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 #if __STDC__ 62 #include <stdarg.h> 63 #else 64 #include <varargs.h> 65 #endif 66 #include "un-namespace.h" 67 68 #include "libc_private.h" 69 #include "local.h" 70 #include "fvwrite.h" 71 72 /* Define FLOATING_POINT to get floating point. */ 73 #define FLOATING_POINT 74 75 union arg { 76 int intarg; 77 u_int uintarg; 78 long longarg; 79 u_long ulongarg; 80 long long longlongarg; 81 unsigned long long ulonglongarg; 82 ptrdiff_t ptrdiffarg; 83 size_t sizearg; 84 intmax_t intmaxarg; 85 uintmax_t uintmaxarg; 86 void *pvoidarg; 87 char *pchararg; 88 signed char *pschararg; 89 short *pshortarg; 90 int *pintarg; 91 long *plongarg; 92 long long *plonglongarg; 93 ptrdiff_t *pptrdiffarg; 94 size_t *psizearg; 95 intmax_t *pintmaxarg; 96 #ifdef FLOATING_POINT 97 double doublearg; 98 long double longdoublearg; 99 #endif 100 }; 101 102 /* 103 * Type ids for argument type table. 104 */ 105 enum typeid { 106 T_UNUSED, TP_SHORT, T_INT, T_U_INT, TP_INT, 107 T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG, 108 T_PTRDIFFT, TP_PTRDIFFT, T_SIZET, TP_SIZET, 109 T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR, 110 T_DOUBLE, T_LONG_DOUBLE 111 }; 112 113 static int __sprint(FILE *, struct __suio *); 114 static int __sbprintf(FILE *, const char *, va_list) __printflike(2, 0); 115 static char *__ujtoa(uintmax_t, char *, int, int, char *, int, char, 116 const char *); 117 static char *__ultoa(u_long, char *, int, int, char *, int, char, 118 const char *); 119 static void __find_arguments(const char *, va_list, union arg **); 120 static void __grow_type_table(int, enum typeid **, int *); 121 122 /* 123 * Flush out all the vectors defined by the given uio, 124 * then reset it so that it can be reused. 125 */ 126 static int 127 __sprint(FILE *fp, struct __suio *uio) 128 { 129 int err; 130 131 if (uio->uio_resid == 0) { 132 uio->uio_iovcnt = 0; 133 return (0); 134 } 135 err = __sfvwrite(fp, uio); 136 uio->uio_resid = 0; 137 uio->uio_iovcnt = 0; 138 return (err); 139 } 140 141 /* 142 * Helper function for `fprintf to unbuffered unix file': creates a 143 * temporary buffer. We only work on write-only files; this avoids 144 * worries about ungetc buffers and so forth. 145 */ 146 static int 147 __sbprintf(FILE *fp, const char *fmt, va_list ap) 148 { 149 int ret; 150 FILE fake; 151 unsigned char buf[BUFSIZ]; 152 153 /* copy the important variables */ 154 fake._flags = fp->_flags & ~__SNBF; 155 fake._file = fp->_file; 156 fake._cookie = fp->_cookie; 157 fake._write = fp->_write; 158 159 /* set up the buffer */ 160 fake._bf._base = fake._p = buf; 161 fake._bf._size = fake._w = sizeof(buf); 162 fake._lbfsize = 0; /* not actually used, but Just In Case */ 163 164 /* do the work, then copy any error status */ 165 ret = __vfprintf(&fake, fmt, ap); 166 if (ret >= 0 && __fflush(&fake)) 167 ret = EOF; 168 if (fake._flags & __SERR) 169 fp->_flags |= __SERR; 170 return (ret); 171 } 172 173 /* 174 * Macros for converting digits to letters and vice versa 175 */ 176 #define to_digit(c) ((c) - '0') 177 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 178 #define to_char(n) ((n) + '0') 179 180 /* 181 * Convert an unsigned long to ASCII for printf purposes, returning 182 * a pointer to the first character of the string representation. 183 * Octal numbers can be forced to have a leading zero; hex numbers 184 * use the given digits. 185 */ 186 static char * 187 __ultoa(u_long val, char *endp, int base, int octzero, char *xdigs, 188 int needgrp, char thousep, const char *grp) 189 { 190 char *cp = endp; 191 long sval; 192 int ndig; 193 194 /* 195 * Handle the three cases separately, in the hope of getting 196 * better/faster code. 197 */ 198 switch (base) { 199 case 10: 200 if (val < 10) { /* many numbers are 1 digit */ 201 *--cp = to_char(val); 202 return (cp); 203 } 204 ndig = 0; 205 /* 206 * On many machines, unsigned arithmetic is harder than 207 * signed arithmetic, so we do at most one unsigned mod and 208 * divide; this is sufficient to reduce the range of 209 * the incoming value to where signed arithmetic works. 210 */ 211 if (val > LONG_MAX) { 212 *--cp = to_char(val % 10); 213 ndig++; 214 sval = val / 10; 215 } else 216 sval = val; 217 do { 218 *--cp = to_char(sval % 10); 219 ndig++; 220 /* 221 * If (*grp == CHAR_MAX) then no more grouping 222 * should be performed. 223 */ 224 if (needgrp && ndig == *grp && *grp != CHAR_MAX 225 && sval > 9) { 226 *--cp = thousep; 227 ndig = 0; 228 /* 229 * If (*(grp+1) == '\0') then we have to 230 * use *grp character (last grouping rule) 231 * for all next cases 232 */ 233 if (*(grp+1) != '\0') 234 grp++; 235 } 236 sval /= 10; 237 } while (sval != 0); 238 break; 239 240 case 8: 241 do { 242 *--cp = to_char(val & 7); 243 val >>= 3; 244 } while (val); 245 if (octzero && *cp != '0') 246 *--cp = '0'; 247 break; 248 249 case 16: 250 do { 251 *--cp = xdigs[val & 15]; 252 val >>= 4; 253 } while (val); 254 break; 255 256 default: /* oops */ 257 abort(); 258 } 259 return (cp); 260 } 261 262 /* Identical to __ultoa, but for intmax_t. */ 263 static char * 264 __ujtoa(uintmax_t val, char *endp, int base, int octzero, char *xdigs, 265 int needgrp, char thousep, const char *grp) 266 { 267 char *cp = endp; 268 intmax_t sval; 269 int ndig; 270 271 /* quick test for small values; __ultoa is typically much faster */ 272 /* (perhaps instead we should run until small, then call __ultoa?) */ 273 if (val <= ULONG_MAX) 274 return (__ultoa((u_long)val, endp, base, octzero, xdigs, 275 needgrp, thousep, grp)); 276 switch (base) { 277 case 10: 278 if (val < 10) { 279 *--cp = to_char(val % 10); 280 return (cp); 281 } 282 ndig = 0; 283 if (val > INTMAX_MAX) { 284 *--cp = to_char(val % 10); 285 ndig++; 286 sval = val / 10; 287 } else 288 sval = val; 289 do { 290 *--cp = to_char(sval % 10); 291 ndig++; 292 /* 293 * If (*grp == CHAR_MAX) then no more grouping 294 * should be performed. 295 */ 296 if (needgrp && *grp != CHAR_MAX && ndig == *grp 297 && sval > 9) { 298 *--cp = thousep; 299 ndig = 0; 300 /* 301 * If (*(grp+1) == '\0') then we have to 302 * use *grp character (last grouping rule) 303 * for all next cases 304 */ 305 if (*(grp+1) != '\0') 306 grp++; 307 } 308 sval /= 10; 309 } while (sval != 0); 310 break; 311 312 case 8: 313 do { 314 *--cp = to_char(val & 7); 315 val >>= 3; 316 } while (val); 317 if (octzero && *cp != '0') 318 *--cp = '0'; 319 break; 320 321 case 16: 322 do { 323 *--cp = xdigs[val & 15]; 324 val >>= 4; 325 } while (val); 326 break; 327 328 default: 329 abort(); 330 } 331 return (cp); 332 } 333 334 /* 335 * MT-safe version 336 */ 337 int 338 vfprintf(FILE *fp, const char *fmt0, va_list ap) 339 { 340 int ret; 341 342 FLOCKFILE(fp); 343 ret = __vfprintf(fp, fmt0, ap); 344 FUNLOCKFILE(fp); 345 return (ret); 346 } 347 348 #ifdef FLOATING_POINT 349 #include <math.h> 350 #include "floatio.h" 351 352 #define BUF ((MAXEXP*2)+MAXFRACT+1) /* + decimal point */ 353 #define DEFPREC 6 354 355 static char *cvt(double, int, int, char *, int *, int, int *, char **); 356 static int exponent(char *, int, int); 357 358 #else /* no FLOATING_POINT */ 359 360 #define BUF 136 361 362 #endif /* FLOATING_POINT */ 363 364 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 365 366 /* 367 * Flags used during conversion. 368 */ 369 #define ALT 0x001 /* alternate form */ 370 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 371 #define LADJUST 0x004 /* left adjustment */ 372 #define LONGDBL 0x008 /* long double */ 373 #define LONGINT 0x010 /* long integer */ 374 #define LLONGINT 0x020 /* long long integer */ 375 #define SHORTINT 0x040 /* short integer */ 376 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 377 #define FPT 0x100 /* Floating point number */ 378 #define GROUPING 0x200 /* use grouping ("'" flag) */ 379 /* C99 additional size modifiers: */ 380 #define SIZET 0x400 /* size_t */ 381 #define PTRDIFFT 0x800 /* ptrdiff_t */ 382 #define INTMAXT 0x1000 /* intmax_t */ 383 #define CHARINT 0x2000 /* print char using int format */ 384 385 /* 386 * Non-MT-safe version 387 */ 388 int 389 __vfprintf(FILE *fp, const char *fmt0, va_list ap) 390 { 391 char *fmt; /* format string */ 392 int ch; /* character from fmt */ 393 int n, n2; /* handy integer (short term usage) */ 394 char *cp; /* handy char pointer (short term usage) */ 395 struct __siov *iovp; /* for PRINT macro */ 396 int flags; /* flags as above */ 397 int ret; /* return value accumulator */ 398 int width; /* width from format (%8d), or 0 */ 399 int prec; /* precision from format (%.3d), or -1 */ 400 char sign; /* sign prefix (' ', '+', '-', or \0) */ 401 char thousands_sep; /* locale specific thousands separator */ 402 const char *grouping; /* locale specific numeric grouping rules */ 403 #ifdef FLOATING_POINT 404 char *decimal_point; /* locale specific decimal point */ 405 char softsign; /* temporary negative sign for floats */ 406 double _double; /* double precision arguments %[eEfgG] */ 407 int expt; /* integer value of exponent */ 408 int expsize; /* character count for expstr */ 409 int ndig; /* actual number of digits returned by cvt */ 410 char expstr[7]; /* buffer for exponent string */ 411 char *dtoaresult; /* buffer allocated by dtoa */ 412 #endif 413 u_long ulval; /* integer arguments %[diouxX] */ 414 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 415 int base; /* base for [diouxX] conversion */ 416 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 417 int realsz; /* field size expanded by dprec, sign, etc */ 418 int size; /* size of converted field or string */ 419 int prsize; /* max size of printed field */ 420 char *xdigs; /* digits for [xX] conversion */ 421 #define NIOV 8 422 struct __suio uio; /* output information: summary */ 423 struct __siov iov[NIOV];/* ... and individual io vectors */ 424 char buf[BUF]; /* space for %c, %[diouxX], %[eEfFgG] */ 425 char ox[2]; /* space for 0x hex-prefix */ 426 union arg *argtable; /* args, built due to positional arg */ 427 union arg statargtable [STATIC_ARG_TBL_SIZE]; 428 int nextarg; /* 1-based argument index */ 429 va_list orgap; /* original argument pointer */ 430 431 /* 432 * Choose PADSIZE to trade efficiency vs. size. If larger printf 433 * fields occur frequently, increase PADSIZE and make the initialisers 434 * below longer. 435 */ 436 #define PADSIZE 16 /* pad chunk size */ 437 static char blanks[PADSIZE] = 438 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 439 static char zeroes[PADSIZE] = 440 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 441 442 /* 443 * BEWARE, these `goto error' on error, and PAD uses `n'. 444 */ 445 #define PRINT(ptr, len) { \ 446 iovp->iov_base = (ptr); \ 447 iovp->iov_len = (len); \ 448 uio.uio_resid += (len); \ 449 iovp++; \ 450 if (++uio.uio_iovcnt >= NIOV) { \ 451 if (__sprint(fp, &uio)) \ 452 goto error; \ 453 iovp = iov; \ 454 } \ 455 } 456 #define PAD(howmany, with) { \ 457 if ((n = (howmany)) > 0) { \ 458 while (n > PADSIZE) { \ 459 PRINT(with, PADSIZE); \ 460 n -= PADSIZE; \ 461 } \ 462 PRINT(with, n); \ 463 } \ 464 } 465 #define FLUSH() { \ 466 if (uio.uio_resid && __sprint(fp, &uio)) \ 467 goto error; \ 468 uio.uio_iovcnt = 0; \ 469 iovp = iov; \ 470 } 471 472 /* 473 * Get the argument indexed by nextarg. If the argument table is 474 * built, use it to get the argument. If its not, get the next 475 * argument (and arguments must be gotten sequentially). 476 */ 477 #define GETARG(type) \ 478 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 479 (nextarg++, va_arg(ap, type))) 480 481 /* 482 * To extend shorts properly, we need both signed and unsigned 483 * argument extraction methods. 484 */ 485 #define SARG() \ 486 (flags&LONGINT ? GETARG(long) : \ 487 flags&SHORTINT ? (long)(short)GETARG(int) : \ 488 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 489 (long)GETARG(int)) 490 #define UARG() \ 491 (flags&LONGINT ? GETARG(u_long) : \ 492 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 493 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 494 (u_long)GETARG(u_int)) 495 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 496 #define SJARG() \ 497 (flags&INTMAXT ? GETARG(intmax_t) : \ 498 flags&SIZET ? (intmax_t)GETARG(size_t) : \ 499 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 500 (intmax_t)GETARG(long long)) 501 #define UJARG() \ 502 (flags&INTMAXT ? GETARG(uintmax_t) : \ 503 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 504 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 505 (uintmax_t)GETARG(unsigned long long)) 506 507 /* 508 * Get * arguments, including the form *nn$. Preserve the nextarg 509 * that the argument can be gotten once the type is determined. 510 */ 511 #define GETASTER(val) \ 512 n2 = 0; \ 513 cp = fmt; \ 514 while (is_digit(*cp)) { \ 515 n2 = 10 * n2 + to_digit(*cp); \ 516 cp++; \ 517 } \ 518 if (*cp == '$') { \ 519 int hold = nextarg; \ 520 if (argtable == NULL) { \ 521 argtable = statargtable; \ 522 __find_arguments (fmt0, orgap, &argtable); \ 523 } \ 524 nextarg = n2; \ 525 val = GETARG (int); \ 526 nextarg = hold; \ 527 fmt = ++cp; \ 528 } else { \ 529 val = GETARG (int); \ 530 } 531 532 533 thousands_sep = '\0'; 534 grouping = NULL; 535 #ifdef FLOATING_POINT 536 dtoaresult = NULL; 537 decimal_point = localeconv()->decimal_point; 538 #endif 539 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 540 if (cantwrite(fp)) 541 return (EOF); 542 543 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 544 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 545 fp->_file >= 0) 546 return (__sbprintf(fp, fmt0, ap)); 547 548 fmt = (char *)fmt0; 549 argtable = NULL; 550 nextarg = 1; 551 orgap = ap; 552 uio.uio_iov = iovp = iov; 553 uio.uio_resid = 0; 554 uio.uio_iovcnt = 0; 555 ret = 0; 556 557 /* 558 * Scan the format for conversions (`%' character). 559 */ 560 for (;;) { 561 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 562 /* void */; 563 if ((n = fmt - cp) != 0) { 564 if ((unsigned)ret + n > INT_MAX) { 565 ret = EOF; 566 goto error; 567 } 568 PRINT(cp, n); 569 ret += n; 570 } 571 if (ch == '\0') 572 goto done; 573 fmt++; /* skip over '%' */ 574 575 flags = 0; 576 dprec = 0; 577 width = 0; 578 prec = -1; 579 sign = '\0'; 580 581 rflag: ch = *fmt++; 582 reswitch: switch (ch) { 583 case ' ': 584 /*- 585 * ``If the space and + flags both appear, the space 586 * flag will be ignored.'' 587 * -- ANSI X3J11 588 */ 589 if (!sign) 590 sign = ' '; 591 goto rflag; 592 case '#': 593 flags |= ALT; 594 goto rflag; 595 case '*': 596 /*- 597 * ``A negative field width argument is taken as a 598 * - flag followed by a positive field width.'' 599 * -- ANSI X3J11 600 * They don't exclude field widths read from args. 601 */ 602 GETASTER (width); 603 if (width >= 0) 604 goto rflag; 605 width = -width; 606 /* FALLTHROUGH */ 607 case '-': 608 flags |= LADJUST; 609 goto rflag; 610 case '+': 611 sign = '+'; 612 goto rflag; 613 case '\'': 614 flags |= GROUPING; 615 thousands_sep = *(localeconv()->thousands_sep); 616 grouping = localeconv()->grouping; 617 goto rflag; 618 case '.': 619 if ((ch = *fmt++) == '*') { 620 GETASTER (n); 621 prec = n < 0 ? -1 : n; 622 goto rflag; 623 } 624 n = 0; 625 while (is_digit(ch)) { 626 n = 10 * n + to_digit(ch); 627 ch = *fmt++; 628 } 629 prec = n < 0 ? -1 : n; 630 goto reswitch; 631 case '0': 632 /*- 633 * ``Note that 0 is taken as a flag, not as the 634 * beginning of a field width.'' 635 * -- ANSI X3J11 636 */ 637 flags |= ZEROPAD; 638 goto rflag; 639 case '1': case '2': case '3': case '4': 640 case '5': case '6': case '7': case '8': case '9': 641 n = 0; 642 do { 643 n = 10 * n + to_digit(ch); 644 ch = *fmt++; 645 } while (is_digit(ch)); 646 if (ch == '$') { 647 nextarg = n; 648 if (argtable == NULL) { 649 argtable = statargtable; 650 __find_arguments (fmt0, orgap, 651 &argtable); 652 } 653 goto rflag; 654 } 655 width = n; 656 goto reswitch; 657 #ifdef FLOATING_POINT 658 case 'L': 659 flags |= LONGDBL; 660 goto rflag; 661 #endif 662 case 'h': 663 if (flags & SHORTINT) { 664 flags &= ~SHORTINT; 665 flags |= CHARINT; 666 } else 667 flags |= SHORTINT; 668 goto rflag; 669 case 'j': 670 flags |= INTMAXT; 671 goto rflag; 672 case 'l': 673 if (flags & LONGINT) { 674 flags &= ~LONGINT; 675 flags |= LLONGINT; 676 } else 677 flags |= LONGINT; 678 goto rflag; 679 case 'q': 680 flags |= LLONGINT; /* not necessarily */ 681 goto rflag; 682 case 't': 683 flags |= PTRDIFFT; 684 goto rflag; 685 case 'z': 686 flags |= SIZET; 687 goto rflag; 688 case 'c': 689 *(cp = buf) = GETARG(int); 690 size = 1; 691 sign = '\0'; 692 break; 693 case 'D': 694 flags |= LONGINT; 695 /*FALLTHROUGH*/ 696 case 'd': 697 case 'i': 698 if (flags & INTMAX_SIZE) { 699 ujval = SJARG(); 700 if ((intmax_t)ujval < 0) { 701 ujval = -ujval; 702 sign = '-'; 703 } 704 } else { 705 ulval = SARG(); 706 if ((long)ulval < 0) { 707 ulval = -ulval; 708 sign = '-'; 709 } 710 } 711 base = 10; 712 goto number; 713 #ifdef FLOATING_POINT 714 #ifdef HEXFLOAT 715 case 'a': 716 case 'A': 717 #endif 718 case 'e': 719 case 'E': 720 /*- 721 * Grouping apply to %i, %d, %u, %f, %F, %g, %G 722 * conversion specifiers only. For other conversions 723 * behavior is undefined. 724 * -- POSIX 725 */ 726 flags &= ~GROUPING; 727 /*FALLTHROUGH*/ 728 case 'f': 729 case 'F': 730 goto fp_begin; 731 case 'g': 732 case 'G': 733 if (prec == 0) 734 prec = 1; 735 fp_begin: if (prec == -1) 736 prec = DEFPREC; 737 if (flags & LONGDBL) 738 /* XXX this loses precision. */ 739 _double = (double)GETARG(long double); 740 else 741 _double = GETARG(double); 742 /* do this before tricky precision changes */ 743 if (isinf(_double)) { 744 if (_double < 0) 745 sign = '-'; 746 if (isupper(ch)) 747 cp = "INF"; 748 else 749 cp = "inf"; 750 size = 3; 751 break; 752 } 753 if (isnan(_double)) { 754 if (isupper(ch)) 755 cp = "NAN"; 756 else 757 cp = "nan"; 758 size = 3; 759 break; 760 } 761 flags |= FPT; 762 if (dtoaresult != NULL) { 763 free(dtoaresult); 764 dtoaresult = NULL; 765 } 766 cp = cvt(_double, prec, flags, &softsign, 767 &expt, ch, &ndig, &dtoaresult); 768 if (ch == 'g' || ch == 'G') { 769 if (expt <= -4 || expt > prec) 770 ch = (ch == 'g') ? 'e' : 'E'; 771 else 772 ch = 'g'; 773 } 774 if (ch == 'e' || ch == 'E') { 775 --expt; 776 expsize = exponent(expstr, expt, ch); 777 size = expsize + ndig; 778 if (ndig > 1 || flags & ALT) 779 ++size; 780 } else if (ch == 'f' || ch == 'F') { 781 if (expt > 0) { 782 size = expt; 783 if (prec || flags & ALT) 784 size += prec + 1; 785 } else /* "0.X" */ 786 size = prec + 2; 787 } else if (expt >= ndig) { /* fixed g fmt */ 788 size = expt; 789 if (flags & ALT) 790 ++size; 791 } else 792 size = ndig + (expt > 0 ? 793 1 : 2 - expt); 794 795 if (softsign) 796 sign = '-'; 797 break; 798 #endif /* FLOATING_POINT */ 799 case 'n': 800 /* 801 * Assignment-like behavior is specified if the 802 * value overflows or is otherwise unrepresentable. 803 * C99 says to use `signed char' for %hhn conversions. 804 */ 805 if (flags & LLONGINT) 806 *GETARG(long long *) = ret; 807 else if (flags & SIZET) 808 *GETARG(ssize_t *) = (ssize_t)ret; 809 else if (flags & PTRDIFFT) 810 *GETARG(ptrdiff_t *) = ret; 811 else if (flags & INTMAXT) 812 *GETARG(intmax_t *) = ret; 813 else if (flags & LONGINT) 814 *GETARG(long *) = ret; 815 else if (flags & SHORTINT) 816 *GETARG(short *) = ret; 817 else if (flags & CHARINT) 818 *GETARG(signed char *) = ret; 819 else 820 *GETARG(int *) = ret; 821 continue; /* no output */ 822 case 'O': 823 flags |= LONGINT; 824 /*FALLTHROUGH*/ 825 case 'o': 826 if (flags & INTMAX_SIZE) 827 ujval = UJARG(); 828 else 829 ulval = UARG(); 830 base = 8; 831 goto nosign; 832 case 'p': 833 /*- 834 * ``The argument shall be a pointer to void. The 835 * value of the pointer is converted to a sequence 836 * of printable characters, in an implementation- 837 * defined manner.'' 838 * -- ANSI X3J11 839 */ 840 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 841 base = 16; 842 xdigs = "0123456789abcdef"; 843 flags = flags | INTMAXT | HEXPREFIX; 844 ch = 'x'; 845 goto nosign; 846 case 's': 847 if ((cp = GETARG(char *)) == NULL) 848 cp = "(null)"; 849 if (prec >= 0) { 850 /* 851 * can't use strlen; can only look for the 852 * NUL in the first `prec' characters, and 853 * strlen() will go further. 854 */ 855 char *p = memchr(cp, 0, (size_t)prec); 856 857 if (p != NULL) { 858 size = p - cp; 859 if (size > prec) 860 size = prec; 861 } else 862 size = prec; 863 } else 864 size = strlen(cp); 865 sign = '\0'; 866 break; 867 case 'U': 868 flags |= LONGINT; 869 /*FALLTHROUGH*/ 870 case 'u': 871 if (flags & INTMAX_SIZE) 872 ujval = UJARG(); 873 else 874 ulval = UARG(); 875 base = 10; 876 goto nosign; 877 case 'X': 878 xdigs = "0123456789ABCDEF"; 879 goto hex; 880 case 'x': 881 xdigs = "0123456789abcdef"; 882 hex: 883 if (flags & INTMAX_SIZE) 884 ujval = UJARG(); 885 else 886 ulval = UARG(); 887 base = 16; 888 /* leading 0x/X only if non-zero */ 889 if (flags & ALT && 890 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 891 flags |= HEXPREFIX; 892 893 flags &= ~GROUPING; 894 /* unsigned conversions */ 895 nosign: sign = '\0'; 896 /*- 897 * ``... diouXx conversions ... if a precision is 898 * specified, the 0 flag will be ignored.'' 899 * -- ANSI X3J11 900 */ 901 number: if ((dprec = prec) >= 0) 902 flags &= ~ZEROPAD; 903 904 /*- 905 * ``The result of converting a zero value with an 906 * explicit precision of zero is no characters.'' 907 * -- ANSI X3J11 908 */ 909 cp = buf + BUF; 910 if (flags & INTMAX_SIZE) { 911 if (ujval != 0 || prec != 0) 912 cp = __ujtoa(ujval, cp, base, 913 flags & ALT, xdigs, 914 flags & GROUPING, thousands_sep, 915 grouping); 916 } else { 917 if (ulval != 0 || prec != 0) 918 cp = __ultoa(ulval, cp, base, 919 flags & ALT, xdigs, 920 flags & GROUPING, thousands_sep, 921 grouping); 922 } 923 size = buf + BUF - cp; 924 break; 925 default: /* "%?" prints ?, unless ? is NUL */ 926 if (ch == '\0') 927 goto done; 928 /* pretend it was %c with argument ch */ 929 cp = buf; 930 *cp = ch; 931 size = 1; 932 sign = '\0'; 933 break; 934 } 935 936 /* 937 * All reasonable formats wind up here. At this point, `cp' 938 * points to a string which (if not flags&LADJUST) should be 939 * padded out to `width' places. If flags&ZEROPAD, it should 940 * first be prefixed by any sign or other prefix; otherwise, 941 * it should be blank padded before the prefix is emitted. 942 * After any left-hand padding and prefixing, emit zeroes 943 * required by a decimal [diouxX] precision, then print the 944 * string proper, then emit zeroes required by any leftover 945 * floating precision; finally, if LADJUST, pad with blanks. 946 * 947 * Compute actual size, so we know how much to pad. 948 * size excludes decimal prec; realsz includes it. 949 */ 950 realsz = dprec > size ? dprec : size; 951 if (sign) 952 realsz++; 953 else if (flags & HEXPREFIX) 954 realsz += 2; 955 956 prsize = width > realsz ? width : realsz; 957 if ((unsigned)ret + prsize > INT_MAX) { 958 ret = EOF; 959 goto error; 960 } 961 962 /* right-adjusting blank padding */ 963 if ((flags & (LADJUST|ZEROPAD)) == 0) 964 PAD(width - realsz, blanks); 965 966 /* prefix */ 967 if (sign) { 968 PRINT(&sign, 1); 969 } else if (flags & HEXPREFIX) { 970 ox[0] = '0'; 971 ox[1] = ch; 972 PRINT(ox, 2); 973 } 974 975 /* right-adjusting zero padding */ 976 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 977 PAD(width - realsz, zeroes); 978 979 /* leading zeroes from decimal precision */ 980 PAD(dprec - size, zeroes); 981 982 /* the string or number proper */ 983 #ifdef FLOATING_POINT 984 if ((flags & FPT) == 0) { 985 PRINT(cp, size); 986 } else { /* glue together f_p fragments */ 987 if (ch >= 'f') { /* 'f' or 'g' */ 988 if (_double == 0) { 989 /* kludge for __dtoa irregularity */ 990 PRINT("0", 1); 991 if (expt < ndig || (flags & ALT) != 0) { 992 PRINT(decimal_point, 1); 993 PAD(ndig - 1, zeroes); 994 } 995 } else if (expt <= 0) { 996 PRINT("0", 1); 997 PRINT(decimal_point, 1); 998 PAD(-expt, zeroes); 999 PRINT(cp, ndig); 1000 } else if (expt >= ndig) { 1001 PRINT(cp, ndig); 1002 PAD(expt - ndig, zeroes); 1003 if (flags & ALT) 1004 PRINT(decimal_point, 1); 1005 } else { 1006 PRINT(cp, expt); 1007 cp += expt; 1008 PRINT(decimal_point, 1); 1009 PRINT(cp, ndig-expt); 1010 } 1011 } else { /* 'e' or 'E' */ 1012 if (ndig > 1 || flags & ALT) { 1013 ox[0] = *cp++; 1014 ox[1] = *decimal_point; 1015 PRINT(ox, 2); 1016 if (_double) { 1017 PRINT(cp, ndig-1); 1018 } else /* 0.[0..] */ 1019 /* __dtoa irregularity */ 1020 PAD(ndig - 1, zeroes); 1021 } else /* XeYYY */ 1022 PRINT(cp, 1); 1023 PRINT(expstr, expsize); 1024 } 1025 } 1026 #else 1027 PRINT(cp, size); 1028 #endif 1029 /* left-adjusting padding (always blank) */ 1030 if (flags & LADJUST) 1031 PAD(width - realsz, blanks); 1032 1033 /* finally, adjust ret */ 1034 ret += prsize; 1035 1036 FLUSH(); /* copy out the I/O vectors */ 1037 } 1038 done: 1039 FLUSH(); 1040 error: 1041 #ifdef FLOATING_POINT 1042 if (dtoaresult != NULL) 1043 free(dtoaresult); 1044 #endif 1045 if (__sferror(fp)) 1046 ret = EOF; 1047 if ((argtable != NULL) && (argtable != statargtable)) 1048 free (argtable); 1049 return (ret); 1050 /* NOTREACHED */ 1051 } 1052 1053 /* 1054 * Find all arguments when a positional parameter is encountered. Returns a 1055 * table, indexed by argument number, of pointers to each arguments. The 1056 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 1057 * It will be replaces with a malloc-ed one if it overflows. 1058 */ 1059 static void 1060 __find_arguments (const char *fmt0, va_list ap, union arg **argtable) 1061 { 1062 char *fmt; /* format string */ 1063 int ch; /* character from fmt */ 1064 int n, n2; /* handy integer (short term usage) */ 1065 char *cp; /* handy char pointer (short term usage) */ 1066 int flags; /* flags as above */ 1067 int width; /* width from format (%8d), or 0 */ 1068 enum typeid *typetable; /* table of types */ 1069 enum typeid stattypetable [STATIC_ARG_TBL_SIZE]; 1070 int tablesize; /* current size of type table */ 1071 int tablemax; /* largest used index in table */ 1072 int nextarg; /* 1-based argument index */ 1073 1074 /* 1075 * Add an argument type to the table, expanding if necessary. 1076 */ 1077 #define ADDTYPE(type) \ 1078 ((nextarg >= tablesize) ? \ 1079 __grow_type_table(nextarg, &typetable, &tablesize) : 0, \ 1080 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 1081 typetable[nextarg++] = type) 1082 1083 #define ADDSARG() \ 1084 ((flags&INTMAXT) ? ADDTYPE(T_INTMAXT) : \ 1085 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1086 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1087 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 1088 ((flags&LONGINT) ? ADDTYPE(T_LONG) : ADDTYPE(T_INT)))))) 1089 1090 #define ADDUARG() \ 1091 ((flags&INTMAXT) ? ADDTYPE(T_UINTMAXT) : \ 1092 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1093 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1094 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 1095 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : ADDTYPE(T_U_INT)))))) 1096 1097 /* 1098 * Add * arguments to the type array. 1099 */ 1100 #define ADDASTER() \ 1101 n2 = 0; \ 1102 cp = fmt; \ 1103 while (is_digit(*cp)) { \ 1104 n2 = 10 * n2 + to_digit(*cp); \ 1105 cp++; \ 1106 } \ 1107 if (*cp == '$') { \ 1108 int hold = nextarg; \ 1109 nextarg = n2; \ 1110 ADDTYPE (T_INT); \ 1111 nextarg = hold; \ 1112 fmt = ++cp; \ 1113 } else { \ 1114 ADDTYPE (T_INT); \ 1115 } 1116 fmt = (char *)fmt0; 1117 typetable = stattypetable; 1118 tablesize = STATIC_ARG_TBL_SIZE; 1119 tablemax = 0; 1120 nextarg = 1; 1121 memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 1122 1123 /* 1124 * Scan the format for conversions (`%' character). 1125 */ 1126 for (;;) { 1127 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 1128 /* void */; 1129 if (ch == '\0') 1130 goto done; 1131 fmt++; /* skip over '%' */ 1132 1133 flags = 0; 1134 width = 0; 1135 1136 rflag: ch = *fmt++; 1137 reswitch: switch (ch) { 1138 case ' ': 1139 case '#': 1140 goto rflag; 1141 case '*': 1142 ADDASTER (); 1143 goto rflag; 1144 case '-': 1145 case '+': 1146 case '\'': 1147 goto rflag; 1148 case '.': 1149 if ((ch = *fmt++) == '*') { 1150 ADDASTER (); 1151 goto rflag; 1152 } 1153 while (is_digit(ch)) { 1154 ch = *fmt++; 1155 } 1156 goto reswitch; 1157 case '0': 1158 goto rflag; 1159 case '1': case '2': case '3': case '4': 1160 case '5': case '6': case '7': case '8': case '9': 1161 n = 0; 1162 do { 1163 n = 10 * n + to_digit(ch); 1164 ch = *fmt++; 1165 } while (is_digit(ch)); 1166 if (ch == '$') { 1167 nextarg = n; 1168 goto rflag; 1169 } 1170 width = n; 1171 goto reswitch; 1172 #ifdef FLOATING_POINT 1173 case 'L': 1174 flags |= LONGDBL; 1175 goto rflag; 1176 #endif 1177 case 'h': 1178 if (flags & SHORTINT) { 1179 flags &= ~SHORTINT; 1180 flags |= CHARINT; 1181 } else 1182 flags |= SHORTINT; 1183 goto rflag; 1184 case 'j': 1185 flags |= INTMAXT; 1186 goto rflag; 1187 case 'l': 1188 if (flags & LONGINT) { 1189 flags &= ~LONGINT; 1190 flags |= LLONGINT; 1191 } else 1192 flags |= LONGINT; 1193 goto rflag; 1194 case 'q': 1195 flags |= LLONGINT; /* not necessarily */ 1196 goto rflag; 1197 case 't': 1198 flags |= PTRDIFFT; 1199 goto rflag; 1200 case 'z': 1201 flags |= SIZET; 1202 goto rflag; 1203 case 'c': 1204 ADDTYPE(T_INT); 1205 break; 1206 case 'D': 1207 flags |= LONGINT; 1208 /*FALLTHROUGH*/ 1209 case 'd': 1210 case 'i': 1211 ADDSARG(); 1212 break; 1213 #ifdef FLOATING_POINT 1214 #ifdef HEXFLOAT 1215 case 'a': 1216 case 'A': 1217 #endif 1218 case 'e': 1219 case 'E': 1220 case 'f': 1221 case 'g': 1222 case 'G': 1223 if (flags & LONGDBL) 1224 ADDTYPE(T_LONG_DOUBLE); 1225 else 1226 ADDTYPE(T_DOUBLE); 1227 break; 1228 #endif /* FLOATING_POINT */ 1229 case 'n': 1230 if (flags & INTMAXT) 1231 ADDTYPE(TP_INTMAXT); 1232 else if (flags & PTRDIFFT) 1233 ADDTYPE(TP_PTRDIFFT); 1234 else if (flags & SIZET) 1235 ADDTYPE(TP_SIZET); 1236 else if (flags & LLONGINT) 1237 ADDTYPE(TP_LLONG); 1238 else if (flags & LONGINT) 1239 ADDTYPE(TP_LONG); 1240 else if (flags & SHORTINT) 1241 ADDTYPE(TP_SHORT); 1242 else if (flags & CHARINT) 1243 ADDTYPE(TP_SCHAR); 1244 else 1245 ADDTYPE(TP_INT); 1246 continue; /* no output */ 1247 case 'O': 1248 flags |= LONGINT; 1249 /*FALLTHROUGH*/ 1250 case 'o': 1251 ADDUARG(); 1252 break; 1253 case 'p': 1254 ADDTYPE(TP_VOID); 1255 break; 1256 case 's': 1257 ADDTYPE(TP_CHAR); 1258 break; 1259 case 'U': 1260 flags |= LONGINT; 1261 /*FALLTHROUGH*/ 1262 case 'u': 1263 case 'X': 1264 case 'x': 1265 ADDUARG(); 1266 break; 1267 default: /* "%?" prints ?, unless ? is NUL */ 1268 if (ch == '\0') 1269 goto done; 1270 break; 1271 } 1272 } 1273 done: 1274 /* 1275 * Build the argument table. 1276 */ 1277 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1278 *argtable = (union arg *) 1279 malloc (sizeof (union arg) * (tablemax + 1)); 1280 } 1281 1282 (*argtable) [0].intarg = 0; 1283 for (n = 1; n <= tablemax; n++) { 1284 switch (typetable [n]) { 1285 case T_UNUSED: /* whoops! */ 1286 (*argtable) [n].intarg = va_arg (ap, int); 1287 break; 1288 case TP_SCHAR: 1289 (*argtable) [n].pschararg = va_arg (ap, signed char *); 1290 break; 1291 case TP_SHORT: 1292 (*argtable) [n].pshortarg = va_arg (ap, short *); 1293 break; 1294 case T_INT: 1295 (*argtable) [n].intarg = va_arg (ap, int); 1296 break; 1297 case T_U_INT: 1298 (*argtable) [n].uintarg = va_arg (ap, unsigned int); 1299 break; 1300 case TP_INT: 1301 (*argtable) [n].pintarg = va_arg (ap, int *); 1302 break; 1303 case T_LONG: 1304 (*argtable) [n].longarg = va_arg (ap, long); 1305 break; 1306 case T_U_LONG: 1307 (*argtable) [n].ulongarg = va_arg (ap, unsigned long); 1308 break; 1309 case TP_LONG: 1310 (*argtable) [n].plongarg = va_arg (ap, long *); 1311 break; 1312 case T_LLONG: 1313 (*argtable) [n].longlongarg = va_arg (ap, long long); 1314 break; 1315 case T_U_LLONG: 1316 (*argtable) [n].ulonglongarg = va_arg (ap, unsigned long long); 1317 break; 1318 case TP_LLONG: 1319 (*argtable) [n].plonglongarg = va_arg (ap, long long *); 1320 break; 1321 case T_PTRDIFFT: 1322 (*argtable) [n].ptrdiffarg = va_arg (ap, ptrdiff_t); 1323 break; 1324 case TP_PTRDIFFT: 1325 (*argtable) [n].pptrdiffarg = va_arg (ap, ptrdiff_t *); 1326 break; 1327 case T_SIZET: 1328 (*argtable) [n].sizearg = va_arg (ap, size_t); 1329 break; 1330 case TP_SIZET: 1331 (*argtable) [n].psizearg = va_arg (ap, ssize_t *); 1332 break; 1333 case T_INTMAXT: 1334 (*argtable) [n].intmaxarg = va_arg (ap, intmax_t); 1335 break; 1336 case T_UINTMAXT: 1337 (*argtable) [n].uintmaxarg = va_arg (ap, uintmax_t); 1338 break; 1339 case TP_INTMAXT: 1340 (*argtable) [n].pintmaxarg = va_arg (ap, intmax_t *); 1341 break; 1342 #ifdef FLOATING_POINT 1343 case T_DOUBLE: 1344 (*argtable) [n].doublearg = va_arg (ap, double); 1345 break; 1346 case T_LONG_DOUBLE: 1347 (*argtable) [n].longdoublearg = va_arg (ap, long double); 1348 break; 1349 #endif 1350 case TP_CHAR: 1351 (*argtable) [n].pchararg = va_arg (ap, char *); 1352 break; 1353 case TP_VOID: 1354 (*argtable) [n].pvoidarg = va_arg (ap, void *); 1355 break; 1356 } 1357 } 1358 1359 if ((typetable != NULL) && (typetable != stattypetable)) 1360 free (typetable); 1361 } 1362 1363 /* 1364 * Increase the size of the type table. 1365 */ 1366 static void 1367 __grow_type_table (int nextarg, enum typeid **typetable, int *tablesize) 1368 { 1369 enum typeid *const oldtable = *typetable; 1370 const int oldsize = *tablesize; 1371 enum typeid *newtable; 1372 int newsize = oldsize * 2; 1373 1374 if (newsize < nextarg + 1) 1375 newsize = nextarg + 1; 1376 if (oldsize == STATIC_ARG_TBL_SIZE) { 1377 if ((newtable = malloc(newsize)) == NULL) 1378 abort(); /* XXX handle better */ 1379 bcopy(oldtable, newtable, oldsize); 1380 } else { 1381 if ((newtable = reallocf(oldtable, newsize)) == NULL) 1382 abort(); /* XXX handle better */ 1383 } 1384 memset(&newtable[oldsize], T_UNUSED, newsize - oldsize); 1385 1386 *typetable = newtable; 1387 *tablesize = newsize; 1388 } 1389 1390 1391 #ifdef FLOATING_POINT 1392 1393 extern char *__dtoa(double, int, int, int *, int *, char **, char **); 1394 1395 static char * 1396 cvt(double value, int ndigits, int flags, char *sign, int *decpt, 1397 int ch, int *length, char **dtoaresultp) 1398 { 1399 int mode, dsgn; 1400 char *digits, *bp, *rve; 1401 1402 if (ch == 'f') 1403 mode = 3; /* ndigits after the decimal point */ 1404 else { 1405 /* 1406 * To obtain ndigits after the decimal point for the 'e' 1407 * and 'E' formats, round to ndigits + 1 significant 1408 * figures. 1409 */ 1410 if (ch == 'e' || ch == 'E') 1411 ndigits++; 1412 mode = 2; /* ndigits significant digits */ 1413 } 1414 if (value < 0) { 1415 value = -value; 1416 *sign = '-'; 1417 } else 1418 *sign = '\000'; 1419 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve, 1420 dtoaresultp); 1421 if ((ch != 'g' && ch != 'G') || flags & ALT) { 1422 /* print trailing zeros */ 1423 bp = digits + ndigits; 1424 if (ch == 'f') { 1425 if (*digits == '0' && value) 1426 *decpt = -ndigits + 1; 1427 bp += *decpt; 1428 } 1429 if (value == 0) /* kludge for __dtoa irregularity */ 1430 rve = bp; 1431 while (rve < bp) 1432 *rve++ = '0'; 1433 } 1434 *length = rve - digits; 1435 return (digits); 1436 } 1437 1438 static int 1439 exponent(char *p0, int exp, int fmtch) 1440 { 1441 char *p, *t; 1442 char expbuf[MAXEXP]; 1443 1444 p = p0; 1445 *p++ = fmtch; 1446 if (exp < 0) { 1447 exp = -exp; 1448 *p++ = '-'; 1449 } 1450 else 1451 *p++ = '+'; 1452 t = expbuf + MAXEXP; 1453 if (exp > 9) { 1454 do { 1455 *--t = to_char(exp % 10); 1456 } while ((exp /= 10) > 9); 1457 *--t = to_char(exp); 1458 for (; t < expbuf + MAXEXP; *p++ = *t++); 1459 } 1460 else { 1461 *p++ = '0'; 1462 *p++ = to_char(exp); 1463 } 1464 return (p - p0); 1465 } 1466 #endif /* FLOATING_POINT */ 1467