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 #if 0 39 static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * Actual printf innards. 47 * 48 * This code is large and complicated... 49 */ 50 51 #include "namespace.h" 52 #include <sys/types.h> 53 54 #include <ctype.h> 55 #include <limits.h> 56 #include <locale.h> 57 #include <stddef.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #if __STDC__ 64 #include <stdarg.h> 65 #else 66 #include <varargs.h> 67 #endif 68 #include "un-namespace.h" 69 70 #include "libc_private.h" 71 #include "local.h" 72 #include "fvwrite.h" 73 74 /* Define FLOATING_POINT to get floating point. */ 75 #define FLOATING_POINT 76 77 union arg { 78 int intarg; 79 u_int uintarg; 80 long longarg; 81 u_long ulongarg; 82 long long longlongarg; 83 unsigned long long ulonglongarg; 84 ptrdiff_t ptrdiffarg; 85 size_t sizearg; 86 intmax_t intmaxarg; 87 uintmax_t uintmaxarg; 88 void *pvoidarg; 89 char *pchararg; 90 signed char *pschararg; 91 short *pshortarg; 92 int *pintarg; 93 long *plongarg; 94 long long *plonglongarg; 95 ptrdiff_t *pptrdiffarg; 96 size_t *psizearg; 97 intmax_t *pintmaxarg; 98 #ifdef FLOATING_POINT 99 double doublearg; 100 long double longdoublearg; 101 #endif 102 }; 103 104 /* 105 * Type ids for argument type table. 106 */ 107 enum typeid { 108 T_UNUSED, TP_SHORT, T_INT, T_U_INT, TP_INT, 109 T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG, 110 T_PTRDIFFT, TP_PTRDIFFT, T_SIZET, TP_SIZET, 111 T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR, 112 T_DOUBLE, T_LONG_DOUBLE 113 }; 114 115 static int __sprint __P((FILE *, struct __suio *)); 116 static int __sbprintf __P((FILE *, const char *, va_list)) __printflike(2, 0); 117 static char *__ujtoa __P((uintmax_t, char *, int, int, char *, int, 118 char, const char *)); 119 static char *__ultoa __P((u_long, char *, int, int, char *, int, 120 char, const char *)); 121 static void __find_arguments __P((const char *, va_list, union arg **)); 122 static void __grow_type_table __P((int, enum typeid **, int *)); 123 124 /* 125 * Flush out all the vectors defined by the given uio, 126 * then reset it so that it can be reused. 127 */ 128 static int 129 __sprint(FILE *fp, struct __suio *uio) 130 { 131 int err; 132 133 if (uio->uio_resid == 0) { 134 uio->uio_iovcnt = 0; 135 return (0); 136 } 137 err = __sfvwrite(fp, uio); 138 uio->uio_resid = 0; 139 uio->uio_iovcnt = 0; 140 return (err); 141 } 142 143 /* 144 * Helper function for `fprintf to unbuffered unix file': creates a 145 * temporary buffer. We only work on write-only files; this avoids 146 * worries about ungetc buffers and so forth. 147 */ 148 static int 149 __sbprintf(FILE *fp, const char *fmt, va_list ap) 150 { 151 int ret; 152 FILE fake; 153 unsigned char buf[BUFSIZ]; 154 155 /* copy the important variables */ 156 fake._flags = fp->_flags & ~__SNBF; 157 fake._file = fp->_file; 158 fake._cookie = fp->_cookie; 159 fake._write = fp->_write; 160 161 /* set up the buffer */ 162 fake._bf._base = fake._p = buf; 163 fake._bf._size = fake._w = sizeof(buf); 164 fake._lbfsize = 0; /* not actually used, but Just In Case */ 165 166 /* do the work, then copy any error status */ 167 ret = __vfprintf(&fake, fmt, ap); 168 if (ret >= 0 && __fflush(&fake)) 169 ret = EOF; 170 if (fake._flags & __SERR) 171 fp->_flags |= __SERR; 172 return (ret); 173 } 174 175 /* 176 * Macros for converting digits to letters and vice versa 177 */ 178 #define to_digit(c) ((c) - '0') 179 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 180 #define to_char(n) ((n) + '0') 181 182 /* 183 * Convert an unsigned long to ASCII for printf purposes, returning 184 * a pointer to the first character of the string representation. 185 * Octal numbers can be forced to have a leading zero; hex numbers 186 * use the given digits. 187 */ 188 static char * 189 __ultoa(u_long val, char *endp, int base, int octzero, char *xdigs, 190 int needgrp, char thousep, const char *grp) 191 { 192 register char *cp = endp; 193 register long sval; 194 int ndig; 195 196 /* 197 * Handle the three cases separately, in the hope of getting 198 * better/faster code. 199 */ 200 switch (base) { 201 case 10: 202 if (val < 10) { /* many numbers are 1 digit */ 203 *--cp = to_char(val); 204 return (cp); 205 } 206 ndig = 0; 207 /* 208 * On many machines, unsigned arithmetic is harder than 209 * signed arithmetic, so we do at most one unsigned mod and 210 * divide; this is sufficient to reduce the range of 211 * the incoming value to where signed arithmetic works. 212 */ 213 if (val > LONG_MAX) { 214 *--cp = to_char(val % 10); 215 ndig++; 216 sval = val / 10; 217 } else 218 sval = val; 219 do { 220 *--cp = to_char(sval % 10); 221 ndig++; 222 /* 223 * If (*grp == CHAR_MAX) then no more grouping 224 * should be performed. 225 */ 226 if (needgrp && ndig == *grp && *grp != CHAR_MAX 227 && sval > 9) { 228 *--cp = thousep; 229 ndig = 0; 230 /* 231 * If (*(grp+1) == '\0') then we have to 232 * use *grp character (last grouping rule) 233 * for all next cases 234 */ 235 if (*(grp+1) != '\0') 236 grp++; 237 } 238 sval /= 10; 239 } while (sval != 0); 240 break; 241 242 case 8: 243 do { 244 *--cp = to_char(val & 7); 245 val >>= 3; 246 } while (val); 247 if (octzero && *cp != '0') 248 *--cp = '0'; 249 break; 250 251 case 16: 252 do { 253 *--cp = xdigs[val & 15]; 254 val >>= 4; 255 } while (val); 256 break; 257 258 default: /* oops */ 259 abort(); 260 } 261 return (cp); 262 } 263 264 /* Identical to __ultoa, but for intmax_t. */ 265 static char * 266 __ujtoa(uintmax_t val, char *endp, int base, int octzero, char *xdigs, 267 int needgrp, char thousep, const char *grp) 268 { 269 char *cp = endp; 270 intmax_t sval; 271 int ndig; 272 273 /* quick test for small values; __ultoa is typically much faster */ 274 /* (perhaps instead we should run until small, then call __ultoa?) */ 275 if (val <= ULONG_MAX) 276 return (__ultoa((u_long)val, endp, base, octzero, xdigs, 277 needgrp, thousep, grp)); 278 switch (base) { 279 case 10: 280 if (val < 10) { 281 *--cp = to_char(val % 10); 282 return (cp); 283 } 284 ndig = 0; 285 if (val > INTMAX_MAX) { 286 *--cp = to_char(val % 10); 287 ndig++; 288 sval = val / 10; 289 } else 290 sval = val; 291 do { 292 *--cp = to_char(sval % 10); 293 ndig++; 294 /* 295 * If (*grp == CHAR_MAX) then no more grouping 296 * should be performed. 297 */ 298 if (needgrp && *grp != CHAR_MAX && ndig == *grp 299 && sval > 9) { 300 *--cp = thousep; 301 ndig = 0; 302 /* 303 * If (*(grp+1) == '\0') then we have to 304 * use *grp character (last grouping rule) 305 * for all next cases 306 */ 307 if (*(grp+1) != '\0') 308 grp++; 309 } 310 sval /= 10; 311 } while (sval != 0); 312 break; 313 314 case 8: 315 do { 316 *--cp = to_char(val & 7); 317 val >>= 3; 318 } while (val); 319 if (octzero && *cp != '0') 320 *--cp = '0'; 321 break; 322 323 case 16: 324 do { 325 *--cp = xdigs[val & 15]; 326 val >>= 4; 327 } while (val); 328 break; 329 330 default: 331 abort(); 332 } 333 return (cp); 334 } 335 336 /* 337 * MT-safe version 338 */ 339 int 340 vfprintf(FILE *fp, const char *fmt0, va_list ap) 341 { 342 int ret; 343 344 FLOCKFILE(fp); 345 ret = __vfprintf(fp, fmt0, ap); 346 FUNLOCKFILE(fp); 347 return (ret); 348 } 349 350 #ifdef FLOATING_POINT 351 #include <math.h> 352 #include "floatio.h" 353 354 #define BUF ((MAXEXP*2)+MAXFRACT+1) /* + decimal point */ 355 #define DEFPREC 6 356 357 static char *cvt __P((double, int, int, char *, int *, int, int *, char **)); 358 static int exponent __P((char *, int, int)); 359 360 #else /* no FLOATING_POINT */ 361 362 #define BUF 136 363 364 #endif /* FLOATING_POINT */ 365 366 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 367 368 /* 369 * Flags used during conversion. 370 */ 371 #define ALT 0x001 /* alternate form */ 372 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 373 #define LADJUST 0x004 /* left adjustment */ 374 #define LONGDBL 0x008 /* long double */ 375 #define LONGINT 0x010 /* long integer */ 376 #define LLONGINT 0x020 /* long long integer */ 377 #define SHORTINT 0x040 /* short integer */ 378 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 379 #define FPT 0x100 /* Floating point number */ 380 #define GROUPING 0x200 /* use grouping ("'" flag) */ 381 /* C99 additional size modifiers: */ 382 #define SIZET 0x400 /* size_t */ 383 #define PTRDIFFT 0x800 /* ptrdiff_t */ 384 #define INTMAXT 0x1000 /* intmax_t */ 385 #define CHARINT 0x2000 /* print char using int format */ 386 387 /* 388 * Non-MT-safe version 389 */ 390 int 391 __vfprintf(FILE *fp, const char *fmt0, va_list ap) 392 { 393 char *fmt; /* format string */ 394 int ch; /* character from fmt */ 395 int n, n2; /* handy integer (short term usage) */ 396 char *cp; /* handy char pointer (short term usage) */ 397 struct __siov *iovp; /* for PRINT macro */ 398 int flags; /* flags as above */ 399 int ret; /* return value accumulator */ 400 int width; /* width from format (%8d), or 0 */ 401 int prec; /* precision from format (%.3d), or -1 */ 402 char sign; /* sign prefix (' ', '+', '-', or \0) */ 403 char thousands_sep; /* locale specific thousands separator */ 404 const char *grouping; /* locale specific numeric grouping rules */ 405 #ifdef FLOATING_POINT 406 char *decimal_point; /* locale specific decimal point */ 407 char softsign; /* temporary negative sign for floats */ 408 double _double; /* double precision arguments %[eEfgG] */ 409 int expt; /* integer value of exponent */ 410 int expsize; /* character count for expstr */ 411 int ndig; /* actual number of digits returned by cvt */ 412 char expstr[7]; /* buffer for exponent string */ 413 char *dtoaresult; /* buffer allocated by dtoa */ 414 #endif 415 u_long ulval; /* integer arguments %[diouxX] */ 416 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 417 int base; /* base for [diouxX] conversion */ 418 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 419 int realsz; /* field size expanded by dprec, sign, etc */ 420 int size; /* size of converted field or string */ 421 int prsize; /* max size of printed field */ 422 char *xdigs; /* digits for [xX] conversion */ 423 #define NIOV 8 424 struct __suio uio; /* output information: summary */ 425 struct __siov iov[NIOV];/* ... and individual io vectors */ 426 char buf[BUF]; /* space for %c, %[diouxX], %[eEfFgG] */ 427 char ox[2]; /* space for 0x hex-prefix */ 428 union arg *argtable; /* args, built due to positional arg */ 429 union arg statargtable [STATIC_ARG_TBL_SIZE]; 430 int nextarg; /* 1-based argument index */ 431 va_list orgap; /* original argument pointer */ 432 433 /* 434 * Choose PADSIZE to trade efficiency vs. size. If larger printf 435 * fields occur frequently, increase PADSIZE and make the initialisers 436 * below longer. 437 */ 438 #define PADSIZE 16 /* pad chunk size */ 439 static char blanks[PADSIZE] = 440 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 441 static char zeroes[PADSIZE] = 442 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 443 444 /* 445 * BEWARE, these `goto error' on error, and PAD uses `n'. 446 */ 447 #define PRINT(ptr, len) { \ 448 iovp->iov_base = (ptr); \ 449 iovp->iov_len = (len); \ 450 uio.uio_resid += (len); \ 451 iovp++; \ 452 if (++uio.uio_iovcnt >= NIOV) { \ 453 if (__sprint(fp, &uio)) \ 454 goto error; \ 455 iovp = iov; \ 456 } \ 457 } 458 #define PAD(howmany, with) { \ 459 if ((n = (howmany)) > 0) { \ 460 while (n > PADSIZE) { \ 461 PRINT(with, PADSIZE); \ 462 n -= PADSIZE; \ 463 } \ 464 PRINT(with, n); \ 465 } \ 466 } 467 #define FLUSH() { \ 468 if (uio.uio_resid && __sprint(fp, &uio)) \ 469 goto error; \ 470 uio.uio_iovcnt = 0; \ 471 iovp = iov; \ 472 } 473 474 /* 475 * Get the argument indexed by nextarg. If the argument table is 476 * built, use it to get the argument. If its not, get the next 477 * argument (and arguments must be gotten sequentially). 478 */ 479 #define GETARG(type) \ 480 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 481 (nextarg++, va_arg(ap, type))) 482 483 /* 484 * To extend shorts properly, we need both signed and unsigned 485 * argument extraction methods. 486 */ 487 #define SARG() \ 488 (flags&LONGINT ? GETARG(long) : \ 489 flags&SHORTINT ? (long)(short)GETARG(int) : \ 490 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 491 (long)GETARG(int)) 492 #define UARG() \ 493 (flags&LONGINT ? GETARG(u_long) : \ 494 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 495 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 496 (u_long)GETARG(u_int)) 497 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 498 #define SJARG() \ 499 (flags&INTMAXT ? GETARG(intmax_t) : \ 500 flags&SIZET ? (intmax_t)GETARG(size_t) : \ 501 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 502 (intmax_t)GETARG(long long)) 503 #define UJARG() \ 504 (flags&INTMAXT ? GETARG(uintmax_t) : \ 505 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 506 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 507 (uintmax_t)GETARG(unsigned long long)) 508 509 /* 510 * Get * arguments, including the form *nn$. Preserve the nextarg 511 * that the argument can be gotten once the type is determined. 512 */ 513 #define GETASTER(val) \ 514 n2 = 0; \ 515 cp = fmt; \ 516 while (is_digit(*cp)) { \ 517 n2 = 10 * n2 + to_digit(*cp); \ 518 cp++; \ 519 } \ 520 if (*cp == '$') { \ 521 int hold = nextarg; \ 522 if (argtable == NULL) { \ 523 argtable = statargtable; \ 524 __find_arguments (fmt0, orgap, &argtable); \ 525 } \ 526 nextarg = n2; \ 527 val = GETARG (int); \ 528 nextarg = hold; \ 529 fmt = ++cp; \ 530 } else { \ 531 val = GETARG (int); \ 532 } 533 534 535 thousands_sep = '\0'; 536 grouping = NULL; 537 #ifdef FLOATING_POINT 538 dtoaresult = NULL; 539 decimal_point = localeconv()->decimal_point; 540 #endif 541 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 542 if (cantwrite(fp)) 543 return (EOF); 544 545 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 546 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 547 fp->_file >= 0) 548 return (__sbprintf(fp, fmt0, ap)); 549 550 fmt = (char *)fmt0; 551 argtable = NULL; 552 nextarg = 1; 553 orgap = ap; 554 uio.uio_iov = iovp = iov; 555 uio.uio_resid = 0; 556 uio.uio_iovcnt = 0; 557 ret = 0; 558 559 /* 560 * Scan the format for conversions (`%' character). 561 */ 562 for (;;) { 563 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 564 /* void */; 565 if ((n = fmt - cp) != 0) { 566 if ((unsigned)ret + n > INT_MAX) { 567 ret = EOF; 568 goto error; 569 } 570 PRINT(cp, n); 571 ret += n; 572 } 573 if (ch == '\0') 574 goto done; 575 fmt++; /* skip over '%' */ 576 577 flags = 0; 578 dprec = 0; 579 width = 0; 580 prec = -1; 581 sign = '\0'; 582 583 rflag: ch = *fmt++; 584 reswitch: switch (ch) { 585 case ' ': 586 /*- 587 * ``If the space and + flags both appear, the space 588 * flag will be ignored.'' 589 * -- ANSI X3J11 590 */ 591 if (!sign) 592 sign = ' '; 593 goto rflag; 594 case '#': 595 flags |= ALT; 596 goto rflag; 597 case '*': 598 /*- 599 * ``A negative field width argument is taken as a 600 * - flag followed by a positive field width.'' 601 * -- ANSI X3J11 602 * They don't exclude field widths read from args. 603 */ 604 GETASTER (width); 605 if (width >= 0) 606 goto rflag; 607 width = -width; 608 /* FALLTHROUGH */ 609 case '-': 610 flags |= LADJUST; 611 goto rflag; 612 case '+': 613 sign = '+'; 614 goto rflag; 615 case '\'': 616 flags |= GROUPING; 617 thousands_sep = *(localeconv()->thousands_sep); 618 grouping = localeconv()->grouping; 619 goto rflag; 620 case '.': 621 if ((ch = *fmt++) == '*') { 622 GETASTER (n); 623 prec = n < 0 ? -1 : n; 624 goto rflag; 625 } 626 n = 0; 627 while (is_digit(ch)) { 628 n = 10 * n + to_digit(ch); 629 ch = *fmt++; 630 } 631 prec = n < 0 ? -1 : n; 632 goto reswitch; 633 case '0': 634 /*- 635 * ``Note that 0 is taken as a flag, not as the 636 * beginning of a field width.'' 637 * -- ANSI X3J11 638 */ 639 flags |= ZEROPAD; 640 goto rflag; 641 case '1': case '2': case '3': case '4': 642 case '5': case '6': case '7': case '8': case '9': 643 n = 0; 644 do { 645 n = 10 * n + to_digit(ch); 646 ch = *fmt++; 647 } while (is_digit(ch)); 648 if (ch == '$') { 649 nextarg = n; 650 if (argtable == NULL) { 651 argtable = statargtable; 652 __find_arguments (fmt0, orgap, 653 &argtable); 654 } 655 goto rflag; 656 } 657 width = n; 658 goto reswitch; 659 #ifdef FLOATING_POINT 660 case 'L': 661 flags |= LONGDBL; 662 goto rflag; 663 #endif 664 case 'h': 665 if (flags & SHORTINT) { 666 flags &= ~SHORTINT; 667 flags |= CHARINT; 668 } else 669 flags |= SHORTINT; 670 goto rflag; 671 case 'j': 672 flags |= INTMAXT; 673 goto rflag; 674 case 'l': 675 if (flags & LONGINT) { 676 flags &= ~LONGINT; 677 flags |= LLONGINT; 678 } else 679 flags |= LONGINT; 680 goto rflag; 681 case 'q': 682 flags |= LLONGINT; /* not necessarily */ 683 goto rflag; 684 case 't': 685 flags |= PTRDIFFT; 686 goto rflag; 687 case 'z': 688 flags |= SIZET; 689 goto rflag; 690 case 'c': 691 *(cp = buf) = GETARG(int); 692 size = 1; 693 sign = '\0'; 694 break; 695 case 'D': 696 flags |= LONGINT; 697 /*FALLTHROUGH*/ 698 case 'd': 699 case 'i': 700 if (flags & INTMAX_SIZE) { 701 ujval = SJARG(); 702 if ((intmax_t)ujval < 0) { 703 ujval = -ujval; 704 sign = '-'; 705 } 706 } else { 707 ulval = SARG(); 708 if ((long)ulval < 0) { 709 ulval = -ulval; 710 sign = '-'; 711 } 712 } 713 base = 10; 714 goto number; 715 #ifdef FLOATING_POINT 716 #ifdef HEXFLOAT 717 case 'a': 718 case 'A': 719 #endif 720 case 'e': 721 case 'E': 722 /*- 723 * Grouping apply to %i, %d, %u, %f, %F, %g, %G 724 * conversion specifiers only. For other conversions 725 * behavior is undefined. 726 * -- POSIX 727 */ 728 flags &= ~GROUPING; 729 /*FALLTHROUGH*/ 730 case 'f': 731 case 'F': 732 goto fp_begin; 733 case 'g': 734 case 'G': 735 if (prec == 0) 736 prec = 1; 737 fp_begin: if (prec == -1) 738 prec = DEFPREC; 739 if (flags & LONGDBL) 740 /* XXX this loses precision. */ 741 _double = (double)GETARG(long double); 742 else 743 _double = GETARG(double); 744 /* do this before tricky precision changes */ 745 if (isinf(_double)) { 746 if (_double < 0) 747 sign = '-'; 748 if (isupper(ch)) 749 cp = "INF"; 750 else 751 cp = "inf"; 752 size = 3; 753 break; 754 } 755 if (isnan(_double)) { 756 if (isupper(ch)) 757 cp = "NAN"; 758 else 759 cp = "nan"; 760 size = 3; 761 break; 762 } 763 flags |= FPT; 764 if (dtoaresult != NULL) { 765 free(dtoaresult); 766 dtoaresult = NULL; 767 } 768 cp = cvt(_double, prec, flags, &softsign, 769 &expt, ch, &ndig, &dtoaresult); 770 if (ch == 'g' || ch == 'G') { 771 if (expt <= -4 || expt > prec) 772 ch = (ch == 'g') ? 'e' : 'E'; 773 else 774 ch = 'g'; 775 } 776 if (ch == 'e' || ch == 'E') { 777 --expt; 778 expsize = exponent(expstr, expt, ch); 779 size = expsize + ndig; 780 if (ndig > 1 || flags & ALT) 781 ++size; 782 } else if (ch == 'f' || ch == 'F') { 783 if (expt > 0) { 784 size = expt; 785 if (prec || flags & ALT) 786 size += prec + 1; 787 } else /* "0.X" */ 788 size = prec + 2; 789 } else if (expt >= ndig) { /* fixed g fmt */ 790 size = expt; 791 if (flags & ALT) 792 ++size; 793 } else 794 size = ndig + (expt > 0 ? 795 1 : 2 - expt); 796 797 if (softsign) 798 sign = '-'; 799 break; 800 #endif /* FLOATING_POINT */ 801 case 'n': 802 /* 803 * Assignment-like behavior is specified if the 804 * value overflows or is otherwise unrepresentable. 805 * C99 says to use `signed char' for %hhn conversions. 806 */ 807 if (flags & LLONGINT) 808 *GETARG(long long *) = ret; 809 else if (flags & SIZET) 810 *GETARG(ssize_t *) = (ssize_t)ret; 811 else if (flags & PTRDIFFT) 812 *GETARG(ptrdiff_t *) = ret; 813 else if (flags & INTMAXT) 814 *GETARG(intmax_t *) = ret; 815 else if (flags & LONGINT) 816 *GETARG(long *) = ret; 817 else if (flags & SHORTINT) 818 *GETARG(short *) = ret; 819 else if (flags & CHARINT) 820 *GETARG(signed char *) = ret; 821 else 822 *GETARG(int *) = ret; 823 continue; /* no output */ 824 case 'O': 825 flags |= LONGINT; 826 /*FALLTHROUGH*/ 827 case 'o': 828 if (flags & INTMAX_SIZE) 829 ujval = UJARG(); 830 else 831 ulval = UARG(); 832 base = 8; 833 goto nosign; 834 case 'p': 835 /*- 836 * ``The argument shall be a pointer to void. The 837 * value of the pointer is converted to a sequence 838 * of printable characters, in an implementation- 839 * defined manner.'' 840 * -- ANSI X3J11 841 */ 842 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 843 base = 16; 844 xdigs = "0123456789abcdef"; 845 flags = flags | INTMAXT | HEXPREFIX; 846 ch = 'x'; 847 goto nosign; 848 case 's': 849 if ((cp = GETARG(char *)) == NULL) 850 cp = "(null)"; 851 if (prec >= 0) { 852 /* 853 * can't use strlen; can only look for the 854 * NUL in the first `prec' characters, and 855 * strlen() will go further. 856 */ 857 char *p = memchr(cp, 0, (size_t)prec); 858 859 if (p != NULL) { 860 size = p - cp; 861 if (size > prec) 862 size = prec; 863 } else 864 size = prec; 865 } else 866 size = strlen(cp); 867 sign = '\0'; 868 break; 869 case 'U': 870 flags |= LONGINT; 871 /*FALLTHROUGH*/ 872 case 'u': 873 if (flags & INTMAX_SIZE) 874 ujval = UJARG(); 875 else 876 ulval = UARG(); 877 base = 10; 878 goto nosign; 879 case 'X': 880 xdigs = "0123456789ABCDEF"; 881 goto hex; 882 case 'x': 883 xdigs = "0123456789abcdef"; 884 hex: 885 if (flags & INTMAX_SIZE) 886 ujval = UJARG(); 887 else 888 ulval = UARG(); 889 base = 16; 890 /* leading 0x/X only if non-zero */ 891 if (flags & ALT && 892 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 893 flags |= HEXPREFIX; 894 895 flags &= ~GROUPING; 896 /* unsigned conversions */ 897 nosign: sign = '\0'; 898 /*- 899 * ``... diouXx conversions ... if a precision is 900 * specified, the 0 flag will be ignored.'' 901 * -- ANSI X3J11 902 */ 903 number: if ((dprec = prec) >= 0) 904 flags &= ~ZEROPAD; 905 906 /*- 907 * ``The result of converting a zero value with an 908 * explicit precision of zero is no characters.'' 909 * -- ANSI X3J11 910 */ 911 cp = buf + BUF; 912 if (flags & INTMAX_SIZE) { 913 if (ujval != 0 || prec != 0) 914 cp = __ujtoa(ujval, cp, base, 915 flags & ALT, xdigs, 916 flags & GROUPING, thousands_sep, 917 grouping); 918 } else { 919 if (ulval != 0 || prec != 0) 920 cp = __ultoa(ulval, cp, base, 921 flags & ALT, xdigs, 922 flags & GROUPING, thousands_sep, 923 grouping); 924 } 925 size = buf + BUF - cp; 926 break; 927 default: /* "%?" prints ?, unless ? is NUL */ 928 if (ch == '\0') 929 goto done; 930 /* pretend it was %c with argument ch */ 931 cp = buf; 932 *cp = ch; 933 size = 1; 934 sign = '\0'; 935 break; 936 } 937 938 /* 939 * All reasonable formats wind up here. At this point, `cp' 940 * points to a string which (if not flags&LADJUST) should be 941 * padded out to `width' places. If flags&ZEROPAD, it should 942 * first be prefixed by any sign or other prefix; otherwise, 943 * it should be blank padded before the prefix is emitted. 944 * After any left-hand padding and prefixing, emit zeroes 945 * required by a decimal [diouxX] precision, then print the 946 * string proper, then emit zeroes required by any leftover 947 * floating precision; finally, if LADJUST, pad with blanks. 948 * 949 * Compute actual size, so we know how much to pad. 950 * size excludes decimal prec; realsz includes it. 951 */ 952 realsz = dprec > size ? dprec : size; 953 if (sign) 954 realsz++; 955 else if (flags & HEXPREFIX) 956 realsz += 2; 957 958 prsize = width > realsz ? width : realsz; 959 if ((unsigned)ret + prsize > INT_MAX) { 960 ret = EOF; 961 goto error; 962 } 963 964 /* right-adjusting blank padding */ 965 if ((flags & (LADJUST|ZEROPAD)) == 0) 966 PAD(width - realsz, blanks); 967 968 /* prefix */ 969 if (sign) { 970 PRINT(&sign, 1); 971 } else if (flags & HEXPREFIX) { 972 ox[0] = '0'; 973 ox[1] = ch; 974 PRINT(ox, 2); 975 } 976 977 /* right-adjusting zero padding */ 978 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 979 PAD(width - realsz, zeroes); 980 981 /* leading zeroes from decimal precision */ 982 PAD(dprec - size, zeroes); 983 984 /* the string or number proper */ 985 #ifdef FLOATING_POINT 986 if ((flags & FPT) == 0) { 987 PRINT(cp, size); 988 } else { /* glue together f_p fragments */ 989 if (ch >= 'f') { /* 'f' or 'g' */ 990 if (_double == 0) { 991 /* kludge for __dtoa irregularity */ 992 PRINT("0", 1); 993 if (expt < ndig || (flags & ALT) != 0) { 994 PRINT(decimal_point, 1); 995 PAD(ndig - 1, zeroes); 996 } 997 } else if (expt <= 0) { 998 PRINT("0", 1); 999 PRINT(decimal_point, 1); 1000 PAD(-expt, zeroes); 1001 PRINT(cp, ndig); 1002 } else if (expt >= ndig) { 1003 PRINT(cp, ndig); 1004 PAD(expt - ndig, zeroes); 1005 if (flags & ALT) 1006 PRINT(decimal_point, 1); 1007 } else { 1008 PRINT(cp, expt); 1009 cp += expt; 1010 PRINT(decimal_point, 1); 1011 PRINT(cp, ndig-expt); 1012 } 1013 } else { /* 'e' or 'E' */ 1014 if (ndig > 1 || flags & ALT) { 1015 ox[0] = *cp++; 1016 ox[1] = *decimal_point; 1017 PRINT(ox, 2); 1018 if (_double) { 1019 PRINT(cp, ndig-1); 1020 } else /* 0.[0..] */ 1021 /* __dtoa irregularity */ 1022 PAD(ndig - 1, zeroes); 1023 } else /* XeYYY */ 1024 PRINT(cp, 1); 1025 PRINT(expstr, expsize); 1026 } 1027 } 1028 #else 1029 PRINT(cp, size); 1030 #endif 1031 /* left-adjusting padding (always blank) */ 1032 if (flags & LADJUST) 1033 PAD(width - realsz, blanks); 1034 1035 /* finally, adjust ret */ 1036 ret += prsize; 1037 1038 FLUSH(); /* copy out the I/O vectors */ 1039 } 1040 done: 1041 FLUSH(); 1042 error: 1043 #ifdef FLOATING_POINT 1044 if (dtoaresult != NULL) 1045 free(dtoaresult); 1046 #endif 1047 if (__sferror(fp)) 1048 ret = EOF; 1049 if ((argtable != NULL) && (argtable != statargtable)) 1050 free (argtable); 1051 return (ret); 1052 /* NOTREACHED */ 1053 } 1054 1055 /* 1056 * Find all arguments when a positional parameter is encountered. Returns a 1057 * table, indexed by argument number, of pointers to each arguments. The 1058 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 1059 * It will be replaces with a malloc-ed one if it overflows. 1060 */ 1061 static void 1062 __find_arguments (const char *fmt0, va_list ap, union arg **argtable) 1063 { 1064 char *fmt; /* format string */ 1065 int ch; /* character from fmt */ 1066 int n, n2; /* handy integer (short term usage) */ 1067 char *cp; /* handy char pointer (short term usage) */ 1068 int flags; /* flags as above */ 1069 int width; /* width from format (%8d), or 0 */ 1070 enum typeid *typetable; /* table of types */ 1071 enum typeid stattypetable [STATIC_ARG_TBL_SIZE]; 1072 int tablesize; /* current size of type table */ 1073 int tablemax; /* largest used index in table */ 1074 int nextarg; /* 1-based argument index */ 1075 1076 /* 1077 * Add an argument type to the table, expanding if necessary. 1078 */ 1079 #define ADDTYPE(type) \ 1080 ((nextarg >= tablesize) ? \ 1081 __grow_type_table(nextarg, &typetable, &tablesize) : 0, \ 1082 (nextarg > tablemax) ? tablemax = nextarg : 0, \ 1083 typetable[nextarg++] = type) 1084 1085 #define ADDSARG() \ 1086 ((flags&INTMAXT) ? ADDTYPE(T_INTMAXT) : \ 1087 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1088 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1089 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ 1090 ((flags&LONGINT) ? ADDTYPE(T_LONG) : ADDTYPE(T_INT)))))) 1091 1092 #define ADDUARG() \ 1093 ((flags&INTMAXT) ? ADDTYPE(T_UINTMAXT) : \ 1094 ((flags&SIZET) ? ADDTYPE(T_SIZET) : \ 1095 ((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \ 1096 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ 1097 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : ADDTYPE(T_U_INT)))))) 1098 1099 /* 1100 * Add * arguments to the type array. 1101 */ 1102 #define ADDASTER() \ 1103 n2 = 0; \ 1104 cp = fmt; \ 1105 while (is_digit(*cp)) { \ 1106 n2 = 10 * n2 + to_digit(*cp); \ 1107 cp++; \ 1108 } \ 1109 if (*cp == '$') { \ 1110 int hold = nextarg; \ 1111 nextarg = n2; \ 1112 ADDTYPE (T_INT); \ 1113 nextarg = hold; \ 1114 fmt = ++cp; \ 1115 } else { \ 1116 ADDTYPE (T_INT); \ 1117 } 1118 fmt = (char *)fmt0; 1119 typetable = stattypetable; 1120 tablesize = STATIC_ARG_TBL_SIZE; 1121 tablemax = 0; 1122 nextarg = 1; 1123 memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 1124 1125 /* 1126 * Scan the format for conversions (`%' character). 1127 */ 1128 for (;;) { 1129 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 1130 /* void */; 1131 if (ch == '\0') 1132 goto done; 1133 fmt++; /* skip over '%' */ 1134 1135 flags = 0; 1136 width = 0; 1137 1138 rflag: ch = *fmt++; 1139 reswitch: switch (ch) { 1140 case ' ': 1141 case '#': 1142 goto rflag; 1143 case '*': 1144 ADDASTER (); 1145 goto rflag; 1146 case '-': 1147 case '+': 1148 case '\'': 1149 goto rflag; 1150 case '.': 1151 if ((ch = *fmt++) == '*') { 1152 ADDASTER (); 1153 goto rflag; 1154 } 1155 while (is_digit(ch)) { 1156 ch = *fmt++; 1157 } 1158 goto reswitch; 1159 case '0': 1160 goto rflag; 1161 case '1': case '2': case '3': case '4': 1162 case '5': case '6': case '7': case '8': case '9': 1163 n = 0; 1164 do { 1165 n = 10 * n + to_digit(ch); 1166 ch = *fmt++; 1167 } while (is_digit(ch)); 1168 if (ch == '$') { 1169 nextarg = n; 1170 goto rflag; 1171 } 1172 width = n; 1173 goto reswitch; 1174 #ifdef FLOATING_POINT 1175 case 'L': 1176 flags |= LONGDBL; 1177 goto rflag; 1178 #endif 1179 case 'h': 1180 if (flags & SHORTINT) { 1181 flags &= ~SHORTINT; 1182 flags |= CHARINT; 1183 } else 1184 flags |= SHORTINT; 1185 goto rflag; 1186 case 'j': 1187 flags |= INTMAXT; 1188 goto rflag; 1189 case 'l': 1190 if (flags & LONGINT) { 1191 flags &= ~LONGINT; 1192 flags |= LLONGINT; 1193 } else 1194 flags |= LONGINT; 1195 goto rflag; 1196 case 'q': 1197 flags |= LLONGINT; /* not necessarily */ 1198 goto rflag; 1199 case 't': 1200 flags |= PTRDIFFT; 1201 goto rflag; 1202 case 'z': 1203 flags |= SIZET; 1204 goto rflag; 1205 case 'c': 1206 ADDTYPE(T_INT); 1207 break; 1208 case 'D': 1209 flags |= LONGINT; 1210 /*FALLTHROUGH*/ 1211 case 'd': 1212 case 'i': 1213 ADDSARG(); 1214 break; 1215 #ifdef FLOATING_POINT 1216 #ifdef HEXFLOAT 1217 case 'a': 1218 case 'A': 1219 #endif 1220 case 'e': 1221 case 'E': 1222 case 'f': 1223 case 'g': 1224 case 'G': 1225 if (flags & LONGDBL) 1226 ADDTYPE(T_LONG_DOUBLE); 1227 else 1228 ADDTYPE(T_DOUBLE); 1229 break; 1230 #endif /* FLOATING_POINT */ 1231 case 'n': 1232 if (flags & INTMAXT) 1233 ADDTYPE(TP_INTMAXT); 1234 else if (flags & PTRDIFFT) 1235 ADDTYPE(TP_PTRDIFFT); 1236 else if (flags & SIZET) 1237 ADDTYPE(TP_SIZET); 1238 else if (flags & LLONGINT) 1239 ADDTYPE(TP_LLONG); 1240 else if (flags & LONGINT) 1241 ADDTYPE(TP_LONG); 1242 else if (flags & SHORTINT) 1243 ADDTYPE(TP_SHORT); 1244 else if (flags & CHARINT) 1245 ADDTYPE(TP_SCHAR); 1246 else 1247 ADDTYPE(TP_INT); 1248 continue; /* no output */ 1249 case 'O': 1250 flags |= LONGINT; 1251 /*FALLTHROUGH*/ 1252 case 'o': 1253 ADDUARG(); 1254 break; 1255 case 'p': 1256 ADDTYPE(TP_VOID); 1257 break; 1258 case 's': 1259 ADDTYPE(TP_CHAR); 1260 break; 1261 case 'U': 1262 flags |= LONGINT; 1263 /*FALLTHROUGH*/ 1264 case 'u': 1265 case 'X': 1266 case 'x': 1267 ADDUARG(); 1268 break; 1269 default: /* "%?" prints ?, unless ? is NUL */ 1270 if (ch == '\0') 1271 goto done; 1272 break; 1273 } 1274 } 1275 done: 1276 /* 1277 * Build the argument table. 1278 */ 1279 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1280 *argtable = (union arg *) 1281 malloc (sizeof (union arg) * (tablemax + 1)); 1282 } 1283 1284 (*argtable) [0].intarg = 0; 1285 for (n = 1; n <= tablemax; n++) { 1286 switch (typetable [n]) { 1287 case T_UNUSED: /* whoops! */ 1288 (*argtable) [n].intarg = va_arg (ap, int); 1289 break; 1290 case TP_SCHAR: 1291 (*argtable) [n].pschararg = va_arg (ap, signed char *); 1292 break; 1293 case TP_SHORT: 1294 (*argtable) [n].pshortarg = va_arg (ap, short *); 1295 break; 1296 case T_INT: 1297 (*argtable) [n].intarg = va_arg (ap, int); 1298 break; 1299 case T_U_INT: 1300 (*argtable) [n].uintarg = va_arg (ap, unsigned int); 1301 break; 1302 case TP_INT: 1303 (*argtable) [n].pintarg = va_arg (ap, int *); 1304 break; 1305 case T_LONG: 1306 (*argtable) [n].longarg = va_arg (ap, long); 1307 break; 1308 case T_U_LONG: 1309 (*argtable) [n].ulongarg = va_arg (ap, unsigned long); 1310 break; 1311 case TP_LONG: 1312 (*argtable) [n].plongarg = va_arg (ap, long *); 1313 break; 1314 case T_LLONG: 1315 (*argtable) [n].longlongarg = va_arg (ap, long long); 1316 break; 1317 case T_U_LLONG: 1318 (*argtable) [n].ulonglongarg = va_arg (ap, unsigned long long); 1319 break; 1320 case TP_LLONG: 1321 (*argtable) [n].plonglongarg = va_arg (ap, long long *); 1322 break; 1323 case T_PTRDIFFT: 1324 (*argtable) [n].ptrdiffarg = va_arg (ap, ptrdiff_t); 1325 break; 1326 case TP_PTRDIFFT: 1327 (*argtable) [n].pptrdiffarg = va_arg (ap, ptrdiff_t *); 1328 break; 1329 case T_SIZET: 1330 (*argtable) [n].sizearg = va_arg (ap, size_t); 1331 break; 1332 case TP_SIZET: 1333 (*argtable) [n].psizearg = va_arg (ap, ssize_t *); 1334 break; 1335 case T_INTMAXT: 1336 (*argtable) [n].intmaxarg = va_arg (ap, intmax_t); 1337 break; 1338 case T_UINTMAXT: 1339 (*argtable) [n].uintmaxarg = va_arg (ap, uintmax_t); 1340 break; 1341 case TP_INTMAXT: 1342 (*argtable) [n].pintmaxarg = va_arg (ap, intmax_t *); 1343 break; 1344 #ifdef FLOATING_POINT 1345 case T_DOUBLE: 1346 (*argtable) [n].doublearg = va_arg (ap, double); 1347 break; 1348 case T_LONG_DOUBLE: 1349 (*argtable) [n].longdoublearg = va_arg (ap, long double); 1350 break; 1351 #endif 1352 case TP_CHAR: 1353 (*argtable) [n].pchararg = va_arg (ap, char *); 1354 break; 1355 case TP_VOID: 1356 (*argtable) [n].pvoidarg = va_arg (ap, void *); 1357 break; 1358 } 1359 } 1360 1361 if ((typetable != NULL) && (typetable != stattypetable)) 1362 free (typetable); 1363 } 1364 1365 /* 1366 * Increase the size of the type table. 1367 */ 1368 static void 1369 __grow_type_table (int nextarg, enum typeid **typetable, int *tablesize) 1370 { 1371 enum typeid *const oldtable = *typetable; 1372 const int oldsize = *tablesize; 1373 enum typeid *newtable; 1374 int newsize = oldsize * 2; 1375 1376 if (newsize < nextarg + 1) 1377 newsize = nextarg + 1; 1378 if (oldsize == STATIC_ARG_TBL_SIZE) { 1379 if ((newtable = malloc(newsize)) == NULL) 1380 abort(); /* XXX handle better */ 1381 bcopy(oldtable, newtable, oldsize); 1382 } else { 1383 if ((newtable = reallocf(oldtable, newsize)) == NULL) 1384 abort(); /* XXX handle better */ 1385 } 1386 memset(&newtable[oldsize], T_UNUSED, newsize - oldsize); 1387 1388 *typetable = newtable; 1389 *tablesize = newsize; 1390 } 1391 1392 1393 #ifdef FLOATING_POINT 1394 1395 extern char *__dtoa __P((double, int, int, int *, int *, char **, char **)); 1396 1397 static char * 1398 cvt(double value, int ndigits, int flags, char *sign, int *decpt, 1399 int ch, int *length, char **dtoaresultp) 1400 { 1401 int mode, dsgn; 1402 char *digits, *bp, *rve; 1403 1404 if (ch == 'f') 1405 mode = 3; /* ndigits after the decimal point */ 1406 else { 1407 /* 1408 * To obtain ndigits after the decimal point for the 'e' 1409 * and 'E' formats, round to ndigits + 1 significant 1410 * figures. 1411 */ 1412 if (ch == 'e' || ch == 'E') 1413 ndigits++; 1414 mode = 2; /* ndigits significant digits */ 1415 } 1416 if (value < 0) { 1417 value = -value; 1418 *sign = '-'; 1419 } else 1420 *sign = '\000'; 1421 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve, 1422 dtoaresultp); 1423 if ((ch != 'g' && ch != 'G') || flags & ALT) { 1424 /* print trailing zeros */ 1425 bp = digits + ndigits; 1426 if (ch == 'f') { 1427 if (*digits == '0' && value) 1428 *decpt = -ndigits + 1; 1429 bp += *decpt; 1430 } 1431 if (value == 0) /* kludge for __dtoa irregularity */ 1432 rve = bp; 1433 while (rve < bp) 1434 *rve++ = '0'; 1435 } 1436 *length = rve - digits; 1437 return (digits); 1438 } 1439 1440 static int 1441 exponent(char *p0, int exp, int fmtch) 1442 { 1443 char *p, *t; 1444 char expbuf[MAXEXP]; 1445 1446 p = p0; 1447 *p++ = fmtch; 1448 if (exp < 0) { 1449 exp = -exp; 1450 *p++ = '-'; 1451 } 1452 else 1453 *p++ = '+'; 1454 t = expbuf + MAXEXP; 1455 if (exp > 9) { 1456 do { 1457 *--t = to_char(exp % 10); 1458 } while ((exp /= 10) > 9); 1459 *--t = to_char(exp); 1460 for (; t < expbuf + MAXEXP; *p++ = *t++); 1461 } 1462 else { 1463 *p++ = '0'; 1464 *p++ = to_char(exp); 1465 } 1466 return (p - p0); 1467 } 1468 #endif /* FLOATING_POINT */ 1469