1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *rcsid = "$OpenBSD: vfprintf.c,v 1.20 2003/06/02 20:18:37 millert Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 /* 38 * Actual printf innards. 39 * 40 * This code is large and complicated... 41 */ 42 43 #include <sys/types.h> 44 #include <sys/mman.h> 45 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <errno.h> 50 #include <stdarg.h> 51 52 #include "local.h" 53 #include "fvwrite.h" 54 55 static void __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(fp, uio) 65 FILE *fp; 66 register struct __suio *uio; 67 { 68 register int err; 69 70 if (uio->uio_resid == 0) { 71 uio->uio_iovcnt = 0; 72 return (0); 73 } 74 err = __sfvwrite(fp, uio); 75 uio->uio_resid = 0; 76 uio->uio_iovcnt = 0; 77 return (err); 78 } 79 80 /* 81 * Helper function for `fprintf to unbuffered unix file': creates a 82 * temporary buffer. We only work on write-only files; this avoids 83 * worries about ungetc buffers and so forth. 84 */ 85 static int 86 __sbprintf(fp, fmt, ap) 87 register FILE *fp; 88 const char *fmt; 89 va_list ap; 90 { 91 int ret; 92 FILE fake; 93 unsigned char buf[BUFSIZ]; 94 95 /* copy the important variables */ 96 fake._flags = fp->_flags & ~__SNBF; 97 fake._file = fp->_file; 98 fake._cookie = fp->_cookie; 99 fake._write = fp->_write; 100 101 /* set up the buffer */ 102 fake._bf._base = fake._p = buf; 103 fake._bf._size = fake._w = sizeof(buf); 104 fake._lbfsize = 0; /* not actually used, but Just In Case */ 105 106 /* do the work, then copy any error status */ 107 ret = vfprintf(&fake, fmt, ap); 108 if (ret >= 0 && fflush(&fake)) 109 ret = EOF; 110 if (fake._flags & __SERR) 111 fp->_flags |= __SERR; 112 return (ret); 113 } 114 115 116 #ifdef FLOATING_POINT 117 #include <locale.h> 118 #include <math.h> 119 #include "floatio.h" 120 121 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 122 #define DEFPREC 6 123 124 static char *cvt(double, int, int, char *, int *, int, int *); 125 static int exponent(char *, int, int); 126 127 #else /* no FLOATING_POINT */ 128 #define BUF 40 129 #endif /* FLOATING_POINT */ 130 131 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 132 133 134 /* 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 0x001 /* alternate form */ 145 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 146 #define LADJUST 0x004 /* left adjustment */ 147 #define LONGDBL 0x008 /* long double; unimplemented */ 148 #define LONGINT 0x010 /* long integer */ 149 #define QUADINT 0x020 /* quad integer */ 150 #define SHORTINT 0x040 /* short integer */ 151 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 152 #define FPT 0x100 /* Floating point number */ 153 int 154 vfprintf(fp, fmt0, ap) 155 FILE *fp; 156 const char *fmt0; 157 _BSD_VA_LIST_ ap; 158 { 159 register char *fmt; /* format string */ 160 register int ch; /* character from fmt */ 161 register int n, m, n2; /* handy integers (short term usage) */ 162 register char *cp; /* handy char pointer (short term usage) */ 163 register struct __siov *iovp;/* for PRINT macro */ 164 register int flags; /* flags as above */ 165 int ret; /* return value accumulator */ 166 int width; /* width from format (%8d), or 0 */ 167 int prec; /* precision from format (%.3d), or -1 */ 168 char sign; /* sign prefix (' ', '+', '-', or \0) */ 169 wchar_t wc; 170 #ifdef FLOATING_POINT 171 char *decimal_point = localeconv()->decimal_point; 172 char softsign; /* temporary negative sign for floats */ 173 double _double; /* double precision arguments %[eEfgG] */ 174 int expt; /* integer value of exponent */ 175 int expsize; /* character count for expstr */ 176 int ndig; /* actual number of digits returned by cvt */ 177 char expstr[7]; /* buffer for exponent string */ 178 #endif 179 180 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 181 #define quad_t long long 182 #define u_quad_t unsigned long long 183 #endif 184 185 u_quad_t _uquad; /* integer arguments %[diouxX] */ 186 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 187 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 188 int realsz; /* field size expanded by dprec */ 189 int size; /* size of converted field or string */ 190 char *xdigs; /* digits for [xX] conversion */ 191 #define NIOV 8 192 struct __suio uio; /* output information: summary */ 193 struct __siov iov[NIOV];/* ... and individual io vectors */ 194 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 195 char ox[2]; /* space for 0x hex-prefix */ 196 va_list *argtable; /* args, built due to positional arg */ 197 va_list statargtable[STATIC_ARG_TBL_SIZE]; 198 size_t argtablesiz; 199 int nextarg; /* 1-based argument index */ 200 va_list orgap; /* original argument pointer */ 201 202 /* 203 * Choose PADSIZE to trade efficiency vs. size. If larger printf 204 * fields occur frequently, increase PADSIZE and make the initialisers 205 * below longer. 206 */ 207 #define PADSIZE 16 /* pad chunk size */ 208 static char blanks[PADSIZE] = 209 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 210 static char zeroes[PADSIZE] = 211 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 212 213 /* 214 * BEWARE, these `goto error' on error, and PAD uses `n'. 215 */ 216 #define PRINT(ptr, len) do { \ 217 iovp->iov_base = (ptr); \ 218 iovp->iov_len = (len); \ 219 uio.uio_resid += (len); \ 220 iovp++; \ 221 if (++uio.uio_iovcnt >= NIOV) { \ 222 if (__sprint(fp, &uio)) \ 223 goto error; \ 224 iovp = iov; \ 225 } \ 226 } while (0) 227 #define PAD(howmany, with) do { \ 228 if ((n = (howmany)) > 0) { \ 229 while (n > PADSIZE) { \ 230 PRINT(with, PADSIZE); \ 231 n -= PADSIZE; \ 232 } \ 233 PRINT(with, n); \ 234 } \ 235 } while (0) 236 #define FLUSH() do { \ 237 if (uio.uio_resid && __sprint(fp, &uio)) \ 238 goto error; \ 239 uio.uio_iovcnt = 0; \ 240 iovp = iov; \ 241 } while (0) 242 243 /* 244 * To extend shorts properly, we need both signed and unsigned 245 * argument extraction methods. 246 */ 247 #define SARG() \ 248 (flags&QUADINT ? va_arg(ap, quad_t) : \ 249 flags&LONGINT ? GETARG(long) : \ 250 flags&SHORTINT ? (long)(short)GETARG(int) : \ 251 (long)GETARG(int)) 252 #define UARG() \ 253 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 254 flags&LONGINT ? GETARG(u_long) : \ 255 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 256 (u_long)GETARG(u_int)) 257 258 /* 259 * Get * arguments, including the form *nn$. Preserve the nextarg 260 * that the argument can be gotten once the type is determined. 261 */ 262 #define GETASTER(val) \ 263 n2 = 0; \ 264 cp = fmt; \ 265 while (is_digit(*cp)) { \ 266 n2 = 10 * n2 + to_digit(*cp); \ 267 cp++; \ 268 } \ 269 if (*cp == '$') { \ 270 int hold = nextarg; \ 271 if (argtable == NULL) { \ 272 argtable = statargtable; \ 273 __find_arguments(fmt0, orgap, &argtable, &argtablesiz); \ 274 } \ 275 nextarg = n2; \ 276 val = GETARG(int); \ 277 nextarg = hold; \ 278 fmt = ++cp; \ 279 } else { \ 280 val = GETARG(int); \ 281 } 282 283 /* 284 * Get the argument indexed by nextarg. If the argument table is 285 * built, use it to get the argument. If its not, get the next 286 * argument (and arguments must be gotten sequentially). 287 */ 288 #define GETARG(type) \ 289 (((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \ 290 nextarg++, va_arg(ap, type)) 291 292 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 293 if (cantwrite(fp)) { 294 errno = EBADF; 295 return (EOF); 296 } 297 298 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 299 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 300 fp->_file >= 0) 301 return (__sbprintf(fp, fmt0, ap)); 302 303 fmt = (char *)fmt0; 304 argtable = NULL; 305 nextarg = 1; 306 va_copy(orgap, ap); 307 uio.uio_iov = iovp = iov; 308 uio.uio_resid = 0; 309 uio.uio_iovcnt = 0; 310 ret = 0; 311 312 /* 313 * Scan the format for conversions (`%' character). 314 */ 315 for (;;) { 316 cp = fmt; 317 while ((n = mbtowc(&wc, fmt, MB_CUR_MAX)) > 0) { 318 fmt += n; 319 if (wc == '%') { 320 fmt--; 321 break; 322 } 323 } 324 if ((m = fmt - cp) != 0) { 325 PRINT(cp, m); 326 ret += m; 327 } 328 if (n <= 0) 329 goto done; 330 fmt++; /* skip over '%' */ 331 332 flags = 0; 333 dprec = 0; 334 width = 0; 335 prec = -1; 336 sign = '\0'; 337 338 rflag: ch = *fmt++; 339 reswitch: switch (ch) { 340 case ' ': 341 /* 342 * ``If the space and + flags both appear, the space 343 * flag will be ignored.'' 344 * -- ANSI X3J11 345 */ 346 if (!sign) 347 sign = ' '; 348 goto rflag; 349 case '#': 350 flags |= ALT; 351 goto rflag; 352 case '*': 353 /* 354 * ``A negative field width argument is taken as a 355 * - flag followed by a positive field width.'' 356 * -- ANSI X3J11 357 * They don't exclude field widths read from args. 358 */ 359 GETASTER(width); 360 if (width >= 0) 361 goto rflag; 362 width = -width; 363 /* FALLTHROUGH */ 364 case '-': 365 flags |= LADJUST; 366 goto rflag; 367 case '+': 368 sign = '+'; 369 goto rflag; 370 case '.': 371 if ((ch = *fmt++) == '*') { 372 GETASTER(n); 373 prec = n < 0 ? -1 : n; 374 goto rflag; 375 } 376 n = 0; 377 while (is_digit(ch)) { 378 n = 10 * n + to_digit(ch); 379 ch = *fmt++; 380 } 381 if (ch == '$') { 382 nextarg = n; 383 if (argtable == NULL) { 384 argtable = statargtable; 385 __find_arguments(fmt0, orgap, 386 &argtable, &argtablesiz); 387 } 388 goto rflag; 389 } 390 prec = n < 0 ? -1 : n; 391 goto reswitch; 392 case '0': 393 /* 394 * ``Note that 0 is taken as a flag, not as the 395 * beginning of a field width.'' 396 * -- ANSI X3J11 397 */ 398 flags |= ZEROPAD; 399 goto rflag; 400 case '1': case '2': case '3': case '4': 401 case '5': case '6': case '7': case '8': case '9': 402 n = 0; 403 do { 404 n = 10 * n + to_digit(ch); 405 ch = *fmt++; 406 } while (is_digit(ch)); 407 if (ch == '$') { 408 nextarg = n; 409 if (argtable == NULL) { 410 argtable = statargtable; 411 __find_arguments(fmt0, orgap, 412 &argtable, &argtablesiz); 413 } 414 goto rflag; 415 } 416 width = n; 417 goto reswitch; 418 #ifdef FLOATING_POINT 419 case 'L': 420 flags |= LONGDBL; 421 goto rflag; 422 #endif 423 case 'h': 424 flags |= SHORTINT; 425 goto rflag; 426 case 'l': 427 if (*fmt == 'l') { 428 fmt++; 429 flags |= QUADINT; 430 } else { 431 flags |= LONGINT; 432 } 433 goto rflag; 434 case 'q': 435 flags |= QUADINT; 436 goto rflag; 437 case 'c': 438 *(cp = buf) = GETARG(int); 439 size = 1; 440 sign = '\0'; 441 break; 442 case 'D': 443 flags |= LONGINT; 444 /*FALLTHROUGH*/ 445 case 'd': 446 case 'i': 447 _uquad = SARG(); 448 if ((quad_t)_uquad < 0) { 449 _uquad = -_uquad; 450 sign = '-'; 451 } 452 base = DEC; 453 goto number; 454 #ifdef FLOATING_POINT 455 case 'e': 456 case 'E': 457 case 'f': 458 case 'g': 459 case 'G': 460 if (prec == -1) { 461 prec = DEFPREC; 462 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 463 prec = 1; 464 } 465 466 if (flags & LONGDBL) { 467 _double = (double) GETARG(long double); 468 } else { 469 _double = GETARG(double); 470 } 471 472 /* do this before tricky precision changes */ 473 if (isinf(_double)) { 474 if (_double < 0) 475 sign = '-'; 476 cp = "Inf"; 477 size = 3; 478 break; 479 } 480 if (isnan(_double)) { 481 cp = "NaN"; 482 size = 3; 483 break; 484 } 485 486 flags |= FPT; 487 cp = cvt(_double, prec, flags, &softsign, 488 &expt, ch, &ndig); 489 if (ch == 'g' || ch == 'G') { 490 if (expt <= -4 || expt > prec) 491 ch = (ch == 'g') ? 'e' : 'E'; 492 else 493 ch = 'g'; 494 } 495 if (ch <= 'e') { /* 'e' or 'E' fmt */ 496 --expt; 497 expsize = exponent(expstr, expt, ch); 498 size = expsize + ndig; 499 if (ndig > 1 || flags & ALT) 500 ++size; 501 } else if (ch == 'f') { /* f fmt */ 502 if (expt > 0) { 503 size = expt; 504 if (prec || flags & ALT) 505 size += prec + 1; 506 } else /* "0.X" */ 507 size = prec + 2; 508 } else if (expt >= ndig) { /* fixed g fmt */ 509 size = expt; 510 if (flags & ALT) 511 ++size; 512 } else 513 size = ndig + (expt > 0 ? 514 1 : 2 - expt); 515 516 if (softsign) 517 sign = '-'; 518 break; 519 #endif /* FLOATING_POINT */ 520 case 'n': 521 if (flags & QUADINT) 522 *GETARG(quad_t *) = ret; 523 else if (flags & LONGINT) 524 *GETARG(long *) = ret; 525 else if (flags & SHORTINT) 526 *GETARG(short *) = ret; 527 else 528 *GETARG(int *) = ret; 529 continue; /* no output */ 530 case 'O': 531 flags |= LONGINT; 532 /*FALLTHROUGH*/ 533 case 'o': 534 _uquad = UARG(); 535 base = OCT; 536 goto nosign; 537 case 'p': 538 /* 539 * ``The argument shall be a pointer to void. The 540 * value of the pointer is converted to a sequence 541 * of printable characters, in an implementation- 542 * defined manner.'' 543 * -- ANSI X3J11 544 */ 545 /* NOSTRICT */ 546 _uquad = (u_long)GETARG(void *); 547 base = HEX; 548 xdigs = "0123456789abcdef"; 549 flags |= HEXPREFIX; 550 ch = 'x'; 551 goto nosign; 552 case 's': 553 if ((cp = GETARG(char *)) == NULL) 554 cp = "(null)"; 555 if (prec >= 0) { 556 /* 557 * can't use strlen; can only look for the 558 * NUL in the first `prec' characters, and 559 * strlen() will go further. 560 */ 561 char *p = memchr(cp, 0, prec); 562 563 if (p != NULL) { 564 size = p - cp; 565 if (size > prec) 566 size = prec; 567 } else 568 size = prec; 569 } else 570 size = strlen(cp); 571 sign = '\0'; 572 break; 573 case 'U': 574 flags |= LONGINT; 575 /*FALLTHROUGH*/ 576 case 'u': 577 _uquad = UARG(); 578 base = DEC; 579 goto nosign; 580 case 'X': 581 xdigs = "0123456789ABCDEF"; 582 goto hex; 583 case 'x': 584 xdigs = "0123456789abcdef"; 585 hex: _uquad = UARG(); 586 base = HEX; 587 /* leading 0x/X only if non-zero */ 588 if (flags & ALT && _uquad != 0) 589 flags |= HEXPREFIX; 590 591 /* unsigned conversions */ 592 nosign: sign = '\0'; 593 /* 594 * ``... diouXx conversions ... if a precision is 595 * specified, the 0 flag will be ignored.'' 596 * -- ANSI X3J11 597 */ 598 number: if ((dprec = prec) >= 0) 599 flags &= ~ZEROPAD; 600 601 /* 602 * ``The result of converting a zero value with an 603 * explicit precision of zero is no characters.'' 604 * -- ANSI X3J11 605 */ 606 cp = buf + BUF; 607 if (_uquad != 0 || prec != 0) { 608 /* 609 * Unsigned mod is hard, and unsigned mod 610 * by a constant is easier than that by 611 * a variable; hence this switch. 612 */ 613 switch (base) { 614 case OCT: 615 do { 616 *--cp = to_char(_uquad & 7); 617 _uquad >>= 3; 618 } while (_uquad); 619 /* handle octal leading 0 */ 620 if (flags & ALT && *cp != '0') 621 *--cp = '0'; 622 break; 623 624 case DEC: 625 /* many numbers are 1 digit */ 626 while (_uquad >= 10) { 627 *--cp = to_char(_uquad % 10); 628 _uquad /= 10; 629 } 630 *--cp = to_char(_uquad); 631 break; 632 633 case HEX: 634 do { 635 *--cp = xdigs[_uquad & 15]; 636 _uquad >>= 4; 637 } while (_uquad); 638 break; 639 640 default: 641 cp = "bug in vfprintf: bad base"; 642 size = strlen(cp); 643 goto skipsize; 644 } 645 } 646 size = buf + BUF - cp; 647 skipsize: 648 break; 649 default: /* "%?" prints ?, unless ? is NUL */ 650 if (ch == '\0') 651 goto done; 652 /* pretend it was %c with argument ch */ 653 cp = buf; 654 *cp = ch; 655 size = 1; 656 sign = '\0'; 657 break; 658 } 659 660 /* 661 * All reasonable formats wind up here. At this point, `cp' 662 * points to a string which (if not flags&LADJUST) should be 663 * padded out to `width' places. If flags&ZEROPAD, it should 664 * first be prefixed by any sign or other prefix; otherwise, 665 * it should be blank padded before the prefix is emitted. 666 * After any left-hand padding and prefixing, emit zeroes 667 * required by a decimal [diouxX] precision, then print the 668 * string proper, then emit zeroes required by any leftover 669 * floating precision; finally, if LADJUST, pad with blanks. 670 * 671 * Compute actual size, so we know how much to pad. 672 * size excludes decimal prec; realsz includes it. 673 */ 674 realsz = dprec > size ? dprec : size; 675 if (sign) 676 realsz++; 677 else if (flags & HEXPREFIX) 678 realsz+= 2; 679 680 /* right-adjusting blank padding */ 681 if ((flags & (LADJUST|ZEROPAD)) == 0) 682 PAD(width - realsz, blanks); 683 684 /* prefix */ 685 if (sign) { 686 PRINT(&sign, 1); 687 } else if (flags & HEXPREFIX) { 688 ox[0] = '0'; 689 ox[1] = ch; 690 PRINT(ox, 2); 691 } 692 693 /* right-adjusting zero padding */ 694 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 695 PAD(width - realsz, zeroes); 696 697 /* leading zeroes from decimal precision */ 698 PAD(dprec - size, zeroes); 699 700 /* the string or number proper */ 701 #ifdef FLOATING_POINT 702 if ((flags & FPT) == 0) { 703 PRINT(cp, size); 704 } else { /* glue together f_p fragments */ 705 if (ch >= 'f') { /* 'f' or 'g' */ 706 if (_double == 0) { 707 /* kludge for __dtoa irregularity */ 708 PRINT("0", 1); 709 if (expt < ndig || (flags & ALT) != 0) { 710 PRINT(decimal_point, 1); 711 PAD(ndig - 1, zeroes); 712 } 713 } else if (expt <= 0) { 714 PRINT("0", 1); 715 PRINT(decimal_point, 1); 716 PAD(-expt, zeroes); 717 PRINT(cp, ndig); 718 } else if (expt >= ndig) { 719 PRINT(cp, ndig); 720 PAD(expt - ndig, zeroes); 721 if (flags & ALT) 722 PRINT(".", 1); 723 } else { 724 PRINT(cp, expt); 725 cp += expt; 726 PRINT(".", 1); 727 PRINT(cp, ndig-expt); 728 } 729 } else { /* 'e' or 'E' */ 730 if (ndig > 1 || flags & ALT) { 731 ox[0] = *cp++; 732 ox[1] = '.'; 733 PRINT(ox, 2); 734 if (_double) { 735 PRINT(cp, ndig-1); 736 } else /* 0.[0..] */ 737 /* __dtoa irregularity */ 738 PAD(ndig - 1, zeroes); 739 } else /* XeYYY */ 740 PRINT(cp, 1); 741 PRINT(expstr, expsize); 742 } 743 } 744 #else 745 PRINT(cp, size); 746 #endif 747 /* left-adjusting padding (always blank) */ 748 if (flags & LADJUST) 749 PAD(width - realsz, blanks); 750 751 /* finally, adjust ret */ 752 ret += width > realsz ? width : realsz; 753 754 FLUSH(); /* copy out the I/O vectors */ 755 } 756 done: 757 FLUSH(); 758 error: 759 if (argtable != NULL && argtable != statargtable) { 760 munmap(argtable, argtablesiz); 761 argtable = NULL; 762 } 763 return (__sferror(fp) ? EOF : ret); 764 /* NOTREACHED */ 765 } 766 767 /* 768 * Type ids for argument type table. 769 */ 770 #define T_UNUSED 0 771 #define T_SHORT 1 772 #define T_U_SHORT 2 773 #define TP_SHORT 3 774 #define T_INT 4 775 #define T_U_INT 5 776 #define TP_INT 6 777 #define T_LONG 7 778 #define T_U_LONG 8 779 #define TP_LONG 9 780 #define T_QUAD 10 781 #define T_U_QUAD 11 782 #define TP_QUAD 12 783 #define T_DOUBLE 13 784 #define T_LONG_DOUBLE 14 785 #define TP_CHAR 15 786 #define TP_VOID 16 787 788 /* 789 * Find all arguments when a positional parameter is encountered. Returns a 790 * table, indexed by argument number, of pointers to each arguments. The 791 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 792 * It will be replaces with a malloc-ed on if it overflows. 793 */ 794 static void 795 __find_arguments(fmt0, ap, argtable, argtablesiz) 796 const char *fmt0; 797 va_list ap; 798 va_list **argtable; 799 size_t *argtablesiz; 800 { 801 register char *fmt; /* format string */ 802 register int ch; /* character from fmt */ 803 register int n, n2; /* handy integer (short term usage) */ 804 register char *cp; /* handy char pointer (short term usage) */ 805 register int flags; /* flags as above */ 806 unsigned char *typetable; /* table of types */ 807 unsigned char stattypetable[STATIC_ARG_TBL_SIZE]; 808 int tablesize; /* current size of type table */ 809 int tablemax; /* largest used index in table */ 810 int nextarg; /* 1-based argument index */ 811 812 /* 813 * Add an argument type to the table, expanding if necessary. 814 */ 815 #define ADDTYPE(type) \ 816 ((nextarg >= tablesize) ? \ 817 __grow_type_table(&typetable, &tablesize) : 0, \ 818 typetable[nextarg++] = type, \ 819 (nextarg > tablemax) ? tablemax = nextarg : 0) 820 821 #define ADDSARG() \ 822 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \ 823 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT))) 824 825 #define ADDUARG() \ 826 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \ 827 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT))) 828 829 /* 830 * Add * arguments to the type array. 831 */ 832 #define ADDASTER() \ 833 n2 = 0; \ 834 cp = fmt; \ 835 while (is_digit(*cp)) { \ 836 n2 = 10 * n2 + to_digit(*cp); \ 837 cp++; \ 838 } \ 839 if (*cp == '$') { \ 840 int hold = nextarg; \ 841 nextarg = n2; \ 842 ADDTYPE(T_INT); \ 843 nextarg = hold; \ 844 fmt = ++cp; \ 845 } else { \ 846 ADDTYPE(T_INT); \ 847 } 848 fmt = (char *)fmt0; 849 typetable = stattypetable; 850 tablesize = STATIC_ARG_TBL_SIZE; 851 tablemax = 0; 852 nextarg = 1; 853 memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 854 855 /* 856 * Scan the format for conversions (`%' character). 857 */ 858 for (;;) { 859 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 860 /* void */; 861 if (ch == '\0') 862 goto done; 863 fmt++; /* skip over '%' */ 864 865 flags = 0; 866 867 rflag: ch = *fmt++; 868 reswitch: switch (ch) { 869 case ' ': 870 case '#': 871 goto rflag; 872 case '*': 873 ADDASTER(); 874 goto rflag; 875 case '-': 876 case '+': 877 goto rflag; 878 case '.': 879 if ((ch = *fmt++) == '*') { 880 ADDASTER(); 881 goto rflag; 882 } 883 while (is_digit(ch)) { 884 ch = *fmt++; 885 } 886 goto reswitch; 887 case '0': 888 goto rflag; 889 case '1': case '2': case '3': case '4': 890 case '5': case '6': case '7': case '8': case '9': 891 n = 0; 892 do { 893 n = 10 * n + to_digit(ch); 894 ch = *fmt++; 895 } while (is_digit(ch)); 896 if (ch == '$') { 897 nextarg = n; 898 goto rflag; 899 } 900 goto reswitch; 901 #ifdef FLOATING_POINT 902 case 'L': 903 flags |= LONGDBL; 904 goto rflag; 905 #endif 906 case 'h': 907 flags |= SHORTINT; 908 goto rflag; 909 case 'l': 910 flags |= LONGINT; 911 goto rflag; 912 case 'q': 913 flags |= QUADINT; 914 goto rflag; 915 case 'c': 916 ADDTYPE(T_INT); 917 break; 918 case 'D': 919 flags |= LONGINT; 920 /*FALLTHROUGH*/ 921 case 'd': 922 case 'i': 923 if (flags & QUADINT) { 924 ADDTYPE(T_QUAD); 925 } else { 926 ADDSARG(); 927 } 928 break; 929 #ifdef FLOATING_POINT 930 case 'e': 931 case 'E': 932 case 'f': 933 case 'g': 934 case 'G': 935 if (flags & LONGDBL) 936 ADDTYPE(T_LONG_DOUBLE); 937 else 938 ADDTYPE(T_DOUBLE); 939 break; 940 #endif /* FLOATING_POINT */ 941 case 'n': 942 if (flags & QUADINT) 943 ADDTYPE(TP_QUAD); 944 else if (flags & LONGINT) 945 ADDTYPE(TP_LONG); 946 else if (flags & SHORTINT) 947 ADDTYPE(TP_SHORT); 948 else 949 ADDTYPE(TP_INT); 950 continue; /* no output */ 951 case 'O': 952 flags |= LONGINT; 953 /*FALLTHROUGH*/ 954 case 'o': 955 if (flags & QUADINT) 956 ADDTYPE(T_U_QUAD); 957 else 958 ADDUARG(); 959 break; 960 case 'p': 961 ADDTYPE(TP_VOID); 962 break; 963 case 's': 964 ADDTYPE(TP_CHAR); 965 break; 966 case 'U': 967 flags |= LONGINT; 968 /*FALLTHROUGH*/ 969 case 'u': 970 if (flags & QUADINT) 971 ADDTYPE(T_U_QUAD); 972 else 973 ADDUARG(); 974 break; 975 case 'X': 976 case 'x': 977 if (flags & QUADINT) 978 ADDTYPE(T_U_QUAD); 979 else 980 ADDUARG(); 981 break; 982 default: /* "%?" prints ?, unless ? is NUL */ 983 if (ch == '\0') 984 goto done; 985 break; 986 } 987 } 988 done: 989 /* 990 * Build the argument table. 991 */ 992 if (tablemax >= STATIC_ARG_TBL_SIZE) { 993 *argtablesiz = sizeof (va_list) * (tablemax + 1); 994 *argtable = (va_list *)mmap(NULL, *argtablesiz, 995 PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); 996 } 997 998 #if 0 999 /* XXX is this required? */ 1000 (*argtable) [0] = NULL; 1001 #endif 1002 for (n = 1; n <= tablemax; n++) { 1003 va_copy((*argtable)[n], ap); 1004 switch (typetable[n]) { 1005 case T_UNUSED: 1006 (void) va_arg(ap, int); 1007 break; 1008 case T_SHORT: 1009 (void) va_arg(ap, int); 1010 break; 1011 case T_U_SHORT: 1012 (void) va_arg(ap, int); 1013 break; 1014 case TP_SHORT: 1015 (void) va_arg(ap, short *); 1016 break; 1017 case T_INT: 1018 (void) va_arg(ap, int); 1019 break; 1020 case T_U_INT: 1021 (void) va_arg(ap, unsigned int); 1022 break; 1023 case TP_INT: 1024 (void) va_arg(ap, int *); 1025 break; 1026 case T_LONG: 1027 (void) va_arg(ap, long); 1028 break; 1029 case T_U_LONG: 1030 (void) va_arg(ap, unsigned long); 1031 break; 1032 case TP_LONG: 1033 (void) va_arg(ap, long *); 1034 break; 1035 case T_QUAD: 1036 (void) va_arg(ap, quad_t); 1037 break; 1038 case T_U_QUAD: 1039 (void) va_arg(ap, u_quad_t); 1040 break; 1041 case TP_QUAD: 1042 (void) va_arg(ap, quad_t *); 1043 break; 1044 case T_DOUBLE: 1045 (void) va_arg(ap, double); 1046 break; 1047 case T_LONG_DOUBLE: 1048 (void) va_arg(ap, long double); 1049 break; 1050 case TP_CHAR: 1051 (void) va_arg(ap, char *); 1052 break; 1053 case TP_VOID: 1054 (void) va_arg(ap, void *); 1055 break; 1056 } 1057 } 1058 1059 if (typetable != NULL && typetable != stattypetable) { 1060 munmap(typetable, *argtablesiz); 1061 typetable = NULL; 1062 } 1063 } 1064 1065 /* 1066 * Increase the size of the type table. 1067 */ 1068 static int 1069 __grow_type_table(typetable, tablesize) 1070 unsigned char **typetable; 1071 int *tablesize; 1072 { 1073 unsigned char *oldtable = *typetable; 1074 int newsize = *tablesize * 2; 1075 1076 if (*tablesize == STATIC_ARG_TBL_SIZE) { 1077 *typetable = (unsigned char *)mmap(NULL, 1078 sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ, 1079 MAP_ANON|MAP_PRIVATE, -1, 0); 1080 /* XXX unchecked */ 1081 bcopy(oldtable, *typetable, *tablesize); 1082 } else { 1083 char *new = (unsigned char *)mmap(NULL, 1084 sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ, 1085 MAP_ANON|MAP_PRIVATE, -1, 0); 1086 memmove(new, *typetable, *tablesize); 1087 munmap(*typetable, *tablesize); 1088 *typetable = new; 1089 /* XXX unchecked */ 1090 } 1091 memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize)); 1092 1093 *tablesize = newsize; 1094 return(0); 1095 } 1096 1097 1098 #ifdef FLOATING_POINT 1099 1100 extern char *__dtoa(double, int, int, int *, int *, char **); 1101 1102 static char * 1103 cvt(value, ndigits, flags, sign, decpt, ch, length) 1104 double value; 1105 int ndigits, flags, *decpt, ch, *length; 1106 char *sign; 1107 { 1108 int mode, dsgn; 1109 char *digits, *bp, *rve; 1110 1111 if (ch == 'f') { 1112 mode = 3; /* ndigits after the decimal point */ 1113 } else { 1114 /* To obtain ndigits after the decimal point for the 'e' 1115 * and 'E' formats, round to ndigits + 1 significant 1116 * figures. 1117 */ 1118 if (ch == 'e' || ch == 'E') { 1119 ndigits++; 1120 } 1121 mode = 2; /* ndigits significant digits */ 1122 } 1123 1124 if (value < 0) { 1125 value = -value; 1126 *sign = '-'; 1127 } else 1128 *sign = '\000'; 1129 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 1130 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 1131 bp = digits + ndigits; 1132 if (ch == 'f') { 1133 if (*digits == '0' && value) 1134 *decpt = -ndigits + 1; 1135 bp += *decpt; 1136 } 1137 if (value == 0) /* kludge for __dtoa irregularity */ 1138 rve = bp; 1139 while (rve < bp) 1140 *rve++ = '0'; 1141 } 1142 *length = rve - digits; 1143 return (digits); 1144 } 1145 1146 static int 1147 exponent(p0, exp, fmtch) 1148 char *p0; 1149 int exp, fmtch; 1150 { 1151 register char *p, *t; 1152 char expbuf[MAXEXP]; 1153 1154 p = p0; 1155 *p++ = fmtch; 1156 if (exp < 0) { 1157 exp = -exp; 1158 *p++ = '-'; 1159 } 1160 else 1161 *p++ = '+'; 1162 t = expbuf + MAXEXP; 1163 if (exp > 9) { 1164 do { 1165 *--t = to_char(exp % 10); 1166 } while ((exp /= 10) > 9); 1167 *--t = to_char(exp); 1168 for (; t < expbuf + MAXEXP; *p++ = *t++); 1169 } 1170 else { 1171 *p++ = '0'; 1172 *p++ = to_char(exp); 1173 } 1174 return (p - p0); 1175 } 1176 #endif /* FLOATING_POINT */ 1177