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