1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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 = "from: @(#)vfprintf.c 5.50 (Berkeley) 12/16/92";*/ 39 static char *rcsid = "$Id: vfprintf.c,v 1.13 1994/10/20 03:56:56 jtc Exp $"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 /* 43 * Actual printf innards. 44 * 45 * This code is large and complicated... 46 */ 47 48 #include <sys/types.h> 49 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 /* 64 * Flush out all the vectors defined by the given uio, 65 * then reset it so that it can be reused. 66 */ 67 static int 68 __sprint(fp, uio) 69 FILE *fp; 70 register struct __suio *uio; 71 { 72 register int err; 73 74 if (uio->uio_resid == 0) { 75 uio->uio_iovcnt = 0; 76 return (0); 77 } 78 err = __sfvwrite(fp, uio); 79 uio->uio_resid = 0; 80 uio->uio_iovcnt = 0; 81 return (err); 82 } 83 84 /* 85 * Helper function for `fprintf to unbuffered unix file': creates a 86 * temporary buffer. We only work on write-only files; this avoids 87 * worries about ungetc buffers and so forth. 88 */ 89 static int 90 __sbprintf(fp, fmt, ap) 91 register FILE *fp; 92 const char *fmt; 93 va_list ap; 94 { 95 int ret; 96 FILE fake; 97 unsigned char buf[BUFSIZ]; 98 99 /* copy the important variables */ 100 fake._flags = fp->_flags & ~__SNBF; 101 fake._file = fp->_file; 102 fake._cookie = fp->_cookie; 103 fake._write = fp->_write; 104 105 /* set up the buffer */ 106 fake._bf._base = fake._p = buf; 107 fake._bf._size = fake._w = sizeof(buf); 108 fake._lbfsize = 0; /* not actually used, but Just In Case */ 109 110 /* do the work, then copy any error status */ 111 ret = vfprintf(&fake, fmt, ap); 112 if (ret >= 0 && fflush(&fake)) 113 ret = EOF; 114 if (fake._flags & __SERR) 115 fp->_flags |= __SERR; 116 return (ret); 117 } 118 119 120 #ifdef FLOATING_POINT 121 #include <locale.h> 122 #include <math.h> 123 #include "floatio.h" 124 125 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 126 #define DEFPREC 6 127 128 static char *cvt __P((double, int, int, char *, int *, int, int *)); 129 static int exponent __P((char *, int, int)); 130 131 #else /* no FLOATING_POINT */ 132 133 #define BUF 40 134 135 #endif /* FLOATING_POINT */ 136 137 138 /* 139 * Macros for converting digits to letters and vice versa 140 */ 141 #define to_digit(c) ((c) - '0') 142 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 143 #define to_char(n) ((n) + '0') 144 145 /* 146 * Flags used during conversion. 147 */ 148 #define ALT 0x001 /* alternate form */ 149 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 150 #define LADJUST 0x004 /* left adjustment */ 151 #define LONGDBL 0x008 /* long double; unimplemented */ 152 #define LONGINT 0x010 /* long integer */ 153 #define QUADINT 0x020 /* quad integer */ 154 #define SHORTINT 0x040 /* short integer */ 155 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 156 #define FPT 0x100 /* Floating point number */ 157 int 158 vfprintf(fp, fmt0, ap) 159 FILE *fp; 160 const char *fmt0; 161 _BSD_VA_LIST_ ap; 162 { 163 register char *fmt; /* format string */ 164 register int ch; /* character from fmt */ 165 register int n; /* handy integer (short term usage) */ 166 register char *cp; /* handy char pointer (short term usage) */ 167 register struct __siov *iovp;/* for PRINT macro */ 168 register int flags; /* flags as above */ 169 int ret; /* return value accumulator */ 170 int width; /* width from format (%8d), or 0 */ 171 int prec; /* precision from format (%.3d), or -1 */ 172 char sign; /* sign prefix (' ', '+', '-', or \0) */ 173 #ifdef FLOATING_POINT 174 char *decimal_point = localeconv()->decimal_point; 175 char softsign; /* temporary negative sign for floats */ 176 double _double; /* double precision arguments %[eEfgG] */ 177 int expt; /* integer value of exponent */ 178 int expsize; /* character count for expstr */ 179 int ndig; /* actual number of digits returned by cvt */ 180 char expstr[7]; /* buffer for exponent string */ 181 #endif 182 183 #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ 184 #define quad_t long long 185 #define u_quad_t unsigned long long 186 #endif 187 188 u_quad_t _uquad; /* integer arguments %[diouxX] */ 189 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 190 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 191 int fieldsz; /* field size expanded by sign, etc */ 192 int realsz; /* field size expanded by dprec */ 193 int size; /* size of converted field or string */ 194 char *xdigs; /* digits for [xX] conversion */ 195 #define NIOV 8 196 struct __suio uio; /* output information: summary */ 197 struct __siov iov[NIOV];/* ... and individual io vectors */ 198 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 199 char ox[2]; /* space for 0x hex-prefix */ 200 201 /* 202 * Choose PADSIZE to trade efficiency vs. size. If larger printf 203 * fields occur frequently, increase PADSIZE and make the initialisers 204 * below longer. 205 */ 206 #define PADSIZE 16 /* pad chunk size */ 207 static char blanks[PADSIZE] = 208 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 209 static char zeroes[PADSIZE] = 210 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 211 212 /* 213 * BEWARE, these `goto error' on error, and PAD uses `n'. 214 */ 215 #define PRINT(ptr, len) { \ 216 iovp->iov_base = (ptr); \ 217 iovp->iov_len = (len); \ 218 uio.uio_resid += (len); \ 219 iovp++; \ 220 if (++uio.uio_iovcnt >= NIOV) { \ 221 if (__sprint(fp, &uio)) \ 222 goto error; \ 223 iovp = iov; \ 224 } \ 225 } 226 #define PAD(howmany, with) { \ 227 if ((n = (howmany)) > 0) { \ 228 while (n > PADSIZE) { \ 229 PRINT(with, PADSIZE); \ 230 n -= PADSIZE; \ 231 } \ 232 PRINT(with, n); \ 233 } \ 234 } 235 #define FLUSH() { \ 236 if (uio.uio_resid && __sprint(fp, &uio)) \ 237 goto error; \ 238 uio.uio_iovcnt = 0; \ 239 iovp = iov; \ 240 } 241 242 /* 243 * To extend shorts properly, we need both signed and unsigned 244 * argument extraction methods. 245 */ 246 #define SARG() \ 247 (flags&QUADINT ? va_arg(ap, quad_t) : \ 248 flags&LONGINT ? va_arg(ap, long) : \ 249 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 250 (long)va_arg(ap, int)) 251 #define UARG() \ 252 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 253 flags&LONGINT ? va_arg(ap, u_long) : \ 254 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 255 (u_long)va_arg(ap, u_int)) 256 257 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 258 if (cantwrite(fp)) 259 return (EOF); 260 261 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 262 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 263 fp->_file >= 0) 264 return (__sbprintf(fp, fmt0, ap)); 265 266 fmt = (char *)fmt0; 267 uio.uio_iov = iovp = iov; 268 uio.uio_resid = 0; 269 uio.uio_iovcnt = 0; 270 ret = 0; 271 272 /* 273 * Scan the format for conversions (`%' character). 274 */ 275 for (;;) { 276 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 277 /* void */; 278 if ((n = fmt - cp) != 0) { 279 PRINT(cp, n); 280 ret += n; 281 } 282 if (ch == '\0') 283 goto done; 284 fmt++; /* skip over '%' */ 285 286 flags = 0; 287 dprec = 0; 288 width = 0; 289 prec = -1; 290 sign = '\0'; 291 292 rflag: ch = *fmt++; 293 reswitch: switch (ch) { 294 case ' ': 295 /* 296 * ``If the space and + flags both appear, the space 297 * flag will be ignored.'' 298 * -- ANSI X3J11 299 */ 300 if (!sign) 301 sign = ' '; 302 goto rflag; 303 case '#': 304 flags |= ALT; 305 goto rflag; 306 case '*': 307 /* 308 * ``A negative field width argument is taken as a 309 * - flag followed by a positive field width.'' 310 * -- ANSI X3J11 311 * They don't exclude field widths read from args. 312 */ 313 if ((width = va_arg(ap, int)) >= 0) 314 goto rflag; 315 width = -width; 316 /* FALLTHROUGH */ 317 case '-': 318 flags |= LADJUST; 319 goto rflag; 320 case '+': 321 sign = '+'; 322 goto rflag; 323 case '.': 324 if ((ch = *fmt++) == '*') { 325 n = va_arg(ap, int); 326 prec = n < 0 ? -1 : n; 327 goto rflag; 328 } 329 n = 0; 330 while (is_digit(ch)) { 331 n = 10 * n + to_digit(ch); 332 ch = *fmt++; 333 } 334 prec = n < 0 ? -1 : n; 335 goto reswitch; 336 case '0': 337 /* 338 * ``Note that 0 is taken as a flag, not as the 339 * beginning of a field width.'' 340 * -- ANSI X3J11 341 */ 342 flags |= ZEROPAD; 343 goto rflag; 344 case '1': case '2': case '3': case '4': 345 case '5': case '6': case '7': case '8': case '9': 346 n = 0; 347 do { 348 n = 10 * n + to_digit(ch); 349 ch = *fmt++; 350 } while (is_digit(ch)); 351 width = n; 352 goto reswitch; 353 #ifdef FLOATING_POINT 354 case 'L': 355 flags |= LONGDBL; 356 goto rflag; 357 #endif 358 case 'h': 359 flags |= SHORTINT; 360 goto rflag; 361 case 'l': 362 flags |= LONGINT; 363 goto rflag; 364 case 'q': 365 flags |= QUADINT; 366 goto rflag; 367 case 'c': 368 *(cp = buf) = va_arg(ap, int); 369 size = 1; 370 sign = '\0'; 371 break; 372 case 'D': 373 flags |= LONGINT; 374 /*FALLTHROUGH*/ 375 case 'd': 376 case 'i': 377 _uquad = SARG(); 378 if ((quad_t)_uquad < 0) { 379 _uquad = -_uquad; 380 sign = '-'; 381 } 382 base = DEC; 383 goto number; 384 #ifdef FLOATING_POINT 385 case 'e': 386 case 'E': 387 case 'f': 388 case 'g': 389 case 'G': 390 if (prec == -1) { 391 prec = DEFPREC; 392 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 393 prec = 1; 394 } 395 396 if (flags & LONGDBL) { 397 _double = (double) va_arg(ap, long double); 398 } else { 399 _double = va_arg(ap, double); 400 } 401 402 /* do this before tricky precision changes */ 403 if (isinf(_double)) { 404 if (_double < 0) 405 sign = '-'; 406 cp = "Inf"; 407 size = 3; 408 break; 409 } 410 if (isnan(_double)) { 411 cp = "NaN"; 412 size = 3; 413 break; 414 } 415 416 flags |= FPT; 417 cp = cvt(_double, prec, flags, &softsign, 418 &expt, ch, &ndig); 419 if (ch == 'g' || ch == 'G') { 420 if (expt <= -4 || expt > prec) 421 ch = (ch == 'g') ? 'e' : 'E'; 422 else 423 ch = 'g'; 424 } 425 if (ch <= 'e') { /* 'e' or 'E' fmt */ 426 --expt; 427 expsize = exponent(expstr, expt, ch); 428 size = expsize + ndig; 429 if (ndig > 1 || flags & ALT) 430 ++size; 431 } else if (ch == 'f') { /* f fmt */ 432 if (expt > 0) { 433 size = expt; 434 if (prec || flags & ALT) 435 size += prec + 1; 436 } else /* "0.X" */ 437 size = prec + 2; 438 } else if (expt >= ndig) { /* fixed g fmt */ 439 size = expt; 440 if (flags & ALT) 441 ++size; 442 } else 443 size = ndig + (expt > 0 ? 444 1 : 2 - expt); 445 446 if (softsign) 447 sign = '-'; 448 break; 449 #endif /* FLOATING_POINT */ 450 case 'n': 451 if (flags & QUADINT) 452 *va_arg(ap, quad_t *) = ret; 453 else if (flags & LONGINT) 454 *va_arg(ap, long *) = ret; 455 else if (flags & SHORTINT) 456 *va_arg(ap, short *) = ret; 457 else 458 *va_arg(ap, int *) = ret; 459 continue; /* no output */ 460 case 'O': 461 flags |= LONGINT; 462 /*FALLTHROUGH*/ 463 case 'o': 464 _uquad = UARG(); 465 base = OCT; 466 goto nosign; 467 case 'p': 468 /* 469 * ``The argument shall be a pointer to void. The 470 * value of the pointer is converted to a sequence 471 * of printable characters, in an implementation- 472 * defined manner.'' 473 * -- ANSI X3J11 474 */ 475 /* NOSTRICT */ 476 _uquad = (u_quad_t)va_arg(ap, void *); 477 base = HEX; 478 xdigs = "0123456789abcdef"; 479 flags |= HEXPREFIX; 480 ch = 'x'; 481 goto nosign; 482 case 's': 483 if ((cp = va_arg(ap, char *)) == NULL) 484 cp = "(null)"; 485 if (prec >= 0) { 486 /* 487 * can't use strlen; can only look for the 488 * NUL in the first `prec' characters, and 489 * strlen() will go further. 490 */ 491 char *p = memchr(cp, 0, prec); 492 493 if (p != NULL) { 494 size = p - cp; 495 if (size > prec) 496 size = prec; 497 } else 498 size = prec; 499 } else 500 size = strlen(cp); 501 sign = '\0'; 502 break; 503 case 'U': 504 flags |= LONGINT; 505 /*FALLTHROUGH*/ 506 case 'u': 507 _uquad = UARG(); 508 base = DEC; 509 goto nosign; 510 case 'X': 511 xdigs = "0123456789ABCDEF"; 512 goto hex; 513 case 'x': 514 xdigs = "0123456789abcdef"; 515 hex: _uquad = UARG(); 516 base = HEX; 517 /* leading 0x/X only if non-zero */ 518 if (flags & ALT && _uquad != 0) 519 flags |= HEXPREFIX; 520 521 /* unsigned conversions */ 522 nosign: sign = '\0'; 523 /* 524 * ``... diouXx conversions ... if a precision is 525 * specified, the 0 flag will be ignored.'' 526 * -- ANSI X3J11 527 */ 528 number: if ((dprec = prec) >= 0) 529 flags &= ~ZEROPAD; 530 531 /* 532 * ``The result of converting a zero value with an 533 * explicit precision of zero is no characters.'' 534 * -- ANSI X3J11 535 */ 536 cp = buf + BUF; 537 if (_uquad != 0 || prec != 0) { 538 /* 539 * Unsigned mod is hard, and unsigned mod 540 * by a constant is easier than that by 541 * a variable; hence this switch. 542 */ 543 switch (base) { 544 case OCT: 545 do { 546 *--cp = to_char(_uquad & 7); 547 _uquad >>= 3; 548 } while (_uquad); 549 /* handle octal leading 0 */ 550 if (flags & ALT && *cp != '0') 551 *--cp = '0'; 552 break; 553 554 case DEC: 555 /* many numbers are 1 digit */ 556 while (_uquad >= 10) { 557 *--cp = to_char(_uquad % 10); 558 _uquad /= 10; 559 } 560 *--cp = to_char(_uquad); 561 break; 562 563 case HEX: 564 do { 565 *--cp = xdigs[_uquad & 15]; 566 _uquad >>= 4; 567 } while (_uquad); 568 break; 569 570 default: 571 cp = "bug in vfprintf: bad base"; 572 size = strlen(cp); 573 goto skipsize; 574 } 575 } 576 size = buf + BUF - cp; 577 skipsize: 578 break; 579 default: /* "%?" prints ?, unless ? is NUL */ 580 if (ch == '\0') 581 goto done; 582 /* pretend it was %c with argument ch */ 583 cp = buf; 584 *cp = ch; 585 size = 1; 586 sign = '\0'; 587 break; 588 } 589 590 /* 591 * All reasonable formats wind up here. At this point, `cp' 592 * points to a string which (if not flags&LADJUST) should be 593 * padded out to `width' places. If flags&ZEROPAD, it should 594 * first be prefixed by any sign or other prefix; otherwise, 595 * it should be blank padded before the prefix is emitted. 596 * After any left-hand padding and prefixing, emit zeroes 597 * required by a decimal [diouxX] precision, then print the 598 * string proper, then emit zeroes required by any leftover 599 * floating precision; finally, if LADJUST, pad with blanks. 600 * 601 * Compute actual size, so we know how much to pad. 602 * fieldsz excludes decimal prec; realsz includes it. 603 */ 604 fieldsz = size; 605 if (sign) 606 fieldsz++; 607 else if (flags & HEXPREFIX) 608 fieldsz += 2; 609 realsz = dprec > fieldsz ? dprec : fieldsz; 610 611 /* right-adjusting blank padding */ 612 if ((flags & (LADJUST|ZEROPAD)) == 0) 613 PAD(width - realsz, blanks); 614 615 /* prefix */ 616 if (sign) { 617 PRINT(&sign, 1); 618 } else if (flags & HEXPREFIX) { 619 ox[0] = '0'; 620 ox[1] = ch; 621 PRINT(ox, 2); 622 } 623 624 /* right-adjusting zero padding */ 625 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 626 PAD(width - realsz, zeroes); 627 628 /* leading zeroes from decimal precision */ 629 PAD(dprec - size, zeroes); 630 631 /* the string or number proper */ 632 #ifdef FLOATING_POINT 633 if ((flags & FPT) == 0) { 634 PRINT(cp, size); 635 } else { /* glue together f_p fragments */ 636 if (ch >= 'f') { /* 'f' or 'g' */ 637 if (_double == 0) { 638 /* kludge for __dtoa irregularity */ 639 PRINT("0", 1); 640 if (expt < ndig || (flags & ALT) != 0) { 641 PRINT(decimal_point, 1); 642 PAD(ndig - 1, zeroes); 643 } 644 } else if (expt <= 0) { 645 PRINT("0", 1); 646 PRINT(decimal_point, 1); 647 PAD(-expt, zeroes); 648 PRINT(cp, ndig); 649 } else if (expt >= ndig) { 650 PRINT(cp, ndig); 651 PAD(expt - ndig, zeroes); 652 if (flags & ALT) 653 PRINT(".", 1); 654 } else { 655 PRINT(cp, expt); 656 cp += expt; 657 PRINT(".", 1); 658 PRINT(cp, ndig-expt); 659 } 660 } else { /* 'e' or 'E' */ 661 if (ndig > 1 || flags & ALT) { 662 ox[0] = *cp++; 663 ox[1] = '.'; 664 PRINT(ox, 2); 665 if (_double || flags & ALT == 0) { 666 PRINT(cp, ndig-1); 667 } else /* 0.[0..] */ 668 /* __dtoa irregularity */ 669 PAD(ndig - 1, zeroes); 670 } else /* XeYYY */ 671 PRINT(cp, 1); 672 PRINT(expstr, expsize); 673 } 674 } 675 #else 676 PRINT(cp, size); 677 #endif 678 /* left-adjusting padding (always blank) */ 679 if (flags & LADJUST) 680 PAD(width - realsz, blanks); 681 682 /* finally, adjust ret */ 683 ret += width > realsz ? width : realsz; 684 685 FLUSH(); /* copy out the I/O vectors */ 686 } 687 done: 688 FLUSH(); 689 error: 690 return (__sferror(fp) ? EOF : ret); 691 /* NOTREACHED */ 692 } 693 694 #ifdef FLOATING_POINT 695 696 extern char *__dtoa __P((double, int, int, int *, int *, char **)); 697 698 static char * 699 cvt(value, ndigits, flags, sign, decpt, ch, length) 700 double value; 701 int ndigits, flags, *decpt, ch, *length; 702 char *sign; 703 { 704 int mode, dsgn; 705 char *digits, *bp, *rve; 706 707 if (ch == 'f') { 708 mode = 3; /* ndigits after the decimal point */ 709 } else { 710 /* To obtain ndigits after the decimal point for the 'e' 711 * and 'E' formats, round to ndigits + 1 significant 712 * figures. 713 */ 714 if (ch == 'e' || ch == 'E') { 715 ndigits++; 716 } 717 mode = 2; /* ndigits significant digits */ 718 } 719 720 if (value < 0) { 721 value = -value; 722 *sign = '-'; 723 } else 724 *sign = '\000'; 725 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 726 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 727 bp = digits + ndigits; 728 if (ch == 'f') { 729 if (*digits == '0' && value) 730 *decpt = -ndigits + 1; 731 bp += *decpt; 732 } 733 if (value == 0) /* kludge for __dtoa irregularity */ 734 rve = bp; 735 while (rve < bp) 736 *rve++ = '0'; 737 } 738 *length = rve - digits; 739 return (digits); 740 } 741 742 static int 743 exponent(p0, exp, fmtch) 744 char *p0; 745 int exp, fmtch; 746 { 747 register char *p, *t; 748 char expbuf[MAXEXP]; 749 750 p = p0; 751 *p++ = fmtch; 752 if (exp < 0) { 753 exp = -exp; 754 *p++ = '-'; 755 } 756 else 757 *p++ = '+'; 758 t = expbuf + MAXEXP; 759 if (exp > 9) { 760 do { 761 *--t = to_char(exp % 10); 762 } while ((exp /= 10) > 9); 763 *--t = to_char(exp); 764 for (; t < expbuf + MAXEXP; *p++ = *t++); 765 } 766 else { 767 *p++ = '0'; 768 *p++ = to_char(exp); 769 } 770 return (p - p0); 771 } 772 #endif /* FLOATING_POINT */ 773