vfprintf.c revision 1.33
1 /* $NetBSD: vfprintf.c,v 1.33 2000/07/08 14:57:57 sommerfeld 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 1.33 2000/07/08 14:57:57 sommerfeld 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 <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #if __STDC__ 64 #include <stdarg.h> 65 #else 66 #include <varargs.h> 67 #endif 68 69 #include "local.h" 70 #include "fvwrite.h" 71 #include "extern.h" 72 #include "reentrant.h" 73 74 static int __sprint __P((FILE *, struct __suio *)); 75 static int __sbprintf __P((FILE *, const char *, va_list)) 76 __attribute__((__format__(__printf__, 2, 0))); 77 78 /* 79 * Flush out all the vectors defined by the given uio, 80 * then reset it so that it can be reused. 81 */ 82 static int 83 __sprint(fp, uio) 84 FILE *fp; 85 struct __suio *uio; 86 { 87 int err; 88 89 _DIAGASSERT(fp != NULL); 90 _DIAGASSERT(uio != NULL); 91 92 if (uio->uio_resid == 0) { 93 uio->uio_iovcnt = 0; 94 return (0); 95 } 96 err = __sfvwrite(fp, uio); 97 uio->uio_resid = 0; 98 uio->uio_iovcnt = 0; 99 return (err); 100 } 101 102 /* 103 * Helper function for `fprintf to unbuffered unix file': creates a 104 * temporary buffer. We only work on write-only files; this avoids 105 * worries about ungetc buffers and so forth. 106 */ 107 static int 108 __sbprintf(fp, fmt, ap) 109 FILE *fp; 110 const char *fmt; 111 va_list ap; 112 { 113 int ret; 114 FILE fake; 115 unsigned char buf[BUFSIZ]; 116 117 _DIAGASSERT(fp != NULL); 118 _DIAGASSERT(fmt != NULL); 119 120 /* copy the important variables */ 121 fake._flags = fp->_flags & ~__SNBF; 122 fake._file = fp->_file; 123 fake._cookie = fp->_cookie; 124 fake._write = fp->_write; 125 126 /* set up the buffer */ 127 fake._bf._base = fake._p = buf; 128 fake._bf._size = fake._w = sizeof(buf); 129 fake._lbfsize = 0; /* not actually used, but Just In Case */ 130 131 /* do the work, then copy any error status */ 132 ret = vfprintf(&fake, fmt, ap); 133 if (ret >= 0 && fflush(&fake)) 134 ret = -1; 135 if (fake._flags & __SERR) 136 fp->_flags |= __SERR; 137 return (ret); 138 } 139 140 141 #ifdef FLOATING_POINT 142 #include <locale.h> 143 #include <math.h> 144 #include "floatio.h" 145 146 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 147 #define DEFPREC 6 148 149 static char *cvt __P((double, int, int, char *, int *, int, int *)); 150 static int exponent __P((char *, int, int)); 151 152 #else /* no FLOATING_POINT */ 153 154 #define BUF 40 155 156 #endif /* FLOATING_POINT */ 157 158 #ifdef lint 159 static __inline void *__UNCONST __P((const void *)); 160 static __inline void * 161 __UNCONST(v) 162 const void *v; 163 { 164 /* LINTED */ 165 return (void *) v; 166 } 167 #else 168 #define __UNCONST(v) (void *)(v) 169 #endif 170 171 /* 172 * Macros for converting digits to letters and vice versa 173 */ 174 #define to_digit(c) ((c) - '0') 175 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 176 #define to_char(n) ((char)((n) + '0')) 177 178 /* 179 * Flags used during conversion. 180 */ 181 #define ALT 0x001 /* alternate form */ 182 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 183 #define LADJUST 0x004 /* left adjustment */ 184 #define LONGDBL 0x008 /* long double; unimplemented */ 185 #define LONGINT 0x010 /* long integer */ 186 #define QUADINT 0x020 /* quad integer */ 187 #define SHORTINT 0x040 /* short integer */ 188 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 189 #define FPT 0x100 /* Floating point number */ 190 int 191 vfprintf(fp, fmt0, ap) 192 FILE *fp; 193 const char *fmt0; 194 _BSD_VA_LIST_ ap; 195 { 196 const char *fmt;/* format string */ 197 int ch; /* character from fmt */ 198 int n, m; /* handy integers (short term usage) */ 199 const char *cp; /* handy char pointer (short term usage) */ 200 char *bp; /* handy char pointer (short term usage) */ 201 struct __siov *iovp;/* for PRINT macro */ 202 int flags; /* flags as above */ 203 int ret; /* return value accumulator */ 204 int width; /* width from format (%8d), or 0 */ 205 int prec; /* precision from format (%.3d), or -1 */ 206 char sign; /* sign prefix (' ', '+', '-', or \0) */ 207 wchar_t wc; 208 #ifdef FLOATING_POINT 209 char *decimal_point = localeconv()->decimal_point; 210 char softsign; /* temporary negative sign for floats */ 211 double _double = 0; /* double precision arguments %[eEfgG] */ 212 int expt; /* integer value of exponent */ 213 int expsize = 0; /* character count for expstr */ 214 int ndig; /* actual number of digits returned by cvt */ 215 char expstr[7]; /* buffer for exponent string */ 216 #endif 217 218 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 219 #define quad_t long long 220 #define u_quad_t unsigned long long 221 #endif 222 223 u_quad_t _uquad; /* integer arguments %[diouxX] */ 224 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 225 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 226 int realsz; /* field size expanded by dprec */ 227 int size; /* size of converted field or string */ 228 char *xdigs = NULL; /* digits for [xX] conversion */ 229 #define NIOV 8 230 struct __suio uio; /* output information: summary */ 231 struct __siov iov[NIOV];/* ... and individual io vectors */ 232 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 233 char ox[2]; /* space for 0x hex-prefix */ 234 235 /* 236 * Choose PADSIZE to trade efficiency vs. size. If larger printf 237 * fields occur frequently, increase PADSIZE and make the initialisers 238 * below longer. 239 */ 240 #define PADSIZE 16 /* pad chunk size */ 241 static const char blanks[PADSIZE] = 242 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 243 static const char zeroes[PADSIZE] = 244 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 245 246 /* 247 * BEWARE, these `goto error' on error, and PAD uses `n'. 248 */ 249 #define PRINT(ptr, len) { \ 250 iovp->iov_base = __UNCONST(ptr); \ 251 iovp->iov_len = (len); \ 252 uio.uio_resid += (len); \ 253 iovp++; \ 254 if (++uio.uio_iovcnt >= NIOV) { \ 255 if (__sprint(fp, &uio)) \ 256 goto error; \ 257 iovp = iov; \ 258 } \ 259 } 260 #define PAD(howmany, with) { \ 261 if ((n = (howmany)) > 0) { \ 262 while (n > PADSIZE) { \ 263 PRINT(with, PADSIZE); \ 264 n -= PADSIZE; \ 265 } \ 266 PRINT(with, n); \ 267 } \ 268 } 269 #define FLUSH() { \ 270 if (uio.uio_resid && __sprint(fp, &uio)) \ 271 goto error; \ 272 uio.uio_iovcnt = 0; \ 273 iovp = iov; \ 274 } 275 276 /* 277 * To extend shorts properly, we need both signed and unsigned 278 * argument extraction methods. 279 */ 280 #define SARG() \ 281 (flags&QUADINT ? va_arg(ap, quad_t) : \ 282 flags&LONGINT ? va_arg(ap, long) : \ 283 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 284 (long)va_arg(ap, int)) 285 #define UARG() \ 286 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 287 flags&LONGINT ? va_arg(ap, u_long) : \ 288 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 289 (u_long)va_arg(ap, u_int)) 290 291 _DIAGASSERT(fp != NULL); 292 _DIAGASSERT(fmt0 != NULL); 293 294 FLOCKFILE(fp); 295 296 /* sorry, fprintf(read_only_file, "") returns -1, not 0 */ 297 if (cantwrite(fp)) { 298 errno = EBADF; 299 FUNLOCKFILE(fp); 300 return (-1); 301 } 302 303 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 304 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 305 fp->_file >= 0) { 306 ret = __sbprintf(fp, fmt0, ap); 307 FUNLOCKFILE(fp); 308 return (ret); 309 } 310 311 fmt = fmt0; 312 uio.uio_iov = iovp = iov; 313 uio.uio_resid = 0; 314 uio.uio_iovcnt = 0; 315 ret = 0; 316 317 /* 318 * Scan the format for conversions (`%' character). 319 */ 320 for (;;) { 321 cp = fmt; 322 while ((n = mbtowc(&wc, fmt, MB_CUR_MAX)) > 0) { 323 fmt += n; 324 if (wc == '%') { 325 fmt--; 326 break; 327 } 328 } 329 if ((m = fmt - cp) != 0) { 330 PRINT(cp, m); 331 ret += m; 332 } 333 if (n <= 0) 334 goto done; 335 fmt++; /* skip over '%' */ 336 337 flags = 0; 338 dprec = 0; 339 width = 0; 340 prec = -1; 341 sign = '\0'; 342 343 rflag: ch = *fmt++; 344 reswitch: switch (ch) { 345 case ' ': 346 /* 347 * ``If the space and + flags both appear, the space 348 * flag will be ignored.'' 349 * -- ANSI X3J11 350 */ 351 if (!sign) 352 sign = ' '; 353 goto rflag; 354 case '#': 355 flags |= ALT; 356 goto rflag; 357 case '*': 358 /* 359 * ``A negative field width argument is taken as a 360 * - flag followed by a positive field width.'' 361 * -- ANSI X3J11 362 * They don't exclude field widths read from args. 363 */ 364 if ((width = va_arg(ap, int)) >= 0) 365 goto rflag; 366 width = -width; 367 /* FALLTHROUGH */ 368 case '-': 369 flags |= LADJUST; 370 goto rflag; 371 case '+': 372 sign = '+'; 373 goto rflag; 374 case '.': 375 if ((ch = *fmt++) == '*') { 376 n = va_arg(ap, int); 377 prec = n < 0 ? -1 : n; 378 goto rflag; 379 } 380 n = 0; 381 while (is_digit(ch)) { 382 n = 10 * n + to_digit(ch); 383 ch = *fmt++; 384 } 385 prec = n < 0 ? -1 : n; 386 goto reswitch; 387 case '0': 388 /* 389 * ``Note that 0 is taken as a flag, not as the 390 * beginning of a field width.'' 391 * -- ANSI X3J11 392 */ 393 flags |= ZEROPAD; 394 goto rflag; 395 case '1': case '2': case '3': case '4': 396 case '5': case '6': case '7': case '8': case '9': 397 n = 0; 398 do { 399 n = 10 * n + to_digit(ch); 400 ch = *fmt++; 401 } while (is_digit(ch)); 402 width = n; 403 goto reswitch; 404 #ifdef FLOATING_POINT 405 case 'L': 406 flags |= LONGDBL; 407 goto rflag; 408 #endif 409 case 'h': 410 flags |= SHORTINT; 411 goto rflag; 412 case 'l': 413 if (*fmt == 'l') { 414 fmt++; 415 flags |= QUADINT; 416 } else { 417 flags |= LONGINT; 418 } 419 goto rflag; 420 case 'q': 421 flags |= QUADINT; 422 goto rflag; 423 case 'c': 424 *buf = va_arg(ap, int); 425 cp = buf; 426 size = 1; 427 sign = '\0'; 428 break; 429 case 'D': 430 flags |= LONGINT; 431 /*FALLTHROUGH*/ 432 case 'd': 433 case 'i': 434 _uquad = SARG(); 435 if ((quad_t)_uquad < 0) { 436 _uquad = -_uquad; 437 sign = '-'; 438 } 439 base = DEC; 440 goto number; 441 #ifdef FLOATING_POINT 442 case 'e': 443 case 'E': 444 case 'f': 445 case 'g': 446 case 'G': 447 if (prec == -1) { 448 prec = DEFPREC; 449 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 450 prec = 1; 451 } 452 453 if (flags & LONGDBL) { 454 _double = (double) va_arg(ap, long double); 455 } else { 456 _double = va_arg(ap, double); 457 } 458 459 /* do this before tricky precision changes */ 460 if (isinf(_double)) { 461 if (_double < 0) 462 sign = '-'; 463 cp = "Inf"; 464 size = 3; 465 break; 466 } 467 if (isnan(_double)) { 468 cp = "NaN"; 469 size = 3; 470 break; 471 } 472 473 flags |= FPT; 474 cp = cvt(_double, prec, flags, &softsign, 475 &expt, ch, &ndig); 476 if (ch == 'g' || ch == 'G') { 477 if (expt <= -4 || expt > prec) 478 ch = (ch == 'g') ? 'e' : 'E'; 479 else 480 ch = 'g'; 481 } 482 if (ch <= 'e') { /* 'e' or 'E' fmt */ 483 --expt; 484 expsize = exponent(expstr, expt, ch); 485 size = expsize + ndig; 486 if (ndig > 1 || flags & ALT) 487 ++size; 488 } else if (ch == 'f') { /* f fmt */ 489 if (expt > 0) { 490 size = expt; 491 if (prec || flags & ALT) 492 size += prec + 1; 493 } else /* "0.X" */ 494 size = prec + 2; 495 } else if (expt >= ndig) { /* fixed g fmt */ 496 size = expt; 497 if (flags & ALT) 498 ++size; 499 } else 500 size = ndig + (expt > 0 ? 501 1 : 2 - expt); 502 503 if (softsign) 504 sign = '-'; 505 break; 506 #endif /* FLOATING_POINT */ 507 case 'n': 508 if (flags & QUADINT) 509 *va_arg(ap, quad_t *) = ret; 510 else if (flags & LONGINT) 511 *va_arg(ap, long *) = ret; 512 else if (flags & SHORTINT) 513 *va_arg(ap, short *) = ret; 514 else 515 *va_arg(ap, int *) = ret; 516 continue; /* no output */ 517 case 'O': 518 flags |= LONGINT; 519 /*FALLTHROUGH*/ 520 case 'o': 521 _uquad = UARG(); 522 base = OCT; 523 goto nosign; 524 case 'p': 525 /* 526 * ``The argument shall be a pointer to void. The 527 * value of the pointer is converted to a sequence 528 * of printable characters, in an implementation- 529 * defined manner.'' 530 * -- ANSI X3J11 531 */ 532 /* NOSTRICT */ 533 _uquad = (u_long)va_arg(ap, void *); 534 base = HEX; 535 xdigs = "0123456789abcdef"; 536 flags |= HEXPREFIX; 537 ch = 'x'; 538 goto nosign; 539 case 's': 540 if ((cp = va_arg(ap, char *)) == NULL) 541 cp = "(null)"; 542 if (prec >= 0) { 543 /* 544 * can't use strlen; can only look for the 545 * NUL in the first `prec' characters, and 546 * strlen() will go further. 547 */ 548 char *p = memchr(cp, 0, (size_t)prec); 549 550 if (p != NULL) { 551 size = p - cp; 552 if (size > prec) 553 size = prec; 554 } else 555 size = prec; 556 } else 557 size = strlen(cp); 558 sign = '\0'; 559 break; 560 case 'U': 561 flags |= LONGINT; 562 /*FALLTHROUGH*/ 563 case 'u': 564 _uquad = UARG(); 565 base = DEC; 566 goto nosign; 567 case 'X': 568 xdigs = "0123456789ABCDEF"; 569 goto hex; 570 case 'x': 571 xdigs = "0123456789abcdef"; 572 hex: _uquad = UARG(); 573 base = HEX; 574 /* leading 0x/X only if non-zero */ 575 if (flags & ALT && _uquad != 0) 576 flags |= HEXPREFIX; 577 578 /* unsigned conversions */ 579 nosign: sign = '\0'; 580 /* 581 * ``... diouXx conversions ... if a precision is 582 * specified, the 0 flag will be ignored.'' 583 * -- ANSI X3J11 584 */ 585 number: if ((dprec = prec) >= 0) 586 flags &= ~ZEROPAD; 587 588 /* 589 * ``The result of converting a zero value with an 590 * explicit precision of zero is no characters.'' 591 * -- ANSI X3J11 592 */ 593 bp = buf + BUF; 594 if (_uquad != 0 || prec != 0) { 595 /* 596 * Unsigned mod is hard, and unsigned mod 597 * by a constant is easier than that by 598 * a variable; hence this switch. 599 */ 600 switch (base) { 601 case OCT: 602 do { 603 *--bp = to_char(_uquad & 7); 604 _uquad >>= 3; 605 } while (_uquad); 606 /* handle octal leading 0 */ 607 if (flags & ALT && *bp != '0') 608 *--bp = '0'; 609 break; 610 611 case DEC: 612 /* many numbers are 1 digit */ 613 while (_uquad >= 10) { 614 *--bp = to_char(_uquad % 10); 615 _uquad /= 10; 616 } 617 *--bp = to_char(_uquad); 618 break; 619 620 case HEX: 621 do { 622 *--bp = xdigs[(size_t) 623 (_uquad & 15)]; 624 _uquad >>= 4; 625 } while (_uquad); 626 break; 627 628 default: 629 cp = "bug in vfprintf: bad base"; 630 size = strlen(cp); 631 goto skipsize; 632 } 633 } 634 cp = bp; 635 size = buf + BUF - bp; 636 skipsize: 637 break; 638 default: /* "%?" prints ?, unless ? is NUL */ 639 if (ch == '\0') 640 goto done; 641 /* pretend it was %c with argument ch */ 642 *buf = ch; 643 cp = buf; 644 size = 1; 645 sign = '\0'; 646 break; 647 } 648 649 /* 650 * All reasonable formats wind up here. At this point, `cp' 651 * points to a string which (if not flags&LADJUST) should be 652 * padded out to `width' places. If flags&ZEROPAD, it should 653 * first be prefixed by any sign or other prefix; otherwise, 654 * it should be blank padded before the prefix is emitted. 655 * After any left-hand padding and prefixing, emit zeroes 656 * required by a decimal [diouxX] precision, then print the 657 * string proper, then emit zeroes required by any leftover 658 * floating precision; finally, if LADJUST, pad with blanks. 659 * 660 * Compute actual size, so we know how much to pad. 661 * size excludes decimal prec; realsz includes it. 662 */ 663 realsz = dprec > size ? dprec : size; 664 if (sign) 665 realsz++; 666 else if (flags & HEXPREFIX) 667 realsz+= 2; 668 669 /* right-adjusting blank padding */ 670 if ((flags & (LADJUST|ZEROPAD)) == 0) 671 PAD(width - realsz, blanks); 672 673 /* prefix */ 674 if (sign) { 675 PRINT(&sign, 1); 676 } else if (flags & HEXPREFIX) { 677 ox[0] = '0'; 678 ox[1] = ch; 679 PRINT(ox, 2); 680 } 681 682 /* right-adjusting zero padding */ 683 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 684 PAD(width - realsz, zeroes); 685 686 /* leading zeroes from decimal precision */ 687 PAD(dprec - size, zeroes); 688 689 /* the string or number proper */ 690 #ifdef FLOATING_POINT 691 if ((flags & FPT) == 0) { 692 PRINT(cp, size); 693 } else { /* glue together f_p fragments */ 694 if (ch >= 'f') { /* 'f' or 'g' */ 695 if (_double == 0) { 696 /* kludge for __dtoa irregularity */ 697 PRINT("0", 1); 698 if (expt < ndig || (flags & ALT) != 0) { 699 PRINT(decimal_point, 1); 700 PAD(ndig - 1, zeroes); 701 } 702 } else if (expt <= 0) { 703 PRINT("0", 1); 704 PRINT(decimal_point, 1); 705 PAD(-expt, zeroes); 706 PRINT(cp, ndig); 707 } else if (expt >= ndig) { 708 PRINT(cp, ndig); 709 PAD(expt - ndig, zeroes); 710 if (flags & ALT) 711 PRINT(".", 1); 712 } else { 713 PRINT(cp, expt); 714 cp += expt; 715 PRINT(".", 1); 716 PRINT(cp, ndig-expt); 717 } 718 } else { /* 'e' or 'E' */ 719 if (ndig > 1 || flags & ALT) { 720 ox[0] = *cp++; 721 ox[1] = '.'; 722 PRINT(ox, 2); 723 if (_double) { 724 PRINT(cp, ndig-1); 725 } else /* 0.[0..] */ 726 /* __dtoa irregularity */ 727 PAD(ndig - 1, zeroes); 728 } else /* XeYYY */ 729 PRINT(cp, 1); 730 PRINT(expstr, expsize); 731 } 732 } 733 #else 734 PRINT(cp, size); 735 #endif 736 /* left-adjusting padding (always blank) */ 737 if (flags & LADJUST) 738 PAD(width - realsz, blanks); 739 740 /* finally, adjust ret */ 741 ret += width > realsz ? width : realsz; 742 743 FLUSH(); /* copy out the I/O vectors */ 744 } 745 done: 746 FLUSH(); 747 error: 748 if (__sferror(fp)) 749 ret = -1; 750 FUNLOCKFILE(fp); 751 return (ret); 752 } 753 754 #ifdef FLOATING_POINT 755 756 static char * 757 cvt(value, ndigits, flags, sign, decpt, ch, length) 758 double value; 759 int ndigits, flags, *decpt, ch, *length; 760 char *sign; 761 { 762 int mode, dsgn; 763 char *digits, *bp, *rve; 764 765 _DIAGASSERT(decpt != NULL); 766 _DIAGASSERT(length != NULL); 767 _DIAGASSERT(sign != NULL); 768 769 if (ch == 'f') { 770 mode = 3; /* ndigits after the decimal point */ 771 } else { 772 /* To obtain ndigits after the decimal point for the 'e' 773 * and 'E' formats, round to ndigits + 1 significant 774 * figures. 775 */ 776 if (ch == 'e' || ch == 'E') { 777 ndigits++; 778 } 779 mode = 2; /* ndigits significant digits */ 780 } 781 782 if (value < 0) { 783 value = -value; 784 *sign = '-'; 785 } else 786 *sign = '\000'; 787 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 788 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 789 bp = digits + ndigits; 790 if (ch == 'f') { 791 if (*digits == '0' && value) 792 *decpt = -ndigits + 1; 793 bp += *decpt; 794 } 795 if (value == 0) /* kludge for __dtoa irregularity */ 796 rve = bp; 797 while (rve < bp) 798 *rve++ = '0'; 799 } 800 *length = rve - digits; 801 return (digits); 802 } 803 804 static int 805 exponent(p0, exp, fmtch) 806 char *p0; 807 int exp, fmtch; 808 { 809 char *p, *t; 810 char expbuf[MAXEXP]; 811 812 _DIAGASSERT(p0 != NULL); 813 814 p = p0; 815 *p++ = fmtch; 816 if (exp < 0) { 817 exp = -exp; 818 *p++ = '-'; 819 } 820 else 821 *p++ = '+'; 822 t = expbuf + MAXEXP; 823 if (exp > 9) { 824 do { 825 *--t = to_char(exp % 10); 826 } while ((exp /= 10) > 9); 827 *--t = to_char(exp); 828 for (; t < expbuf + MAXEXP; *p++ = *t++); 829 } 830 else { 831 *p++ = '0'; 832 *p++ = to_char(exp); 833 } 834 return (p - p0); 835 } 836 #endif /* FLOATING_POINT */ 837
Indexes created Tue Sep 30 11:09:46 GMT 2025