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 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * Actual printf innards. 45 * 46 * This code is large and complicated... 47 */ 48 49 #include "namespace.h" 50 #include <sys/types.h> 51 52 #include <ctype.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <stddef.h> 56 #include <stdint.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 61 #include <stdarg.h> 62 #include "un-namespace.h" 63 64 #include "libc_private.h" 65 #include "local.h" 66 #include "fvwrite.h" 67 68 /* Define FLOATING_POINT to get floating point. */ 69 #define FLOATING_POINT 70 71 union arg { 72 int intarg; 73 u_int uintarg; 74 long longarg; 75 u_long ulongarg; 76 long long longlongarg; 77 unsigned long long ulonglongarg; 78 ptrdiff_t ptrdiffarg; 79 size_t sizearg; 80 intmax_t intmaxarg; 81 uintmax_t uintmaxarg; 82 void *pvoidarg; 83 char *pchararg; 84 signed char *pschararg; 85 short *pshortarg; 86 int *pintarg; 87 long *plongarg; 88 long long *plonglongarg; 89 ptrdiff_t *pptrdiffarg; 90 size_t *psizearg; 91 intmax_t *pintmaxarg; 92 #ifdef FLOATING_POINT 93 double doublearg; 94 long double longdoublearg; 95 #endif 96 }; 97 98 /* 99 * Type ids for argument type table. 100 */ 101 enum typeid { 102 T_UNUSED, TP_SHORT, T_INT, T_U_INT, TP_INT, 103 T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG, 104 T_PTRDIFFT, TP_PTRDIFFT, T_SIZET, TP_SIZET, 105 T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR, 106 T_DOUBLE, T_LONG_DOUBLE 107 }; 108 109 static int __sprint(FILE *, struct __suio *); 110 static int __sbprintf(FILE *, const char *, va_list) __printflike(2, 0); 111 static char *__ujtoa(uintmax_t, char *, int, int, char *, int, char, 112 const char *); 113 static char *__ultoa(u_long, char *, int, int, char *, int, char, 114 const char *); 115 static void __find_arguments(const char *, va_list, union arg **); 116 static void __grow_type_table(int, enum typeid **, int *); 117 118 /* 119 * Flush out all the vectors defined by the given uio, 120 * then reset it so that it can be reused. 121 */ 122 static int 123 __sprint(FILE *fp, struct __suio *uio) 124 { 125 int err; 126 127 if (uio->uio_resid == 0) { 128 uio->uio_iovcnt = 0; 129 return (0); 130 } 131 err = __sfvwrite(fp, uio); 132 uio->uio_resid = 0; 133 uio->uio_iovcnt = 0; 134 return (err); 135 } 136 137 /* 138 * Helper function for `fprintf to unbuffered unix file': creates a 139 * temporary buffer. We only work on write-only files; this avoids 140 * worries about ungetc buffers and so forth. 141 */ 142 static int 143 __sbprintf(FILE *fp, const char *fmt, va_list ap) 144 { 145 int ret; 146 FILE fake; 147 unsigned char buf[BUFSIZ]; 148 149 /* copy the important variables */ 150 fake._flags = fp->_flags & ~__SNBF; 151 fake._file = fp->_file; 152 fake._cookie = fp->_cookie; 153 fake._write = fp->_write; 154 fake._extra = fp->_extra; 155 156 /* set up the buffer */ 157 fake._bf._base = fake._p = buf; 158 fake._bf._size = fake._w = sizeof(buf); 159 fake._lbfsize = 0; /* not actually used, but Just In Case */ 160 161 /* do the work, then copy any error status */ 162 ret = __vfprintf(&fake, fmt, ap); 163 if (ret >= 0 && __fflush(&fake)) 164 ret = EOF; 165 if (fake._flags & __SERR) 166 fp->_flags |= __SERR; 167 return (ret); 168 } 169 170 /* 171 * Macros for converting digits to letters and vice versa 172 */ 173 #define to_digit(c) ((c) - '0') 174 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 175 #define to_char(n) ((n) + '0') 176 177 /* 178 * Convert an unsigned long to ASCII for printf purposes, returning 179 * a pointer to the first character of the string representation. 180 * Octal numbers can be forced to have a leading zero; hex numbers 181 * use the given digits. 182 */ 183 static char * 184 __ultoa(u_long val, char *endp, int base, int octzero, char *xdigs, 185 int needgrp, char thousep, const char *grp) 186 { 187 char *cp = endp; 188 long sval; 189 int ndig; 190 191 /* 192 * Handle the three cases separately, in the hope of getting 193 * better/faster code. 194 */ 195 switch (base) { 196 case 10: 197 if (val < 10) { /* many numbers are 1 digit */ 198 *--cp = to_char(val); 199 return (cp); 200 } 201 ndig = 0; 202 /* 203 * On many machines, unsigned arithmetic is harder than 204 * signed arithmetic, so we do at most one unsigned mod and 205 * divide; this is sufficient to reduce the range of 206 * the incoming value to where signed arithmetic works. 207 */ 208 if (val > LONG_MAX) { 209 *--cp = to_char(val % 10); 210 ndig++; 211 sval = val / 10; 212 } else 213 sval = val; 214 do { 215 *--cp = to_char(sval % 10); 216 ndig++; 217 /* 218 * If (*grp == CHAR_MAX) then no more grouping 219 * should be performed. 220 */ 221 if (needgrp && ndig == *grp && *grp != CHAR_MAX 222 && sval > 9) { 223 *--cp = thousep; 224 ndig = 0; 225 /* 226 * If (*(grp+1) == '\0') then we have to 227 * use *grp character (last grouping rule) 228 * for all next cases 229 */ 230 if (*(grp+1) != '\0') 231 grp++; 232 } 233 sval /= 10; 234 } while (sval != 0); 235 break; 236 237 case 8: 238 do { 239 *--cp = to_char(val & 7); 240 val >>= 3; 241 } while (val); 242 if (octzero && *cp != '0') 243 *--cp = '0'; 244 break; 245 246 case 16: 247 do { 248 *--cp = xdigs[val & 15]; 249 val >>= 4; 250 } while (val); 251 break; 252 253 default: /* oops */ 254 abort(); 255 } 256 return (cp); 257 } 258 259 /* Identical to __ultoa, but for intmax_t. */ 260 static char * 261 __ujtoa(uintmax_t val, char *endp, int base, int octzero, char *xdigs, 262 int needgrp, char thousep, const char *grp) 263 { 264 char *cp = endp; 265 intmax_t sval; 266 int ndig; 267 268 /* quick test for small values; __ultoa is typically much faster */ 269 /* (perhaps instead we should run until small, then call __ultoa?) */ 270 if (val <= ULONG_MAX) 271 return (__ultoa((u_long)val, endp, base, octzero, xdigs, 272 needgrp, thousep, grp)); 273 switch (base) { 274 case 10: 275 if (val < 10) { 276 *--cp = to_char(val % 10); 277 return (cp); 278 } 279 ndig = 0; 280 if (val > INTMAX_MAX) { 281 *--cp = to_char(val % 10); 282 ndig++; 283 sval = val / 10; 284 } else 285 sval = val; 286 do { 287 *--cp = to_char(sval % 10); 288 ndig++; 289 /* 290 * If (*grp == CHAR_MAX) then no more grouping 291 * should be performed. 292 */ 293 if (needgrp && *grp != CHAR_MAX && ndig == *grp 294 && sval > 9) { 295 *--cp = thousep; 296 ndig = 0; 297 /* 298 * If (*(grp+1) == '\0') then we have to 299 * use *grp character (last grouping rule) 300 * for all next cases 301 */ 302 if (*(grp+1) != '\0') 303 grp++; 304 } 305 sval /= 10; 306 } while (sval != 0); 307 break; 308 309 case 8: 310 do { 311 *--cp = to_char(val & 7); 312 val >>= 3; 313 } while (val); 314 if (octzero && *cp != '0') 315 *--cp = '0'; 316 break; 317 318 case 16: 319 do { 320 *--cp = xdigs[val & 15]; 321 val >>= 4; 322 } while (val); 323 break; 324 325 default: 326 abort(); 327 } 328 return (cp); 329 } 330 331 /* 332 * MT-safe version 333 */ 334 int 335 vfprintf(FILE *__restrict fp, const char *__restrict fmt0, va_list ap) 336 337 { 338 int ret; 339 340 FLOCKFILE(fp); 341 ret = __vfprintf(fp, fmt0, ap); 342 FUNLOCKFILE(fp); 343 return (ret); 344 } 345 346 #ifdef FLOATING_POINT 347 #include <math.h> 348 #include "floatio.h" 349 350 #define BUF ((MAXEXP*2)+MAXFRACT+1) /* + decimal point */ 351 #define DEFPREC 6 352 353 static char *cvt(double, int, int, char *, int *, int, int *, char **); 354 static int exponent(char *, int, int); 355 356 #else /* no FLOATING_POINT */ 357 358 #define BUF 136 359 360 #endif /* FLOATING_POINT */ 361 362 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 363 364 /* 365 * Flags used during conversion. 366 */ 367 #define ALT 0x001 /* alternate form */ 368 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 369 #define LADJUST 0x004 /* left adjustment */ 370 #define LONGDBL 0x008 /* long double */ 371 #define LONGINT 0x010 /* long integer */ 372 #define LLONGINT 0x020 /* long long integer */ 373 #define SHORTINT 0x040 /* short integer */ 374 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 375 #define FPT 0x100 /* Floating point number */ 376 #define GROUPING 0x200 /* use grouping ("'" flag) */ 377 /* C99 additional size modifiers: */ 378 #define SIZET 0x400 /* size_t */ 379 #define PTRDIFFT 0x800 /* ptrdiff_t */ 380 #define INTMAXT 0x1000 /* intmax_t */ 381 #define CHARINT 0x2000 /* print char using int format */ 382 383 /* 384 * Non-MT-safe version 385 */ 386 int 387 __vfprintf(FILE *fp, const char *fmt0, va_list ap) 388 { 389 char *fmt; /* format string */ 390 int ch; /* character from fmt */ 391 int n, n2; /* handy integer (short term usage) */ 392 char *cp; /* handy char pointer (short term usage) */ 393 struct __siov *iovp; /* for PRINT macro */ 394 int flags; /* flags as above */ 395 int ret; /* return value accumulator */ 396 int width; /* width from format (%8d), or 0 */ 397 int prec; /* precision from format (%.3d), or -1 */ 398 char sign; /* sign prefix (' ', '+', '-', or \0) */ 399 char thousands_sep; /* locale specific thousands separator */ 400 const char *grouping; /* locale specific numeric grouping rules */ 401 #ifdef FLOATING_POINT 402 char *decimal_point; /* locale specific decimal point */ 403 char softsign; /* temporary negative sign for floats */ 404 double _double; /* double precision arguments %[eEfgG] */ 405 int expt; /* integer value of exponent */ 406 int expsize; /* character count for expstr */ 407 int ndig; /* actual number of digits returned by cvt */ 408 char expstr[7]; /* buffer for exponent string */ 409 char *dtoaresult; /* buffer allocated by dtoa */ 410 #endif 411 u_long ulval; /* integer arguments %[diouxX] */ 412 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 413 int base; /* base for [diouxX] conversion */ 414 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 415 int realsz; /* field size expanded by dprec, sign, etc */ 416 int size; /* size of converted field or string */ 417 int prsize; /* max size of printed field */ 418 char *xdigs; /* digits for [xX] conversion */ 419 #define NIOV 8 420 struct __suio uio; /* output information: summary */ 421 struct __siov iov[NIOV];/* ... and individual io vectors */ 422 char buf[BUF]; /* space for %c, %[diouxX], %[eEfFgG] */ 423 char ox[2]; /* space for 0x hex-prefix */ 424 union arg *argtable; /* args, built due to positional arg */ 425 union arg statargtable [STATIC_ARG_TBL_SIZE]; 426 int nextarg; /* 1-based argument index */ 427 va_list orgap; /* original argument pointer */ 428 429 /* 430 * Choose PADSIZE to trade efficiency vs. size. If larger printf 431 * fields occur frequently, increase PADSIZE and make the initialisers 432 * below longer. 433 */ 434 #define PADSIZE 16 /* pad chunk size */ 435 static char blanks[PADSIZE] = 436 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 437 static char zeroes[PADSIZE] = 438 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 439 440 /* 441 * BEWARE, these `goto error' on error, and PAD uses `n'. 442 */ 443 #define PRINT(ptr, len) { \ 444 iovp->iov_base = (ptr); \ 445 iovp->iov_len = (len); \ 446 uio.uio_resid += (len); \ 447 iovp++; \ 448 if (++uio.uio_iovcnt >= NIOV) { \ 449 if (__sprint(fp, &uio)) \ 450 goto error; \ 451 iovp = iov; \ 452 } \ 453 } 454 #define PAD(howmany, with) { \ 455 if ((n = (howmany)) > 0) { \ 456 while (n > PADSIZE) { \ 457 PRINT(with, PADSIZE); \ 458 n -= PADSIZE; \ 459 } \ 460 PRINT(with, n); \ 461 } \ 462 } 463 #define FLUSH() { \ 464 if (uio.uio_resid && __sprint(fp, &uio)) \ 465 goto error; \ 466 uio.uio_iovcnt = 0; \ 467 iovp = iov; \ 468 } 469 470 /* 471 * Get the argument indexed by nextarg. If the argument table is 472 * built, use it to get the argument. If its not, get the next 473 * argument (and arguments must be gotten sequentially). 474 */ 475 #define GETARG(type) \ 476 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 477 (nextarg++, va_arg(ap, type))) 478 479 /* 480 * To extend shorts properly, we need both signed and unsigned 481 * argument extraction methods. 482 */ 483 #define SARG() \ 484 (flags&LONGINT ? GETARG(long) : \ 485 flags&SHORTINT ? (long)(short)GETARG(int) : \ 486 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 487 (long)GETARG(int)) 488 #define UARG() \ 489 (flags&LONGINT ? GETARG(u_long) : \ 490 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 491 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 492 (u_long)GETARG(u_int)) 493 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 494 #define SJARG() \ 495 (flags&INTMAXT ? GETARG(intmax_t) : \ 496 flags&SIZET ? (intmax_t)GETARG(size_t) : \ 497 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 498 (intmax_t)GETARG(long long)) 499 #define UJARG() \ 500 (flags&INTMAXT ? GETARG(uintmax_t) : \ 501 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 502 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 503 (uintmax_t)GETARG(unsigned long long)) 504 505 /* 506 * Get * arguments, including the form *nn$. Preserve the nextarg 507 * that the argument can be gotten once the type is determined. 508 */ 509 #define GETASTER(val) \ 510 n2 = 0; \ 511 cp = fmt; \ 512 while (is_digit(*cp)) { \ 513 n2 = 10 * n2 + to_digit(*cp); \ 514 cp++; \ 515 } \ 516 if (*cp == '$') { \ 517 int hold = nextarg; \ 518 if (argtable == NULL) { \ 519 argtable = statargtable; \ 520 __find_arguments (fmt0, orgap, &argtable); \ 521 } \ 522 nextarg = n2; \ 523 val = GETARG (int); \ 524 nextarg = hold; \ 525 fmt = ++cp; \ 526 } else { \ 527 val = GETARG (int); \ 528 } 529 530 531 thousands_sep = '\0'; 532 grouping = NULL; 533 #ifdef FLOATING_POINT 534 dtoaresult = NULL; 535 decimal_point = localeconv()->decimal_point; 536 #endif 537 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 538 if (cantwrite(fp)) 539 return (EOF); 540 541 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 542 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 543 fp->_file >= 0) 544 return (__sbprintf(fp, fmt0, ap)); 545 546 fmt = (char *)fmt0; 547 argtable = NULL; 548 nextarg = 1; 549 orgap = ap; 550 uio.uio_iov = iovp = iov; 551 uio.uio_resid = 0; 552 uio.uio_iovcnt = 0; 553 ret = 0; 554 555 /* 556 * Scan the format for conversions (`%' character). 557 */ 558 for (;;) { 559 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 560 /* void */; 561 if ((n = fmt - cp) != 0) { 562 if ((unsigned)ret + n > INT_MAX) { 563 ret = EOF; 564 goto error; 565 } 566 PRINT(cp, n); 567 ret += n; 568 } 569 if (ch == '\0') 570 goto done; 571 fmt++; /* skip over '%' */ 572 573 flags = 0; 574 dprec = 0; 575 width = 0; 576 prec = -1; 577 sign = '\0'; 578 579 rflag: ch = *fmt++; 580 reswitch: switch (ch) { 581 case ' ': 582 /*- 583 * ``If the space and + flags both appear, the space 584 * flag will be ignored.'' 585 * -- ANSI X3J11 586 */ 587 if (!sign) 588 sign = ' '; 589 goto rflag; 590 case '#': 591 flags |= ALT; 592 goto rflag; 593 case '*': 594 /*- 595 * ``A negative field width argument is taken as a 596 * - flag followed by a positive field width.'' 597 * -- ANSI X3J11 598 * They don't exclude field widths read from args. 599 */ 600 GETASTER (width); 601 if (width >= 0) 602 goto rflag; 603 width = -width; 604 /* FALLTHROUGH */ 605 case '-': 606 flags |= LADJUST; 607 goto rflag; 608 case '+': 609 sign = '+'; 610 goto rflag; 611 case '\'': 612 flags |= GROUPING; 613 thousands_sep = *(localeconv()->thousands_sep); 614 grouping = localeconv()->grouping; 615 goto rflag; 616 case '.': 617 if ((ch = *fmt++) == '*') { 618 GETASTER (n); 619 prec = n < 0 ? -1 : n; 620 goto rflag; 621 } 622 n = 0; 623 while (is_digit(ch)) { 624 n = 10 * n + to_digit(ch); 625 ch = *fmt++; 626 } 627 prec = n < 0 ? -1 : n; 628 goto reswitch; 629 case '0': 630 /*- 631 * ``Note that 0 is taken as a flag, not as the 632 * beginning of a field width.'' 633 * -- ANSI X3J11 634 */ 635 flags |= ZEROPAD; 636 goto rflag; 637 case '1': case '2': case '3': case '4': 638 case '5': case '6': case '7': case '8': case '9': 639 n = 0; 640 do { 641 n = 10 * n + to_digit(ch); 642 ch = *fmt++; 643 } while (is_digit(ch)); 644 if (ch == '$') { 645 nextarg = n; 646 if (argtable == NULL) { 647 argtable = statargtable; 648 __find_arguments (fmt0, orgap, 649 &argtable); 650 } 651 goto rflag; 652 } 653 width = n; 654 goto reswitch; 655 #ifdef FLOATING_POINT 656 case 'L': 657 flags |= LONGDBL; 658 goto rflag; 659 #endif 660 case 'h': 661 if (flags & SHORTINT) { 662 flags &= ~SHORTINT; 663 flags |= CHARINT; 664 } else 665 flags |= SHORTINT; 666 goto rflag; 667 case 'j': 668 flags |= INTMAXT; 669 goto rflag; 670 case 'l': 671 if (flags & LONGINT) { 672 flags &= ~LONGINT; 673 flags |= LLONGINT; 674 } else 675 flags |= LONGINT; 676 goto rflag; 677 case 'q': 678 flags |= LLONGINT; /* not necessarily */ 679 goto rflag; 680 case 't': 681 flags |= PTRDIFFT; 682 goto rflag; 683 case 'z': 684 flags |= SIZET; 685 goto rflag; 686 case 'c': 687 *(cp = buf) = GETARG(int); 688 size = 1; 689 sign = '\0'; 690 break; 691 case 'D': 692 flags |= LONGINT; 693 /*FALLTHROUGH*/ 694 case 'd': 695 case 'i': 696 if (flags & INTMAX_SIZE) { 697 ujval = SJARG(); 698 if ((intmax_t)ujval < 0) { 699 ujval = -ujval; 700 sign = '-'; 701 } 702 } else { 703 ulval = SARG(); 704 if ((long)ulval < 0) { 705 ulval = -ulval; 706 sign = '-'; 707 } 708 } 709 base = 10; 710 goto number; 711 #ifdef FLOATING_POINT 712 #ifdef HEXFLOAT 713 case 'a': 714 case 'A': 715 #endif 716 case 'e': 717 case 'E': 718 /*- 719 * Grouping apply to %i, %d, %u, %f, %F, %g, %G 720 * conversion specifiers only. For other conversions 721 * behavior is undefined. 722 * -- POSIX 723 */ 724 flags &= ~GROUPING; 725 /*FALLTHROUGH*/ 726 case 'f': 727 case 'F': 728 goto fp_begin; 729 case 'g': 730 case 'G': 731 if (prec == 0) 732 prec = 1; 733 fp_begin: if (prec == -1) 734 prec = DEFPREC; 735 if (flags & LONGDBL) 736 /* XXX this loses precision. */ 737 _double = (double)GETARG(long double); 738 else 739 _double = GETARG(double); 740 /* do this before tricky precision changes */ 741 if (isinf(_double)) { 742 if (_double < 0) 743 sign = '-'; 744 if (isupper(ch)) 745 cp = "INF"; 746 else 747 cp = "inf"; 748 size = 3; 749 break; 750 } 751 if (isnan(_double)) { 752 if (isupper(ch)) 753 cp = "NAN"; 754 else 755 cp = "nan"; 756 size = 3; 757 break; 758 } 759 flags |= FPT; 760 if (dtoaresult != NULL) { 761 free(dtoaresult); 762 dtoaresult = NULL; 763 } 764 cp = cvt(_double, prec, flags, &softsign, 765 &expt, ch, &ndig, &dtoaresult); 766 if (ch == 'g' || ch == 'G') { 767 if (expt <= -4 || expt > prec) 768 ch = (ch == 'g') ? 'e' : 'E'; 769 else 770 ch = 'g'; 771 } 772 if (ch == 'e' || ch == 'E') { 773 --expt; 774 expsize = exponent(expstr, expt, ch); 775 size = expsize + ndig; 776 if (ndig > 1 || flags & ALT) 777 ++size; 778 } else if (ch == 'f' || ch == 'F') { 779 if (expt > 0) { 780 size = expt; 781 if (prec || flags & ALT) 782 size += prec + 1; 783 } else /* "0.X" */ 784 size = prec + 2; 785 } else if (expt >= ndig) { /* fixed g fmt */ 786 size = expt; 787 if (flags & ALT) 788 ++size; 789 } else 790 size = ndig + (expt > 0 ? 791 1 : 2 - expt); 792 793 if (softsign) 794 sign = '-'; 795 break; 796 #endif /* FLOATING_POINT */ 797 case 'n': 798 /* 799 * Assignment-like behavior is specified if the 800 * value overflows or is otherwise unrepresentable. 801 * C99 says to use `signed char' for %hhn conversions. 802 */ 803 if (flags & LLONGINT) 804 *GETARG(long long *) = ret; 805 else if (flags & SIZET) 806 *GETARG(ssize_t *) = (ssize_t)ret; 807 else if (flags & PTRDIFFT) 808 *GETARG(ptrdiff_t *) = ret; 809 else if (flags & INTMAXT) 810 *GETARG(intmax_t *) = ret; 811 else if (flags & LONGINT) 812 *GETARG(long *) = ret; 813 else if (flags & SHORTINT) 814 *GETARG(short *) = ret; 815 else if (flags & CHARINT) 816 *GETARG(signed char *) = ret; 817 else 818 *GETARG(int *) = ret; 819 continue; /* no output */ 820 case 'O': 821 flags |= LONGINT; 822 /*FALLTHROUGH*/ 823 case 'o': 824 if (flags & INTMAX_SIZE) 825 ujval = UJARG(); 826 else 827 ulval = UARG(); 828 base = 8; 829 goto nosign; 830 case 'p': 831 /*- 832 * ``The argument shall be a pointer to void. The 833 * value of the pointer is converted to a sequence 834 * of printable characters, in an implementation- 835 * defined manner.'' 836 * -- ANSI X3J11 837 */ 838 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 839 base = 16; 840 xdigs = "0123456789abcdef"; 841 flags = flags | INTMAXT | HEXPREFIX; 842 ch = 'x'; 843 goto nosign; 844 case 's': 845 if ((cp = GETARG(char *)) == NULL) 846 cp = "(null)"; 847 if (prec >= 0) { 848 /* 849 * can't use strlen; can only look for the 850 * NUL in the first `prec' characters, and 851 * strlen() will go further. 852 */ 853 char *p = memchr(cp, 0, (size_t)prec); 854 855 if (p != NULL) { 856 size = p - cp; 857 if (size > prec) 858 size = prec; 859 } else 860 size = prec; 861 } else 862 size = strlen(cp); 863 sign = '\0'; 864 break; 865 case 'U': 866 flags |= LONGINT; 867 /*FALLTHROUGH*/ 868 case 'u': 869 if (flags & INTMAX_SIZE) 870 ujval = UJARG(); 871 else 872 ulval = UARG(); 873 base = 10; 874 goto nosign; 875 case 'X': 876 xdigs = "0123456789ABCDEF"; 877 goto hex; 878 case 'x': 879 xdigs = "0123456789abcdef"; 880 hex: 881 if (flags & INTMAX_SIZE) 882 ujval = UJARG(); 883 else 884 ulval = UARG(); 885 base = 16; 886 /* leading 0x/X only if non-zero */ 887 if (flags & ALT && 888 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 889 flags |= HEXPREFIX; 890 891 flags &= ~GROUPING; 892 /* unsigned conversions */ 893 nosign: sign = '\0'; 894 /*- 895 * ``... diouXx conversions ... if a precision is 896 * specified, the 0 flag will be ignored.'' 897 * -- ANSI X3J11 898 */ 899 number: if ((dprec = prec) >= 0) 900 flags &= ~ZEROPAD; 901 902 /*- 903 * ``The result of converting a zero value with an 904 * explicit precision of zero is no characters.'' 905 * -- ANSI X3J11 906 */ 907 cp = buf + BUF; 908 if (flags & INTMAX_SIZE) { 909 if (ujval != 0 || prec != 0) 910 cp = __ujtoa(ujval, cp, base, 911 flags & ALT, xdigs, 912 flags & GROUPING, thousands_sep, 913 grouping); 914 } else { 915 if (ulval != 0 || prec != 0) 916 cp = __ultoa(ulval, cp, base, 917 flags & ALT, xdigs, 918 flags & GROUPING, thousands_sep, 919 grouping); 920 } 921 size = buf + BUF - cp; 922 break; 923 default: /* "%?" prints ?, unless ? is NUL */ 924 if (ch == '\0') 925 goto done; 926 /* pretend it was %c with argument ch */ 927 cp = buf; 928 *cp = ch; 929 size = 1; 930 sign = '\0'; 931 break; 932 } 933 934 /* 935 * All reasonable formats wind up here. At this point, `cp' 936 * points to a string which (if not flags&LADJUST) should be 937 * padded out to `width' places. If flags&ZEROPAD, it should 938 * first be prefixed by any sign or other prefix; otherwise, 939 * it should be blank padded before the prefix is emitted. 940 * After any left-hand padding and prefixing, emit zeroes 941 * required by a decimal [diouxX] precision, then print the 942 * string proper, then emit zeroes required by any leftover 943 * floating precision; finally, if LADJUST, pad with blanks. 944 * 945 * Compute actual size, so we know how much to pad. 946 * size excludes decimal prec; realsz includes it. 947 */ 948 realsz = dprec > size ? dprec : size; 949 if (sign) 950 realsz++; 951 else if (flags & HEXPREFIX) 952 realsz += 2; 953 954 prsize = width > realsz ? width : realsz; 955 if ((unsigned)ret + prsize > INT_MAX) { 956 ret = EOF; 957 goto error; 958 } 959 960 /* right-adjusting blank padding */ 961 if ((flags & (LADJUST|ZEROPAD)) == 0) 962 PAD(width - realsz, blanks); 963 964 /* prefix */ 965 if (sign) { 966 PRINT(&sign, 1); 967 } else if (flags & HEXPREFIX) { 968 ox[0] = '0'; 969 ox[1] = ch; 970 PRINT(ox, 2); 971 } 972 973 /* right-adjusting zero padding */ 974 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 975 PAD(width - realsz, zeroes); 976 977 /* leading zeroes from decimal precision */ 978 PAD(dprec - size, zeroes); 979 980 /* the string or number proper */ 981 #ifdef FLOATING_POINT 982 if ((flags & FPT) == 0) { 983 PRINT(cp, size); 984 } else { /* glue together f_p fragments */ 985 if (ch >= 'f') { /* 'f' or 'g' */ 986 if (_double == 0) { 987 /* kludge for __dtoa irregularity */ 988 PRINT("0", 1); 989 if (expt < ndig || (flags & ALT) != 0) { 990 PRINT(decimal_point, 1); 991 PAD(ndig - 1, zeroes); 992 } 993 } else if (expt <= 0) { 994 PRINT("0", 1); 995 PRINT(decimal_point, 1); 996 PAD(-expt, zeroes); 997 PRINT(cp, ndig); 998 } else if (expt >= ndig) { 999 PRINT(cp, ndig); 1000 PAD(expt - ndig, zeroes); 1001 if (flags & ALT) 1002 PRINT(decimal_point, 1); 1003 } else { 1004 PRINT(cp, expt); 1005 cp += expt; 1006 PRINT(decimal_point, 1); 1007 PRINT(cp, ndig-expt); 1008 } 1009 } else { /* 'e' or 'E' */ 1010 if (ndig > 1 || flags & ALT) { 1011 ox[0] = *cp++; 1012 ox[1] = *decimal_point; 1013 PRINT(ox, 2); 1014 if (_double) { 1015 PRINT(cp, ndig-1); 1016 } else /* 0.[0..] */ 1017 /* __dtoa irregularity */ 1018 PAD(ndig - 1, zeroes); 1019 } else /* XeYYY */ 1020 PRINT(cp, 1); 1021 PRINT(expstr, expsize); 1022 } 1023 } 1024 #else 1025 PRINT(cp, size); 1026 #endif 1027 /* left-adjusting padding (always blank) */ 1028 if (flags & LADJUST) 1029 PAD(width - realsz, blanks); 1030 1031 /* finally, adjust ret */ 1032 ret += prsize; 1033 1034 FLUSH(); /* copy out the I/O vectors */ 1035 } 1036 done: 1037 FLUSH(); 1038 error: 1039 #ifdef FLOATING_POINT 1040 if (dtoaresult != NULL) 1041 free(dtoaresult); 1042 #endif 1043 if (__sferror(fp)) 1044 ret = EOF; 1045 if ((argtable != NULL) && (argtable != statargtable)) 1046 free (argtable); 1047 return (ret); 1048 /* NOTREACHED */ 1049 } 1050 1051 /* 1052 * Find all arguments when a positional parameter is encountered. Returns a 1053 * table, indexed by argument number, of pointers to each arguments. The 1054 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 1055 * It will be replaces with a malloc-ed one if it overflows. 1056 */ 1057 static void 1058 __find_arguments (const char *fmt0, va_list ap, union arg **argtable) 1059 { 1060 char *fmt; /* format string */ 1061 int ch; /* character from fmt */ 1062 int n, n2; /* handy integer (short term usage) */ 1063 char *cp; /* handy char pointer (short term usage) */ 1064 int flags; /* flags as above */ 1065 int width; /* width from format (%8d), or 0 */ 1066 enum typeid *typetable; /* table of types */ 1067 enum typeid stattypetable [STATIC_ARG_TBL_SIZE]; 1068 int tablesize; /* current size of type table */ 1069 int tablemax; /* largest used index in table */ 1070 int nextarg; /* 1-based argument index */ 1071 1072 /* 1073 * Add an argument type to the table, expanding if necessary. 1074 */ 1075 #define ADDTYPE(type) \ 1076 ((nextarg >= tablesize) ? \ 1077 __grow_type_table(nextarg, &typetable, &tablesize) : 0, \ 1078 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 1079 typetable[nextarg++] = type) 1080 1081 #define ADDSARG() \ 1082 ((flags&INTMAXT) ? ADDTYPE(T_INTMAXT) : \ 1083 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1084 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1085 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 1086 ((flags&LONGINT) ? ADDTYPE(T_LONG) : ADDTYPE(T_INT)))))) 1087 1088 #define ADDUARG() \ 1089 ((flags&INTMAXT) ? ADDTYPE(T_UINTMAXT) : \ 1090 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1091 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1092 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 1093 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : ADDTYPE(T_U_INT)))))) 1094 1095 /* 1096 * Add * arguments to the type array. 1097 */ 1098 #define ADDASTER() \ 1099 n2 = 0; \ 1100 cp = fmt; \ 1101 while (is_digit(*cp)) { \ 1102 n2 = 10 * n2 + to_digit(*cp); \ 1103 cp++; \ 1104 } \ 1105 if (*cp == '$') { \ 1106 int hold = nextarg; \ 1107 nextarg = n2; \ 1108 ADDTYPE (T_INT); \ 1109 nextarg = hold; \ 1110 fmt = ++cp; \ 1111 } else { \ 1112 ADDTYPE (T_INT); \ 1113 } 1114 fmt = (char *)fmt0; 1115 typetable = stattypetable; 1116 tablesize = STATIC_ARG_TBL_SIZE; 1117 tablemax = 0; 1118 nextarg = 1; 1119 memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 1120 1121 /* 1122 * Scan the format for conversions (`%' character). 1123 */ 1124 for (;;) { 1125 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 1126 /* void */; 1127 if (ch == '\0') 1128 goto done; 1129 fmt++; /* skip over '%' */ 1130 1131 flags = 0; 1132 width = 0; 1133 1134 rflag: ch = *fmt++; 1135 reswitch: switch (ch) { 1136 case ' ': 1137 case '#': 1138 goto rflag; 1139 case '*': 1140 ADDASTER (); 1141 goto rflag; 1142 case '-': 1143 case '+': 1144 case '\'': 1145 goto rflag; 1146 case '.': 1147 if ((ch = *fmt++) == '*') { 1148 ADDASTER (); 1149 goto rflag; 1150 } 1151 while (is_digit(ch)) { 1152 ch = *fmt++; 1153 } 1154 goto reswitch; 1155 case '0': 1156 goto rflag; 1157 case '1': case '2': case '3': case '4': 1158 case '5': case '6': case '7': case '8': case '9': 1159 n = 0; 1160 do { 1161 n = 10 * n + to_digit(ch); 1162 ch = *fmt++; 1163 } while (is_digit(ch)); 1164 if (ch == '$') { 1165 nextarg = n; 1166 goto rflag; 1167 } 1168 width = n; 1169 goto reswitch; 1170 #ifdef FLOATING_POINT 1171 case 'L': 1172 flags |= LONGDBL; 1173 goto rflag; 1174 #endif 1175 case 'h': 1176 if (flags & SHORTINT) { 1177 flags &= ~SHORTINT; 1178 flags |= CHARINT; 1179 } else 1180 flags |= SHORTINT; 1181 goto rflag; 1182 case 'j': 1183 flags |= INTMAXT; 1184 goto rflag; 1185 case 'l': 1186 if (flags & LONGINT) { 1187 flags &= ~LONGINT; 1188 flags |= LLONGINT; 1189 } else 1190 flags |= LONGINT; 1191 goto rflag; 1192 case 'q': 1193 flags |= LLONGINT; /* not necessarily */ 1194 goto rflag; 1195 case 't': 1196 flags |= PTRDIFFT; 1197 goto rflag; 1198 case 'z': 1199 flags |= SIZET; 1200 goto rflag; 1201 case 'c': 1202 ADDTYPE(T_INT); 1203 break; 1204 case 'D': 1205 flags |= LONGINT; 1206 /*FALLTHROUGH*/ 1207 case 'd': 1208 case 'i': 1209 ADDSARG(); 1210 break; 1211 #ifdef FLOATING_POINT 1212 #ifdef HEXFLOAT 1213 case 'a': 1214 case 'A': 1215 #endif 1216 case 'e': 1217 case 'E': 1218 case 'f': 1219 case 'g': 1220 case 'G': 1221 if (flags & LONGDBL) 1222 ADDTYPE(T_LONG_DOUBLE); 1223 else 1224 ADDTYPE(T_DOUBLE); 1225 break; 1226 #endif /* FLOATING_POINT */ 1227 case 'n': 1228 if (flags & INTMAXT) 1229 ADDTYPE(TP_INTMAXT); 1230 else if (flags & PTRDIFFT) 1231 ADDTYPE(TP_PTRDIFFT); 1232 else if (flags & SIZET) 1233 ADDTYPE(TP_SIZET); 1234 else if (flags & LLONGINT) 1235 ADDTYPE(TP_LLONG); 1236 else if (flags & LONGINT) 1237 ADDTYPE(TP_LONG); 1238 else if (flags & SHORTINT) 1239 ADDTYPE(TP_SHORT); 1240 else if (flags & CHARINT) 1241 ADDTYPE(TP_SCHAR); 1242 else 1243 ADDTYPE(TP_INT); 1244 continue; /* no output */ 1245 case 'O': 1246 flags |= LONGINT; 1247 /*FALLTHROUGH*/ 1248 case 'o': 1249 ADDUARG(); 1250 break; 1251 case 'p': 1252 ADDTYPE(TP_VOID); 1253 break; 1254 case 's': 1255 ADDTYPE(TP_CHAR); 1256 break; 1257 case 'U': 1258 flags |= LONGINT; 1259 /*FALLTHROUGH*/ 1260 case 'u': 1261 case 'X': 1262 case 'x': 1263 ADDUARG(); 1264 break; 1265 default: /* "%?" prints ?, unless ? is NUL */ 1266 if (ch == '\0') 1267 goto done; 1268 break; 1269 } 1270 } 1271 done: 1272 /* 1273 * Build the argument table. 1274 */ 1275 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1276 *argtable = (union arg *) 1277 malloc (sizeof (union arg) * (tablemax + 1)); 1278 } 1279 1280 (*argtable) [0].intarg = 0; 1281 for (n = 1; n <= tablemax; n++) { 1282 switch (typetable [n]) { 1283 case T_UNUSED: /* whoops! */ 1284 (*argtable) [n].intarg = va_arg (ap, int); 1285 break; 1286 case TP_SCHAR: 1287 (*argtable) [n].pschararg = va_arg (ap, signed char *); 1288 break; 1289 case TP_SHORT: 1290 (*argtable) [n].pshortarg = va_arg (ap, short *); 1291 break; 1292 case T_INT: 1293 (*argtable) [n].intarg = va_arg (ap, int); 1294 break; 1295 case T_U_INT: 1296 (*argtable) [n].uintarg = va_arg (ap, unsigned int); 1297 break; 1298 case TP_INT: 1299 (*argtable) [n].pintarg = va_arg (ap, int *); 1300 break; 1301 case T_LONG: 1302 (*argtable) [n].longarg = va_arg (ap, long); 1303 break; 1304 case T_U_LONG: 1305 (*argtable) [n].ulongarg = va_arg (ap, unsigned long); 1306 break; 1307 case TP_LONG: 1308 (*argtable) [n].plongarg = va_arg (ap, long *); 1309 break; 1310 case T_LLONG: 1311 (*argtable) [n].longlongarg = va_arg (ap, long long); 1312 break; 1313 case T_U_LLONG: 1314 (*argtable) [n].ulonglongarg = va_arg (ap, unsigned long long); 1315 break; 1316 case TP_LLONG: 1317 (*argtable) [n].plonglongarg = va_arg (ap, long long *); 1318 break; 1319 case T_PTRDIFFT: 1320 (*argtable) [n].ptrdiffarg = va_arg (ap, ptrdiff_t); 1321 break; 1322 case TP_PTRDIFFT: 1323 (*argtable) [n].pptrdiffarg = va_arg (ap, ptrdiff_t *); 1324 break; 1325 case T_SIZET: 1326 (*argtable) [n].sizearg = va_arg (ap, size_t); 1327 break; 1328 case TP_SIZET: 1329 (*argtable) [n].psizearg = va_arg (ap, ssize_t *); 1330 break; 1331 case T_INTMAXT: 1332 (*argtable) [n].intmaxarg = va_arg (ap, intmax_t); 1333 break; 1334 case T_UINTMAXT: 1335 (*argtable) [n].uintmaxarg = va_arg (ap, uintmax_t); 1336 break; 1337 case TP_INTMAXT: 1338 (*argtable) [n].pintmaxarg = va_arg (ap, intmax_t *); 1339 break; 1340 #ifdef FLOATING_POINT 1341 case T_DOUBLE: 1342 (*argtable) [n].doublearg = va_arg (ap, double); 1343 break; 1344 case T_LONG_DOUBLE: 1345 (*argtable) [n].longdoublearg = va_arg (ap, long double); 1346 break; 1347 #endif 1348 case TP_CHAR: 1349 (*argtable) [n].pchararg = va_arg (ap, char *); 1350 break; 1351 case TP_VOID: 1352 (*argtable) [n].pvoidarg = va_arg (ap, void *); 1353 break; 1354 } 1355 } 1356 1357 if ((typetable != NULL) && (typetable != stattypetable)) 1358 free (typetable); 1359 } 1360 1361 /* 1362 * Increase the size of the type table. 1363 */ 1364 static void 1365 __grow_type_table (int nextarg, enum typeid **typetable, int *tablesize) 1366 { 1367 enum typeid *const oldtable = *typetable; 1368 const int oldsize = *tablesize; 1369 enum typeid *newtable; 1370 int newsize = oldsize * 2; 1371 1372 if (newsize < nextarg + 1) 1373 newsize = nextarg + 1; 1374 if (oldsize == STATIC_ARG_TBL_SIZE) { 1375 if ((newtable = malloc(newsize)) == NULL) 1376 abort(); /* XXX handle better */ 1377 bcopy(oldtable, newtable, oldsize); 1378 } else { 1379 if ((newtable = reallocf(oldtable, newsize)) == NULL) 1380 abort(); /* XXX handle better */ 1381 } 1382 memset(&newtable[oldsize], T_UNUSED, newsize - oldsize); 1383 1384 *typetable = newtable; 1385 *tablesize = newsize; 1386 } 1387 1388 1389 #ifdef FLOATING_POINT 1390 1391 extern char *__dtoa(double, int, int, int *, int *, char **, char **); 1392 1393 static char * 1394 cvt(double value, int ndigits, int flags, char *sign, int *decpt, 1395 int ch, int *length, char **dtoaresultp) 1396 { 1397 int mode, dsgn; 1398 char *digits, *bp, *rve; 1399 1400 if (ch == 'f') 1401 mode = 3; /* ndigits after the decimal point */ 1402 else { 1403 /* 1404 * To obtain ndigits after the decimal point for the 'e' 1405 * and 'E' formats, round to ndigits + 1 significant 1406 * figures. 1407 */ 1408 if (ch == 'e' || ch == 'E') 1409 ndigits++; 1410 mode = 2; /* ndigits significant digits */ 1411 } 1412 if (value < 0) { 1413 value = -value; 1414 *sign = '-'; 1415 } else 1416 *sign = '\000'; 1417 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve, 1418 dtoaresultp); 1419 if ((ch != 'g' && ch != 'G') || flags & ALT) { 1420 /* print trailing zeros */ 1421 bp = digits + ndigits; 1422 if (ch == 'f') { 1423 if (*digits == '0' && value) 1424 *decpt = -ndigits + 1; 1425 bp += *decpt; 1426 } 1427 if (value == 0) /* kludge for __dtoa irregularity */ 1428 rve = bp; 1429 while (rve < bp) 1430 *rve++ = '0'; 1431 } 1432 *length = rve - digits; 1433 return (digits); 1434 } 1435 1436 static int 1437 exponent(char *p0, int exp, int fmtch) 1438 { 1439 char *p, *t; 1440 char expbuf[MAXEXP]; 1441 1442 p = p0; 1443 *p++ = fmtch; 1444 if (exp < 0) { 1445 exp = -exp; 1446 *p++ = '-'; 1447 } 1448 else 1449 *p++ = '+'; 1450 t = expbuf + MAXEXP; 1451 if (exp > 9) { 1452 do { 1453 *--t = to_char(exp % 10); 1454 } while ((exp /= 10) > 9); 1455 *--t = to_char(exp); 1456 for (; t < expbuf + MAXEXP; *p++ = *t++); 1457 } 1458 else { 1459 *p++ = '0'; 1460 *p++ = to_char(exp); 1461 } 1462 return (p - p0); 1463 } 1464 #endif /* FLOATING_POINT */ 1465