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 They are very out-of-date but might be useful as 5 ** an historical reference.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 1.104 2009/06/03 01:24:54 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. 193 */ 194 #ifndef SQLITE_PRINT_BUF_SIZE 195 # if defined(SQLITE_SMALL_STACK) 196 # define SQLITE_PRINT_BUF_SIZE 50 197 # else 198 # define SQLITE_PRINT_BUF_SIZE 350 199 # endif 200 #endif 201 #define etBUFSIZE SQLITE_PRINT_BUF_SIZE /* Size of the output buffer */ 202 203 /* 204 ** The root program. All variations call this core. 205 ** 206 ** INPUTS: 207 ** func This is a pointer to a function taking three arguments 208 ** 1. A pointer to anything. Same as the "arg" parameter. 209 ** 2. A pointer to the list of characters to be output 210 ** (Note, this list is NOT null terminated.) 211 ** 3. An integer number of characters to be output. 212 ** (Note: This number might be zero.) 213 ** 214 ** arg This is the pointer to anything which will be passed as the 215 ** first argument to "func". Use it for whatever you like. 216 ** 217 ** fmt This is the format string, as in the usual print. 218 ** 219 ** ap This is a pointer to a list of arguments. Same as in 220 ** vfprint. 221 ** 222 ** OUTPUTS: 223 ** The return value is the total number of characters sent to 224 ** the function "func". Returns -1 on a error. 225 ** 226 ** Note that the order in which automatic variables are declared below 227 ** seems to make a big difference in determining how fast this beast 228 ** will run. 229 */ 230 void sqlite3VXPrintf( 231 StrAccum *pAccum, /* Accumulate results here */ 232 int useExtended, /* Allow extended %-conversions */ 233 const char *fmt, /* Format string */ 234 va_list ap /* arguments */ 235 ){ 236 int c; /* Next character in the format string */ 237 char *bufpt; /* Pointer to the conversion buffer */ 238 int precision; /* Precision of the current field */ 239 int length; /* Length of the field */ 240 int idx; /* A general purpose loop counter */ 241 int width; /* Width of the current field */ 242 etByte flag_leftjustify; /* True if "-" flag is present */ 243 etByte flag_plussign; /* True if "+" flag is present */ 244 etByte flag_blanksign; /* True if " " flag is present */ 245 etByte flag_alternateform; /* True if "#" flag is present */ 246 etByte flag_altform2; /* True if "!" flag is present */ 247 etByte flag_zeropad; /* True if field width constant starts with zero */ 248 etByte flag_long; /* True if "l" flag is present */ 249 etByte flag_longlong; /* True if the "ll" flag is present */ 250 etByte done; /* Loop termination flag */ 251 sqlite_uint64 longvalue; /* Value for integer types */ 252 LONGDOUBLE_TYPE realvalue; /* Value for real types */ 253 const et_info *infop; /* Pointer to the appropriate info structure */ 254 char buf[etBUFSIZE]; /* Conversion buffer */ 255 char prefix; /* Prefix character. "+" or "-" or " " or '\0'. */ 256 etByte xtype = 0; /* Conversion paradigm */ 257 char *zExtra; /* Extra memory used for etTCLESCAPE conversions */ 258 #ifndef SQLITE_OMIT_FLOATING_POINT 259 int exp, e2; /* exponent of real numbers */ 260 double rounder; /* Used for rounding floating point values */ 261 etByte flag_dp; /* True if decimal point should be shown */ 262 etByte flag_rtz; /* True if trailing zeros should be removed */ 263 etByte flag_exp; /* True to force display of the exponent */ 264 int nsd; /* Number of significant digits returned */ 265 #endif 266 267 length = 0; 268 bufpt = 0; 269 for(; (c=(*fmt))!=0; ++fmt){ 270 if( c!='%' ){ 271 int amt; 272 bufpt = (char *)fmt; 273 amt = 1; 274 while( (c=(*++fmt))!='%' && c!=0 ) amt++; 275 sqlite3StrAccumAppend(pAccum, bufpt, amt); 276 if( c==0 ) break; 277 } 278 if( (c=(*++fmt))==0 ){ 279 sqlite3StrAccumAppend(pAccum, "%", 1); 280 break; 281 } 282 /* Find out what flags are present */ 283 flag_leftjustify = flag_plussign = flag_blanksign = 284 flag_alternateform = flag_altform2 = flag_zeropad = 0; 285 done = 0; 286 do{ 287 switch( c ){ 288 case '-': flag_leftjustify = 1; break; 289 case '+': flag_plussign = 1; break; 290 case ' ': flag_blanksign = 1; break; 291 case '#': flag_alternateform = 1; break; 292 case '!': flag_altform2 = 1; break; 293 case '0': flag_zeropad = 1; break; 294 default: done = 1; break; 295 } 296 }while( !done && (c=(*++fmt))!=0 ); 297 /* Get the field width */ 298 width = 0; 299 if( c=='*' ){ 300 width = va_arg(ap,int); 301 if( width<0 ){ 302 flag_leftjustify = 1; 303 width = -width; 304 } 305 c = *++fmt; 306 }else{ 307 while( c>='0' && c<='9' ){ 308 width = width*10 + c - '0'; 309 c = *++fmt; 310 } 311 } 312 if( width > etBUFSIZE-10 ){ 313 width = etBUFSIZE-10; 314 } 315 /* Get the precision */ 316 if( c=='.' ){ 317 precision = 0; 318 c = *++fmt; 319 if( c=='*' ){ 320 precision = va_arg(ap,int); 321 if( precision<0 ) precision = -precision; 322 c = *++fmt; 323 }else{ 324 while( c>='0' && c<='9' ){ 325 precision = precision*10 + c - '0'; 326 c = *++fmt; 327 } 328 } 329 }else{ 330 precision = -1; 331 } 332 /* Get the conversion type modifier */ 333 if( c=='l' ){ 334 flag_long = 1; 335 c = *++fmt; 336 if( c=='l' ){ 337 flag_longlong = 1; 338 c = *++fmt; 339 }else{ 340 flag_longlong = 0; 341 } 342 }else{ 343 flag_long = flag_longlong = 0; 344 } 345 /* Fetch the info entry for the field */ 346 infop = &fmtinfo[0]; 347 xtype = etINVALID; 348 for(idx=0; idx<ArraySize(fmtinfo); idx++){ 349 if( c==fmtinfo[idx].fmttype ){ 350 infop = &fmtinfo[idx]; 351 if( useExtended || (infop->flags & FLAG_INTERN)==0 ){ 352 xtype = infop->type; 353 }else{ 354 return; 355 } 356 break; 357 } 358 } 359 zExtra = 0; 360 361 362 /* Limit the precision to prevent overflowing buf[] during conversion */ 363 if( precision>etBUFSIZE-40 && (infop->flags & FLAG_STRING)==0 ){ 364 precision = etBUFSIZE-40; 365 } 366 367 /* 368 ** At this point, variables are initialized as follows: 369 ** 370 ** flag_alternateform TRUE if a '#' is present. 371 ** flag_altform2 TRUE if a '!' is present. 372 ** flag_plussign TRUE if a '+' is present. 373 ** flag_leftjustify TRUE if a '-' is present or if the 374 ** field width was negative. 375 ** flag_zeropad TRUE if the width began with 0. 376 ** flag_long TRUE if the letter 'l' (ell) prefixed 377 ** the conversion character. 378 ** flag_longlong TRUE if the letter 'll' (ell ell) prefixed 379 ** the conversion character. 380 ** flag_blanksign TRUE if a ' ' is present. 381 ** width The specified field width. This is 382 ** always non-negative. Zero is the default. 383 ** precision The specified precision. The default 384 ** is -1. 385 ** xtype The class of the conversion. 386 ** infop Pointer to the appropriate info struct. 387 */ 388 switch( xtype ){ 389 case etPOINTER: 390 flag_longlong = sizeof(char*)==sizeof(i64); 391 flag_long = sizeof(char*)==sizeof(long int); 392 /* Fall through into the next case */ 393 case etORDINAL: 394 case etRADIX: 395 if( infop->flags & FLAG_SIGNED ){ 396 i64 v; 397 if( flag_longlong ){ 398 v = va_arg(ap,i64); 399 }else if( flag_long ){ 400 v = va_arg(ap,long int); 401 }else{ 402 v = va_arg(ap,int); 403 } 404 if( v<0 ){ 405 longvalue = -v; 406 prefix = '-'; 407 }else{ 408 longvalue = v; 409 if( flag_plussign ) prefix = '+'; 410 else if( flag_blanksign ) prefix = ' '; 411 else prefix = 0; 412 } 413 }else{ 414 if( flag_longlong ){ 415 longvalue = va_arg(ap,u64); 416 }else if( flag_long ){ 417 longvalue = va_arg(ap,unsigned long int); 418 }else{ 419 longvalue = va_arg(ap,unsigned int); 420 } 421 prefix = 0; 422 } 423 if( longvalue==0 ) flag_alternateform = 0; 424 if( flag_zeropad && precision<width-(prefix!=0) ){ 425 precision = width-(prefix!=0); 426 } 427 bufpt = &buf[etBUFSIZE-1]; 428 if( xtype==etORDINAL ){ 429 static const char zOrd[] = "thstndrd"; 430 int x = (int)(longvalue % 10); 431 if( x>=4 || (longvalue/10)%10==1 ){ 432 x = 0; 433 } 434 buf[etBUFSIZE-3] = zOrd[x*2]; 435 buf[etBUFSIZE-2] = zOrd[x*2+1]; 436 bufpt -= 2; 437 } 438 { 439 register const char *cset; /* Use registers for speed */ 440 register int base; 441 cset = &aDigits[infop->charset]; 442 base = infop->base; 443 do{ /* Convert to ascii */ 444 *(--bufpt) = cset[longvalue%base]; 445 longvalue = longvalue/base; 446 }while( longvalue>0 ); 447 } 448 length = (int)(&buf[etBUFSIZE-1]-bufpt); 449 for(idx=precision-length; idx>0; idx--){ 450 *(--bufpt) = '0'; /* Zero pad */ 451 } 452 if( prefix ) *(--bufpt) = prefix; /* Add sign */ 453 if( flag_alternateform && infop->prefix ){ /* Add "0" or "0x" */ 454 const char *pre; 455 char x; 456 pre = &aPrefix[infop->prefix]; 457 for(; (x=(*pre))!=0; pre++) *(--bufpt) = x; 458 } 459 length = (int)(&buf[etBUFSIZE-1]-bufpt); 460 break; 461 case etFLOAT: 462 case etEXP: 463 case etGENERIC: 464 realvalue = va_arg(ap,double); 465 #ifndef SQLITE_OMIT_FLOATING_POINT 466 if( precision<0 ) precision = 6; /* Set default precision */ 467 if( precision>etBUFSIZE/2-10 ) precision = etBUFSIZE/2-10; 468 if( realvalue<0.0 ){ 469 realvalue = -realvalue; 470 prefix = '-'; 471 }else{ 472 if( flag_plussign ) prefix = '+'; 473 else if( flag_blanksign ) prefix = ' '; 474 else prefix = 0; 475 } 476 if( xtype==etGENERIC && precision>0 ) precision--; 477 #if 0 478 /* Rounding works like BSD when the constant 0.4999 is used. Wierd! */ 479 for(idx=precision, rounder=0.4999; idx>0; idx--, rounder*=0.1); 480 #else 481 /* It makes more sense to use 0.5 */ 482 for(idx=precision, rounder=0.5; idx>0; idx--, rounder*=0.1){} 483 #endif 484 if( xtype==etFLOAT ) realvalue += rounder; 485 /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */ 486 exp = 0; 487 if( sqlite3IsNaN((double)realvalue) ){ 488 bufpt = "NaN"; 489 length = 3; 490 break; 491 } 492 if( realvalue>0.0 ){ 493 while( realvalue>=1e32 && exp<=350 ){ realvalue *= 1e-32; exp+=32; } 494 while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; } 495 while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; } 496 while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; } 497 while( realvalue<1.0 ){ realvalue *= 10.0; exp--; } 498 if( exp>350 ){ 499 if( prefix=='-' ){ 500 bufpt = "-Inf"; 501 }else if( prefix=='+' ){ 502 bufpt = "+Inf"; 503 }else{ 504 bufpt = "Inf"; 505 } 506 length = sqlite3Strlen30(bufpt); 507 break; 508 } 509 } 510 bufpt = buf; 511 /* 512 ** If the field type is etGENERIC, then convert to either etEXP 513 ** or etFLOAT, as appropriate. 514 */ 515 flag_exp = xtype==etEXP; 516 if( xtype!=etFLOAT ){ 517 realvalue += rounder; 518 if( realvalue>=10.0 ){ realvalue *= 0.1; exp++; } 519 } 520 if( xtype==etGENERIC ){ 521 flag_rtz = !flag_alternateform; 522 if( exp<-4 || exp>precision ){ 523 xtype = etEXP; 524 }else{ 525 precision = precision - exp; 526 xtype = etFLOAT; 527 } 528 }else{ 529 flag_rtz = 0; 530 } 531 if( xtype==etEXP ){ 532 e2 = 0; 533 }else{ 534 e2 = exp; 535 } 536 nsd = 0; 537 flag_dp = (precision>0 ?1:0) | flag_alternateform | flag_altform2; 538 /* The sign in front of the number */ 539 if( prefix ){ 540 *(bufpt++) = prefix; 541 } 542 /* Digits prior to the decimal point */ 543 if( e2<0 ){ 544 *(bufpt++) = '0'; 545 }else{ 546 for(; e2>=0; e2--){ 547 *(bufpt++) = et_getdigit(&realvalue,&nsd); 548 } 549 } 550 /* The decimal point */ 551 if( flag_dp ){ 552 *(bufpt++) = '.'; 553 } 554 /* "0" digits after the decimal point but before the first 555 ** significant digit of the number */ 556 for(e2++; e2<0; precision--, e2++){ 557 assert( precision>0 ); 558 *(bufpt++) = '0'; 559 } 560 /* Significant digits after the decimal point */ 561 while( (precision--)>0 ){ 562 *(bufpt++) = et_getdigit(&realvalue,&nsd); 563 } 564 /* Remove trailing zeros and the "." if no digits follow the "." */ 565 if( flag_rtz && flag_dp ){ 566 while( bufpt[-1]=='0' ) *(--bufpt) = 0; 567 assert( bufpt>buf ); 568 if( bufpt[-1]=='.' ){ 569 if( flag_altform2 ){ 570 *(bufpt++) = '0'; 571 }else{ 572 *(--bufpt) = 0; 573 } 574 } 575 } 576 /* Add the "eNNN" suffix */ 577 if( flag_exp || xtype==etEXP ){ 578 *(bufpt++) = aDigits[infop->charset]; 579 if( exp<0 ){ 580 *(bufpt++) = '-'; exp = -exp; 581 }else{ 582 *(bufpt++) = '+'; 583 } 584 if( exp>=100 ){ 585 *(bufpt++) = (char)((exp/100)+'0'); /* 100's digit */ 586 exp %= 100; 587 } 588 *(bufpt++) = (char)(exp/10+'0'); /* 10's digit */ 589 *(bufpt++) = (char)(exp%10+'0'); /* 1's digit */ 590 } 591 *bufpt = 0; 592 593 /* The converted number is in buf[] and zero terminated. Output it. 594 ** Note that the number is in the usual order, not reversed as with 595 ** integer conversions. */ 596 length = (int)(bufpt-buf); 597 bufpt = buf; 598 599 /* Special case: Add leading zeros if the flag_zeropad flag is 600 ** set and we are not left justified */ 601 if( flag_zeropad && !flag_leftjustify && length < width){ 602 int i; 603 int nPad = width - length; 604 for(i=width; i>=nPad; i--){ 605 bufpt[i] = bufpt[i-nPad]; 606 } 607 i = prefix!=0; 608 while( nPad-- ) bufpt[i++] = '0'; 609 length = width; 610 } 611 #endif 612 break; 613 case etSIZE: 614 *(va_arg(ap,int*)) = pAccum->nChar; 615 length = width = 0; 616 break; 617 case etPERCENT: 618 buf[0] = '%'; 619 bufpt = buf; 620 length = 1; 621 break; 622 case etCHARX: 623 c = va_arg(ap,int); 624 buf[0] = (char)c; 625 if( precision>=0 ){ 626 for(idx=1; idx<precision; idx++) buf[idx] = (char)c; 627 length = precision; 628 }else{ 629 length =1; 630 } 631 bufpt = buf; 632 break; 633 case etSTRING: 634 case etDYNSTRING: 635 bufpt = va_arg(ap,char*); 636 if( bufpt==0 ){ 637 bufpt = ""; 638 }else if( xtype==etDYNSTRING ){ 639 zExtra = bufpt; 640 } 641 if( precision>=0 ){ 642 for(length=0; length<precision && bufpt[length]; length++){} 643 }else{ 644 length = sqlite3Strlen30(bufpt); 645 } 646 break; 647 case etSQLESCAPE: 648 case etSQLESCAPE2: 649 case etSQLESCAPE3: { 650 int i, j, n, isnull; 651 int needQuote; 652 char ch; 653 char q = ((xtype==etSQLESCAPE3)?'"':'\''); /* Quote character */ 654 char *escarg = va_arg(ap,char*); 655 isnull = escarg==0; 656 if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)"); 657 for(i=n=0; (ch=escarg[i])!=0; i++){ 658 if( ch==q ) n++; 659 } 660 needQuote = !isnull && xtype==etSQLESCAPE2; 661 n += i + 1 + needQuote*2; 662 if( n>etBUFSIZE ){ 663 bufpt = zExtra = sqlite3Malloc( n ); 664 if( bufpt==0 ){ 665 pAccum->mallocFailed = 1; 666 return; 667 } 668 }else{ 669 bufpt = buf; 670 } 671 j = 0; 672 if( needQuote ) bufpt[j++] = q; 673 for(i=0; (ch=escarg[i])!=0; i++){ 674 bufpt[j++] = ch; 675 if( ch==q ) bufpt[j++] = ch; 676 } 677 if( needQuote ) bufpt[j++] = q; 678 bufpt[j] = 0; 679 length = j; 680 /* The precision is ignored on %q and %Q */ 681 /* if( precision>=0 && precision<length ) length = precision; */ 682 break; 683 } 684 case etTOKEN: { 685 Token *pToken = va_arg(ap, Token*); 686 if( pToken ){ 687 sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n); 688 } 689 length = width = 0; 690 break; 691 } 692 case etSRCLIST: { 693 SrcList *pSrc = va_arg(ap, SrcList*); 694 int k = va_arg(ap, int); 695 struct SrcList_item *pItem = &pSrc->a[k]; 696 assert( k>=0 && k<pSrc->nSrc ); 697 if( pItem->zDatabase ){ 698 sqlite3StrAccumAppend(pAccum, pItem->zDatabase, -1); 699 sqlite3StrAccumAppend(pAccum, ".", 1); 700 } 701 sqlite3StrAccumAppend(pAccum, pItem->zName, -1); 702 length = width = 0; 703 break; 704 } 705 default: { 706 assert( xtype==etINVALID ); 707 return; 708 } 709 }/* End switch over the format type */ 710 /* 711 ** The text of the conversion is pointed to by "bufpt" and is 712 ** "length" characters long. The field width is "width". Do 713 ** the output. 714 */ 715 if( !flag_leftjustify ){ 716 register int nspace; 717 nspace = width-length; 718 if( nspace>0 ){ 719 appendSpace(pAccum, nspace); 720 } 721 } 722 if( length>0 ){ 723 sqlite3StrAccumAppend(pAccum, bufpt, length); 724 } 725 if( flag_leftjustify ){ 726 register int nspace; 727 nspace = width-length; 728 if( nspace>0 ){ 729 appendSpace(pAccum, nspace); 730 } 731 } 732 if( zExtra ){ 733 sqlite3_free(zExtra); 734 } 735 }/* End for loop over the format string */ 736 } /* End of function */ 737 738 /* 739 ** Append N bytes of text from z to the StrAccum object. 740 */ 741 void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){ 742 assert( z!=0 || N==0 ); 743 if( p->tooBig | p->mallocFailed ){ 744 testcase(p->tooBig); 745 testcase(p->mallocFailed); 746 return; 747 } 748 if( N<0 ){ 749 N = sqlite3Strlen30(z); 750 } 751 if( N==0 || NEVER(z==0) ){ 752 return; 753 } 754 if( p->nChar+N >= p->nAlloc ){ 755 char *zNew; 756 if( !p->useMalloc ){ 757 p->tooBig = 1; 758 N = p->nAlloc - p->nChar - 1; 759 if( N<=0 ){ 760 return; 761 } 762 }else{ 763 i64 szNew = p->nChar; 764 szNew += N + 1; 765 if( szNew > p->mxAlloc ){ 766 sqlite3StrAccumReset(p); 767 p->tooBig = 1; 768 return; 769 }else{ 770 p->nAlloc = (int)szNew; 771 } 772 zNew = sqlite3DbMallocRaw(p->db, p->nAlloc ); 773 if( zNew ){ 774 memcpy(zNew, p->zText, p->nChar); 775 sqlite3StrAccumReset(p); 776 p->zText = zNew; 777 }else{ 778 p->mallocFailed = 1; 779 sqlite3StrAccumReset(p); 780 return; 781 } 782 } 783 } 784 memcpy(&p->zText[p->nChar], z, N); 785 p->nChar += N; 786 } 787 788 /* 789 ** Finish off a string by making sure it is zero-terminated. 790 ** Return a pointer to the resulting string. Return a NULL 791 ** pointer if any kind of error was encountered. 792 */ 793 char *sqlite3StrAccumFinish(StrAccum *p){ 794 if( p->zText ){ 795 p->zText[p->nChar] = 0; 796 if( p->useMalloc && p->zText==p->zBase ){ 797 p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 ); 798 if( p->zText ){ 799 memcpy(p->zText, p->zBase, p->nChar+1); 800 }else{ 801 p->mallocFailed = 1; 802 } 803 } 804 } 805 return p->zText; 806 } 807 808 /* 809 ** Reset an StrAccum string. Reclaim all malloced memory. 810 */ 811 void sqlite3StrAccumReset(StrAccum *p){ 812 if( p->zText!=p->zBase ){ 813 sqlite3DbFree(p->db, p->zText); 814 } 815 p->zText = 0; 816 } 817 818 /* 819 ** Initialize a string accumulator 820 */ 821 void sqlite3StrAccumInit(StrAccum *p, char *zBase, int n, int mx){ 822 p->zText = p->zBase = zBase; 823 p->db = 0; 824 p->nChar = 0; 825 p->nAlloc = n; 826 p->mxAlloc = mx; 827 p->useMalloc = 1; 828 p->tooBig = 0; 829 p->mallocFailed = 0; 830 } 831 832 /* 833 ** Print into memory obtained from sqliteMalloc(). Use the internal 834 ** %-conversion extensions. 835 */ 836 char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){ 837 char *z; 838 char zBase[SQLITE_PRINT_BUF_SIZE]; 839 StrAccum acc; 840 assert( db!=0 ); 841 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), 842 db->aLimit[SQLITE_LIMIT_LENGTH]); 843 acc.db = db; 844 sqlite3VXPrintf(&acc, 1, zFormat, ap); 845 z = sqlite3StrAccumFinish(&acc); 846 if( acc.mallocFailed ){ 847 db->mallocFailed = 1; 848 } 849 return z; 850 } 851 852 /* 853 ** Print into memory obtained from sqliteMalloc(). Use the internal 854 ** %-conversion extensions. 855 */ 856 char *sqlite3MPrintf(sqlite3 *db, const char *zFormat, ...){ 857 va_list ap; 858 char *z; 859 va_start(ap, zFormat); 860 z = sqlite3VMPrintf(db, zFormat, ap); 861 va_end(ap); 862 return z; 863 } 864 865 /* 866 ** Like sqlite3MPrintf(), but call sqlite3DbFree() on zStr after formatting 867 ** the string and before returnning. This routine is intended to be used 868 ** to modify an existing string. For example: 869 ** 870 ** x = sqlite3MPrintf(db, x, "prefix %s suffix", x); 871 ** 872 */ 873 char *sqlite3MAppendf(sqlite3 *db, char *zStr, const char *zFormat, ...){ 874 va_list ap; 875 char *z; 876 va_start(ap, zFormat); 877 z = sqlite3VMPrintf(db, zFormat, ap); 878 va_end(ap); 879 sqlite3DbFree(db, zStr); 880 return z; 881 } 882 883 /* 884 ** Print into memory obtained from sqlite3_malloc(). Omit the internal 885 ** %-conversion extensions. 886 */ 887 char *sqlite3_vmprintf(const char *zFormat, va_list ap){ 888 char *z; 889 char zBase[SQLITE_PRINT_BUF_SIZE]; 890 StrAccum acc; 891 #ifndef SQLITE_OMIT_AUTOINIT 892 if( sqlite3_initialize() ) return 0; 893 #endif 894 sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), SQLITE_MAX_LENGTH); 895 sqlite3VXPrintf(&acc, 0, zFormat, ap); 896 z = sqlite3StrAccumFinish(&acc); 897 return z; 898 } 899 900 /* 901 ** Print into memory obtained from sqlite3_malloc()(). Omit the internal 902 ** %-conversion extensions. 903 */ 904 char *sqlite3_mprintf(const char *zFormat, ...){ 905 va_list ap; 906 char *z; 907 #ifndef SQLITE_OMIT_AUTOINIT 908 if( sqlite3_initialize() ) return 0; 909 #endif 910 va_start(ap, zFormat); 911 z = sqlite3_vmprintf(zFormat, ap); 912 va_end(ap); 913 return z; 914 } 915 916 /* 917 ** sqlite3_snprintf() works like snprintf() except that it ignores the 918 ** current locale settings. This is important for SQLite because we 919 ** are not able to use a "," as the decimal point in place of "." as 920 ** specified by some locales. 921 */ 922 char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){ 923 char *z; 924 va_list ap; 925 StrAccum acc; 926 927 if( n<=0 ){ 928 return zBuf; 929 } 930 sqlite3StrAccumInit(&acc, zBuf, n, 0); 931 acc.useMalloc = 0; 932 va_start(ap,zFormat); 933 sqlite3VXPrintf(&acc, 0, zFormat, ap); 934 va_end(ap); 935 z = sqlite3StrAccumFinish(&acc); 936 return z; 937 } 938 939 #if defined(SQLITE_DEBUG) 940 /* 941 ** A version of printf() that understands %lld. Used for debugging. 942 ** The printf() built into some versions of windows does not understand %lld 943 ** and segfaults if you give it a long long int. 944 */ 945 void sqlite3DebugPrintf(const char *zFormat, ...){ 946 va_list ap; 947 StrAccum acc; 948 char zBuf[500]; 949 sqlite3StrAccumInit(&acc, zBuf, sizeof(zBuf), 0); 950 acc.useMalloc = 0; 951 va_start(ap,zFormat); 952 sqlite3VXPrintf(&acc, 0, zFormat, ap); 953 va_end(ap); 954 sqlite3StrAccumFinish(&acc); 955 fprintf(stdout,"%s", zBuf); 956 fflush(stdout); 957 } 958 #endif 959