1 /* 2 ** The "printf" code that follows dates from the 1980's. It is in 3 ** the public domain. The original comments are included here for 4 ** completeness. They are very out-of-date but might be useful as 5 ** an historical reference. Most of the "enhancements" have been backed 6 ** out so that the functionality is now the same as standard printf(). 7 ** 8 ** $Id: printf.c,v 1.92 2008/07/15 00:27:35 drh Exp $ 9 ** 10 ************************************************************************** 11 ** 12 ** The following modules is an enhanced replacement for the "printf" subroutines 13 ** found in the standard C library. The following enhancements are 14 ** supported: 15 ** 16 ** + Additional functions. The standard set of "printf" functions 17 ** includes printf, fprintf, sprintf, vprintf, vfprintf, and 18 ** vsprintf. This module adds the following: 19 ** 20 ** * snprintf -- Works like sprintf, but has an extra argument 21 ** which is the size of the buffer written to. 22 ** 23 ** * mprintf -- Similar to sprintf. Writes output to memory 24 ** obtained from malloc. 25 ** 26 ** * xprintf -- Calls a function to dispose of output. 27 ** 28 ** * nprintf -- No output, but returns the number of characters 29 ** that would have been output by printf. 30 ** 31 ** * A v- version (ex: vsnprintf) of every function is also 32 ** supplied. 33 ** 34 ** + A few extensions to the formatting notation are supported: 35 ** 36 ** * The "=" flag (similar to "-") causes the output to be 37 ** be centered in the appropriately sized field. 38 ** 39 ** * The %b field outputs an integer in binary notation. 40 ** 41 ** * The %c field now accepts a precision. The character output 42 ** is repeated by the number of times the precision specifies. 43 ** 44 ** * The %' field works like %c, but takes as its character the 45 ** next character of the format string, instead of the next 46 ** argument. For example, printf("%.78'-") prints 78 minus 47 ** signs, the same as printf("%.78c",'-'). 48 ** 49 ** + When compiled using GCC on a SPARC, this version of printf is 50 ** faster than the library printf for SUN OS 4.1. 51 ** 52 ** + All functions are fully reentrant. 53 ** 54 */ 55 #include "sqliteInt.h" 56 57 /* 58 ** Conversion types fall into various categories as defined by the 59 ** following enumeration. 60 */ 61 #define etRADIX 1 /* Integer types. %d, %x, %o, and so forth */ 62 #define etFLOAT 2 /* Floating point. %f */ 63 #define etEXP 3 /* Exponentional notation. %e and %E */ 64 #define etGENERIC 4 /* Floating or exponential, depending on exponent. %g */ 65 #define etSIZE 5 /* Return number of characters processed so far. %n */ 66 #define etSTRING 6 /* Strings. %s */ 67 #define etDYNSTRING 7 /* Dynamically allocated strings. %z */ 68 #define etPERCENT 8 /* Percent symbol. %% */ 69 #define etCHARX 9 /* Characters. %c */ 70 /* The rest are extensions, not normally found in printf() */ 71 #define etSQLESCAPE 10 /* Strings with '\'' doubled. %q */ 72 #define etSQLESCAPE2 11 /* Strings with '\'' doubled and enclosed in '', 73 NULL pointers replaced by SQL NULL. %Q */ 74 #define etTOKEN 12 /* a pointer to a Token structure */ 75 #define etSRCLIST 13 /* a pointer to a SrcList */ 76 #define etPOINTER 14 /* The %p conversion */ 77 #define etSQLESCAPE3 15 /* %w -> Strings with '\"' doubled */ 78 #define etORDINAL 16 /* %r -> 1st, 2nd, 3rd, 4th, etc. English only */ 79 80 81 /* 82 ** An "etByte" is an 8-bit unsigned value. 83 */ 84 typedef unsigned char etByte; 85 86 /* 87 ** Each builtin conversion character (ex: the 'd' in "%d") is described 88 ** by an instance of the following structure 89 */ 90 typedef struct et_info { /* Information about each format field */ 91 char fmttype; /* The format field code letter */ 92 etByte base; /* The base for radix conversion */ 93 etByte flags; /* One or more of FLAG_ constants below */ 94 etByte type; /* Conversion paradigm */ 95 etByte charset; /* Offset into aDigits[] of the digits string */ 96 etByte prefix; /* Offset into aPrefix[] of the prefix string */ 97 } et_info; 98 99 /* 100 ** Allowed values for et_info.flags 101 */ 102 #define FLAG_SIGNED 1 /* True if the value to convert is signed */ 103 #define FLAG_INTERN 2 /* True if for internal use only */ 104 #define FLAG_STRING 4 /* Allow infinity precision */ 105 106 107 /* 108 ** The following table is searched linearly, so it is good to put the 109 ** most frequently used conversion types first. 110 */ 111 static const char aDigits[] = "0123456789ABCDEF0123456789abcdef"; 112 static const char aPrefix[] = "-x0\000X0"; 113 static const et_info fmtinfo[] = { 114 { 'd', 10, 1, etRADIX, 0, 0 }, 115 { 's', 0, 4, etSTRING, 0, 0 }, 116 { 'g', 0, 1, etGENERIC, 30, 0 }, 117 { 'z', 0, 4, etDYNSTRING, 0, 0 }, 118 { 'q', 0, 4, etSQLESCAPE, 0, 0 }, 119 { 'Q', 0, 4, etSQLESCAPE2, 0, 0 }, 120 { 'w', 0, 4, etSQLESCAPE3, 0, 0 }, 121 { 'c', 0, 0, etCHARX, 0, 0 }, 122 { 'o', 8, 0, etRADIX, 0, 2 }, 123 { 'u', 10, 0, etRADIX, 0, 0 }, 124 { 'x', 16, 0, etRADIX, 16, 1 }, 125 { 'X', 16, 0, etRADIX, 0, 4 }, 126 #ifndef SQLITE_OMIT_FLOATING_POINT 127 { 'f', 0, 1, etFLOAT, 0, 0 }, 128 { 'e', 0, 1, etEXP, 30, 0 }, 129 { 'E', 0, 1, etEXP, 14, 0 }, 130 { 'G', 0, 1, etGENERIC, 14, 0 }, 131 #endif 132 { 'i', 10, 1, etRADIX, 0, 0 }, 133 { 'n', 0, 0, etSIZE, 0, 0 }, 134 { '%', 0, 0, etPERCENT, 0, 0 }, 135 { 'p', 16, 0, etPOINTER, 0, 1 }, 136 { 'T', 0, 2, etTOKEN, 0, 0 }, 137 { 'S', 0, 2, etSRCLIST, 0, 0 }, 138 { 'r', 10, 3, etORDINAL, 0, 0 }, 139 }; 140 #define etNINFO (sizeof(fmtinfo)/sizeof(fmtinfo[0])) 141 142 /* 143 ** If SQLITE_OMIT_FLOATING_POINT is defined, then none of the floating point 144 ** conversions will work. 145 */ 146 #ifndef SQLITE_OMIT_FLOATING_POINT 147 /* 148 ** "*val" is a double such that 0.1 <= *val < 10.0 149 ** Return the ascii code for the leading digit of *val, then 150 ** multiply "*val" by 10.0 to renormalize. 151 ** 152 ** Example: 153 ** input: *val = 3.14159 154 ** output: *val = 1.4159 function return = '3' 155 ** 156 ** The counter *cnt is incremented each time. After counter exceeds 157 ** 16 (the number of significant digits in a 64-bit float) '0' is 158 ** always returned. 159 */ 160 static int et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){ 161 int digit; 162 LONGDOUBLE_TYPE d; 163 if( (*cnt)++ >= 16 ) return '0'; 164 digit = (int)*val; 165 d = digit; 166 digit += '0'; 167 *val = (*val - d)*10.0; 168 return digit; 169 } 170 #endif /* SQLITE_OMIT_FLOATING_POINT */ 171 172 /* 173 ** Append N space characters to the given string buffer. 174 */ 175 static void appendSpace(StrAccum *pAccum, int N){ 176 static const char zSpaces[] = " "; 177 while( N>=sizeof(zSpaces)-1 ){ 178 sqlite3StrAccumAppend(pAccum, zSpaces, sizeof(zSpaces)-1); 179 N -= sizeof(zSpaces)-1; 180 } 181 if( N>0 ){ 182 sqlite3StrAccumAppend(pAccum, zSpaces, N); 183 } 184 } 185 186 /* 187 ** On machines with a small stack size, you can redefine the 188 ** SQLITE_PRINT_BUF_SIZE to be less than 350. But beware - for 189 ** smaller values some %f conversions may go into an infinite loop. 190 */ 191 #ifndef SQLITE_PRINT_BUF_SIZE 192 # define SQLITE_PRINT_BUF_SIZE 350 193 #endif 194 #define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */ 195 196 /* 197 ** The root program. All variations call this core. 198 ** 199 ** INPUTS: 200 ** func This is a pointer to a function taking three arguments 201 ** 1. A pointer to anything. Same as the "arg" parameter. 202 ** 2. A pointer to the list of characters to be output 203 ** (Note, this list is NOT null terminated.) 204 ** 3. An integer number of characters to be output. 205 ** (Note: This number might be zero.) 206 ** 207 ** arg This is the pointer to anything which will be passed as the 208 ** first argument to "func". Use it for whatever you like. 209 ** 210 ** fmt This is the format string, as in the usual print. 211 ** 212 ** ap This is a pointer to a list of arguments. Same as in 213 ** vfprint. 214 ** 215 ** OUTPUTS: 216 ** The return value is the total number of characters sent to 217 ** the function "func". Returns -1 on a error. 218 ** 219 ** Note that the order in which automatic variables are declared below 220 ** seems to make a big difference in determining how fast this beast 221 ** will run. 222 */ 223 void sqlite3VXPrintf( 224 StrAccum *pAccum, /* Accumulate results here */ 225 int useExtended, /* Allow extended %-conversions */ 226 const char *fmt, /* Format string */ 227 va_list ap /* arguments */ 228 ){ 229 int c; /* Next character in the format string */ 230 char *bufpt; /* Pointer to the conversion buffer */ 231 int precision; /* Precision of the current field */ 232 int length; /* Length of the field */ 233 int idx; /* A general purpose loop counter */ 234 int width; /* Width of the current field */ 235 etByte flag_leftjustify; /* True if "-" flag is present */ 236 etByte flag_plussign; /* True if "+" flag is present */ 237 etByte flag_blanksign; /* True if " " flag is present */ 238 etByte flag_alternateform; /* True if "#" flag is present */ 239 etByte flag_altform2; /* True if "!" flag is present */ 240 etByte flag_zeropad; /* True if field width constant starts with zero */ 241 etByte flag_long; /* True if "l" flag is present */ 242 etByte flag_longlong; /* True if the "ll" flag is present */ 243 etByte done; /* Loop termination flag */ 244 sqlite_uint64 longvalue; /* Value for integer types */ 245 LONGDOUBLE_TYPE realvalue; /* Value for real types */ 246 const et_info *infop; /* Pointer to the appropriate info structure */ 247 char buf[etBUFSIZE]; /* Conversion buffer */ 248 char prefix; /* Prefix character. "+" or "-" or " " or '\0'. */ 249 etByte errorflag = 0; /* True if an error is encountered */ 250 etByte xtype; /* Conversion paradigm */ 251 char *zExtra; /* Extra memory used for etTCLESCAPE conversions */ 252 #ifndef SQLITE_OMIT_FLOATING_POINT 253 int exp, e2; /* exponent of real numbers */ 254 double rounder; /* Used for rounding floating point values */ 255 etByte flag_dp; /* True if decimal point should be shown */ 256 etByte flag_rtz; /* True if trailing zeros should be removed */ 257 etByte flag_exp; /* True to force display of the exponent */ 258 int nsd; /* Number of significant digits returned */ 259 #endif 260 261 length = 0; 262 bufpt = 0; 263 for(; (c=(*fmt))!=0; ++fmt){ 264 if( c!='%' ){ 265 int amt; 266 bufpt = (char *)fmt; 267 amt = 1; 268 while( (c=(*++fmt))!='%' && c!=0 ) amt++; 269 sqlite3StrAccumAppend(pAccum, bufpt, amt); 270 if( c==0 ) break; 271 } 272 if( (c=(*++fmt))==0 ){ 273 errorflag = 1; 274 sqlite3StrAccumAppend(pAccum, "%", 1); 275 break; 276 } 277 /* Find out what flags are present */ 278 flag_leftjustify = flag_plussign = flag_blanksign = 279 flag_alternateform = flag_altform2 = flag_zeropad = 0; 280 done = 0; 281 do{ 282 switch( c ){ 283 case '-': flag_leftjustify = 1; break; 284 case '+': flag_plussign = 1; break; 285 case ' ': flag_blanksign = 1; break; 286 case '#': flag_alternateform = 1; break; 287 case '!': flag_altform2 = 1; break; 288 case '0': flag_zeropad = 1; break; 289 default: done = 1; break; 290 } 291 }while( !done && (c=(*++fmt))!=0 ); 292 /* Get the field width */ 293 width = 0; 294 if( c=='*' ){ 295 width = va_arg(ap,int); 296 if( width<0 ){ 297 flag_leftjustify = 1; 298 width = -width; 299 } 300 c = *++fmt; 301 }else{ 302 while( c>='0' && c<='9' ){ 303 width = width*10 + c - '0'; 304 c = *++fmt; 305 } 306 } 307 if( width > etBUFSIZE-10 ){ 308 width = etBUFSIZE-10; 309 } 310 /* Get the precision */ 311 if( c=='.' ){ 312 precision = 0; 313 c = *++fmt; 314 if( c=='*' ){ 315 precision = va_arg(ap,int); 316 if( precision<0 ) precision = -precision; 317 c = *++fmt; 318 }else{ 319 while( c>='0' && c<='9' ){ 320 precision = precision*10 + c - '0'; 321 c = *++fmt; 322 } 323 } 324 }else{ 325 precision = -1; 326 } 327 /* Get the conversion type modifier */ 328 if( c=='l' ){ 329 flag_long = 1; 330 c = *++fmt; 331 if( c=='l' ){ 332 flag_longlong = 1; 333 c = *++fmt; 334 }else{ 335 flag_longlong = 0; 336 } 337 }else{ 338 flag_long = flag_longlong = 0; 339 } 340 /* Fetch the info entry for the field */ 341 infop = 0; 342 for(idx=0; idx<etNINFO; idx++){ 343 if( c==fmtinfo[idx].fmttype ){ 344 infop = &fmtinfo[idx]; 345 if( useExtended || (infop->flags & FLAG_INTERN)==0 ){ 346 xtype = infop->type; 347 }else{ 348 return; 349 } 350 break; 351 } 352 } 353 zExtra = 0; 354 if( infop==0 ){ 355 return; 356 } 357 358 359 /* Limit the precision to prevent overflowing buf[] during conversion */ 360 if( precision>etBUFSIZE-40 && (infop->flags & FLAG_STRING)==0 ){ 361 precision = etBUFSIZE-40; 362 } 363 364 /* 365 ** At this point, variables are initialized as follows: 366 ** 367 ** flag_alternateform TRUE if a '#' is present. 368 ** flag_altform2 TRUE if a '!' is present. 369 ** flag_plussign TRUE if a '+' is present. 370 ** flag_leftjustify TRUE if a '-' is present or if the 371 ** field width was negative. 372 ** flag_zeropad TRUE if the width began with 0. 373 ** flag_long TRUE if the letter 'l' (ell) prefixed 374 ** the conversion character. 375 ** flag_longlong TRUE if the letter 'll' (ell ell) prefixed 376 ** the conversion character. 377 ** flag_blanksign TRUE if a ' ' is present. 378 ** width The specified field width. This is 379 ** always non-negative. Zero is the default. 380 ** precision The specified precision. The default 381 ** is -1. 382 ** xtype The class of the conversion. 383 ** infop Pointer to the appropriate info struct. 384 */ 385 switch( xtype ){ 386 case etPOINTER: 387 flag_longlong = sizeof(char*)==sizeof(i64); 388 flag_long = sizeof(char*)==sizeof(long int); 389 /* Fall through into the next case */ 390 case etORDINAL: 391 case etRADIX: 392 if( infop->flags & FLAG_SIGNED ){ 393 i64 v; 394 if( flag_longlong ) v = va_arg(ap,i64); 395 else if( flag_long ) v = va_arg(ap,long int); 396 else v = va_arg(ap,int); 397 if( v<0 ){ 398 longvalue = -v; 399 prefix = '-'; 400 }else{ 401 longvalue = v; 402 if( flag_plussign ) prefix = '+'; 403 else if( flag_blanksign ) prefix = ' '; 404 else prefix = 0; 405 } 406 }else{ 407 if( flag_longlong ) longvalue = va_arg(ap,u64); 408 else if( flag_long ) longvalue = va_arg(ap,unsigned long int); 409 else longvalue = va_arg(ap,unsigned int); 410 prefix = 0; 411 } 412 if( longvalue==0 ) flag_alternateform = 0; 413 if( flag_zeropad && precision<width-(prefix!=0) ){ 414 precision = width-(prefix!=0); 415 } 416 bufpt = &buf[etBUFSIZE-1]; 417 if( xtype==etORDINAL ){ 418 static const char zOrd[] = "thstndrd"; 419 int x = longvalue % 10; 420 if( x>=4 || (longvalue/10)%10==1 ){ 421 x = 0; 422 } 423 buf[etBUFSIZE-3] = zOrd[x*2]; 424 buf[etBUFSIZE-2] = zOrd[x*2+1]; 425 bufpt -= 2; 426 } 427 { 428 register const char *cset; /* Use registers for speed */ 429 register int base; 430 cset = &aDigits[infop->charset]; 431 base = infop->base; 432 do{ /* Convert to ascii */ 433 *(--bufpt) = cset[longvalue%base]; 434 longvalue = longvalue/base; 435 }while( longvalue>0 ); 436 } 437 length = &buf[etBUFSIZE-1]-bufpt; 438 for(idx=precision-length; idx>0; idx--){ 439 *(--bufpt) = '0'; /* Zero pad */ 440 } 441 if( prefix ) *(--bufpt) = prefix; /* Add sign */ 442 if( flag_alternateform && infop->prefix ){ /* Add "0" or "0x" */ 443 const char *pre; 444 char x; 445 pre = &aPrefix[infop->prefix]; 446 for(; (x=(*pre))!=0; pre++) *(--bufpt) = x; 447 } 448 length = &buf[etBUFSIZE-1]-bufpt; 449 break; 450 case etFLOAT: 451 case etEXP: 452 case etGENERIC: 453 realvalue = va_arg(ap,double); 454 #ifndef SQLITE_OMIT_FLOATING_POINT 455 if( precision<0 ) precision = 6; /* Set default precision */ 456 if( precision>etBUFSIZE/2-10 ) precision = etBUFSIZE/2-10; 457 if( realvalue<0.0 ){ 458 realvalue = -realvalue; 459 prefix = '-'; 460 }else{ 461 if( flag_plussign ) prefix = '+'; 462 else if( flag_blanksign ) prefix = ' '; 463 else prefix = 0; 464 } 465 if( xtype==etGENERIC && precision>0 ) precision--; 466 #if 0 467 /* Rounding works like BSD when the constant 0.4999 is used. Wierd! */ 468 for(idx=precision, rounder=0.4999; idx>0; idx--, rounder*=0.1); 469 #else 470 /* It makes more sense to use 0.5 */ 471 for(idx=precision, rounder=0.5; idx>0; idx--, rounder*=0.1){} 472 #endif 473 if( xtype==etFLOAT ) realvalue += rounder; 474 /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */ 475 exp = 0; 476 if( sqlite3IsNaN(realvalue) ){ 477 bufpt = "NaN"; 478 length = 3; 479 break; 480 } 481 if( realvalue>0.0 ){ 482 while( realvalue>=1e32 && exp<=350 ){ realvalue *= 1e-32; exp+=32; } 483 while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; } 484 while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; } 485 while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; } 486 while( realvalue<1.0 ){ realvalue *= 10.0; exp--; } 487 if( exp>350 ){ 488 if( prefix=='-' ){ 489 bufpt = "-Inf"; 490 }else if( prefix=='+' ){ 491 bufpt = "+Inf"; 492 }else{ 493 bufpt = "Inf"; 494 } 495 length = strlen(bufpt); 496 break; 497 } 498 } 499 bufpt = buf; 500 /* 501 ** If the field type is etGENERIC, then convert to either etEXP 502 ** or etFLOAT, as appropriate. 503 */ 504 flag_exp = xtype==etEXP; 505 if( xtype!=etFLOAT ){ 506 realvalue += rounder; 507 if( realvalue>=10.0 ){ realvalue *= 0.1; exp++; } 508 } 509 if( xtype==etGENERIC ){ 510 flag_rtz = !flag_alternateform; 511 if( exp<-4 || exp>precision ){ 512 xtype = etEXP; 513 }else{ 514 precision = precision - exp; 515 xtype = etFLOAT; 516 } 517 }else{ 518 flag_rtz = 0; 519 } 520 if( xtype==etEXP ){ 521 e2 = 0; 522 }else{ 523 e2 = exp; 524 } 525 nsd = 0; 526 flag_dp = (precision>0) | flag_alternateform | flag_altform2; 527 /* The sign in front of the number */ 528 if( prefix ){ 529 *(bufpt++) = prefix; 530 } 531 /* Digits prior to the decimal point */ 532 if( e2<0 ){ 533 *(bufpt++) = '0'; 534 }else{ 535 for(; e2>=0; e2--){ 536 *(bufpt++) = et_getdigit(&realvalue,&nsd); 537 } 538 } 539 /* The decimal point */ 540 if( flag_dp ){ 541 *(bufpt++) = '.'; 542 } 543 /* "0" digits after the decimal point but before the first 544 ** significant digit of the number */ 545 for(e2++; e2<0; precision--, e2++){ 546 assert( precision>0 ); 547 *(bufpt++) = '0'; 548 } 549 /* Significant digits after the decimal point */ 550 while( (precision--)>0 ){ 551 *(bufpt++) = et_getdigit(&realvalue,&nsd); 552 } 553 /* Remove trailing zeros and the "." if no digits follow the "." */ 554 if( flag_rtz && flag_dp ){ 555 while( bufpt[-1]=='0' ) *(--bufpt) = 0; 556 assert( bufpt>buf ); 557 if( bufpt[-1]=='.' ){ 558 if( flag_altform2 ){ 559 *(bufpt++) = '0'; 560 }else{ 561 *(--bufpt) = 0; 562 } 563 } 564 } 565 /* Add the "eNNN" suffix */ 566 if( flag_exp || xtype==etEXP ){ 567 *(bufpt++) = aDigits[infop->charset]; 568 if( exp<0 ){ 569 *(bufpt++) = '-'; exp = -exp; 570 }else{ 571 *(bufpt++) = '+'; 572 } 573 if( exp>=100 ){ 574 *(bufpt++) = (exp/100)+'0'; /* 100's digit */ 575 exp %= 100; 576 } 577 *(bufpt++) = exp/10+'0'; /* 10's digit */ 578 *(bufpt++) = exp%10+'0'; /* 1's digit */ 579 } 580 *bufpt = 0; 581 582 /* The converted number is in buf[] and zero terminated. Output it. 583 ** Note that the number is in the usual order, not reversed as with 584 ** integer conversions. */ 585 length = bufpt-buf; 586 bufpt = buf; 587 588 /* Special case: Add leading zeros if the flag_zeropad flag is 589 ** set and we are not left justified */ 590 if( flag_zeropad && !flag_leftjustify && length < width){ 591 int i; 592 int nPad = width - length; 593 for(i=width; i>=nPad; i--){ 594 bufpt[i] = bufpt[i-nPad]; 595 } 596 i = prefix!=0; 597 while( nPad-- ) bufpt[i++] = '0'; 598 length = width; 599 } 600 #endif 601 break; 602 case etSIZE: 603 *(va_arg(ap,int*)) = pAccum->nChar; 604 length = width = 0; 605 break; 606 case etPERCENT: 607 buf[0] = '%'; 608 bufpt = buf; 609 length = 1; 610 break; 611 case etCHARX: 612 c = buf[0] = va_arg(ap,int); 613 if( precision>=0 ){ 614 for(idx=1; idx<precision; idx++) buf[idx] = c; 615 length = precision; 616 }else{ 617 length =1; 618 } 619 bufpt = buf; 620 break; 621 case etSTRING: 622 case etDYNSTRING: 623 bufpt = va_arg(ap,char*); 624 if( bufpt==0 ){ 625 bufpt = ""; 626 }else if( xtype==etDYNSTRING ){ 627 zExtra = bufpt; 628 } 629 if( precision>=0 ){ 630 for(length=0; length<precision && bufpt[length]; length++){} 631 }else{ 632 length = strlen(bufpt); 633 } 634 break; 635 case etSQLESCAPE: 636 case etSQLESCAPE2: 637 case etSQLESCAPE3: { 638 int i, j, n, ch, isnull; 639 int needQuote; 640 char q = ((xtype==etSQLESCAPE3)?'"':'\''); /* Quote character */ 641 char *escarg = va_arg(ap,char*); 642 isnull = escarg==0; 643 if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)"); 644 for(i=n=0; (ch=escarg[i])!=0; i++){ 645 if( ch==q ) n++; 646 } 647 needQuote = !isnull && xtype==etSQLESCAPE2; 648 n += i + 1 + needQuote*2; 649 if( n>etBUFSIZE ){ 650 bufpt = zExtra = sqlite3Malloc( n ); 651 if( bufpt==0 ) return; 652 }else{ 653 bufpt = buf; 654 } 655 j = 0; 656 if( needQuote ) bufpt[j++] = q; 657 for(i=0; (ch=escarg[i])!=0; i++){ 658 bufpt[j++] = ch; 659 if( ch==q ) bufpt[j++] = ch; 660 } 661 if( needQuote ) bufpt[j++] = q; 662 bufpt[j] = 0; 663 length = j; 664 /* The precision is ignored on %q and %Q */ 665 /* if( precision>=0 && precision<length ) length = precision; */ 666 break; 667 } 668 case etTOKEN: { 669 Token *pToken = va_arg(ap, Token*); 670 if( pToken ){ 671 sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n); 672 } 673 length = width = 0; 674 break; 675 } 676 case etSRCLIST: { 677 SrcList *pSrc = va_arg(ap, SrcList*); 678 int k = va_arg(ap, int); 679 struct SrcList_item *pItem = &pSrc->a[k]; 680 assert( k>=0 && k<pSrc->nSrc ); 681 if( pItem->zDatabase ){ 682 sqlite3StrAccumAppend(pAccum, pItem->zDatabase, -1); 683 sqlite3StrAccumAppend(pAccum, ".", 1); 684 } 685 sqlite3StrAccumAppend(pAccum, pItem->zName, -1); 686 length = width = 0; 687 break; 688 } 689 }/* End switch over the format type */ 690 /* 691 ** The text of the conversion is pointed to by "bufpt" and is 692 ** "length" characters long. The field width is "width". Do 693 ** the output. 694 */ 695 if( !flag_leftjustify ){ 696 register int nspace; 697 nspace = width-length; 698 if( nspace>0 ){ 699 appendSpace(pAccum, nspace); 700 } 701 } 702 if( length>0 ){ 703 sqlite3StrAccumAppend(pAccum, bufpt, length); 704 } 705 if( flag_leftjustify ){ 706 register int nspace; 707 nspace = width-length; 708 if( nspace>0 ){ 709 appendSpace(pAccum, nspace); 710 } 711 } 712 if( zExtra ){ 713 sqlite3_free(zExtra); 714 } 715 }/* End for loop over the format string */ 716 } /* End of function */ 717 718 /* 719 ** Append N bytes of text from z to the StrAccum object. 720 */ 721 void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){ 722 if( p->tooBig | p->mallocFailed ){ 723 return; 724 } 725 if( N<0 ){ 726 N = strlen(z); 727 } 728 if( N==0 ){ 729 return; 730 } 731 if( p->nChar+N >= p->nAlloc ){ 732 char *zNew; 733 if( !p->useMalloc ){ 734 p->tooBig = 1; 735 N = p->nAlloc - p->nChar - 1; 736 if( N<=0 ){ 737 return; 738 } 739 }else{ 740 i64 szNew = p->nChar; 741 szNew += N + 1; 742 if( szNew > p->mxAlloc ){ 743 sqlite3StrAccumReset(p); 744 p->tooBig = 1; 745 return; 746 }else{ 747 p->nAlloc = szNew; 748 } 749 zNew = sqlite3Malloc( p->nAlloc ); 750 if( zNew ){ 751 memcpy(zNew, p->zText, p->nChar); 752 sqlite3StrAccumReset(p); 753 p->zText = zNew; 754 }else{ 755 p->mallocFailed = 1; 756 sqlite3StrAccumReset(p); 757 return; 758 } 759 } 760 } 761 memcpy(&p->zText[p->nChar], z, N); 762 p->nChar += N; 763 } 764 765 /* 766 ** Finish off a string by making sure it is zero-terminated. 767 ** Return a pointer to the resulting string. Return a NULL 768 ** pointer if any kind of error was encountered. 769 */ 770 char *sqlite3StrAccumFinish(StrAccum *p){ 771 if( p->zText ){ 772 p->zText[p->nChar] = 0; 773 if( p->useMalloc && p->zText==p->zBase ){ 774 p->zText = sqlite3Malloc( p->nChar+1 ); 775 if( p->zText ){ 776 memcpy(p->zText, p->zBase, p->nChar+1); 777 }else{ 778 p->mallocFailed = 1; 779 } 780 } 781 } 782 return p->zText; 783 } 784 785 /* 786 ** Reset an StrAccum string. Reclaim all malloced memory. 787 */ 788 void sqlite3StrAccumReset(StrAccum *p){ 789 if( p->zText!=p->zBase ){ 790 sqlite3_free(p->zText); 791 } 792 p->zText = 0; 793 } 794 795 /* 796 ** Initialize a string accumulator 797 */ 798 void sqlite3StrAccumInit(StrAccum *p, char *zBase, int n, int mx){ 799 p->zText = p->zBase = zBase; 800 p->nChar = 0; 801 p->nAlloc = n; 802 p->mxAlloc = mx; 803 p->useMalloc = 1; 804 p->tooBig = 0; 805 p->mallocFailed = 0; 806 } 807 808 /* 809 ** Print into memory obtained from sqliteMalloc(). Use the internal 810 ** %-conversion extensions. 811 */ 812 char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){ 813 char *z; 814 char zBase[SQLITE_PRINT_BUF_SIZE]; 815 StrAccum acc; 816 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), 817 db ? db->aLimit[SQLITE_LIMIT_LENGTH] : SQLITE_MAX_LENGTH); 818 sqlite3VXPrintf(&acc, 1, zFormat, ap); 819 z = sqlite3StrAccumFinish(&acc); 820 if( acc.mallocFailed && db ){ 821 db->mallocFailed = 1; 822 } 823 return z; 824 } 825 826 /* 827 ** Print into memory obtained from sqliteMalloc(). Use the internal 828 ** %-conversion extensions. 829 */ 830 char *sqlite3MPrintf(sqlite3 *db, const char *zFormat, ...){ 831 va_list ap; 832 char *z; 833 va_start(ap, zFormat); 834 z = sqlite3VMPrintf(db, zFormat, ap); 835 va_end(ap); 836 return z; 837 } 838 839 /* 840 ** Print into memory obtained from sqlite3_malloc(). Omit the internal 841 ** %-conversion extensions. 842 */ 843 char *sqlite3_vmprintf(const char *zFormat, va_list ap){ 844 char *z; 845 char zBase[SQLITE_PRINT_BUF_SIZE]; 846 StrAccum acc; 847 #ifndef SQLITE_OMIT_AUTOINIT 848 if( sqlite3_initialize() ) return 0; 849 #endif 850 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), SQLITE_MAX_LENGTH); 851 sqlite3VXPrintf(&acc, 0, zFormat, ap); 852 z = sqlite3StrAccumFinish(&acc); 853 return z; 854 } 855 856 /* 857 ** Print into memory obtained from sqlite3_malloc()(). Omit the internal 858 ** %-conversion extensions. 859 */ 860 char *sqlite3_mprintf(const char *zFormat, ...){ 861 va_list ap; 862 char *z; 863 #ifndef SQLITE_OMIT_AUTOINIT 864 if( sqlite3_initialize() ) return 0; 865 #endif 866 va_start(ap, zFormat); 867 z = sqlite3_vmprintf(zFormat, ap); 868 va_end(ap); 869 return z; 870 } 871 872 /* 873 ** sqlite3_snprintf() works like snprintf() except that it ignores the 874 ** current locale settings. This is important for SQLite because we 875 ** are not able to use a "," as the decimal point in place of "." as 876 ** specified by some locales. 877 */ 878 char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){ 879 char *z; 880 va_list ap; 881 StrAccum acc; 882 883 if( n<=0 ){ 884 return zBuf; 885 } 886 sqlite3StrAccumInit(&acc, zBuf, n, 0); 887 acc.useMalloc = 0; 888 va_start(ap,zFormat); 889 sqlite3VXPrintf(&acc, 0, zFormat, ap); 890 va_end(ap); 891 z = sqlite3StrAccumFinish(&acc); 892 return z; 893 } 894 895 #if defined(SQLITE_DEBUG) 896 /* 897 ** A version of printf() that understands %lld. Used for debugging. 898 ** The printf() built into some versions of windows does not understand %lld 899 ** and segfaults if you give it a long long int. 900 */ 901 void sqlite3DebugPrintf(const char *zFormat, ...){ 902 va_list ap; 903 StrAccum acc; 904 char zBuf[500]; 905 sqlite3StrAccumInit(&acc, zBuf, sizeof(zBuf), 0); 906 acc.useMalloc = 0; 907 va_start(ap,zFormat); 908 sqlite3VXPrintf(&acc, 0, zFormat, ap); 909 va_end(ap); 910 sqlite3StrAccumFinish(&acc); 911 fprintf(stdout,"%s", zBuf); 912 fflush(stdout); 913 } 914 #endif 915