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 They are very out-of-date but might be useful as 5 ** an historical reference.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 ************************************************************************** 9 ** 10 ** The following modules is an enhanced replacement for the "printf" subroutines 11 ** found in the standard C library. The following enhancements are 12 ** supported: 13 ** 14 ** + Additional functions. The standard set of "printf" functions 15 ** includes printf, fprintf, sprintf, vprintf, vfprintf, and 16 ** vsprintf. This module adds the following: 17 ** 18 ** * snprintf -- Works like sprintf, but has an extra argument 19 ** which is the size of the buffer written to. 20 ** 21 ** * mprintf -- Similar to sprintf. Writes output to memory 22 ** obtained from malloc. 23 ** 24 ** * xprintf -- Calls a function to dispose of output. 25 ** 26 ** * nprintf -- No output, but returns the number of characters 27 ** that would have been output by printf. 28 ** 29 ** * A v- version (ex: vsnprintf) of every function is also 30 ** supplied. 31 ** 32 ** + A few extensions to the formatting notation are supported: 33 ** 34 ** * The "=" flag (similar to "-") causes the output to be 35 ** be centered in the appropriately sized field. 36 ** 37 ** * The %b field outputs an integer in binary notation. 38 ** 39 ** * The %c field now accepts a precision. The character output 40 ** is repeated by the number of times the precision specifies. 41 ** 42 ** * The %' field works like %c, but takes as its character the 43 ** next character of the format string, instead of the next 44 ** argument. For example, printf("%.78'-") prints 78 minus 45 ** signs, the same as printf("%.78c",'-'). 46 ** 47 ** + When compiled using GCC on a SPARC, this version of printf is 48 ** faster than the library printf for SUN OS 4.1. 49 ** 50 ** + All functions are fully reentrant. 51 ** 52 */ 53 #include "sqliteInt.h" 54 55 /* 56 ** Conversion types fall into various categories as defined by the 57 ** following enumeration. 58 */ 59 #define etRADIX 1 /* Integer types. %d, %x, %o, and so forth */ 60 #define etFLOAT 2 /* Floating point. %f */ 61 #define etEXP 3 /* Exponentional notation. %e and %E */ 62 #define etGENERIC 4 /* Floating or exponential, depending on exponent. %g */ 63 #define etSIZE 5 /* Return number of characters processed so far. %n */ 64 #define etSTRING 6 /* Strings. %s */ 65 #define etDYNSTRING 7 /* Dynamically allocated strings. %z */ 66 #define etPERCENT 8 /* Percent symbol. %% */ 67 #define etCHARX 9 /* Characters. %c */ 68 /* The rest are extensions, not normally found in printf() */ 69 #define etSQLESCAPE 10 /* Strings with '\'' doubled. %q */ 70 #define etSQLESCAPE2 11 /* Strings with '\'' doubled and enclosed in '', 71 NULL pointers replaced by SQL NULL. %Q */ 72 #define etTOKEN 12 /* a pointer to a Token structure */ 73 #define etSRCLIST 13 /* a pointer to a SrcList */ 74 #define etPOINTER 14 /* The %p conversion */ 75 #define etSQLESCAPE3 15 /* %w -> Strings with '\"' doubled */ 76 #define etORDINAL 16 /* %r -> 1st, 2nd, 3rd, 4th, etc. English only */ 77 78 #define etINVALID 0 /* Any unrecognized conversion type */ 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 }, 136 137 /* All the rest have the FLAG_INTERN bit set and are thus for internal 138 ** use only */ 139 { 'T', 0, 2, etTOKEN, 0, 0 }, 140 { 'S', 0, 2, etSRCLIST, 0, 0 }, 141 { 'r', 10, 3, etORDINAL, 0, 0 }, 142 }; 143 144 /* 145 ** If SQLITE_OMIT_FLOATING_POINT is defined, then none of the floating point 146 ** conversions will work. 147 */ 148 #ifndef SQLITE_OMIT_FLOATING_POINT 149 /* 150 ** "*val" is a double such that 0.1 <= *val < 10.0 151 ** Return the ascii code for the leading digit of *val, then 152 ** multiply "*val" by 10.0 to renormalize. 153 ** 154 ** Example: 155 ** input: *val = 3.14159 156 ** output: *val = 1.4159 function return = '3' 157 ** 158 ** The counter *cnt is incremented each time. After counter exceeds 159 ** 16 (the number of significant digits in a 64-bit float) '0' is 160 ** always returned. 161 */ 162 static char et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){ 163 int digit; 164 LONGDOUBLE_TYPE d; 165 if( (*cnt)++ >= 16 ) return '0'; 166 digit = (int)*val; 167 d = digit; 168 digit += '0'; 169 *val = (*val - d)*10.0; 170 return (char)digit; 171 } 172 #endif /* SQLITE_OMIT_FLOATING_POINT */ 173 174 /* 175 ** Append N space characters to the given string buffer. 176 */ 177 static void appendSpace(StrAccum *pAccum, int N){ 178 static const char zSpaces[] = " "; 179 while( N>=(int)sizeof(zSpaces)-1 ){ 180 sqlite3StrAccumAppend(pAccum, zSpaces, sizeof(zSpaces)-1); 181 N -= sizeof(zSpaces)-1; 182 } 183 if( N>0 ){ 184 sqlite3StrAccumAppend(pAccum, zSpaces, N); 185 } 186 } 187 188 /* 189 ** On machines with a small stack size, you can redefine the 190 ** SQLITE_PRINT_BUF_SIZE to be less than 350. 191 */ 192 #ifndef SQLITE_PRINT_BUF_SIZE 193 # if defined(SQLITE_SMALL_STACK) 194 # define SQLITE_PRINT_BUF_SIZE 50 195 # else 196 # define SQLITE_PRINT_BUF_SIZE 350 197 # endif 198 #endif 199 #define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */ 200 201 /* 202 ** The root program. All variations call this core. 203 ** 204 ** INPUTS: 205 ** func This is a pointer to a function taking three arguments 206 ** 1. A pointer to anything. Same as the "arg" parameter. 207 ** 2. A pointer to the list of characters to be output 208 ** (Note, this list is NOT null terminated.) 209 ** 3. An integer number of characters to be output. 210 ** (Note: This number might be zero.) 211 ** 212 ** arg This is the pointer to anything which will be passed as the 213 ** first argument to "func". Use it for whatever you like. 214 ** 215 ** fmt This is the format string, as in the usual print. 216 ** 217 ** ap This is a pointer to a list of arguments. Same as in 218 ** vfprint. 219 ** 220 ** OUTPUTS: 221 ** The return value is the total number of characters sent to 222 ** the function "func". Returns -1 on a error. 223 ** 224 ** Note that the order in which automatic variables are declared below 225 ** seems to make a big difference in determining how fast this beast 226 ** will run. 227 */ 228 void sqlite3VXPrintf( 229 StrAccum *pAccum, /* Accumulate results here */ 230 int useExtended, /* Allow extended %-conversions */ 231 const char *fmt, /* Format string */ 232 va_list ap /* arguments */ 233 ){ 234 int c; /* Next character in the format string */ 235 char *bufpt; /* Pointer to the conversion buffer */ 236 int precision; /* Precision of the current field */ 237 int length; /* Length of the field */ 238 int idx; /* A general purpose loop counter */ 239 int width; /* Width of the current field */ 240 etByte flag_leftjustify; /* True if "-" flag is present */ 241 etByte flag_plussign; /* True if "+" flag is present */ 242 etByte flag_blanksign; /* True if " " flag is present */ 243 etByte flag_alternateform; /* True if "#" flag is present */ 244 etByte flag_altform2; /* True if "!" flag is present */ 245 etByte flag_zeropad; /* True if field width constant starts with zero */ 246 etByte flag_long; /* True if "l" flag is present */ 247 etByte flag_longlong; /* True if the "ll" flag is present */ 248 etByte done; /* Loop termination flag */ 249 sqlite_uint64 longvalue; /* Value for integer types */ 250 LONGDOUBLE_TYPE realvalue; /* Value for real types */ 251 const et_info *infop; /* Pointer to the appropriate info structure */ 252 char buf[etBUFSIZE]; /* Conversion buffer */ 253 char prefix; /* Prefix character. "+" or "-" or " " or '\0'. */ 254 etByte xtype = 0; /* Conversion paradigm */ 255 char *zExtra; /* Extra memory used for etTCLESCAPE conversions */ 256 #ifndef SQLITE_OMIT_FLOATING_POINT 257 int exp, e2; /* exponent of real numbers */ 258 double rounder; /* Used for rounding floating point values */ 259 etByte flag_dp; /* True if decimal point should be shown */ 260 etByte flag_rtz; /* True if trailing zeros should be removed */ 261 etByte flag_exp; /* True to force display of the exponent */ 262 int nsd; /* Number of significant digits returned */ 263 #endif 264 265 length = 0; 266 bufpt = 0; 267 for(; (c=(*fmt))!=0; ++fmt){ 268 if( c!='%' ){ 269 int amt; 270 bufpt = (char *)fmt; 271 amt = 1; 272 while( (c=(*++fmt))!='%' && c!=0 ) amt++; 273 sqlite3StrAccumAppend(pAccum, bufpt, amt); 274 if( c==0 ) break; 275 } 276 if( (c=(*++fmt))==0 ){ 277 sqlite3StrAccumAppend(pAccum, "%", 1); 278 break; 279 } 280 /* Find out what flags are present */ 281 flag_leftjustify = flag_plussign = flag_blanksign = 282 flag_alternateform = flag_altform2 = flag_zeropad = 0; 283 done = 0; 284 do{ 285 switch( c ){ 286 case '-': flag_leftjustify = 1; break; 287 case '+': flag_plussign = 1; break; 288 case ' ': flag_blanksign = 1; break; 289 case '#': flag_alternateform = 1; break; 290 case '!': flag_altform2 = 1; break; 291 case '0': flag_zeropad = 1; break; 292 default: done = 1; break; 293 } 294 }while( !done && (c=(*++fmt))!=0 ); 295 /* Get the field width */ 296 width = 0; 297 if( c=='*' ){ 298 width = va_arg(ap,int); 299 if( width<0 ){ 300 flag_leftjustify = 1; 301 width = -width; 302 } 303 c = *++fmt; 304 }else{ 305 while( c>='0' && c<='9' ){ 306 width = width*10 + c - '0'; 307 c = *++fmt; 308 } 309 } 310 if( width > etBUFSIZE-10 ){ 311 width = etBUFSIZE-10; 312 } 313 /* Get the precision */ 314 if( c=='.' ){ 315 precision = 0; 316 c = *++fmt; 317 if( c=='*' ){ 318 precision = va_arg(ap,int); 319 if( precision<0 ) precision = -precision; 320 c = *++fmt; 321 }else{ 322 while( c>='0' && c<='9' ){ 323 precision = precision*10 + c - '0'; 324 c = *++fmt; 325 } 326 } 327 }else{ 328 precision = -1; 329 } 330 /* Get the conversion type modifier */ 331 if( c=='l' ){ 332 flag_long = 1; 333 c = *++fmt; 334 if( c=='l' ){ 335 flag_longlong = 1; 336 c = *++fmt; 337 }else{ 338 flag_longlong = 0; 339 } 340 }else{ 341 flag_long = flag_longlong = 0; 342 } 343 /* Fetch the info entry for the field */ 344 infop = &fmtinfo[0]; 345 xtype = etINVALID; 346 for(idx=0; idx<ArraySize(fmtinfo); idx++){ 347 if( c==fmtinfo[idx].fmttype ){ 348 infop = &fmtinfo[idx]; 349 if( useExtended || (infop->flags & FLAG_INTERN)==0 ){ 350 xtype = infop->type; 351 }else{ 352 return; 353 } 354 break; 355 } 356 } 357 zExtra = 0; 358 359 360 /* Limit the precision to prevent overflowing buf[] during conversion */ 361 if( precision>etBUFSIZE-40 && (infop->flags & FLAG_STRING)==0 ){ 362 precision = etBUFSIZE-40; 363 } 364 365 /* 366 ** At this point, variables are initialized as follows: 367 ** 368 ** flag_alternateform TRUE if a '#' is present. 369 ** flag_altform2 TRUE if a '!' is present. 370 ** flag_plussign TRUE if a '+' is present. 371 ** flag_leftjustify TRUE if a '-' is present or if the 372 ** field width was negative. 373 ** flag_zeropad TRUE if the width began with 0. 374 ** flag_long TRUE if the letter 'l' (ell) prefixed 375 ** the conversion character. 376 ** flag_longlong TRUE if the letter 'll' (ell ell) prefixed 377 ** the conversion character. 378 ** flag_blanksign TRUE if a ' ' is present. 379 ** width The specified field width. This is 380 ** always non-negative. Zero is the default. 381 ** precision The specified precision. The default 382 ** is -1. 383 ** xtype The class of the conversion. 384 ** infop Pointer to the appropriate info struct. 385 */ 386 switch( xtype ){ 387 case etPOINTER: 388 flag_longlong = sizeof(char*)==sizeof(i64); 389 flag_long = sizeof(char*)==sizeof(long int); 390 /* Fall through into the next case */ 391 case etORDINAL: 392 case etRADIX: 393 if( infop->flags & FLAG_SIGNED ){ 394 i64 v; 395 if( flag_longlong ){ 396 v = va_arg(ap,i64); 397 }else if( flag_long ){ 398 v = va_arg(ap,long int); 399 }else{ 400 v = va_arg(ap,int); 401 } 402 if( v<0 ){ 403 longvalue = -v; 404 prefix = '-'; 405 }else{ 406 longvalue = v; 407 if( flag_plussign ) prefix = '+'; 408 else if( flag_blanksign ) prefix = ' '; 409 else prefix = 0; 410 } 411 }else{ 412 if( flag_longlong ){ 413 longvalue = va_arg(ap,u64); 414 }else if( flag_long ){ 415 longvalue = va_arg(ap,unsigned long int); 416 }else{ 417 longvalue = va_arg(ap,unsigned int); 418 } 419 prefix = 0; 420 } 421 if( longvalue==0 ) flag_alternateform = 0; 422 if( flag_zeropad && precision<width-(prefix!=0) ){ 423 precision = width-(prefix!=0); 424 } 425 bufpt = &buf[etBUFSIZE-1]; 426 if( xtype==etORDINAL ){ 427 static const char zOrd[] = "thstndrd"; 428 int x = (int)(longvalue % 10); 429 if( x>=4 || (longvalue/10)%10==1 ){ 430 x = 0; 431 } 432 buf[etBUFSIZE-3] = zOrd[x*2]; 433 buf[etBUFSIZE-2] = zOrd[x*2+1]; 434 bufpt -= 2; 435 } 436 { 437 register const char *cset; /* Use registers for speed */ 438 register int base; 439 cset = &aDigits[infop->charset]; 440 base = infop->base; 441 do{ /* Convert to ascii */ 442 *(--bufpt) = cset[longvalue%base]; 443 longvalue = longvalue/base; 444 }while( longvalue>0 ); 445 } 446 length = (int)(&buf[etBUFSIZE-1]-bufpt); 447 for(idx=precision-length; idx>0; idx--){ 448 *(--bufpt) = '0'; /* Zero pad */ 449 } 450 if( prefix ) *(--bufpt) = prefix; /* Add sign */ 451 if( flag_alternateform && infop->prefix ){ /* Add "0" or "0x" */ 452 const char *pre; 453 char x; 454 pre = &aPrefix[infop->prefix]; 455 for(; (x=(*pre))!=0; pre++) *(--bufpt) = x; 456 } 457 length = (int)(&buf[etBUFSIZE-1]-bufpt); 458 break; 459 case etFLOAT: 460 case etEXP: 461 case etGENERIC: 462 realvalue = va_arg(ap,double); 463 #ifndef SQLITE_OMIT_FLOATING_POINT 464 if( precision<0 ) precision = 6; /* Set default precision */ 465 if( precision>etBUFSIZE/2-10 ) precision = etBUFSIZE/2-10; 466 if( realvalue<0.0 ){ 467 realvalue = -realvalue; 468 prefix = '-'; 469 }else{ 470 if( flag_plussign ) prefix = '+'; 471 else if( flag_blanksign ) prefix = ' '; 472 else prefix = 0; 473 } 474 if( xtype==etGENERIC && precision>0 ) precision--; 475 #if 0 476 /* Rounding works like BSD when the constant 0.4999 is used. Wierd! */ 477 for(idx=precision, rounder=0.4999; idx>0; idx--, rounder*=0.1); 478 #else 479 /* It makes more sense to use 0.5 */ 480 for(idx=precision, rounder=0.5; idx>0; idx--, rounder*=0.1){} 481 #endif 482 if( xtype==etFLOAT ) realvalue += rounder; 483 /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */ 484 exp = 0; 485 if( sqlite3IsNaN((double)realvalue) ){ 486 bufpt = "NaN"; 487 length = 3; 488 break; 489 } 490 if( realvalue>0.0 ){ 491 while( realvalue>=1e32 && exp<=350 ){ realvalue *= 1e-32; exp+=32; } 492 while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; } 493 while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; } 494 while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; } 495 while( realvalue<1.0 ){ realvalue *= 10.0; exp--; } 496 if( exp>350 ){ 497 if( prefix=='-' ){ 498 bufpt = "-Inf"; 499 }else if( prefix=='+' ){ 500 bufpt = "+Inf"; 501 }else{ 502 bufpt = "Inf"; 503 } 504 length = sqlite3Strlen30(bufpt); 505 break; 506 } 507 } 508 bufpt = buf; 509 /* 510 ** If the field type is etGENERIC, then convert to either etEXP 511 ** or etFLOAT, as appropriate. 512 */ 513 flag_exp = xtype==etEXP; 514 if( xtype!=etFLOAT ){ 515 realvalue += rounder; 516 if( realvalue>=10.0 ){ realvalue *= 0.1; exp++; } 517 } 518 if( xtype==etGENERIC ){ 519 flag_rtz = !flag_alternateform; 520 if( exp<-4 || exp>precision ){ 521 xtype = etEXP; 522 }else{ 523 precision = precision - exp; 524 xtype = etFLOAT; 525 } 526 }else{ 527 flag_rtz = 0; 528 } 529 if( xtype==etEXP ){ 530 e2 = 0; 531 }else{ 532 e2 = exp; 533 } 534 nsd = 0; 535 flag_dp = (precision>0 ?1:0) | flag_alternateform | flag_altform2; 536 /* The sign in front of the number */ 537 if( prefix ){ 538 *(bufpt++) = prefix; 539 } 540 /* Digits prior to the decimal point */ 541 if( e2<0 ){ 542 *(bufpt++) = '0'; 543 }else{ 544 for(; e2>=0; e2--){ 545 *(bufpt++) = et_getdigit(&realvalue,&nsd); 546 } 547 } 548 /* The decimal point */ 549 if( flag_dp ){ 550 *(bufpt++) = '.'; 551 } 552 /* "0" digits after the decimal point but before the first 553 ** significant digit of the number */ 554 for(e2++; e2<0; precision--, e2++){ 555 assert( precision>0 ); 556 *(bufpt++) = '0'; 557 } 558 /* Significant digits after the decimal point */ 559 while( (precision--)>0 ){ 560 *(bufpt++) = et_getdigit(&realvalue,&nsd); 561 } 562 /* Remove trailing zeros and the "." if no digits follow the "." */ 563 if( flag_rtz && flag_dp ){ 564 while( bufpt[-1]=='0' ) *(--bufpt) = 0; 565 assert( bufpt>buf ); 566 if( bufpt[-1]=='.' ){ 567 if( flag_altform2 ){ 568 *(bufpt++) = '0'; 569 }else{ 570 *(--bufpt) = 0; 571 } 572 } 573 } 574 /* Add the "eNNN" suffix */ 575 if( flag_exp || xtype==etEXP ){ 576 *(bufpt++) = aDigits[infop->charset]; 577 if( exp<0 ){ 578 *(bufpt++) = '-'; exp = -exp; 579 }else{ 580 *(bufpt++) = '+'; 581 } 582 if( exp>=100 ){ 583 *(bufpt++) = (char)((exp/100)+'0'); /* 100's digit */ 584 exp %= 100; 585 } 586 *(bufpt++) = (char)(exp/10+'0'); /* 10's digit */ 587 *(bufpt++) = (char)(exp%10+'0'); /* 1's digit */ 588 } 589 *bufpt = 0; 590 591 /* The converted number is in buf[] and zero terminated. Output it. 592 ** Note that the number is in the usual order, not reversed as with 593 ** integer conversions. */ 594 length = (int)(bufpt-buf); 595 bufpt = buf; 596 597 /* Special case: Add leading zeros if the flag_zeropad flag is 598 ** set and we are not left justified */ 599 if( flag_zeropad && !flag_leftjustify && length < width){ 600 int i; 601 int nPad = width - length; 602 for(i=width; i>=nPad; i--){ 603 bufpt[i] = bufpt[i-nPad]; 604 } 605 i = prefix!=0; 606 while( nPad-- ) bufpt[i++] = '0'; 607 length = width; 608 } 609 #endif 610 break; 611 case etSIZE: 612 *(va_arg(ap,int*)) = pAccum->nChar; 613 length = width = 0; 614 break; 615 case etPERCENT: 616 buf[0] = '%'; 617 bufpt = buf; 618 length = 1; 619 break; 620 case etCHARX: 621 c = va_arg(ap,int); 622 buf[0] = (char)c; 623 if( precision>=0 ){ 624 for(idx=1; idx<precision; idx++) buf[idx] = (char)c; 625 length = precision; 626 }else{ 627 length =1; 628 } 629 bufpt = buf; 630 break; 631 case etSTRING: 632 case etDYNSTRING: 633 bufpt = va_arg(ap,char*); 634 if( bufpt==0 ){ 635 bufpt = ""; 636 }else if( xtype==etDYNSTRING ){ 637 zExtra = bufpt; 638 } 639 if( precision>=0 ){ 640 for(length=0; length<precision && bufpt[length]; length++){} 641 }else{ 642 length = sqlite3Strlen30(bufpt); 643 } 644 break; 645 case etSQLESCAPE: 646 case etSQLESCAPE2: 647 case etSQLESCAPE3: { 648 int i, j, k, n, isnull; 649 int needQuote; 650 char ch; 651 char q = ((xtype==etSQLESCAPE3)?'"':'\''); /* Quote character */ 652 char *escarg = va_arg(ap,char*); 653 isnull = escarg==0; 654 if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)"); 655 k = precision; 656 for(i=n=0; (ch=escarg[i])!=0 && k!=0; i++, k--){ 657 if( ch==q ) n++; 658 } 659 needQuote = !isnull && xtype==etSQLESCAPE2; 660 n += i + 1 + needQuote*2; 661 if( n>etBUFSIZE ){ 662 bufpt = zExtra = sqlite3Malloc( n ); 663 if( bufpt==0 ){ 664 pAccum->mallocFailed = 1; 665 return; 666 } 667 }else{ 668 bufpt = buf; 669 } 670 j = 0; 671 if( needQuote ) bufpt[j++] = q; 672 k = i; 673 for(i=0; i<k; i++){ 674 bufpt[j++] = ch = escarg[i]; 675 if( ch==q ) bufpt[j++] = ch; 676 } 677 if( needQuote ) bufpt[j++] = q; 678 bufpt[j] = 0; 679 length = j; 680 /* The precision in %q and %Q means how many input characters to 681 ** consume, not the length of the output... 682 ** if( precision>=0 && precision<length ) length = precision; */ 683 break; 684 } 685 case etTOKEN: { 686 Token *pToken = va_arg(ap, Token*); 687 if( pToken ){ 688 sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n); 689 } 690 length = width = 0; 691 break; 692 } 693 case etSRCLIST: { 694 SrcList *pSrc = va_arg(ap, SrcList*); 695 int k = va_arg(ap, int); 696 struct SrcList_item *pItem = &pSrc->a[k]; 697 assert( k>=0 && k<pSrc->nSrc ); 698 if( pItem->zDatabase ){ 699 sqlite3StrAccumAppend(pAccum, pItem->zDatabase, -1); 700 sqlite3StrAccumAppend(pAccum, ".", 1); 701 } 702 sqlite3StrAccumAppend(pAccum, pItem->zName, -1); 703 length = width = 0; 704 break; 705 } 706 default: { 707 assert( xtype==etINVALID ); 708 return; 709 } 710 }/* End switch over the format type */ 711 /* 712 ** The text of the conversion is pointed to by "bufpt" and is 713 ** "length" characters long. The field width is "width". Do 714 ** the output. 715 */ 716 if( !flag_leftjustify ){ 717 register int nspace; 718 nspace = width-length; 719 if( nspace>0 ){ 720 appendSpace(pAccum, nspace); 721 } 722 } 723 if( length>0 ){ 724 sqlite3StrAccumAppend(pAccum, bufpt, length); 725 } 726 if( flag_leftjustify ){ 727 register int nspace; 728 nspace = width-length; 729 if( nspace>0 ){ 730 appendSpace(pAccum, nspace); 731 } 732 } 733 if( zExtra ){ 734 sqlite3_free(zExtra); 735 } 736 }/* End for loop over the format string */ 737 } /* End of function */ 738 739 /* 740 ** Append N bytes of text from z to the StrAccum object. 741 */ 742 void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){ 743 assert( z!=0 || N==0 ); 744 if( p->tooBig | p->mallocFailed ){ 745 testcase(p->tooBig); 746 testcase(p->mallocFailed); 747 return; 748 } 749 if( N<0 ){ 750 N = sqlite3Strlen30(z); 751 } 752 if( N==0 || NEVER(z==0) ){ 753 return; 754 } 755 if( p->nChar+N >= p->nAlloc ){ 756 char *zNew; 757 if( !p->useMalloc ){ 758 p->tooBig = 1; 759 N = p->nAlloc - p->nChar - 1; 760 if( N<=0 ){ 761 return; 762 } 763 }else{ 764 i64 szNew = p->nChar; 765 szNew += N + 1; 766 if( szNew > p->mxAlloc ){ 767 sqlite3StrAccumReset(p); 768 p->tooBig = 1; 769 return; 770 }else{ 771 p->nAlloc = (int)szNew; 772 } 773 zNew = sqlite3DbMallocRaw(p->db, p->nAlloc ); 774 if( zNew ){ 775 memcpy(zNew, p->zText, p->nChar); 776 sqlite3StrAccumReset(p); 777 p->zText = zNew; 778 }else{ 779 p->mallocFailed = 1; 780 sqlite3StrAccumReset(p); 781 return; 782 } 783 } 784 } 785 memcpy(&p->zText[p->nChar], z, N); 786 p->nChar += N; 787 } 788 789 /* 790 ** Finish off a string by making sure it is zero-terminated. 791 ** Return a pointer to the resulting string. Return a NULL 792 ** pointer if any kind of error was encountered. 793 */ 794 char *sqlite3StrAccumFinish(StrAccum *p){ 795 if( p->zText ){ 796 p->zText[p->nChar] = 0; 797 if( p->useMalloc && p->zText==p->zBase ){ 798 p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 ); 799 if( p->zText ){ 800 memcpy(p->zText, p->zBase, p->nChar+1); 801 }else{ 802 p->mallocFailed = 1; 803 } 804 } 805 } 806 return p->zText; 807 } 808 809 /* 810 ** Reset an StrAccum string. Reclaim all malloced memory. 811 */ 812 void sqlite3StrAccumReset(StrAccum *p){ 813 if( p->zText!=p->zBase ){ 814 sqlite3DbFree(p->db, p->zText); 815 } 816 p->zText = 0; 817 } 818 819 /* 820 ** Initialize a string accumulator 821 */ 822 void sqlite3StrAccumInit(StrAccum *p, char *zBase, int n, int mx){ 823 p->zText = p->zBase = zBase; 824 p->db = 0; 825 p->nChar = 0; 826 p->nAlloc = n; 827 p->mxAlloc = mx; 828 p->useMalloc = 1; 829 p->tooBig = 0; 830 p->mallocFailed = 0; 831 } 832 833 /* 834 ** Print into memory obtained from sqliteMalloc(). Use the internal 835 ** %-conversion extensions. 836 */ 837 char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){ 838 char *z; 839 char zBase[SQLITE_PRINT_BUF_SIZE]; 840 StrAccum acc; 841 assert( db!=0 ); 842 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), 843 db->aLimit[SQLITE_LIMIT_LENGTH]); 844 acc.db = db; 845 sqlite3VXPrintf(&acc, 1, zFormat, ap); 846 z = sqlite3StrAccumFinish(&acc); 847 if( acc.mallocFailed ){ 848 db->mallocFailed = 1; 849 } 850 return z; 851 } 852 853 /* 854 ** Print into memory obtained from sqliteMalloc(). Use the internal 855 ** %-conversion extensions. 856 */ 857 char *sqlite3MPrintf(sqlite3 *db, const char *zFormat, ...){ 858 va_list ap; 859 char *z; 860 va_start(ap, zFormat); 861 z = sqlite3VMPrintf(db, zFormat, ap); 862 va_end(ap); 863 return z; 864 } 865 866 /* 867 ** Like sqlite3MPrintf(), but call sqlite3DbFree() on zStr after formatting 868 ** the string and before returnning. This routine is intended to be used 869 ** to modify an existing string. For example: 870 ** 871 ** x = sqlite3MPrintf(db, x, "prefix %s suffix", x); 872 ** 873 */ 874 char *sqlite3MAppendf(sqlite3 *db, char *zStr, const char *zFormat, ...){ 875 va_list ap; 876 char *z; 877 va_start(ap, zFormat); 878 z = sqlite3VMPrintf(db, zFormat, ap); 879 va_end(ap); 880 sqlite3DbFree(db, zStr); 881 return z; 882 } 883 884 /* 885 ** Print into memory obtained from sqlite3_malloc(). Omit the internal 886 ** %-conversion extensions. 887 */ 888 char *sqlite3_vmprintf(const char *zFormat, va_list ap){ 889 char *z; 890 char zBase[SQLITE_PRINT_BUF_SIZE]; 891 StrAccum acc; 892 #ifndef SQLITE_OMIT_AUTOINIT 893 if( sqlite3_initialize() ) return 0; 894 #endif 895 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), SQLITE_MAX_LENGTH); 896 sqlite3VXPrintf(&acc, 0, zFormat, ap); 897 z = sqlite3StrAccumFinish(&acc); 898 return z; 899 } 900 901 /* 902 ** Print into memory obtained from sqlite3_malloc()(). Omit the internal 903 ** %-conversion extensions. 904 */ 905 char *sqlite3_mprintf(const char *zFormat, ...){ 906 va_list ap; 907 char *z; 908 #ifndef SQLITE_OMIT_AUTOINIT 909 if( sqlite3_initialize() ) return 0; 910 #endif 911 va_start(ap, zFormat); 912 z = sqlite3_vmprintf(zFormat, ap); 913 va_end(ap); 914 return z; 915 } 916 917 /* 918 ** sqlite3_snprintf() works like snprintf() except that it ignores the 919 ** current locale settings. This is important for SQLite because we 920 ** are not able to use a "," as the decimal point in place of "." as 921 ** specified by some locales. 922 */ 923 char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){ 924 char *z; 925 va_list ap; 926 StrAccum acc; 927 928 if( n<=0 ){ 929 return zBuf; 930 } 931 sqlite3StrAccumInit(&acc, zBuf, n, 0); 932 acc.useMalloc = 0; 933 va_start(ap,zFormat); 934 sqlite3VXPrintf(&acc, 0, zFormat, ap); 935 va_end(ap); 936 z = sqlite3StrAccumFinish(&acc); 937 return z; 938 } 939 940 #if defined(SQLITE_DEBUG) 941 /* 942 ** A version of printf() that understands %lld. Used for debugging. 943 ** The printf() built into some versions of windows does not understand %lld 944 ** and segfaults if you give it a long long int. 945 */ 946 void sqlite3DebugPrintf(const char *zFormat, ...){ 947 va_list ap; 948 StrAccum acc; 949 char zBuf[500]; 950 sqlite3StrAccumInit(&acc, zBuf, sizeof(zBuf), 0); 951 acc.useMalloc = 0; 952 va_start(ap,zFormat); 953 sqlite3VXPrintf(&acc, 0, zFormat, ap); 954 va_end(ap); 955 sqlite3StrAccumFinish(&acc); 956 fprintf(stdout,"%s", zBuf); 957 fflush(stdout); 958 } 959 #endif 960 961 #ifndef SQLITE_OMIT_TRACE 962 /* 963 ** variable-argument wrapper around sqlite3VXPrintf(). 964 */ 965 void sqlite3XPrintf(StrAccum *p, const char *zFormat, ...){ 966 va_list ap; 967 va_start(ap,zFormat); 968 sqlite3VXPrintf(p, 1, zFormat, ap); 969 va_end(ap); 970 } 971 #endif 972