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 * All rights reserved. 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 __FBSDID("$FreeBSD$"); 45 46 /* 47 * Actual printf innards. 48 * 49 * This code is large and complicated... 50 */ 51 52 #include "namespace.h" 53 #include <sys/types.h> 54 55 #include <ctype.h> 56 #include <errno.h> 57 #include <limits.h> 58 #include <locale.h> 59 #include <stddef.h> 60 #include <stdint.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <wchar.h> 65 #include <printf.h> 66 67 #include <stdarg.h> 68 #include "xlocale_private.h" 69 #include "un-namespace.h" 70 71 #include "libc_private.h" 72 #include "local.h" 73 #include "fvwrite.h" 74 #include "printflocal.h" 75 76 static int __sprint(FILE *, struct __suio *, locale_t); 77 static int __sbprintf(FILE *, locale_t, const char *, va_list) __printflike(3, 0) 78 __noinline; 79 static char *__wcsconv(wchar_t *, int); 80 81 #define CHAR char 82 #include "printfcommon.h" 83 84 struct grouping_state { 85 char *thousands_sep; /* locale-specific thousands separator */ 86 int thousep_len; /* length of thousands_sep */ 87 const char *grouping; /* locale-specific numeric grouping rules */ 88 int lead; /* sig figs before decimal or group sep */ 89 int nseps; /* number of group separators with ' */ 90 int nrepeats; /* number of repeats of the last group */ 91 }; 92 93 /* 94 * Initialize the thousands' grouping state in preparation to print a 95 * number with ndigits digits. This routine returns the total number 96 * of bytes that will be needed. 97 */ 98 static int 99 grouping_init(struct grouping_state *gs, int ndigits, locale_t loc) 100 { 101 struct lconv *locale; 102 103 locale = localeconv_l(loc); 104 gs->grouping = locale->grouping; 105 gs->thousands_sep = locale->thousands_sep; 106 gs->thousep_len = strlen(gs->thousands_sep); 107 108 gs->nseps = gs->nrepeats = 0; 109 gs->lead = ndigits; 110 while (*gs->grouping != CHAR_MAX) { 111 if (gs->lead <= *gs->grouping) 112 break; 113 gs->lead -= *gs->grouping; 114 if (*(gs->grouping+1)) { 115 gs->nseps++; 116 gs->grouping++; 117 } else 118 gs->nrepeats++; 119 } 120 return ((gs->nseps + gs->nrepeats) * gs->thousep_len); 121 } 122 123 /* 124 * Print a number with thousands' separators. 125 */ 126 static int 127 grouping_print(struct grouping_state *gs, struct io_state *iop, 128 const CHAR *cp, const CHAR *ep, locale_t locale) 129 { 130 const CHAR *cp0 = cp; 131 132 if (io_printandpad(iop, cp, ep, gs->lead, zeroes, locale)) 133 return (-1); 134 cp += gs->lead; 135 while (gs->nseps > 0 || gs->nrepeats > 0) { 136 if (gs->nrepeats > 0) 137 gs->nrepeats--; 138 else { 139 gs->grouping--; 140 gs->nseps--; 141 } 142 if (io_print(iop, gs->thousands_sep, gs->thousep_len, locale)) 143 return (-1); 144 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes, locale)) 145 return (-1); 146 cp += *gs->grouping; 147 } 148 if (cp > ep) 149 cp = ep; 150 return (cp - cp0); 151 } 152 153 /* 154 * Flush out all the vectors defined by the given uio, 155 * then reset it so that it can be reused. 156 */ 157 static int 158 __sprint(FILE *fp, struct __suio *uio, locale_t locale) 159 { 160 int err; 161 162 if (uio->uio_resid == 0) { 163 uio->uio_iovcnt = 0; 164 return (0); 165 } 166 err = __sfvwrite(fp, uio); 167 uio->uio_resid = 0; 168 uio->uio_iovcnt = 0; 169 return (err); 170 } 171 172 /* 173 * Helper function for `fprintf to unbuffered unix file': creates a 174 * temporary buffer. We only work on write-only files; this avoids 175 * worries about ungetc buffers and so forth. 176 */ 177 static int 178 __sbprintf(FILE *fp, locale_t locale, const char *fmt, va_list ap) 179 { 180 int ret; 181 FILE fake = FAKE_FILE; 182 unsigned char buf[BUFSIZ]; 183 184 /* XXX This is probably not needed. */ 185 if (prepwrite(fp) != 0) 186 return (EOF); 187 188 /* copy the important variables */ 189 fake._flags = fp->_flags & ~__SNBF; 190 fake._file = fp->_file; 191 fake._cookie = fp->_cookie; 192 fake._write = fp->_write; 193 fake._orientation = fp->_orientation; 194 fake._mbstate = fp->_mbstate; 195 196 /* set up the buffer */ 197 fake._bf._base = fake._p = buf; 198 fake._bf._size = fake._w = sizeof(buf); 199 fake._lbfsize = 0; /* not actually used, but Just In Case */ 200 201 /* do the work, then copy any error status */ 202 ret = __vfprintf(&fake, locale, fmt, ap); 203 if (ret >= 0 && __fflush(&fake)) 204 ret = EOF; 205 if (fake._flags & __SERR) 206 fp->_flags |= __SERR; 207 return (ret); 208 } 209 210 /* 211 * Convert a wide character string argument for the %ls format to a multibyte 212 * string representation. If not -1, prec specifies the maximum number of 213 * bytes to output, and also means that we can't assume that the wide char. 214 * string ends is null-terminated. 215 */ 216 static char * 217 __wcsconv(wchar_t *wcsarg, int prec) 218 { 219 static const mbstate_t initial; 220 mbstate_t mbs; 221 char buf[MB_LEN_MAX]; 222 wchar_t *p; 223 char *convbuf; 224 size_t clen, nbytes; 225 226 /* Allocate space for the maximum number of bytes we could output. */ 227 if (prec < 0) { 228 p = wcsarg; 229 mbs = initial; 230 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 231 if (nbytes == (size_t)-1) 232 return (NULL); 233 } else { 234 /* 235 * Optimisation: if the output precision is small enough, 236 * just allocate enough memory for the maximum instead of 237 * scanning the string. 238 */ 239 if (prec < 128) 240 nbytes = prec; 241 else { 242 nbytes = 0; 243 p = wcsarg; 244 mbs = initial; 245 for (;;) { 246 clen = wcrtomb(buf, *p++, &mbs); 247 if (clen == 0 || clen == (size_t)-1 || 248 nbytes + clen > prec) 249 break; 250 nbytes += clen; 251 } 252 } 253 } 254 if ((convbuf = malloc(nbytes + 1)) == NULL) 255 return (NULL); 256 257 /* Fill the output buffer. */ 258 p = wcsarg; 259 mbs = initial; 260 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 261 nbytes, &mbs)) == (size_t)-1) { 262 free(convbuf); 263 return (NULL); 264 } 265 convbuf[nbytes] = '\0'; 266 return (convbuf); 267 } 268 269 /* 270 * MT-safe version 271 */ 272 int 273 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0, 274 va_list ap) 275 { 276 int ret; 277 FIX_LOCALE(locale); 278 279 FLOCKFILE_CANCELSAFE(fp); 280 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 281 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 282 fp->_file >= 0) 283 ret = __sbprintf(fp, locale, fmt0, ap); 284 else 285 ret = __vfprintf(fp, locale, fmt0, ap); 286 FUNLOCKFILE_CANCELSAFE(); 287 return (ret); 288 } 289 int 290 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 291 { 292 return vfprintf_l(fp, __get_locale(), fmt0, ap); 293 } 294 295 /* 296 * The size of the buffer we use as scratch space for integer 297 * conversions, among other things. We need enough space to 298 * write a uintmax_t in octal (plus one byte). 299 */ 300 #if UINTMAX_MAX <= UINT64_MAX 301 #define BUF 32 302 #else 303 #error "BUF must be large enough to format a uintmax_t" 304 #endif 305 306 /* 307 * Non-MT-safe version 308 */ 309 int 310 __vfprintf(FILE *fp, locale_t locale, const char *fmt0, va_list ap) 311 { 312 char *fmt; /* format string */ 313 int ch; /* character from fmt */ 314 int n, n2; /* handy integer (short term usage) */ 315 char *cp; /* handy char pointer (short term usage) */ 316 int flags; /* flags as above */ 317 int ret; /* return value accumulator */ 318 int width; /* width from format (%8d), or 0 */ 319 int prec; /* precision from format; <0 for N/A */ 320 char sign; /* sign prefix (' ', '+', '-', or \0) */ 321 struct grouping_state gs; /* thousands' grouping info */ 322 323 #ifndef NO_FLOATING_POINT 324 /* 325 * We can decompose the printed representation of floating 326 * point numbers into several parts, some of which may be empty: 327 * 328 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 329 * A B ---C--- D E F 330 * 331 * A: 'sign' holds this value if present; '\0' otherwise 332 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 333 * C: cp points to the string MMMNNN. Leading and trailing 334 * zeros are not in the string and must be added. 335 * D: expchar holds this character; '\0' if no exponent, e.g. %f 336 * F: at least two digits for decimal, at least one digit for hex 337 */ 338 char *decimal_point; /* locale specific decimal point */ 339 int decpt_len; /* length of decimal_point */ 340 int signflag; /* true if float is negative */ 341 union { /* floating point arguments %[aAeEfFgG] */ 342 double dbl; 343 long double ldbl; 344 } fparg; 345 int expt; /* integer value of exponent */ 346 char expchar; /* exponent character: [eEpP\0] */ 347 char *dtoaend; /* pointer to end of converted digits */ 348 int expsize; /* character count for expstr */ 349 int ndig; /* actual number of digits returned by dtoa */ 350 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 351 char *dtoaresult; /* buffer allocated by dtoa */ 352 #endif 353 u_long ulval; /* integer arguments %[diouxX] */ 354 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 355 int base; /* base for [diouxX] conversion */ 356 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 357 int realsz; /* field size expanded by dprec, sign, etc */ 358 int size; /* size of converted field or string */ 359 int prsize; /* max size of printed field */ 360 const char *xdigs; /* digits for %[xX] conversion */ 361 struct io_state io; /* I/O buffering state */ 362 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 363 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 364 union arg *argtable; /* args, built due to positional arg */ 365 union arg statargtable [STATIC_ARG_TBL_SIZE]; 366 int nextarg; /* 1-based argument index */ 367 va_list orgap; /* original argument pointer */ 368 char *convbuf; /* wide to multibyte conversion result */ 369 int savserr; 370 371 static const char xdigs_lower[16] = "0123456789abcdef"; 372 static const char xdigs_upper[16] = "0123456789ABCDEF"; 373 374 /* BEWARE, these `goto error' on error. */ 375 #define PRINT(ptr, len) { \ 376 if (io_print(&io, (ptr), (len), locale)) \ 377 goto error; \ 378 } 379 #define PAD(howmany, with) { \ 380 if (io_pad(&io, (howmany), (with), locale)) \ 381 goto error; \ 382 } 383 #define PRINTANDPAD(p, ep, len, with) { \ 384 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 385 goto error; \ 386 } 387 #define FLUSH() { \ 388 if (io_flush(&io, locale)) \ 389 goto error; \ 390 } 391 392 /* 393 * Get the argument indexed by nextarg. If the argument table is 394 * built, use it to get the argument. If its not, get the next 395 * argument (and arguments must be gotten sequentially). 396 */ 397 #define GETARG(type) \ 398 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 399 (nextarg++, va_arg(ap, type))) 400 401 /* 402 * To extend shorts properly, we need both signed and unsigned 403 * argument extraction methods. 404 */ 405 #define SARG() \ 406 (flags&LONGINT ? GETARG(long) : \ 407 flags&SHORTINT ? (long)(short)GETARG(int) : \ 408 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 409 (long)GETARG(int)) 410 #define UARG() \ 411 (flags&LONGINT ? GETARG(u_long) : \ 412 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 413 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 414 (u_long)GETARG(u_int)) 415 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 416 #define SJARG() \ 417 (flags&INTMAXT ? GETARG(intmax_t) : \ 418 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 419 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 420 (intmax_t)GETARG(long long)) 421 #define UJARG() \ 422 (flags&INTMAXT ? GETARG(uintmax_t) : \ 423 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 424 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 425 (uintmax_t)GETARG(unsigned long long)) 426 427 /* 428 * Get * arguments, including the form *nn$. Preserve the nextarg 429 * that the argument can be gotten once the type is determined. 430 */ 431 #define GETASTER(val) \ 432 n2 = 0; \ 433 cp = fmt; \ 434 while (is_digit(*cp)) { \ 435 n2 = 10 * n2 + to_digit(*cp); \ 436 cp++; \ 437 } \ 438 if (*cp == '$') { \ 439 int hold = nextarg; \ 440 if (argtable == NULL) { \ 441 argtable = statargtable; \ 442 if (__find_arguments (fmt0, orgap, &argtable)) { \ 443 ret = EOF; \ 444 goto error; \ 445 } \ 446 } \ 447 nextarg = n2; \ 448 val = GETARG (int); \ 449 nextarg = hold; \ 450 fmt = ++cp; \ 451 } else { \ 452 val = GETARG (int); \ 453 } 454 455 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 456 __use_xprintf = 1; 457 if (__use_xprintf > 0) 458 return (__xvprintf(fp, fmt0, ap)); 459 460 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 461 if (prepwrite(fp) != 0) { 462 errno = EBADF; 463 return (EOF); 464 } 465 466 savserr = fp->_flags & __SERR; 467 fp->_flags &= ~__SERR; 468 469 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 'n': 780 /* 781 * Assignment-like behavior is specified if the 782 * value overflows or is otherwise unrepresentable. 783 * C99 says to use `signed char' for %hhn conversions. 784 */ 785 if (flags & LLONGINT) 786 *GETARG(long long *) = ret; 787 else if (flags & SIZET) 788 *GETARG(ssize_t *) = (ssize_t)ret; 789 else if (flags & PTRDIFFT) 790 *GETARG(ptrdiff_t *) = ret; 791 else if (flags & INTMAXT) 792 *GETARG(intmax_t *) = ret; 793 else if (flags & LONGINT) 794 *GETARG(long *) = ret; 795 else if (flags & SHORTINT) 796 *GETARG(short *) = ret; 797 else if (flags & CHARINT) 798 *GETARG(signed char *) = ret; 799 else 800 *GETARG(int *) = ret; 801 continue; /* no output */ 802 case 'O': 803 flags |= LONGINT; 804 /*FALLTHROUGH*/ 805 case 'o': 806 if (flags & INTMAX_SIZE) 807 ujval = UJARG(); 808 else 809 ulval = UARG(); 810 base = 8; 811 goto nosign; 812 case 'p': 813 /*- 814 * ``The argument shall be a pointer to void. The 815 * value of the pointer is converted to a sequence 816 * of printable characters, in an implementation- 817 * defined manner.'' 818 * -- ANSI X3J11 819 */ 820 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 821 base = 16; 822 xdigs = xdigs_lower; 823 flags = flags | INTMAXT; 824 ox[1] = 'x'; 825 goto nosign; 826 case 'S': 827 flags |= LONGINT; 828 /*FALLTHROUGH*/ 829 case 's': 830 if (flags & LONGINT) { 831 wchar_t *wcp; 832 833 if (convbuf != NULL) 834 free(convbuf); 835 if ((wcp = GETARG(wchar_t *)) == NULL) 836 cp = "(null)"; 837 else { 838 convbuf = __wcsconv(wcp, prec); 839 if (convbuf == NULL) { 840 fp->_flags |= __SERR; 841 goto error; 842 } 843 cp = convbuf; 844 } 845 } else if ((cp = GETARG(char *)) == NULL) 846 cp = "(null)"; 847 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 848 sign = '\0'; 849 break; 850 case 'U': 851 flags |= LONGINT; 852 /*FALLTHROUGH*/ 853 case 'u': 854 if (flags & INTMAX_SIZE) 855 ujval = UJARG(); 856 else 857 ulval = UARG(); 858 base = 10; 859 goto nosign; 860 case 'X': 861 xdigs = xdigs_upper; 862 goto hex; 863 case 'x': 864 xdigs = xdigs_lower; 865 hex: 866 if (flags & INTMAX_SIZE) 867 ujval = UJARG(); 868 else 869 ulval = UARG(); 870 base = 16; 871 /* leading 0x/X only if non-zero */ 872 if (flags & ALT && 873 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 874 ox[1] = ch; 875 876 flags &= ~GROUPING; 877 /* unsigned conversions */ 878 nosign: sign = '\0'; 879 /*- 880 * ``... diouXx conversions ... if a precision is 881 * specified, the 0 flag will be ignored.'' 882 * -- ANSI X3J11 883 */ 884 number: if ((dprec = prec) >= 0) 885 flags &= ~ZEROPAD; 886 887 /*- 888 * ``The result of converting a zero value with an 889 * explicit precision of zero is no characters.'' 890 * -- ANSI X3J11 891 * 892 * ``The C Standard is clear enough as is. The call 893 * printf("%#.0o", 0) should print 0.'' 894 * -- Defect Report #151 895 */ 896 cp = buf + BUF; 897 if (flags & INTMAX_SIZE) { 898 if (ujval != 0 || prec != 0 || 899 (flags & ALT && base == 8)) 900 cp = __ujtoa(ujval, cp, base, 901 flags & ALT, xdigs); 902 } else { 903 if (ulval != 0 || prec != 0 || 904 (flags & ALT && base == 8)) 905 cp = __ultoa(ulval, cp, base, 906 flags & ALT, xdigs); 907 } 908 size = buf + BUF - cp; 909 if (size > BUF) /* should never happen */ 910 abort(); 911 if ((flags & GROUPING) && size != 0) 912 size += grouping_init(&gs, size, locale); 913 break; 914 default: /* "%?" prints ?, unless ? is NUL */ 915 if (ch == '\0') 916 goto done; 917 /* pretend it was %c with argument ch */ 918 cp = buf; 919 *cp = ch; 920 size = 1; 921 sign = '\0'; 922 break; 923 } 924 925 /* 926 * All reasonable formats wind up here. At this point, `cp' 927 * points to a string which (if not flags&LADJUST) should be 928 * padded out to `width' places. If flags&ZEROPAD, it should 929 * first be prefixed by any sign or other prefix; otherwise, 930 * it should be blank padded before the prefix is emitted. 931 * After any left-hand padding and prefixing, emit zeroes 932 * required by a decimal [diouxX] precision, then print the 933 * string proper, then emit zeroes required by any leftover 934 * floating precision; finally, if LADJUST, pad with blanks. 935 * 936 * Compute actual size, so we know how much to pad. 937 * size excludes decimal prec; realsz includes it. 938 */ 939 realsz = dprec > size ? dprec : size; 940 if (sign) 941 realsz++; 942 if (ox[1]) 943 realsz += 2; 944 945 prsize = width > realsz ? width : realsz; 946 if ((unsigned)ret + prsize > INT_MAX) { 947 ret = EOF; 948 errno = EOVERFLOW; 949 goto error; 950 } 951 952 /* right-adjusting blank padding */ 953 if ((flags & (LADJUST|ZEROPAD)) == 0) 954 PAD(width - realsz, blanks); 955 956 /* prefix */ 957 if (sign) 958 PRINT(&sign, 1); 959 960 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 961 ox[0] = '0'; 962 PRINT(ox, 2); 963 } 964 965 /* right-adjusting zero padding */ 966 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 967 PAD(width - realsz, zeroes); 968 969 /* the string or number proper */ 970 #ifndef NO_FLOATING_POINT 971 if ((flags & FPT) == 0) { 972 #endif 973 /* leading zeroes from decimal precision */ 974 PAD(dprec - size, zeroes); 975 if (gs.grouping) { 976 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 977 goto error; 978 } else { 979 PRINT(cp, size); 980 } 981 #ifndef NO_FLOATING_POINT 982 } else { /* glue together f_p fragments */ 983 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 984 if (expt <= 0) { 985 PRINT(zeroes, 1); 986 if (prec || flags & ALT) 987 PRINT(decimal_point,decpt_len); 988 PAD(-expt, zeroes); 989 /* already handled initial 0's */ 990 prec += expt; 991 } else { 992 if (gs.grouping) { 993 n = grouping_print(&gs, &io, 994 cp, dtoaend, locale); 995 if (n < 0) 996 goto error; 997 cp += n; 998 } else { 999 PRINTANDPAD(cp, dtoaend, 1000 expt, zeroes); 1001 cp += expt; 1002 } 1003 if (prec || flags & ALT) 1004 PRINT(decimal_point,decpt_len); 1005 } 1006 PRINTANDPAD(cp, dtoaend, prec, zeroes); 1007 } else { /* %[eE] or sufficiently long %[gG] */ 1008 if (prec > 1 || flags & ALT) { 1009 PRINT(cp++, 1); 1010 PRINT(decimal_point, decpt_len); 1011 PRINT(cp, ndig-1); 1012 PAD(prec - ndig, zeroes); 1013 } else /* XeYYY */ 1014 PRINT(cp, 1); 1015 PRINT(expstr, expsize); 1016 } 1017 } 1018 #endif 1019 /* left-adjusting padding (always blank) */ 1020 if (flags & LADJUST) 1021 PAD(width - realsz, blanks); 1022 1023 /* finally, adjust ret */ 1024 ret += prsize; 1025 1026 FLUSH(); /* copy out the I/O vectors */ 1027 } 1028 done: 1029 FLUSH(); 1030 error: 1031 va_end(orgap); 1032 #ifndef NO_FLOATING_POINT 1033 if (dtoaresult != NULL) 1034 freedtoa(dtoaresult); 1035 #endif 1036 if (convbuf != NULL) 1037 free(convbuf); 1038 if (__sferror(fp)) 1039 ret = EOF; 1040 else 1041 fp->_flags |= savserr; 1042 if ((argtable != NULL) && (argtable != statargtable)) 1043 free (argtable); 1044 return (ret); 1045 /* NOTREACHED */ 1046 } 1047 1048