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 /* 41 * Actual printf innards. 42 * 43 * This code is large and complicated... 44 */ 45 46 #include "namespace.h" 47 #include <sys/types.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <locale.h> 53 #include <stddef.h> 54 #include <stdint.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <wchar.h> 59 #include <printf.h> 60 61 #include <stdarg.h> 62 #include "xlocale_private.h" 63 #include "un-namespace.h" 64 65 #include "libc_private.h" 66 #include "local.h" 67 #include "fvwrite.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._flags = fp->_flags & ~__SNBF; 184 fake._file = fp->_file; 185 fake._cookie = fp->_cookie; 186 fake._write = fp->_write; 187 fake._orientation = fp->_orientation; 188 fake._mbstate = fp->_mbstate; 189 190 /* set up the buffer */ 191 fake._bf._base = fake._p = buf; 192 fake._bf._size = fake._w = sizeof(buf); 193 fake._lbfsize = 0; /* not actually used, but Just In Case */ 194 195 /* do the work, then copy any error status */ 196 ret = __vfprintf(&fake, locale, fmt, ap); 197 if (ret >= 0 && __fflush(&fake)) 198 ret = EOF; 199 if (fake._flags & __SERR) 200 fp->_flags |= __SERR; 201 return (ret); 202 } 203 204 /* 205 * Convert a wide character string argument for the %ls format to a multibyte 206 * string representation. If not -1, prec specifies the maximum number of 207 * bytes to output, and also means that we can't assume that the wide char. 208 * string ends is null-terminated. 209 */ 210 static char * 211 __wcsconv(wchar_t *wcsarg, int prec) 212 { 213 static const mbstate_t initial; 214 mbstate_t mbs; 215 char buf[MB_LEN_MAX]; 216 wchar_t *p; 217 char *convbuf; 218 size_t clen, nbytes; 219 220 /* Allocate space for the maximum number of bytes we could output. */ 221 if (prec < 0) { 222 p = wcsarg; 223 mbs = initial; 224 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 225 if (nbytes == (size_t)-1) 226 return (NULL); 227 } else { 228 /* 229 * Optimisation: if the output precision is small enough, 230 * just allocate enough memory for the maximum instead of 231 * scanning the string. 232 */ 233 if (prec < 128) 234 nbytes = prec; 235 else { 236 nbytes = 0; 237 p = wcsarg; 238 mbs = initial; 239 for (;;) { 240 clen = wcrtomb(buf, *p++, &mbs); 241 if (clen == 0 || clen == (size_t)-1 || 242 nbytes + clen > prec) 243 break; 244 nbytes += clen; 245 } 246 } 247 } 248 if ((convbuf = malloc(nbytes + 1)) == NULL) 249 return (NULL); 250 251 /* Fill the output buffer. */ 252 p = wcsarg; 253 mbs = initial; 254 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 255 nbytes, &mbs)) == (size_t)-1) { 256 free(convbuf); 257 return (NULL); 258 } 259 convbuf[nbytes] = '\0'; 260 return (convbuf); 261 } 262 263 /* 264 * MT-safe version 265 */ 266 int 267 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0, 268 va_list ap) 269 { 270 int ret; 271 FIX_LOCALE(locale); 272 273 FLOCKFILE_CANCELSAFE(fp); 274 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 275 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 276 fp->_file >= 0) 277 ret = __sbprintf(fp, locale, fmt0, ap); 278 else 279 ret = __vfprintf(fp, locale, fmt0, ap); 280 FUNLOCKFILE_CANCELSAFE(); 281 return (ret); 282 } 283 int 284 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 285 { 286 return vfprintf_l(fp, __get_locale(), fmt0, ap); 287 } 288 289 /* 290 * The size of the buffer we use as scratch space for integer 291 * conversions, among other things. We need enough space to 292 * write a uintmax_t in octal (plus one byte). 293 */ 294 #if UINTMAX_MAX <= UINT64_MAX 295 #define BUF 32 296 #else 297 #error "BUF must be large enough to format a uintmax_t" 298 #endif 299 300 /* 301 * Non-MT-safe version 302 */ 303 int 304 __vfprintf(FILE *fp, locale_t locale, const char *fmt0, va_list ap) 305 { 306 char *fmt; /* format string */ 307 int ch; /* character from fmt */ 308 int n, n2; /* handy integer (short term usage) */ 309 char *cp; /* handy char pointer (short term usage) */ 310 int flags; /* flags as above */ 311 int ret; /* return value accumulator */ 312 int width; /* width from format (%8d), or 0 */ 313 int prec; /* precision from format; <0 for N/A */ 314 int saved_errno; 315 char sign; /* sign prefix (' ', '+', '-', or \0) */ 316 struct grouping_state gs; /* thousands' grouping info */ 317 318 #ifndef NO_FLOATING_POINT 319 /* 320 * We can decompose the printed representation of floating 321 * point numbers into several parts, some of which may be empty: 322 * 323 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 324 * A B ---C--- D E F 325 * 326 * A: 'sign' holds this value if present; '\0' otherwise 327 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 328 * C: cp points to the string MMMNNN. Leading and trailing 329 * zeros are not in the string and must be added. 330 * D: expchar holds this character; '\0' if no exponent, e.g. %f 331 * F: at least two digits for decimal, at least one digit for hex 332 */ 333 char *decimal_point; /* locale specific decimal point */ 334 int decpt_len; /* length of decimal_point */ 335 int signflag; /* true if float is negative */ 336 union { /* floating point arguments %[aAeEfFgG] */ 337 double dbl; 338 long double ldbl; 339 } fparg; 340 int expt; /* integer value of exponent */ 341 char expchar; /* exponent character: [eEpP\0] */ 342 char *dtoaend; /* pointer to end of converted digits */ 343 int expsize; /* character count for expstr */ 344 int ndig; /* actual number of digits returned by dtoa */ 345 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 346 char *dtoaresult; /* buffer allocated by dtoa */ 347 #endif 348 u_long ulval; /* integer arguments %[diouxX] */ 349 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 350 int base; /* base for [diouxX] conversion */ 351 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 352 int realsz; /* field size expanded by dprec, sign, etc */ 353 int size; /* size of converted field or string */ 354 int prsize; /* max size of printed field */ 355 const char *xdigs; /* digits for %[xX] conversion */ 356 struct io_state io; /* I/O buffering state */ 357 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 358 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 359 union arg *argtable; /* args, built due to positional arg */ 360 union arg statargtable [STATIC_ARG_TBL_SIZE]; 361 int nextarg; /* 1-based argument index */ 362 va_list orgap; /* original argument pointer */ 363 char *convbuf; /* wide to multibyte conversion result */ 364 int savserr; 365 366 static const char xdigs_lower[16] = "0123456789abcdef"; 367 static const char xdigs_upper[16] = "0123456789ABCDEF"; 368 369 /* BEWARE, these `goto error' on error. */ 370 #define PRINT(ptr, len) { \ 371 if (io_print(&io, (ptr), (len), locale)) \ 372 goto error; \ 373 } 374 #define PAD(howmany, with) { \ 375 if (io_pad(&io, (howmany), (with), locale)) \ 376 goto error; \ 377 } 378 #define PRINTANDPAD(p, ep, len, with) { \ 379 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 380 goto error; \ 381 } 382 #define FLUSH() { \ 383 if (io_flush(&io, locale)) \ 384 goto error; \ 385 } 386 387 /* 388 * Get the argument indexed by nextarg. If the argument table is 389 * built, use it to get the argument. If its not, get the next 390 * argument (and arguments must be gotten sequentially). 391 */ 392 #define GETARG(type) \ 393 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 394 (nextarg++, va_arg(ap, type))) 395 396 /* 397 * To extend shorts properly, we need both signed and unsigned 398 * argument extraction methods. 399 */ 400 #define SARG() \ 401 (flags&LONGINT ? GETARG(long) : \ 402 flags&SHORTINT ? (long)(short)GETARG(int) : \ 403 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 404 (long)GETARG(int)) 405 #define UARG() \ 406 (flags&LONGINT ? GETARG(u_long) : \ 407 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 408 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 409 (u_long)GETARG(u_int)) 410 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 411 #define SJARG() \ 412 (flags&INTMAXT ? GETARG(intmax_t) : \ 413 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 414 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 415 (intmax_t)GETARG(long long)) 416 #define UJARG() \ 417 (flags&INTMAXT ? GETARG(uintmax_t) : \ 418 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 419 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 420 (uintmax_t)GETARG(unsigned long long)) 421 422 /* 423 * Get * arguments, including the form *nn$. Preserve the nextarg 424 * that the argument can be gotten once the type is determined. 425 */ 426 #define GETASTER(val) \ 427 n2 = 0; \ 428 cp = fmt; \ 429 while (is_digit(*cp)) { \ 430 n2 = 10 * n2 + to_digit(*cp); \ 431 cp++; \ 432 } \ 433 if (*cp == '$') { \ 434 int hold = nextarg; \ 435 if (argtable == NULL) { \ 436 argtable = statargtable; \ 437 if (__find_arguments (fmt0, orgap, &argtable)) { \ 438 ret = EOF; \ 439 goto error; \ 440 } \ 441 } \ 442 nextarg = n2; \ 443 val = GETARG (int); \ 444 nextarg = hold; \ 445 fmt = ++cp; \ 446 } else { \ 447 val = GETARG (int); \ 448 } 449 450 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 451 __use_xprintf = 1; 452 if (__use_xprintf > 0) 453 return (__xvprintf(fp, fmt0, ap)); 454 455 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 456 if (prepwrite(fp) != 0) { 457 errno = EBADF; 458 return (EOF); 459 } 460 461 savserr = fp->_flags & __SERR; 462 fp->_flags &= ~__SERR; 463 464 saved_errno = errno; 465 convbuf = NULL; 466 fmt = (char *)fmt0; 467 argtable = NULL; 468 nextarg = 1; 469 va_copy(orgap, ap); 470 io_init(&io, fp); 471 ret = 0; 472 #ifndef NO_FLOATING_POINT 473 dtoaresult = NULL; 474 decimal_point = localeconv_l(locale)->decimal_point; 475 /* The overwhelmingly common case is decpt_len == 1. */ 476 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 477 #endif 478 479 /* 480 * Scan the format for conversions (`%' character). 481 */ 482 for (;;) { 483 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 484 /* void */; 485 if ((n = fmt - cp) != 0) { 486 if ((unsigned)ret + n > INT_MAX) { 487 ret = EOF; 488 errno = EOVERFLOW; 489 goto error; 490 } 491 PRINT(cp, n); 492 ret += n; 493 } 494 if (ch == '\0') 495 goto done; 496 fmt++; /* skip over '%' */ 497 498 flags = 0; 499 dprec = 0; 500 width = 0; 501 prec = -1; 502 gs.grouping = NULL; 503 sign = '\0'; 504 ox[1] = '\0'; 505 506 rflag: ch = *fmt++; 507 reswitch: switch (ch) { 508 case ' ': 509 /*- 510 * ``If the space and + flags both appear, the space 511 * flag will be ignored.'' 512 * -- ANSI X3J11 513 */ 514 if (!sign) 515 sign = ' '; 516 goto rflag; 517 case '#': 518 flags |= ALT; 519 goto rflag; 520 case '*': 521 /*- 522 * ``A negative field width argument is taken as a 523 * - flag followed by a positive field width.'' 524 * -- ANSI X3J11 525 * They don't exclude field widths read from args. 526 */ 527 GETASTER (width); 528 if (width >= 0) 529 goto rflag; 530 width = -width; 531 /* FALLTHROUGH */ 532 case '-': 533 flags |= LADJUST; 534 goto rflag; 535 case '+': 536 sign = '+'; 537 goto rflag; 538 case '\'': 539 flags |= GROUPING; 540 goto rflag; 541 case '.': 542 if ((ch = *fmt++) == '*') { 543 GETASTER (prec); 544 goto rflag; 545 } 546 prec = 0; 547 while (is_digit(ch)) { 548 prec = 10 * prec + to_digit(ch); 549 ch = *fmt++; 550 } 551 goto reswitch; 552 case '0': 553 /*- 554 * ``Note that 0 is taken as a flag, not as the 555 * beginning of a field width.'' 556 * -- ANSI X3J11 557 */ 558 flags |= ZEROPAD; 559 goto rflag; 560 case '1': case '2': case '3': case '4': 561 case '5': case '6': case '7': case '8': case '9': 562 n = 0; 563 do { 564 n = 10 * n + to_digit(ch); 565 ch = *fmt++; 566 } while (is_digit(ch)); 567 if (ch == '$') { 568 nextarg = n; 569 if (argtable == NULL) { 570 argtable = statargtable; 571 if (__find_arguments (fmt0, orgap, 572 &argtable)) { 573 ret = EOF; 574 goto error; 575 } 576 } 577 goto rflag; 578 } 579 width = n; 580 goto reswitch; 581 #ifndef NO_FLOATING_POINT 582 case 'L': 583 flags |= LONGDBL; 584 goto rflag; 585 #endif 586 case 'h': 587 if (flags & SHORTINT) { 588 flags &= ~SHORTINT; 589 flags |= CHARINT; 590 } else 591 flags |= SHORTINT; 592 goto rflag; 593 case 'j': 594 flags |= INTMAXT; 595 goto rflag; 596 case 'l': 597 if (flags & LONGINT) { 598 flags &= ~LONGINT; 599 flags |= LLONGINT; 600 } else 601 flags |= LONGINT; 602 goto rflag; 603 case 'q': 604 flags |= LLONGINT; /* not necessarily */ 605 goto rflag; 606 case 't': 607 flags |= PTRDIFFT; 608 goto rflag; 609 case 'w': 610 /* 611 * Fixed-width integer types. On all platforms we 612 * support, int8_t is equivalent to char, int16_t 613 * is equivalent to short, int32_t is equivalent 614 * to int, int64_t is equivalent to long long int. 615 * Furthermore, int_fast8_t, int_fast16_t and 616 * int_fast32_t are equivalent to int, and 617 * int_fast64_t is equivalent to long long int. 618 */ 619 flags &= ~(CHARINT|SHORTINT|LONGINT|LLONGINT|INTMAXT); 620 if (fmt[0] == 'f') { 621 flags |= FASTINT; 622 fmt++; 623 } else { 624 flags &= ~FASTINT; 625 } 626 if (fmt[0] == '8') { 627 if (!(flags & FASTINT)) 628 flags |= CHARINT; 629 else 630 /* no flag set = 32 */ ; 631 fmt += 1; 632 } else if (fmt[0] == '1' && fmt[1] == '6') { 633 if (!(flags & FASTINT)) 634 flags |= SHORTINT; 635 else 636 /* no flag set = 32 */ ; 637 fmt += 2; 638 } else if (fmt[0] == '3' && fmt[1] == '2') { 639 /* no flag set = 32 */ ; 640 fmt += 2; 641 } else if (fmt[0] == '6' && fmt[1] == '4') { 642 flags |= LLONGINT; 643 fmt += 2; 644 } else { 645 if (flags & FASTINT) { 646 flags &= ~FASTINT; 647 fmt--; 648 } 649 goto invalid; 650 } 651 goto rflag; 652 case 'z': 653 flags |= SIZET; 654 goto rflag; 655 case 'B': 656 case 'b': 657 if (flags & INTMAX_SIZE) 658 ujval = UJARG(); 659 else 660 ulval = UARG(); 661 base = 2; 662 /* leading 0b/B only if non-zero */ 663 if (flags & ALT && 664 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 665 ox[1] = ch; 666 goto nosign; 667 break; 668 case 'C': 669 flags |= LONGINT; 670 /*FALLTHROUGH*/ 671 case 'c': 672 if (flags & LONGINT) { 673 static const mbstate_t initial; 674 mbstate_t mbs; 675 size_t mbseqlen; 676 677 mbs = initial; 678 mbseqlen = wcrtomb(cp = buf, 679 (wchar_t)GETARG(wint_t), &mbs); 680 if (mbseqlen == (size_t)-1) { 681 fp->_flags |= __SERR; 682 goto error; 683 } 684 size = (int)mbseqlen; 685 } else { 686 *(cp = buf) = GETARG(int); 687 size = 1; 688 } 689 sign = '\0'; 690 break; 691 case 'D': 692 flags |= LONGINT; 693 /*FALLTHROUGH*/ 694 case 'd': 695 case 'i': 696 if (flags & INTMAX_SIZE) { 697 ujval = SJARG(); 698 if ((intmax_t)ujval < 0) { 699 ujval = -ujval; 700 sign = '-'; 701 } 702 } else { 703 ulval = SARG(); 704 if ((long)ulval < 0) { 705 ulval = -ulval; 706 sign = '-'; 707 } 708 } 709 base = 10; 710 goto number; 711 #ifndef NO_FLOATING_POINT 712 case 'a': 713 case 'A': 714 if (ch == 'a') { 715 ox[1] = 'x'; 716 xdigs = xdigs_lower; 717 expchar = 'p'; 718 } else { 719 ox[1] = 'X'; 720 xdigs = xdigs_upper; 721 expchar = 'P'; 722 } 723 if (prec >= 0) 724 prec++; 725 if (dtoaresult != NULL) 726 freedtoa(dtoaresult); 727 if (flags & LONGDBL) { 728 fparg.ldbl = GETARG(long double); 729 dtoaresult = cp = 730 __hldtoa(fparg.ldbl, xdigs, prec, 731 &expt, &signflag, &dtoaend); 732 } else { 733 fparg.dbl = GETARG(double); 734 dtoaresult = cp = 735 __hdtoa(fparg.dbl, xdigs, prec, 736 &expt, &signflag, &dtoaend); 737 } 738 if (prec < 0) 739 prec = dtoaend - cp; 740 if (expt == INT_MAX) 741 ox[1] = '\0'; 742 goto fp_common; 743 case 'e': 744 case 'E': 745 expchar = ch; 746 if (prec < 0) /* account for digit before decpt */ 747 prec = DEFPREC + 1; 748 else 749 prec++; 750 goto fp_begin; 751 case 'f': 752 case 'F': 753 expchar = '\0'; 754 goto fp_begin; 755 case 'g': 756 case 'G': 757 expchar = ch - ('g' - 'e'); 758 if (prec == 0) 759 prec = 1; 760 fp_begin: 761 if (prec < 0) 762 prec = DEFPREC; 763 if (dtoaresult != NULL) 764 freedtoa(dtoaresult); 765 if (flags & LONGDBL) { 766 fparg.ldbl = GETARG(long double); 767 dtoaresult = cp = 768 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 769 &expt, &signflag, &dtoaend); 770 } else { 771 fparg.dbl = GETARG(double); 772 dtoaresult = cp = 773 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 774 &expt, &signflag, &dtoaend); 775 if (expt == 9999) 776 expt = INT_MAX; 777 } 778 fp_common: 779 if (signflag) 780 sign = '-'; 781 if (expt == INT_MAX) { /* inf or nan */ 782 if (*cp == 'N') { 783 cp = (ch >= 'a') ? "nan" : "NAN"; 784 sign = '\0'; 785 } else 786 cp = (ch >= 'a') ? "inf" : "INF"; 787 size = 3; 788 flags &= ~ZEROPAD; 789 break; 790 } 791 flags |= FPT; 792 ndig = dtoaend - cp; 793 if (ch == 'g' || ch == 'G') { 794 if (expt > -4 && expt <= prec) { 795 /* Make %[gG] smell like %[fF] */ 796 expchar = '\0'; 797 if (flags & ALT) 798 prec -= expt; 799 else 800 prec = ndig - expt; 801 if (prec < 0) 802 prec = 0; 803 } else { 804 /* 805 * Make %[gG] smell like %[eE], but 806 * trim trailing zeroes if no # flag. 807 */ 808 if (!(flags & ALT)) 809 prec = ndig; 810 } 811 } 812 if (expchar) { 813 expsize = exponent(expstr, expt - 1, expchar); 814 size = expsize + prec; 815 if (prec > 1 || flags & ALT) 816 size += decpt_len; 817 } else { 818 /* space for digits before decimal point */ 819 if (expt > 0) 820 size = expt; 821 else /* "0" */ 822 size = 1; 823 /* space for decimal pt and following digits */ 824 if (prec || flags & ALT) 825 size += prec + decpt_len; 826 if ((flags & GROUPING) && expt > 0) 827 size += grouping_init(&gs, expt, locale); 828 } 829 break; 830 #endif /* !NO_FLOATING_POINT */ 831 case 'm': 832 cp = strerror(saved_errno); 833 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 834 sign = '\0'; 835 break; 836 case 'n': 837 /* 838 * Assignment-like behavior is specified if the 839 * value overflows or is otherwise unrepresentable. 840 * C99 says to use `signed char' for %hhn conversions. 841 */ 842 if (flags & LLONGINT) 843 *GETARG(long long *) = ret; 844 else if (flags & SIZET) 845 *GETARG(ssize_t *) = (ssize_t)ret; 846 else if (flags & PTRDIFFT) 847 *GETARG(ptrdiff_t *) = ret; 848 else if (flags & INTMAXT) 849 *GETARG(intmax_t *) = ret; 850 else if (flags & LONGINT) 851 *GETARG(long *) = ret; 852 else if (flags & SHORTINT) 853 *GETARG(short *) = ret; 854 else if (flags & CHARINT) 855 *GETARG(signed char *) = ret; 856 else 857 *GETARG(int *) = ret; 858 continue; /* no output */ 859 case 'O': 860 flags |= LONGINT; 861 /*FALLTHROUGH*/ 862 case 'o': 863 if (flags & INTMAX_SIZE) 864 ujval = UJARG(); 865 else 866 ulval = UARG(); 867 base = 8; 868 goto nosign; 869 case 'p': 870 /*- 871 * ``The argument shall be a pointer to void. The 872 * value of the pointer is converted to a sequence 873 * of printable characters, in an implementation- 874 * defined manner.'' 875 * -- ANSI X3J11 876 */ 877 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 878 base = 16; 879 xdigs = xdigs_lower; 880 flags = flags | INTMAXT; 881 ox[1] = 'x'; 882 goto nosign; 883 case 'S': 884 flags |= LONGINT; 885 /*FALLTHROUGH*/ 886 case 's': 887 if (flags & LONGINT) { 888 wchar_t *wcp; 889 890 if (convbuf != NULL) 891 free(convbuf); 892 if ((wcp = GETARG(wchar_t *)) == NULL) 893 cp = "(null)"; 894 else { 895 convbuf = __wcsconv(wcp, prec); 896 if (convbuf == NULL) { 897 fp->_flags |= __SERR; 898 goto error; 899 } 900 cp = convbuf; 901 } 902 } else if ((cp = GETARG(char *)) == NULL) 903 cp = "(null)"; 904 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 905 sign = '\0'; 906 break; 907 case 'U': 908 flags |= LONGINT; 909 /*FALLTHROUGH*/ 910 case 'u': 911 if (flags & INTMAX_SIZE) 912 ujval = UJARG(); 913 else 914 ulval = UARG(); 915 base = 10; 916 goto nosign; 917 case 'X': 918 xdigs = xdigs_upper; 919 goto hex; 920 case 'x': 921 xdigs = xdigs_lower; 922 hex: 923 if (flags & INTMAX_SIZE) 924 ujval = UJARG(); 925 else 926 ulval = UARG(); 927 base = 16; 928 /* leading 0x/X only if non-zero */ 929 if (flags & ALT && 930 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 931 ox[1] = ch; 932 933 flags &= ~GROUPING; 934 /* unsigned conversions */ 935 nosign: sign = '\0'; 936 /*- 937 * ``... diouXx conversions ... if a precision is 938 * specified, the 0 flag will be ignored.'' 939 * -- ANSI X3J11 940 */ 941 number: if ((dprec = prec) >= 0) 942 flags &= ~ZEROPAD; 943 944 /*- 945 * ``The result of converting a zero value with an 946 * explicit precision of zero is no characters.'' 947 * -- ANSI X3J11 948 * 949 * ``The C Standard is clear enough as is. The call 950 * printf("%#.0o", 0) should print 0.'' 951 * -- Defect Report #151 952 */ 953 cp = buf + BUF; 954 if (flags & INTMAX_SIZE) { 955 if (ujval != 0 || prec != 0 || 956 (flags & ALT && base == 8)) 957 cp = __ujtoa(ujval, cp, base, 958 flags & ALT, xdigs); 959 } else { 960 if (ulval != 0 || prec != 0 || 961 (flags & ALT && base == 8)) 962 cp = __ultoa(ulval, cp, base, 963 flags & ALT, xdigs); 964 } 965 size = buf + BUF - cp; 966 if (size > BUF) /* should never happen */ 967 abort(); 968 if ((flags & GROUPING) && size != 0) 969 size += grouping_init(&gs, size, locale); 970 break; 971 default: /* "%?" prints ?, unless ? is NUL */ 972 if (ch == '\0') 973 goto done; 974 invalid: 975 /* pretend it was %c with argument ch */ 976 cp = buf; 977 *cp = ch; 978 size = 1; 979 sign = '\0'; 980 break; 981 } 982 983 /* 984 * All reasonable formats wind up here. At this point, `cp' 985 * points to a string which (if not flags&LADJUST) should be 986 * padded out to `width' places. If flags&ZEROPAD, it should 987 * first be prefixed by any sign or other prefix; otherwise, 988 * it should be blank padded before the prefix is emitted. 989 * After any left-hand padding and prefixing, emit zeroes 990 * required by a decimal [diouxX] precision, then print the 991 * string proper, then emit zeroes required by any leftover 992 * floating precision; finally, if LADJUST, pad with blanks. 993 * 994 * Compute actual size, so we know how much to pad. 995 * size excludes decimal prec; realsz includes it. 996 */ 997 realsz = dprec > size ? dprec : size; 998 if (sign) 999 realsz++; 1000 if (ox[1]) 1001 realsz += 2; 1002 1003 prsize = width > realsz ? width : realsz; 1004 if ((unsigned)ret + prsize > INT_MAX) { 1005 ret = EOF; 1006 errno = EOVERFLOW; 1007 goto error; 1008 } 1009 1010 /* right-adjusting blank padding */ 1011 if ((flags & (LADJUST|ZEROPAD)) == 0) 1012 PAD(width - realsz, blanks); 1013 1014 /* prefix */ 1015 if (sign) 1016 PRINT(&sign, 1); 1017 1018 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 1019 ox[0] = '0'; 1020 PRINT(ox, 2); 1021 } 1022 1023 /* right-adjusting zero padding */ 1024 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 1025 PAD(width - realsz, zeroes); 1026 1027 /* the string or number proper */ 1028 #ifndef NO_FLOATING_POINT 1029 if ((flags & FPT) == 0) { 1030 #endif 1031 /* leading zeroes from decimal precision */ 1032 PAD(dprec - size, zeroes); 1033 if (gs.grouping) { 1034 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 1035 goto error; 1036 } else { 1037 PRINT(cp, size); 1038 } 1039 #ifndef NO_FLOATING_POINT 1040 } else { /* glue together f_p fragments */ 1041 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 1042 if (expt <= 0) { 1043 PRINT(zeroes, 1); 1044 if (prec || flags & ALT) 1045 PRINT(decimal_point,decpt_len); 1046 PAD(-expt, zeroes); 1047 /* already handled initial 0's */ 1048 prec += expt; 1049 } else { 1050 if (gs.grouping) { 1051 n = grouping_print(&gs, &io, 1052 cp, dtoaend, locale); 1053 if (n < 0) 1054 goto error; 1055 cp += n; 1056 } else { 1057 PRINTANDPAD(cp, dtoaend, 1058 expt, zeroes); 1059 cp += expt; 1060 } 1061 if (prec || flags & ALT) 1062 PRINT(decimal_point,decpt_len); 1063 } 1064 PRINTANDPAD(cp, dtoaend, prec, zeroes); 1065 } else { /* %[eE] or sufficiently long %[gG] */ 1066 if (prec > 1 || flags & ALT) { 1067 PRINT(cp++, 1); 1068 PRINT(decimal_point, decpt_len); 1069 PRINT(cp, ndig-1); 1070 PAD(prec - ndig, zeroes); 1071 } else /* XeYYY */ 1072 PRINT(cp, 1); 1073 PRINT(expstr, expsize); 1074 } 1075 } 1076 #endif 1077 /* left-adjusting padding (always blank) */ 1078 if (flags & LADJUST) 1079 PAD(width - realsz, blanks); 1080 1081 /* finally, adjust ret */ 1082 ret += prsize; 1083 1084 FLUSH(); /* copy out the I/O vectors */ 1085 } 1086 done: 1087 FLUSH(); 1088 error: 1089 va_end(orgap); 1090 #ifndef NO_FLOATING_POINT 1091 if (dtoaresult != NULL) 1092 freedtoa(dtoaresult); 1093 #endif 1094 if (convbuf != NULL) 1095 free(convbuf); 1096 if (__sferror(fp)) 1097 ret = EOF; 1098 else 1099 fp->_flags |= savserr; 1100 if ((argtable != NULL) && (argtable != statargtable)) 1101 free (argtable); 1102 return (ret); 1103 /* NOTREACHED */ 1104 } 1105 1106