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