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, int, const char *, va_list) 72 __printflike(4, 0) 73 __noinline; 74 static char *__wcsconv(wchar_t *, int); 75 76 #define CHAR char 77 #include "printfcommon.h" 78 79 struct grouping_state { 80 char *thousands_sep; /* locale-specific thousands separator */ 81 int thousep_len; /* length of thousands_sep */ 82 const char *grouping; /* locale-specific numeric grouping rules */ 83 int lead; /* sig figs before decimal or group sep */ 84 int nseps; /* number of group separators with ' */ 85 int nrepeats; /* number of repeats of the last group */ 86 }; 87 88 /* 89 * Initialize the thousands' grouping state in preparation to print a 90 * number with ndigits digits. This routine returns the total number 91 * of bytes that will be needed. 92 */ 93 static int 94 grouping_init(struct grouping_state *gs, int ndigits, locale_t loc) 95 { 96 struct lconv *locale; 97 98 locale = localeconv_l(loc); 99 gs->grouping = locale->grouping; 100 gs->thousands_sep = locale->thousands_sep; 101 gs->thousep_len = strlen(gs->thousands_sep); 102 103 gs->nseps = gs->nrepeats = 0; 104 gs->lead = ndigits; 105 while (*gs->grouping != CHAR_MAX) { 106 if (gs->lead <= *gs->grouping) 107 break; 108 gs->lead -= *gs->grouping; 109 if (*(gs->grouping+1)) { 110 gs->nseps++; 111 gs->grouping++; 112 } else 113 gs->nrepeats++; 114 } 115 return ((gs->nseps + gs->nrepeats) * gs->thousep_len); 116 } 117 118 /* 119 * Print a number with thousands' separators. 120 */ 121 static int 122 grouping_print(struct grouping_state *gs, struct io_state *iop, 123 const CHAR *cp, const CHAR *ep, locale_t locale) 124 { 125 const CHAR *cp0 = cp; 126 127 if (io_printandpad(iop, cp, ep, gs->lead, zeroes, locale)) 128 return (-1); 129 cp += gs->lead; 130 while (gs->nseps > 0 || gs->nrepeats > 0) { 131 if (gs->nrepeats > 0) 132 gs->nrepeats--; 133 else { 134 gs->grouping--; 135 gs->nseps--; 136 } 137 if (io_print(iop, gs->thousands_sep, gs->thousep_len, locale)) 138 return (-1); 139 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes, locale)) 140 return (-1); 141 cp += *gs->grouping; 142 } 143 if (cp > ep) 144 cp = ep; 145 return (cp - cp0); 146 } 147 148 /* 149 * Flush out all the vectors defined by the given uio, 150 * then reset it so that it can be reused. 151 */ 152 static int 153 __sprint(FILE *fp, struct __suio *uio, locale_t locale) 154 { 155 int err; 156 157 if (uio->uio_resid == 0) { 158 uio->uio_iovcnt = 0; 159 return (0); 160 } 161 err = __sfvwrite(fp, uio); 162 uio->uio_resid = 0; 163 uio->uio_iovcnt = 0; 164 return (err); 165 } 166 167 /* 168 * Helper function for `fprintf to unbuffered unix file': creates a 169 * temporary buffer. We only work on write-only files; this avoids 170 * worries about ungetc buffers and so forth. 171 */ 172 static int 173 __sbprintf(FILE *fp, locale_t locale, int serrno, const char *fmt, va_list ap) 174 { 175 int ret; 176 FILE fake = FAKE_FILE; 177 unsigned char buf[BUFSIZ]; 178 179 /* XXX This is probably not needed. */ 180 if (prepwrite(fp) != 0) 181 return (EOF); 182 183 /* copy the important variables */ 184 fake._flags = fp->_flags & ~__SNBF; 185 fake._file = fp->_file; 186 fake._cookie = fp->_cookie; 187 fake._write = fp->_write; 188 fake._orientation = fp->_orientation; 189 fake._mbstate = fp->_mbstate; 190 191 /* set up the buffer */ 192 fake._bf._base = fake._p = buf; 193 fake._bf._size = fake._w = sizeof(buf); 194 fake._lbfsize = 0; /* not actually used, but Just In Case */ 195 196 /* do the work, then copy any error status */ 197 ret = __vfprintf(&fake, locale, serrno, fmt, ap); 198 if (ret >= 0 && __fflush(&fake)) 199 ret = EOF; 200 if (fake._flags & __SERR) 201 fp->_flags |= __SERR; 202 return (ret); 203 } 204 205 /* 206 * Convert a wide character string argument for the %ls format to a multibyte 207 * string representation. If not -1, prec specifies the maximum number of 208 * bytes to output, and also means that we can't assume that the wide char. 209 * string ends is null-terminated. 210 */ 211 static char * 212 __wcsconv(wchar_t *wcsarg, int prec) 213 { 214 static const mbstate_t initial; 215 mbstate_t mbs; 216 char buf[MB_LEN_MAX]; 217 wchar_t *p; 218 char *convbuf; 219 size_t clen, nbytes; 220 221 /* Allocate space for the maximum number of bytes we could output. */ 222 if (prec < 0) { 223 p = wcsarg; 224 mbs = initial; 225 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 226 if (nbytes == (size_t)-1) 227 return (NULL); 228 } else { 229 /* 230 * Optimisation: if the output precision is small enough, 231 * just allocate enough memory for the maximum instead of 232 * scanning the string. 233 */ 234 if (prec < 128) 235 nbytes = prec; 236 else { 237 nbytes = 0; 238 p = wcsarg; 239 mbs = initial; 240 for (;;) { 241 clen = wcrtomb(buf, *p++, &mbs); 242 if (clen == 0 || clen == (size_t)-1 || 243 nbytes + clen > prec) 244 break; 245 nbytes += clen; 246 } 247 } 248 } 249 if ((convbuf = malloc(nbytes + 1)) == NULL) 250 return (NULL); 251 252 /* Fill the output buffer. */ 253 p = wcsarg; 254 mbs = initial; 255 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 256 nbytes, &mbs)) == (size_t)-1) { 257 free(convbuf); 258 return (NULL); 259 } 260 convbuf[nbytes] = '\0'; 261 return (convbuf); 262 } 263 264 /* 265 * MT-safe version 266 */ 267 int 268 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0, 269 va_list ap) 270 { 271 int serrno = errno; 272 int ret; 273 FIX_LOCALE(locale); 274 275 FLOCKFILE_CANCELSAFE(fp); 276 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 277 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 278 fp->_file >= 0) 279 ret = __sbprintf(fp, locale, serrno, fmt0, ap); 280 else 281 ret = __vfprintf(fp, locale, serrno, fmt0, ap); 282 FUNLOCKFILE_CANCELSAFE(); 283 return (ret); 284 } 285 int 286 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 287 { 288 return vfprintf_l(fp, __get_locale(), fmt0, ap); 289 } 290 291 /* 292 * The size of the buffer we use as scratch space for integer 293 * conversions, among other things. We need enough space to 294 * write a uintmax_t in binary. 295 */ 296 #define BUF (sizeof(uintmax_t) * CHAR_BIT) 297 298 /* 299 * Non-MT-safe version 300 */ 301 int 302 __vfprintf(FILE *fp, locale_t locale, int serrno, 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 int error; 313 char errnomsg[NL_TEXTMAX]; 314 char sign; /* sign prefix (' ', '+', '-', or \0) */ 315 struct grouping_state gs; /* thousands' grouping info */ 316 317 /* 318 * We can decompose the printed representation of floating 319 * point numbers into several parts, some of which may be empty: 320 * 321 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 322 * A B ---C--- D E F 323 * 324 * A: 'sign' holds this value if present; '\0' otherwise 325 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 326 * C: cp points to the string MMMNNN. Leading and trailing 327 * zeros are not in the string and must be added. 328 * D: expchar holds this character; '\0' if no exponent, e.g. %f 329 * F: at least two digits for decimal, at least one digit for hex 330 */ 331 char *decimal_point; /* locale specific decimal point */ 332 int decpt_len; /* length of decimal_point */ 333 int signflag; /* true if float is negative */ 334 union { /* floating point arguments %[aAeEfFgG] */ 335 double dbl; 336 long double ldbl; 337 } fparg; 338 int expt; /* integer value of exponent */ 339 char expchar; /* exponent character: [eEpP\0] */ 340 char *dtoaend; /* pointer to end of converted digits */ 341 int expsize; /* character count for expstr */ 342 int ndig; /* actual number of digits returned by dtoa */ 343 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 344 char *dtoaresult; /* buffer allocated by dtoa */ 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 int savserr; 362 363 static const char xdigs_lower[16] = "0123456789abcdef"; 364 static const char xdigs_upper[16] = "0123456789ABCDEF"; 365 366 /* BEWARE, these `goto error' on error. */ 367 #define PRINT(ptr, len) { \ 368 if (io_print(&io, (ptr), (len), locale)) \ 369 goto error; \ 370 } 371 #define PAD(howmany, with) { \ 372 if (io_pad(&io, (howmany), (with), locale)) \ 373 goto error; \ 374 } 375 #define PRINTANDPAD(p, ep, len, with) { \ 376 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 377 goto error; \ 378 } 379 #define FLUSH() { \ 380 if (io_flush(&io, locale)) \ 381 goto error; \ 382 } 383 384 /* 385 * Get the argument indexed by nextarg. If the argument table is 386 * built, use it to get the argument. If its not, get the next 387 * argument (and arguments must be gotten sequentially). 388 */ 389 #define GETARG(type) \ 390 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 391 (nextarg++, va_arg(ap, type))) 392 393 /* 394 * To extend shorts properly, we need both signed and unsigned 395 * argument extraction methods. 396 */ 397 #define SARG() \ 398 (flags&LONGINT ? GETARG(long) : \ 399 flags&SHORTINT ? (long)(short)GETARG(int) : \ 400 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 401 (long)GETARG(int)) 402 #define UARG() \ 403 (flags&LONGINT ? GETARG(u_long) : \ 404 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 405 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 406 (u_long)GETARG(u_int)) 407 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 408 #define SJARG() \ 409 (flags&INTMAXT ? GETARG(intmax_t) : \ 410 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 411 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 412 (intmax_t)GETARG(long long)) 413 #define UJARG() \ 414 (flags&INTMAXT ? GETARG(uintmax_t) : \ 415 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 416 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 417 (uintmax_t)GETARG(unsigned long long)) 418 419 /* 420 * Get * arguments, including the form *nn$. Preserve the nextarg 421 * that the argument can be gotten once the type is determined. 422 */ 423 #define GETASTER(val) \ 424 n2 = 0; \ 425 cp = fmt; \ 426 while (is_digit(*cp)) { \ 427 n2 = 10 * n2 + to_digit(*cp); \ 428 cp++; \ 429 } \ 430 if (*cp == '$') { \ 431 int hold = nextarg; \ 432 if (argtable == NULL) { \ 433 argtable = statargtable; \ 434 if (__find_arguments (fmt0, orgap, &argtable)) { \ 435 ret = EOF; \ 436 goto error; \ 437 } \ 438 } \ 439 nextarg = n2; \ 440 val = GETARG (int); \ 441 nextarg = hold; \ 442 fmt = ++cp; \ 443 } else { \ 444 val = GETARG (int); \ 445 } 446 447 if (__use_xprintf > 0) 448 return (__xvprintf(fp, fmt0, ap)); 449 450 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 451 if (prepwrite(fp) != 0) { 452 errno = EBADF; 453 return (EOF); 454 } 455 456 savserr = fp->_flags & __SERR; 457 fp->_flags &= ~__SERR; 458 459 convbuf = NULL; 460 fmt = (char *)fmt0; 461 argtable = NULL; 462 nextarg = 1; 463 va_copy(orgap, ap); 464 io_init(&io, fp); 465 ret = 0; 466 dtoaresult = NULL; 467 decimal_point = localeconv_l(locale)->decimal_point; 468 /* The overwhelmingly common case is decpt_len == 1. */ 469 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 470 471 /* 472 * Scan the format for conversions (`%' character). 473 */ 474 for (;;) { 475 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 476 /* void */; 477 if ((n = fmt - cp) != 0) { 478 if ((unsigned)ret + n > INT_MAX) { 479 ret = EOF; 480 errno = EOVERFLOW; 481 goto error; 482 } 483 PRINT(cp, n); 484 ret += n; 485 } 486 if (ch == '\0') 487 goto done; 488 fmt++; /* skip over '%' */ 489 490 flags = 0; 491 dprec = 0; 492 width = 0; 493 prec = -1; 494 gs.grouping = NULL; 495 sign = '\0'; 496 ox[1] = '\0'; 497 498 rflag: ch = *fmt++; 499 reswitch: switch (ch) { 500 case ' ': 501 /*- 502 * ``If the space and + flags both appear, the space 503 * flag will be ignored.'' 504 * -- ANSI X3J11 505 */ 506 if (!sign) 507 sign = ' '; 508 goto rflag; 509 case '#': 510 flags |= ALT; 511 goto rflag; 512 case '*': 513 /*- 514 * ``A negative field width argument is taken as a 515 * - flag followed by a positive field width.'' 516 * -- ANSI X3J11 517 * They don't exclude field widths read from args. 518 */ 519 GETASTER (width); 520 if (width >= 0) 521 goto rflag; 522 width = -width; 523 /* FALLTHROUGH */ 524 case '-': 525 flags |= LADJUST; 526 goto rflag; 527 case '+': 528 sign = '+'; 529 goto rflag; 530 case '\'': 531 flags |= GROUPING; 532 goto rflag; 533 case '.': 534 if ((ch = *fmt++) == '*') { 535 GETASTER (prec); 536 goto rflag; 537 } 538 prec = 0; 539 while (is_digit(ch)) { 540 prec = 10 * prec + to_digit(ch); 541 ch = *fmt++; 542 } 543 goto reswitch; 544 case '0': 545 /*- 546 * ``Note that 0 is taken as a flag, not as the 547 * beginning of a field width.'' 548 * -- ANSI X3J11 549 */ 550 flags |= ZEROPAD; 551 goto rflag; 552 case '1': case '2': case '3': case '4': 553 case '5': case '6': case '7': case '8': case '9': 554 n = 0; 555 do { 556 n = 10 * n + to_digit(ch); 557 ch = *fmt++; 558 } while (is_digit(ch)); 559 if (ch == '$') { 560 nextarg = n; 561 if (argtable == NULL) { 562 argtable = statargtable; 563 if (__find_arguments (fmt0, orgap, 564 &argtable)) { 565 ret = EOF; 566 goto error; 567 } 568 } 569 goto rflag; 570 } 571 width = n; 572 goto reswitch; 573 case 'L': 574 flags |= LONGDBL; 575 goto rflag; 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 'w': 600 /* 601 * Fixed-width integer types. On all platforms we 602 * support, int8_t is equivalent to char, int16_t 603 * is equivalent to short, int32_t is equivalent 604 * to int, int64_t is equivalent to long long int. 605 * Furthermore, int_fast8_t, int_fast16_t and 606 * int_fast32_t are equivalent to int, and 607 * int_fast64_t is equivalent to long long int. 608 */ 609 flags &= ~(CHARINT|SHORTINT|LONGINT|LLONGINT|INTMAXT); 610 if (fmt[0] == 'f') { 611 flags |= FASTINT; 612 fmt++; 613 } else { 614 flags &= ~FASTINT; 615 } 616 if (fmt[0] == '8') { 617 if (!(flags & FASTINT)) 618 flags |= CHARINT; 619 else 620 /* no flag set = 32 */ ; 621 fmt += 1; 622 } else if (fmt[0] == '1' && fmt[1] == '6') { 623 if (!(flags & FASTINT)) 624 flags |= SHORTINT; 625 else 626 /* no flag set = 32 */ ; 627 fmt += 2; 628 } else if (fmt[0] == '3' && fmt[1] == '2') { 629 /* no flag set = 32 */ ; 630 fmt += 2; 631 } else if (fmt[0] == '6' && fmt[1] == '4') { 632 flags |= LLONGINT; 633 fmt += 2; 634 } else { 635 if (flags & FASTINT) { 636 flags &= ~FASTINT; 637 fmt--; 638 } 639 goto invalid; 640 } 641 goto rflag; 642 case 'z': 643 flags |= SIZET; 644 goto rflag; 645 case 'B': 646 case 'b': 647 if (flags & INTMAX_SIZE) 648 ujval = UJARG(); 649 else 650 ulval = UARG(); 651 base = 2; 652 /* leading 0b/B only if non-zero */ 653 if (flags & ALT && 654 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 655 ox[1] = ch; 656 goto nosign; 657 break; 658 case 'C': 659 flags |= LONGINT; 660 /*FALLTHROUGH*/ 661 case 'c': 662 if (flags & LONGINT) { 663 static const mbstate_t initial; 664 mbstate_t mbs; 665 size_t mbseqlen; 666 667 mbs = initial; 668 mbseqlen = wcrtomb(cp = buf, 669 (wchar_t)GETARG(wint_t), &mbs); 670 if (mbseqlen == (size_t)-1) { 671 fp->_flags |= __SERR; 672 goto error; 673 } 674 size = (int)mbseqlen; 675 } else { 676 *(cp = buf) = GETARG(int); 677 size = 1; 678 } 679 sign = '\0'; 680 break; 681 case 'D': 682 flags |= LONGINT; 683 /*FALLTHROUGH*/ 684 case 'd': 685 case 'i': 686 if (flags & INTMAX_SIZE) { 687 ujval = SJARG(); 688 if ((intmax_t)ujval < 0) { 689 ujval = -ujval; 690 sign = '-'; 691 } 692 } else { 693 ulval = SARG(); 694 if ((long)ulval < 0) { 695 ulval = -ulval; 696 sign = '-'; 697 } 698 } 699 base = 10; 700 goto number; 701 case 'a': 702 case 'A': 703 if (ch == 'a') { 704 ox[1] = 'x'; 705 xdigs = xdigs_lower; 706 expchar = 'p'; 707 } else { 708 ox[1] = 'X'; 709 xdigs = xdigs_upper; 710 expchar = 'P'; 711 } 712 if (prec >= 0) 713 prec++; 714 if (dtoaresult != NULL) 715 freedtoa(dtoaresult); 716 if (flags & LONGDBL) { 717 fparg.ldbl = GETARG(long double); 718 dtoaresult = cp = 719 __hldtoa(fparg.ldbl, xdigs, prec, 720 &expt, &signflag, &dtoaend); 721 } else { 722 fparg.dbl = GETARG(double); 723 dtoaresult = cp = 724 __hdtoa(fparg.dbl, xdigs, prec, 725 &expt, &signflag, &dtoaend); 726 } 727 if (prec < 0) 728 prec = dtoaend - cp; 729 if (expt == INT_MAX) 730 ox[1] = '\0'; 731 goto fp_common; 732 case 'e': 733 case 'E': 734 expchar = ch; 735 if (prec < 0) /* account for digit before decpt */ 736 prec = DEFPREC + 1; 737 else 738 prec++; 739 goto fp_begin; 740 case 'f': 741 case 'F': 742 expchar = '\0'; 743 goto fp_begin; 744 case 'g': 745 case 'G': 746 expchar = ch - ('g' - 'e'); 747 if (prec == 0) 748 prec = 1; 749 fp_begin: 750 if (prec < 0) 751 prec = DEFPREC; 752 if (dtoaresult != NULL) 753 freedtoa(dtoaresult); 754 if (flags & LONGDBL) { 755 fparg.ldbl = GETARG(long double); 756 dtoaresult = cp = 757 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 758 &expt, &signflag, &dtoaend); 759 } else { 760 fparg.dbl = GETARG(double); 761 dtoaresult = cp = 762 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 763 &expt, &signflag, &dtoaend); 764 if (expt == 9999) 765 expt = INT_MAX; 766 } 767 fp_common: 768 if (signflag) 769 sign = '-'; 770 if (expt == INT_MAX) { /* inf or nan */ 771 if (*cp == 'N') { 772 cp = (ch >= 'a') ? "nan" : "NAN"; 773 sign = '\0'; 774 } else 775 cp = (ch >= 'a') ? "inf" : "INF"; 776 size = 3; 777 flags &= ~ZEROPAD; 778 break; 779 } 780 flags |= FPT; 781 ndig = dtoaend - cp; 782 if (ch == 'g' || ch == 'G') { 783 if (expt > -4 && expt <= prec) { 784 /* Make %[gG] smell like %[fF] */ 785 expchar = '\0'; 786 if (flags & ALT) 787 prec -= expt; 788 else 789 prec = ndig - expt; 790 if (prec < 0) 791 prec = 0; 792 } else { 793 /* 794 * Make %[gG] smell like %[eE], but 795 * trim trailing zeroes if no # flag. 796 */ 797 if (!(flags & ALT)) 798 prec = ndig; 799 } 800 } 801 if (expchar) { 802 expsize = exponent(expstr, expt - 1, expchar); 803 size = expsize + prec; 804 if (prec > 1 || flags & ALT) 805 size += decpt_len; 806 } else { 807 /* space for digits before decimal point */ 808 if (expt > 0) 809 size = expt; 810 else /* "0" */ 811 size = 1; 812 /* space for decimal pt and following digits */ 813 if (prec || flags & ALT) 814 size += prec + decpt_len; 815 if ((flags & GROUPING) && expt > 0) 816 size += grouping_init(&gs, expt, locale); 817 } 818 break; 819 case 'm': 820 error = __strerror_rl(serrno, errnomsg, 821 sizeof(errnomsg), locale); 822 cp = error == 0 ? errnomsg : "<strerror failure>"; 823 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 824 sign = '\0'; 825 break; 826 case 'n': 827 /* 828 * Assignment-like behavior is specified if the 829 * value overflows or is otherwise unrepresentable. 830 * C99 says to use `signed char' for %hhn conversions. 831 */ 832 if (flags & LLONGINT) 833 *GETARG(long long *) = ret; 834 else if (flags & SIZET) 835 *GETARG(ssize_t *) = (ssize_t)ret; 836 else if (flags & PTRDIFFT) 837 *GETARG(ptrdiff_t *) = ret; 838 else if (flags & INTMAXT) 839 *GETARG(intmax_t *) = ret; 840 else if (flags & LONGINT) 841 *GETARG(long *) = ret; 842 else if (flags & SHORTINT) 843 *GETARG(short *) = ret; 844 else if (flags & CHARINT) 845 *GETARG(signed char *) = ret; 846 else 847 *GETARG(int *) = ret; 848 continue; /* no output */ 849 case 'O': 850 flags |= LONGINT; 851 /*FALLTHROUGH*/ 852 case 'o': 853 if (flags & INTMAX_SIZE) 854 ujval = UJARG(); 855 else 856 ulval = UARG(); 857 base = 8; 858 goto nosign; 859 case 'p': 860 /*- 861 * ``The argument shall be a pointer to void. The 862 * value of the pointer is converted to a sequence 863 * of printable characters, in an implementation- 864 * defined manner.'' 865 * -- ANSI X3J11 866 */ 867 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 868 base = 16; 869 xdigs = xdigs_lower; 870 flags = flags | INTMAXT; 871 ox[1] = 'x'; 872 goto nosign; 873 case 'S': 874 flags |= LONGINT; 875 /*FALLTHROUGH*/ 876 case 's': 877 if (flags & LONGINT) { 878 wchar_t *wcp; 879 880 if (convbuf != NULL) 881 free(convbuf); 882 if ((wcp = GETARG(wchar_t *)) == NULL) 883 cp = "(null)"; 884 else { 885 convbuf = __wcsconv(wcp, prec); 886 if (convbuf == NULL) { 887 fp->_flags |= __SERR; 888 goto error; 889 } 890 cp = convbuf; 891 } 892 } else if ((cp = GETARG(char *)) == NULL) 893 cp = "(null)"; 894 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 895 sign = '\0'; 896 break; 897 case 'U': 898 flags |= LONGINT; 899 /*FALLTHROUGH*/ 900 case 'u': 901 if (flags & INTMAX_SIZE) 902 ujval = UJARG(); 903 else 904 ulval = UARG(); 905 base = 10; 906 goto nosign; 907 case 'X': 908 xdigs = xdigs_upper; 909 goto hex; 910 case 'x': 911 xdigs = xdigs_lower; 912 hex: 913 if (flags & INTMAX_SIZE) 914 ujval = UJARG(); 915 else 916 ulval = UARG(); 917 base = 16; 918 /* leading 0x/X only if non-zero */ 919 if (flags & ALT && 920 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 921 ox[1] = ch; 922 923 flags &= ~GROUPING; 924 /* unsigned conversions */ 925 nosign: sign = '\0'; 926 /*- 927 * ``... diouXx conversions ... if a precision is 928 * specified, the 0 flag will be ignored.'' 929 * -- ANSI X3J11 930 */ 931 number: if ((dprec = prec) >= 0) 932 flags &= ~ZEROPAD; 933 934 /*- 935 * ``The result of converting a zero value with an 936 * explicit precision of zero is no characters.'' 937 * -- ANSI X3J11 938 * 939 * ``The C Standard is clear enough as is. The call 940 * printf("%#.0o", 0) should print 0.'' 941 * -- Defect Report #151 942 */ 943 cp = buf + BUF; 944 if (flags & INTMAX_SIZE) { 945 if (ujval != 0 || prec != 0 || 946 (flags & ALT && base == 8)) 947 cp = __ujtoa(ujval, cp, base, 948 flags & ALT, xdigs); 949 } else { 950 if (ulval != 0 || prec != 0 || 951 (flags & ALT && base == 8)) 952 cp = __ultoa(ulval, cp, base, 953 flags & ALT, xdigs); 954 } 955 size = buf + BUF - cp; 956 if (size > BUF) /* should never happen */ 957 abort(); 958 if ((flags & GROUPING) && size != 0) 959 size += grouping_init(&gs, size, locale); 960 break; 961 default: /* "%?" prints ?, unless ? is NUL */ 962 if (ch == '\0') 963 goto done; 964 invalid: 965 /* pretend it was %c with argument ch */ 966 cp = buf; 967 *cp = ch; 968 size = 1; 969 sign = '\0'; 970 break; 971 } 972 973 /* 974 * All reasonable formats wind up here. At this point, `cp' 975 * points to a string which (if not flags&LADJUST) should be 976 * padded out to `width' places. If flags&ZEROPAD, it should 977 * first be prefixed by any sign or other prefix; otherwise, 978 * it should be blank padded before the prefix is emitted. 979 * After any left-hand padding and prefixing, emit zeroes 980 * required by a decimal [diouxX] precision, then print the 981 * string proper, then emit zeroes required by any leftover 982 * floating precision; finally, if LADJUST, pad with blanks. 983 * 984 * Compute actual size, so we know how much to pad. 985 * size excludes decimal prec; realsz includes it. 986 */ 987 realsz = dprec > size ? dprec : size; 988 if (sign) 989 realsz++; 990 if (ox[1]) 991 realsz += 2; 992 993 prsize = width > realsz ? width : realsz; 994 if ((unsigned)ret + prsize > INT_MAX) { 995 ret = EOF; 996 errno = EOVERFLOW; 997 goto error; 998 } 999 1000 /* right-adjusting blank padding */ 1001 if ((flags & (LADJUST|ZEROPAD)) == 0) 1002 PAD(width - realsz, blanks); 1003 1004 /* prefix */ 1005 if (sign) 1006 PRINT(&sign, 1); 1007 1008 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 1009 ox[0] = '0'; 1010 PRINT(ox, 2); 1011 } 1012 1013 /* right-adjusting zero padding */ 1014 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 1015 PAD(width - realsz, zeroes); 1016 1017 /* the string or number proper */ 1018 if ((flags & FPT) == 0) { 1019 /* leading zeroes from decimal precision */ 1020 PAD(dprec - size, zeroes); 1021 if (gs.grouping) { 1022 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 1023 goto error; 1024 } else { 1025 PRINT(cp, size); 1026 } 1027 } else { /* glue together f_p fragments */ 1028 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 1029 if (expt <= 0) { 1030 PRINT(zeroes, 1); 1031 if (prec || flags & ALT) 1032 PRINT(decimal_point,decpt_len); 1033 PAD(-expt, zeroes); 1034 /* already handled initial 0's */ 1035 prec += expt; 1036 } else { 1037 if (gs.grouping) { 1038 n = grouping_print(&gs, &io, 1039 cp, dtoaend, locale); 1040 if (n < 0) 1041 goto error; 1042 cp += n; 1043 } else { 1044 PRINTANDPAD(cp, dtoaend, 1045 expt, zeroes); 1046 cp += expt; 1047 } 1048 if (prec || flags & ALT) 1049 PRINT(decimal_point,decpt_len); 1050 } 1051 PRINTANDPAD(cp, dtoaend, prec, zeroes); 1052 } else { /* %[eE] or sufficiently long %[gG] */ 1053 if (prec > 1 || flags & ALT) { 1054 PRINT(cp++, 1); 1055 PRINT(decimal_point, decpt_len); 1056 PRINT(cp, ndig-1); 1057 PAD(prec - ndig, zeroes); 1058 } else /* XeYYY */ 1059 PRINT(cp, 1); 1060 PRINT(expstr, expsize); 1061 } 1062 } 1063 /* left-adjusting padding (always blank) */ 1064 if (flags & LADJUST) 1065 PAD(width - realsz, blanks); 1066 1067 /* finally, adjust ret */ 1068 ret += prsize; 1069 1070 FLUSH(); /* copy out the I/O vectors */ 1071 } 1072 done: 1073 FLUSH(); 1074 error: 1075 va_end(orgap); 1076 if (dtoaresult != NULL) 1077 freedtoa(dtoaresult); 1078 if (convbuf != NULL) 1079 free(convbuf); 1080 if (__sferror(fp)) 1081 ret = EOF; 1082 else 1083 fp->_flags |= savserr; 1084 if ((argtable != NULL) && (argtable != statargtable)) 1085 free (argtable); 1086 return (ret); 1087 /* NOTREACHED */ 1088 } 1089 1090