1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)vfprintf.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/vfprintf.c,v 1.90 2009/02/28 06:06:57 das Exp $ 34 * $DragonFly: src/lib/libc/stdio/vfprintf.c,v 1.16 2006/07/05 15:04:54 joerg Exp $ 35 */ 36 37 /* 38 * Actual printf innards. 39 * 40 * This code is large and complicated... 41 */ 42 43 #include "namespace.h" 44 #include <sys/types.h> 45 46 #include <ctype.h> 47 #include <limits.h> 48 #include <locale.h> 49 #include <stddef.h> 50 #include <stdint.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <wchar.h> 55 #include <printf.h> 56 57 #include <stdarg.h> 58 #include "un-namespace.h" 59 60 #include "libc_private.h" 61 #include "local.h" 62 #include "priv_stdio.h" 63 #include "printflocal.h" 64 65 static int __sprint(FILE *, struct __suio *); 66 static int __sbprintf(FILE *, const char *, va_list) __printflike(2, 0) 67 __noinline; 68 static char *__wcsconv(wchar_t *, int); 69 70 #define CHAR char 71 #include "printfcommon.h" 72 73 struct grouping_state { 74 char *thousands_sep; /* locale-specific thousands separator */ 75 int thousep_len; /* length of thousands_sep */ 76 const char *grouping; /* locale-specific numeric grouping rules */ 77 int lead; /* sig figs before decimal or group sep */ 78 int nseps; /* number of group separators with ' */ 79 int nrepeats; /* number of repeats of the last group */ 80 }; 81 82 /* 83 * Initialize the thousands' grouping state in preparation to print a 84 * number with ndigits digits. This routine returns the total number 85 * of bytes that will be needed. 86 */ 87 static int 88 grouping_init(struct grouping_state *gs, int ndigits) 89 { 90 struct lconv *locale; 91 92 locale = localeconv(); 93 gs->grouping = locale->grouping; 94 gs->thousands_sep = locale->thousands_sep; 95 gs->thousep_len = strlen(gs->thousands_sep); 96 97 gs->nseps = gs->nrepeats = 0; 98 gs->lead = ndigits; 99 while (*gs->grouping != CHAR_MAX) { 100 if (gs->lead <= *gs->grouping) 101 break; 102 gs->lead -= *gs->grouping; 103 if (*(gs->grouping+1)) { 104 gs->nseps++; 105 gs->grouping++; 106 } else 107 gs->nrepeats++; 108 } 109 return ((gs->nseps + gs->nrepeats) * gs->thousep_len); 110 } 111 112 /* 113 * Print a number with thousands' separators. 114 */ 115 static int 116 grouping_print(struct grouping_state *gs, struct io_state *iop, 117 const CHAR *cp, const CHAR *ep) 118 { 119 const CHAR *cp0 = cp; 120 121 if (io_printandpad(iop, cp, ep, gs->lead, zeroes)) 122 return (-1); 123 cp += gs->lead; 124 while (gs->nseps > 0 || gs->nrepeats > 0) { 125 if (gs->nrepeats > 0) 126 gs->nrepeats--; 127 else { 128 gs->grouping--; 129 gs->nseps--; 130 } 131 if (io_print(iop, gs->thousands_sep, gs->thousep_len)) 132 return (-1); 133 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes)) 134 return (-1); 135 cp += *gs->grouping; 136 } 137 if (cp > ep) 138 cp = ep; 139 return (cp - cp0); 140 } 141 142 /* 143 * Flush out all the vectors defined by the given uio, 144 * then reset it so that it can be reused. 145 */ 146 static int 147 __sprint(FILE *fp, struct __suio *uio) 148 { 149 int err; 150 151 if (uio->uio_resid == 0) { 152 uio->uio_iovcnt = 0; 153 return (0); 154 } 155 err = __sfvwrite(fp, uio); 156 uio->uio_resid = 0; 157 uio->uio_iovcnt = 0; 158 return (err); 159 } 160 161 /* 162 * Helper function for `fprintf to unbuffered unix file': creates a 163 * temporary buffer. We only work on write-only files; this avoids 164 * worries about ungetc buffers and so forth. 165 */ 166 static int 167 __sbprintf(FILE *fp, const char *fmt, va_list ap) 168 { 169 int ret; 170 FILE fake; 171 unsigned char buf[BUFSIZ]; 172 173 /* XXX This is probably not needed. */ 174 if (prepwrite(fp) != 0) 175 return (EOF); 176 177 /* copy the important variables */ 178 fake.pub._flags = fp->pub._flags & ~__SNBF; 179 fake.pub._fileno = fp->pub._fileno; 180 fake._cookie = fp->_cookie; 181 fake._write = fp->_write; 182 memcpy(WCIO_GET(&fake), WCIO_GET(fp), sizeof(struct wchar_io_data)); 183 184 /* set up the buffer */ 185 fake._bf._base = fake.pub._p = buf; 186 fake._bf._size = fake.pub._w = sizeof(buf); 187 fake.pub._lbfsize = 0; /* not actually used, but Just In Case */ 188 189 /* do the work, then copy any error status */ 190 ret = __vfprintf(&fake, fmt, ap); 191 if (ret >= 0 && __fflush(&fake)) 192 ret = EOF; 193 if (fake.pub._flags & __SERR) 194 fp->pub._flags |= __SERR; 195 return (ret); 196 } 197 198 /* 199 * Convert a wide character string argument for the %ls format to a multibyte 200 * string representation. If not -1, prec specifies the maximum number of 201 * bytes to output, and also means that we can't assume that the wide char. 202 * string ends is null-terminated. 203 */ 204 static char * 205 __wcsconv(wchar_t *wcsarg, int prec) 206 { 207 static const mbstate_t initial; 208 mbstate_t mbs; 209 char buf[MB_LEN_MAX]; 210 wchar_t *p; 211 char *convbuf; 212 size_t clen, nbytes; 213 214 /* Allocate space for the maximum number of bytes we could output. */ 215 if (prec < 0) { 216 p = wcsarg; 217 mbs = initial; 218 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs); 219 if (nbytes == (size_t)-1) 220 return (NULL); 221 } else { 222 /* 223 * Optimisation: if the output precision is small enough, 224 * just allocate enough memory for the maximum instead of 225 * scanning the string. 226 */ 227 if (prec < 128) { 228 nbytes = prec; 229 } else { 230 nbytes = 0; 231 p = wcsarg; 232 mbs = initial; 233 for (;;) { 234 clen = wcrtomb(buf, *p++, &mbs); 235 if (clen == 0 || clen == (size_t)-1 || 236 nbytes + clen > prec) 237 break; 238 nbytes += clen; 239 } 240 } 241 } 242 if ((convbuf = malloc(nbytes + 1)) == NULL) 243 return (NULL); 244 245 /* Fill the output buffer. */ 246 p = wcsarg; 247 mbs = initial; 248 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p, 249 nbytes, &mbs)) == (size_t)-1) { 250 free(convbuf); 251 return (NULL); 252 } 253 convbuf[nbytes] = '\0'; 254 return (convbuf); 255 } 256 257 /* 258 * MT-safe version 259 */ 260 int 261 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap) 262 { 263 int ret; 264 265 FLOCKFILE(fp); 266 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 267 if ((fp->pub._flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 268 fp->pub._fileno >= 0) 269 ret = __sbprintf(fp, fmt0, ap); 270 else 271 ret = __vfprintf(fp, fmt0, ap); 272 FUNLOCKFILE(fp); 273 return (ret); 274 } 275 276 /* 277 * The size of the buffer we use as scratch space for integer 278 * conversions, among other things. We need enough space to 279 * write a uintmax_t in octal (plus one byte). 280 */ 281 #if UINTMAX_MAX <= UINT64_MAX 282 #define BUF 32 283 #else 284 #error "BUF must be large enough to format a uintmax_t" 285 #endif 286 287 /* 288 * Non-MT-safe version 289 */ 290 int 291 __vfprintf(FILE *fp, const char *fmt0, va_list ap) 292 { 293 char *fmt; /* format string */ 294 int ch; /* character from fmt */ 295 int n, n2; /* handy integer (short term usage) */ 296 char *cp; /* handy char pointer (short term usage) */ 297 int flags; /* flags as above */ 298 int ret; /* return value accumulator */ 299 int width; /* width from format (%8d), or 0 */ 300 int prec; /* precision from format; <0 for N/A */ 301 char sign; /* sign prefix (' ', '+', '-', or \0) */ 302 struct grouping_state gs; /* thousands' grouping info */ 303 304 #ifndef NO_FLOATING_POINT 305 /* 306 * We can decompose the printed representation of floating 307 * point numbers into several parts, some of which may be empty: 308 * 309 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 310 * A B ---C--- D E F 311 * 312 * A: 'sign' holds this value if present; '\0' otherwise 313 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 314 * C: cp points to the string MMMNNN. Leading and trailing 315 * zeros are not in the string and must be added. 316 * D: expchar holds this character; '\0' if no exponent, e.g. %f 317 * F: at least two digits for decimal, at least one digit for hex 318 */ 319 char *decimal_point; /* locale specific decimal point */ 320 int decpt_len; /* length of decimal_point */ 321 int signflag; /* true if float is negative */ 322 union { /* floating point arguments %[aAeEfFgG] */ 323 double dbl; 324 long double ldbl; 325 } fparg; 326 int expt; /* integer value of exponent */ 327 char expchar; /* exponent character: [eEpP\0] */ 328 char *dtoaend; /* pointer to end of converted digits */ 329 int expsize; /* character count for expstr */ 330 int ndig; /* actual number of digits returned by dtoa */ 331 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 332 char *dtoaresult; /* buffer allocated by dtoa */ 333 #endif 334 u_long ulval; /* integer arguments %[diouxX] */ 335 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 336 int base; /* base for [diouxX] conversion */ 337 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 338 int realsz; /* field size expanded by dprec, sign, etc */ 339 int size; /* size of converted field or string */ 340 int prsize; /* max size of printed field */ 341 const char *xdigs; /* digits for %[xX] conversion */ 342 struct io_state io; /* I/O buffering state */ 343 char buf[BUF]; /* buffer with space for digits of uintmax_t */ 344 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ 345 union arg *argtable; /* args, built due to positional arg */ 346 union arg statargtable [STATIC_ARG_TBL_SIZE]; 347 int nextarg; /* 1-based argument index */ 348 va_list orgap; /* original argument pointer */ 349 char *convbuf; /* wide to multibyte conversion result */ 350 351 static const char xdigs_lower[16] = "0123456789abcdef"; 352 static const char xdigs_upper[16] = "0123456789ABCDEF"; 353 354 /* BEWARE, these `goto error' on error. */ 355 #define PRINT(ptr, len) { \ 356 if (io_print(&io, (ptr), (len))) \ 357 goto error; \ 358 } 359 #define PAD(howmany, with) { \ 360 if (io_pad(&io, (howmany), (with))) \ 361 goto error; \ 362 } 363 #define PRINTANDPAD(p, ep, len, with) { \ 364 if (io_printandpad(&io, (p), (ep), (len), (with))) \ 365 goto error; \ 366 } 367 #define FLUSH() { \ 368 if (io_flush(&io)) \ 369 goto error; \ 370 } 371 372 /* 373 * Get the argument indexed by nextarg. If the argument table is 374 * built, use it to get the argument. If its not, get the next 375 * argument (and arguments must be gotten sequentially). 376 */ 377 #define GETARG(type) \ 378 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ 379 (nextarg++, va_arg(ap, type))) 380 381 /* 382 * To extend shorts properly, we need both signed and unsigned 383 * argument extraction methods. 384 */ 385 #define SARG() \ 386 (flags&LONGINT ? GETARG(long) : \ 387 flags&SHORTINT ? (long)(short)GETARG(int) : \ 388 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 389 (long)GETARG(int)) 390 #define UARG() \ 391 (flags&LONGINT ? GETARG(u_long) : \ 392 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 393 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 394 (u_long)GETARG(u_int)) 395 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 396 #define SJARG() \ 397 (flags&INTMAXT ? GETARG(intmax_t) : \ 398 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 399 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 400 (intmax_t)GETARG(long long)) 401 #define UJARG() \ 402 (flags&INTMAXT ? GETARG(uintmax_t) : \ 403 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 404 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 405 (uintmax_t)GETARG(unsigned long long)) 406 407 /* 408 * Get * arguments, including the form *nn$. Preserve the nextarg 409 * that the argument can be gotten once the type is determined. 410 */ 411 #define GETASTER(val) \ 412 n2 = 0; \ 413 cp = fmt; \ 414 while (is_digit(*cp)) { \ 415 n2 = 10 * n2 + to_digit(*cp); \ 416 cp++; \ 417 } \ 418 if (*cp == '$') { \ 419 int hold = nextarg; \ 420 if (argtable == NULL) { \ 421 argtable = statargtable; \ 422 if (__find_arguments (fmt0, orgap, &argtable)) { \ 423 ret = EOF; \ 424 goto error; \ 425 } \ 426 } \ 427 nextarg = n2; \ 428 val = GETARG (int); \ 429 nextarg = hold; \ 430 fmt = ++cp; \ 431 } else { \ 432 val = GETARG (int); \ 433 } 434 435 if (__use_xprintf == 0 && getenv("USE_XPRINTF")) 436 __use_xprintf = 1; 437 if (__use_xprintf > 0) 438 return (__xvprintf(fp, fmt0, ap)); 439 440 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 441 if (prepwrite(fp) != 0) 442 return (EOF); 443 444 convbuf = NULL; 445 fmt = __DECONST(char *, fmt0); 446 argtable = NULL; 447 nextarg = 1; 448 va_copy(orgap, ap); 449 io_init(&io, fp); 450 ret = 0; 451 #ifndef NO_FLOATING_POINT 452 dtoaresult = NULL; 453 decimal_point = localeconv()->decimal_point; 454 /* The overwhelmingly common case is decpt_len == 1. */ 455 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point)); 456 #endif 457 458 /* 459 * Scan the format for conversions (`%' character). 460 */ 461 for (;;) { 462 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 463 /* void */; 464 if ((n = fmt - cp) != 0) { 465 if ((unsigned)ret + n > INT_MAX) { 466 ret = EOF; 467 goto error; 468 } 469 PRINT(cp, n); 470 ret += n; 471 } 472 if (ch == '\0') 473 goto done; 474 fmt++; /* skip over '%' */ 475 476 flags = 0; 477 dprec = 0; 478 width = 0; 479 prec = -1; 480 gs.grouping = NULL; 481 sign = '\0'; 482 ox[1] = '\0'; 483 484 rflag: ch = *fmt++; 485 reswitch: switch (ch) { 486 case ' ': 487 /*- 488 * ``If the space and + flags both appear, the space 489 * flag will be ignored.'' 490 * -- ANSI X3J11 491 */ 492 if (!sign) 493 sign = ' '; 494 goto rflag; 495 case '#': 496 flags |= ALT; 497 goto rflag; 498 case '*': 499 /*- 500 * ``A negative field width argument is taken as a 501 * - flag followed by a positive field width.'' 502 * -- ANSI X3J11 503 * They don't exclude field widths read from args. 504 */ 505 GETASTER(width); 506 if (width >= 0) 507 goto rflag; 508 width = -width; 509 /* FALLTHROUGH */ 510 case '-': 511 flags |= LADJUST; 512 goto rflag; 513 case '+': 514 sign = '+'; 515 goto rflag; 516 case '\'': 517 flags |= GROUPING; 518 goto rflag; 519 case '.': 520 if ((ch = *fmt++) == '*') { 521 GETASTER(prec); 522 goto rflag; 523 } 524 prec = 0; 525 while (is_digit(ch)) { 526 prec = 10 * prec + to_digit(ch); 527 ch = *fmt++; 528 } 529 goto reswitch; 530 case '0': 531 /*- 532 * ``Note that 0 is taken as a flag, not as the 533 * beginning of a field width.'' 534 * -- ANSI X3J11 535 */ 536 flags |= ZEROPAD; 537 goto rflag; 538 case '1': case '2': case '3': case '4': 539 case '5': case '6': case '7': case '8': case '9': 540 n = 0; 541 do { 542 n = 10 * n + to_digit(ch); 543 ch = *fmt++; 544 } while (is_digit(ch)); 545 if (ch == '$') { 546 nextarg = n; 547 if (argtable == NULL) { 548 argtable = statargtable; 549 if (__find_arguments (fmt0, orgap, 550 &argtable)) { 551 ret = EOF; 552 goto error; 553 } 554 } 555 goto rflag; 556 } 557 width = n; 558 goto reswitch; 559 #ifndef NO_FLOATING_POINT 560 case 'L': 561 flags |= LONGDBL; 562 goto rflag; 563 #endif 564 case 'h': 565 if (flags & SHORTINT) { 566 flags &= ~SHORTINT; 567 flags |= CHARINT; 568 } else 569 flags |= SHORTINT; 570 goto rflag; 571 case 'j': 572 flags |= INTMAXT; 573 goto rflag; 574 case 'l': 575 if (flags & LONGINT) { 576 flags &= ~LONGINT; 577 flags |= LLONGINT; 578 } else 579 flags |= LONGINT; 580 goto rflag; 581 case 'q': 582 flags |= LLONGINT; /* not necessarily */ 583 goto rflag; 584 case 't': 585 flags |= PTRDIFFT; 586 goto rflag; 587 case 'z': 588 flags |= SIZET; 589 goto rflag; 590 case 'C': 591 flags |= LONGINT; 592 /*FALLTHROUGH*/ 593 case 'c': 594 if (flags & LONGINT) { 595 static const mbstate_t initial; 596 mbstate_t mbs; 597 size_t mbseqlen; 598 599 mbs = initial; 600 mbseqlen = wcrtomb(cp = buf, 601 (wchar_t)GETARG(wint_t), &mbs); 602 if (mbseqlen == (size_t)-1) { 603 fp->pub._flags |= __SERR; 604 goto error; 605 } 606 size = (int)mbseqlen; 607 } else { 608 *(cp = buf) = GETARG(int); 609 size = 1; 610 } 611 sign = '\0'; 612 break; 613 case 'D': 614 flags |= LONGINT; 615 /*FALLTHROUGH*/ 616 case 'd': 617 case 'i': 618 if (flags & INTMAX_SIZE) { 619 ujval = SJARG(); 620 if ((intmax_t)ujval < 0) { 621 ujval = -ujval; 622 sign = '-'; 623 } 624 } else { 625 ulval = SARG(); 626 if ((long)ulval < 0) { 627 ulval = -ulval; 628 sign = '-'; 629 } 630 } 631 base = 10; 632 goto number; 633 #ifndef NO_FLOATING_POINT 634 case 'a': 635 case 'A': 636 if (ch == 'a') { 637 ox[1] = 'x'; 638 xdigs = xdigs_lower; 639 expchar = 'p'; 640 } else { 641 ox[1] = 'X'; 642 xdigs = xdigs_upper; 643 expchar = 'P'; 644 } 645 if (prec >= 0) 646 prec++; 647 if (dtoaresult != NULL) 648 freedtoa(dtoaresult); 649 if (flags & LONGDBL) { 650 fparg.ldbl = GETARG(long double); 651 dtoaresult = cp = 652 __hldtoa(fparg.ldbl, xdigs, prec, 653 &expt, &signflag, &dtoaend); 654 } else { 655 fparg.dbl = GETARG(double); 656 dtoaresult = cp = 657 __hdtoa(fparg.dbl, xdigs, prec, 658 &expt, &signflag, &dtoaend); 659 } 660 if (prec < 0) 661 prec = dtoaend - cp; 662 if (expt == INT_MAX) 663 ox[1] = '\0'; 664 goto fp_common; 665 case 'e': 666 case 'E': 667 expchar = ch; 668 if (prec < 0) /* account for digit before decpt */ 669 prec = DEFPREC + 1; 670 else 671 prec++; 672 goto fp_begin; 673 case 'f': 674 case 'F': 675 expchar = '\0'; 676 goto fp_begin; 677 case 'g': 678 case 'G': 679 expchar = ch - ('g' - 'e'); 680 if (prec == 0) 681 prec = 1; 682 fp_begin: 683 if (prec < 0) 684 prec = DEFPREC; 685 if (dtoaresult != NULL) 686 freedtoa(dtoaresult); 687 if (flags & LONGDBL) { 688 fparg.ldbl = GETARG(long double); 689 dtoaresult = cp = 690 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 691 &expt, &signflag, &dtoaend); 692 } else { 693 fparg.dbl = GETARG(double); 694 dtoaresult = cp = 695 dtoa(fparg.dbl, expchar ? 2 : 3, prec, 696 &expt, &signflag, &dtoaend); 697 if (expt == 9999) 698 expt = INT_MAX; 699 } 700 fp_common: 701 if (signflag) 702 sign = '-'; 703 if (expt == INT_MAX) { /* inf or nan */ 704 if (*cp == 'N') { 705 cp = (ch >= 'a') ? "nan" : "NAN"; 706 sign = '\0'; 707 } else 708 cp = (ch >= 'a') ? "inf" : "INF"; 709 size = 3; 710 flags &= ~ZEROPAD; 711 break; 712 } 713 flags |= FPT; 714 ndig = dtoaend - cp; 715 if (ch == 'g' || ch == 'G') { 716 if (expt > -4 && expt <= prec) { 717 /* Make %[gG] smell like %[fF] */ 718 expchar = '\0'; 719 if (flags & ALT) 720 prec -= expt; 721 else 722 prec = ndig - expt; 723 if (prec < 0) 724 prec = 0; 725 } else { 726 /* 727 * Make %[gG] smell like %[eE], but 728 * trim trailing zeroes if no # flag. 729 */ 730 if (!(flags & ALT)) 731 prec = ndig; 732 } 733 } 734 if (expchar) { 735 expsize = exponent(expstr, expt - 1, expchar); 736 size = expsize + prec; 737 if (prec > 1 || flags & ALT) 738 size += decpt_len; 739 } else { 740 /* space for digits before decimal point */ 741 if (expt > 0) 742 size = expt; 743 else /* "0" */ 744 size = 1; 745 /* space for decimal pt and following digits */ 746 if (prec || flags & ALT) 747 size += prec + decpt_len; 748 if ((flags & GROUPING) && expt > 0) 749 size += grouping_init(&gs, expt); 750 } 751 break; 752 #endif /* !NO_FLOATING_POINT */ 753 case 'n': 754 /* 755 * Assignment-like behavior is specified if the 756 * value overflows or is otherwise unrepresentable. 757 * C99 says to use `signed char' for %hhn conversions. 758 */ 759 if (flags & LLONGINT) 760 *GETARG(long long *) = ret; 761 else if (flags & SIZET) 762 *GETARG(ssize_t *) = (ssize_t)ret; 763 else if (flags & PTRDIFFT) 764 *GETARG(ptrdiff_t *) = ret; 765 else if (flags & INTMAXT) 766 *GETARG(intmax_t *) = ret; 767 else if (flags & LONGINT) 768 *GETARG(long *) = ret; 769 else if (flags & SHORTINT) 770 *GETARG(short *) = ret; 771 else if (flags & CHARINT) 772 *GETARG(signed char *) = ret; 773 else 774 *GETARG(int *) = ret; 775 continue; /* no output */ 776 case 'O': 777 flags |= LONGINT; 778 /*FALLTHROUGH*/ 779 case 'o': 780 if (flags & INTMAX_SIZE) 781 ujval = UJARG(); 782 else 783 ulval = UARG(); 784 base = 8; 785 goto nosign; 786 case 'p': 787 /*- 788 * ``The argument shall be a pointer to void. The 789 * value of the pointer is converted to a sequence 790 * of printable characters, in an implementation- 791 * defined manner.'' 792 * -- ANSI X3J11 793 */ 794 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 795 base = 16; 796 xdigs = xdigs_lower; 797 flags = flags | INTMAXT; 798 ox[1] = 'x'; 799 goto nosign; 800 case 'S': 801 flags |= LONGINT; 802 /*FALLTHROUGH*/ 803 case 's': 804 if (flags & LONGINT) { 805 wchar_t *wcp; 806 807 if (convbuf != NULL) 808 free(convbuf); 809 if ((wcp = GETARG(wchar_t *)) == NULL) 810 cp = "(null)"; 811 else { 812 convbuf = __wcsconv(wcp, prec); 813 if (convbuf == NULL) { 814 fp->pub._flags |= __SERR; 815 goto error; 816 } 817 cp = convbuf; 818 } 819 } else if ((cp = GETARG(char *)) == NULL) 820 cp = "(null)"; 821 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp); 822 sign = '\0'; 823 break; 824 case 'U': 825 flags |= LONGINT; 826 /*FALLTHROUGH*/ 827 case 'u': 828 if (flags & INTMAX_SIZE) 829 ujval = UJARG(); 830 else 831 ulval = UARG(); 832 base = 10; 833 goto nosign; 834 case 'X': 835 xdigs = xdigs_upper; 836 goto hex; 837 case 'x': 838 xdigs = xdigs_lower; 839 hex: 840 if (flags & INTMAX_SIZE) 841 ujval = UJARG(); 842 else 843 ulval = UARG(); 844 base = 16; 845 /* leading 0x/X only if non-zero */ 846 if (flags & ALT && 847 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 848 ox[1] = ch; 849 850 flags &= ~GROUPING; 851 /* unsigned conversions */ 852 nosign: sign = '\0'; 853 /*- 854 * ``... diouXx conversions ... if a precision is 855 * specified, the 0 flag will be ignored.'' 856 * -- ANSI X3J11 857 */ 858 number: if ((dprec = prec) >= 0) 859 flags &= ~ZEROPAD; 860 861 /*- 862 * ``The result of converting a zero value with an 863 * explicit precision of zero is no characters.'' 864 * -- ANSI X3J11 865 * 866 * ``The C Standard is clear enough as is. The call 867 * printf("%#.0o", 0) should print 0.'' 868 * -- Defect Report #151 869 */ 870 cp = buf + BUF; 871 if (flags & INTMAX_SIZE) { 872 if (ujval != 0 || prec != 0 || 873 (flags & ALT && base == 8)) 874 cp = __ujtoa(ujval, cp, base, 875 flags & ALT, xdigs); 876 } else { 877 if (ulval != 0 || prec != 0 || 878 (flags & ALT && base == 8)) 879 cp = __ultoa(ulval, cp, base, 880 flags & ALT, xdigs); 881 } 882 size = buf + BUF - cp; 883 if (size > BUF) /* should never happen */ 884 abort(); 885 if ((flags & GROUPING) && size != 0) 886 size += grouping_init(&gs, size); 887 break; 888 default: /* "%?" prints ?, unless ? is NUL */ 889 if (ch == '\0') 890 goto done; 891 /* pretend it was %c with argument ch */ 892 cp = buf; 893 *cp = ch; 894 size = 1; 895 sign = '\0'; 896 break; 897 } 898 899 /* 900 * All reasonable formats wind up here. At this point, `cp' 901 * points to a string which (if not flags&LADJUST) should be 902 * padded out to `width' places. If flags&ZEROPAD, it should 903 * first be prefixed by any sign or other prefix; otherwise, 904 * it should be blank padded before the prefix is emitted. 905 * After any left-hand padding and prefixing, emit zeroes 906 * required by a decimal [diouxX] precision, then print the 907 * string proper, then emit zeroes required by any leftover 908 * floating precision; finally, if LADJUST, pad with blanks. 909 * 910 * Compute actual size, so we know how much to pad. 911 * size excludes decimal prec; realsz includes it. 912 */ 913 realsz = dprec > size ? dprec : size; 914 if (sign) 915 realsz++; 916 if (ox[1]) 917 realsz += 2; 918 919 prsize = width > realsz ? width : realsz; 920 if ((unsigned)ret + prsize > INT_MAX) { 921 ret = EOF; 922 goto error; 923 } 924 925 /* right-adjusting blank padding */ 926 if ((flags & (LADJUST|ZEROPAD)) == 0) 927 PAD(width - realsz, blanks); 928 929 /* prefix */ 930 if (sign) 931 PRINT(&sign, 1); 932 933 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 934 ox[0] = '0'; 935 PRINT(ox, 2); 936 } 937 938 /* right-adjusting zero padding */ 939 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 940 PAD(width - realsz, zeroes); 941 942 /* the string or number proper */ 943 #ifndef NO_FLOATING_POINT 944 if ((flags & FPT) == 0) { 945 #endif 946 /* leading zeroes from decimal precision */ 947 PAD(dprec - size, zeroes); 948 if (gs.grouping) { 949 if (grouping_print(&gs, &io, cp, buf+BUF) < 0) 950 goto error; 951 } else { 952 PRINT(cp, size); 953 } 954 #ifndef NO_FLOATING_POINT 955 } else { /* glue together f_p fragments */ 956 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 957 if (expt <= 0) { 958 PRINT(zeroes, 1); 959 if (prec || flags & ALT) 960 PRINT(decimal_point,decpt_len); 961 PAD(-expt, zeroes); 962 /* already handled initial 0's */ 963 prec += expt; 964 } else { 965 if (gs.grouping) { 966 n = grouping_print(&gs, &io, 967 cp, dtoaend); 968 if (n < 0) 969 goto error; 970 cp += n; 971 } else { 972 PRINTANDPAD(cp, dtoaend, 973 expt, zeroes); 974 cp += expt; 975 } 976 if (prec || flags & ALT) 977 PRINT(decimal_point,decpt_len); 978 } 979 PRINTANDPAD(cp, dtoaend, prec, zeroes); 980 } else { /* %[eE] or sufficiently long %[gG] */ 981 if (prec > 1 || flags & ALT) { 982 PRINT(cp++, 1); 983 PRINT(decimal_point, decpt_len); 984 PRINT(cp, ndig-1); 985 PAD(prec - ndig, zeroes); 986 } else /* XeYYY */ 987 PRINT(cp, 1); 988 PRINT(expstr, expsize); 989 } 990 } 991 #endif 992 /* left-adjusting padding (always blank) */ 993 if (flags & LADJUST) 994 PAD(width - realsz, blanks); 995 996 /* finally, adjust ret */ 997 ret += prsize; 998 999 FLUSH(); /* copy out the I/O vectors */ 1000 } 1001 done: 1002 FLUSH(); 1003 error: 1004 va_end(orgap); 1005 #ifndef NO_FLOATING_POINT 1006 if (dtoaresult != NULL) 1007 freedtoa(dtoaresult); 1008 #endif 1009 if (convbuf != NULL) 1010 free(convbuf); 1011 if (__sferror(fp)) 1012 ret = EOF; 1013 if ((argtable != NULL) && (argtable != statargtable)) 1014 free(argtable); 1015 return (ret); 1016 /* NOTREACHED */ 1017 } 1018 1019