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 * Copyright (c) 2011 The FreeBSD Foundation 9 * All rights reserved. 10 * Portions of this software were developed by David Chisnall 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)vfprintf.c 8.1 (Berkeley) 6/4/93 38 * $FreeBSD: head/lib/libc/stdio/vfprintf.c 249808 2013-04-23 13:33:13Z emaste $ 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 <errno.h> 52 #include <limits.h> 53 #include <locale.h> 54 #include <stddef.h> 55 #include <stdint.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <wchar.h> 60 #include <printf.h> 61 62 #include <stdarg.h> 63 #include "xlocale_private.h" 64 #include "un-namespace.h" 65 66 #include "libc_private.h" 67 #include "local.h" 68 #include "printflocal.h" 69 70 static int __sprint(FILE *, struct __suio *, locale_t); 71 static int __sbprintf(FILE *, locale_t, const char *, va_list) __printflike(3, 0) 72 __noinline; 73 static char *__wcsconv(wchar_t *, int); 74 75 #define CHAR char 76 #include "printfcommon.h" 77 78 struct grouping_state { 79 char *thousands_sep; /* locale-specific thousands separator */ 80 int thousep_len; /* length of thousands_sep */ 81 const char *grouping; /* locale-specific numeric grouping rules */ 82 int lead; /* sig figs before decimal or group sep */ 83 int nseps; /* number of group separators with ' */ 84 int nrepeats; /* number of repeats of the last group */ 85 }; 86 87 /* 88 * Initialize the thousands' grouping state in preparation to print a 89 * number with ndigits digits. This routine returns the total number 90 * of bytes that will be needed. 91 */ 92 static int 93 grouping_init(struct grouping_state *gs, int ndigits, locale_t loc) 94 { 95 struct lconv *locale; 96 97 locale = localeconv_l(loc); 98 gs->grouping = locale->grouping; 99 gs->thousands_sep = locale->thousands_sep; 100 gs->thousep_len = strlen(gs->thousands_sep); 101 102 gs->nseps = gs->nrepeats = 0; 103 gs->lead = ndigits; 104 while (*gs->grouping != CHAR_MAX) { 105 if (gs->lead <= *gs->grouping) 106 break; 107 gs->lead -= *gs->grouping; 108 if (*(gs->grouping+1)) { 109 gs->nseps++; 110 gs->grouping++; 111 } else 112 gs->nrepeats++; 113 } 114 return ((gs->nseps + gs->nrepeats) * gs->thousep_len); 115 } 116 117 /* 118 * Print a number with thousands' separators. 119 */ 120 static int 121 grouping_print(struct grouping_state *gs, struct io_state *iop, 122 const CHAR *cp, const CHAR *ep, locale_t locale) 123 { 124 const CHAR *cp0 = cp; 125 126 if (io_printandpad(iop, cp, ep, gs->lead, zeroes, locale)) 127 return (-1); 128 cp += gs->lead; 129 while (gs->nseps > 0 || gs->nrepeats > 0) { 130 if (gs->nrepeats > 0) 131 gs->nrepeats--; 132 else { 133 gs->grouping--; 134 gs->nseps--; 135 } 136 if (io_print(iop, gs->thousands_sep, gs->thousep_len, locale)) 137 return (-1); 138 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes, locale)) 139 return (-1); 140 cp += *gs->grouping; 141 } 142 if (cp > ep) 143 cp = ep; 144 return (cp - cp0); 145 } 146 147 /* 148 * Flush out all the vectors defined by the given uio, 149 * then reset it so that it can be reused. 150 */ 151 static int 152 __sprint(FILE *fp, struct __suio *uio, locale_t locale) 153 { 154 int err; 155 156 if (uio->uio_resid == 0) { 157 uio->uio_iovcnt = 0; 158 return (0); 159 } 160 err = __sfvwrite(fp, uio); 161 uio->uio_resid = 0; 162 uio->uio_iovcnt = 0; 163 return (err); 164 } 165 166 /* 167 * Helper function for `fprintf to unbuffered unix file': creates a 168 * temporary buffer. We only work on write-only files; this avoids 169 * worries about ungetc buffers and so forth. 170 */ 171 static int 172 __sbprintf(FILE *fp, locale_t locale, const char *fmt, va_list ap) 173 { 174 int ret; 175 FILE fake = FAKE_FILE; 176 unsigned char buf[BUFSIZ]; 177 178 /* XXX This is probably not needed. */ 179 if (prepwrite(fp) != 0) 180 return (EOF); 181 182 /* copy the important variables */ 183 fake.pub._flags = fp->pub._flags & ~__SNBF; 184 fake.pub._fileno = fp->pub._fileno; 185 fake._cookie = fp->_cookie; 186 fake._write = fp->_write; 187 188 /* set up the buffer */ 189 fake._bf._base = fake.pub._p = buf; 190 fake._bf._size = fake.pub._w = sizeof(buf); 191 fake.pub._lbfsize = 0; /* not actually used, but Just In Case */ 192 193 /* do the work, then copy any error status */ 194 ret = __vfprintf(&fake, locale, fmt, ap); 195 if (ret >= 0 && __fflush(&fake)) 196 ret = EOF; 197 if (fake.pub._flags & __SERR) 198 fp->pub._flags |= __SERR; 199 return (ret); 200 } 201 202 /* 203 * Convert a wide character string argument for the %ls format to a multibyte 204 * string representation. If not -1, prec specifies the maximum number of 205 * bytes to output, and also means that we can't assume that the wide char. 206 * string ends is null-terminated. 207 */ 208 static char * 209 __wcsconv(wchar_t *wcsarg, int prec) 210 { 211 static const mbstate_t initial; 212 mbstate_t mbs; 213 char buf[MB_LEN_MAX]; 214 wchar_t *p; 215 char *convbuf; 216 size_t clen, nbytes; 217 218 /* Allocate space for the maximum number of bytes we could output. */ 219 if (prec < 0) { 220 p = wcsarg; 221 mbs = initial; 222 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 223 if (nbytes == (size_t)-1) 224 return (NULL); 225 } else { 226 /* 227 * Optimisation: if the output precision is small enough, 228 * just allocate enough memory for the maximum instead of 229 * scanning the string. 230 */ 231 if (prec < 128) 232 nbytes = prec; 233 else { 234 nbytes = 0; 235 p = wcsarg; 236 mbs = initial; 237 for (;;) { 238 clen = wcrtomb(buf, *p++, &mbs); 239 if (clen == 0 || clen == (size_t)-1 || 240 nbytes + clen > prec) 241 break; 242 nbytes += clen; 243 } 244 } 245 } 246 if ((convbuf = malloc(nbytes + 1)) == NULL) 247 return (NULL); 248 249 /* Fill the output buffer. */ 250 p = wcsarg; 251 mbs = initial; 252 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 253 nbytes, &mbs)) == (size_t)-1) { 254 free(convbuf); 255 return (NULL); 256 } 257 convbuf[nbytes] = '\0'; 258 return (convbuf); 259 } 260 261 /* 262 * MT-safe version 263 */ 264 int 265 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0, 266 va_list ap) 267 { 268 int ret; 269 FIX_LOCALE(locale); 270 271 FLOCKFILE(fp); 272 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 273 if ((fp->pub._flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 274 fp->pub._fileno >= 0) 275 ret = __sbprintf(fp, locale, fmt0, ap); 276 else 277 ret = __vfprintf(fp, locale, fmt0, ap); 278 FUNLOCKFILE(fp); 279 return (ret); 280 } 281 int 282 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 283 { 284 return vfprintf_l(fp, __get_locale(), fmt0, ap); 285 } 286 287 /* 288 * The size of the buffer we use as scratch space for integer 289 * conversions, among other things. We need enough space to 290 * write a uintmax_t in octal (plus one byte). 291 */ 292 #if UINTMAX_MAX <= UINT64_MAX 293 #define BUF 32 294 #else 295 #error "BUF must be large enough to format a uintmax_t" 296 #endif 297 298 /* 299 * Non-MT-safe version 300 */ 301 int 302 __vfprintf(FILE *fp, locale_t locale, const char *fmt0, va_list ap) 303 { 304 char *fmt; /* format string */ 305 int ch; /* character from fmt */ 306 int n, n2; /* handy integer (short term usage) */ 307 char *cp; /* handy char pointer (short term usage) */ 308 int flags; /* flags as above */ 309 int ret; /* return value accumulator */ 310 int width; /* width from format (%8d), or 0 */ 311 int prec; /* precision from format; <0 for N/A */ 312 char sign; /* sign prefix (' ', '+', '-', or \0) */ 313 struct grouping_state gs; /* thousands' grouping info */ 314 315 #ifndef NO_FLOATING_POINT 316 /* 317 * We can decompose the printed representation of floating 318 * point numbers into several parts, some of which may be empty: 319 * 320 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 321 * A B ---C--- D E F 322 * 323 * A: 'sign' holds this value if present; '\0' otherwise 324 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 325 * C: cp points to the string MMMNNN. Leading and trailing 326 * zeros are not in the string and must be added. 327 * D: expchar holds this character; '\0' if no exponent, e.g. %f 328 * F: at least two digits for decimal, at least one digit for hex 329 */ 330 char *decimal_point; /* locale specific decimal point */ 331 int decpt_len; /* length of decimal_point */ 332 int signflag; /* true if float is negative */ 333 union { /* floating point arguments %[aAeEfFgG] */ 334 double dbl; 335 long double ldbl; 336 } fparg; 337 int expt; /* integer value of exponent */ 338 char expchar; /* exponent character: [eEpP\0] */ 339 char *dtoaend; /* pointer to end of converted digits */ 340 int expsize; /* character count for expstr */ 341 int ndig; /* actual number of digits returned by dtoa */ 342 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 343 char *dtoaresult; /* buffer allocated by dtoa */ 344 #endif 345 u_long ulval; /* integer arguments %[diouxX] */ 346 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 347 int base; /* base for [diouxX] conversion */ 348 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 349 int realsz; /* field size expanded by dprec, sign, etc */ 350 int size; /* size of converted field or string */ 351 int prsize; /* max size of printed field */ 352 const char *xdigs; /* digits for %[xX] conversion */ 353 struct io_state io; /* I/O buffering state */ 354 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 355 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 356 union arg *argtable; /* args, built due to positional arg */ 357 union arg statargtable [STATIC_ARG_TBL_SIZE]; 358 int nextarg; /* 1-based argument index */ 359 va_list orgap; /* original argument pointer */ 360 char *convbuf; /* wide to multibyte conversion result */ 361 362 static const char xdigs_lower[16] = "0123456789abcdef"; 363 static const char xdigs_upper[16] = "0123456789ABCDEF"; 364 365 /* BEWARE, these `goto error' on error. */ 366 #define PRINT(ptr, len) { \ 367 if (io_print(&io, (ptr), (len), locale)) \ 368 goto error; \ 369 } 370 #define PAD(howmany, with) { \ 371 if (io_pad(&io, (howmany), (with), locale)) \ 372 goto error; \ 373 } 374 #define PRINTANDPAD(p, ep, len, with) { \ 375 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 376 goto error; \ 377 } 378 #define FLUSH() { \ 379 if (io_flush(&io, locale)) \ 380 goto error; \ 381 } 382 383 /* 384 * Get the argument indexed by nextarg. If the argument table is 385 * built, use it to get the argument. If its not, get the next 386 * argument (and arguments must be gotten sequentially). 387 */ 388 #define GETARG(type) \ 389 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 390 (nextarg++, va_arg(ap, type))) 391 392 /* 393 * To extend shorts properly, we need both signed and unsigned 394 * argument extraction methods. 395 */ 396 #define SARG() \ 397 (flags&LONGINT ? GETARG(long) : \ 398 flags&SHORTINT ? (long)(short)GETARG(int) : \ 399 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 400 (long)GETARG(int)) 401 #define UARG() \ 402 (flags&LONGINT ? GETARG(u_long) : \ 403 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 404 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 405 (u_long)GETARG(u_int)) 406 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 407 #define SJARG() \ 408 (flags&INTMAXT ? GETARG(intmax_t) : \ 409 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 410 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 411 (intmax_t)GETARG(long long)) 412 #define UJARG() \ 413 (flags&INTMAXT ? GETARG(uintmax_t) : \ 414 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 415 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 416 (uintmax_t)GETARG(unsigned long long)) 417 418 /* 419 * Get * arguments, including the form *nn$. Preserve the nextarg 420 * that the argument can be gotten once the type is determined. 421 */ 422 #define GETASTER(val) \ 423 n2 = 0; \ 424 cp = fmt; \ 425 while (is_digit(*cp)) { \ 426 n2 = 10 * n2 + to_digit(*cp); \ 427 cp++; \ 428 } \ 429 if (*cp == '$') { \ 430 int hold = nextarg; \ 431 if (argtable == NULL) { \ 432 argtable = statargtable; \ 433 if (__find_arguments (fmt0, orgap, &argtable)) { \ 434 ret = EOF; \ 435 goto error; \ 436 } \ 437 } \ 438 nextarg = n2; \ 439 val = GETARG (int); \ 440 nextarg = hold; \ 441 fmt = ++cp; \ 442 } else { \ 443 val = GETARG (int); \ 444 } 445 446 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 447 __use_xprintf = 1; 448 if (__use_xprintf > 0) 449 return (__xvprintf(fp, fmt0, ap)); 450 451 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 452 if (prepwrite(fp) != 0) 453 return (EOF); 454 455 convbuf = NULL; 456 fmt = (char *)fmt0; 457 argtable = NULL; 458 nextarg = 1; 459 va_copy(orgap, ap); 460 io_init(&io, fp); 461 ret = 0; 462 #ifndef NO_FLOATING_POINT 463 dtoaresult = NULL; 464 decimal_point = localeconv_l(locale)->decimal_point; 465 /* The overwhelmingly common case is decpt_len == 1. */ 466 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 467 #endif 468 469 /* 470 * Scan the format for conversions (`%' character). 471 */ 472 for (;;) { 473 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 474 /* void */; 475 if ((n = fmt - cp) != 0) { 476 if ((unsigned)ret + n > INT_MAX) { 477 ret = EOF; 478 errno = EOVERFLOW; 479 goto error; 480 } 481 PRINT(cp, n); 482 ret += n; 483 } 484 if (ch == '\0') 485 goto done; 486 fmt++; /* skip over '%' */ 487 488 flags = 0; 489 dprec = 0; 490 width = 0; 491 prec = -1; 492 gs.grouping = NULL; 493 sign = '\0'; 494 ox[1] = '\0'; 495 496 rflag: ch = *fmt++; 497 reswitch: switch (ch) { 498 case ' ': 499 /*- 500 * ``If the space and + flags both appear, the space 501 * flag will be ignored.'' 502 * -- ANSI X3J11 503 */ 504 if (!sign) 505 sign = ' '; 506 goto rflag; 507 case '#': 508 flags |= ALT; 509 goto rflag; 510 case '*': 511 /*- 512 * ``A negative field width argument is taken as a 513 * - flag followed by a positive field width.'' 514 * -- ANSI X3J11 515 * They don't exclude field widths read from args. 516 */ 517 GETASTER (width); 518 if (width >= 0) 519 goto rflag; 520 width = -width; 521 /* FALLTHROUGH */ 522 case '-': 523 flags |= LADJUST; 524 goto rflag; 525 case '+': 526 sign = '+'; 527 goto rflag; 528 case '\'': 529 flags |= GROUPING; 530 goto rflag; 531 case '.': 532 if ((ch = *fmt++) == '*') { 533 GETASTER (prec); 534 goto rflag; 535 } 536 prec = 0; 537 while (is_digit(ch)) { 538 prec = 10 * prec + to_digit(ch); 539 ch = *fmt++; 540 } 541 goto reswitch; 542 case '0': 543 /*- 544 * ``Note that 0 is taken as a flag, not as the 545 * beginning of a field width.'' 546 * -- ANSI X3J11 547 */ 548 flags |= ZEROPAD; 549 goto rflag; 550 case '1': case '2': case '3': case '4': 551 case '5': case '6': case '7': case '8': case '9': 552 n = 0; 553 do { 554 n = 10 * n + to_digit(ch); 555 ch = *fmt++; 556 } while (is_digit(ch)); 557 if (ch == '$') { 558 nextarg = n; 559 if (argtable == NULL) { 560 argtable = statargtable; 561 if (__find_arguments (fmt0, orgap, 562 &argtable)) { 563 ret = EOF; 564 goto error; 565 } 566 } 567 goto rflag; 568 } 569 width = n; 570 goto reswitch; 571 #ifndef NO_FLOATING_POINT 572 case 'L': 573 flags |= LONGDBL; 574 goto rflag; 575 #endif 576 case 'h': 577 if (flags & SHORTINT) { 578 flags &= ~SHORTINT; 579 flags |= CHARINT; 580 } else 581 flags |= SHORTINT; 582 goto rflag; 583 case 'j': 584 flags |= INTMAXT; 585 goto rflag; 586 case 'l': 587 if (flags & LONGINT) { 588 flags &= ~LONGINT; 589 flags |= LLONGINT; 590 } else 591 flags |= LONGINT; 592 goto rflag; 593 case 'q': 594 flags |= LLONGINT; /* not necessarily */ 595 goto rflag; 596 case 't': 597 flags |= PTRDIFFT; 598 goto rflag; 599 case 'z': 600 flags |= SIZET; 601 goto rflag; 602 case 'C': 603 flags |= LONGINT; 604 /*FALLTHROUGH*/ 605 case 'c': 606 if (flags & LONGINT) { 607 static const mbstate_t initial; 608 mbstate_t mbs; 609 size_t mbseqlen; 610 611 mbs = initial; 612 mbseqlen = wcrtomb(cp = buf, 613 (wchar_t)GETARG(wint_t), &mbs); 614 if (mbseqlen == (size_t)-1) { 615 fp->pub._flags |= __SERR; 616 goto error; 617 } 618 size = (int)mbseqlen; 619 } else { 620 *(cp = buf) = GETARG(int); 621 size = 1; 622 } 623 sign = '\0'; 624 break; 625 case 'D': 626 flags |= LONGINT; 627 /*FALLTHROUGH*/ 628 case 'd': 629 case 'i': 630 if (flags & INTMAX_SIZE) { 631 ujval = SJARG(); 632 if ((intmax_t)ujval < 0) { 633 ujval = -ujval; 634 sign = '-'; 635 } 636 } else { 637 ulval = SARG(); 638 if ((long)ulval < 0) { 639 ulval = -ulval; 640 sign = '-'; 641 } 642 } 643 base = 10; 644 goto number; 645 #ifndef NO_FLOATING_POINT 646 case 'a': 647 case 'A': 648 if (ch == 'a') { 649 ox[1] = 'x'; 650 xdigs = xdigs_lower; 651 expchar = 'p'; 652 } else { 653 ox[1] = 'X'; 654 xdigs = xdigs_upper; 655 expchar = 'P'; 656 } 657 if (prec >= 0) 658 prec++; 659 if (dtoaresult != NULL) 660 freedtoa(dtoaresult); 661 if (flags & LONGDBL) { 662 fparg.ldbl = GETARG(long double); 663 dtoaresult = cp = 664 __hldtoa(fparg.ldbl, xdigs, prec, 665 &expt, &signflag, &dtoaend); 666 } else { 667 fparg.dbl = GETARG(double); 668 dtoaresult = cp = 669 __hdtoa(fparg.dbl, xdigs, prec, 670 &expt, &signflag, &dtoaend); 671 } 672 if (prec < 0) 673 prec = dtoaend - cp; 674 if (expt == INT_MAX) 675 ox[1] = '\0'; 676 goto fp_common; 677 case 'e': 678 case 'E': 679 expchar = ch; 680 if (prec < 0) /* account for digit before decpt */ 681 prec = DEFPREC + 1; 682 else 683 prec++; 684 goto fp_begin; 685 case 'f': 686 case 'F': 687 expchar = '\0'; 688 goto fp_begin; 689 case 'g': 690 case 'G': 691 expchar = ch - ('g' - 'e'); 692 if (prec == 0) 693 prec = 1; 694 fp_begin: 695 if (prec < 0) 696 prec = DEFPREC; 697 if (dtoaresult != NULL) 698 freedtoa(dtoaresult); 699 if (flags & LONGDBL) { 700 fparg.ldbl = GETARG(long double); 701 dtoaresult = cp = 702 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 703 &expt, &signflag, &dtoaend); 704 } else { 705 fparg.dbl = GETARG(double); 706 dtoaresult = cp = 707 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 708 &expt, &signflag, &dtoaend); 709 if (expt == 9999) 710 expt = INT_MAX; 711 } 712 fp_common: 713 if (signflag) 714 sign = '-'; 715 if (expt == INT_MAX) { /* inf or nan */ 716 if (*cp == 'N') { 717 cp = (ch >= 'a') ? "nan" : "NAN"; 718 sign = '\0'; 719 } else 720 cp = (ch >= 'a') ? "inf" : "INF"; 721 size = 3; 722 flags &= ~ZEROPAD; 723 break; 724 } 725 flags |= FPT; 726 ndig = dtoaend - cp; 727 if (ch == 'g' || ch == 'G') { 728 if (expt > -4 && expt <= prec) { 729 /* Make %[gG] smell like %[fF] */ 730 expchar = '\0'; 731 if (flags & ALT) 732 prec -= expt; 733 else 734 prec = ndig - expt; 735 if (prec < 0) 736 prec = 0; 737 } else { 738 /* 739 * Make %[gG] smell like %[eE], but 740 * trim trailing zeroes if no # flag. 741 */ 742 if (!(flags & ALT)) 743 prec = ndig; 744 } 745 } 746 if (expchar) { 747 expsize = exponent(expstr, expt - 1, expchar); 748 size = expsize + prec; 749 if (prec > 1 || flags & ALT) 750 size += decpt_len; 751 } else { 752 /* space for digits before decimal point */ 753 if (expt > 0) 754 size = expt; 755 else /* "0" */ 756 size = 1; 757 /* space for decimal pt and following digits */ 758 if (prec || flags & ALT) 759 size += prec + decpt_len; 760 if ((flags & GROUPING) && expt > 0) 761 size += grouping_init(&gs, expt, locale); 762 } 763 break; 764 #endif /* !NO_FLOATING_POINT */ 765 case 'n': 766 /* 767 * Assignment-like behavior is specified if the 768 * value overflows or is otherwise unrepresentable. 769 * C99 says to use `signed char' for %hhn conversions. 770 */ 771 if (flags & LLONGINT) 772 *GETARG(long long *) = ret; 773 else if (flags & SIZET) 774 *GETARG(ssize_t *) = (ssize_t)ret; 775 else if (flags & PTRDIFFT) 776 *GETARG(ptrdiff_t *) = ret; 777 else if (flags & INTMAXT) 778 *GETARG(intmax_t *) = ret; 779 else if (flags & LONGINT) 780 *GETARG(long *) = ret; 781 else if (flags & SHORTINT) 782 *GETARG(short *) = ret; 783 else if (flags & CHARINT) 784 *GETARG(signed char *) = ret; 785 else 786 *GETARG(int *) = ret; 787 continue; /* no output */ 788 case 'O': 789 flags |= LONGINT; 790 /*FALLTHROUGH*/ 791 case 'o': 792 if (flags & INTMAX_SIZE) 793 ujval = UJARG(); 794 else 795 ulval = UARG(); 796 base = 8; 797 goto nosign; 798 case 'p': 799 /*- 800 * ``The argument shall be a pointer to void. The 801 * value of the pointer is converted to a sequence 802 * of printable characters, in an implementation- 803 * defined manner.'' 804 * -- ANSI X3J11 805 */ 806 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 807 base = 16; 808 xdigs = xdigs_lower; 809 flags = flags | INTMAXT; 810 ox[1] = 'x'; 811 goto nosign; 812 case 'S': 813 flags |= LONGINT; 814 /*FALLTHROUGH*/ 815 case 's': 816 if (flags & LONGINT) { 817 wchar_t *wcp; 818 819 if (convbuf != NULL) 820 free(convbuf); 821 if ((wcp = GETARG(wchar_t *)) == NULL) 822 cp = "(null)"; 823 else { 824 convbuf = __wcsconv(wcp, prec); 825 if (convbuf == NULL) { 826 fp->pub._flags |= __SERR; 827 goto error; 828 } 829 cp = convbuf; 830 } 831 } else if ((cp = GETARG(char *)) == NULL) 832 cp = "(null)"; 833 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 834 sign = '\0'; 835 break; 836 case 'U': 837 flags |= LONGINT; 838 /*FALLTHROUGH*/ 839 case 'u': 840 if (flags & INTMAX_SIZE) 841 ujval = UJARG(); 842 else 843 ulval = UARG(); 844 base = 10; 845 goto nosign; 846 case 'X': 847 xdigs = xdigs_upper; 848 goto hex; 849 case 'x': 850 xdigs = xdigs_lower; 851 hex: 852 if (flags & INTMAX_SIZE) 853 ujval = UJARG(); 854 else 855 ulval = UARG(); 856 base = 16; 857 /* leading 0x/X only if non-zero */ 858 if (flags & ALT && 859 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 860 ox[1] = ch; 861 862 flags &= ~GROUPING; 863 /* unsigned conversions */ 864 nosign: sign = '\0'; 865 /*- 866 * ``... diouXx conversions ... if a precision is 867 * specified, the 0 flag will be ignored.'' 868 * -- ANSI X3J11 869 */ 870 number: if ((dprec = prec) >= 0) 871 flags &= ~ZEROPAD; 872 873 /*- 874 * ``The result of converting a zero value with an 875 * explicit precision of zero is no characters.'' 876 * -- ANSI X3J11 877 * 878 * ``The C Standard is clear enough as is. The call 879 * printf("%#.0o", 0) should print 0.'' 880 * -- Defect Report #151 881 */ 882 cp = buf + BUF; 883 if (flags & INTMAX_SIZE) { 884 if (ujval != 0 || prec != 0 || 885 (flags & ALT && base == 8)) 886 cp = __ujtoa(ujval, cp, base, 887 flags & ALT, xdigs); 888 } else { 889 if (ulval != 0 || prec != 0 || 890 (flags & ALT && base == 8)) 891 cp = __ultoa(ulval, cp, base, 892 flags & ALT, xdigs); 893 } 894 size = buf + BUF - cp; 895 if (size > BUF) /* should never happen */ 896 abort(); 897 if ((flags & GROUPING) && size != 0) 898 size += grouping_init(&gs, size, locale); 899 break; 900 default: /* "%?" prints ?, unless ? is NUL */ 901 if (ch == '\0') 902 goto done; 903 /* pretend it was %c with argument ch */ 904 cp = buf; 905 *cp = ch; 906 size = 1; 907 sign = '\0'; 908 break; 909 } 910 911 /* 912 * All reasonable formats wind up here. At this point, `cp' 913 * points to a string which (if not flags&LADJUST) should be 914 * padded out to `width' places. If flags&ZEROPAD, it should 915 * first be prefixed by any sign or other prefix; otherwise, 916 * it should be blank padded before the prefix is emitted. 917 * After any left-hand padding and prefixing, emit zeroes 918 * required by a decimal [diouxX] precision, then print the 919 * string proper, then emit zeroes required by any leftover 920 * floating precision; finally, if LADJUST, pad with blanks. 921 * 922 * Compute actual size, so we know how much to pad. 923 * size excludes decimal prec; realsz includes it. 924 */ 925 realsz = dprec > size ? dprec : size; 926 if (sign) 927 realsz++; 928 if (ox[1]) 929 realsz += 2; 930 931 prsize = width > realsz ? width : realsz; 932 if ((unsigned)ret + prsize > INT_MAX) { 933 ret = EOF; 934 errno = EOVERFLOW; 935 goto error; 936 } 937 938 /* right-adjusting blank padding */ 939 if ((flags & (LADJUST|ZEROPAD)) == 0) 940 PAD(width - realsz, blanks); 941 942 /* prefix */ 943 if (sign) 944 PRINT(&sign, 1); 945 946 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 947 ox[0] = '0'; 948 PRINT(ox, 2); 949 } 950 951 /* right-adjusting zero padding */ 952 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 953 PAD(width - realsz, zeroes); 954 955 /* the string or number proper */ 956 #ifndef NO_FLOATING_POINT 957 if ((flags & FPT) == 0) { 958 #endif 959 /* leading zeroes from decimal precision */ 960 PAD(dprec - size, zeroes); 961 if (gs.grouping) { 962 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 963 goto error; 964 } else { 965 PRINT(cp, size); 966 } 967 #ifndef NO_FLOATING_POINT 968 } else { /* glue together f_p fragments */ 969 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 970 if (expt <= 0) { 971 PRINT(zeroes, 1); 972 if (prec || flags & ALT) 973 PRINT(decimal_point,decpt_len); 974 PAD(-expt, zeroes); 975 /* already handled initial 0's */ 976 prec += expt; 977 } else { 978 if (gs.grouping) { 979 n = grouping_print(&gs, &io, 980 cp, dtoaend, locale); 981 if (n < 0) 982 goto error; 983 cp += n; 984 } else { 985 PRINTANDPAD(cp, dtoaend, 986 expt, zeroes); 987 cp += expt; 988 } 989 if (prec || flags & ALT) 990 PRINT(decimal_point,decpt_len); 991 } 992 PRINTANDPAD(cp, dtoaend, prec, zeroes); 993 } else { /* %[eE] or sufficiently long %[gG] */ 994 if (prec > 1 || flags & ALT) { 995 PRINT(cp++, 1); 996 PRINT(decimal_point, decpt_len); 997 PRINT(cp, ndig-1); 998 PAD(prec - ndig, zeroes); 999 } else /* XeYYY */ 1000 PRINT(cp, 1); 1001 PRINT(expstr, expsize); 1002 } 1003 } 1004 #endif 1005 /* left-adjusting padding (always blank) */ 1006 if (flags & LADJUST) 1007 PAD(width - realsz, blanks); 1008 1009 /* finally, adjust ret */ 1010 ret += prsize; 1011 1012 FLUSH(); /* copy out the I/O vectors */ 1013 } 1014 done: 1015 FLUSH(); 1016 error: 1017 va_end(orgap); 1018 #ifndef NO_FLOATING_POINT 1019 if (dtoaresult != NULL) 1020 freedtoa(dtoaresult); 1021 #endif 1022 if (convbuf != NULL) 1023 free(convbuf); 1024 if (__sferror(fp)) 1025 ret = EOF; 1026 if ((argtable != NULL) && (argtable != statargtable)) 1027 free (argtable); 1028 return (ret); 1029 /* NOTREACHED */ 1030 } 1031 1032