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 __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 int saved_errno; 321 char sign; /* sign prefix (' ', '+', '-', or \0) */ 322 struct grouping_state gs; /* thousands' grouping info */ 323 324 #ifndef NO_FLOATING_POINT 325 /* 326 * We can decompose the printed representation of floating 327 * point numbers into several parts, some of which may be empty: 328 * 329 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 330 * A B ---C--- D E F 331 * 332 * A: 'sign' holds this value if present; '\0' otherwise 333 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 334 * C: cp points to the string MMMNNN. Leading and trailing 335 * zeros are not in the string and must be added. 336 * D: expchar holds this character; '\0' if no exponent, e.g. %f 337 * F: at least two digits for decimal, at least one digit for hex 338 */ 339 char *decimal_point; /* locale specific decimal point */ 340 int decpt_len; /* length of decimal_point */ 341 int signflag; /* true if float is negative */ 342 union { /* floating point arguments %[aAeEfFgG] */ 343 double dbl; 344 long double ldbl; 345 } fparg; 346 int expt; /* integer value of exponent */ 347 char expchar; /* exponent character: [eEpP\0] */ 348 char *dtoaend; /* pointer to end of converted digits */ 349 int expsize; /* character count for expstr */ 350 int ndig; /* actual number of digits returned by dtoa */ 351 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 352 char *dtoaresult; /* buffer allocated by dtoa */ 353 #endif 354 u_long ulval; /* integer arguments %[diouxX] */ 355 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 356 int base; /* base for [diouxX] conversion */ 357 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 358 int realsz; /* field size expanded by dprec, sign, etc */ 359 int size; /* size of converted field or string */ 360 int prsize; /* max size of printed field */ 361 const char *xdigs; /* digits for %[xX] conversion */ 362 struct io_state io; /* I/O buffering state */ 363 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 364 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 365 union arg *argtable; /* args, built due to positional arg */ 366 union arg statargtable [STATIC_ARG_TBL_SIZE]; 367 int nextarg; /* 1-based argument index */ 368 va_list orgap; /* original argument pointer */ 369 char *convbuf; /* wide to multibyte conversion result */ 370 int savserr; 371 372 static const char xdigs_lower[16] = "0123456789abcdef"; 373 static const char xdigs_upper[16] = "0123456789ABCDEF"; 374 375 /* BEWARE, these `goto error' on error. */ 376 #define PRINT(ptr, len) { \ 377 if (io_print(&io, (ptr), (len), locale)) \ 378 goto error; \ 379 } 380 #define PAD(howmany, with) { \ 381 if (io_pad(&io, (howmany), (with), locale)) \ 382 goto error; \ 383 } 384 #define PRINTANDPAD(p, ep, len, with) { \ 385 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \ 386 goto error; \ 387 } 388 #define FLUSH() { \ 389 if (io_flush(&io, locale)) \ 390 goto error; \ 391 } 392 393 /* 394 * Get the argument indexed by nextarg. If the argument table is 395 * built, use it to get the argument. If its not, get the next 396 * argument (and arguments must be gotten sequentially). 397 */ 398 #define GETARG(type) \ 399 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 400 (nextarg++, va_arg(ap, type))) 401 402 /* 403 * To extend shorts properly, we need both signed and unsigned 404 * argument extraction methods. 405 */ 406 #define SARG() \ 407 (flags&LONGINT ? GETARG(long) : \ 408 flags&SHORTINT ? (long)(short)GETARG(int) : \ 409 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 410 (long)GETARG(int)) 411 #define UARG() \ 412 (flags&LONGINT ? GETARG(u_long) : \ 413 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 414 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 415 (u_long)GETARG(u_int)) 416 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 417 #define SJARG() \ 418 (flags&INTMAXT ? GETARG(intmax_t) : \ 419 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 420 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 421 (intmax_t)GETARG(long long)) 422 #define UJARG() \ 423 (flags&INTMAXT ? GETARG(uintmax_t) : \ 424 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 425 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 426 (uintmax_t)GETARG(unsigned long long)) 427 428 /* 429 * Get * arguments, including the form *nn$. Preserve the nextarg 430 * that the argument can be gotten once the type is determined. 431 */ 432 #define GETASTER(val) \ 433 n2 = 0; \ 434 cp = fmt; \ 435 while (is_digit(*cp)) { \ 436 n2 = 10 * n2 + to_digit(*cp); \ 437 cp++; \ 438 } \ 439 if (*cp == '$') { \ 440 int hold = nextarg; \ 441 if (argtable == NULL) { \ 442 argtable = statargtable; \ 443 if (__find_arguments (fmt0, orgap, &argtable)) { \ 444 ret = EOF; \ 445 goto error; \ 446 } \ 447 } \ 448 nextarg = n2; \ 449 val = GETARG (int); \ 450 nextarg = hold; \ 451 fmt = ++cp; \ 452 } else { \ 453 val = GETARG (int); \ 454 } 455 456 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 457 __use_xprintf = 1; 458 if (__use_xprintf > 0) 459 return (__xvprintf(fp, fmt0, ap)); 460 461 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 462 if (prepwrite(fp) != 0) { 463 errno = EBADF; 464 return (EOF); 465 } 466 467 savserr = fp->_flags & __SERR; 468 fp->_flags &= ~__SERR; 469 470 saved_errno = errno; 471 convbuf = NULL; 472 fmt = (char *)fmt0; 473 argtable = NULL; 474 nextarg = 1; 475 va_copy(orgap, ap); 476 io_init(&io, fp); 477 ret = 0; 478 #ifndef NO_FLOATING_POINT 479 dtoaresult = NULL; 480 decimal_point = localeconv_l(locale)->decimal_point; 481 /* The overwhelmingly common case is decpt_len == 1. */ 482 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 483 #endif 484 485 /* 486 * Scan the format for conversions (`%' character). 487 */ 488 for (;;) { 489 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 490 /* void */; 491 if ((n = fmt - cp) != 0) { 492 if ((unsigned)ret + n > INT_MAX) { 493 ret = EOF; 494 errno = EOVERFLOW; 495 goto error; 496 } 497 PRINT(cp, n); 498 ret += n; 499 } 500 if (ch == '\0') 501 goto done; 502 fmt++; /* skip over '%' */ 503 504 flags = 0; 505 dprec = 0; 506 width = 0; 507 prec = -1; 508 gs.grouping = NULL; 509 sign = '\0'; 510 ox[1] = '\0'; 511 512 rflag: ch = *fmt++; 513 reswitch: switch (ch) { 514 case ' ': 515 /*- 516 * ``If the space and + flags both appear, the space 517 * flag will be ignored.'' 518 * -- ANSI X3J11 519 */ 520 if (!sign) 521 sign = ' '; 522 goto rflag; 523 case '#': 524 flags |= ALT; 525 goto rflag; 526 case '*': 527 /*- 528 * ``A negative field width argument is taken as a 529 * - flag followed by a positive field width.'' 530 * -- ANSI X3J11 531 * They don't exclude field widths read from args. 532 */ 533 GETASTER (width); 534 if (width >= 0) 535 goto rflag; 536 width = -width; 537 /* FALLTHROUGH */ 538 case '-': 539 flags |= LADJUST; 540 goto rflag; 541 case '+': 542 sign = '+'; 543 goto rflag; 544 case '\'': 545 flags |= GROUPING; 546 goto rflag; 547 case '.': 548 if ((ch = *fmt++) == '*') { 549 GETASTER (prec); 550 goto rflag; 551 } 552 prec = 0; 553 while (is_digit(ch)) { 554 prec = 10 * prec + to_digit(ch); 555 ch = *fmt++; 556 } 557 goto reswitch; 558 case '0': 559 /*- 560 * ``Note that 0 is taken as a flag, not as the 561 * beginning of a field width.'' 562 * -- ANSI X3J11 563 */ 564 flags |= ZEROPAD; 565 goto rflag; 566 case '1': case '2': case '3': case '4': 567 case '5': case '6': case '7': case '8': case '9': 568 n = 0; 569 do { 570 n = 10 * n + to_digit(ch); 571 ch = *fmt++; 572 } while (is_digit(ch)); 573 if (ch == '$') { 574 nextarg = n; 575 if (argtable == NULL) { 576 argtable = statargtable; 577 if (__find_arguments (fmt0, orgap, 578 &argtable)) { 579 ret = EOF; 580 goto error; 581 } 582 } 583 goto rflag; 584 } 585 width = n; 586 goto reswitch; 587 #ifndef NO_FLOATING_POINT 588 case 'L': 589 flags |= LONGDBL; 590 goto rflag; 591 #endif 592 case 'h': 593 if (flags & SHORTINT) { 594 flags &= ~SHORTINT; 595 flags |= CHARINT; 596 } else 597 flags |= SHORTINT; 598 goto rflag; 599 case 'j': 600 flags |= INTMAXT; 601 goto rflag; 602 case 'l': 603 if (flags & LONGINT) { 604 flags &= ~LONGINT; 605 flags |= LLONGINT; 606 } else 607 flags |= LONGINT; 608 goto rflag; 609 case 'q': 610 flags |= LLONGINT; /* not necessarily */ 611 goto rflag; 612 case 't': 613 flags |= PTRDIFFT; 614 goto rflag; 615 case 'z': 616 flags |= SIZET; 617 goto rflag; 618 case 'C': 619 flags |= LONGINT; 620 /*FALLTHROUGH*/ 621 case 'c': 622 if (flags & LONGINT) { 623 static const mbstate_t initial; 624 mbstate_t mbs; 625 size_t mbseqlen; 626 627 mbs = initial; 628 mbseqlen = wcrtomb(cp = buf, 629 (wchar_t)GETARG(wint_t), &mbs); 630 if (mbseqlen == (size_t)-1) { 631 fp->_flags |= __SERR; 632 goto error; 633 } 634 size = (int)mbseqlen; 635 } else { 636 *(cp = buf) = GETARG(int); 637 size = 1; 638 } 639 sign = '\0'; 640 break; 641 case 'D': 642 flags |= LONGINT; 643 /*FALLTHROUGH*/ 644 case 'd': 645 case 'i': 646 if (flags & INTMAX_SIZE) { 647 ujval = SJARG(); 648 if ((intmax_t)ujval < 0) { 649 ujval = -ujval; 650 sign = '-'; 651 } 652 } else { 653 ulval = SARG(); 654 if ((long)ulval < 0) { 655 ulval = -ulval; 656 sign = '-'; 657 } 658 } 659 base = 10; 660 goto number; 661 #ifndef NO_FLOATING_POINT 662 case 'a': 663 case 'A': 664 if (ch == 'a') { 665 ox[1] = 'x'; 666 xdigs = xdigs_lower; 667 expchar = 'p'; 668 } else { 669 ox[1] = 'X'; 670 xdigs = xdigs_upper; 671 expchar = 'P'; 672 } 673 if (prec >= 0) 674 prec++; 675 if (dtoaresult != NULL) 676 freedtoa(dtoaresult); 677 if (flags & LONGDBL) { 678 fparg.ldbl = GETARG(long double); 679 dtoaresult = cp = 680 __hldtoa(fparg.ldbl, xdigs, prec, 681 &expt, &signflag, &dtoaend); 682 } else { 683 fparg.dbl = GETARG(double); 684 dtoaresult = cp = 685 __hdtoa(fparg.dbl, xdigs, prec, 686 &expt, &signflag, &dtoaend); 687 } 688 if (prec < 0) 689 prec = dtoaend - cp; 690 if (expt == INT_MAX) 691 ox[1] = '\0'; 692 goto fp_common; 693 case 'e': 694 case 'E': 695 expchar = ch; 696 if (prec < 0) /* account for digit before decpt */ 697 prec = DEFPREC + 1; 698 else 699 prec++; 700 goto fp_begin; 701 case 'f': 702 case 'F': 703 expchar = '\0'; 704 goto fp_begin; 705 case 'g': 706 case 'G': 707 expchar = ch - ('g' - 'e'); 708 if (prec == 0) 709 prec = 1; 710 fp_begin: 711 if (prec < 0) 712 prec = DEFPREC; 713 if (dtoaresult != NULL) 714 freedtoa(dtoaresult); 715 if (flags & LONGDBL) { 716 fparg.ldbl = GETARG(long double); 717 dtoaresult = cp = 718 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 719 &expt, &signflag, &dtoaend); 720 } else { 721 fparg.dbl = GETARG(double); 722 dtoaresult = cp = 723 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 724 &expt, &signflag, &dtoaend); 725 if (expt == 9999) 726 expt = INT_MAX; 727 } 728 fp_common: 729 if (signflag) 730 sign = '-'; 731 if (expt == INT_MAX) { /* inf or nan */ 732 if (*cp == 'N') { 733 cp = (ch >= 'a') ? "nan" : "NAN"; 734 sign = '\0'; 735 } else 736 cp = (ch >= 'a') ? "inf" : "INF"; 737 size = 3; 738 flags &= ~ZEROPAD; 739 break; 740 } 741 flags |= FPT; 742 ndig = dtoaend - cp; 743 if (ch == 'g' || ch == 'G') { 744 if (expt > -4 && expt <= prec) { 745 /* Make %[gG] smell like %[fF] */ 746 expchar = '\0'; 747 if (flags & ALT) 748 prec -= expt; 749 else 750 prec = ndig - expt; 751 if (prec < 0) 752 prec = 0; 753 } else { 754 /* 755 * Make %[gG] smell like %[eE], but 756 * trim trailing zeroes if no # flag. 757 */ 758 if (!(flags & ALT)) 759 prec = ndig; 760 } 761 } 762 if (expchar) { 763 expsize = exponent(expstr, expt - 1, expchar); 764 size = expsize + prec; 765 if (prec > 1 || flags & ALT) 766 size += decpt_len; 767 } else { 768 /* space for digits before decimal point */ 769 if (expt > 0) 770 size = expt; 771 else /* "0" */ 772 size = 1; 773 /* space for decimal pt and following digits */ 774 if (prec || flags & ALT) 775 size += prec + decpt_len; 776 if ((flags & GROUPING) && expt > 0) 777 size += grouping_init(&gs, expt, locale); 778 } 779 break; 780 #endif /* !NO_FLOATING_POINT */ 781 case 'm': 782 cp = strerror(saved_errno); 783 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 784 sign = '\0'; 785 break; 786 case 'n': 787 /* 788 * Assignment-like behavior is specified if the 789 * value overflows or is otherwise unrepresentable. 790 * C99 says to use `signed char' for %hhn conversions. 791 */ 792 if (flags & LLONGINT) 793 *GETARG(long long *) = ret; 794 else if (flags & SIZET) 795 *GETARG(ssize_t *) = (ssize_t)ret; 796 else if (flags & PTRDIFFT) 797 *GETARG(ptrdiff_t *) = ret; 798 else if (flags & INTMAXT) 799 *GETARG(intmax_t *) = ret; 800 else if (flags & LONGINT) 801 *GETARG(long *) = ret; 802 else if (flags & SHORTINT) 803 *GETARG(short *) = ret; 804 else if (flags & CHARINT) 805 *GETARG(signed char *) = ret; 806 else 807 *GETARG(int *) = ret; 808 continue; /* no output */ 809 case 'O': 810 flags |= LONGINT; 811 /*FALLTHROUGH*/ 812 case 'o': 813 if (flags & INTMAX_SIZE) 814 ujval = UJARG(); 815 else 816 ulval = UARG(); 817 base = 8; 818 goto nosign; 819 case 'p': 820 /*- 821 * ``The argument shall be a pointer to void. The 822 * value of the pointer is converted to a sequence 823 * of printable characters, in an implementation- 824 * defined manner.'' 825 * -- ANSI X3J11 826 */ 827 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 828 base = 16; 829 xdigs = xdigs_lower; 830 flags = flags | INTMAXT; 831 ox[1] = 'x'; 832 goto nosign; 833 case 'S': 834 flags |= LONGINT; 835 /*FALLTHROUGH*/ 836 case 's': 837 if (flags & LONGINT) { 838 wchar_t *wcp; 839 840 if (convbuf != NULL) 841 free(convbuf); 842 if ((wcp = GETARG(wchar_t *)) == NULL) 843 cp = "(null)"; 844 else { 845 convbuf = __wcsconv(wcp, prec); 846 if (convbuf == NULL) { 847 fp->_flags |= __SERR; 848 goto error; 849 } 850 cp = convbuf; 851 } 852 } else if ((cp = GETARG(char *)) == NULL) 853 cp = "(null)"; 854 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 855 sign = '\0'; 856 break; 857 case 'U': 858 flags |= LONGINT; 859 /*FALLTHROUGH*/ 860 case 'u': 861 if (flags & INTMAX_SIZE) 862 ujval = UJARG(); 863 else 864 ulval = UARG(); 865 base = 10; 866 goto nosign; 867 case 'X': 868 xdigs = xdigs_upper; 869 goto hex; 870 case 'x': 871 xdigs = xdigs_lower; 872 hex: 873 if (flags & INTMAX_SIZE) 874 ujval = UJARG(); 875 else 876 ulval = UARG(); 877 base = 16; 878 /* leading 0x/X only if non-zero */ 879 if (flags & ALT && 880 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 881 ox[1] = ch; 882 883 flags &= ~GROUPING; 884 /* unsigned conversions */ 885 nosign: sign = '\0'; 886 /*- 887 * ``... diouXx conversions ... if a precision is 888 * specified, the 0 flag will be ignored.'' 889 * -- ANSI X3J11 890 */ 891 number: if ((dprec = prec) >= 0) 892 flags &= ~ZEROPAD; 893 894 /*- 895 * ``The result of converting a zero value with an 896 * explicit precision of zero is no characters.'' 897 * -- ANSI X3J11 898 * 899 * ``The C Standard is clear enough as is. The call 900 * printf("%#.0o", 0) should print 0.'' 901 * -- Defect Report #151 902 */ 903 cp = buf + BUF; 904 if (flags & INTMAX_SIZE) { 905 if (ujval != 0 || prec != 0 || 906 (flags & ALT && base == 8)) 907 cp = __ujtoa(ujval, cp, base, 908 flags & ALT, xdigs); 909 } else { 910 if (ulval != 0 || prec != 0 || 911 (flags & ALT && base == 8)) 912 cp = __ultoa(ulval, cp, base, 913 flags & ALT, xdigs); 914 } 915 size = buf + BUF - cp; 916 if (size > BUF) /* should never happen */ 917 abort(); 918 if ((flags & GROUPING) && size != 0) 919 size += grouping_init(&gs, size, locale); 920 break; 921 default: /* "%?" prints ?, unless ? is NUL */ 922 if (ch == '\0') 923 goto done; 924 /* pretend it was %c with argument ch */ 925 cp = buf; 926 *cp = ch; 927 size = 1; 928 sign = '\0'; 929 break; 930 } 931 932 /* 933 * All reasonable formats wind up here. At this point, `cp' 934 * points to a string which (if not flags&LADJUST) should be 935 * padded out to `width' places. If flags&ZEROPAD, it should 936 * first be prefixed by any sign or other prefix; otherwise, 937 * it should be blank padded before the prefix is emitted. 938 * After any left-hand padding and prefixing, emit zeroes 939 * required by a decimal [diouxX] precision, then print the 940 * string proper, then emit zeroes required by any leftover 941 * floating precision; finally, if LADJUST, pad with blanks. 942 * 943 * Compute actual size, so we know how much to pad. 944 * size excludes decimal prec; realsz includes it. 945 */ 946 realsz = dprec > size ? dprec : size; 947 if (sign) 948 realsz++; 949 if (ox[1]) 950 realsz += 2; 951 952 prsize = width > realsz ? width : realsz; 953 if ((unsigned)ret + prsize > INT_MAX) { 954 ret = EOF; 955 errno = EOVERFLOW; 956 goto error; 957 } 958 959 /* right-adjusting blank padding */ 960 if ((flags & (LADJUST|ZEROPAD)) == 0) 961 PAD(width - realsz, blanks); 962 963 /* prefix */ 964 if (sign) 965 PRINT(&sign, 1); 966 967 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 968 ox[0] = '0'; 969 PRINT(ox, 2); 970 } 971 972 /* right-adjusting zero padding */ 973 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 974 PAD(width - realsz, zeroes); 975 976 /* the string or number proper */ 977 #ifndef NO_FLOATING_POINT 978 if ((flags & FPT) == 0) { 979 #endif 980 /* leading zeroes from decimal precision */ 981 PAD(dprec - size, zeroes); 982 if (gs.grouping) { 983 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0) 984 goto error; 985 } else { 986 PRINT(cp, size); 987 } 988 #ifndef NO_FLOATING_POINT 989 } else { /* glue together f_p fragments */ 990 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 991 if (expt <= 0) { 992 PRINT(zeroes, 1); 993 if (prec || flags & ALT) 994 PRINT(decimal_point,decpt_len); 995 PAD(-expt, zeroes); 996 /* already handled initial 0's */ 997 prec += expt; 998 } else { 999 if (gs.grouping) { 1000 n = grouping_print(&gs, &io, 1001 cp, dtoaend, locale); 1002 if (n < 0) 1003 goto error; 1004 cp += n; 1005 } else { 1006 PRINTANDPAD(cp, dtoaend, 1007 expt, zeroes); 1008 cp += expt; 1009 } 1010 if (prec || flags & ALT) 1011 PRINT(decimal_point,decpt_len); 1012 } 1013 PRINTANDPAD(cp, dtoaend, prec, zeroes); 1014 } else { /* %[eE] or sufficiently long %[gG] */ 1015 if (prec > 1 || flags & ALT) { 1016 PRINT(cp++, 1); 1017 PRINT(decimal_point, decpt_len); 1018 PRINT(cp, ndig-1); 1019 PAD(prec - ndig, zeroes); 1020 } else /* XeYYY */ 1021 PRINT(cp, 1); 1022 PRINT(expstr, expsize); 1023 } 1024 } 1025 #endif 1026 /* left-adjusting padding (always blank) */ 1027 if (flags & LADJUST) 1028 PAD(width - realsz, blanks); 1029 1030 /* finally, adjust ret */ 1031 ret += prsize; 1032 1033 FLUSH(); /* copy out the I/O vectors */ 1034 } 1035 done: 1036 FLUSH(); 1037 error: 1038 va_end(orgap); 1039 #ifndef NO_FLOATING_POINT 1040 if (dtoaresult != NULL) 1041 freedtoa(dtoaresult); 1042 #endif 1043 if (convbuf != NULL) 1044 free(convbuf); 1045 if (__sferror(fp)) 1046 ret = EOF; 1047 else 1048 fp->_flags |= savserr; 1049 if ((argtable != NULL) && (argtable != statargtable)) 1050 free (argtable); 1051 return (ret); 1052 /* NOTREACHED */ 1053 } 1054 1055