printf-pos.c revision 13545
1/*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#if defined(LIBC_SCCS) && !defined(lint) 38static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93"; 39#endif /* LIBC_SCCS and not lint */ 40 41/* 42 * Actual printf innards. 43 * 44 * This code is large and complicated... 45 */ 46 47#include <sys/types.h> 48 49#include <limits.h> 50#include <stdio.h> 51#include <stdlib.h> 52#include <string.h> 53 54#if __STDC__ 55#include <stdarg.h> 56#else 57#include <varargs.h> 58#endif 59 60#include "local.h" 61#include "fvwrite.h" 62#ifdef _THREAD_SAFE 63#include <pthread.h> 64#include "pthread_private.h" 65#endif 66 67/* Define FLOATING_POINT to get floating point. */ 68#define FLOATING_POINT 69 70/* 71 * Flush out all the vectors defined by the given uio, 72 * then reset it so that it can be reused. 73 */ 74static int 75__sprint(fp, uio) 76 FILE *fp; 77 register struct __suio *uio; 78{ 79 register int err; 80 81 if (uio->uio_resid == 0) { 82 uio->uio_iovcnt = 0; 83 return (0); 84 } 85 err = __sfvwrite(fp, uio); 86 uio->uio_resid = 0; 87 uio->uio_iovcnt = 0; 88 return (err); 89} 90 91/* 92 * Helper function for `fprintf to unbuffered unix file': creates a 93 * temporary buffer. We only work on write-only files; this avoids 94 * worries about ungetc buffers and so forth. 95 */ 96static int 97__sbprintf(fp, fmt, ap) 98 register FILE *fp; 99 const char *fmt; 100 va_list ap; 101{ 102 int ret; 103 FILE fake; 104 unsigned char buf[BUFSIZ]; 105 106 /* copy the important variables */ 107 fake._flags = fp->_flags & ~__SNBF; 108 fake._file = fp->_file; 109 fake._cookie = fp->_cookie; 110 fake._write = fp->_write; 111 112 /* set up the buffer */ 113 fake._bf._base = fake._p = buf; 114 fake._bf._size = fake._w = sizeof(buf); 115 fake._lbfsize = 0; /* not actually used, but Just In Case */ 116 117 /* do the work, then copy any error status */ 118 ret = vfprintf(&fake, fmt, ap); 119 if (ret >= 0 && fflush(&fake)) 120 ret = EOF; 121 if (fake._flags & __SERR) 122 fp->_flags |= __SERR; 123 return (ret); 124} 125 126/* 127 * Macros for converting digits to letters and vice versa 128 */ 129#define to_digit(c) ((c) - '0') 130#define is_digit(c) ((unsigned)to_digit(c) <= 9) 131#define to_char(n) ((n) + '0') 132 133/* 134 * Convert an unsigned long to ASCII for printf purposes, returning 135 * a pointer to the first character of the string representation. 136 * Octal numbers can be forced to have a leading zero; hex numbers 137 * use the given digits. 138 */ 139static char * 140__ultoa(val, endp, base, octzero, xdigs) 141 register u_long val; 142 char *endp; 143 int base, octzero; 144 char *xdigs; 145{ 146 register char *cp = endp; 147 register long sval; 148 149 /* 150 * Handle the three cases separately, in the hope of getting 151 * better/faster code. 152 */ 153 switch (base) { 154 case 10: 155 if (val < 10) { /* many numbers are 1 digit */ 156 *--cp = to_char(val); 157 return (cp); 158 } 159 /* 160 * On many machines, unsigned arithmetic is harder than 161 * signed arithmetic, so we do at most one unsigned mod and 162 * divide; this is sufficient to reduce the range of 163 * the incoming value to where signed arithmetic works. 164 */ 165 if (val > LONG_MAX) { 166 *--cp = to_char(val % 10); 167 sval = val / 10; 168 } else 169 sval = val; 170 do { 171 *--cp = to_char(sval % 10); 172 sval /= 10; 173 } while (sval != 0); 174 break; 175 176 case 8: 177 do { 178 *--cp = to_char(val & 7); 179 val >>= 3; 180 } while (val); 181 if (octzero && *cp != '0') 182 *--cp = '0'; 183 break; 184 185 case 16: 186 do { 187 *--cp = xdigs[val & 15]; 188 val >>= 4; 189 } while (val); 190 break; 191 192 default: /* oops */ 193 abort(); 194 } 195 return (cp); 196} 197 198/* Identical to __ultoa, but for quads. */ 199static char * 200__uqtoa(val, endp, base, octzero, xdigs) 201 register u_quad_t val; 202 char *endp; 203 int base, octzero; 204 char *xdigs; 205{ 206 register char *cp = endp; 207 register quad_t sval; 208 209 /* quick test for small values; __ultoa is typically much faster */ 210 /* (perhaps instead we should run until small, then call __ultoa?) */ 211 if (val <= ULONG_MAX) 212 return (__ultoa((u_long)val, endp, base, octzero, xdigs)); 213 switch (base) { 214 case 10: 215 if (val < 10) { 216 *--cp = to_char(val % 10); 217 return (cp); 218 } 219 if (val > QUAD_MAX) { 220 *--cp = to_char(val % 10); 221 sval = val / 10; 222 } else 223 sval = val; 224 do { 225 *--cp = to_char(sval % 10); 226 sval /= 10; 227 } while (sval != 0); 228 break; 229 230 case 8: 231 do { 232 *--cp = to_char(val & 7); 233 val >>= 3; 234 } while (val); 235 if (octzero && *cp != '0') 236 *--cp = '0'; 237 break; 238 239 case 16: 240 do { 241 *--cp = xdigs[val & 15]; 242 val >>= 4; 243 } while (val); 244 break; 245 246 default: 247 abort(); 248 } 249 return (cp); 250} 251 252#ifdef FLOATING_POINT 253#include <math.h> 254#include "floatio.h" 255 256#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 257#define DEFPREC 6 258 259static char *cvt __P((double, int, int, char *, int *, int, int *)); 260static int exponent __P((char *, int, int)); 261 262#else /* no FLOATING_POINT */ 263 264#define BUF 68 265 266#endif /* FLOATING_POINT */ 267 268 269/* 270 * Flags used during conversion. 271 */ 272#define ALT 0x001 /* alternate form */ 273#define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 274#define LADJUST 0x004 /* left adjustment */ 275#define LONGDBL 0x008 /* long double; unimplemented */ 276#define LONGINT 0x010 /* long integer */ 277#define QUADINT 0x020 /* quad integer */ 278#define SHORTINT 0x040 /* short integer */ 279#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 280#define FPT 0x100 /* Floating point number */ 281int 282vfprintf(fp, fmt0, ap) 283 FILE *fp; 284 const char *fmt0; 285 va_list ap; 286{ 287 register char *fmt; /* format string */ 288 register int ch; /* character from fmt */ 289 register int n; /* handy integer (short term usage) */ 290 register char *cp; /* handy char pointer (short term usage) */ 291 register struct __siov *iovp;/* for PRINT macro */ 292 register int flags; /* flags as above */ 293 int ret; /* return value accumulator */ 294 int width; /* width from format (%8d), or 0 */ 295 int prec; /* precision from format (%.3d), or -1 */ 296 char sign; /* sign prefix (' ', '+', '-', or \0) */ 297#ifdef FLOATING_POINT 298 char softsign; /* temporary negative sign for floats */ 299 double _double; /* double precision arguments %[eEfgG] */ 300 int expt; /* integer value of exponent */ 301 int expsize; /* character count for expstr */ 302 int ndig; /* actual number of digits returned by cvt */ 303 char expstr[7]; /* buffer for exponent string */ 304#endif 305 u_long ulval; /* integer arguments %[diouxX] */ 306 u_quad_t uqval; /* %q integers */ 307 int base; /* base for [diouxX] conversion */ 308 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 309 int fieldsz; /* field size expanded by sign, etc */ 310 int realsz; /* field size expanded by dprec */ 311 int size; /* size of converted field or string */ 312 char *xdigs; /* digits for [xX] conversion */ 313#define NIOV 8 314 struct __suio uio; /* output information: summary */ 315 struct __siov iov[NIOV];/* ... and individual io vectors */ 316 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 317 char ox[2]; /* space for 0x hex-prefix */ 318 319 /* 320 * Choose PADSIZE to trade efficiency vs. size. If larger printf 321 * fields occur frequently, increase PADSIZE and make the initialisers 322 * below longer. 323 */ 324#define PADSIZE 16 /* pad chunk size */ 325 static char blanks[PADSIZE] = 326 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 327 static char zeroes[PADSIZE] = 328 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 329 330 /* 331 * BEWARE, these `goto error' on error, and PAD uses `n'. 332 */ 333#define PRINT(ptr, len) { \ 334 iovp->iov_base = (ptr); \ 335 iovp->iov_len = (len); \ 336 uio.uio_resid += (len); \ 337 iovp++; \ 338 if (++uio.uio_iovcnt >= NIOV) { \ 339 if (__sprint(fp, &uio)) \ 340 goto error; \ 341 iovp = iov; \ 342 } \ 343} 344#define PAD(howmany, with) { \ 345 if ((n = (howmany)) > 0) { \ 346 while (n > PADSIZE) { \ 347 PRINT(with, PADSIZE); \ 348 n -= PADSIZE; \ 349 } \ 350 PRINT(with, n); \ 351 } \ 352} 353#define FLUSH() { \ 354 if (uio.uio_resid && __sprint(fp, &uio)) \ 355 goto error; \ 356 uio.uio_iovcnt = 0; \ 357 iovp = iov; \ 358} 359 360 /* 361 * To extend shorts properly, we need both signed and unsigned 362 * argument extraction methods. 363 */ 364#define SARG() \ 365 (flags&LONGINT ? va_arg(ap, long) : \ 366 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 367 (long)va_arg(ap, int)) 368#define UARG() \ 369 (flags&LONGINT ? va_arg(ap, u_long) : \ 370 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 371 (u_long)va_arg(ap, u_int)) 372 373#ifdef _THREAD_SAFE 374 _thread_flockfile(fp,__FILE__,__LINE__); 375#endif 376 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 377 if (cantwrite(fp)) { 378#ifdef _THREAD_SAFE 379 _thread_funlockfile(fp); 380#endif 381 return (EOF); 382 } 383 384 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 385 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 386 fp->_file >= 0) { 387#ifdef _THREAD_SAFE 388 _thread_funlockfile(fp); 389#endif 390 return (__sbprintf(fp, fmt0, ap)); 391 } 392 393 fmt = (char *)fmt0; 394 uio.uio_iov = iovp = iov; 395 uio.uio_resid = 0; 396 uio.uio_iovcnt = 0; 397 ret = 0; 398 399 /* 400 * Scan the format for conversions (`%' character). 401 */ 402 for (;;) { 403 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 404 /* void */; 405 if ((n = fmt - cp) != 0) { 406 PRINT(cp, n); 407 ret += n; 408 } 409 if (ch == '\0') 410 goto done; 411 fmt++; /* skip over '%' */ 412 413 flags = 0; 414 dprec = 0; 415 width = 0; 416 prec = -1; 417 sign = '\0'; 418 419rflag: ch = *fmt++; 420reswitch: switch (ch) { 421 case ' ': 422 /* 423 * ``If the space and + flags both appear, the space 424 * flag will be ignored.'' 425 * -- ANSI X3J11 426 */ 427 if (!sign) 428 sign = ' '; 429 goto rflag; 430 case '#': 431 flags |= ALT; 432 goto rflag; 433 case '*': 434 /* 435 * ``A negative field width argument is taken as a 436 * - flag followed by a positive field width.'' 437 * -- ANSI X3J11 438 * They don't exclude field widths read from args. 439 */ 440 if ((width = va_arg(ap, int)) >= 0) 441 goto rflag; 442 width = -width; 443 /* FALLTHROUGH */ 444 case '-': 445 flags |= LADJUST; 446 goto rflag; 447 case '+': 448 sign = '+'; 449 goto rflag; 450 case '.': 451 if ((ch = *fmt++) == '*') { 452 n = va_arg(ap, int); 453 prec = n < 0 ? -1 : n; 454 goto rflag; 455 } 456 n = 0; 457 while (is_digit(ch)) { 458 n = 10 * n + to_digit(ch); 459 ch = *fmt++; 460 } 461 prec = n < 0 ? -1 : n; 462 goto reswitch; 463 case '0': 464 /* 465 * ``Note that 0 is taken as a flag, not as the 466 * beginning of a field width.'' 467 * -- ANSI X3J11 468 */ 469 flags |= ZEROPAD; 470 goto rflag; 471 case '1': case '2': case '3': case '4': 472 case '5': case '6': case '7': case '8': case '9': 473 n = 0; 474 do { 475 n = 10 * n + to_digit(ch); 476 ch = *fmt++; 477 } while (is_digit(ch)); 478 width = n; 479 goto reswitch; 480#ifdef FLOATING_POINT 481 case 'L': 482 flags |= LONGDBL; 483 goto rflag; 484#endif 485 case 'h': 486 flags |= SHORTINT; 487 goto rflag; 488 case 'l': 489 flags |= LONGINT; 490 goto rflag; 491 case 'q': 492 flags |= QUADINT; 493 goto rflag; 494 case 'c': 495 *(cp = buf) = va_arg(ap, int); 496 size = 1; 497 sign = '\0'; 498 break; 499 case 'D': 500 flags |= LONGINT; 501 /*FALLTHROUGH*/ 502 case 'd': 503 case 'i': 504 if (flags & QUADINT) { 505 uqval = va_arg(ap, quad_t); 506 if ((quad_t)uqval < 0) { 507 uqval = -uqval; 508 sign = '-'; 509 } 510 } else { 511 ulval = SARG(); 512 if ((long)ulval < 0) { 513 ulval = -ulval; 514 sign = '-'; 515 } 516 } 517 base = 10; 518 goto number; 519#ifdef FLOATING_POINT 520 case 'e': 521 case 'E': 522 case 'f': 523 goto fp_begin; 524 case 'g': 525 case 'G': 526 if (prec == 0) 527 prec = 1; 528fp_begin: if (prec == -1) 529 prec = DEFPREC; 530 if (flags & LONGDBL) 531 _double = (double)va_arg(ap, long double); 532 else 533 _double = va_arg(ap, double); 534 /* do this before tricky precision changes */ 535 if (isinf(_double)) { 536 if (_double < 0) 537 sign = '-'; 538 cp = "Inf"; 539 size = 3; 540 break; 541 } 542 if (isnan(_double)) { 543 cp = "NaN"; 544 size = 3; 545 break; 546 } 547 flags |= FPT; 548 cp = cvt(_double, prec, flags, &softsign, 549 &expt, ch, &ndig); 550 if (ch == 'g' || ch == 'G') { 551 if (expt <= -4 || expt > prec) 552 ch = (ch == 'g') ? 'e' : 'E'; 553 else 554 ch = 'g'; 555 } 556 if (ch <= 'e') { /* 'e' or 'E' fmt */ 557 --expt; 558 expsize = exponent(expstr, expt, ch); 559 size = expsize + ndig; 560 if (ndig > 1 || flags & ALT) 561 ++size; 562 } else if (ch == 'f') { /* f fmt */ 563 if (expt > 0) { 564 size = expt; 565 if (prec || flags & ALT) 566 size += prec + 1; 567 } else /* "0.X" */ 568 size = prec + 2; 569 } else if (expt >= ndig) { /* fixed g fmt */ 570 size = expt; 571 if (flags & ALT) 572 ++size; 573 } else 574 size = ndig + (expt > 0 ? 575 1 : 2 - expt); 576 577 if (softsign) 578 sign = '-'; 579 break; 580#endif /* FLOATING_POINT */ 581 case 'n': 582 if (flags & QUADINT) 583 *va_arg(ap, quad_t *) = ret; 584 else if (flags & LONGINT) 585 *va_arg(ap, long *) = ret; 586 else if (flags & SHORTINT) 587 *va_arg(ap, short *) = ret; 588 else 589 *va_arg(ap, int *) = ret; 590 continue; /* no output */ 591 case 'O': 592 flags |= LONGINT; 593 /*FALLTHROUGH*/ 594 case 'o': 595 if (flags & QUADINT) 596 uqval = va_arg(ap, u_quad_t); 597 else 598 ulval = UARG(); 599 base = 8; 600 goto nosign; 601 case 'p': 602 /* 603 * ``The argument shall be a pointer to void. The 604 * value of the pointer is converted to a sequence 605 * of printable characters, in an implementation- 606 * defined manner.'' 607 * -- ANSI X3J11 608 */ 609 ulval = (u_long)va_arg(ap, void *); 610 base = 16; 611 xdigs = "0123456789abcdef"; 612 flags = (flags & ~QUADINT) | HEXPREFIX; 613 ch = 'x'; 614 goto nosign; 615 case 's': 616 if ((cp = va_arg(ap, char *)) == NULL) 617 cp = "(null)"; 618 if (prec >= 0) { 619 /* 620 * can't use strlen; can only look for the 621 * NUL in the first `prec' characters, and 622 * strlen() will go further. 623 */ 624 char *p = memchr(cp, 0, prec); 625 626 if (p != NULL) { 627 size = p - cp; 628 if (size > prec) 629 size = prec; 630 } else 631 size = prec; 632 } else 633 size = strlen(cp); 634 sign = '\0'; 635 break; 636 case 'U': 637 flags |= LONGINT; 638 /*FALLTHROUGH*/ 639 case 'u': 640 if (flags & QUADINT) 641 uqval = va_arg(ap, u_quad_t); 642 else 643 ulval = UARG(); 644 base = 10; 645 goto nosign; 646 case 'X': 647 xdigs = "0123456789ABCDEF"; 648 goto hex; 649 case 'x': 650 xdigs = "0123456789abcdef"; 651hex: if (flags & QUADINT) 652 uqval = va_arg(ap, u_quad_t); 653 else 654 ulval = UARG(); 655 base = 16; 656 /* leading 0x/X only if non-zero */ 657 if (flags & ALT && 658 (flags & QUADINT ? uqval != 0 : ulval != 0)) 659 flags |= HEXPREFIX; 660 661 /* unsigned conversions */ 662nosign: sign = '\0'; 663 /* 664 * ``... diouXx conversions ... if a precision is 665 * specified, the 0 flag will be ignored.'' 666 * -- ANSI X3J11 667 */ 668number: if ((dprec = prec) >= 0) 669 flags &= ~ZEROPAD; 670 671 /* 672 * ``The result of converting a zero value with an 673 * explicit precision of zero is no characters.'' 674 * -- ANSI X3J11 675 */ 676 cp = buf + BUF; 677 if (flags & QUADINT) { 678 if (uqval != 0 || prec != 0) 679 cp = __uqtoa(uqval, cp, base, 680 flags & ALT, xdigs); 681 } else { 682 if (ulval != 0 || prec != 0) 683 cp = __ultoa(ulval, cp, base, 684 flags & ALT, xdigs); 685 } 686 size = buf + BUF - cp; 687 break; 688 default: /* "%?" prints ?, unless ? is NUL */ 689 if (ch == '\0') 690 goto done; 691 /* pretend it was %c with argument ch */ 692 cp = buf; 693 *cp = ch; 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 * fieldsz excludes decimal prec; realsz includes it. 712 */ 713 fieldsz = size; 714 if (sign) 715 fieldsz++; 716 else if (flags & HEXPREFIX) 717 fieldsz += 2; 718 realsz = dprec > fieldsz ? dprec : fieldsz; 719 720 /* right-adjusting blank padding */ 721 if ((flags & (LADJUST|ZEROPAD)) == 0) 722 PAD(width - realsz, blanks); 723 724 /* prefix */ 725 if (sign) { 726 PRINT(&sign, 1); 727 } else if (flags & HEXPREFIX) { 728 ox[0] = '0'; 729 ox[1] = ch; 730 PRINT(ox, 2); 731 } 732 733 /* right-adjusting zero padding */ 734 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 735 PAD(width - realsz, zeroes); 736 737 /* leading zeroes from decimal precision */ 738 PAD(dprec - fieldsz, zeroes); 739 740 /* the string or number proper */ 741#ifdef FLOATING_POINT 742 if ((flags & FPT) == 0) { 743 PRINT(cp, size); 744 } else { /* glue together f_p fragments */ 745 if (ch >= 'f') { /* 'f' or 'g' */ 746 if (_double == 0) { 747 /* kludge for __dtoa irregularity */ 748 if (expt >= ndig && 749 (flags & ALT) == 0) { 750 PRINT("0", 1); 751 } else { 752 PRINT("0.", 2); 753 PAD(ndig - 1, zeroes); 754 } 755 } else if (expt <= 0) { 756 PRINT("0.", 2); 757 PAD(-expt, zeroes); 758 PRINT(cp, ndig); 759 } else if (expt >= ndig) { 760 PRINT(cp, ndig); 761 PAD(expt - ndig, zeroes); 762 if (flags & ALT) 763 PRINT(".", 1); 764 } else { 765 PRINT(cp, expt); 766 cp += expt; 767 PRINT(".", 1); 768 PRINT(cp, ndig-expt); 769 } 770 } else { /* 'e' or 'E' */ 771 if (ndig > 1 || flags & ALT) { 772 ox[0] = *cp++; 773 ox[1] = '.'; 774 PRINT(ox, 2); 775 if (_double) { 776 PRINT(cp, ndig-1); 777 } else /* 0.[0..] */ 778 /* __dtoa irregularity */ 779 PAD(ndig - 1, zeroes); 780 } else /* XeYYY */ 781 PRINT(cp, 1); 782 PRINT(expstr, expsize); 783 } 784 } 785#else 786 PRINT(cp, size); 787#endif 788 /* left-adjusting padding (always blank) */ 789 if (flags & LADJUST) 790 PAD(width - realsz, blanks); 791 792 /* finally, adjust ret */ 793 ret += width > realsz ? width : realsz; 794 795 FLUSH(); /* copy out the I/O vectors */ 796 } 797done: 798 FLUSH(); 799error: 800 if (__sferror(fp)) 801 ret = EOF; 802#ifdef _THREAD_SAFE 803 _thread_funlockfile(fp); 804#endif 805 return (ret); 806 /* NOTREACHED */ 807} 808 809#ifdef FLOATING_POINT 810 811extern char *__dtoa __P((double, int, int, int *, int *, char **)); 812 813static char * 814cvt(value, ndigits, flags, sign, decpt, ch, length) 815 double value; 816 int ndigits, flags, *decpt, ch, *length; 817 char *sign; 818{ 819 int mode, dsgn; 820 char *digits, *bp, *rve; 821 822 if (ch == 'f') 823 mode = 3; /* ndigits after the decimal point */ 824 else { 825 /* 826 * To obtain ndigits after the decimal point for the 'e' 827 * and 'E' formats, round to ndigits + 1 significant 828 * figures. 829 */ 830 if (ch == 'e' || ch == 'E') 831 ndigits++; 832 mode = 2; /* ndigits significant digits */ 833 } 834 if (value < 0) { 835 value = -value; 836 *sign = '-'; 837 } else 838 *sign = '\000'; 839 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 840 if ((ch != 'g' && ch != 'G') || flags & ALT) { 841 /* 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 857static int 858exponent(p0, exp, fmtch) 859 char *p0; 860 int exp, fmtch; 861{ 862 register char *p, *t; 863 char expbuf[MAXEXP]; 864 865 p = p0; 866 *p++ = fmtch; 867 if (exp < 0) { 868 exp = -exp; 869 *p++ = '-'; 870 } 871 else 872 *p++ = '+'; 873 t = expbuf + MAXEXP; 874 if (exp > 9) { 875 do { 876 *--t = to_char(exp % 10); 877 } while ((exp /= 10) > 9); 878 *--t = to_char(exp); 879 for (; t < expbuf + MAXEXP; *p++ = *t++); 880 } 881 else { 882 *p++ = '0'; 883 *p++ = to_char(exp); 884 } 885 return (p - p0); 886} 887#endif /* FLOATING_POINT */ 888