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