1 /* $OpenBSD: vfprintf.c,v 1.41 2007/01/16 19:20:53 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 <limits.h> 45 #include <stdarg.h> 46 #include <stddef.h> 47 #include <stdio.h> 48 #include <stdint.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #include "local.h" 53 #include "fvwrite.h" 54 55 static int __find_arguments(const char *fmt0, va_list ap, va_list **argtable, 56 size_t *argtablesiz); 57 static int __grow_type_table(unsigned char **typetable, int *tablesize); 58 59 /* 60 * Flush out all the vectors defined by the given uio, 61 * then reset it so that it can be reused. 62 */ 63 static int 64 __sprint(FILE *fp, struct __suio *uio) 65 { 66 int err; 67 68 if (uio->uio_resid == 0) { 69 uio->uio_iovcnt = 0; 70 return (0); 71 } 72 err = __sfvwrite(fp, uio); 73 uio->uio_resid = 0; 74 uio->uio_iovcnt = 0; 75 return (err); 76 } 77 78 /* 79 * Helper function for `fprintf to unbuffered unix file': creates a 80 * temporary buffer. We only work on write-only files; this avoids 81 * worries about ungetc buffers and so forth. 82 */ 83 static int 84 __sbprintf(FILE *fp, const char *fmt, va_list ap) 85 { 86 int ret; 87 FILE fake; 88 struct __sfileext fakeext; 89 unsigned char buf[BUFSIZ]; 90 91 _FILEEXT_SETUP(&fake, &fakeext); 92 /* copy the important variables */ 93 fake._flags = fp->_flags & ~__SNBF; 94 fake._file = fp->_file; 95 fake._cookie = fp->_cookie; 96 fake._write = fp->_write; 97 98 /* set up the buffer */ 99 fake._bf._base = fake._p = buf; 100 fake._bf._size = fake._w = sizeof(buf); 101 fake._lbfsize = 0; /* not actually used, but Just In Case */ 102 103 /* do the work, then copy any error status */ 104 ret = vfprintf(&fake, fmt, ap); 105 if (ret >= 0 && fflush(&fake)) 106 ret = EOF; 107 if (fake._flags & __SERR) 108 fp->_flags |= __SERR; 109 return (ret); 110 } 111 112 113 #ifdef FLOATING_POINT 114 #include <locale.h> 115 #include <math.h> 116 #include "floatio.h" 117 118 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 119 #define DEFPREC 6 120 121 extern char *__dtoa(double, int, int, int *, int *, char **); 122 extern void __freedtoa(char *); 123 static char *cvt(double, int, int, char *, int *, int, int *); 124 static int exponent(char *, int, int); 125 126 #else /* no FLOATING_POINT */ 127 #define BUF 40 128 #endif /* FLOATING_POINT */ 129 130 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 131 132 133 /* 134 * Macros for converting digits to letters and vice versa 135 */ 136 #define to_digit(c) ((c) - '0') 137 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 138 #define to_char(n) ((n) + '0') 139 140 /* 141 * Flags used during conversion. 142 */ 143 #define ALT 0x0001 /* alternate form */ 144 #define HEXPREFIX 0x0002 /* add 0x or 0X prefix */ 145 #define LADJUST 0x0004 /* left adjustment */ 146 #define LONGDBL 0x0008 /* long double; unimplemented */ 147 #define LONGINT 0x0010 /* long integer */ 148 #define LLONGINT 0x0020 /* long long integer */ 149 #define SHORTINT 0x0040 /* short integer */ 150 #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */ 151 #define FPT 0x0100 /* Floating point number */ 152 #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */ 153 #define SIZEINT 0x0400 /* (signed) size_t */ 154 #define CHARINT 0x0800 /* 8 bit integer */ 155 #define MAXINT 0x1000 /* largest integer size (intmax_t) */ 156 157 int 158 vfprintf(FILE *fp, const char *fmt0, __va_list ap) 159 { 160 char *fmt; /* format string */ 161 int ch; /* character from fmt */ 162 int n, n2; /* handy integers (short term usage) */ 163 char *cp; /* handy char pointer (short term usage) */ 164 struct __siov *iovp; /* for PRINT macro */ 165 int flags; /* flags as above */ 166 int ret; /* return value accumulator */ 167 int width; /* width from format (%8d), or 0 */ 168 int prec; /* precision from format (%.3d), or -1 */ 169 char sign; /* sign prefix (' ', '+', '-', or \0) */ 170 wchar_t wc; 171 mbstate_t ps; 172 #ifdef FLOATING_POINT 173 char *decimal_point = localeconv()->decimal_point; 174 char softsign; /* temporary negative sign for floats */ 175 double _double; /* double precision arguments %[eEfgG] */ 176 int expt; /* integer value of exponent */ 177 int expsize; /* character count for expstr */ 178 int ndig; /* actual number of digits returned by cvt */ 179 char expstr[7]; /* buffer for exponent string */ 180 char *dtoaresult = NULL; 181 #endif 182 183 uintmax_t _umax; /* integer arguments %[diouxX] */ 184 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 185 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 186 int realsz; /* field size expanded by dprec */ 187 int size; /* size of converted field or string */ 188 char *xdigs; /* digits for [xX] conversion */ 189 #define NIOV 8 190 struct __suio uio; /* output information: summary */ 191 struct __siov iov[NIOV];/* ... and individual io vectors */ 192 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 193 char ox[2]; /* space for 0x hex-prefix */ 194 va_list *argtable; /* args, built due to positional arg */ 195 va_list statargtable[STATIC_ARG_TBL_SIZE]; 196 size_t argtablesiz; 197 int nextarg; /* 1-based argument index */ 198 va_list orgap; /* original argument pointer */ 199 200 /* 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 * Append a digit to a value and check for overflow. 266 */ 267 #define APPEND_DIGIT(val, dig) do { \ 268 if ((val) > INT_MAX / 10) \ 269 goto overflow; \ 270 (val) *= 10; \ 271 if ((val) > INT_MAX - to_digit((dig))) \ 272 goto overflow; \ 273 (val) += to_digit((dig)); \ 274 } while (0) 275 276 /* 277 * Get * arguments, including the form *nn$. Preserve the nextarg 278 * that the argument can be gotten once the type is determined. 279 */ 280 #define GETASTER(val) \ 281 n2 = 0; \ 282 cp = fmt; \ 283 while (is_digit(*cp)) { \ 284 APPEND_DIGIT(n2, *cp); \ 285 cp++; \ 286 } \ 287 if (*cp == '$') { \ 288 int hold = nextarg; \ 289 if (argtable == NULL) { \ 290 argtable = statargtable; \ 291 __find_arguments(fmt0, orgap, &argtable, &argtablesiz); \ 292 } \ 293 nextarg = n2; \ 294 val = GETARG(int); \ 295 nextarg = hold; \ 296 fmt = ++cp; \ 297 } else { \ 298 val = GETARG(int); \ 299 } 300 301 /* 302 * Get the argument indexed by nextarg. If the argument table is 303 * built, use it to get the argument. If its not, get the next 304 * argument (and arguments must be gotten sequentially). 305 */ 306 #define GETARG(type) \ 307 (((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \ 308 nextarg++, va_arg(ap, type)) 309 310 _SET_ORIENTATION(fp, -1); 311 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 312 if (cantwrite(fp)) { 313 errno = EBADF; 314 return (EOF); 315 } 316 317 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 318 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 319 fp->_file >= 0) 320 return (__sbprintf(fp, fmt0, ap)); 321 322 fmt = (char *)fmt0; 323 argtable = NULL; 324 nextarg = 1; 325 va_copy(orgap, ap); 326 uio.uio_iov = iovp = iov; 327 uio.uio_resid = 0; 328 uio.uio_iovcnt = 0; 329 ret = 0; 330 331 memset(&ps, 0, sizeof(ps)); 332 /* 333 * Scan the format for conversions (`%' character). 334 */ 335 for (;;) { 336 cp = fmt; 337 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 338 fmt += n; 339 if (wc == '%') { 340 fmt--; 341 break; 342 } 343 } 344 if (fmt != cp) { 345 ptrdiff_t m = fmt - cp; 346 if (m < 0 || m > INT_MAX - ret) 347 goto overflow; 348 PRINT(cp, m); 349 ret += m; 350 } 351 if (n <= 0) 352 goto done; 353 fmt++; /* skip over '%' */ 354 355 flags = 0; 356 dprec = 0; 357 width = 0; 358 prec = -1; 359 sign = '\0'; 360 361 rflag: ch = *fmt++; 362 reswitch: switch (ch) { 363 case ' ': 364 /* 365 * ``If the space and + flags both appear, the space 366 * flag will be ignored.'' 367 * -- ANSI X3J11 368 */ 369 if (!sign) 370 sign = ' '; 371 goto rflag; 372 case '#': 373 flags |= ALT; 374 goto rflag; 375 case '*': 376 /* 377 * ``A negative field width argument is taken as a 378 * - flag followed by a positive field width.'' 379 * -- ANSI X3J11 380 * They don't exclude field widths read from args. 381 */ 382 GETASTER(width); 383 if (width >= 0) 384 goto rflag; 385 if (width == INT_MIN) 386 goto overflow; 387 width = -width; 388 /* FALLTHROUGH */ 389 case '-': 390 flags |= LADJUST; 391 goto rflag; 392 case '+': 393 sign = '+'; 394 goto rflag; 395 case '.': 396 if ((ch = *fmt++) == '*') { 397 GETASTER(n); 398 prec = n < 0 ? -1 : n; 399 goto rflag; 400 } 401 n = 0; 402 while (is_digit(ch)) { 403 APPEND_DIGIT(n, ch); 404 ch = *fmt++; 405 } 406 if (ch == '$') { 407 nextarg = n; 408 if (argtable == NULL) { 409 argtable = statargtable; 410 __find_arguments(fmt0, orgap, 411 &argtable, &argtablesiz); 412 } 413 goto rflag; 414 } 415 prec = n; 416 goto reswitch; 417 case '0': 418 /* 419 * ``Note that 0 is taken as a flag, not as the 420 * beginning of a field width.'' 421 * -- ANSI X3J11 422 */ 423 flags |= ZEROPAD; 424 goto rflag; 425 case '1': case '2': case '3': case '4': 426 case '5': case '6': case '7': case '8': case '9': 427 n = 0; 428 do { 429 APPEND_DIGIT(n, ch); 430 ch = *fmt++; 431 } while (is_digit(ch)); 432 if (ch == '$') { 433 nextarg = n; 434 if (argtable == NULL) { 435 argtable = statargtable; 436 __find_arguments(fmt0, orgap, 437 &argtable, &argtablesiz); 438 } 439 goto rflag; 440 } 441 width = n; 442 goto reswitch; 443 #ifdef FLOATING_POINT 444 case 'L': 445 flags |= LONGDBL; 446 goto rflag; 447 #endif 448 case 'h': 449 flags |= SHORTINT; 450 goto rflag; 451 case 'j': 452 flags |= MAXINT; 453 goto rflag; 454 case 'l': 455 if (*fmt == 'l') { 456 fmt++; 457 flags |= LLONGINT; 458 } else { 459 flags |= LONGINT; 460 } 461 goto rflag; 462 case 'q': 463 flags |= LLONGINT; 464 goto rflag; 465 case 't': 466 flags |= PTRINT; 467 goto rflag; 468 case 'z': 469 flags |= SIZEINT; 470 goto rflag; 471 case 'c': 472 *(cp = buf) = GETARG(int); 473 size = 1; 474 sign = '\0'; 475 break; 476 case 'D': 477 flags |= LONGINT; 478 /*FALLTHROUGH*/ 479 case 'd': 480 case 'i': 481 _umax = SARG(); 482 if ((intmax_t)_umax < 0) { 483 _umax = -_umax; 484 sign = '-'; 485 } 486 base = DEC; 487 goto number; 488 #ifdef FLOATING_POINT 489 case 'e': 490 case 'E': 491 case 'f': 492 case 'g': 493 case 'G': 494 if (prec == -1) { 495 prec = DEFPREC; 496 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 497 prec = 1; 498 } 499 500 if (flags & LONGDBL) { 501 _double = (double) GETARG(long double); 502 } else { 503 _double = GETARG(double); 504 } 505 506 /* do this before tricky precision changes */ 507 if (isinf(_double)) { 508 if (_double < 0) 509 sign = '-'; 510 cp = "Inf"; 511 size = 3; 512 break; 513 } 514 if (isnan(_double)) { 515 cp = "NaN"; 516 size = 3; 517 break; 518 } 519 520 flags |= FPT; 521 if (dtoaresult) 522 __freedtoa(dtoaresult); 523 dtoaresult = cp = cvt(_double, prec, flags, &softsign, 524 &expt, ch, &ndig); 525 if (ch == 'g' || ch == 'G') { 526 if (expt <= -4 || expt > prec) 527 ch = (ch == 'g') ? 'e' : 'E'; 528 else 529 ch = 'g'; 530 } 531 if (ch <= 'e') { /* 'e' or 'E' fmt */ 532 --expt; 533 expsize = exponent(expstr, expt, ch); 534 size = expsize + ndig; 535 if (ndig > 1 || flags & ALT) 536 ++size; 537 } else if (ch == 'f') { /* f fmt */ 538 if (expt > 0) { 539 size = expt; 540 if (prec || flags & ALT) 541 size += prec + 1; 542 } else { /* "0.X" */ 543 size = prec + 2; 544 } 545 } else if (expt >= ndig) { /* fixed g fmt */ 546 size = expt; 547 if (flags & ALT) 548 ++size; 549 } else { 550 size = ndig + (expt > 0 ? 1 : 2 - expt); 551 } 552 553 if (softsign) 554 sign = '-'; 555 break; 556 #endif /* FLOATING_POINT */ 557 case 'n': 558 if (flags & LLONGINT) 559 *GETARG(long long *) = ret; 560 else if (flags & LONGINT) 561 *GETARG(long *) = ret; 562 else if (flags & SHORTINT) 563 *GETARG(short *) = ret; 564 else if (flags & CHARINT) 565 *GETARG(__signed char *) = ret; 566 else if (flags & PTRINT) 567 *GETARG(ptrdiff_t *) = ret; 568 else if (flags & SIZEINT) 569 *GETARG(ssize_t *) = ret; 570 else if (flags & MAXINT) 571 *GETARG(intmax_t *) = ret; 572 else 573 *GETARG(int *) = ret; 574 continue; /* no output */ 575 case 'O': 576 flags |= LONGINT; 577 /*FALLTHROUGH*/ 578 case 'o': 579 _umax = UARG(); 580 base = OCT; 581 goto nosign; 582 case 'p': 583 /* 584 * ``The argument shall be a pointer to void. The 585 * value of the pointer is converted to a sequence 586 * of printable characters, in an implementation- 587 * defined manner.'' 588 * -- ANSI X3J11 589 */ 590 /* NOSTRICT */ 591 _umax = (u_long)GETARG(void *); 592 base = HEX; 593 xdigs = "0123456789abcdef"; 594 flags |= HEXPREFIX; 595 ch = 'x'; 596 goto nosign; 597 case 's': 598 if ((cp = GETARG(char *)) == NULL) 599 cp = "(null)"; 600 if (prec >= 0) { 601 /* 602 * can't use strlen; can only look for the 603 * NUL in the first `prec' characters, and 604 * strlen() will go further. 605 */ 606 char *p = memchr(cp, 0, prec); 607 608 if (p != NULL) { 609 size = p - cp; 610 if (size > prec) 611 size = prec; 612 } else { 613 size = prec; 614 } 615 } else { 616 size = strlen(cp); 617 } 618 sign = '\0'; 619 break; 620 case 'U': 621 flags |= LONGINT; 622 /*FALLTHROUGH*/ 623 case 'u': 624 _umax = UARG(); 625 base = DEC; 626 goto nosign; 627 case 'X': 628 xdigs = "0123456789ABCDEF"; 629 goto hex; 630 case 'x': 631 xdigs = "0123456789abcdef"; 632 hex: _umax = UARG(); 633 base = HEX; 634 /* leading 0x/X only if non-zero */ 635 if (flags & ALT && _umax != 0) 636 flags |= HEXPREFIX; 637 638 /* unsigned conversions */ 639 nosign: sign = '\0'; 640 /* 641 * ``... diouXx conversions ... if a precision is 642 * specified, the 0 flag will be ignored.'' 643 * -- ANSI X3J11 644 */ 645 number: if ((dprec = prec) >= 0) 646 flags &= ~ZEROPAD; 647 648 /* 649 * ``The result of converting a zero value with an 650 * explicit precision of zero is no characters.'' 651 * -- ANSI X3J11 652 */ 653 cp = buf + BUF; 654 if (_umax != 0 || prec != 0) { 655 /* 656 * Unsigned mod is hard, and unsigned mod 657 * by a constant is easier than that by 658 * a variable; hence this switch. 659 */ 660 switch (base) { 661 case OCT: 662 do { 663 *--cp = to_char(_umax & 7); 664 _umax >>= 3; 665 } while (_umax); 666 /* handle octal leading 0 */ 667 if (flags & ALT && *cp != '0') 668 *--cp = '0'; 669 break; 670 671 case DEC: 672 /* many numbers are 1 digit */ 673 while (_umax >= 10) { 674 *--cp = to_char(_umax % 10); 675 _umax /= 10; 676 } 677 *--cp = to_char(_umax); 678 break; 679 680 case HEX: 681 do { 682 *--cp = xdigs[_umax & 15]; 683 _umax >>= 4; 684 } while (_umax); 685 break; 686 687 default: 688 cp = "bug in vfprintf: bad base"; 689 size = strlen(cp); 690 goto skipsize; 691 } 692 } 693 size = buf + BUF - cp; 694 skipsize: 695 break; 696 default: /* "%?" prints ?, unless ? is NUL */ 697 if (ch == '\0') 698 goto done; 699 /* pretend it was %c with argument ch */ 700 cp = buf; 701 *cp = ch; 702 size = 1; 703 sign = '\0'; 704 break; 705 } 706 707 /* 708 * All reasonable formats wind up here. At this point, `cp' 709 * points to a string which (if not flags&LADJUST) should be 710 * padded out to `width' places. If flags&ZEROPAD, it should 711 * first be prefixed by any sign or other prefix; otherwise, 712 * it should be blank padded before the prefix is emitted. 713 * After any left-hand padding and prefixing, emit zeroes 714 * required by a decimal [diouxX] precision, then print the 715 * string proper, then emit zeroes required by any leftover 716 * floating precision; finally, if LADJUST, pad with blanks. 717 * 718 * Compute actual size, so we know how much to pad. 719 * size excludes decimal prec; realsz includes it. 720 */ 721 realsz = dprec > size ? dprec : size; 722 if (sign) 723 realsz++; 724 else if (flags & HEXPREFIX) 725 realsz+= 2; 726 727 /* right-adjusting blank padding */ 728 if ((flags & (LADJUST|ZEROPAD)) == 0) 729 PAD(width - realsz, blanks); 730 731 /* prefix */ 732 if (sign) { 733 PRINT(&sign, 1); 734 } else if (flags & HEXPREFIX) { 735 ox[0] = '0'; 736 ox[1] = ch; 737 PRINT(ox, 2); 738 } 739 740 /* right-adjusting zero padding */ 741 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 742 PAD(width - realsz, zeroes); 743 744 /* leading zeroes from decimal precision */ 745 PAD(dprec - size, zeroes); 746 747 /* the string or number proper */ 748 #ifdef FLOATING_POINT 749 if ((flags & FPT) == 0) { 750 PRINT(cp, size); 751 } else { /* glue together f_p fragments */ 752 if (ch >= 'f') { /* 'f' or 'g' */ 753 if (_double == 0) { 754 /* kludge for __dtoa irregularity */ 755 PRINT("0", 1); 756 if (expt < ndig || (flags & ALT) != 0) { 757 PRINT(decimal_point, 1); 758 PAD(ndig - 1, zeroes); 759 } 760 } else if (expt <= 0) { 761 PRINT("0", 1); 762 PRINT(decimal_point, 1); 763 PAD(-expt, zeroes); 764 PRINT(cp, ndig); 765 } else if (expt >= ndig) { 766 PRINT(cp, ndig); 767 PAD(expt - ndig, zeroes); 768 if (flags & ALT) 769 PRINT(".", 1); 770 } else { 771 PRINT(cp, expt); 772 cp += expt; 773 PRINT(".", 1); 774 PRINT(cp, ndig-expt); 775 } 776 } else { /* 'e' or 'E' */ 777 if (ndig > 1 || flags & ALT) { 778 ox[0] = *cp++; 779 ox[1] = '.'; 780 PRINT(ox, 2); 781 if (_double) { 782 PRINT(cp, ndig-1); 783 } else {/* 0.[0..] */ 784 /* __dtoa irregularity */ 785 PAD(ndig - 1, zeroes); 786 } 787 } else { /* XeYYY */ 788 PRINT(cp, 1); 789 } 790 PRINT(expstr, expsize); 791 } 792 } 793 #else 794 PRINT(cp, size); 795 #endif 796 /* left-adjusting padding (always blank) */ 797 if (flags & LADJUST) 798 PAD(width - realsz, blanks); 799 800 /* finally, adjust ret */ 801 if (width < realsz) 802 width = realsz; 803 if (width > INT_MAX - ret) 804 goto overflow; 805 ret += width; 806 807 FLUSH(); /* copy out the I/O vectors */ 808 } 809 done: 810 FLUSH(); 811 error: 812 if (__sferror(fp)) 813 ret = -1; 814 goto finish; 815 816 overflow: 817 errno = ENOMEM; 818 ret = -1; 819 820 finish: 821 #ifdef FLOATING_POINT 822 if (dtoaresult) 823 __freedtoa(dtoaresult); 824 #endif 825 if (argtable != NULL && argtable != statargtable) { 826 munmap(argtable, argtablesiz); 827 argtable = NULL; 828 } 829 return (ret); 830 } 831 832 /* 833 * Type ids for argument type table. 834 */ 835 #define T_UNUSED 0 836 #define T_SHORT 1 837 #define T_U_SHORT 2 838 #define TP_SHORT 3 839 #define T_INT 4 840 #define T_U_INT 5 841 #define TP_INT 6 842 #define T_LONG 7 843 #define T_U_LONG 8 844 #define TP_LONG 9 845 #define T_LLONG 10 846 #define T_U_LLONG 11 847 #define TP_LLONG 12 848 #define T_DOUBLE 13 849 #define T_LONG_DOUBLE 14 850 #define TP_CHAR 15 851 #define TP_VOID 16 852 #define T_PTRINT 17 853 #define TP_PTRINT 18 854 #define T_SIZEINT 19 855 #define T_SSIZEINT 20 856 #define TP_SSIZEINT 21 857 #define T_MAXINT 22 858 #define T_MAXUINT 23 859 #define TP_MAXINT 24 860 861 /* 862 * Find all arguments when a positional parameter is encountered. Returns a 863 * table, indexed by argument number, of pointers to each arguments. The 864 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 865 * It will be replaced with a mmap-ed one if it overflows (malloc cannot be 866 * used since we are attempting to make snprintf thread safe, and alloca is 867 * problematic since we have nested functions..) 868 */ 869 static int 870 __find_arguments(const char *fmt0, va_list ap, va_list **argtable, 871 size_t *argtablesiz) 872 { 873 char *fmt; /* format string */ 874 int ch; /* character from fmt */ 875 int n, n2; /* handy integer (short term usage) */ 876 char *cp; /* handy char pointer (short term usage) */ 877 int flags; /* flags as above */ 878 unsigned char *typetable; /* table of types */ 879 unsigned char stattypetable[STATIC_ARG_TBL_SIZE]; 880 int tablesize; /* current size of type table */ 881 int tablemax; /* largest used index in table */ 882 int nextarg; /* 1-based argument index */ 883 int ret = 0; /* return value */ 884 wchar_t wc; 885 mbstate_t ps; 886 887 /* 888 * Add an argument type to the table, expanding if necessary. 889 */ 890 #define ADDTYPE(type) \ 891 ((nextarg >= tablesize) ? \ 892 __grow_type_table(&typetable, &tablesize) : 0, \ 893 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 894 typetable[nextarg++] = type) 895 896 #define ADDSARG() \ 897 ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \ 898 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ 899 ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \ 900 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 901 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \ 902 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT))))))) 903 904 #define ADDUARG() \ 905 ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \ 906 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ 907 ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \ 908 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 909 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \ 910 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT))))))) 911 912 /* 913 * Add * arguments to the type array. 914 */ 915 #define ADDASTER() \ 916 n2 = 0; \ 917 cp = fmt; \ 918 while (is_digit(*cp)) { \ 919 APPEND_DIGIT(n2, *cp); \ 920 cp++; \ 921 } \ 922 if (*cp == '$') { \ 923 int hold = nextarg; \ 924 nextarg = n2; \ 925 ADDTYPE(T_INT); \ 926 nextarg = hold; \ 927 fmt = ++cp; \ 928 } else { \ 929 ADDTYPE(T_INT); \ 930 } 931 fmt = (char *)fmt0; 932 typetable = stattypetable; 933 tablesize = STATIC_ARG_TBL_SIZE; 934 tablemax = 0; 935 nextarg = 1; 936 memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 937 memset(&ps, 0, sizeof(ps)); 938 939 /* 940 * Scan the format for conversions (`%' character). 941 */ 942 for (;;) { 943 cp = fmt; 944 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 945 fmt += n; 946 if (wc == '%') { 947 fmt--; 948 break; 949 } 950 } 951 if (n <= 0) 952 goto done; 953 fmt++; /* skip over '%' */ 954 955 flags = 0; 956 957 rflag: ch = *fmt++; 958 reswitch: switch (ch) { 959 case ' ': 960 case '#': 961 goto rflag; 962 case '*': 963 ADDASTER(); 964 goto rflag; 965 case '-': 966 case '+': 967 goto rflag; 968 case '.': 969 if ((ch = *fmt++) == '*') { 970 ADDASTER(); 971 goto rflag; 972 } 973 while (is_digit(ch)) { 974 ch = *fmt++; 975 } 976 goto reswitch; 977 case '0': 978 goto rflag; 979 case '1': case '2': case '3': case '4': 980 case '5': case '6': case '7': case '8': case '9': 981 n = 0; 982 do { 983 APPEND_DIGIT(n ,ch); 984 ch = *fmt++; 985 } while (is_digit(ch)); 986 if (ch == '$') { 987 nextarg = n; 988 goto rflag; 989 } 990 goto reswitch; 991 #ifdef FLOATING_POINT 992 case 'L': 993 flags |= LONGDBL; 994 goto rflag; 995 #endif 996 case 'h': 997 if (*fmt == 'h') { 998 fmt++; 999 flags |= CHARINT; 1000 } else { 1001 flags |= SHORTINT; 1002 } 1003 goto rflag; 1004 case 'l': 1005 if (*fmt == 'l') { 1006 fmt++; 1007 flags |= LLONGINT; 1008 } else { 1009 flags |= LONGINT; 1010 } 1011 goto rflag; 1012 case 'q': 1013 flags |= LLONGINT; 1014 goto rflag; 1015 case 't': 1016 flags |= PTRINT; 1017 goto rflag; 1018 case 'z': 1019 flags |= SIZEINT; 1020 goto rflag; 1021 case 'c': 1022 ADDTYPE(T_INT); 1023 break; 1024 case 'D': 1025 flags |= LONGINT; 1026 /*FALLTHROUGH*/ 1027 case 'd': 1028 case 'i': 1029 ADDSARG(); 1030 break; 1031 #ifdef FLOATING_POINT 1032 case 'e': 1033 case 'E': 1034 case 'f': 1035 case 'g': 1036 case 'G': 1037 if (flags & LONGDBL) 1038 ADDTYPE(T_LONG_DOUBLE); 1039 else 1040 ADDTYPE(T_DOUBLE); 1041 break; 1042 #endif /* FLOATING_POINT */ 1043 case 'n': 1044 if (flags & LLONGINT) 1045 ADDTYPE(TP_LLONG); 1046 else if (flags & LONGINT) 1047 ADDTYPE(TP_LONG); 1048 else if (flags & SHORTINT) 1049 ADDTYPE(TP_SHORT); 1050 else if (flags & PTRINT) 1051 ADDTYPE(TP_PTRINT); 1052 else if (flags & SIZEINT) 1053 ADDTYPE(TP_SSIZEINT); 1054 else if (flags & MAXINT) 1055 ADDTYPE(TP_MAXINT); 1056 else 1057 ADDTYPE(TP_INT); 1058 continue; /* no output */ 1059 case 'O': 1060 flags |= LONGINT; 1061 /*FALLTHROUGH*/ 1062 case 'o': 1063 ADDUARG(); 1064 break; 1065 case 'p': 1066 ADDTYPE(TP_VOID); 1067 break; 1068 case 's': 1069 ADDTYPE(TP_CHAR); 1070 break; 1071 case 'U': 1072 flags |= LONGINT; 1073 /*FALLTHROUGH*/ 1074 case 'u': 1075 case 'X': 1076 case 'x': 1077 ADDUARG(); 1078 break; 1079 default: /* "%?" prints ?, unless ? is NUL */ 1080 if (ch == '\0') 1081 goto done; 1082 break; 1083 } 1084 } 1085 done: 1086 /* 1087 * Build the argument table. 1088 */ 1089 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1090 *argtablesiz = sizeof (va_list) * (tablemax + 1); 1091 *argtable = mmap(NULL, *argtablesiz, 1092 PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); 1093 if (*argtable == MAP_FAILED) 1094 return (-1); 1095 } 1096 1097 #if 0 1098 /* XXX is this required? */ 1099 (*argtable) [0] = NULL; 1100 #endif 1101 for (n = 1; n <= tablemax; n++) { 1102 va_copy((*argtable)[n], ap); 1103 switch (typetable[n]) { 1104 case T_UNUSED: 1105 (void) va_arg(ap, int); 1106 break; 1107 case T_SHORT: 1108 (void) va_arg(ap, int); 1109 break; 1110 case T_U_SHORT: 1111 (void) va_arg(ap, int); 1112 break; 1113 case TP_SHORT: 1114 (void) va_arg(ap, short *); 1115 break; 1116 case T_INT: 1117 (void) va_arg(ap, int); 1118 break; 1119 case T_U_INT: 1120 (void) va_arg(ap, unsigned int); 1121 break; 1122 case TP_INT: 1123 (void) va_arg(ap, int *); 1124 break; 1125 case T_LONG: 1126 (void) va_arg(ap, long); 1127 break; 1128 case T_U_LONG: 1129 (void) va_arg(ap, unsigned long); 1130 break; 1131 case TP_LONG: 1132 (void) va_arg(ap, long *); 1133 break; 1134 case T_LLONG: 1135 (void) va_arg(ap, long long); 1136 break; 1137 case T_U_LLONG: 1138 (void) va_arg(ap, unsigned long long); 1139 break; 1140 case TP_LLONG: 1141 (void) va_arg(ap, long long *); 1142 break; 1143 case T_DOUBLE: 1144 (void) va_arg(ap, double); 1145 break; 1146 case T_LONG_DOUBLE: 1147 (void) va_arg(ap, long double); 1148 break; 1149 case TP_CHAR: 1150 (void) va_arg(ap, char *); 1151 break; 1152 case TP_VOID: 1153 (void) va_arg(ap, void *); 1154 break; 1155 case T_PTRINT: 1156 (void) va_arg(ap, ptrdiff_t); 1157 break; 1158 case TP_PTRINT: 1159 (void) va_arg(ap, ptrdiff_t *); 1160 break; 1161 case T_SIZEINT: 1162 (void) va_arg(ap, size_t); 1163 break; 1164 case T_SSIZEINT: 1165 (void) va_arg(ap, ssize_t); 1166 break; 1167 case TP_SSIZEINT: 1168 (void) va_arg(ap, ssize_t *); 1169 break; 1170 case TP_MAXINT: 1171 (void) va_arg(ap, intmax_t *); 1172 break; 1173 } 1174 } 1175 goto finish; 1176 1177 overflow: 1178 errno = ENOMEM; 1179 ret = -1; 1180 1181 finish: 1182 if (typetable != NULL && typetable != stattypetable) { 1183 munmap(typetable, *argtablesiz); 1184 typetable = NULL; 1185 } 1186 return (ret); 1187 } 1188 1189 /* 1190 * Increase the size of the type table. 1191 */ 1192 static int 1193 __grow_type_table(unsigned char **typetable, int *tablesize) 1194 { 1195 unsigned char *oldtable = *typetable; 1196 int newsize = *tablesize * 2; 1197 1198 if (newsize < getpagesize()) 1199 newsize = getpagesize(); 1200 1201 if (*tablesize == STATIC_ARG_TBL_SIZE) { 1202 *typetable = mmap(NULL, newsize, PROT_WRITE|PROT_READ, 1203 MAP_ANON|MAP_PRIVATE, -1, 0); 1204 if (*typetable == MAP_FAILED) 1205 return (-1); 1206 bcopy(oldtable, *typetable, *tablesize); 1207 } else { 1208 unsigned char *new = mmap(NULL, newsize, PROT_WRITE|PROT_READ, 1209 MAP_ANON|MAP_PRIVATE, -1, 0); 1210 if (new == MAP_FAILED) 1211 return (-1); 1212 memmove(new, *typetable, *tablesize); 1213 munmap(*typetable, *tablesize); 1214 *typetable = new; 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 static char * 1226 cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, 1227 int *length) 1228 { 1229 int mode, dsgn; 1230 char *digits, *bp, *rve; 1231 1232 if (ch == 'f') { 1233 mode = 3; /* ndigits after the decimal point */ 1234 } else { 1235 /* To obtain ndigits after the decimal point for the 'e' 1236 * and 'E' formats, round to ndigits + 1 significant 1237 * figures. 1238 */ 1239 if (ch == 'e' || ch == 'E') { 1240 ndigits++; 1241 } 1242 mode = 2; /* ndigits significant digits */ 1243 } 1244 1245 if (value < 0) { 1246 value = -value; 1247 *sign = '-'; 1248 } else 1249 *sign = '\000'; 1250 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 1251 if ((ch != 'g' && ch != 'G') || flags & ALT) {/* Print trailing zeros */ 1252 bp = digits + ndigits; 1253 if (ch == 'f') { 1254 if (*digits == '0' && value) 1255 *decpt = -ndigits + 1; 1256 bp += *decpt; 1257 } 1258 if (value == 0) /* kludge for __dtoa irregularity */ 1259 rve = bp; 1260 while (rve < bp) 1261 *rve++ = '0'; 1262 } 1263 *length = rve - digits; 1264 return (digits); 1265 } 1266 1267 static int 1268 exponent(char *p0, int exp, int fmtch) 1269 { 1270 char *p, *t; 1271 char expbuf[MAXEXP]; 1272 1273 p = p0; 1274 *p++ = fmtch; 1275 if (exp < 0) { 1276 exp = -exp; 1277 *p++ = '-'; 1278 } else 1279 *p++ = '+'; 1280 t = expbuf + MAXEXP; 1281 if (exp > 9) { 1282 do { 1283 *--t = to_char(exp % 10); 1284 } while ((exp /= 10) > 9); 1285 *--t = to_char(exp); 1286 for (; t < expbuf + MAXEXP; *p++ = *t++) 1287 /* nothing */; 1288 } else { 1289 *p++ = '0'; 1290 *p++ = to_char(exp); 1291 } 1292 return (p - p0); 1293 } 1294 #endif /* FLOATING_POINT */ 1295