vfprintf.c revision 1.45
1 /* $NetBSD: vfprintf.c,v 1.45 2003/08/07 16:43:34 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char *sccsid = "@(#)vfprintf.c 5.50 (Berkeley) 12/16/92"; 39 #else 40 __RCSID("$NetBSD: vfprintf.c,v 1.45 2003/08/07 16:43:34 agc Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 /* 45 * Actual printf innards. 46 * 47 * This code is large and complicated... 48 */ 49 50 #include "namespace.h" 51 #include <sys/types.h> 52 53 #include <assert.h> 54 #include <errno.h> 55 #include <stdarg.h> 56 #include <stddef.h> 57 #include <stdint.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <wchar.h> 62 63 #include "reentrant.h" 64 #include "local.h" 65 #include "fvwrite.h" 66 #include "extern.h" 67 68 static int __sprint __P((FILE *, struct __suio *)); 69 static int __sbprintf __P((FILE *, const char *, va_list)) 70 __attribute__((__format__(__printf__, 2, 0))); 71 72 /* 73 * Flush out all the vectors defined by the given uio, 74 * then reset it so that it can be reused. 75 */ 76 static int 77 __sprint(fp, uio) 78 FILE *fp; 79 struct __suio *uio; 80 { 81 int err; 82 83 _DIAGASSERT(fp != NULL); 84 _DIAGASSERT(uio != NULL); 85 86 if (uio->uio_resid == 0) { 87 uio->uio_iovcnt = 0; 88 return (0); 89 } 90 err = __sfvwrite(fp, uio); 91 uio->uio_resid = 0; 92 uio->uio_iovcnt = 0; 93 return (err); 94 } 95 96 /* 97 * Helper function for `fprintf to unbuffered unix file': creates a 98 * temporary buffer. We only work on write-only files; this avoids 99 * worries about ungetc buffers and so forth. 100 */ 101 static int 102 __sbprintf(fp, fmt, ap) 103 FILE *fp; 104 const char *fmt; 105 va_list ap; 106 { 107 int ret; 108 FILE fake; 109 struct __sfileext fakeext; 110 unsigned char buf[BUFSIZ]; 111 112 _DIAGASSERT(fp != NULL); 113 _DIAGASSERT(fmt != NULL); 114 115 _FILEEXT_SETUP(&fake, &fakeext); 116 117 /* copy the important variables */ 118 fake._flags = fp->_flags & ~__SNBF; 119 fake._file = fp->_file; 120 fake._cookie = fp->_cookie; 121 fake._write = fp->_write; 122 123 /* set up the buffer */ 124 fake._bf._base = fake._p = buf; 125 fake._bf._size = fake._w = sizeof(buf); 126 fake._lbfsize = 0; /* not actually used, but Just In Case */ 127 128 /* do the work, then copy any error status */ 129 ret = vfprintf(&fake, fmt, ap); 130 if (ret >= 0 && fflush(&fake)) 131 ret = -1; 132 if (fake._flags & __SERR) 133 fp->_flags |= __SERR; 134 return (ret); 135 } 136 137 138 #ifdef FLOATING_POINT 139 #include <locale.h> 140 #include <math.h> 141 #include "floatio.h" 142 143 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 144 #define DEFPREC 6 145 146 static char *cvt __P((double, int, int, char *, int *, int, int *)); 147 static int exponent __P((char *, int, int)); 148 149 #else /* no FLOATING_POINT */ 150 151 #define BUF 40 152 153 #endif /* FLOATING_POINT */ 154 155 #ifdef lint 156 static __inline void *__UNCONST __P((const void *)); 157 static __inline void * 158 __UNCONST(v) 159 const void *v; 160 { 161 /* LINTED */ 162 return (void *) v; 163 } 164 #else 165 #define __UNCONST(v) (void *)(v) 166 #endif 167 168 /* 169 * Macros for converting digits to letters and vice versa 170 */ 171 #define to_digit(c) ((c) - '0') 172 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 173 #define to_char(n) ((char)((n) + '0')) 174 175 /* 176 * Flags used during conversion. 177 */ 178 #define ALT 0x001 /* alternate form */ 179 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 180 #define LADJUST 0x004 /* left adjustment */ 181 #define LONGDBL 0x008 /* long double; unimplemented */ 182 #define LONGINT 0x010 /* long integer */ 183 #define QUADINT 0x020 /* quad integer */ 184 #define SHORTINT 0x040 /* short integer */ 185 #define MAXINT 0x080 /* (unsigned) intmax_t */ 186 #define PTRINT 0x100 /* (unsigned) ptrdiff_t */ 187 #define SIZEINT 0x200 /* (signed) size_t */ 188 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 189 #define FPT 0x800 /* Floating point number */ 190 191 int 192 vfprintf(fp, fmt0, ap) 193 FILE *fp; 194 const char *fmt0; 195 _BSD_VA_LIST_ ap; 196 { 197 int ret; 198 199 FLOCKFILE(fp); 200 ret = vfprintf_unlocked(fp, fmt0, ap); 201 FUNLOCKFILE(fp); 202 203 return ret; 204 } 205 206 207 208 int 209 vfprintf_unlocked(fp, fmt0, ap) 210 FILE *fp; 211 const char *fmt0; 212 _BSD_VA_LIST_ ap; 213 { 214 const char *fmt;/* format string */ 215 int ch; /* character from fmt */ 216 int n, m; /* handy integers (short term usage) */ 217 const char *cp; /* handy char pointer (short term usage) */ 218 char *bp; /* handy char pointer (short term usage) */ 219 struct __siov *iovp;/* for PRINT macro */ 220 int flags; /* flags as above */ 221 int ret; /* return value accumulator */ 222 int width; /* width from format (%8d), or 0 */ 223 int prec; /* precision from format (%.3d), or -1 */ 224 char sign; /* sign prefix (' ', '+', '-', or \0) */ 225 wchar_t wc; 226 mbstate_t ps; 227 #ifdef FLOATING_POINT 228 char *decimal_point = localeconv()->decimal_point; 229 char softsign; /* temporary negative sign for floats */ 230 double _double = 0; /* double precision arguments %[eEfgG] */ 231 int expt; /* integer value of exponent */ 232 int expsize = 0; /* character count for expstr */ 233 int ndig; /* actual number of digits returned by cvt */ 234 char expstr[7]; /* buffer for exponent string */ 235 #endif 236 237 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 238 #define quad_t long long 239 #define u_quad_t unsigned long long 240 #endif 241 242 #define INTMAX_T intmax_t 243 #define UINTMAX_T uintmax_t 244 245 UINTMAX_T _uintmax; /* integer arguments %[diouxX] */ 246 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 247 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 248 int realsz; /* field size expanded by dprec */ 249 int size; /* size of converted field or string */ 250 char *xdigs = NULL; /* digits for [xX] conversion */ 251 #define NIOV 8 252 struct __suio uio; /* output information: summary */ 253 struct __siov iov[NIOV];/* ... and individual io vectors */ 254 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 255 char ox[2]; /* space for 0x hex-prefix */ 256 257 /* 258 * Choose PADSIZE to trade efficiency vs. size. If larger printf 259 * fields occur frequently, increase PADSIZE and make the initialisers 260 * below longer. 261 */ 262 #define PADSIZE 16 /* pad chunk size */ 263 static const char blanks[PADSIZE] = 264 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 265 static const char zeroes[PADSIZE] = 266 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 267 268 /* 269 * BEWARE, these `goto error' on error, and PAD uses `n'. 270 */ 271 #define PRINT(ptr, len) { \ 272 iovp->iov_base = __UNCONST(ptr); \ 273 iovp->iov_len = (len); \ 274 uio.uio_resid += (len); \ 275 iovp++; \ 276 if (++uio.uio_iovcnt >= NIOV) { \ 277 if (__sprint(fp, &uio)) \ 278 goto error; \ 279 iovp = iov; \ 280 } \ 281 } 282 #define PAD(howmany, with) { \ 283 if ((n = (howmany)) > 0) { \ 284 while (n > PADSIZE) { \ 285 PRINT(with, PADSIZE); \ 286 n -= PADSIZE; \ 287 } \ 288 PRINT(with, n); \ 289 } \ 290 } 291 #define FLUSH() { \ 292 if (uio.uio_resid && __sprint(fp, &uio)) \ 293 goto error; \ 294 uio.uio_iovcnt = 0; \ 295 iovp = iov; \ 296 } 297 298 /* 299 * To extend shorts properly, we need both signed and unsigned 300 * argument extraction methods. 301 */ 302 #define SARG() \ 303 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 304 flags&PTRINT ? va_arg(ap, ptrdiff_t) : \ 305 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 306 flags&QUADINT ? va_arg(ap, quad_t) : \ 307 flags&LONGINT ? va_arg(ap, long) : \ 308 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 309 (long)va_arg(ap, int)) 310 #define UARG() \ 311 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 312 flags&PTRINT ? va_arg(ap, uintptr_t) : /* XXX */ \ 313 flags&SIZEINT ? va_arg(ap, size_t) : \ 314 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 315 flags&LONGINT ? va_arg(ap, u_long) : \ 316 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 317 (u_long)va_arg(ap, u_int)) 318 319 _DIAGASSERT(fp != NULL); 320 _DIAGASSERT(fmt0 != NULL); 321 322 _SET_ORIENTATION(fp, -1); 323 324 /* sorry, fprintf(read_only_file, "") returns -1, not 0 */ 325 if (cantwrite(fp)) { 326 errno = EBADF; 327 return (-1); 328 } 329 330 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 331 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 332 fp->_file >= 0) { 333 ret = __sbprintf(fp, fmt0, ap); 334 return (ret); 335 } 336 337 fmt = fmt0; 338 uio.uio_iov = iovp = iov; 339 uio.uio_resid = 0; 340 uio.uio_iovcnt = 0; 341 ret = 0; 342 343 memset(&ps, 0, sizeof(ps)); 344 345 /* 346 * Scan the format for conversions (`%' character). 347 */ 348 for (;;) { 349 cp = fmt; 350 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 351 fmt += n; 352 if (wc == '%') { 353 fmt--; 354 break; 355 } 356 } 357 if ((m = fmt - cp) != 0) { 358 PRINT(cp, m); 359 ret += m; 360 } 361 if (n <= 0) 362 goto done; 363 fmt++; /* skip over '%' */ 364 365 flags = 0; 366 dprec = 0; 367 width = 0; 368 prec = -1; 369 sign = '\0'; 370 371 rflag: ch = *fmt++; 372 reswitch: switch (ch) { 373 case ' ': 374 /* 375 * ``If the space and + flags both appear, the space 376 * flag will be ignored.'' 377 * -- ANSI X3J11 378 */ 379 if (!sign) 380 sign = ' '; 381 goto rflag; 382 case '#': 383 flags |= ALT; 384 goto rflag; 385 case '*': 386 /* 387 * ``A negative field width argument is taken as a 388 * - flag followed by a positive field width.'' 389 * -- ANSI X3J11 390 * They don't exclude field widths read from args. 391 */ 392 if ((width = va_arg(ap, int)) >= 0) 393 goto rflag; 394 width = -width; 395 /* FALLTHROUGH */ 396 case '-': 397 flags |= LADJUST; 398 goto rflag; 399 case '+': 400 sign = '+'; 401 goto rflag; 402 case '.': 403 if ((ch = *fmt++) == '*') { 404 n = va_arg(ap, int); 405 prec = n < 0 ? -1 : n; 406 goto rflag; 407 } 408 n = 0; 409 while (is_digit(ch)) { 410 n = 10 * n + to_digit(ch); 411 ch = *fmt++; 412 } 413 prec = n < 0 ? -1 : n; 414 goto reswitch; 415 case '0': 416 /* 417 * ``Note that 0 is taken as a flag, not as the 418 * beginning of a field width.'' 419 * -- ANSI X3J11 420 */ 421 flags |= ZEROPAD; 422 goto rflag; 423 case '1': case '2': case '3': case '4': 424 case '5': case '6': case '7': case '8': case '9': 425 n = 0; 426 do { 427 n = 10 * n + to_digit(ch); 428 ch = *fmt++; 429 } while (is_digit(ch)); 430 width = n; 431 goto reswitch; 432 #ifdef FLOATING_POINT 433 case 'L': 434 flags |= LONGDBL; 435 goto rflag; 436 #endif 437 case 'h': 438 flags |= SHORTINT; 439 goto rflag; 440 case 'j': 441 flags |= MAXINT; 442 goto rflag; 443 case 'l': 444 if (*fmt == 'l') { 445 fmt++; 446 flags |= QUADINT; 447 } else { 448 flags |= LONGINT; 449 } 450 goto rflag; 451 case 'q': 452 flags |= QUADINT; 453 goto rflag; 454 case 't': 455 flags |= PTRINT; 456 goto rflag; 457 case 'z': 458 flags |= SIZEINT; 459 goto rflag; 460 case 'c': 461 *buf = va_arg(ap, int); 462 cp = buf; 463 size = 1; 464 sign = '\0'; 465 break; 466 case 'D': 467 flags |= LONGINT; 468 /*FALLTHROUGH*/ 469 case 'd': 470 case 'i': 471 _uintmax = SARG(); 472 if ((intmax_t)_uintmax < 0) { 473 _uintmax = -_uintmax; 474 sign = '-'; 475 } 476 base = DEC; 477 goto number; 478 #ifdef FLOATING_POINT 479 case 'e': 480 case 'E': 481 case 'f': 482 case 'F': 483 case 'g': 484 case 'G': 485 if (prec == -1) { 486 prec = DEFPREC; 487 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 488 prec = 1; 489 } 490 491 if (flags & LONGDBL) { 492 _double = (double) va_arg(ap, long double); 493 } else { 494 _double = va_arg(ap, double); 495 } 496 497 /* do this before tricky precision changes */ 498 if (isinf(_double)) { 499 if (_double < 0) 500 sign = '-'; 501 if (ch == 'E' || ch == 'F' || ch == 'G') 502 cp = "INF"; 503 else 504 cp = "inf"; 505 size = 3; 506 break; 507 } 508 if (isnan(_double)) { 509 if (ch == 'E' || ch == 'F' || ch == 'G') 510 cp = "NAN"; 511 else 512 cp = "nan"; 513 size = 3; 514 break; 515 } 516 517 flags |= FPT; 518 cp = cvt(_double, prec, flags, &softsign, 519 &expt, ch, &ndig); 520 if (ch == 'g' || ch == 'G') { 521 if (expt <= -4 || expt > prec) 522 ch = (ch == 'g') ? 'e' : 'E'; 523 else 524 ch = 'g'; 525 } 526 if (ch == 'e' || ch == 'E') { 527 --expt; 528 expsize = exponent(expstr, expt, ch); 529 size = expsize + ndig; 530 if (ndig > 1 || flags & ALT) 531 ++size; 532 } else if (ch == 'f' || ch == 'F') { 533 if (expt > 0) { 534 size = expt; 535 if (prec || flags & ALT) 536 size += prec + 1; 537 } else /* "0.X" */ 538 size = prec + 2; 539 } else if (expt >= ndig) { /* fixed g fmt */ 540 size = expt; 541 if (flags & ALT) 542 ++size; 543 } else 544 size = ndig + (expt > 0 ? 545 1 : 2 - expt); 546 547 if (softsign) 548 sign = '-'; 549 break; 550 #endif /* FLOATING_POINT */ 551 case 'n': 552 if (flags & MAXINT) 553 *va_arg(ap, intmax_t *) = ret; 554 else if (flags & PTRINT) 555 *va_arg(ap, ptrdiff_t *) = ret; 556 else if (flags & SIZEINT) 557 *va_arg(ap, ssize_t *) = ret; /* XXX */ 558 else if (flags & QUADINT) 559 *va_arg(ap, quad_t *) = ret; 560 else if (flags & LONGINT) 561 *va_arg(ap, long *) = ret; 562 else if (flags & SHORTINT) 563 *va_arg(ap, short *) = ret; 564 else 565 *va_arg(ap, int *) = ret; 566 continue; /* no output */ 567 case 'O': 568 flags |= LONGINT; 569 /*FALLTHROUGH*/ 570 case 'o': 571 _uintmax = UARG(); 572 base = OCT; 573 goto nosign; 574 case 'p': 575 /* 576 * ``The argument shall be a pointer to void. The 577 * value of the pointer is converted to a sequence 578 * of printable characters, in an implementation- 579 * defined manner.'' 580 * -- ANSI X3J11 581 */ 582 /* NOSTRICT */ 583 _uintmax = (u_long)va_arg(ap, void *); 584 base = HEX; 585 xdigs = "0123456789abcdef"; 586 flags |= HEXPREFIX; 587 ch = 'x'; 588 goto nosign; 589 case 's': 590 if ((cp = va_arg(ap, char *)) == NULL) 591 cp = "(null)"; 592 if (prec >= 0) { 593 /* 594 * can't use strlen; can only look for the 595 * NUL in the first `prec' characters, and 596 * strlen() will go further. 597 */ 598 char *p = memchr(cp, 0, (size_t)prec); 599 600 if (p != NULL) { 601 size = p - cp; 602 if (size > prec) 603 size = prec; 604 } else 605 size = prec; 606 } else 607 size = strlen(cp); 608 sign = '\0'; 609 break; 610 case 'U': 611 flags |= LONGINT; 612 /*FALLTHROUGH*/ 613 case 'u': 614 _uintmax = UARG(); 615 base = DEC; 616 goto nosign; 617 case 'X': 618 xdigs = "0123456789ABCDEF"; 619 goto hex; 620 case 'x': 621 xdigs = "0123456789abcdef"; 622 hex: _uintmax = UARG(); 623 base = HEX; 624 /* leading 0x/X only if non-zero */ 625 if (flags & ALT && _uintmax != 0) 626 flags |= HEXPREFIX; 627 628 /* unsigned conversions */ 629 nosign: sign = '\0'; 630 /* 631 * ``... diouXx conversions ... if a precision is 632 * specified, the 0 flag will be ignored.'' 633 * -- ANSI X3J11 634 */ 635 number: if ((dprec = prec) >= 0) 636 flags &= ~ZEROPAD; 637 638 /* 639 * ``The result of converting a zero value with an 640 * explicit precision of zero is no characters.'' 641 * -- ANSI X3J11 642 */ 643 bp = buf + BUF; 644 if (_uintmax != 0 || prec != 0) { 645 /* 646 * Unsigned mod is hard, and unsigned mod 647 * by a constant is easier than that by 648 * a variable; hence this switch. 649 */ 650 switch (base) { 651 case OCT: 652 do { 653 *--bp = to_char(_uintmax & 7); 654 _uintmax >>= 3; 655 } while (_uintmax); 656 /* handle octal leading 0 */ 657 if (flags & ALT && *bp != '0') 658 *--bp = '0'; 659 break; 660 661 case DEC: 662 /* many numbers are 1 digit */ 663 while (_uintmax >= 10) { 664 *--bp = to_char(_uintmax % 10); 665 _uintmax /= 10; 666 } 667 *--bp = to_char(_uintmax); 668 break; 669 670 case HEX: 671 do { 672 *--bp = xdigs[(size_t) 673 (_uintmax & 15)]; 674 _uintmax >>= 4; 675 } while (_uintmax); 676 break; 677 678 default: 679 cp = "bug in vfprintf: bad base"; 680 size = strlen(cp); 681 goto skipsize; 682 } 683 } 684 cp = bp; 685 size = buf + BUF - bp; 686 skipsize: 687 break; 688 default: /* "%?" prints ?, unless ? is NUL */ 689 if (ch == '\0') 690 goto done; 691 /* pretend it was %c with argument ch */ 692 *buf = ch; 693 cp = buf; 694 size = 1; 695 sign = '\0'; 696 break; 697 } 698 699 /* 700 * All reasonable formats wind up here. At this point, `cp' 701 * points to a string which (if not flags&LADJUST) should be 702 * padded out to `width' places. If flags&ZEROPAD, it should 703 * first be prefixed by any sign or other prefix; otherwise, 704 * it should be blank padded before the prefix is emitted. 705 * After any left-hand padding and prefixing, emit zeroes 706 * required by a decimal [diouxX] precision, then print the 707 * string proper, then emit zeroes required by any leftover 708 * floating precision; finally, if LADJUST, pad with blanks. 709 * 710 * Compute actual size, so we know how much to pad. 711 * size excludes decimal prec; realsz includes it. 712 */ 713 realsz = dprec > size ? dprec : size; 714 if (sign) 715 realsz++; 716 else if (flags & HEXPREFIX) 717 realsz+= 2; 718 719 /* right-adjusting blank padding */ 720 if ((flags & (LADJUST|ZEROPAD)) == 0) 721 PAD(width - realsz, blanks); 722 723 /* prefix */ 724 if (sign) { 725 PRINT(&sign, 1); 726 } else if (flags & HEXPREFIX) { 727 ox[0] = '0'; 728 ox[1] = ch; 729 PRINT(ox, 2); 730 } 731 732 /* right-adjusting zero padding */ 733 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 734 PAD(width - realsz, zeroes); 735 736 /* leading zeroes from decimal precision */ 737 PAD(dprec - size, zeroes); 738 739 /* the string or number proper */ 740 #ifdef FLOATING_POINT 741 if ((flags & FPT) == 0) { 742 PRINT(cp, size); 743 } else { /* glue together f_p fragments */ 744 if (ch >= 'f') { /* 'f' or 'g' */ 745 if (_double == 0) { 746 /* kludge for __dtoa irregularity */ 747 PRINT("0", 1); 748 if (expt < ndig || (flags & ALT) != 0) { 749 PRINT(decimal_point, 1); 750 PAD(ndig - 1, zeroes); 751 } 752 } else if (expt <= 0) { 753 PRINT("0", 1); 754 PRINT(decimal_point, 1); 755 PAD(-expt, zeroes); 756 PRINT(cp, ndig); 757 } else if (expt >= ndig) { 758 PRINT(cp, ndig); 759 PAD(expt - ndig, zeroes); 760 if (flags & ALT) 761 PRINT(".", 1); 762 } else { 763 PRINT(cp, expt); 764 cp += expt; 765 PRINT(".", 1); 766 PRINT(cp, ndig-expt); 767 } 768 } else { /* 'e' or 'E' */ 769 if (ndig > 1 || flags & ALT) { 770 ox[0] = *cp++; 771 ox[1] = '.'; 772 PRINT(ox, 2); 773 if (_double) { 774 PRINT(cp, ndig-1); 775 } else /* 0.[0..] */ 776 /* __dtoa irregularity */ 777 PAD(ndig - 1, zeroes); 778 } else /* XeYYY */ 779 PRINT(cp, 1); 780 PRINT(expstr, expsize); 781 } 782 } 783 #else 784 PRINT(cp, size); 785 #endif 786 /* left-adjusting padding (always blank) */ 787 if (flags & LADJUST) 788 PAD(width - realsz, blanks); 789 790 /* finally, adjust ret */ 791 ret += width > realsz ? width : realsz; 792 793 FLUSH(); /* copy out the I/O vectors */ 794 } 795 done: 796 FLUSH(); 797 error: 798 if (__sferror(fp)) 799 ret = -1; 800 return (ret); 801 } 802 803 #ifdef FLOATING_POINT 804 805 static char * 806 cvt(value, ndigits, flags, sign, decpt, ch, length) 807 double value; 808 int ndigits, flags, *decpt, ch, *length; 809 char *sign; 810 { 811 int mode, dsgn; 812 char *digits, *bp, *rve; 813 814 _DIAGASSERT(decpt != NULL); 815 _DIAGASSERT(length != NULL); 816 _DIAGASSERT(sign != NULL); 817 818 if (ch == 'f') { 819 mode = 3; /* ndigits after the decimal point */ 820 } else { 821 /* To obtain ndigits after the decimal point for the 'e' 822 * and 'E' formats, round to ndigits + 1 significant 823 * figures. 824 */ 825 if (ch == 'e' || ch == 'E') { 826 ndigits++; 827 } 828 mode = 2; /* ndigits significant digits */ 829 } 830 831 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 832 if (dsgn) { 833 value = -value; 834 *sign = '-'; 835 } else 836 *sign = '\000'; 837 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 838 bp = digits + ndigits; 839 if (ch == 'f') { 840 if (*digits == '0' && value) 841 *decpt = -ndigits + 1; 842 bp += *decpt; 843 } 844 if (value == 0) /* kludge for __dtoa irregularity */ 845 rve = bp; 846 while (rve < bp) 847 *rve++ = '0'; 848 } 849 *length = rve - digits; 850 return (digits); 851 } 852 853 static int 854 exponent(p0, expon, fmtch) 855 char *p0; 856 int expon, fmtch; 857 { 858 char *p, *t; 859 char expbuf[MAXEXP]; 860 861 _DIAGASSERT(p0 != NULL); 862 863 p = p0; 864 *p++ = fmtch; 865 if (expon < 0) { 866 expon = -expon; 867 *p++ = '-'; 868 } 869 else 870 *p++ = '+'; 871 t = expbuf + MAXEXP; 872 if (expon > 9) { 873 do { 874 *--t = to_char(expon % 10); 875 } while ((expon /= 10) > 9); 876 *--t = to_char(expon); 877 for (; t < expbuf + MAXEXP; *p++ = *t++); 878 } 879 else { 880 *p++ = '0'; 881 *p++ = to_char(expon); 882 } 883 return (p - p0); 884 } 885 #endif /* FLOATING_POINT */ 886
Indexes created Tue Sep 30 11:09:46 GMT 2025