sqlite3AppendChar(pAccum, width, ' ');

}else{

sqlite3StrAccumAppend(pAccum, bufpt, length);

}

if( zExtra ){

sqlite3DbFree(pAccum->db, zExtra);

zExtra = 0;

}

}/* End for loop over the format string */

} /* End of function */

** 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.

static int sqlite3StrAccumEnlarge(StrAccum *p, int N){

char *zNew;

assert( p->nChar+(i64)N >= p->nAlloc ); /* Only called if really needed */

if( p->accError ){

testcase(p->accError==STRACCUM_TOOBIG);

testcase(p->accError==STRACCUM_NOMEM);

return 0;

}

if( p->mxAlloc==0 ){

N = p->nAlloc - p->nChar - 1;

setStrAccumError(p, STRACCUM_TOOBIG);

return N;

}else{

char *zOld = isMalloced(p) ? p->zText : 0;

i64 szNew = p->nChar;

assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );

szNew += 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 ){

sqlite3StrAccumReset(p);

setStrAccumError(p, STRACCUM_TOOBIG);

return 0;

}else{

p->nAlloc = (int)szNew;

}

if( p->db ){

zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);

}else{

zNew = sqlite3_realloc64(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{

sqlite3StrAccumReset(p);

setStrAccumError(p, STRACCUM_NOMEM);

return 0;

}

return N;

}

** Append N copies of character c to the given string buffer.

void sqlite3AppendChar(StrAccum *p, int N, char c){

testcase( p->nChar + (i64)N > 0x7fffffff );

if( p->nChar+(i64)N >= p->nAlloc && (N = sqlite3StrAccumEnlarge(p, N))<=0 ){

return;

}

assert( (p->zText==p->zBase)==!isMalloced(p) );

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 sqlite3StrAccumAppend() that does special-case

** work (enlarging the buffer) using tail recursion, so that the

** sqlite3StrAccumAppend() 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;

}

assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );

}

** Append N bytes of text from z to the StrAccum object. Increase the

** size of the memory allocation for StrAccum if necessary.

void sqlite3StrAccumAppend(StrAccum *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 );

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 sqlite3StrAccumAppendAll(StrAccum *p, const char *z){

sqlite3StrAccumAppend(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){

assert( p->mxAlloc>0 && !isMalloced(p) );

p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );

if( p->zText ){

memcpy(p->zText, p->zBase, p->nChar+1);

p->printfFlags |= SQLITE_PRINTF_MALLOCED;

}else{

setStrAccumError(p, STRACCUM_NOMEM);

}

return p->zText;

}

char *sqlite3StrAccumFinish(StrAccum *p){

if( p->zText ){

assert( (p->zText==p->zBase)==!isMalloced(p) );

p->zText[p->nChar] = 0;

if( p->mxAlloc>0 && !isMalloced(p) ){

return strAccumFinishRealloc(p);

}

return p->zText;

}

** Reset an StrAccum string. Reclaim all malloced memory.

void sqlite3StrAccumReset(StrAccum *p){

assert( (p->zText==0 || p->zText==p->zBase)==!isMalloced(p) );

if( isMalloced(p) ){

sqlite3DbFree(p->db, p->zText);

p->printfFlags &= ~SQLITE_PRINTF_MALLOCED;

}

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 = p->zBase = zBase;

p->db = db;

p->nChar = 0;

p->nAlloc = n;

p->mxAlloc = mx;

p->accError = 0;

p->printfFlags = 0;

}

** 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;

sqlite3VXPrintf(&acc, zFormat, ap);

z = sqlite3StrAccumFinish(&acc);

if( acc.accError==STRACCUM_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);

sqlite3VXPrintf(&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;

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sqlcipher/src/printf.c at master · CoderLawrence/sqlcipher · GitHub

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