1 /* $OpenBSD: vfprintf.c,v 1.37 2006/01/13 17:56:18 millert Exp $ */ 2 /*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Actual printf innards. 36 * 37 * This code is large and complicated... 38 */ 39 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 43 #include <errno.h> 44 #include <stdarg.h> 45 #include <stddef.h> 46 #include <stdio.h> 47 #include <stdint.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "local.h" 52 #include "fvwrite.h" 53 54 static void __find_arguments(const char *fmt0, va_list ap, va_list **argtable, 55 size_t *argtablesiz); 56 static int __grow_type_table(unsigned char **typetable, int *tablesize); 57 58 /* 59 * Flush out all the vectors defined by the given uio, 60 * then reset it so that it can be reused. 61 */ 62 static int 63 __sprint(FILE *fp, struct __suio *uio) 64 { 65 int err; 66 67 if (uio->uio_resid == 0) { 68 uio->uio_iovcnt = 0; 69 return (0); 70 } 71 err = __sfvwrite(fp, uio); 72 uio->uio_resid = 0; 73 uio->uio_iovcnt = 0; 74 return (err); 75 } 76 77 /* 78 * Helper function for `fprintf to unbuffered unix file': creates a 79 * temporary buffer. We only work on write-only files; this avoids 80 * worries about ungetc buffers and so forth. 81 */ 82 static int 83 __sbprintf(FILE *fp, const char *fmt, va_list ap) 84 { 85 int ret; 86 FILE fake; 87 struct __sfileext fakeext; 88 unsigned char buf[BUFSIZ]; 89 90 _FILEEXT_SETUP(&fake, &fakeext); 91 /* copy the important variables */ 92 fake._flags = fp->_flags & ~__SNBF; 93 fake._file = fp->_file; 94 fake._cookie = fp->_cookie; 95 fake._write = fp->_write; 96 97 /* set up the buffer */ 98 fake._bf._base = fake._p = buf; 99 fake._bf._size = fake._w = sizeof(buf); 100 fake._lbfsize = 0; /* not actually used, but Just In Case */ 101 102 /* do the work, then copy any error status */ 103 ret = __vfprintf(&fake, fmt, ap); 104 if (ret >= 0 && __sflush(&fake)) 105 ret = EOF; 106 if (fake._flags & __SERR) 107 fp->_flags |= __SERR; 108 return (ret); 109 } 110 111 112 #ifdef FLOATING_POINT 113 #include <locale.h> 114 #include <math.h> 115 #include "floatio.h" 116 117 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 118 #define DEFPREC 6 119 120 static char *cvt(double, int, int, char *, int *, int, int *); 121 static int exponent(char *, int, int); 122 #else /* no FLOATING_POINT */ 123 #define BUF 40 124 #endif /* FLOATING_POINT */ 125 126 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 127 128 /* BIONIC: do not link libm for only two rather simple functions */ 129 #ifdef FLOATING_POINT 130 static int _my_isinf(double); 131 static int _my_isnan(double); 132 #endif 133 134 /* 135 * Macros for converting digits to letters and vice versa 136 */ 137 #define to_digit(c) ((c) - '0') 138 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 139 #define to_char(n) ((n) + '0') 140 141 /* 142 * Flags used during conversion. 143 */ 144 #define ALT 0x0001 /* alternate form */ 145 #define HEXPREFIX 0x0002 /* add 0x or 0X prefix */ 146 #define LADJUST 0x0004 /* left adjustment */ 147 #define LONGDBL 0x0008 /* long double; unimplemented */ 148 #define LONGINT 0x0010 /* long integer */ 149 #define LLONGINT 0x0020 /* long long integer */ 150 #define SHORTINT 0x0040 /* short integer */ 151 #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */ 152 #define FPT 0x0100 /* Floating point number */ 153 #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */ 154 #define SIZEINT 0x0400 /* (signed) size_t */ 155 #define CHARINT 0x0800 /* 8 bit integer */ 156 #define MAXINT 0x1000 /* largest integer size (intmax_t) */ 157 158 int 159 vfprintf(FILE *fp, const char *fmt0, __va_list ap) 160 { 161 int ret; 162 163 FLOCKFILE(fp); 164 ret = __vfprintf(fp, fmt0, ap); 165 FUNLOCKFILE(fp); 166 return (ret); 167 } 168 169 int 170 __vfprintf(FILE *fp, const char *fmt0, __va_list ap) 171 { 172 char *fmt; /* format string */ 173 int ch; /* character from fmt */ 174 int n, m, n2; /* handy integers (short term usage) */ 175 char *cp; /* handy char pointer (short term usage) */ 176 char *cp_free = NULL; /* BIONIC: copy of cp to be freed after usage */ 177 struct __siov *iovp;/* for PRINT macro */ 178 int flags; /* flags as above */ 179 int ret; /* return value accumulator */ 180 int width; /* width from format (%8d), or 0 */ 181 int prec; /* precision from format (%.3d), or -1 */ 182 char sign; /* sign prefix (' ', '+', '-', or \0) */ 183 wchar_t wc; 184 void* ps; 185 #ifdef FLOATING_POINT 186 char *decimal_point = "."; 187 char softsign; /* temporary negative sign for floats */ 188 double _double = 0.; /* double precision arguments %[eEfgG] */ 189 int expt; /* integer value of exponent */ 190 int expsize = 0; /* character count for expstr */ 191 int ndig; /* actual number of digits returned by cvt */ 192 char expstr[7]; /* buffer for exponent string */ 193 #endif 194 195 uintmax_t _umax; /* integer arguments %[diouxX] */ 196 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 197 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 198 int realsz; /* field size expanded by dprec */ 199 int size; /* size of converted field or string */ 200 char* xdigs = NULL; /* digits for [xX] conversion */ 201 #define NIOV 8 202 struct __suio uio; /* output information: summary */ 203 struct __siov iov[NIOV];/* ... and individual io vectors */ 204 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 205 char ox[2]; /* space for 0x hex-prefix */ 206 va_list *argtable; /* args, built due to positional arg */ 207 va_list statargtable[STATIC_ARG_TBL_SIZE]; 208 size_t argtablesiz; 209 int nextarg; /* 1-based argument index */ 210 va_list orgap; /* original argument pointer */ 211 /* 212 * Choose PADSIZE to trade efficiency vs. size. If larger printf 213 * fields occur frequently, increase PADSIZE and make the initialisers 214 * below longer. 215 */ 216 #define PADSIZE 16 /* pad chunk size */ 217 static const char blanks[PADSIZE] = 218 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 219 static const char zeroes[PADSIZE] = 220 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 221 222 /* 223 * BEWARE, these `goto error' on error, and PAD uses `n'. 224 */ 225 #define PRINT(ptr, len) do { \ 226 iovp->iov_base = (ptr); \ 227 iovp->iov_len = (len); \ 228 uio.uio_resid += (len); \ 229 iovp++; \ 230 if (++uio.uio_iovcnt >= NIOV) { \ 231 if (__sprint(fp, &uio)) \ 232 goto error; \ 233 iovp = iov; \ 234 } \ 235 } while (0) 236 #define PAD(howmany, with) do { \ 237 if ((n = (howmany)) > 0) { \ 238 while (n > PADSIZE) { \ 239 PRINT(with, PADSIZE); \ 240 n -= PADSIZE; \ 241 } \ 242 PRINT(with, n); \ 243 } \ 244 } while (0) 245 #define FLUSH() do { \ 246 if (uio.uio_resid && __sprint(fp, &uio)) \ 247 goto error; \ 248 uio.uio_iovcnt = 0; \ 249 iovp = iov; \ 250 } while (0) 251 252 /* 253 * To extend shorts properly, we need both signed and unsigned 254 * argument extraction methods. 255 */ 256 #define SARG() \ 257 ((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \ 258 flags&LLONGINT ? GETARG(long long) : \ 259 flags&LONGINT ? GETARG(long) : \ 260 flags&PTRINT ? GETARG(ptrdiff_t) : \ 261 flags&SIZEINT ? GETARG(ssize_t) : \ 262 flags&SHORTINT ? (short)GETARG(int) : \ 263 flags&CHARINT ? (__signed char)GETARG(int) : \ 264 GETARG(int))) 265 #define UARG() \ 266 ((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \ 267 flags&LLONGINT ? GETARG(unsigned long long) : \ 268 flags&LONGINT ? GETARG(unsigned long) : \ 269 flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \ 270 flags&SIZEINT ? GETARG(size_t) : \ 271 flags&SHORTINT ? (unsigned short)GETARG(int) : \ 272 flags&CHARINT ? (unsigned char)GETARG(int) : \ 273 GETARG(unsigned int))) 274 275 /* 276 * Get * arguments, including the form *nn$. Preserve the nextarg 277 * that the argument can be gotten once the type is determined. 278 */ 279 #define GETASTER(val) \ 280 n2 = 0; \ 281 cp = fmt; \ 282 while (is_digit(*cp)) { \ 283 n2 = 10 * n2 + to_digit(*cp); \ 284 cp++; \ 285 } \ 286 if (*cp == '$') { \ 287 int hold = nextarg; \ 288 if (argtable == NULL) { \ 289 argtable = statargtable; \ 290 __find_arguments(fmt0, orgap, &argtable, &argtablesiz); \ 291 } \ 292 nextarg = n2; \ 293 val = GETARG(int); \ 294 nextarg = hold; \ 295 fmt = ++cp; \ 296 } else { \ 297 val = GETARG(int); \ 298 } 299 300 /* 301 * Get the argument indexed by nextarg. If the argument table is 302 * built, use it to get the argument. If its not, get the next 303 * argument (and arguments must be gotten sequentially). 304 */ 305 #define GETARG(type) \ 306 (((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \ 307 nextarg++, va_arg(ap, type)) 308 309 _SET_ORIENTATION(fp, -1); 310 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 311 if (cantwrite(fp)) { 312 errno = EBADF; 313 return (EOF); 314 } 315 316 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 317 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 318 fp->_file >= 0) 319 return (__sbprintf(fp, fmt0, ap)); 320 321 fmt = (char *)fmt0; 322 argtable = NULL; 323 nextarg = 1; 324 va_copy(orgap, ap); 325 uio.uio_iov = iovp = iov; 326 uio.uio_resid = 0; 327 uio.uio_iovcnt = 0; 328 ret = 0; 329 330 memset(&ps, 0, sizeof(ps)); 331 /* 332 * Scan the format for conversions (`%' character). 333 */ 334 for (;;) { 335 cp = fmt; 336 #if 1 /* BIONIC */ 337 n = -1; 338 while ( (wc = *fmt) != 0 ) { 339 if (wc == '%') { 340 n = 1; 341 break; 342 } 343 fmt++; 344 } 345 #else 346 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 347 fmt += n; 348 if (wc == '%') { 349 fmt--; 350 break; 351 } 352 } 353 #endif 354 if ((m = fmt - cp) != 0) { 355 PRINT(cp, m); 356 ret += m; 357 } 358 if (n <= 0) 359 goto done; 360 fmt++; /* skip over '%' */ 361 362 flags = 0; 363 dprec = 0; 364 width = 0; 365 prec = -1; 366 sign = '\0'; 367 368 rflag: ch = *fmt++; 369 reswitch: switch (ch) { 370 case ' ': 371 /* 372 * ``If the space and + flags both appear, the space 373 * flag will be ignored.'' 374 * -- ANSI X3J11 375 */ 376 if (!sign) 377 sign = ' '; 378 goto rflag; 379 case '#': 380 flags |= ALT; 381 goto rflag; 382 case '*': 383 /* 384 * ``A negative field width argument is taken as a 385 * - flag followed by a positive field width.'' 386 * -- ANSI X3J11 387 * They don't exclude field widths read from args. 388 */ 389 GETASTER(width); 390 if (width >= 0) 391 goto rflag; 392 width = -width; 393 /* FALLTHROUGH */ 394 case '-': 395 flags |= LADJUST; 396 goto rflag; 397 case '+': 398 sign = '+'; 399 goto rflag; 400 case '.': 401 if ((ch = *fmt++) == '*') { 402 GETASTER(n); 403 prec = n < 0 ? -1 : n; 404 goto rflag; 405 } 406 n = 0; 407 while (is_digit(ch)) { 408 n = 10 * n + to_digit(ch); 409 ch = *fmt++; 410 } 411 if (ch == '$') { 412 nextarg = n; 413 if (argtable == NULL) { 414 argtable = statargtable; 415 __find_arguments(fmt0, orgap, 416 &argtable, &argtablesiz); 417 } 418 goto rflag; 419 } 420 prec = n < 0 ? -1 : n; 421 goto reswitch; 422 case '0': 423 /* 424 * ``Note that 0 is taken as a flag, not as the 425 * beginning of a field width.'' 426 * -- ANSI X3J11 427 */ 428 flags |= ZEROPAD; 429 goto rflag; 430 case '1': case '2': case '3': case '4': 431 case '5': case '6': case '7': case '8': case '9': 432 n = 0; 433 do { 434 n = 10 * n + to_digit(ch); 435 ch = *fmt++; 436 } while (is_digit(ch)); 437 if (ch == '$') { 438 nextarg = n; 439 if (argtable == NULL) { 440 argtable = statargtable; 441 __find_arguments(fmt0, orgap, 442 &argtable, &argtablesiz); 443 } 444 goto rflag; 445 } 446 width = n; 447 goto reswitch; 448 #ifdef FLOATING_POINT 449 case 'L': 450 flags |= LONGDBL; 451 goto rflag; 452 #endif 453 case 'h': 454 flags |= SHORTINT; 455 goto rflag; 456 case 'j': 457 flags |= MAXINT; 458 goto rflag; 459 case 'l': 460 if (*fmt == 'l') { 461 fmt++; 462 flags |= LLONGINT; 463 } else { 464 flags |= LONGINT; 465 } 466 goto rflag; 467 case 'q': 468 flags |= LLONGINT; 469 goto rflag; 470 case 't': 471 flags |= PTRINT; 472 goto rflag; 473 case 'z': 474 flags |= SIZEINT; 475 goto rflag; 476 case 'c': 477 *(cp = buf) = GETARG(int); 478 size = 1; 479 sign = '\0'; 480 break; 481 case 'D': 482 flags |= LONGINT; 483 /*FALLTHROUGH*/ 484 case 'd': 485 case 'i': 486 _umax = SARG(); 487 if ((intmax_t)_umax < 0) { 488 _umax = -_umax; 489 sign = '-'; 490 } 491 base = DEC; 492 goto number; 493 #ifdef FLOATING_POINT 494 case 'e': 495 case 'E': 496 case 'f': 497 case 'g': 498 case 'G': 499 if (prec == -1) { 500 prec = DEFPREC; 501 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 502 prec = 1; 503 } 504 505 if (flags & LONGDBL) { 506 _double = (double) GETARG(long double); 507 } else { 508 _double = GETARG(double); 509 } 510 511 /* do this before tricky precision changes */ 512 if (_my_isinf(_double)) { 513 if (_double < 0) 514 sign = '-'; 515 cp = "Inf"; 516 size = 3; 517 break; 518 } 519 if (_my_isnan(_double)) { 520 cp = "NaN"; 521 size = 3; 522 break; 523 } 524 525 flags |= FPT; 526 cp = cvt(_double, prec, flags, &softsign, 527 &expt, ch, &ndig); 528 cp_free = cp; 529 if (ch == 'g' || ch == 'G') { 530 if (expt <= -4 || expt > prec) 531 ch = (ch == 'g') ? 'e' : 'E'; 532 else 533 ch = 'g'; 534 } 535 if (ch <= 'e') { /* 'e' or 'E' fmt */ 536 --expt; 537 expsize = exponent(expstr, expt, ch); 538 size = expsize + ndig; 539 if (ndig > 1 || flags & ALT) 540 ++size; 541 } else if (ch == 'f') { /* f fmt */ 542 if (expt > 0) { 543 size = expt; 544 if (prec || flags & ALT) 545 size += prec + 1; 546 } else /* "0.X" */ 547 size = prec + 2; 548 } else if (expt >= ndig) { /* fixed g fmt */ 549 size = expt; 550 if (flags & ALT) 551 ++size; 552 } else 553 size = ndig + (expt > 0 ? 554 1 : 2 - expt); 555 556 if (softsign) 557 sign = '-'; 558 break; 559 #endif /* FLOATING_POINT */ 560 /* the Android security team suggests removing support for %n 561 * since it has no real practical value, and could lead to 562 * running malicious code (for really bugy programs that 563 * send to printf() user-generated formatting strings). 564 */ 565 #if 0 566 case 'n': 567 if (flags & LLONGINT) 568 *GETARG(long long *) = ret; 569 else if (flags & LONGINT) 570 *GETARG(long *) = ret; 571 else if (flags & SHORTINT) 572 *GETARG(short *) = ret; 573 else if (flags & CHARINT) 574 *GETARG(__signed char *) = ret; 575 else if (flags & PTRINT) 576 *GETARG(ptrdiff_t *) = ret; 577 else if (flags & SIZEINT) 578 *GETARG(ssize_t *) = ret; 579 else if (flags & MAXINT) 580 *GETARG(intmax_t *) = ret; 581 else 582 *GETARG(int *) = ret; 583 continue; /* no output */ 584 #endif 585 case 'O': 586 flags |= LONGINT; 587 /*FALLTHROUGH*/ 588 case 'o': 589 _umax = UARG(); 590 base = OCT; 591 goto nosign; 592 case 'p': 593 /* 594 * ``The argument shall be a pointer to void. The 595 * value of the pointer is converted to a sequence 596 * of printable characters, in an implementation- 597 * defined manner.'' 598 * -- ANSI X3J11 599 */ 600 /* NOSTRICT */ 601 _umax = (u_long)GETARG(void *); 602 base = HEX; 603 xdigs = "0123456789abcdef"; 604 flags |= HEXPREFIX; 605 ch = 'x'; 606 goto nosign; 607 case 's': 608 if ((cp = GETARG(char *)) == NULL) 609 cp = "(null)"; 610 if (prec >= 0) { 611 /* 612 * can't use strlen; can only look for the 613 * NUL in the first `prec' characters, and 614 * strlen() will go further. 615 */ 616 char *p = memchr(cp, 0, prec); 617 618 if (p != NULL) { 619 size = p - cp; 620 if (size > prec) 621 size = prec; 622 } else 623 size = prec; 624 } else 625 size = strlen(cp); 626 sign = '\0'; 627 break; 628 case 'U': 629 flags |= LONGINT; 630 /*FALLTHROUGH*/ 631 case 'u': 632 _umax = UARG(); 633 base = DEC; 634 goto nosign; 635 case 'X': 636 xdigs = "0123456789ABCDEF"; 637 goto hex; 638 case 'x': 639 xdigs = "0123456789abcdef"; 640 hex: _umax = UARG(); 641 base = HEX; 642 /* leading 0x/X only if non-zero */ 643 if (flags & ALT && _umax != 0) 644 flags |= HEXPREFIX; 645 646 /* unsigned conversions */ 647 nosign: sign = '\0'; 648 /* 649 * ``... diouXx conversions ... if a precision is 650 * specified, the 0 flag will be ignored.'' 651 * -- ANSI X3J11 652 */ 653 number: if ((dprec = prec) >= 0) 654 flags &= ~ZEROPAD; 655 656 /* 657 * ``The result of converting a zero value with an 658 * explicit precision of zero is no characters.'' 659 * -- ANSI X3J11 660 */ 661 cp = buf + BUF; 662 if (_umax != 0 || prec != 0) { 663 /* 664 * Unsigned mod is hard, and unsigned mod 665 * by a constant is easier than that by 666 * a variable; hence this switch. 667 */ 668 switch (base) { 669 case OCT: 670 do { 671 *--cp = to_char(_umax & 7); 672 _umax >>= 3; 673 } while (_umax); 674 /* handle octal leading 0 */ 675 if (flags & ALT && *cp != '0') 676 *--cp = '0'; 677 break; 678 679 case DEC: 680 /* many numbers are 1 digit */ 681 while (_umax >= 10) { 682 *--cp = to_char(_umax % 10); 683 _umax /= 10; 684 } 685 *--cp = to_char(_umax); 686 break; 687 688 case HEX: 689 do { 690 *--cp = xdigs[_umax & 15]; 691 _umax >>= 4; 692 } while (_umax); 693 break; 694 695 default: 696 cp = "bug in vfprintf: bad base"; 697 size = strlen(cp); 698 goto skipsize; 699 } 700 } 701 size = buf + BUF - cp; 702 skipsize: 703 break; 704 default: /* "%?" prints ?, unless ? is NUL */ 705 if (ch == '\0') 706 goto done; 707 /* pretend it was %c with argument ch */ 708 cp = buf; 709 *cp = ch; 710 size = 1; 711 sign = '\0'; 712 break; 713 } 714 715 /* 716 * All reasonable formats wind up here. At this point, `cp' 717 * points to a string which (if not flags&LADJUST) should be 718 * padded out to `width' places. If flags&ZEROPAD, it should 719 * first be prefixed by any sign or other prefix; otherwise, 720 * it should be blank padded before the prefix is emitted. 721 * After any left-hand padding and prefixing, emit zeroes 722 * required by a decimal [diouxX] precision, then print the 723 * string proper, then emit zeroes required by any leftover 724 * floating precision; finally, if LADJUST, pad with blanks. 725 * 726 * Compute actual size, so we know how much to pad. 727 * size excludes decimal prec; realsz includes it. 728 */ 729 realsz = dprec > size ? dprec : size; 730 if (sign) 731 realsz++; 732 else if (flags & HEXPREFIX) 733 realsz+= 2; 734 735 /* right-adjusting blank padding */ 736 if ((flags & (LADJUST|ZEROPAD)) == 0) 737 PAD(width - realsz, blanks); 738 739 /* prefix */ 740 if (sign) { 741 PRINT(&sign, 1); 742 } else if (flags & HEXPREFIX) { 743 ox[0] = '0'; 744 ox[1] = ch; 745 PRINT(ox, 2); 746 } 747 748 /* right-adjusting zero padding */ 749 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 750 PAD(width - realsz, zeroes); 751 752 /* leading zeroes from decimal precision */ 753 PAD(dprec - size, zeroes); 754 755 /* the string or number proper */ 756 #ifdef FLOATING_POINT 757 if ((flags & FPT) == 0) { 758 PRINT(cp, size); 759 } else { /* glue together f_p fragments */ 760 if (ch >= 'f') { /* 'f' or 'g' */ 761 if (_double == 0) { 762 /* kludge for __dtoa irregularity */ 763 PRINT("0", 1); 764 if (expt < ndig || (flags & ALT) != 0) { 765 PRINT(decimal_point, 1); 766 PAD(ndig - 1, zeroes); 767 } 768 } else if (expt <= 0) { 769 PRINT("0", 1); 770 PRINT(decimal_point, 1); 771 PAD(-expt, zeroes); 772 PRINT(cp, ndig); 773 } else if (expt >= ndig) { 774 PRINT(cp, ndig); 775 PAD(expt - ndig, zeroes); 776 if (flags & ALT) 777 PRINT(".", 1); 778 } else { 779 PRINT(cp, expt); 780 cp += expt; 781 PRINT(".", 1); 782 PRINT(cp, ndig-expt); 783 } 784 } else { /* 'e' or 'E' */ 785 if (ndig > 1 || flags & ALT) { 786 ox[0] = *cp++; 787 ox[1] = '.'; 788 PRINT(ox, 2); 789 if (_double) { 790 PRINT(cp, ndig-1); 791 } else /* 0.[0..] */ 792 /* __dtoa irregularity */ 793 PAD(ndig - 1, zeroes); 794 } else /* XeYYY */ 795 PRINT(cp, 1); 796 PRINT(expstr, expsize); 797 } 798 } 799 #else 800 PRINT(cp, size); 801 #endif 802 /* left-adjusting padding (always blank) */ 803 if (flags & LADJUST) 804 PAD(width - realsz, blanks); 805 806 /* finally, adjust ret */ 807 ret += width > realsz ? width : realsz; 808 809 FLUSH(); /* copy out the I/O vectors */ 810 #if 1 /* BIONIC: remove memory leak when printing doubles */ 811 if (cp_free) { 812 free(cp_free); 813 cp_free = NULL; 814 } 815 #endif 816 } 817 done: 818 FLUSH(); 819 error: 820 #if 1 /* BIONIC: remove memory leak when printing doubles */ 821 if (cp_free) { 822 free(cp_free); 823 cp_free = NULL; 824 } 825 #endif 826 if (argtable != NULL && argtable != statargtable) { 827 munmap(argtable, argtablesiz); 828 argtable = NULL; 829 } 830 return (__sferror(fp) ? EOF : ret); 831 /* NOTREACHED */ 832 } 833 834 /* 835 * Type ids for argument type table. 836 */ 837 #define T_UNUSED 0 838 #define T_SHORT 1 839 #define T_U_SHORT 2 840 #define TP_SHORT 3 841 #define T_INT 4 842 #define T_U_INT 5 843 #define TP_INT 6 844 #define T_LONG 7 845 #define T_U_LONG 8 846 #define TP_LONG 9 847 #define T_LLONG 10 848 #define T_U_LLONG 11 849 #define TP_LLONG 12 850 #define T_DOUBLE 13 851 #define T_LONG_DOUBLE 14 852 #define TP_CHAR 15 853 #define TP_VOID 16 854 #define T_PTRINT 17 855 #define TP_PTRINT 18 856 #define T_SIZEINT 19 857 #define T_SSIZEINT 20 858 #define TP_SSIZEINT 21 859 #define T_MAXINT 22 860 #define T_MAXUINT 23 861 #define TP_MAXINT 24 862 863 /* 864 * Find all arguments when a positional parameter is encountered. Returns a 865 * table, indexed by argument number, of pointers to each arguments. The 866 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 867 * It will be replaced with a mmap-ed one if it overflows (malloc cannot be 868 * used since we are attempting to make snprintf thread safe, and alloca is 869 * problematic since we have nested functions..) 870 */ 871 static void 872 __find_arguments(const char *fmt0, va_list ap, va_list **argtable, 873 size_t *argtablesiz) 874 { 875 char *fmt; /* format string */ 876 int ch; /* character from fmt */ 877 int n, n2; /* handy integer (short term usage) */ 878 char *cp; /* handy char pointer (short term usage) */ 879 int flags; /* flags as above */ 880 unsigned char *typetable; /* table of types */ 881 unsigned char stattypetable[STATIC_ARG_TBL_SIZE]; 882 int tablesize; /* current size of type table */ 883 int tablemax; /* largest used index in table */ 884 int nextarg; /* 1-based argument index */ 885 wchar_t wc; 886 void* ps; 887 888 /* 889 * Add an argument type to the table, expanding if necessary. 890 */ 891 #define ADDTYPE(type) \ 892 ((nextarg >= tablesize) ? \ 893 __grow_type_table(&typetable, &tablesize) : 0, \ 894 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 895 typetable[nextarg++] = type) 896 897 #define ADDSARG() \ 898 ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \ 899 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ 900 ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \ 901 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 902 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \ 903 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT))))))) 904 905 #define ADDUARG() \ 906 ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \ 907 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ 908 ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \ 909 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 910 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \ 911 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT))))))) 912 913 /* 914 * Add * arguments to the type array. 915 */ 916 #define ADDASTER() \ 917 n2 = 0; \ 918 cp = fmt; \ 919 while (is_digit(*cp)) { \ 920 n2 = 10 * n2 + to_digit(*cp); \ 921 cp++; \ 922 } \ 923 if (*cp == '$') { \ 924 int hold = nextarg; \ 925 nextarg = n2; \ 926 ADDTYPE(T_INT); \ 927 nextarg = hold; \ 928 fmt = ++cp; \ 929 } else { \ 930 ADDTYPE(T_INT); \ 931 } 932 fmt = (char *)fmt0; 933 typetable = stattypetable; 934 tablesize = STATIC_ARG_TBL_SIZE; 935 tablemax = 0; 936 nextarg = 1; 937 memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 938 memset(&ps, 0, sizeof(ps)); 939 940 /* 941 * Scan the format for conversions (`%' character). 942 */ 943 for (;;) { 944 cp = fmt; 945 #if 1 /* BIONIC */ 946 n = -1; 947 while ((wc = *fmt) != 0) { 948 if (wc == '%') { 949 n = 1; 950 break; 951 } 952 fmt++; 953 } 954 #else 955 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 956 fmt += n; 957 if (wc == '%') { 958 fmt--; 959 break; 960 } 961 } 962 #endif 963 if (n <= 0) 964 goto done; 965 fmt++; /* skip over '%' */ 966 967 flags = 0; 968 969 rflag: ch = *fmt++; 970 reswitch: switch (ch) { 971 case ' ': 972 case '#': 973 goto rflag; 974 case '*': 975 ADDASTER(); 976 goto rflag; 977 case '-': 978 case '+': 979 goto rflag; 980 case '.': 981 if ((ch = *fmt++) == '*') { 982 ADDASTER(); 983 goto rflag; 984 } 985 while (is_digit(ch)) { 986 ch = *fmt++; 987 } 988 goto reswitch; 989 case '0': 990 goto rflag; 991 case '1': case '2': case '3': case '4': 992 case '5': case '6': case '7': case '8': case '9': 993 n = 0; 994 do { 995 n = 10 * n + to_digit(ch); 996 ch = *fmt++; 997 } while (is_digit(ch)); 998 if (ch == '$') { 999 nextarg = n; 1000 goto rflag; 1001 } 1002 goto reswitch; 1003 #ifdef FLOATING_POINT 1004 case 'L': 1005 flags |= LONGDBL; 1006 goto rflag; 1007 #endif 1008 case 'h': 1009 if (*fmt == 'h') { 1010 fmt++; 1011 flags |= CHARINT; 1012 } else { 1013 flags |= SHORTINT; 1014 } 1015 goto rflag; 1016 case 'l': 1017 if (*fmt == 'l') { 1018 fmt++; 1019 flags |= LLONGINT; 1020 } else { 1021 flags |= LONGINT; 1022 } 1023 goto rflag; 1024 case 'q': 1025 flags |= LLONGINT; 1026 goto rflag; 1027 case 't': 1028 flags |= PTRINT; 1029 goto rflag; 1030 case 'z': 1031 flags |= SIZEINT; 1032 goto rflag; 1033 case 'c': 1034 ADDTYPE(T_INT); 1035 break; 1036 case 'D': 1037 flags |= LONGINT; 1038 /*FALLTHROUGH*/ 1039 case 'd': 1040 case 'i': 1041 ADDSARG(); 1042 break; 1043 #ifdef FLOATING_POINT 1044 case 'e': 1045 case 'E': 1046 case 'f': 1047 case 'g': 1048 case 'G': 1049 if (flags & LONGDBL) 1050 ADDTYPE(T_LONG_DOUBLE); 1051 else 1052 ADDTYPE(T_DOUBLE); 1053 break; 1054 #endif /* FLOATING_POINT */ 1055 case 'n': 1056 if (flags & LLONGINT) 1057 ADDTYPE(TP_LLONG); 1058 else if (flags & LONGINT) 1059 ADDTYPE(TP_LONG); 1060 else if (flags & SHORTINT) 1061 ADDTYPE(TP_SHORT); 1062 else if (flags & PTRINT) 1063 ADDTYPE(TP_PTRINT); 1064 else if (flags & SIZEINT) 1065 ADDTYPE(TP_SSIZEINT); 1066 else if (flags & MAXINT) 1067 ADDTYPE(TP_MAXINT); 1068 else 1069 ADDTYPE(TP_INT); 1070 continue; /* no output */ 1071 case 'O': 1072 flags |= LONGINT; 1073 /*FALLTHROUGH*/ 1074 case 'o': 1075 ADDUARG(); 1076 break; 1077 case 'p': 1078 ADDTYPE(TP_VOID); 1079 break; 1080 case 's': 1081 ADDTYPE(TP_CHAR); 1082 break; 1083 case 'U': 1084 flags |= LONGINT; 1085 /*FALLTHROUGH*/ 1086 case 'u': 1087 case 'X': 1088 case 'x': 1089 ADDUARG(); 1090 break; 1091 default: /* "%?" prints ?, unless ? is NUL */ 1092 if (ch == '\0') 1093 goto done; 1094 break; 1095 } 1096 } 1097 done: 1098 /* 1099 * Build the argument table. 1100 */ 1101 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1102 *argtablesiz = sizeof (va_list) * (tablemax + 1); 1103 *argtable = (va_list *)mmap(NULL, *argtablesiz, 1104 PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); 1105 } 1106 1107 #if 0 1108 /* XXX is this required? */ 1109 (*argtable) [0] = NULL; 1110 #endif 1111 for (n = 1; n <= tablemax; n++) { 1112 va_copy((*argtable)[n], ap); 1113 switch (typetable[n]) { 1114 case T_UNUSED: 1115 (void) va_arg(ap, int); 1116 break; 1117 case T_SHORT: 1118 (void) va_arg(ap, int); 1119 break; 1120 case T_U_SHORT: 1121 (void) va_arg(ap, int); 1122 break; 1123 case TP_SHORT: 1124 (void) va_arg(ap, short *); 1125 break; 1126 case T_INT: 1127 (void) va_arg(ap, int); 1128 break; 1129 case T_U_INT: 1130 (void) va_arg(ap, unsigned int); 1131 break; 1132 case TP_INT: 1133 (void) va_arg(ap, int *); 1134 break; 1135 case T_LONG: 1136 (void) va_arg(ap, long); 1137 break; 1138 case T_U_LONG: 1139 (void) va_arg(ap, unsigned long); 1140 break; 1141 case TP_LONG: 1142 (void) va_arg(ap, long *); 1143 break; 1144 case T_LLONG: 1145 (void) va_arg(ap, long long); 1146 break; 1147 case T_U_LLONG: 1148 (void) va_arg(ap, unsigned long long); 1149 break; 1150 case TP_LLONG: 1151 (void) va_arg(ap, long long *); 1152 break; 1153 case T_DOUBLE: 1154 (void) va_arg(ap, double); 1155 break; 1156 case T_LONG_DOUBLE: 1157 (void) va_arg(ap, long double); 1158 break; 1159 case TP_CHAR: 1160 (void) va_arg(ap, char *); 1161 break; 1162 case TP_VOID: 1163 (void) va_arg(ap, void *); 1164 break; 1165 case T_PTRINT: 1166 (void) va_arg(ap, ptrdiff_t); 1167 break; 1168 case TP_PTRINT: 1169 (void) va_arg(ap, ptrdiff_t *); 1170 break; 1171 case T_SIZEINT: 1172 (void) va_arg(ap, size_t); 1173 break; 1174 case T_SSIZEINT: 1175 (void) va_arg(ap, ssize_t); 1176 break; 1177 case TP_SSIZEINT: 1178 (void) va_arg(ap, ssize_t *); 1179 break; 1180 case TP_MAXINT: 1181 (void) va_arg(ap, intmax_t *); 1182 break; 1183 } 1184 } 1185 1186 if (typetable != NULL && typetable != stattypetable) { 1187 munmap(typetable, *argtablesiz); 1188 typetable = NULL; 1189 } 1190 } 1191 1192 /* 1193 * Increase the size of the type table. 1194 */ 1195 static int 1196 __grow_type_table(unsigned char **typetable, int *tablesize) 1197 { 1198 unsigned char *oldtable = *typetable; 1199 int newsize = *tablesize * 2; 1200 1201 if (*tablesize == STATIC_ARG_TBL_SIZE) { 1202 *typetable = (unsigned char *)mmap(NULL, 1203 sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ, 1204 MAP_ANON|MAP_PRIVATE, -1, 0); 1205 /* XXX unchecked */ 1206 memcpy( *typetable, oldtable, *tablesize); 1207 } else { 1208 unsigned char *new = (unsigned char *)mmap(NULL, 1209 sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ, 1210 MAP_ANON|MAP_PRIVATE, -1, 0); 1211 memmove(new, *typetable, *tablesize); 1212 munmap(*typetable, *tablesize); 1213 *typetable = new; 1214 /* XXX unchecked */ 1215 } 1216 memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize)); 1217 1218 *tablesize = newsize; 1219 return(0); 1220 } 1221 1222 1223 #ifdef FLOATING_POINT 1224 1225 extern char *__dtoa(double, int, int, int *, int *, char **); 1226 1227 static char * 1228 cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, 1229 int *length) 1230 { 1231 int mode, dsgn; 1232 char *digits, *bp, *rve; 1233 1234 if (ch == 'f') { 1235 mode = 3; /* ndigits after the decimal point */ 1236 } else { 1237 /* To obtain ndigits after the decimal point for the 'e' 1238 * and 'E' formats, round to ndigits + 1 significant 1239 * figures. 1240 */ 1241 if (ch == 'e' || ch == 'E') { 1242 ndigits++; 1243 } 1244 mode = 2; /* ndigits significant digits */ 1245 } 1246 1247 if (value < 0) { 1248 value = -value; 1249 *sign = '-'; 1250 } else 1251 *sign = '\000'; 1252 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 1253 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 1254 bp = digits + ndigits; 1255 if (ch == 'f') { 1256 if (*digits == '0' && value) 1257 *decpt = -ndigits + 1; 1258 bp += *decpt; 1259 } 1260 if (value == 0) /* kludge for __dtoa irregularity */ 1261 rve = bp; 1262 while (rve < bp) 1263 *rve++ = '0'; 1264 } 1265 *length = rve - digits; 1266 return (digits); 1267 } 1268 1269 static int 1270 exponent(char *p0, int exp, int fmtch) 1271 { 1272 char *p, *t; 1273 char expbuf[MAXEXP]; 1274 1275 p = p0; 1276 *p++ = fmtch; 1277 if (exp < 0) { 1278 exp = -exp; 1279 *p++ = '-'; 1280 } 1281 else 1282 *p++ = '+'; 1283 t = expbuf + MAXEXP; 1284 if (exp > 9) { 1285 do { 1286 *--t = to_char(exp % 10); 1287 } while ((exp /= 10) > 9); 1288 *--t = to_char(exp); 1289 for (; t < expbuf + MAXEXP; *p++ = *t++); 1290 } 1291 else { 1292 *p++ = '0'; 1293 *p++ = to_char(exp); 1294 } 1295 return (p - p0); 1296 } 1297 1298 1299 /* BIONIC */ 1300 #include <machine/ieee.h> 1301 typedef union { 1302 double d; 1303 struct ieee_double i; 1304 } ieee_u; 1305 1306 static int 1307 _my_isinf (double value) 1308 { 1309 ieee_u u; 1310 1311 u.d = value; 1312 return (u.i.dbl_exp == 2047 && u.i.dbl_frach == 0 && u.i.dbl_fracl == 0); 1313 } 1314 1315 static int 1316 _my_isnan (double value) 1317 { 1318 ieee_u u; 1319 1320 u.d = value; 1321 return (u.i.dbl_exp == 2047 && (u.i.dbl_frach != 0 || u.i.dbl_fracl != 0)); 1322 } 1323 #endif /* FLOATING_POINT */ 1324
