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 * @(#)vfprintf.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/stdio/vfprintf.c,v 1.34 2001/12/13 19:45:41 phantom Exp $ 38 * $DragonFly: src/lib/libc/stdio/vfprintf.c,v 1.13 2005/08/01 22:50:45 joerg Exp $ 39 */ 40 41 /* 42 * Actual printf innards. 43 * 44 * This code is large and complicated... 45 */ 46 47 #include "namespace.h" 48 #include <sys/types.h> 49 50 #include <ctype.h> 51 #include <limits.h> 52 #include <locale.h> 53 #include <stddef.h> 54 #include <stdint.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 59 #include <stdarg.h> 60 #include "un-namespace.h" 61 62 #include "libc_private.h" 63 #include "local.h" 64 #include "priv_stdio.h" 65 66 /* Borrowed from sys/systm.h, which is _KERNEL-only: */ 67 #define CTASSERT(x) _CTASSERT(x, __LINE__) 68 #define _CTASSERT(x, y) __CTASSERT(x, y) 69 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 70 71 /* This code assumes that a quad_t can fit in a long long: */ 72 CTASSERT(sizeof(quad_t) == sizeof(long long)); 73 74 union arg { 75 int intarg; 76 unsigned int uintarg; 77 long longarg; 78 unsigned long ulongarg; 79 long long longlongarg; 80 unsigned long long ulonglongarg; 81 ptrdiff_t ptrdiffarg; 82 size_t sizearg; 83 intmax_t intmaxarg; 84 uintmax_t uintmaxarg; 85 void *pvoidarg; 86 char *pchararg; 87 signed char *pschararg; 88 short *pshortarg; 89 int *pintarg; 90 long *plongarg; 91 long long *plonglongarg; 92 ptrdiff_t *pptrdiffarg; 93 size_t *psizearg; 94 intmax_t *pintmaxarg; 95 #ifndef NO_FLOATING_POINT 96 double doublearg; 97 long double longdoublearg; 98 #endif 99 }; 100 101 /* 102 * Type ids for argument type table. 103 */ 104 enum typeid { 105 T_UNUSED, TP_SHORT, T_INT, T_U_INT, TP_INT, 106 T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG, 107 T_PTRDIFFT, TP_PTRDIFFT, T_SIZET, TP_SIZET, 108 T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR, 109 T_DOUBLE, T_LONG_DOUBLE 110 }; 111 112 static int __sprint(FILE *, struct __suio *); 113 static int __sbprintf(FILE *, const char *, va_list) __printflike(2, 0); 114 static char * __ujtoa(uintmax_t, char *, int, int, const char *, int, 115 char, const char *); 116 static char * __ultoa(u_long, char *, int, int, const char *, int, 117 char, const char *); 118 static void __find_arguments(const char *, va_list, union arg **); 119 static void __grow_type_table(int, enum typeid **, int *); 120 121 /* 122 * Flush out all the vectors defined by the given uio, 123 * then reset it so that it can be reused. 124 */ 125 static int 126 __sprint(FILE *fp, struct __suio *uio) 127 { 128 int err; 129 130 if (uio->uio_resid == 0) { 131 uio->uio_iovcnt = 0; 132 return (0); 133 } 134 err = __sfvwrite(fp, uio); 135 uio->uio_resid = 0; 136 uio->uio_iovcnt = 0; 137 return (err); 138 } 139 140 /* 141 * Helper function for `fprintf to unbuffered unix file': creates a 142 * temporary buffer. We only work on write-only files; this avoids 143 * worries about ungetc buffers and so forth. 144 */ 145 static int 146 __sbprintf(FILE *fp, const char *fmt, va_list ap) 147 { 148 int ret; 149 FILE fake; 150 unsigned char buf[BUFSIZ]; 151 152 /* copy the important variables */ 153 fake.pub._flags = fp->pub._flags & ~__SNBF; 154 fake.pub._fileno = fp->pub._fileno; 155 fake._cookie = fp->_cookie; 156 fake._write = fp->_write; 157 158 fake._up = fp->_up; 159 fake.fl_mutex = fp->fl_mutex; 160 fake.fl_owner = fp->fl_owner; 161 fake.fl_count = fp->fl_count; 162 163 /* set up the buffer */ 164 fake._bf._base = fake.pub._p = buf; 165 fake._bf._size = fake.pub._w = sizeof(buf); 166 fake.pub._lbfsize = 0; /* not actually used, but Just In Case */ 167 168 /* do the work, then copy any error status */ 169 ret = __vfprintf(&fake, fmt, ap); 170 if (ret >= 0 && __fflush(&fake)) 171 ret = EOF; 172 if (fake.pub._flags & __SERR) 173 fp->pub._flags |= __SERR; 174 return (ret); 175 } 176 177 /* 178 * Macros for converting digits to letters and vice versa 179 */ 180 #define to_digit(c) ((c) - '0') 181 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 182 #define to_char(n) ((n) + '0') 183 184 /* 185 * Convert an unsigned long to ASCII for printf purposes, returning 186 * a pointer to the first character of the string representation. 187 * Octal numbers can be forced to have a leading zero; hex numbers 188 * use the given digits. 189 */ 190 static char * 191 __ultoa(u_long val, char *endp, int base, int octzero, const char *xdigs, 192 int needgrp, char thousep, const char *grp) 193 { 194 char *cp = endp; 195 long sval; 196 int ndig; 197 198 /* 199 * Handle the three cases separately, in the hope of getting 200 * better/faster code. 201 */ 202 switch (base) { 203 case 10: 204 if (val < 10) { /* many numbers are 1 digit */ 205 *--cp = to_char(val); 206 return (cp); 207 } 208 ndig = 0; 209 /* 210 * On many machines, unsigned arithmetic is harder than 211 * signed arithmetic, so we do at most one unsigned mod and 212 * divide; this is sufficient to reduce the range of 213 * the incoming value to where signed arithmetic works. 214 */ 215 if (val > LONG_MAX) { 216 *--cp = to_char(val % 10); 217 ndig++; 218 sval = val / 10; 219 } else 220 sval = val; 221 do { 222 *--cp = to_char(sval % 10); 223 ndig++; 224 /* 225 * If (*grp == CHAR_MAX) then no more grouping 226 * should be performed. 227 */ 228 if (needgrp && ndig == *grp && *grp != CHAR_MAX && 229 sval > 9) { 230 *--cp = thousep; 231 ndig = 0; 232 /* 233 * If (*(grp+1) == '\0') then we have to 234 * use *grp character (last grouping rule) 235 * for all next cases 236 */ 237 if (*(grp + 1) != '\0') 238 grp++; 239 } 240 sval /= 10; 241 } while (sval != 0); 242 break; 243 244 case 8: 245 do { 246 *--cp = to_char(val & 7); 247 val >>= 3; 248 } while (val); 249 if (octzero && *cp != '0') 250 *--cp = '0'; 251 break; 252 253 case 16: 254 do { 255 *--cp = xdigs[(size_t)val & 15]; 256 val >>= 4; 257 } while (val); 258 break; 259 260 default: /* oops */ 261 abort(); 262 } 263 return (cp); 264 } 265 266 /* Identical to __ultoa, but for intmax_t. */ 267 static char * 268 __ujtoa(u_quad_t val, char *endp, int base, int octzero, const char *xdigs, 269 int needgrp, char thousep, const char *grp) 270 { 271 char *cp = endp; 272 intmax_t sval; 273 int ndig; 274 275 /* quick test for small values; __ultoa is typically much faster */ 276 /* (perhaps instead we should run until small, then call __ultoa?) */ 277 if (val <= ULONG_MAX) 278 return (__ultoa((u_long)val, endp, base, octzero, xdigs, 279 needgrp, thousep, grp)); 280 switch (base) { 281 case 10: 282 if (val < 10) { 283 *--cp = to_char(val % 10); 284 return (cp); 285 } 286 ndig = 0; 287 if (val > INTMAX_MAX) { 288 *--cp = to_char(val % 10); 289 ndig++; 290 sval = val / 10; 291 } else 292 sval = val; 293 do { 294 *--cp = to_char(sval % 10); 295 ndig++; 296 /* 297 * If (*grp == CHAR_MAX) then no more grouping 298 * should be performed. 299 */ 300 if (needgrp && *grp != CHAR_MAX && ndig == *grp && 301 sval > 9) { 302 *--cp = thousep; 303 ndig = 0; 304 /* 305 * If (*(grp+1) == '\0') then we have to 306 * use *grp character (last grouping rule) 307 * for all next cases 308 */ 309 if (*(grp + 1) != '\0') 310 grp++; 311 } 312 sval /= 10; 313 } while (sval != 0); 314 break; 315 316 case 8: 317 do { 318 *--cp = to_char(val & 7); 319 val >>= 3; 320 } while (val); 321 if (octzero && *cp != '0') 322 *--cp = '0'; 323 break; 324 325 case 16: 326 do { 327 *--cp = xdigs[(size_t)val & 15]; 328 val >>= 4; 329 } while (val); 330 break; 331 332 default: 333 abort(); 334 } 335 return (cp); 336 } 337 338 /* 339 * MT-safe version 340 */ 341 int 342 vfprintf(FILE *fp, const char *fmt0, va_list ap) 343 { 344 int ret; 345 346 FLOCKFILE(fp); 347 ret = __vfprintf(fp, fmt0, ap); 348 FUNLOCKFILE(fp); 349 return (ret); 350 } 351 352 #ifndef NO_FLOATING_POINT 353 #include <math.h> 354 #include "floatio.h" 355 356 #define BUF ((MAXEXPDIG * 2) + MAXFRACT + 1) /* + decimal point */ 357 #define DEFPREC 6 358 359 static char *cvt (double, int, int, char *, int *, int, int *, char **); 360 static int exponent (char *, int, int); 361 362 #else /* no NO_FLOATING_POINT */ 363 364 #define BUF 136 365 366 #endif /* NO_FLOATING_POINT */ 367 368 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 369 370 /* 371 * Flags used during conversion. 372 */ 373 #define ALT 0x001 /* alternate form */ 374 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 375 #define LADJUST 0x004 /* left adjustment */ 376 #define LONGDBL 0x008 /* long double */ 377 #define LONGINT 0x010 /* long integer */ 378 #define LLONGINT 0x020 /* long long integer */ 379 #define SHORTINT 0x040 /* short integer */ 380 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 381 #define FPT 0x100 /* Floating point number */ 382 #define GROUPING 0x200 /* use grouping ("'" flag) */ 383 /* C99 additional size modifiers: */ 384 #define SIZET 0x400 /* size_t */ 385 #define PTRDIFFT 0x800 /* ptrdiff_t */ 386 #define INTMAXT 0x1000 /* intmax_t */ 387 #define CHARINT 0x2000 /* print char using int format */ 388 /* 389 * Non-MT-safe version 390 */ 391 int 392 __vfprintf(FILE *fp, const char *fmt0, va_list ap) 393 { 394 char *fmt; /* format string */ 395 int ch; /* character from fmt */ 396 int n, n2; /* handy integer (short term usage) */ 397 char *cp; /* handy char pointer (short term usage) */ 398 struct __siov *iovp; /* for PRINT macro */ 399 int flags; /* flags as above */ 400 int ret; /* return value accumulator */ 401 int width; /* width from format (%8d), or 0 */ 402 int prec; /* precision from format (%.3d), or -1 */ 403 char sign; /* sign prefix (' ', '+', '-', or \0) */ 404 char thousands_sep; /* locale specific thousands separator */ 405 const char *grouping; /* locale specific numeric grouping rules */ 406 #ifndef NO_FLOATING_POINT 407 const char *decimal_point; /* locale specific decimal point */ 408 char softsign; /* temporary negative sign for floats */ 409 double _double; /* double precision arguments %[eEfgG] */ 410 int expt; /* integer value of exponent */ 411 int expsize; /* character count for expstr */ 412 int ndig; /* actual number of digits returned by cvt */ 413 char expstr[7]; /* buffer for exponent string */ 414 char *dtoaresult; /* buffer allocated by dtoa */ 415 #endif 416 u_long ulval; /* integer arguments %[diouxX] */ 417 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 418 int base; /* base for [diouxX] conversion */ 419 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 420 int realsz; /* field size expanded by dprec, sign, etc */ 421 int size; /* size of converted field or string */ 422 int prsize; /* max size of printed field */ 423 const char *xdigs; /* digits for [xX] conversion */ 424 #define NIOV 8 425 struct __suio uio; /* output information: summary */ 426 struct __siov iov[NIOV];/* ... and individual io vectors */ 427 char buf[BUF]; /* space for %c, %[diouxX], %[eEfFgG] */ 428 char ox[2]; /* space for 0x hex-prefix */ 429 union arg *argtable; /* args, built due to positional arg */ 430 union arg statargtable[STATIC_ARG_TBL_SIZE]; 431 int nextarg; /* 1-based argument index */ 432 va_list orgap; /* original argument pointer */ 433 434 /* 435 * Choose PADSIZE to trade efficiency vs. size. If larger printf 436 * fields occur frequently, increase PADSIZE and make the initialisers 437 * below longer. 438 */ 439 #define PADSIZE 16 /* pad chunk size */ 440 static char blanks[PADSIZE] = 441 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 442 static char zeroes[PADSIZE] = 443 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 444 445 /* 446 * BEWARE, these `goto error' on error, and PAD uses `n'. 447 */ 448 #define PRINT(ptr, len) { \ 449 iovp->iov_base = __DECONST(void *, ptr); \ 450 iovp->iov_len = (len); \ 451 uio.uio_resid += (len); \ 452 iovp++; \ 453 if (++uio.uio_iovcnt >= NIOV) { \ 454 if (__sprint(fp, &uio)) \ 455 goto error; \ 456 iovp = iov; \ 457 } \ 458 } 459 #define PAD(howmany, with) { \ 460 if ((n = (howmany)) > 0) { \ 461 while (n > PADSIZE) { \ 462 PRINT(with, PADSIZE); \ 463 n -= PADSIZE; \ 464 } \ 465 PRINT(with, n); \ 466 } \ 467 } 468 #define FLUSH() { \ 469 if (uio.uio_resid && __sprint(fp, &uio)) \ 470 goto error; \ 471 uio.uio_iovcnt = 0; \ 472 iovp = iov; \ 473 } 474 475 /* 476 * Get the argument indexed by nextarg. If the argument table is 477 * built, use it to get the argument. If its not, get the next 478 * argument (and arguments must be gotten sequentially). 479 */ 480 #define GETARG(type) \ 481 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 482 (nextarg++, va_arg(ap, type))) 483 484 /* 485 * To extend shorts properly, we need both signed and unsigned 486 * argument extraction methods. 487 */ 488 #define SARG() \ 489 (flags&LONGINT ? GETARG(long) : \ 490 flags&SHORTINT ? (long)(short)GETARG(int) : \ 491 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 492 (long)GETARG(int)) 493 #define UARG() \ 494 (flags&LONGINT ? GETARG(u_long) : \ 495 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 496 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 497 (u_long)GETARG(u_int)) 498 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 499 #define SJARG() \ 500 (flags&INTMAXT ? GETARG(intmax_t) : \ 501 flags&SIZET ? (intmax_t)GETARG(size_t) : \ 502 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 503 (intmax_t)GETARG(long long)) 504 #define UJARG() \ 505 (flags&INTMAXT ? GETARG(uintmax_t) : \ 506 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 507 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 508 (uintmax_t)GETARG(unsigned long long)) 509 510 /* 511 * Get * arguments, including the form *nn$. Preserve the nextarg 512 * that the argument can be gotten once the type is determined. 513 */ 514 #define GETASTER(val) \ 515 n2 = 0; \ 516 cp = fmt; \ 517 while (is_digit(*cp)) { \ 518 n2 = 10 * n2 + to_digit(*cp); \ 519 cp++; \ 520 } \ 521 if (*cp == '$') { \ 522 int hold = nextarg; \ 523 if (argtable == NULL) { \ 524 argtable = statargtable; \ 525 __find_arguments (fmt0, orgap, &argtable); \ 526 } \ 527 nextarg = n2; \ 528 val = GETARG (int); \ 529 nextarg = hold; \ 530 fmt = ++cp; \ 531 } else { \ 532 val = GETARG (int); \ 533 } 534 535 536 thousands_sep = '\0'; 537 grouping = NULL; 538 #ifndef NO_FLOATING_POINT 539 dtoaresult = NULL; 540 decimal_point = localeconv()->decimal_point; 541 #endif 542 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 543 if (cantwrite(fp)) { 544 return (EOF); 545 } 546 547 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 548 if ((fp->pub._flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 549 fp->pub._fileno >= 0) { 550 return (__sbprintf(fp, fmt0, ap)); 551 } 552 553 fmt = (char *)fmt0; 554 argtable = NULL; 555 nextarg = 1; 556 orgap = ap; 557 uio.uio_iov = iovp = iov; 558 uio.uio_resid = 0; 559 uio.uio_iovcnt = 0; 560 ret = 0; 561 562 /* 563 * Scan the format for conversions (`%' character). 564 */ 565 for (;;) { 566 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 567 /* void */; 568 if ((n = fmt - cp) != 0) { 569 if ((unsigned)ret + n > INT_MAX) { 570 ret = EOF; 571 goto error; 572 } 573 PRINT(cp, n); 574 ret += n; 575 } 576 if (ch == '\0') 577 goto done; 578 fmt++; /* skip over '%' */ 579 580 flags = 0; 581 dprec = 0; 582 width = 0; 583 prec = -1; 584 sign = '\0'; 585 586 rflag: ch = *fmt++; 587 reswitch: switch (ch) { 588 case ' ': 589 /* 590 * ``If the space and + flags both appear, the space 591 * flag will be ignored.'' 592 * -- ANSI X3J11 593 */ 594 if (!sign) 595 sign = ' '; 596 goto rflag; 597 case '#': 598 flags |= ALT; 599 goto rflag; 600 case '*': 601 /* 602 * ``A negative field width argument is taken as a 603 * - flag followed by a positive field width.'' 604 * -- ANSI X3J11 605 * They don't exclude field widths read from args. 606 */ 607 GETASTER (width); 608 if (width >= 0) 609 goto rflag; 610 width = -width; 611 /* FALLTHROUGH */ 612 case '-': 613 flags |= LADJUST; 614 goto rflag; 615 case '+': 616 sign = '+'; 617 goto rflag; 618 case '\'': 619 flags |= GROUPING; 620 thousands_sep = *(localeconv()->thousands_sep); 621 grouping = localeconv()->grouping; 622 goto rflag; 623 case '.': 624 if ((ch = *fmt++) == '*') { 625 GETASTER (n); 626 prec = n < 0 ? -1 : n; 627 goto rflag; 628 } 629 n = 0; 630 while (is_digit(ch)) { 631 n = 10 * n + to_digit(ch); 632 ch = *fmt++; 633 } 634 prec = n < 0 ? -1 : n; 635 goto reswitch; 636 case '0': 637 /* 638 * ``Note that 0 is taken as a flag, not as the 639 * beginning of a field width.'' 640 * -- ANSI X3J11 641 */ 642 flags |= ZEROPAD; 643 goto rflag; 644 case '1': case '2': case '3': case '4': 645 case '5': case '6': case '7': case '8': case '9': 646 n = 0; 647 do { 648 n = 10 * n + to_digit(ch); 649 ch = *fmt++; 650 } while (is_digit(ch)); 651 if (ch == '$') { 652 nextarg = n; 653 if (argtable == NULL) { 654 argtable = statargtable; 655 __find_arguments (fmt0, orgap, 656 &argtable); 657 } 658 goto rflag; 659 } 660 width = n; 661 goto reswitch; 662 #ifndef NO_FLOATING_POINT 663 case 'L': 664 flags |= LONGDBL; 665 goto rflag; 666 #endif 667 case 'h': 668 if (flags & SHORTINT) { 669 flags &= ~SHORTINT; 670 flags |= CHARINT; 671 } else 672 flags |= SHORTINT; 673 goto rflag; 674 case 'j': 675 flags |= INTMAXT; 676 goto rflag; 677 case 'l': 678 if (flags & LONGINT) { 679 flags &= ~LONGINT; 680 flags |= LLONGINT; 681 } else 682 flags |= LONGINT; 683 goto rflag; 684 case 'q': 685 flags |= LLONGINT; 686 goto rflag; 687 case 't': 688 flags |= PTRDIFFT; 689 goto rflag; 690 case 'z': 691 flags |= SIZET; 692 goto rflag; 693 case 'c': 694 *(cp = buf) = GETARG(int); 695 size = 1; 696 sign = '\0'; 697 break; 698 case 'D': 699 flags |= LONGINT; 700 /*FALLTHROUGH*/ 701 case 'd': 702 case 'i': 703 if (flags & INTMAX_SIZE) { 704 ujval = SJARG(); 705 if ((intmax_t)ujval < 0) { 706 ujval = -ujval; 707 sign = '-'; 708 } 709 } else { 710 ulval = SARG(); 711 if ((long)ulval < 0) { 712 ulval = -ulval; 713 sign = '-'; 714 } 715 } 716 base = 10; 717 goto number; 718 #ifndef NO_FLOATING_POINT 719 #ifdef HEXFLOAT 720 case 'a': 721 case 'A': 722 #endif 723 case 'e': 724 case 'E': 725 /* 726 * Grouping apply to %i, %d, %u, %f, %F, %g, %G 727 * conversion specifiers only. For other conversions 728 * behavior is undefined. 729 * -- POSIX 730 */ 731 flags &= ~GROUPING; 732 /*FALLTHROUGH*/ 733 case 'f': 734 case 'F': 735 goto fp_begin; 736 case 'g': 737 case 'G': 738 if (prec == 0) 739 prec = 1; 740 fp_begin: if (prec == -1) 741 prec = DEFPREC; 742 if (flags & LONGDBL) 743 /* XXX this loses precision. */ 744 _double = (double)GETARG(long double); 745 else 746 _double = GETARG(double); 747 /* do this before tricky precision changes */ 748 if (isinf(_double)) { 749 if (_double < 0) 750 sign = '-'; 751 if (isupper(ch)) 752 cp = "INF"; 753 else 754 cp = "inf"; 755 size = 3; 756 break; 757 } 758 if (isnan(_double)) { 759 if (isupper(ch)) 760 cp = "NAN"; 761 else 762 cp = "nan"; 763 size = 3; 764 break; 765 } 766 flags |= FPT; 767 if (dtoaresult != NULL) { 768 free(dtoaresult); 769 dtoaresult = NULL; 770 } 771 cp = cvt(_double, prec, flags, &softsign, 772 &expt, ch, &ndig, &dtoaresult); 773 if (ch == 'g' || ch == 'G') { 774 if (expt <= -4 || expt > prec) 775 ch = (ch == 'g') ? 'e' : 'E'; 776 else 777 ch = 'g'; 778 } 779 if (ch == 'e' || ch == 'E') { 780 --expt; 781 expsize = exponent(expstr, expt, ch); 782 size = expsize + ndig; 783 if (ndig > 1 || flags & ALT) 784 ++size; 785 } else if (ch == 'f' || ch == 'F') { 786 if (expt > 0) { 787 size = expt; 788 if (prec || flags & ALT) 789 size += prec + 1; 790 } else /* "0.X" */ 791 size = prec + 2; 792 } else if (expt >= ndig) { /* fixed g fmt */ 793 size = expt; 794 if (flags & ALT) 795 ++size; 796 } else 797 size = ndig + (expt > 0 ? 798 1 : 2 - expt); 799 800 if (softsign) 801 sign = '-'; 802 break; 803 #endif /* NO_FLOATING_POINT */ 804 case 'n': 805 /* 806 * Assignment-like behavior is specified if the 807 * value overflows or is otherwise unrepresentable. 808 * C99 says to use `signed char' for %hhn conversions. 809 */ 810 if (flags & LLONGINT) 811 *GETARG(long long *) = ret; 812 else if (flags & SIZET) 813 *GETARG(ssize_t *) = (ssize_t)ret; 814 else if (flags & PTRDIFFT) 815 *GETARG(ptrdiff_t *) = ret; 816 else if (flags & INTMAXT) 817 *GETARG(intmax_t *) = ret; 818 else if (flags & LONGINT) 819 *GETARG(long *) = ret; 820 else if (flags & SHORTINT) 821 *GETARG(short *) = ret; 822 else if (flags & CHARINT) 823 *GETARG(signed char *) = ret; 824 else 825 *GETARG(int *) = ret; 826 continue; /* no output */ 827 case 'O': 828 flags |= LONGINT; 829 /*FALLTHROUGH*/ 830 case 'o': 831 if (flags & INTMAX_SIZE) 832 ujval = UJARG(); 833 else 834 ulval = UARG(); 835 base = 8; 836 goto nosign; 837 case 'p': 838 /* 839 * ``The argument shall be a pointer to void. The 840 * value of the pointer is converted to a sequence 841 * of printable characters, in an implementation- 842 * defined manner.'' 843 * -- ANSI X3J11 844 */ 845 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 846 base = 16; 847 xdigs = "0123456789abcdef"; 848 flags = flags | INTMAXT | HEXPREFIX; 849 ch = 'x'; 850 goto nosign; 851 case 's': 852 if ((cp = GETARG(char *)) == NULL) 853 cp = "(null)"; 854 if (prec >= 0) { 855 /* 856 * can't use strlen; can only look for the 857 * NUL in the first `prec' characters, and 858 * strlen() will go further. 859 */ 860 char *p = memchr(cp, 0, (size_t)prec); 861 862 if (p != NULL) { 863 size = p - cp; 864 if (size > prec) 865 size = prec; 866 } else 867 size = prec; 868 } else 869 size = strlen(cp); 870 sign = '\0'; 871 break; 872 case 'U': 873 flags |= LONGINT; 874 /*FALLTHROUGH*/ 875 case 'u': 876 if (flags & INTMAX_SIZE) 877 ujval = UJARG(); 878 else 879 ulval = UARG(); 880 base = 10; 881 goto nosign; 882 case 'X': 883 xdigs = "0123456789ABCDEF"; 884 goto hex; 885 case 'x': 886 xdigs = "0123456789abcdef"; 887 hex: 888 if (flags & INTMAX_SIZE) 889 ujval = UJARG(); 890 else 891 ulval = UARG(); 892 base = 16; 893 /* leading 0x/X only if non-zero */ 894 if (flags & ALT && 895 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 896 flags |= HEXPREFIX; 897 898 flags &= ~GROUPING; 899 /* unsigned conversions */ 900 nosign: sign = '\0'; 901 /* 902 * ``... diouXx conversions ... if a precision is 903 * specified, the 0 flag will be ignored.'' 904 * -- ANSI X3J11 905 */ 906 number: if ((dprec = prec) >= 0) 907 flags &= ~ZEROPAD; 908 909 /* 910 * ``The result of converting a zero value with an 911 * explicit precision of zero is no characters.'' 912 * -- ANSI X3J11 913 */ 914 cp = buf + BUF; 915 if (flags & INTMAX_SIZE) { 916 if (ujval != 0 || prec != 0) 917 cp = __ujtoa(ujval, cp, base, 918 flags & ALT, xdigs, 919 flags & GROUPING, thousands_sep, 920 grouping); 921 } else { 922 if (ulval != 0 || prec != 0) 923 cp = __ultoa(ulval, cp, base, 924 flags & ALT, xdigs, 925 flags & GROUPING, thousands_sep, 926 grouping); 927 } 928 size = buf + BUF - cp; 929 break; 930 default: /* "%?" prints ?, unless ? is NUL */ 931 if (ch == '\0') 932 goto done; 933 /* pretend it was %c with argument ch */ 934 cp = buf; 935 *cp = ch; 936 size = 1; 937 sign = '\0'; 938 break; 939 } 940 941 /* 942 * All reasonable formats wind up here. At this point, `cp' 943 * points to a string which (if not flags&LADJUST) should be 944 * padded out to `width' places. If flags&ZEROPAD, it should 945 * first be prefixed by any sign or other prefix; otherwise, 946 * it should be blank padded before the prefix is emitted. 947 * After any left-hand padding and prefixing, emit zeroes 948 * required by a decimal [diouxX] precision, then print the 949 * string proper, then emit zeroes required by any leftover 950 * floating precision; finally, if LADJUST, pad with blanks. 951 * 952 * Compute actual size, so we know how much to pad. 953 * size excludes decimal prec; realsz includes it. 954 */ 955 realsz = dprec > size ? dprec : size; 956 if (sign) 957 realsz++; 958 else if (flags & HEXPREFIX) 959 realsz += 2; 960 961 prsize = width > realsz ? width : realsz; 962 if ((unsigned)ret + prsize > INT_MAX) { 963 ret = EOF; 964 goto error; 965 } 966 967 /* right-adjusting blank padding */ 968 if ((flags & (LADJUST|ZEROPAD)) == 0) 969 PAD(width - realsz, blanks); 970 971 /* prefix */ 972 if (sign) { 973 PRINT(&sign, 1); 974 } else if (flags & HEXPREFIX) { 975 ox[0] = '0'; 976 ox[1] = ch; 977 PRINT(ox, 2); 978 } 979 980 /* right-adjusting zero padding */ 981 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 982 PAD(width - realsz, zeroes); 983 984 /* leading zeroes from decimal precision */ 985 PAD(dprec - size, zeroes); 986 987 /* the string or number proper */ 988 #ifndef NO_FLOATING_POINT 989 if ((flags & FPT) == 0) { 990 PRINT(cp, size); 991 } else { /* glue together f_p fragments */ 992 if (ch >= 'f') { /* 'f' or 'g' */ 993 if (_double == 0) { 994 /* kludge for __dtoa irregularity */ 995 PRINT("0", 1); 996 if (expt < ndig || (flags & ALT) != 0) { 997 PRINT(decimal_point, 1); 998 PAD(ndig - 1, zeroes); 999 } 1000 } else if (expt <= 0) { 1001 PRINT("0", 1); 1002 PRINT(decimal_point, 1); 1003 PAD(-expt, zeroes); 1004 PRINT(cp, ndig); 1005 } else if (expt >= ndig) { 1006 PRINT(cp, ndig); 1007 PAD(expt - ndig, zeroes); 1008 if (flags & ALT) 1009 PRINT(decimal_point, 1); 1010 } else { 1011 PRINT(cp, expt); 1012 cp += expt; 1013 PRINT(decimal_point, 1); 1014 PRINT(cp, ndig-expt); 1015 } 1016 } else { /* 'e' or 'E' */ 1017 if (ndig > 1 || flags & ALT) { 1018 ox[0] = *cp++; 1019 ox[1] = *decimal_point; 1020 PRINT(ox, 2); 1021 if (_double) { 1022 PRINT(cp, ndig-1); 1023 } else /* 0.[0..] */ 1024 /* __dtoa irregularity */ 1025 PAD(ndig - 1, zeroes); 1026 } else /* XeYYY */ 1027 PRINT(cp, 1); 1028 PRINT(expstr, expsize); 1029 } 1030 } 1031 #else 1032 PRINT(cp, size); 1033 #endif 1034 /* left-adjusting padding (always blank) */ 1035 if (flags & LADJUST) 1036 PAD(width - realsz, blanks); 1037 1038 /* finally, adjust ret */ 1039 ret += prsize; 1040 1041 FLUSH(); /* copy out the I/O vectors */ 1042 } 1043 done: 1044 FLUSH(); 1045 error: 1046 #ifndef NO_FLOATING_POINT 1047 if (dtoaresult != NULL) 1048 free(dtoaresult); 1049 #endif 1050 if (__sferror(fp)) 1051 ret = EOF; 1052 if ((argtable != NULL) && (argtable != statargtable)) 1053 free (argtable); 1054 return (ret); 1055 /* NOTREACHED */ 1056 } 1057 1058 /* 1059 * Find all arguments when a positional parameter is encountered. Returns a 1060 * table, indexed by argument number, of pointers to each arguments. The 1061 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 1062 * It will be replaces with a malloc-ed one if it overflows. 1063 */ 1064 static void 1065 __find_arguments (const char *fmt0, va_list ap, union arg **argtable) 1066 { 1067 char *fmt; /* format string */ 1068 int ch; /* character from fmt */ 1069 int n, n2; /* handy integer (short term usage) */ 1070 char *cp; /* handy char pointer (short term usage) */ 1071 int flags; /* flags as above */ 1072 int width; /* width from format (%8d), or 0 */ 1073 enum typeid *typetable; /* table of types */ 1074 enum typeid stattypetable[STATIC_ARG_TBL_SIZE]; 1075 int tablesize; /* current size of type table */ 1076 int tablemax; /* largest used index in table */ 1077 int nextarg; /* 1-based argument index */ 1078 1079 /* 1080 * Add an argument type to the table, expanding if necessary. 1081 */ 1082 #define ADDTYPE(type) \ 1083 ((nextarg >= tablesize) ? \ 1084 __grow_type_table(nextarg, &typetable, &tablesize) : 0, \ 1085 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 1086 typetable[nextarg++] = type) 1087 1088 #define ADDSARG() \ 1089 ((flags&INTMAXT) ? ADDTYPE(T_INTMAXT) : \ 1090 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1091 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1092 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 1093 ((flags&LONGINT) ? ADDTYPE(T_LONG) : ADDTYPE(T_INT)))))) 1094 1095 #define ADDUARG() \ 1096 ((flags&INTMAXT) ? ADDTYPE(T_UINTMAXT) : \ 1097 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1098 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1099 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 1100 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : ADDTYPE(T_U_INT)))))) 1101 1102 /* 1103 * Add * arguments to the type array. 1104 */ 1105 #define ADDASTER() \ 1106 n2 = 0; \ 1107 cp = fmt; \ 1108 while (is_digit(*cp)) { \ 1109 n2 = 10 * n2 + to_digit(*cp); \ 1110 cp++; \ 1111 } \ 1112 if (*cp == '$') { \ 1113 int hold = nextarg; \ 1114 nextarg = n2; \ 1115 ADDTYPE (T_INT); \ 1116 nextarg = hold; \ 1117 fmt = ++cp; \ 1118 } else { \ 1119 ADDTYPE (T_INT); \ 1120 } 1121 fmt = (char *)fmt0; 1122 typetable = stattypetable; 1123 tablesize = STATIC_ARG_TBL_SIZE; 1124 tablemax = 0; 1125 nextarg = 1; 1126 memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 1127 1128 /* 1129 * Scan the format for conversions (`%' character). 1130 */ 1131 for (;;) { 1132 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 1133 /* void */; 1134 if (ch == '\0') 1135 goto done; 1136 fmt++; /* skip over '%' */ 1137 1138 flags = 0; 1139 width = 0; 1140 1141 rflag: ch = *fmt++; 1142 reswitch: switch (ch) { 1143 case ' ': 1144 case '#': 1145 goto rflag; 1146 case '*': 1147 ADDASTER (); 1148 goto rflag; 1149 case '-': 1150 case '+': 1151 case '\'': 1152 goto rflag; 1153 case '.': 1154 if ((ch = *fmt++) == '*') { 1155 ADDASTER (); 1156 goto rflag; 1157 } 1158 while (is_digit(ch)) { 1159 ch = *fmt++; 1160 } 1161 goto reswitch; 1162 case '0': 1163 goto rflag; 1164 case '1': case '2': case '3': case '4': 1165 case '5': case '6': case '7': case '8': case '9': 1166 n = 0; 1167 do { 1168 n = 10 * n + to_digit(ch); 1169 ch = *fmt++; 1170 } while (is_digit(ch)); 1171 if (ch == '$') { 1172 nextarg = n; 1173 goto rflag; 1174 } 1175 width = n; 1176 goto reswitch; 1177 #ifndef NO_FLOATING_POINT 1178 case 'L': 1179 flags |= LONGDBL; 1180 goto rflag; 1181 #endif 1182 case 'h': 1183 if (flags & SHORTINT) { 1184 flags &= ~SHORTINT; 1185 flags |= CHARINT; 1186 } else 1187 flags |= SHORTINT; 1188 goto rflag; 1189 case 'j': 1190 flags |= INTMAXT; 1191 goto rflag; 1192 case 'l': 1193 if (flags & LONGINT) { 1194 flags &= ~LONGINT; 1195 flags |= LLONGINT; 1196 } else 1197 flags |= LONGINT; 1198 goto rflag; 1199 case 'q': 1200 flags |= LLONGINT; 1201 goto rflag; 1202 case 't': 1203 flags |= PTRDIFFT; 1204 goto rflag; 1205 case 'z': 1206 flags |= SIZET; 1207 goto rflag; 1208 case 'c': 1209 ADDTYPE(T_INT); 1210 break; 1211 case 'D': 1212 flags |= LONGINT; 1213 /*FALLTHROUGH*/ 1214 case 'd': 1215 case 'i': 1216 ADDSARG(); 1217 break; 1218 #ifndef NO_FLOATING_POINT 1219 #ifdef HEXFLOAT 1220 case 'a': 1221 case 'A': 1222 #endif 1223 case 'e': 1224 case 'E': 1225 case 'f': 1226 case 'g': 1227 case 'G': 1228 if (flags & LONGDBL) 1229 ADDTYPE(T_LONG_DOUBLE); 1230 else 1231 ADDTYPE(T_DOUBLE); 1232 break; 1233 #endif /* NO_FLOATING_POINT */ 1234 case 'n': 1235 if (flags & INTMAXT) 1236 ADDTYPE(TP_INTMAXT); 1237 else if (flags & PTRDIFFT) 1238 ADDTYPE(TP_PTRDIFFT); 1239 else if (flags & SIZET) 1240 ADDTYPE(TP_SIZET); 1241 else if (flags & LLONGINT) 1242 ADDTYPE(TP_LLONG); 1243 else if (flags & LONGINT) 1244 ADDTYPE(TP_LONG); 1245 else if (flags & SHORTINT) 1246 ADDTYPE(TP_SHORT); 1247 else if (flags & CHARINT) 1248 ADDTYPE(TP_SCHAR); 1249 else 1250 ADDTYPE(TP_INT); 1251 continue; /* no output */ 1252 case 'O': 1253 flags |= LONGINT; 1254 /*FALLTHROUGH*/ 1255 case 'o': 1256 ADDUARG(); 1257 break; 1258 case 'p': 1259 ADDTYPE(TP_VOID); 1260 break; 1261 case 's': 1262 ADDTYPE(TP_CHAR); 1263 break; 1264 case 'U': 1265 flags |= LONGINT; 1266 /*FALLTHROUGH*/ 1267 case 'u': 1268 case 'X': 1269 case 'x': 1270 ADDUARG(); 1271 break; 1272 default: /* "%?" prints ?, unless ? is NUL */ 1273 if (ch == '\0') 1274 goto done; 1275 break; 1276 } 1277 } 1278 done: 1279 /* 1280 * Build the argument table. 1281 */ 1282 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1283 *argtable = (union arg *) 1284 malloc(sizeof(union arg) * (tablemax + 1)); 1285 } 1286 (*argtable)[0].intarg = 0; 1287 for (n = 1; n <= tablemax; n++) { 1288 switch (typetable [n]) { 1289 case T_UNUSED: /* "whoops" */ 1290 case T_INT: 1291 (*argtable)[n].intarg = va_arg(ap, int); 1292 break; 1293 case TP_SCHAR: 1294 (*argtable) [n].pschararg = va_arg (ap, signed char *); 1295 case TP_SHORT: 1296 (*argtable)[n].pshortarg = va_arg(ap, short *); 1297 break; 1298 case T_U_INT: 1299 (*argtable)[n].uintarg = va_arg(ap, unsigned int); 1300 break; 1301 case TP_INT: 1302 (*argtable)[n].pintarg = va_arg(ap, int *); 1303 break; 1304 case T_LONG: 1305 (*argtable)[n].longarg = va_arg(ap, long); 1306 break; 1307 case T_U_LONG: 1308 (*argtable)[n].ulongarg = va_arg(ap, unsigned long); 1309 break; 1310 case TP_LONG: 1311 (*argtable)[n].plongarg = va_arg(ap, long *); 1312 break; 1313 case T_LLONG: 1314 (*argtable)[n].longlongarg = va_arg(ap, long long); 1315 break; 1316 case T_U_LLONG: 1317 (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long); 1318 break; 1319 case TP_LLONG: 1320 (*argtable)[n].plonglongarg = va_arg(ap, long long *); 1321 break; 1322 case T_PTRDIFFT: 1323 (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t); 1324 break; 1325 case TP_PTRDIFFT: 1326 (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *); 1327 break; 1328 case T_SIZET: 1329 (*argtable)[n].sizearg = va_arg(ap, size_t); 1330 break; 1331 case TP_SIZET: 1332 (*argtable)[n].psizearg = va_arg(ap, ssize_t *); 1333 break; 1334 case T_INTMAXT: 1335 (*argtable)[n].intmaxarg = va_arg(ap, intmax_t); 1336 break; 1337 case T_UINTMAXT: 1338 (*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t); 1339 break; 1340 case TP_INTMAXT: 1341 (*argtable)[n].pintmaxarg = va_arg (ap, intmax_t *); 1342 break; 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 case TP_CHAR: 1350 (*argtable)[n].pchararg = va_arg(ap, char *); 1351 break; 1352 case TP_VOID: 1353 (*argtable)[n].pvoidarg = va_arg(ap, void *); 1354 break; 1355 } 1356 } 1357 1358 if ((typetable != NULL) && (typetable != stattypetable)) 1359 free (typetable); 1360 } 1361 1362 /* 1363 * Increase the size of the type table. 1364 */ 1365 static void 1366 __grow_type_table(int nextarg, enum typeid **typetable, int *tablesize) 1367 { 1368 enum typeid * const oldtable = *typetable; 1369 const int oldsize = *tablesize; 1370 enum typeid *newtable; 1371 int newsize = oldsize * 2; 1372 1373 if (newsize < nextarg + 1) 1374 newsize = nextarg + 1; 1375 if (oldsize == STATIC_ARG_TBL_SIZE) { 1376 if ((newtable = malloc(newsize)) == NULL) 1377 abort(); /* XXX handle better */ 1378 bcopy(oldtable, newtable, oldsize); 1379 } else { 1380 if ((newtable = reallocf(oldtable, newsize)) == NULL) 1381 abort(); /* XXX handle better */ 1382 } 1383 memset(&newtable[oldsize], T_UNUSED, newsize - oldsize); 1384 1385 *typetable = newtable; 1386 *tablesize = newsize; 1387 } 1388 1389 1390 #ifndef NO_FLOATING_POINT 1391 1392 extern char *__dtoa (double, int, int, int *, int *, char **, char **); 1393 1394 static char * 1395 cvt(double value, int ndigits, int flags, char *sign, int *decpt, 1396 int ch, int *length, char **dtoaresultp) 1397 { 1398 int mode, dsgn; 1399 char *digits, *bp, *rve; 1400 1401 if (ch == 'f') 1402 mode = 3; /* ndigits after the decimal point */ 1403 else { 1404 /* 1405 * To obtain ndigits after the decimal point for the 'e' 1406 * and 'E' formats, round to ndigits + 1 significant 1407 * figures. 1408 */ 1409 if (ch == 'e' || ch == 'E') 1410 ndigits++; 1411 mode = 2; /* ndigits significant digits */ 1412 } 1413 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve, dtoaresultp); 1414 *sign = dsgn != 0; 1415 if ((ch != 'g' && ch != 'G') || flags & ALT) { 1416 /* print trailing zeros */ 1417 bp = digits + ndigits; 1418 if (ch == 'f') { 1419 if (*digits == '0' && value) 1420 *decpt = -ndigits + 1; 1421 bp += *decpt; 1422 } 1423 if (value == 0) /* kludge for __dtoa irregularity */ 1424 rve = bp; 1425 while (rve < bp) 1426 *rve++ = '0'; 1427 } 1428 *length = rve - digits; 1429 return (digits); 1430 } 1431 1432 static int 1433 exponent(char *p0, int expo, int fmtch) 1434 { 1435 char *p, *t; 1436 char expbuf[MAXEXPDIG]; 1437 1438 p = p0; 1439 *p++ = fmtch; 1440 if (expo < 0) { 1441 expo = -expo; 1442 *p++ = '-'; 1443 } 1444 else 1445 *p++ = '+'; 1446 t = expbuf + MAXEXPDIG; 1447 if (expo > 9) { 1448 do { 1449 *--t = to_char(expo % 10); 1450 } while ((expo /= 10) > 9); 1451 *--t = to_char(expo); 1452 for (; t < expbuf + MAXEXPDIG; *p++ = *t++); 1453 } 1454 else { 1455 *p++ = '0'; 1456 *p++ = to_char(expo); 1457 } 1458 return (p - p0); 1459 } 1460 #endif /* NO_FLOATING_POINT */ 1461