vfprintf.c revision 1.37
1 /* $NetBSD: vfprintf.c,v 1.37 2001/11/04 13:57:30 lukem 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char *sccsid = "@(#)vfprintf.c 5.50 (Berkeley) 12/16/92"; 43 #else 44 __RCSID("$NetBSD: vfprintf.c,v 1.37 2001/11/04 13:57:30 lukem Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 /* 49 * Actual printf innards. 50 * 51 * This code is large and complicated... 52 */ 53 54 #include "namespace.h" 55 #include <sys/types.h> 56 57 #include <assert.h> 58 #include <errno.h> 59 #include <stddef.h> 60 #include <stdint.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <wchar.h> 65 66 #if __STDC__ 67 #include <stdarg.h> 68 #else 69 #include <varargs.h> 70 #endif 71 72 #include "local.h" 73 #include "fvwrite.h" 74 #include "extern.h" 75 #include "reentrant.h" 76 77 static int __sprint __P((FILE *, struct __suio *)); 78 static int __sbprintf __P((FILE *, const char *, va_list)) 79 __attribute__((__format__(__printf__, 2, 0))); 80 81 /* 82 * Flush out all the vectors defined by the given uio, 83 * then reset it so that it can be reused. 84 */ 85 static int 86 __sprint(fp, uio) 87 FILE *fp; 88 struct __suio *uio; 89 { 90 int err; 91 92 _DIAGASSERT(fp != NULL); 93 _DIAGASSERT(uio != NULL); 94 95 if (uio->uio_resid == 0) { 96 uio->uio_iovcnt = 0; 97 return (0); 98 } 99 err = __sfvwrite(fp, uio); 100 uio->uio_resid = 0; 101 uio->uio_iovcnt = 0; 102 return (err); 103 } 104 105 /* 106 * Helper function for `fprintf to unbuffered unix file': creates a 107 * temporary buffer. We only work on write-only files; this avoids 108 * worries about ungetc buffers and so forth. 109 */ 110 static int 111 __sbprintf(fp, fmt, ap) 112 FILE *fp; 113 const char *fmt; 114 va_list ap; 115 { 116 int ret; 117 FILE fake; 118 unsigned char buf[BUFSIZ]; 119 120 _DIAGASSERT(fp != NULL); 121 _DIAGASSERT(fmt != NULL); 122 123 /* copy the important variables */ 124 fake._flags = fp->_flags & ~__SNBF; 125 fake._file = fp->_file; 126 fake._cookie = fp->_cookie; 127 fake._write = fp->_write; 128 129 /* set up the buffer */ 130 fake._bf._base = fake._p = buf; 131 fake._bf._size = fake._w = sizeof(buf); 132 fake._lbfsize = 0; /* not actually used, but Just In Case */ 133 134 /* do the work, then copy any error status */ 135 ret = vfprintf(&fake, fmt, ap); 136 if (ret >= 0 && fflush(&fake)) 137 ret = -1; 138 if (fake._flags & __SERR) 139 fp->_flags |= __SERR; 140 return (ret); 141 } 142 143 144 #ifdef FLOATING_POINT 145 #include <locale.h> 146 #include <math.h> 147 #include "floatio.h" 148 149 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 150 #define DEFPREC 6 151 152 static char *cvt __P((double, int, int, char *, int *, int, int *)); 153 static int exponent __P((char *, int, int)); 154 155 #else /* no FLOATING_POINT */ 156 157 #define BUF 40 158 159 #endif /* FLOATING_POINT */ 160 161 #ifdef lint 162 static __inline void *__UNCONST __P((const void *)); 163 static __inline void * 164 __UNCONST(v) 165 const void *v; 166 { 167 /* LINTED */ 168 return (void *) v; 169 } 170 #else 171 #define __UNCONST(v) (void *)(v) 172 #endif 173 174 /* 175 * Macros for converting digits to letters and vice versa 176 */ 177 #define to_digit(c) ((c) - '0') 178 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 179 #define to_char(n) ((char)((n) + '0')) 180 181 /* 182 * Flags used during conversion. 183 */ 184 #define ALT 0x001 /* alternate form */ 185 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 186 #define LADJUST 0x004 /* left adjustment */ 187 #define LONGDBL 0x008 /* long double; unimplemented */ 188 #define LONGINT 0x010 /* long integer */ 189 #define QUADINT 0x020 /* quad integer */ 190 #define SHORTINT 0x040 /* short integer */ 191 #define MAXINT 0x080 /* (unsigned) intmax_t */ 192 #define PTRINT 0x100 /* (unsigned) ptrdiff_t */ 193 #define SIZEINT 0x200 /* (signed) size_t */ 194 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 195 #define FPT 0x800 /* Floating point number */ 196 int 197 vfprintf(fp, fmt0, ap) 198 FILE *fp; 199 const char *fmt0; 200 _BSD_VA_LIST_ ap; 201 { 202 const char *fmt;/* format string */ 203 int ch; /* character from fmt */ 204 int n, m; /* handy integers (short term usage) */ 205 const char *cp; /* handy char pointer (short term usage) */ 206 char *bp; /* handy char pointer (short term usage) */ 207 struct __siov *iovp;/* for PRINT macro */ 208 int flags; /* flags as above */ 209 int ret; /* return value accumulator */ 210 int width; /* width from format (%8d), or 0 */ 211 int prec; /* precision from format (%.3d), or -1 */ 212 char sign; /* sign prefix (' ', '+', '-', or \0) */ 213 wchar_t wc; 214 mbstate_t ps; 215 #ifdef FLOATING_POINT 216 char *decimal_point = localeconv()->decimal_point; 217 char softsign; /* temporary negative sign for floats */ 218 double _double = 0; /* double precision arguments %[eEfgG] */ 219 int expt; /* integer value of exponent */ 220 int expsize = 0; /* character count for expstr */ 221 int ndig; /* actual number of digits returned by cvt */ 222 char expstr[7]; /* buffer for exponent string */ 223 #endif 224 225 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 226 #define quad_t long long 227 #define u_quad_t unsigned long long 228 #endif 229 230 #define INTMAX_T intmax_t 231 #define UINTMAX_T uintmax_t 232 233 UINTMAX_T _uintmax; /* integer arguments %[diouxX] */ 234 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 235 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 236 int realsz; /* field size expanded by dprec */ 237 int size; /* size of converted field or string */ 238 char *xdigs = NULL; /* digits for [xX] conversion */ 239 #define NIOV 8 240 struct __suio uio; /* output information: summary */ 241 struct __siov iov[NIOV];/* ... and individual io vectors */ 242 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 243 char ox[2]; /* space for 0x hex-prefix */ 244 245 /* 246 * Choose PADSIZE to trade efficiency vs. size. If larger printf 247 * fields occur frequently, increase PADSIZE and make the initialisers 248 * below longer. 249 */ 250 #define PADSIZE 16 /* pad chunk size */ 251 static const char blanks[PADSIZE] = 252 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 253 static const char zeroes[PADSIZE] = 254 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 255 256 /* 257 * BEWARE, these `goto error' on error, and PAD uses `n'. 258 */ 259 #define PRINT(ptr, len) { \ 260 iovp->iov_base = __UNCONST(ptr); \ 261 iovp->iov_len = (len); \ 262 uio.uio_resid += (len); \ 263 iovp++; \ 264 if (++uio.uio_iovcnt >= NIOV) { \ 265 if (__sprint(fp, &uio)) \ 266 goto error; \ 267 iovp = iov; \ 268 } \ 269 } 270 #define PAD(howmany, with) { \ 271 if ((n = (howmany)) > 0) { \ 272 while (n > PADSIZE) { \ 273 PRINT(with, PADSIZE); \ 274 n -= PADSIZE; \ 275 } \ 276 PRINT(with, n); \ 277 } \ 278 } 279 #define FLUSH() { \ 280 if (uio.uio_resid && __sprint(fp, &uio)) \ 281 goto error; \ 282 uio.uio_iovcnt = 0; \ 283 iovp = iov; \ 284 } 285 286 /* 287 * To extend shorts properly, we need both signed and unsigned 288 * argument extraction methods. 289 */ 290 #define SARG() \ 291 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 292 flags&PTRINT ? va_arg(ap, ptrdiff_t) : \ 293 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 294 flags&QUADINT ? va_arg(ap, quad_t) : \ 295 flags&LONGINT ? va_arg(ap, long) : \ 296 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 297 (long)va_arg(ap, int)) 298 #define UARG() \ 299 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 300 flags&PTRINT ? va_arg(ap, uintptr_t) : /* XXX */ \ 301 flags&SIZEINT ? va_arg(ap, size_t) : \ 302 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 303 flags&LONGINT ? va_arg(ap, u_long) : \ 304 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 305 (u_long)va_arg(ap, u_int)) 306 307 _DIAGASSERT(fp != NULL); 308 _DIAGASSERT(fmt0 != NULL); 309 310 FLOCKFILE(fp); 311 312 /* sorry, fprintf(read_only_file, "") returns -1, not 0 */ 313 if (cantwrite(fp)) { 314 errno = EBADF; 315 FUNLOCKFILE(fp); 316 return (-1); 317 } 318 319 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 320 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 321 fp->_file >= 0) { 322 ret = __sbprintf(fp, fmt0, ap); 323 FUNLOCKFILE(fp); 324 return (ret); 325 } 326 327 fmt = fmt0; 328 uio.uio_iov = iovp = iov; 329 uio.uio_resid = 0; 330 uio.uio_iovcnt = 0; 331 ret = 0; 332 333 memset(&ps, 0, sizeof(ps)); 334 335 /* 336 * Scan the format for conversions (`%' character). 337 */ 338 for (;;) { 339 cp = fmt; 340 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 341 fmt += n; 342 if (wc == '%') { 343 fmt--; 344 break; 345 } 346 } 347 if ((m = fmt - cp) != 0) { 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 if ((width = va_arg(ap, int)) >= 0) 383 goto rflag; 384 width = -width; 385 /* FALLTHROUGH */ 386 case '-': 387 flags |= LADJUST; 388 goto rflag; 389 case '+': 390 sign = '+'; 391 goto rflag; 392 case '.': 393 if ((ch = *fmt++) == '*') { 394 n = va_arg(ap, int); 395 prec = n < 0 ? -1 : n; 396 goto rflag; 397 } 398 n = 0; 399 while (is_digit(ch)) { 400 n = 10 * n + to_digit(ch); 401 ch = *fmt++; 402 } 403 prec = n < 0 ? -1 : n; 404 goto reswitch; 405 case '0': 406 /* 407 * ``Note that 0 is taken as a flag, not as the 408 * beginning of a field width.'' 409 * -- ANSI X3J11 410 */ 411 flags |= ZEROPAD; 412 goto rflag; 413 case '1': case '2': case '3': case '4': 414 case '5': case '6': case '7': case '8': case '9': 415 n = 0; 416 do { 417 n = 10 * n + to_digit(ch); 418 ch = *fmt++; 419 } while (is_digit(ch)); 420 width = n; 421 goto reswitch; 422 #ifdef FLOATING_POINT 423 case 'L': 424 flags |= LONGDBL; 425 goto rflag; 426 #endif 427 case 'h': 428 flags |= SHORTINT; 429 goto rflag; 430 case 'j': 431 flags |= MAXINT; 432 goto rflag; 433 case 'l': 434 if (*fmt == 'l') { 435 fmt++; 436 flags |= QUADINT; 437 } else { 438 flags |= LONGINT; 439 } 440 goto rflag; 441 case 'q': 442 flags |= QUADINT; 443 goto rflag; 444 case 't': 445 flags |= PTRINT; 446 goto rflag; 447 case 'z': 448 flags |= SIZEINT; 449 goto rflag; 450 case 'c': 451 *buf = va_arg(ap, int); 452 cp = buf; 453 size = 1; 454 sign = '\0'; 455 break; 456 case 'D': 457 flags |= LONGINT; 458 /*FALLTHROUGH*/ 459 case 'd': 460 case 'i': 461 _uintmax = SARG(); 462 if ((intmax_t)_uintmax < 0) { 463 _uintmax = -_uintmax; 464 sign = '-'; 465 } 466 base = DEC; 467 goto number; 468 #ifdef FLOATING_POINT 469 case 'e': 470 case 'E': 471 case 'f': 472 case 'g': 473 case 'G': 474 if (prec == -1) { 475 prec = DEFPREC; 476 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 477 prec = 1; 478 } 479 480 if (flags & LONGDBL) { 481 _double = (double) va_arg(ap, long double); 482 } else { 483 _double = va_arg(ap, double); 484 } 485 486 /* do this before tricky precision changes */ 487 if (isinf(_double)) { 488 if (_double < 0) 489 sign = '-'; 490 cp = "Inf"; 491 size = 3; 492 break; 493 } 494 if (isnan(_double)) { 495 cp = "NaN"; 496 size = 3; 497 break; 498 } 499 500 flags |= FPT; 501 cp = cvt(_double, prec, flags, &softsign, 502 &expt, ch, &ndig); 503 if (ch == 'g' || ch == 'G') { 504 if (expt <= -4 || expt > prec) 505 ch = (ch == 'g') ? 'e' : 'E'; 506 else 507 ch = 'g'; 508 } 509 if (ch <= 'e') { /* 'e' or 'E' fmt */ 510 --expt; 511 expsize = exponent(expstr, expt, ch); 512 size = expsize + ndig; 513 if (ndig > 1 || flags & ALT) 514 ++size; 515 } else if (ch == 'f') { /* f fmt */ 516 if (expt > 0) { 517 size = expt; 518 if (prec || flags & ALT) 519 size += prec + 1; 520 } else /* "0.X" */ 521 size = prec + 2; 522 } else if (expt >= ndig) { /* fixed g fmt */ 523 size = expt; 524 if (flags & ALT) 525 ++size; 526 } else 527 size = ndig + (expt > 0 ? 528 1 : 2 - expt); 529 530 if (softsign) 531 sign = '-'; 532 break; 533 #endif /* FLOATING_POINT */ 534 case 'n': 535 if (flags & MAXINT) 536 *va_arg(ap, intmax_t *) = ret; 537 else if (flags & PTRINT) 538 *va_arg(ap, ptrdiff_t *) = ret; 539 else if (flags & SIZEINT) 540 *va_arg(ap, ssize_t *) = ret; /* XXX */ 541 else if (flags & QUADINT) 542 *va_arg(ap, quad_t *) = ret; 543 else if (flags & LONGINT) 544 *va_arg(ap, long *) = ret; 545 else if (flags & SHORTINT) 546 *va_arg(ap, short *) = ret; 547 else 548 *va_arg(ap, int *) = ret; 549 continue; /* no output */ 550 case 'O': 551 flags |= LONGINT; 552 /*FALLTHROUGH*/ 553 case 'o': 554 _uintmax = UARG(); 555 base = OCT; 556 goto nosign; 557 case 'p': 558 /* 559 * ``The argument shall be a pointer to void. The 560 * value of the pointer is converted to a sequence 561 * of printable characters, in an implementation- 562 * defined manner.'' 563 * -- ANSI X3J11 564 */ 565 /* NOSTRICT */ 566 _uintmax = (u_long)va_arg(ap, void *); 567 base = HEX; 568 xdigs = "0123456789abcdef"; 569 flags |= HEXPREFIX; 570 ch = 'x'; 571 goto nosign; 572 case 's': 573 if ((cp = va_arg(ap, char *)) == NULL) 574 cp = "(null)"; 575 if (prec >= 0) { 576 /* 577 * can't use strlen; can only look for the 578 * NUL in the first `prec' characters, and 579 * strlen() will go further. 580 */ 581 char *p = memchr(cp, 0, (size_t)prec); 582 583 if (p != NULL) { 584 size = p - cp; 585 if (size > prec) 586 size = prec; 587 } else 588 size = prec; 589 } else 590 size = strlen(cp); 591 sign = '\0'; 592 break; 593 case 'U': 594 flags |= LONGINT; 595 /*FALLTHROUGH*/ 596 case 'u': 597 _uintmax = UARG(); 598 base = DEC; 599 goto nosign; 600 case 'X': 601 xdigs = "0123456789ABCDEF"; 602 goto hex; 603 case 'x': 604 xdigs = "0123456789abcdef"; 605 hex: _uintmax = UARG(); 606 base = HEX; 607 /* leading 0x/X only if non-zero */ 608 if (flags & ALT && _uintmax != 0) 609 flags |= HEXPREFIX; 610 611 /* unsigned conversions */ 612 nosign: sign = '\0'; 613 /* 614 * ``... diouXx conversions ... if a precision is 615 * specified, the 0 flag will be ignored.'' 616 * -- ANSI X3J11 617 */ 618 number: if ((dprec = prec) >= 0) 619 flags &= ~ZEROPAD; 620 621 /* 622 * ``The result of converting a zero value with an 623 * explicit precision of zero is no characters.'' 624 * -- ANSI X3J11 625 */ 626 bp = buf + BUF; 627 if (_uintmax != 0 || prec != 0) { 628 /* 629 * Unsigned mod is hard, and unsigned mod 630 * by a constant is easier than that by 631 * a variable; hence this switch. 632 */ 633 switch (base) { 634 case OCT: 635 do { 636 *--bp = to_char(_uintmax & 7); 637 _uintmax >>= 3; 638 } while (_uintmax); 639 /* handle octal leading 0 */ 640 if (flags & ALT && *bp != '0') 641 *--bp = '0'; 642 break; 643 644 case DEC: 645 /* many numbers are 1 digit */ 646 while (_uintmax >= 10) { 647 *--bp = to_char(_uintmax % 10); 648 _uintmax /= 10; 649 } 650 *--bp = to_char(_uintmax); 651 break; 652 653 case HEX: 654 do { 655 *--bp = xdigs[(size_t) 656 (_uintmax & 15)]; 657 _uintmax >>= 4; 658 } while (_uintmax); 659 break; 660 661 default: 662 cp = "bug in vfprintf: bad base"; 663 size = strlen(cp); 664 goto skipsize; 665 } 666 } 667 cp = bp; 668 size = buf + BUF - bp; 669 skipsize: 670 break; 671 default: /* "%?" prints ?, unless ? is NUL */ 672 if (ch == '\0') 673 goto done; 674 /* pretend it was %c with argument ch */ 675 *buf = ch; 676 cp = buf; 677 size = 1; 678 sign = '\0'; 679 break; 680 } 681 682 /* 683 * All reasonable formats wind up here. At this point, `cp' 684 * points to a string which (if not flags&LADJUST) should be 685 * padded out to `width' places. If flags&ZEROPAD, it should 686 * first be prefixed by any sign or other prefix; otherwise, 687 * it should be blank padded before the prefix is emitted. 688 * After any left-hand padding and prefixing, emit zeroes 689 * required by a decimal [diouxX] precision, then print the 690 * string proper, then emit zeroes required by any leftover 691 * floating precision; finally, if LADJUST, pad with blanks. 692 * 693 * Compute actual size, so we know how much to pad. 694 * size excludes decimal prec; realsz includes it. 695 */ 696 realsz = dprec > size ? dprec : size; 697 if (sign) 698 realsz++; 699 else if (flags & HEXPREFIX) 700 realsz+= 2; 701 702 /* right-adjusting blank padding */ 703 if ((flags & (LADJUST|ZEROPAD)) == 0) 704 PAD(width - realsz, blanks); 705 706 /* prefix */ 707 if (sign) { 708 PRINT(&sign, 1); 709 } else if (flags & HEXPREFIX) { 710 ox[0] = '0'; 711 ox[1] = ch; 712 PRINT(ox, 2); 713 } 714 715 /* right-adjusting zero padding */ 716 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 717 PAD(width - realsz, zeroes); 718 719 /* leading zeroes from decimal precision */ 720 PAD(dprec - size, zeroes); 721 722 /* the string or number proper */ 723 #ifdef FLOATING_POINT 724 if ((flags & FPT) == 0) { 725 PRINT(cp, size); 726 } else { /* glue together f_p fragments */ 727 if (ch >= 'f') { /* 'f' or 'g' */ 728 if (_double == 0) { 729 /* kludge for __dtoa irregularity */ 730 PRINT("0", 1); 731 if (expt < ndig || (flags & ALT) != 0) { 732 PRINT(decimal_point, 1); 733 PAD(ndig - 1, zeroes); 734 } 735 } else if (expt <= 0) { 736 PRINT("0", 1); 737 PRINT(decimal_point, 1); 738 PAD(-expt, zeroes); 739 PRINT(cp, ndig); 740 } else if (expt >= ndig) { 741 PRINT(cp, ndig); 742 PAD(expt - ndig, zeroes); 743 if (flags & ALT) 744 PRINT(".", 1); 745 } else { 746 PRINT(cp, expt); 747 cp += expt; 748 PRINT(".", 1); 749 PRINT(cp, ndig-expt); 750 } 751 } else { /* 'e' or 'E' */ 752 if (ndig > 1 || flags & ALT) { 753 ox[0] = *cp++; 754 ox[1] = '.'; 755 PRINT(ox, 2); 756 if (_double) { 757 PRINT(cp, ndig-1); 758 } else /* 0.[0..] */ 759 /* __dtoa irregularity */ 760 PAD(ndig - 1, zeroes); 761 } else /* XeYYY */ 762 PRINT(cp, 1); 763 PRINT(expstr, expsize); 764 } 765 } 766 #else 767 PRINT(cp, size); 768 #endif 769 /* left-adjusting padding (always blank) */ 770 if (flags & LADJUST) 771 PAD(width - realsz, blanks); 772 773 /* finally, adjust ret */ 774 ret += width > realsz ? width : realsz; 775 776 FLUSH(); /* copy out the I/O vectors */ 777 } 778 done: 779 FLUSH(); 780 error: 781 if (__sferror(fp)) 782 ret = -1; 783 FUNLOCKFILE(fp); 784 return (ret); 785 } 786 787 #ifdef FLOATING_POINT 788 789 static char * 790 cvt(value, ndigits, flags, sign, decpt, ch, length) 791 double value; 792 int ndigits, flags, *decpt, ch, *length; 793 char *sign; 794 { 795 int mode, dsgn; 796 char *digits, *bp, *rve; 797 798 _DIAGASSERT(decpt != NULL); 799 _DIAGASSERT(length != NULL); 800 _DIAGASSERT(sign != NULL); 801 802 if (ch == 'f') { 803 mode = 3; /* ndigits after the decimal point */ 804 } else { 805 /* To obtain ndigits after the decimal point for the 'e' 806 * and 'E' formats, round to ndigits + 1 significant 807 * figures. 808 */ 809 if (ch == 'e' || ch == 'E') { 810 ndigits++; 811 } 812 mode = 2; /* ndigits significant digits */ 813 } 814 815 if (value < 0) { 816 value = -value; 817 *sign = '-'; 818 } else 819 *sign = '\000'; 820 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 821 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 822 bp = digits + ndigits; 823 if (ch == 'f') { 824 if (*digits == '0' && value) 825 *decpt = -ndigits + 1; 826 bp += *decpt; 827 } 828 if (value == 0) /* kludge for __dtoa irregularity */ 829 rve = bp; 830 while (rve < bp) 831 *rve++ = '0'; 832 } 833 *length = rve - digits; 834 return (digits); 835 } 836 837 static int 838 exponent(p0, expon, fmtch) 839 char *p0; 840 int expon, fmtch; 841 { 842 char *p, *t; 843 char expbuf[MAXEXP]; 844 845 _DIAGASSERT(p0 != NULL); 846 847 p = p0; 848 *p++ = fmtch; 849 if (expon < 0) { 850 expon = -expon; 851 *p++ = '-'; 852 } 853 else 854 *p++ = '+'; 855 t = expbuf + MAXEXP; 856 if (expon > 9) { 857 do { 858 *--t = to_char(expon % 10); 859 } while ((expon /= 10) > 9); 860 *--t = to_char(expon); 861 for (; t < expbuf + MAXEXP; *p++ = *t++); 862 } 863 else { 864 *p++ = '0'; 865 *p++ = to_char(expon); 866 } 867 return (p - p0); 868 } 869 #endif /* FLOATING_POINT */ 870
Indexes created Tue Sep 30 11:09:46 GMT 2025