1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Copyright (c) 2011 The FreeBSD Foundation 11 * 12 * Portions of this software were developed by David Chisnall 13 * under sponsorship from the FreeBSD Foundation. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #if defined(LIBC_SCCS) && !defined(lint) 41 static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93"; 42 #endif /* LIBC_SCCS and not lint */ 43 #include <sys/cdefs.h> 44 /* 45 * Actual printf innards. 46 * 47 * This code is large and complicated... 48 */ 49 50 #include "namespace.h" 51 #include <sys/types.h> 52 53 #include <ctype.h> 54 #include <errno.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 #include <wchar.h> 63 #include <printf.h> 64 65 #include <stdarg.h> 66 #include "xlocale_private.h" 67 #include "un-namespace.h" 68 69 #include "libc_private.h" 70 #include "local.h" 71 #include "fvwrite.h" 72 #include "printflocal.h" 73 74 static int __sprint(FILE *, struct __suio *, locale_t); 75 static int __sbprintf(FILE *, locale_t, const char *, va_list) __printflike(3, 0) 76 __noinline; 77 static char *__wcsconv(wchar_t *, int); 78 79 #define CHAR char 80 #include "printfcommon.h" 81 82 struct grouping_state { 83 char *thousands_sep; /* locale-specific thousands separator */ 84 int thousep_len; /* length of thousands_sep */ 85 const char *grouping; /* locale-specific numeric grouping rules */ 86 int lead; /* sig figs before decimal or group sep */ 87 int nseps; /* number of group separators with ' */ 88 int nrepeats; /* number of repeats of the last group */ 89 }; 90 91 /* 92 * Initialize the thousands' grouping state in preparation to print a 93 * number with ndigits digits. This routine returns the total number 94 * of bytes that will be needed. 95 */ 96 static int 97 grouping_init(struct grouping_state *gs, int ndigits, locale_t loc) 98 { 99 struct lconv *locale; 100 101 locale = localeconv_l(loc); 102 gs->grouping = locale->grouping; 103 gs->thousands_sep = locale->thousands_sep; 104 gs->thousep_len = strlen(gs->thousands_sep); 105 106 gs->nseps = gs->nrepeats = 0; 107 gs->lead = ndigits; 108 while (*gs->grouping != CHAR_MAX) { 109 if (gs->lead <= *gs->grouping) 110 break; 111 gs->lead -= *gs->grouping; 112 if (*(gs->grouping+1)) { 113 gs->nseps++; 114 gs->grouping++; 115 } else 116 gs->nrepeats++; 117 } 118 return ((gs->nseps + gs->nrepeats) * gs->thousep_len); 119 } 120 121 /* 122 * Print a number with thousands' separators. 123 */ 124 static int 125 grouping_print(struct grouping_state *gs, struct io_state *iop, 126 const CHAR *cp, const CHAR *ep, locale_t locale) 127 { 128 const CHAR *cp0 = cp; 129 130 if (io_printandpad(iop, cp, ep, gs->lead, zeroes, locale)) 131 return (-1); 132 cp += gs->lead; 133 while (gs->nseps > 0 || gs->nrepeats > 0) { 134 if (gs->nrepeats > 0) 135 gs->nrepeats--; 136 else { 137 gs->grouping--; 138 gs->nseps--; 139 } 140 if (io_print(iop, gs->thousands_sep, gs->thousep_len, locale)) 141 return (-1); 142 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes, locale)) 143 return (-1); 144 cp += *gs->grouping; 145 } 146 if (cp > ep) 147 cp = ep; 148 return (cp - cp0); 149 } 150 151 /* 152 * Flush out all the vectors defined by the given uio, 153 * then reset it so that it can be reused. 154 */ 155 static int 156 __sprint(FILE *fp, struct __suio *uio, locale_t locale) 157 { 158 int err; 159 160 if (uio->uio_resid == 0) { 161 uio->uio_iovcnt = 0; 162 return (0); 163 } 164 err = __sfvwrite(fp, uio); 165 uio->uio_resid = 0; 166 uio->uio_iovcnt = 0; 167 return (err); 168 } 169 170 /* 171 * Helper function for `fprintf to unbuffered unix file': creates a 172 * temporary buffer. We only work on write-only files; this avoids 173 * worries about ungetc buffers and so forth. 174 */ 175 static int 176 __sbprintf(FILE *fp, locale_t locale, const char *fmt, va_list ap) 177 { 178 int ret; 179 FILE fake = FAKE_FILE; 180 unsigned char buf[BUFSIZ]; 181 182 /* XXX This is probably not needed. */ 183 if (prepwrite(fp) != 0) 184 return (EOF); 185 186 /* copy the important variables */ 187 fake._flags = fp->_flags & ~__SNBF; 188 fake._file = fp->_file; 189 fake._cookie = fp->_cookie; 190 fake._write = fp->_write; 191 fake._orientation = fp->_orientation; 192 fake._mbstate = fp->_mbstate; 193 194 /* set up the buffer */ 195 fake._bf._base = fake._p = buf; 196 fake._bf._size = fake._w = sizeof(buf); 197 fake._lbfsize = 0; /* not actually used, but Just In Case */ 198 199 /* do the work, then copy any error status */ 200 ret = __vfprintf(&fake, locale, fmt, ap); 201 if (ret >= 0 && __fflush(&fake)) 202 ret = EOF; 203 if (fake._flags & __SERR) 204 fp->_flags |= __SERR; 205 return (ret); 206 } 207 208 /* 209 * Convert a wide character string argument for the %ls format to a multibyte 210 * string representation. If not -1, prec specifies the maximum number of 211 * bytes to output, and also means that we can't assume that the wide char. 212 * string ends is null-terminated. 213 */ 214 static char * 215 __wcsconv(wchar_t *wcsarg, int prec) 216 { 217 static const mbstate_t initial; 218 mbstate_t mbs; 219 char buf[MB_LEN_MAX]; 220 wchar_t *p; 221 char *convbuf; 222 size_t clen, nbytes; 223 224 /* Allocate space for the maximum number of bytes we could output. */ 225 if (prec < 0) { 226 p = wcsarg; 227 mbs = initial; 228 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 229 if (nbytes == (size_t)-1) 230 return (NULL); 231 } else { 232 /* 233 * Optimisation: if the output precision is small enough, 234 * just allocate enough memory for the maximum instead of 235 * scanning the string. 236 */ 237 if (prec < 128) 238 nbytes = prec; 239 else { 240 nbytes = 0; 241 p = wcsarg; 242 mbs = initial; 243 for (;;) { 244 clen = wcrtomb(buf, *p++, &mbs); 245 if (clen == 0 || clen == (size_t)-1 || 246 nbytes + clen > prec) 247 break; 248 nbytes += clen; 249 } 250 } 251 } 252 if ((convbuf = malloc(nbytes + 1)) == NULL) 253 return (NULL); 254 255 /* Fill the output buffer. */ 256 p = wcsarg; 257 mbs = initial; 258 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 259 nbytes, &mbs)) == (size_t)-1) { 260 free(convbuf); 261 return (NULL); 262 } 263 convbuf[nbytes] = '\0'; 264 return (convbuf); 265 } 266 267 /* 268 * MT-safe version 269 */ 270 int 271 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0, 272 va_list ap) 273 { 274 int ret; 275 FIX_LOCALE(locale); 276 277 FLOCKFILE_CANCELSAFE(fp); 278 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 279 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 280 fp->_file >= 0) 281 ret = __sbprintf(fp, locale, fmt0, ap); 282 else 283 ret = __vfprintf(fp, locale, fmt0, ap); 284 FUNLOCKFILE_CANCELSAFE(); 285 return (ret); 286 } 287 int 288 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 289 { 290 return vfprintf_l(fp, __get_locale(), fmt0, ap); 291 } 292 293 /* 294 * The size of the buffer we use as scratch space for integer 295 * conversions, among other things. We need enough space to 296 * write a uintmax_t in octal (plus one byte). 297 */ 298 #if UINTMAX_MAX <= UINT64_MAX 299 #define BUF 32 300 #else 301 #error "BUF must be large enough to format a uintmax_t" 302 #endif 303 304 /* 305 * Non-MT-safe version 306 */ 307 int 308 __vfprintf(FILE *fp, locale_t locale, const char *fmt0, va_list ap) 309 { 310 char *fmt; /* format string */ 311 int ch; /* character from fmt */ 312 int n, n2; /* handy integer (short term usage) */ 313 char *cp; /* handy char pointer (short term usage) */ 314 int flags; /* flags as above */ 315 int ret; /* return value accumulator */ 316 int width; /* width from format (%8d), or 0 */ 317 int prec; /* precision from format; <0 for N/A */ 318 int saved_errno; 319 char sign; /* sign prefix (' ', '+', '-', or \0) */ 320 struct grouping_state gs; /* thousands' grouping info */ 321 322 #ifndef NO_FLOATING_POINT 323 /* 324 * We can decompose the printed representation of floating 325 * point numbers into several parts, some of which may be empty: 326 * 327 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 328 * A B ---C--- D E F 329 * 330 * A: 'sign' holds this value if present; '\0' otherwise 331 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 332 * C: cp points to the string MMMNNN. Leading and trailing 333 * zeros are not in the string and must be added. 334 * D: expchar holds this character; '\0' if no exponent, e.g. %f 335 * F: at least two digits for decimal, at least one digit for hex 336 */ 337 char *decimal_point; /* locale specific decimal point */ 338 int decpt_len; /* length of decimal_point */ 339 int signflag; /* true if float is negative */ 340 union { /* floating point arguments %[aAeEfFgG] */ 341 double dbl; 342 long double ldbl; 343 } fparg; 344 int expt; /* integer value of exponent */ 345 char expchar; /* exponent character: [eEpP\0] */ 346 char *dtoaend; /* pointer to end of converted digits */ 347 int expsize; /* character count for expstr */ 348 int ndig; /* actual number of digits returned by dtoa */ 349 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 350 char *dtoaresult; /* buffer allocated by dtoa */ 351 #endif 352 u_long ulval; /* integer arguments %[diouxX] */ 353 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 354 int base; /* base for [diouxX] conversion */ 355 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 356 int realsz; /* field size expanded by dprec, sign, etc */ 357 int size; /* size of converted field or string */ 358 int prsize; /* max size of printed field */ 359 const char *xdigs; /* digits for %[xX] conversion */ 360 struct io_state io; /* I/O buffering state */ 361 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 362 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 363 union arg *argtable; /* args, built due to positional arg */ 364 union arg statargtable [STATIC_ARG_TBL_SIZE]; 365 int nextarg; /* 1-based argument index */ 366 va_list orgap; /* original argument pointer */ 367 char *convbuf; /* wide to multibyte conversion result */ 368 int savserr; 369 370 static const char xdigs_lower[16] = "0123456789abcdef"; 371 static const char xdigs_upper[16] = "0123456789ABCDEF"; 372 373 /* BEWARE, these `goto error' on error. */ 374 #define PRINT(ptr, len) { \ 375 if (io_print(&io, (ptr), (len), locale)) \ 376 goto error; \ 377 } 378 #define PAD(howmany, with) { \ 379 if (io_pad(&io, (howmany), (with), locale)) \ 380 goto error; \ 381 } 382 #define PRINTANDPAD(p, ep, len, with) { \ 383 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 384 goto error; \ 385 } 386 #define FLUSH() { \ 387 if (io_flush(&io, locale)) \ 388 goto error; \ 389 } 390 391 /* 392 * Get the argument indexed by nextarg. If the argument table is 393 * built, use it to get the argument. If its not, get the next 394 * argument (and arguments must be gotten sequentially). 395 */ 396 #define GETARG(type) \ 397 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 398 (nextarg++, va_arg(ap, type))) 399 400 /* 401 * To extend shorts properly, we need both signed and unsigned 402 * argument extraction methods. 403 */ 404 #define SARG() \ 405 (flags&LONGINT ? GETARG(long) : \ 406 flags&SHORTINT ? (long)(short)GETARG(int) : \ 407 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 408 (long)GETARG(int)) 409 #define UARG() \ 410 (flags&LONGINT ? GETARG(u_long) : \ 411 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 412 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 413 (u_long)GETARG(u_int)) 414 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 415 #define SJARG() \ 416 (flags&INTMAXT ? GETARG(intmax_t) : \ 417 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 418 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 419 (intmax_t)GETARG(long long)) 420 #define UJARG() \ 421 (flags&INTMAXT ? GETARG(uintmax_t) : \ 422 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 423 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 424 (uintmax_t)GETARG(unsigned long long)) 425 426 /* 427 * Get * arguments, including the form *nn$. Preserve the nextarg 428 * that the argument can be gotten once the type is determined. 429 */ 430 #define GETASTER(val) \ 431 n2 = 0; \ 432 cp = fmt; \ 433 while (is_digit(*cp)) { \ 434 n2 = 10 * n2 + to_digit(*cp); \ 435 cp++; \ 436 } \ 437 if (*cp == '$') { \ 438 int hold = nextarg; \ 439 if (argtable == NULL) { \ 440 argtable = statargtable; \ 441 if (__find_arguments (fmt0, orgap, &argtable)) { \ 442 ret = EOF; \ 443 goto error; \ 444 } \ 445 } \ 446 nextarg = n2; \ 447 val = GETARG (int); \ 448 nextarg = hold; \ 449 fmt = ++cp; \ 450 } else { \ 451 val = GETARG (int); \ 452 } 453 454 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 455 __use_xprintf = 1; 456 if (__use_xprintf > 0) 457 return (__xvprintf(fp, fmt0, ap)); 458 459 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 460 if (prepwrite(fp) != 0) { 461 errno = EBADF; 462 return (EOF); 463 } 464 465 savserr = fp->_flags & __SERR; 466 fp->_flags &= ~__SERR; 467 468 saved_errno = errno; 469 convbuf = NULL; 470 fmt = (char *)fmt0; 471 argtable = NULL; 472 nextarg = 1; 473 va_copy(orgap, ap); 474 io_init(&io, fp); 475 ret = 0; 476 #ifndef NO_FLOATING_POINT 477 dtoaresult = NULL; 478 decimal_point = localeconv_l(locale)->decimal_point; 479 /* The overwhelmingly common case is decpt_len == 1. */ 480 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 481 #endif 482 483 /* 484 * Scan the format for conversions (`%' character). 485 */ 486 for (;;) { 487 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 488 /* void */; 489 if ((n = fmt - cp) != 0) { 490 if ((unsigned)ret + n > INT_MAX) { 491 ret = EOF; 492 errno = EOVERFLOW; 493 goto error; 494 } 495 PRINT(cp, n); 496 ret += n; 497 } 498 if (ch == '\0') 499 goto done; 500 fmt++; /* skip over '%' */ 501 502 flags = 0; 503 dprec = 0; 504 width = 0; 505 prec = -1; 506 gs.grouping = NULL; 507 sign = '\0'; 508 ox[1] = '\0'; 509 510 rflag: ch = *fmt++; 511 reswitch: switch (ch) { 512 case ' ': 513 /*- 514 * ``If the space and + flags both appear, the space 515 * flag will be ignored.'' 516 * -- ANSI X3J11 517 */ 518 if (!sign) 519 sign = ' '; 520 goto rflag; 521 case '#': 522 flags |= ALT; 523 goto rflag; 524 case '*': 525 /*- 526 * ``A negative field width argument is taken as a 527 * - flag followed by a positive field width.'' 528 * -- ANSI X3J11 529 * They don't exclude field widths read from args. 530 */ 531 GETASTER (width); 532 if (width >= 0) 533 goto rflag; 534 width = -width; 535 /* FALLTHROUGH */ 536 case '-': 537 flags |= LADJUST; 538 goto rflag; 539 case '+': 540 sign = '+'; 541 goto rflag; 542 case '\'': 543 flags |= GROUPING; 544 goto rflag; 545 case '.': 546 if ((ch = *fmt++) == '*') { 547 GETASTER (prec); 548 goto rflag; 549 } 550 prec = 0; 551 while (is_digit(ch)) { 552 prec = 10 * prec + to_digit(ch); 553 ch = *fmt++; 554 } 555 goto reswitch; 556 case '0': 557 /*- 558 * ``Note that 0 is taken as a flag, not as the 559 * beginning of a field width.'' 560 * -- ANSI X3J11 561 */ 562 flags |= ZEROPAD; 563 goto rflag; 564 case '1': case '2': case '3': case '4': 565 case '5': case '6': case '7': case '8': case '9': 566 n = 0; 567 do { 568 n = 10 * n + to_digit(ch); 569 ch = *fmt++; 570 } while (is_digit(ch)); 571 if (ch == '$') { 572 nextarg = n; 573 if (argtable == NULL) { 574 argtable = statargtable; 575 if (__find_arguments (fmt0, orgap, 576 &argtable)) { 577 ret = EOF; 578 goto error; 579 } 580 } 581 goto rflag; 582 } 583 width = n; 584 goto reswitch; 585 #ifndef NO_FLOATING_POINT 586 case 'L': 587 flags |= LONGDBL; 588 goto rflag; 589 #endif 590 case 'h': 591 if (flags & SHORTINT) { 592 flags &= ~SHORTINT; 593 flags |= CHARINT; 594 } else 595 flags |= SHORTINT; 596 goto rflag; 597 case 'j': 598 flags |= INTMAXT; 599 goto rflag; 600 case 'l': 601 if (flags & LONGINT) { 602 flags &= ~LONGINT; 603 flags |= LLONGINT; 604 } else 605 flags |= LONGINT; 606 goto rflag; 607 case 'q': 608 flags |= LLONGINT; /* not necessarily */ 609 goto rflag; 610 case 't': 611 flags |= PTRDIFFT; 612 goto rflag; 613 case 'z': 614 flags |= SIZET; 615 goto rflag; 616 case 'C': 617 flags |= LONGINT; 618 /*FALLTHROUGH*/ 619 case 'c': 620 if (flags & LONGINT) { 621 static const mbstate_t initial; 622 mbstate_t mbs; 623 size_t mbseqlen; 624 625 mbs = initial; 626 mbseqlen = wcrtomb(cp = buf, 627 (wchar_t)GETARG(wint_t), &mbs); 628 if (mbseqlen == (size_t)-1) { 629 fp->_flags |= __SERR; 630 goto error; 631 } 632 size = (int)mbseqlen; 633 } else { 634 *(cp = buf) = GETARG(int); 635 size = 1; 636 } 637 sign = '\0'; 638 break; 639 case 'D': 640 flags |= LONGINT; 641 /*FALLTHROUGH*/ 642 case 'd': 643 case 'i': 644 if (flags & INTMAX_SIZE) { 645 ujval = SJARG(); 646 if ((intmax_t)ujval < 0) { 647 ujval = -ujval; 648 sign = '-'; 649 } 650 } else { 651 ulval = SARG(); 652 if ((long)ulval < 0) { 653 ulval = -ulval; 654 sign = '-'; 655 } 656 } 657 base = 10; 658 goto number; 659 #ifndef NO_FLOATING_POINT 660 case 'a': 661 case 'A': 662 if (ch == 'a') { 663 ox[1] = 'x'; 664 xdigs = xdigs_lower; 665 expchar = 'p'; 666 } else { 667 ox[1] = 'X'; 668 xdigs = xdigs_upper; 669 expchar = 'P'; 670 } 671 if (prec >= 0) 672 prec++; 673 if (dtoaresult != NULL) 674 freedtoa(dtoaresult); 675 if (flags & LONGDBL) { 676 fparg.ldbl = GETARG(long double); 677 dtoaresult = cp = 678 __hldtoa(fparg.ldbl, xdigs, prec, 679 &expt, &signflag, &dtoaend); 680 } else { 681 fparg.dbl = GETARG(double); 682 dtoaresult = cp = 683 __hdtoa(fparg.dbl, xdigs, prec, 684 &expt, &signflag, &dtoaend); 685 } 686 if (prec < 0) 687 prec = dtoaend - cp; 688 if (expt == INT_MAX) 689 ox[1] = '\0'; 690 goto fp_common; 691 case 'e': 692 case 'E': 693 expchar = ch; 694 if (prec < 0) /* account for digit before decpt */ 695 prec = DEFPREC + 1; 696 else 697 prec++; 698 goto fp_begin; 699 case 'f': 700 case 'F': 701 expchar = '\0'; 702 goto fp_begin; 703 case 'g': 704 case 'G': 705 expchar = ch - ('g' - 'e'); 706 if (prec == 0) 707 prec = 1; 708 fp_begin: 709 if (prec < 0) 710 prec = DEFPREC; 711 if (dtoaresult != NULL) 712 freedtoa(dtoaresult); 713 if (flags & LONGDBL) { 714 fparg.ldbl = GETARG(long double); 715 dtoaresult = cp = 716 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 717 &expt, &signflag, &dtoaend); 718 } else { 719 fparg.dbl = GETARG(double); 720 dtoaresult = cp = 721 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 722 &expt, &signflag, &dtoaend); 723 if (expt == 9999) 724 expt = INT_MAX; 725 } 726 fp_common: 727 if (signflag) 728 sign = '-'; 729 if (expt == INT_MAX) { /* inf or nan */ 730 if (*cp == 'N') { 731 cp = (ch >= 'a') ? "nan" : "NAN"; 732 sign = '\0'; 733 } else 734 cp = (ch >= 'a') ? "inf" : "INF"; 735 size = 3; 736 flags &= ~ZEROPAD; 737 break; 738 } 739 flags |= FPT; 740 ndig = dtoaend - cp; 741 if (ch == 'g' || ch == 'G') { 742 if (expt > -4 && expt <= prec) { 743 /* Make %[gG] smell like %[fF] */ 744 expchar = '\0'; 745 if (flags & ALT) 746 prec -= expt; 747 else 748 prec = ndig - expt; 749 if (prec < 0) 750 prec = 0; 751 } else { 752 /* 753 * Make %[gG] smell like %[eE], but 754 * trim trailing zeroes if no # flag. 755 */ 756 if (!(flags & ALT)) 757 prec = ndig; 758 } 759 } 760 if (expchar) { 761 expsize = exponent(expstr, expt - 1, expchar); 762 size = expsize + prec; 763 if (prec > 1 || flags & ALT) 764 size += decpt_len; 765 } else { 766 /* space for digits before decimal point */ 767 if (expt > 0) 768 size = expt; 769 else /* "0" */ 770 size = 1; 771 /* space for decimal pt and following digits */ 772 if (prec || flags & ALT) 773 size += prec + decpt_len; 774 if ((flags & GROUPING) && expt > 0) 775 size += grouping_init(&gs, expt, locale); 776 } 777 break; 778 #endif /* !NO_FLOATING_POINT */ 779 case 'm': 780 cp = strerror(saved_errno); 781 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 782 sign = '\0'; 783 break; 784 case 'n': 785 /* 786 * Assignment-like behavior is specified if the 787 * value overflows or is otherwise unrepresentable. 788 * C99 says to use `signed char' for %hhn conversions. 789 */ 790 if (flags & LLONGINT) 791 *GETARG(long long *) = ret; 792 else if (flags & SIZET) 793 *GETARG(ssize_t *) = (ssize_t)ret; 794 else if (flags & PTRDIFFT) 795 *GETARG(ptrdiff_t *) = ret; 796 else if (flags & INTMAXT) 797 *GETARG(intmax_t *) = ret; 798 else if (flags & LONGINT) 799 *GETARG(long *) = ret; 800 else if (flags & SHORTINT) 801 *GETARG(short *) = ret; 802 else if (flags & CHARINT) 803 *GETARG(signed char *) = ret; 804 else 805 *GETARG(int *) = ret; 806 continue; /* no output */ 807 case 'O': 808 flags |= LONGINT; 809 /*FALLTHROUGH*/ 810 case 'o': 811 if (flags & INTMAX_SIZE) 812 ujval = UJARG(); 813 else 814 ulval = UARG(); 815 base = 8; 816 goto nosign; 817 case 'p': 818 /*- 819 * ``The argument shall be a pointer to void. The 820 * value of the pointer is converted to a sequence 821 * of printable characters, in an implementation- 822 * defined manner.'' 823 * -- ANSI X3J11 824 */ 825 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 826 base = 16; 827 xdigs = xdigs_lower; 828 flags = flags | INTMAXT; 829 ox[1] = 'x'; 830 goto nosign; 831 case 'S': 832 flags |= LONGINT; 833 /*FALLTHROUGH*/ 834 case 's': 835 if (flags & LONGINT) { 836 wchar_t *wcp; 837 838 if (convbuf != NULL) 839 free(convbuf); 840 if ((wcp = GETARG(wchar_t *)) == NULL) 841 cp = "(null)"; 842 else { 843 convbuf = __wcsconv(wcp, prec); 844 if (convbuf == NULL) { 845 fp->_flags |= __SERR; 846 goto error; 847 } 848 cp = convbuf; 849 } 850 } else if ((cp = GETARG(char *)) == NULL) 851 cp = "(null)"; 852 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 853 sign = '\0'; 854 break; 855 case 'U': 856 flags |= LONGINT; 857 /*FALLTHROUGH*/ 858 case 'u': 859 if (flags & INTMAX_SIZE) 860 ujval = UJARG(); 861 else 862 ulval = UARG(); 863 base = 10; 864 goto nosign; 865 case 'X': 866 xdigs = xdigs_upper; 867 goto hex; 868 case 'x': 869 xdigs = xdigs_lower; 870 hex: 871 if (flags & INTMAX_SIZE) 872 ujval = UJARG(); 873 else 874 ulval = UARG(); 875 base = 16; 876 /* leading 0x/X only if non-zero */ 877 if (flags & ALT && 878 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 879 ox[1] = ch; 880 881 flags &= ~GROUPING; 882 /* unsigned conversions */ 883 nosign: sign = '\0'; 884 /*- 885 * ``... diouXx conversions ... if a precision is 886 * specified, the 0 flag will be ignored.'' 887 * -- ANSI X3J11 888 */ 889 number: if ((dprec = prec) >= 0) 890 flags &= ~ZEROPAD; 891 892 /*- 893 * ``The result of converting a zero value with an 894 * explicit precision of zero is no characters.'' 895 * -- ANSI X3J11 896 * 897 * ``The C Standard is clear enough as is. The call 898 * printf("%#.0o", 0) should print 0.'' 899 * -- Defect Report #151 900 */ 901 cp = buf + BUF; 902 if (flags & INTMAX_SIZE) { 903 if (ujval != 0 || prec != 0 || 904 (flags & ALT && base == 8)) 905 cp = __ujtoa(ujval, cp, base, 906 flags & ALT, xdigs); 907 } else { 908 if (ulval != 0 || prec != 0 || 909 (flags & ALT && base == 8)) 910 cp = __ultoa(ulval, cp, base, 911 flags & ALT, xdigs); 912 } 913 size = buf + BUF - cp; 914 if (size > BUF) /* should never happen */ 915 abort(); 916 if ((flags & GROUPING) && size != 0) 917 size += grouping_init(&gs, size, locale); 918 break; 919 default: /* "%?" prints ?, unless ? is NUL */ 920 if (ch == '\0') 921 goto done; 922 /* pretend it was %c with argument ch */ 923 cp = buf; 924 *cp = ch; 925 size = 1; 926 sign = '\0'; 927 break; 928 } 929 930 /* 931 * All reasonable formats wind up here. At this point, `cp' 932 * points to a string which (if not flags&LADJUST) should be 933 * padded out to `width' places. If flags&ZEROPAD, it should 934 * first be prefixed by any sign or other prefix; otherwise, 935 * it should be blank padded before the prefix is emitted. 936 * After any left-hand padding and prefixing, emit zeroes 937 * required by a decimal [diouxX] precision, then print the 938 * string proper, then emit zeroes required by any leftover 939 * floating precision; finally, if LADJUST, pad with blanks. 940 * 941 * Compute actual size, so we know how much to pad. 942 * size excludes decimal prec; realsz includes it. 943 */ 944 realsz = dprec > size ? dprec : size; 945 if (sign) 946 realsz++; 947 if (ox[1]) 948 realsz += 2; 949 950 prsize = width > realsz ? width : realsz; 951 if ((unsigned)ret + prsize > INT_MAX) { 952 ret = EOF; 953 errno = EOVERFLOW; 954 goto error; 955 } 956 957 /* right-adjusting blank padding */ 958 if ((flags & (LADJUST|ZEROPAD)) == 0) 959 PAD(width - realsz, blanks); 960 961 /* prefix */ 962 if (sign) 963 PRINT(&sign, 1); 964 965 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 966 ox[0] = '0'; 967 PRINT(ox, 2); 968 } 969 970 /* right-adjusting zero padding */ 971 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 972 PAD(width - realsz, zeroes); 973 974 /* the string or number proper */ 975 #ifndef NO_FLOATING_POINT 976 if ((flags & FPT) == 0) { 977 #endif 978 /* leading zeroes from decimal precision */ 979 PAD(dprec - size, zeroes); 980 if (gs.grouping) { 981 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 982 goto error; 983 } else { 984 PRINT(cp, size); 985 } 986 #ifndef NO_FLOATING_POINT 987 } else { /* glue together f_p fragments */ 988 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 989 if (expt <= 0) { 990 PRINT(zeroes, 1); 991 if (prec || flags & ALT) 992 PRINT(decimal_point,decpt_len); 993 PAD(-expt, zeroes); 994 /* already handled initial 0's */ 995 prec += expt; 996 } else { 997 if (gs.grouping) { 998 n = grouping_print(&gs, &io, 999 cp, dtoaend, locale); 1000 if (n < 0) 1001 goto error; 1002 cp += n; 1003 } else { 1004 PRINTANDPAD(cp, dtoaend, 1005 expt, zeroes); 1006 cp += expt; 1007 } 1008 if (prec || flags & ALT) 1009 PRINT(decimal_point,decpt_len); 1010 } 1011 PRINTANDPAD(cp, dtoaend, prec, zeroes); 1012 } else { /* %[eE] or sufficiently long %[gG] */ 1013 if (prec > 1 || flags & ALT) { 1014 PRINT(cp++, 1); 1015 PRINT(decimal_point, decpt_len); 1016 PRINT(cp, ndig-1); 1017 PAD(prec - ndig, zeroes); 1018 } else /* XeYYY */ 1019 PRINT(cp, 1); 1020 PRINT(expstr, expsize); 1021 } 1022 } 1023 #endif 1024 /* left-adjusting padding (always blank) */ 1025 if (flags & LADJUST) 1026 PAD(width - realsz, blanks); 1027 1028 /* finally, adjust ret */ 1029 ret += prsize; 1030 1031 FLUSH(); /* copy out the I/O vectors */ 1032 } 1033 done: 1034 FLUSH(); 1035 error: 1036 va_end(orgap); 1037 #ifndef NO_FLOATING_POINT 1038 if (dtoaresult != NULL) 1039 freedtoa(dtoaresult); 1040 #endif 1041 if (convbuf != NULL) 1042 free(convbuf); 1043 if (__sferror(fp)) 1044 ret = EOF; 1045 else 1046 fp->_flags |= savserr; 1047 if ((argtable != NULL) && (argtable != statargtable)) 1048 free (argtable); 1049 return (ret); 1050 /* NOTREACHED */ 1051 } 1052 1053