vfprintf.c revision 1.35.2.6
1 /* $NetBSD: vfprintf.c,v 1.35.2.6 2002/06/21 18:18:22 nathanw 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 1.35.2.6 2002/06/21 18:18:22 nathanw 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 <stdarg.h> 60 #include <stddef.h> 61 #include <stdint.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <wchar.h> 66 67 #include "reentrant.h" 68 #include "local.h" 69 #include "fvwrite.h" 70 #include "extern.h" 71 72 static int __sprint __P((FILE *, struct __suio *)); 73 static int __sbprintf __P((FILE *, const char *, va_list)) 74 __attribute__((__format__(__printf__, 2, 0))); 75 76 /* 77 * Flush out all the vectors defined by the given uio, 78 * then reset it so that it can be reused. 79 */ 80 static int 81 __sprint(fp, uio) 82 FILE *fp; 83 struct __suio *uio; 84 { 85 int err; 86 87 _DIAGASSERT(fp != NULL); 88 _DIAGASSERT(uio != NULL); 89 90 if (uio->uio_resid == 0) { 91 uio->uio_iovcnt = 0; 92 return (0); 93 } 94 err = __sfvwrite(fp, uio); 95 uio->uio_resid = 0; 96 uio->uio_iovcnt = 0; 97 return (err); 98 } 99 100 /* 101 * Helper function for `fprintf to unbuffered unix file': creates a 102 * temporary buffer. We only work on write-only files; this avoids 103 * worries about ungetc buffers and so forth. 104 */ 105 static int 106 __sbprintf(fp, fmt, ap) 107 FILE *fp; 108 const char *fmt; 109 va_list ap; 110 { 111 int ret; 112 FILE fake; 113 struct __sfileext fakeext; 114 unsigned char buf[BUFSIZ]; 115 116 _DIAGASSERT(fp != NULL); 117 _DIAGASSERT(fmt != NULL); 118 119 _FILEEXT_SETUP(&fake, &fakeext); 120 121 /* copy the important variables */ 122 fake._flags = fp->_flags & ~__SNBF; 123 fake._file = fp->_file; 124 fake._cookie = fp->_cookie; 125 fake._write = fp->_write; 126 127 /* set up the buffer */ 128 fake._bf._base = fake._p = buf; 129 fake._bf._size = fake._w = sizeof(buf); 130 fake._lbfsize = 0; /* not actually used, but Just In Case */ 131 132 /* do the work, then copy any error status */ 133 ret = vfprintf(&fake, fmt, ap); 134 if (ret >= 0 && fflush(&fake)) 135 ret = -1; 136 if (fake._flags & __SERR) 137 fp->_flags |= __SERR; 138 return (ret); 139 } 140 141 142 #ifdef FLOATING_POINT 143 #include <locale.h> 144 #include <math.h> 145 #include "floatio.h" 146 147 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 148 #define DEFPREC 6 149 150 static char *cvt __P((double, int, int, char *, int *, int, int *)); 151 static int exponent __P((char *, int, int)); 152 153 #else /* no FLOATING_POINT */ 154 155 #define BUF 40 156 157 #endif /* FLOATING_POINT */ 158 159 #ifdef lint 160 static __inline void *__UNCONST __P((const void *)); 161 static __inline void * 162 __UNCONST(v) 163 const void *v; 164 { 165 /* LINTED */ 166 return (void *) v; 167 } 168 #else 169 #define __UNCONST(v) (void *)(v) 170 #endif 171 172 /* 173 * Macros for converting digits to letters and vice versa 174 */ 175 #define to_digit(c) ((c) - '0') 176 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 177 #define to_char(n) ((char)((n) + '0')) 178 179 /* 180 * Flags used during conversion. 181 */ 182 #define ALT 0x001 /* alternate form */ 183 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 184 #define LADJUST 0x004 /* left adjustment */ 185 #define LONGDBL 0x008 /* long double; unimplemented */ 186 #define LONGINT 0x010 /* long integer */ 187 #define QUADINT 0x020 /* quad integer */ 188 #define SHORTINT 0x040 /* short integer */ 189 #define MAXINT 0x080 /* (unsigned) intmax_t */ 190 #define PTRINT 0x100 /* (unsigned) ptrdiff_t */ 191 #define SIZEINT 0x200 /* (signed) size_t */ 192 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 193 #define FPT 0x800 /* Floating point number */ 194 195 int 196 vfprintf(fp, fmt0, ap) 197 FILE *fp; 198 const char *fmt0; 199 _BSD_VA_LIST_ ap; 200 { 201 int ret; 202 203 FLOCKFILE(fp); 204 ret = vfprintf_unlocked(fp, fmt0, ap); 205 FUNLOCKFILE(fp); 206 207 return ret; 208 } 209 210 211 212 int 213 vfprintf_unlocked(fp, fmt0, ap) 214 FILE *fp; 215 const char *fmt0; 216 _BSD_VA_LIST_ ap; 217 { 218 const char *fmt;/* format string */ 219 int ch; /* character from fmt */ 220 int n, m; /* handy integers (short term usage) */ 221 const char *cp; /* handy char pointer (short term usage) */ 222 char *bp; /* handy char pointer (short term usage) */ 223 struct __siov *iovp;/* for PRINT macro */ 224 int flags; /* flags as above */ 225 int ret; /* return value accumulator */ 226 int width; /* width from format (%8d), or 0 */ 227 int prec; /* precision from format (%.3d), or -1 */ 228 char sign; /* sign prefix (' ', '+', '-', or \0) */ 229 wchar_t wc; 230 mbstate_t ps; 231 #ifdef FLOATING_POINT 232 char *decimal_point = localeconv()->decimal_point; 233 char softsign; /* temporary negative sign for floats */ 234 double _double = 0; /* double precision arguments %[eEfgG] */ 235 int expt; /* integer value of exponent */ 236 int expsize = 0; /* character count for expstr */ 237 int ndig; /* actual number of digits returned by cvt */ 238 char expstr[7]; /* buffer for exponent string */ 239 #endif 240 241 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 242 #define quad_t long long 243 #define u_quad_t unsigned long long 244 #endif 245 246 #define INTMAX_T intmax_t 247 #define UINTMAX_T uintmax_t 248 249 UINTMAX_T _uintmax; /* integer arguments %[diouxX] */ 250 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 251 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 252 int realsz; /* field size expanded by dprec */ 253 int size; /* size of converted field or string */ 254 char *xdigs = NULL; /* digits for [xX] conversion */ 255 #define NIOV 8 256 struct __suio uio; /* output information: summary */ 257 struct __siov iov[NIOV];/* ... and individual io vectors */ 258 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 259 char ox[2]; /* space for 0x hex-prefix */ 260 261 /* 262 * Choose PADSIZE to trade efficiency vs. size. If larger printf 263 * fields occur frequently, increase PADSIZE and make the initialisers 264 * below longer. 265 */ 266 #define PADSIZE 16 /* pad chunk size */ 267 static const char blanks[PADSIZE] = 268 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 269 static const char zeroes[PADSIZE] = 270 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 271 272 /* 273 * BEWARE, these `goto error' on error, and PAD uses `n'. 274 */ 275 #define PRINT(ptr, len) { \ 276 iovp->iov_base = __UNCONST(ptr); \ 277 iovp->iov_len = (len); \ 278 uio.uio_resid += (len); \ 279 iovp++; \ 280 if (++uio.uio_iovcnt >= NIOV) { \ 281 if (__sprint(fp, &uio)) \ 282 goto error; \ 283 iovp = iov; \ 284 } \ 285 } 286 #define PAD(howmany, with) { \ 287 if ((n = (howmany)) > 0) { \ 288 while (n > PADSIZE) { \ 289 PRINT(with, PADSIZE); \ 290 n -= PADSIZE; \ 291 } \ 292 PRINT(with, n); \ 293 } \ 294 } 295 #define FLUSH() { \ 296 if (uio.uio_resid && __sprint(fp, &uio)) \ 297 goto error; \ 298 uio.uio_iovcnt = 0; \ 299 iovp = iov; \ 300 } 301 302 /* 303 * To extend shorts properly, we need both signed and unsigned 304 * argument extraction methods. 305 */ 306 #define SARG() \ 307 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 308 flags&PTRINT ? va_arg(ap, ptrdiff_t) : \ 309 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 310 flags&QUADINT ? va_arg(ap, quad_t) : \ 311 flags&LONGINT ? va_arg(ap, long) : \ 312 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 313 (long)va_arg(ap, int)) 314 #define UARG() \ 315 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 316 flags&PTRINT ? va_arg(ap, uintptr_t) : /* XXX */ \ 317 flags&SIZEINT ? va_arg(ap, size_t) : \ 318 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 319 flags&LONGINT ? va_arg(ap, u_long) : \ 320 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 321 (u_long)va_arg(ap, u_int)) 322 323 _DIAGASSERT(fp != NULL); 324 _DIAGASSERT(fmt0 != NULL); 325 326 _SET_ORIENTATION(fp, -1); 327 328 /* sorry, fprintf(read_only_file, "") returns -1, not 0 */ 329 if (cantwrite(fp)) { 330 errno = EBADF; 331 return (-1); 332 } 333 334 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 335 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 336 fp->_file >= 0) { 337 ret = __sbprintf(fp, fmt0, ap); 338 return (ret); 339 } 340 341 fmt = fmt0; 342 uio.uio_iov = iovp = iov; 343 uio.uio_resid = 0; 344 uio.uio_iovcnt = 0; 345 ret = 0; 346 347 memset(&ps, 0, sizeof(ps)); 348 349 /* 350 * Scan the format for conversions (`%' character). 351 */ 352 for (;;) { 353 cp = fmt; 354 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { 355 fmt += n; 356 if (wc == '%') { 357 fmt--; 358 break; 359 } 360 } 361 if ((m = fmt - cp) != 0) { 362 PRINT(cp, m); 363 ret += m; 364 } 365 if (n <= 0) 366 goto done; 367 fmt++; /* skip over '%' */ 368 369 flags = 0; 370 dprec = 0; 371 width = 0; 372 prec = -1; 373 sign = '\0'; 374 375 rflag: ch = *fmt++; 376 reswitch: switch (ch) { 377 case ' ': 378 /* 379 * ``If the space and + flags both appear, the space 380 * flag will be ignored.'' 381 * -- ANSI X3J11 382 */ 383 if (!sign) 384 sign = ' '; 385 goto rflag; 386 case '#': 387 flags |= ALT; 388 goto rflag; 389 case '*': 390 /* 391 * ``A negative field width argument is taken as a 392 * - flag followed by a positive field width.'' 393 * -- ANSI X3J11 394 * They don't exclude field widths read from args. 395 */ 396 if ((width = va_arg(ap, int)) >= 0) 397 goto rflag; 398 width = -width; 399 /* FALLTHROUGH */ 400 case '-': 401 flags |= LADJUST; 402 goto rflag; 403 case '+': 404 sign = '+'; 405 goto rflag; 406 case '.': 407 if ((ch = *fmt++) == '*') { 408 n = va_arg(ap, int); 409 prec = n < 0 ? -1 : n; 410 goto rflag; 411 } 412 n = 0; 413 while (is_digit(ch)) { 414 n = 10 * n + to_digit(ch); 415 ch = *fmt++; 416 } 417 prec = n < 0 ? -1 : n; 418 goto reswitch; 419 case '0': 420 /* 421 * ``Note that 0 is taken as a flag, not as the 422 * beginning of a field width.'' 423 * -- ANSI X3J11 424 */ 425 flags |= ZEROPAD; 426 goto rflag; 427 case '1': case '2': case '3': case '4': 428 case '5': case '6': case '7': case '8': case '9': 429 n = 0; 430 do { 431 n = 10 * n + to_digit(ch); 432 ch = *fmt++; 433 } while (is_digit(ch)); 434 width = n; 435 goto reswitch; 436 #ifdef FLOATING_POINT 437 case 'L': 438 flags |= LONGDBL; 439 goto rflag; 440 #endif 441 case 'h': 442 flags |= SHORTINT; 443 goto rflag; 444 case 'j': 445 flags |= MAXINT; 446 goto rflag; 447 case 'l': 448 if (*fmt == 'l') { 449 fmt++; 450 flags |= QUADINT; 451 } else { 452 flags |= LONGINT; 453 } 454 goto rflag; 455 case 'q': 456 flags |= QUADINT; 457 goto rflag; 458 case 't': 459 flags |= PTRINT; 460 goto rflag; 461 case 'z': 462 flags |= SIZEINT; 463 goto rflag; 464 case 'c': 465 *buf = va_arg(ap, int); 466 cp = buf; 467 size = 1; 468 sign = '\0'; 469 break; 470 case 'D': 471 flags |= LONGINT; 472 /*FALLTHROUGH*/ 473 case 'd': 474 case 'i': 475 _uintmax = SARG(); 476 if ((intmax_t)_uintmax < 0) { 477 _uintmax = -_uintmax; 478 sign = '-'; 479 } 480 base = DEC; 481 goto number; 482 #ifdef FLOATING_POINT 483 case 'e': 484 case 'E': 485 case 'f': 486 case 'F': 487 case 'g': 488 case 'G': 489 if (prec == -1) { 490 prec = DEFPREC; 491 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 492 prec = 1; 493 } 494 495 if (flags & LONGDBL) { 496 _double = (double) va_arg(ap, long double); 497 } else { 498 _double = va_arg(ap, double); 499 } 500 501 /* do this before tricky precision changes */ 502 if (isinf(_double)) { 503 if (_double < 0) 504 sign = '-'; 505 if (ch == 'E' || ch == 'F' || ch == 'G') 506 cp = "INF"; 507 else 508 cp = "inf"; 509 size = 3; 510 break; 511 } 512 if (isnan(_double)) { 513 if (ch == 'E' || ch == 'F' || ch == 'G') 514 cp = "NAN"; 515 else 516 cp = "nan"; 517 size = 3; 518 break; 519 } 520 521 flags |= FPT; 522 cp = cvt(_double, prec, flags, &softsign, 523 &expt, ch, &ndig); 524 if (ch == 'g' || ch == 'G') { 525 if (expt <= -4 || expt > prec) 526 ch = (ch == 'g') ? 'e' : 'E'; 527 else 528 ch = 'g'; 529 } 530 if (ch == 'e' || ch == 'E') { 531 --expt; 532 expsize = exponent(expstr, expt, ch); 533 size = expsize + ndig; 534 if (ndig > 1 || flags & ALT) 535 ++size; 536 } else if (ch == 'f' || ch == 'F') { 537 if (expt > 0) { 538 size = expt; 539 if (prec || flags & ALT) 540 size += prec + 1; 541 } else /* "0.X" */ 542 size = prec + 2; 543 } else if (expt >= ndig) { /* fixed g fmt */ 544 size = expt; 545 if (flags & ALT) 546 ++size; 547 } else 548 size = ndig + (expt > 0 ? 549 1 : 2 - expt); 550 551 if (softsign) 552 sign = '-'; 553 break; 554 #endif /* FLOATING_POINT */ 555 case 'n': 556 if (flags & MAXINT) 557 *va_arg(ap, intmax_t *) = ret; 558 else if (flags & PTRINT) 559 *va_arg(ap, ptrdiff_t *) = ret; 560 else if (flags & SIZEINT) 561 *va_arg(ap, ssize_t *) = ret; /* XXX */ 562 else if (flags & QUADINT) 563 *va_arg(ap, quad_t *) = ret; 564 else if (flags & LONGINT) 565 *va_arg(ap, long *) = ret; 566 else if (flags & SHORTINT) 567 *va_arg(ap, short *) = ret; 568 else 569 *va_arg(ap, int *) = ret; 570 continue; /* no output */ 571 case 'O': 572 flags |= LONGINT; 573 /*FALLTHROUGH*/ 574 case 'o': 575 _uintmax = UARG(); 576 base = OCT; 577 goto nosign; 578 case 'p': 579 /* 580 * ``The argument shall be a pointer to void. The 581 * value of the pointer is converted to a sequence 582 * of printable characters, in an implementation- 583 * defined manner.'' 584 * -- ANSI X3J11 585 */ 586 /* NOSTRICT */ 587 _uintmax = (u_long)va_arg(ap, void *); 588 base = HEX; 589 xdigs = "0123456789abcdef"; 590 flags |= HEXPREFIX; 591 ch = 'x'; 592 goto nosign; 593 case 's': 594 if ((cp = va_arg(ap, char *)) == NULL) 595 cp = "(null)"; 596 if (prec >= 0) { 597 /* 598 * can't use strlen; can only look for the 599 * NUL in the first `prec' characters, and 600 * strlen() will go further. 601 */ 602 char *p = memchr(cp, 0, (size_t)prec); 603 604 if (p != NULL) { 605 size = p - cp; 606 if (size > prec) 607 size = prec; 608 } else 609 size = prec; 610 } else 611 size = strlen(cp); 612 sign = '\0'; 613 break; 614 case 'U': 615 flags |= LONGINT; 616 /*FALLTHROUGH*/ 617 case 'u': 618 _uintmax = UARG(); 619 base = DEC; 620 goto nosign; 621 case 'X': 622 xdigs = "0123456789ABCDEF"; 623 goto hex; 624 case 'x': 625 xdigs = "0123456789abcdef"; 626 hex: _uintmax = UARG(); 627 base = HEX; 628 /* leading 0x/X only if non-zero */ 629 if (flags & ALT && _uintmax != 0) 630 flags |= HEXPREFIX; 631 632 /* unsigned conversions */ 633 nosign: sign = '\0'; 634 /* 635 * ``... diouXx conversions ... if a precision is 636 * specified, the 0 flag will be ignored.'' 637 * -- ANSI X3J11 638 */ 639 number: if ((dprec = prec) >= 0) 640 flags &= ~ZEROPAD; 641 642 /* 643 * ``The result of converting a zero value with an 644 * explicit precision of zero is no characters.'' 645 * -- ANSI X3J11 646 */ 647 bp = buf + BUF; 648 if (_uintmax != 0 || prec != 0) { 649 /* 650 * Unsigned mod is hard, and unsigned mod 651 * by a constant is easier than that by 652 * a variable; hence this switch. 653 */ 654 switch (base) { 655 case OCT: 656 do { 657 *--bp = to_char(_uintmax & 7); 658 _uintmax >>= 3; 659 } while (_uintmax); 660 /* handle octal leading 0 */ 661 if (flags & ALT && *bp != '0') 662 *--bp = '0'; 663 break; 664 665 case DEC: 666 /* many numbers are 1 digit */ 667 while (_uintmax >= 10) { 668 *--bp = to_char(_uintmax % 10); 669 _uintmax /= 10; 670 } 671 *--bp = to_char(_uintmax); 672 break; 673 674 case HEX: 675 do { 676 *--bp = xdigs[(size_t) 677 (_uintmax & 15)]; 678 _uintmax >>= 4; 679 } while (_uintmax); 680 break; 681 682 default: 683 cp = "bug in vfprintf: bad base"; 684 size = strlen(cp); 685 goto skipsize; 686 } 687 } 688 cp = bp; 689 size = buf + BUF - bp; 690 skipsize: 691 break; 692 default: /* "%?" prints ?, unless ? is NUL */ 693 if (ch == '\0') 694 goto done; 695 /* pretend it was %c with argument ch */ 696 *buf = ch; 697 cp = buf; 698 size = 1; 699 sign = '\0'; 700 break; 701 } 702 703 /* 704 * All reasonable formats wind up here. At this point, `cp' 705 * points to a string which (if not flags&LADJUST) should be 706 * padded out to `width' places. If flags&ZEROPAD, it should 707 * first be prefixed by any sign or other prefix; otherwise, 708 * it should be blank padded before the prefix is emitted. 709 * After any left-hand padding and prefixing, emit zeroes 710 * required by a decimal [diouxX] precision, then print the 711 * string proper, then emit zeroes required by any leftover 712 * floating precision; finally, if LADJUST, pad with blanks. 713 * 714 * Compute actual size, so we know how much to pad. 715 * size excludes decimal prec; realsz includes it. 716 */ 717 realsz = dprec > size ? dprec : size; 718 if (sign) 719 realsz++; 720 else if (flags & HEXPREFIX) 721 realsz+= 2; 722 723 /* right-adjusting blank padding */ 724 if ((flags & (LADJUST|ZEROPAD)) == 0) 725 PAD(width - realsz, blanks); 726 727 /* prefix */ 728 if (sign) { 729 PRINT(&sign, 1); 730 } else if (flags & HEXPREFIX) { 731 ox[0] = '0'; 732 ox[1] = ch; 733 PRINT(ox, 2); 734 } 735 736 /* right-adjusting zero padding */ 737 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 738 PAD(width - realsz, zeroes); 739 740 /* leading zeroes from decimal precision */ 741 PAD(dprec - size, zeroes); 742 743 /* the string or number proper */ 744 #ifdef FLOATING_POINT 745 if ((flags & FPT) == 0) { 746 PRINT(cp, size); 747 } else { /* glue together f_p fragments */ 748 if (ch >= 'f') { /* 'f' or 'g' */ 749 if (_double == 0) { 750 /* kludge for __dtoa irregularity */ 751 PRINT("0", 1); 752 if (expt < ndig || (flags & ALT) != 0) { 753 PRINT(decimal_point, 1); 754 PAD(ndig - 1, zeroes); 755 } 756 } else if (expt <= 0) { 757 PRINT("0", 1); 758 PRINT(decimal_point, 1); 759 PAD(-expt, zeroes); 760 PRINT(cp, ndig); 761 } else if (expt >= ndig) { 762 PRINT(cp, ndig); 763 PAD(expt - ndig, zeroes); 764 if (flags & ALT) 765 PRINT(".", 1); 766 } else { 767 PRINT(cp, expt); 768 cp += expt; 769 PRINT(".", 1); 770 PRINT(cp, ndig-expt); 771 } 772 } else { /* 'e' or 'E' */ 773 if (ndig > 1 || flags & ALT) { 774 ox[0] = *cp++; 775 ox[1] = '.'; 776 PRINT(ox, 2); 777 if (_double) { 778 PRINT(cp, ndig-1); 779 } else /* 0.[0..] */ 780 /* __dtoa irregularity */ 781 PAD(ndig - 1, zeroes); 782 } else /* XeYYY */ 783 PRINT(cp, 1); 784 PRINT(expstr, expsize); 785 } 786 } 787 #else 788 PRINT(cp, size); 789 #endif 790 /* left-adjusting padding (always blank) */ 791 if (flags & LADJUST) 792 PAD(width - realsz, blanks); 793 794 /* finally, adjust ret */ 795 ret += width > realsz ? width : realsz; 796 797 FLUSH(); /* copy out the I/O vectors */ 798 } 799 done: 800 FLUSH(); 801 error: 802 if (__sferror(fp)) 803 ret = -1; 804 return (ret); 805 } 806 807 #ifdef FLOATING_POINT 808 809 static char * 810 cvt(value, ndigits, flags, sign, decpt, ch, length) 811 double value; 812 int ndigits, flags, *decpt, ch, *length; 813 char *sign; 814 { 815 int mode, dsgn; 816 char *digits, *bp, *rve; 817 818 _DIAGASSERT(decpt != NULL); 819 _DIAGASSERT(length != NULL); 820 _DIAGASSERT(sign != NULL); 821 822 if (ch == 'f') { 823 mode = 3; /* ndigits after the decimal point */ 824 } else { 825 /* To obtain ndigits after the decimal point for the 'e' 826 * and 'E' formats, round to ndigits + 1 significant 827 * figures. 828 */ 829 if (ch == 'e' || ch == 'E') { 830 ndigits++; 831 } 832 mode = 2; /* ndigits significant digits */ 833 } 834 835 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 836 if (dsgn) { 837 value = -value; 838 *sign = '-'; 839 } else 840 *sign = '\000'; 841 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 842 bp = digits + ndigits; 843 if (ch == 'f') { 844 if (*digits == '0' && value) 845 *decpt = -ndigits + 1; 846 bp += *decpt; 847 } 848 if (value == 0) /* kludge for __dtoa irregularity */ 849 rve = bp; 850 while (rve < bp) 851 *rve++ = '0'; 852 } 853 *length = rve - digits; 854 return (digits); 855 } 856 857 static int 858 exponent(p0, expon, fmtch) 859 char *p0; 860 int expon, fmtch; 861 { 862 char *p, *t; 863 char expbuf[MAXEXP]; 864 865 _DIAGASSERT(p0 != NULL); 866 867 p = p0; 868 *p++ = fmtch; 869 if (expon < 0) { 870 expon = -expon; 871 *p++ = '-'; 872 } 873 else 874 *p++ = '+'; 875 t = expbuf + MAXEXP; 876 if (expon > 9) { 877 do { 878 *--t = to_char(expon % 10); 879 } while ((expon /= 10) > 9); 880 *--t = to_char(expon); 881 for (; t < expbuf + MAXEXP; *p++ = *t++); 882 } 883 else { 884 *p++ = '0'; 885 *p++ = to_char(expon); 886 } 887 return (p - p0); 888 } 889 #endif /* FLOATING_POINT */ 890
Indexes created Tue Sep 30 11:09:46 GMT 2025