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 They are very out-of-date but might be useful as 5 ** an historical reference.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 1.102 2009/04/08 16:10:04 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 #define etINVALID 0 /* Any unrecognized conversion type */ 81 82 83 /* 84 ** An "etByte" is an 8-bit unsigned value. 85 */ 86 typedef unsigned char etByte; 87 88 /* 89 ** Each builtin conversion character (ex: the 'd' in "%d") is described 90 ** by an instance of the following structure 91 */ 92 typedef struct et_info { /* Information about each format field */ 93 char fmttype; /* The format field code letter */ 94 etByte base; /* The base for radix conversion */ 95 etByte flags; /* One or more of FLAG_ constants below */ 96 etByte type; /* Conversion paradigm */ 97 etByte charset; /* Offset into aDigits[] of the digits string */ 98 etByte prefix; /* Offset into aPrefix[] of the prefix string */ 99 } et_info; 100 101 /* 102 ** Allowed values for et_info.flags 103 */ 104 #define FLAG_SIGNED 1 /* True if the value to convert is signed */ 105 #define FLAG_INTERN 2 /* True if for internal use only */ 106 #define FLAG_STRING 4 /* Allow infinity precision */ 107 108 109 /* 110 ** The following table is searched linearly, so it is good to put the 111 ** most frequently used conversion types first. 112 */ 113 static const char aDigits[] = "0123456789ABCDEF0123456789abcdef"; 114 static const char aPrefix[] = "-x0\000X0"; 115 static const et_info fmtinfo[] = { 116 { 'd', 10, 1, etRADIX, 0, 0 }, 117 { 's', 0, 4, etSTRING, 0, 0 }, 118 { 'g', 0, 1, etGENERIC, 30, 0 }, 119 { 'z', 0, 4, etDYNSTRING, 0, 0 }, 120 { 'q', 0, 4, etSQLESCAPE, 0, 0 }, 121 { 'Q', 0, 4, etSQLESCAPE2, 0, 0 }, 122 { 'w', 0, 4, etSQLESCAPE3, 0, 0 }, 123 { 'c', 0, 0, etCHARX, 0, 0 }, 124 { 'o', 8, 0, etRADIX, 0, 2 }, 125 { 'u', 10, 0, etRADIX, 0, 0 }, 126 { 'x', 16, 0, etRADIX, 16, 1 }, 127 { 'X', 16, 0, etRADIX, 0, 4 }, 128 #ifndef SQLITE_OMIT_FLOATING_POINT 129 { 'f', 0, 1, etFLOAT, 0, 0 }, 130 { 'e', 0, 1, etEXP, 30, 0 }, 131 { 'E', 0, 1, etEXP, 14, 0 }, 132 { 'G', 0, 1, etGENERIC, 14, 0 }, 133 #endif 134 { 'i', 10, 1, etRADIX, 0, 0 }, 135 { 'n', 0, 0, etSIZE, 0, 0 }, 136 { '%', 0, 0, etPERCENT, 0, 0 }, 137 { 'p', 16, 0, etPOINTER, 0, 1 }, 138 139 /* All the rest have the FLAG_INTERN bit set and are thus for internal 140 ** use only */ 141 { 'T', 0, 2, etTOKEN, 0, 0 }, 142 { 'S', 0, 2, etSRCLIST, 0, 0 }, 143 { 'r', 10, 3, etORDINAL, 0, 0 }, 144 }; 145 146 /* 147 ** If SQLITE_OMIT_FLOATING_POINT is defined, then none of the floating point 148 ** conversions will work. 149 */ 150 #ifndef SQLITE_OMIT_FLOATING_POINT 151 /* 152 ** "*val" is a double such that 0.1 <= *val < 10.0 153 ** Return the ascii code for the leading digit of *val, then 154 ** multiply "*val" by 10.0 to renormalize. 155 ** 156 ** Example: 157 ** input: *val = 3.14159 158 ** output: *val = 1.4159 function return = '3' 159 ** 160 ** The counter *cnt is incremented each time. After counter exceeds 161 ** 16 (the number of significant digits in a 64-bit float) '0' is 162 ** always returned. 163 */ 164 static char et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){ 165 int digit; 166 LONGDOUBLE_TYPE d; 167 if( (*cnt)++ >= 16 ) return '0'; 168 digit = (int)*val; 169 d = digit; 170 digit += '0'; 171 *val = (*val - d)*10.0; 172 return (char)digit; 173 } 174 #endif /* SQLITE_OMIT_FLOATING_POINT */ 175 176 /* 177 ** Append N space characters to the given string buffer. 178 */ 179 static void appendSpace(StrAccum *pAccum, int N){ 180 static const char zSpaces[] = " "; 181 while( N>=(int)sizeof(zSpaces)-1 ){ 182 sqlite3StrAccumAppend(pAccum, zSpaces, sizeof(zSpaces)-1); 183 N -= sizeof(zSpaces)-1; 184 } 185 if( N>0 ){ 186 sqlite3StrAccumAppend(pAccum, zSpaces, N); 187 } 188 } 189 190 /* 191 ** On machines with a small stack size, you can redefine the 192 ** SQLITE_PRINT_BUF_SIZE to be less than 350. But beware - for 193 ** smaller values some %f conversions may go into an infinite loop. 194 */ 195 #ifndef SQLITE_PRINT_BUF_SIZE 196 # define SQLITE_PRINT_BUF_SIZE 350 197 #endif 198 #define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */ 199 200 /* 201 ** The root program. All variations call this core. 202 ** 203 ** INPUTS: 204 ** func This is a pointer to a function taking three arguments 205 ** 1. A pointer to anything. Same as the "arg" parameter. 206 ** 2. A pointer to the list of characters to be output 207 ** (Note, this list is NOT null terminated.) 208 ** 3. An integer number of characters to be output. 209 ** (Note: This number might be zero.) 210 ** 211 ** arg This is the pointer to anything which will be passed as the 212 ** first argument to "func". Use it for whatever you like. 213 ** 214 ** fmt This is the format string, as in the usual print. 215 ** 216 ** ap This is a pointer to a list of arguments. Same as in 217 ** vfprint. 218 ** 219 ** OUTPUTS: 220 ** The return value is the total number of characters sent to 221 ** the function "func". Returns -1 on a error. 222 ** 223 ** Note that the order in which automatic variables are declared below 224 ** seems to make a big difference in determining how fast this beast 225 ** will run. 226 */ 227 void sqlite3VXPrintf( 228 StrAccum *pAccum, /* Accumulate results here */ 229 int useExtended, /* Allow extended %-conversions */ 230 const char *fmt, /* Format string */ 231 va_list ap /* arguments */ 232 ){ 233 int c; /* Next character in the format string */ 234 char *bufpt; /* Pointer to the conversion buffer */ 235 int precision; /* Precision of the current field */ 236 int length; /* Length of the field */ 237 int idx; /* A general purpose loop counter */ 238 int width; /* Width of the current field */ 239 etByte flag_leftjustify; /* True if "-" flag is present */ 240 etByte flag_plussign; /* True if "+" flag is present */ 241 etByte flag_blanksign; /* True if " " flag is present */ 242 etByte flag_alternateform; /* True if "#" flag is present */ 243 etByte flag_altform2; /* True if "!" flag is present */ 244 etByte flag_zeropad; /* True if field width constant starts with zero */ 245 etByte flag_long; /* True if "l" flag is present */ 246 etByte flag_longlong; /* True if the "ll" flag is present */ 247 etByte done; /* Loop termination flag */ 248 sqlite_uint64 longvalue; /* Value for integer types */ 249 LONGDOUBLE_TYPE realvalue; /* Value for real types */ 250 const et_info *infop; /* Pointer to the appropriate info structure */ 251 char buf[etBUFSIZE]; /* Conversion buffer */ 252 char prefix; /* Prefix character. "+" or "-" or " " or '\0'. */ 253 etByte xtype = 0; /* Conversion paradigm */ 254 char *zExtra; /* Extra memory used for etTCLESCAPE conversions */ 255 #ifndef SQLITE_OMIT_FLOATING_POINT 256 int exp, e2; /* exponent of real numbers */ 257 double rounder; /* Used for rounding floating point values */ 258 etByte flag_dp; /* True if decimal point should be shown */ 259 etByte flag_rtz; /* True if trailing zeros should be removed */ 260 etByte flag_exp; /* True to force display of the exponent */ 261 int nsd; /* Number of significant digits returned */ 262 #endif 263 264 length = 0; 265 bufpt = 0; 266 for(; (c=(*fmt))!=0; ++fmt){ 267 if( c!='%' ){ 268 int amt; 269 bufpt = (char *)fmt; 270 amt = 1; 271 while( (c=(*++fmt))!='%' && c!=0 ) amt++; 272 sqlite3StrAccumAppend(pAccum, bufpt, amt); 273 if( c==0 ) break; 274 } 275 if( (c=(*++fmt))==0 ){ 276 sqlite3StrAccumAppend(pAccum, "%", 1); 277 break; 278 } 279 /* Find out what flags are present */ 280 flag_leftjustify = flag_plussign = flag_blanksign = 281 flag_alternateform = flag_altform2 = flag_zeropad = 0; 282 done = 0; 283 do{ 284 switch( c ){ 285 case '-': flag_leftjustify = 1; break; 286 case '+': flag_plussign = 1; break; 287 case ' ': flag_blanksign = 1; break; 288 case '#': flag_alternateform = 1; break; 289 case '!': flag_altform2 = 1; break; 290 case '0': flag_zeropad = 1; break; 291 default: done = 1; break; 292 } 293 }while( !done && (c=(*++fmt))!=0 ); 294 /* Get the field width */ 295 width = 0; 296 if( c=='*' ){ 297 width = va_arg(ap,int); 298 if( width<0 ){ 299 flag_leftjustify = 1; 300 width = -width; 301 } 302 c = *++fmt; 303 }else{ 304 while( c>='0' && c<='9' ){ 305 width = width*10 + c - '0'; 306 c = *++fmt; 307 } 308 } 309 if( width > etBUFSIZE-10 ){ 310 width = etBUFSIZE-10; 311 } 312 /* Get the precision */ 313 if( c=='.' ){ 314 precision = 0; 315 c = *++fmt; 316 if( c=='*' ){ 317 precision = va_arg(ap,int); 318 if( precision<0 ) precision = -precision; 319 c = *++fmt; 320 }else{ 321 while( c>='0' && c<='9' ){ 322 precision = precision*10 + c - '0'; 323 c = *++fmt; 324 } 325 } 326 }else{ 327 precision = -1; 328 } 329 /* Get the conversion type modifier */ 330 if( c=='l' ){ 331 flag_long = 1; 332 c = *++fmt; 333 if( c=='l' ){ 334 flag_longlong = 1; 335 c = *++fmt; 336 }else{ 337 flag_longlong = 0; 338 } 339 }else{ 340 flag_long = flag_longlong = 0; 341 } 342 /* Fetch the info entry for the field */ 343 infop = &fmtinfo[0]; 344 xtype = etINVALID; 345 for(idx=0; idx<ArraySize(fmtinfo); idx++){ 346 if( c==fmtinfo[idx].fmttype ){ 347 infop = &fmtinfo[idx]; 348 if( useExtended || (infop->flags & FLAG_INTERN)==0 ){ 349 xtype = infop->type; 350 }else{ 351 return; 352 } 353 break; 354 } 355 } 356 zExtra = 0; 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 = (int)(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 = (int)(&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 = (int)(&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((double)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 = sqlite3Strlen30(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 ?1:0) | 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++) = (char)((exp/100)+'0'); /* 100's digit */ 575 exp %= 100; 576 } 577 *(bufpt++) = (char)(exp/10+'0'); /* 10's digit */ 578 *(bufpt++) = (char)(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 = (int)(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 = va_arg(ap,int); 613 buf[0] = (char)c; 614 if( precision>=0 ){ 615 for(idx=1; idx<precision; idx++) buf[idx] = (char)c; 616 length = precision; 617 }else{ 618 length =1; 619 } 620 bufpt = buf; 621 break; 622 case etSTRING: 623 case etDYNSTRING: 624 bufpt = va_arg(ap,char*); 625 if( bufpt==0 ){ 626 bufpt = ""; 627 }else if( xtype==etDYNSTRING ){ 628 zExtra = bufpt; 629 } 630 if( precision>=0 ){ 631 for(length=0; length<precision && bufpt[length]; length++){} 632 }else{ 633 length = sqlite3Strlen30(bufpt); 634 } 635 break; 636 case etSQLESCAPE: 637 case etSQLESCAPE2: 638 case etSQLESCAPE3: { 639 int i, j, n, isnull; 640 int needQuote; 641 char ch; 642 char q = ((xtype==etSQLESCAPE3)?'"':'\''); /* Quote character */ 643 char *escarg = va_arg(ap,char*); 644 isnull = escarg==0; 645 if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)"); 646 for(i=n=0; (ch=escarg[i])!=0; i++){ 647 if( ch==q ) n++; 648 } 649 needQuote = !isnull && xtype==etSQLESCAPE2; 650 n += i + 1 + needQuote*2; 651 if( n>etBUFSIZE ){ 652 bufpt = zExtra = sqlite3Malloc( n ); 653 if( bufpt==0 ){ 654 pAccum->mallocFailed = 1; 655 return; 656 } 657 }else{ 658 bufpt = buf; 659 } 660 j = 0; 661 if( needQuote ) bufpt[j++] = q; 662 for(i=0; (ch=escarg[i])!=0; i++){ 663 bufpt[j++] = ch; 664 if( ch==q ) bufpt[j++] = ch; 665 } 666 if( needQuote ) bufpt[j++] = q; 667 bufpt[j] = 0; 668 length = j; 669 /* The precision is ignored on %q and %Q */ 670 /* if( precision>=0 && precision<length ) length = precision; */ 671 break; 672 } 673 case etTOKEN: { 674 Token *pToken = va_arg(ap, Token*); 675 if( pToken ){ 676 sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n); 677 } 678 length = width = 0; 679 break; 680 } 681 case etSRCLIST: { 682 SrcList *pSrc = va_arg(ap, SrcList*); 683 int k = va_arg(ap, int); 684 struct SrcList_item *pItem = &pSrc->a[k]; 685 assert( k>=0 && k<pSrc->nSrc ); 686 if( pItem->zDatabase ){ 687 sqlite3StrAccumAppend(pAccum, pItem->zDatabase, -1); 688 sqlite3StrAccumAppend(pAccum, ".", 1); 689 } 690 sqlite3StrAccumAppend(pAccum, pItem->zName, -1); 691 length = width = 0; 692 break; 693 } 694 default: { 695 assert( xtype==etINVALID ); 696 return; 697 } 698 }/* End switch over the format type */ 699 /* 700 ** The text of the conversion is pointed to by "bufpt" and is 701 ** "length" characters long. The field width is "width". Do 702 ** the output. 703 */ 704 if( !flag_leftjustify ){ 705 register int nspace; 706 nspace = width-length; 707 if( nspace>0 ){ 708 appendSpace(pAccum, nspace); 709 } 710 } 711 if( length>0 ){ 712 sqlite3StrAccumAppend(pAccum, bufpt, length); 713 } 714 if( flag_leftjustify ){ 715 register int nspace; 716 nspace = width-length; 717 if( nspace>0 ){ 718 appendSpace(pAccum, nspace); 719 } 720 } 721 if( zExtra ){ 722 sqlite3_free(zExtra); 723 } 724 }/* End for loop over the format string */ 725 } /* End of function */ 726 727 /* 728 ** Append N bytes of text from z to the StrAccum object. 729 */ 730 void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){ 731 assert( z!=0 || N==0 ); 732 if( p->tooBig | p->mallocFailed ){ 733 testcase(p->tooBig); 734 testcase(p->mallocFailed); 735 return; 736 } 737 if( N<0 ){ 738 N = sqlite3Strlen30(z); 739 } 740 if( N==0 || NEVER(z==0) ){ 741 return; 742 } 743 if( p->nChar+N >= p->nAlloc ){ 744 char *zNew; 745 if( !p->useMalloc ){ 746 p->tooBig = 1; 747 N = p->nAlloc - p->nChar - 1; 748 if( N<=0 ){ 749 return; 750 } 751 }else{ 752 i64 szNew = p->nChar; 753 szNew += N + 1; 754 if( szNew > p->mxAlloc ){ 755 sqlite3StrAccumReset(p); 756 p->tooBig = 1; 757 return; 758 }else{ 759 p->nAlloc = (int)szNew; 760 } 761 zNew = sqlite3DbMallocRaw(p->db, p->nAlloc ); 762 if( zNew ){ 763 memcpy(zNew, p->zText, p->nChar); 764 sqlite3StrAccumReset(p); 765 p->zText = zNew; 766 }else{ 767 p->mallocFailed = 1; 768 sqlite3StrAccumReset(p); 769 return; 770 } 771 } 772 } 773 memcpy(&p->zText[p->nChar], z, N); 774 p->nChar += N; 775 } 776 777 /* 778 ** Finish off a string by making sure it is zero-terminated. 779 ** Return a pointer to the resulting string. Return a NULL 780 ** pointer if any kind of error was encountered. 781 */ 782 char *sqlite3StrAccumFinish(StrAccum *p){ 783 if( p->zText ){ 784 p->zText[p->nChar] = 0; 785 if( p->useMalloc && p->zText==p->zBase ){ 786 p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 ); 787 if( p->zText ){ 788 memcpy(p->zText, p->zBase, p->nChar+1); 789 }else{ 790 p->mallocFailed = 1; 791 } 792 } 793 } 794 return p->zText; 795 } 796 797 /* 798 ** Reset an StrAccum string. Reclaim all malloced memory. 799 */ 800 void sqlite3StrAccumReset(StrAccum *p){ 801 if( p->zText!=p->zBase ){ 802 sqlite3DbFree(p->db, p->zText); 803 } 804 p->zText = 0; 805 } 806 807 /* 808 ** Initialize a string accumulator 809 */ 810 void sqlite3StrAccumInit(StrAccum *p, char *zBase, int n, int mx){ 811 p->zText = p->zBase = zBase; 812 p->db = 0; 813 p->nChar = 0; 814 p->nAlloc = n; 815 p->mxAlloc = mx; 816 p->useMalloc = 1; 817 p->tooBig = 0; 818 p->mallocFailed = 0; 819 } 820 821 /* 822 ** Print into memory obtained from sqliteMalloc(). Use the internal 823 ** %-conversion extensions. 824 */ 825 char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){ 826 char *z; 827 char zBase[SQLITE_PRINT_BUF_SIZE]; 828 StrAccum acc; 829 assert( db!=0 ); 830 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), 831 db->aLimit[SQLITE_LIMIT_LENGTH]); 832 acc.db = db; 833 sqlite3VXPrintf(&acc, 1, zFormat, ap); 834 z = sqlite3StrAccumFinish(&acc); 835 if( acc.mallocFailed ){ 836 db->mallocFailed = 1; 837 } 838 return z; 839 } 840 841 /* 842 ** Print into memory obtained from sqliteMalloc(). Use the internal 843 ** %-conversion extensions. 844 */ 845 char *sqlite3MPrintf(sqlite3 *db, const char *zFormat, ...){ 846 va_list ap; 847 char *z; 848 va_start(ap, zFormat); 849 z = sqlite3VMPrintf(db, zFormat, ap); 850 va_end(ap); 851 return z; 852 } 853 854 /* 855 ** Like sqlite3MPrintf(), but call sqlite3DbFree() on zStr after formatting 856 ** the string and before returnning. This routine is intended to be used 857 ** to modify an existing string. For example: 858 ** 859 ** x = sqlite3MPrintf(db, x, "prefix %s suffix", x); 860 ** 861 */ 862 char *sqlite3MAppendf(sqlite3 *db, char *zStr, const char *zFormat, ...){ 863 va_list ap; 864 char *z; 865 va_start(ap, zFormat); 866 z = sqlite3VMPrintf(db, zFormat, ap); 867 va_end(ap); 868 sqlite3DbFree(db, zStr); 869 return z; 870 } 871 872 /* 873 ** Print into memory obtained from sqlite3_malloc(). Omit the internal 874 ** %-conversion extensions. 875 */ 876 char *sqlite3_vmprintf(const char *zFormat, va_list ap){ 877 char *z; 878 char zBase[SQLITE_PRINT_BUF_SIZE]; 879 StrAccum acc; 880 #ifndef SQLITE_OMIT_AUTOINIT 881 if( sqlite3_initialize() ) return 0; 882 #endif 883 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), SQLITE_MAX_LENGTH); 884 sqlite3VXPrintf(&acc, 0, zFormat, ap); 885 z = sqlite3StrAccumFinish(&acc); 886 return z; 887 } 888 889 /* 890 ** Print into memory obtained from sqlite3_malloc()(). Omit the internal 891 ** %-conversion extensions. 892 */ 893 char *sqlite3_mprintf(const char *zFormat, ...){ 894 va_list ap; 895 char *z; 896 #ifndef SQLITE_OMIT_AUTOINIT 897 if( sqlite3_initialize() ) return 0; 898 #endif 899 va_start(ap, zFormat); 900 z = sqlite3_vmprintf(zFormat, ap); 901 va_end(ap); 902 return z; 903 } 904 905 /* 906 ** sqlite3_snprintf() works like snprintf() except that it ignores the 907 ** current locale settings. This is important for SQLite because we 908 ** are not able to use a "," as the decimal point in place of "." as 909 ** specified by some locales. 910 */ 911 char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){ 912 char *z; 913 va_list ap; 914 StrAccum acc; 915 916 if( n<=0 ){ 917 return zBuf; 918 } 919 sqlite3StrAccumInit(&acc, zBuf, n, 0); 920 acc.useMalloc = 0; 921 va_start(ap,zFormat); 922 sqlite3VXPrintf(&acc, 0, zFormat, ap); 923 va_end(ap); 924 z = sqlite3StrAccumFinish(&acc); 925 return z; 926 } 927 928 #if defined(SQLITE_DEBUG) 929 /* 930 ** A version of printf() that understands %lld. Used for debugging. 931 ** The printf() built into some versions of windows does not understand %lld 932 ** and segfaults if you give it a long long int. 933 */ 934 void sqlite3DebugPrintf(const char *zFormat, ...){ 935 va_list ap; 936 StrAccum acc; 937 char zBuf[500]; 938 sqlite3StrAccumInit(&acc, zBuf, sizeof(zBuf), 0); 939 acc.useMalloc = 0; 940 va_start(ap,zFormat); 941 sqlite3VXPrintf(&acc, 0, zFormat, ap); 942 va_end(ap); 943 sqlite3StrAccumFinish(&acc); 944 fprintf(stdout,"%s", zBuf); 945 fflush(stdout); 946 } 947 #endif 948