1 /* $NetBSD: vfwprintf.c,v 1.32 2013/05/17 12:55:57 joerg Exp $ */ 2 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 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93"; 39 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwprintf.c,v 1.27 2007/01/09 00:28:08 imp Exp $"); 40 #else 41 __RCSID("$NetBSD: vfwprintf.c,v 1.32 2013/05/17 12:55:57 joerg Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * Actual {w,}printf innards. 47 */ 48 49 #include "namespace.h" 50 #include <sys/types.h> 51 52 #include <assert.h> 53 #include <ctype.h> 54 #include <limits.h> 55 #include <locale.h> 56 #include <stdarg.h> 57 #include <stddef.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <errno.h> 63 #include <wchar.h> 64 #include <wctype.h> 65 66 #include "reentrant.h" 67 #include "setlocale_local.h" 68 #include "local.h" 69 #include "extern.h" 70 #include "fvwrite.h" 71 72 #ifndef NARROW 73 #define MCHAR_T char 74 #define CHAR_T wchar_t 75 #define STRLEN(a) wcslen(a) 76 #define MEMCHR(a, b, c) wmemchr(a, b, c) 77 #define SCONV(a, b, loc) __mbsconv(a, b, loc) 78 #define STRCONST(a) L ## a 79 #define WDECL(a, b) a ## w ## b 80 #define END_OF_FILE WEOF 81 #define MULTI 0 82 #else 83 #define MCHAR_T wchar_t 84 #define CHAR_T char 85 #define STRLEN(a) strlen(a) 86 #define MEMCHR(a, b, c) memchr(a, b, c) 87 #define SCONV(a, b, loc) __wcsconv(a, b, loc) 88 #define STRCONST(a) a 89 #define WDECL(a, b) a ## b 90 #define END_OF_FILE EOF 91 #define MULTI LONGINT 92 #endif 93 94 union arg { 95 int intarg; 96 u_int uintarg; 97 long longarg; 98 u_long ulongarg; 99 long long longlongarg; 100 unsigned long long ulonglongarg; 101 ptrdiff_t ptrdiffarg; 102 ssize_t ssizearg; 103 size_t sizearg; 104 intmax_t intmaxarg; 105 uintmax_t uintmaxarg; 106 void *pvoidarg; 107 char *pchararg; 108 signed char *pschararg; 109 short *pshortarg; 110 int *pintarg; 111 long *plongarg; 112 long long *plonglongarg; 113 ptrdiff_t *pptrdiffarg; 114 size_t *psizearg; 115 intmax_t *pintmaxarg; 116 #ifndef NO_FLOATING_POINT 117 double doublearg; 118 long double longdoublearg; 119 #endif 120 wint_t wintarg; 121 wchar_t *pwchararg; 122 }; 123 124 /* 125 * Type ids for argument type table. 126 */ 127 enum typeid { 128 T_UNUSED = 0, TP_SHORT, T_INT, T_U_INT, TP_INT, 129 T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG, 130 T_PTRDIFFT, TP_PTRDIFFT, T_SSIZET, T_SIZET, TP_SIZET, 131 T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR, 132 T_DOUBLE, T_LONG_DOUBLE, T_WINT, TP_WCHAR 133 }; 134 135 #ifdef NARROW 136 __printflike(3, 0) 137 #endif 138 static int __sbprintf(FILE *, locale_t, const CHAR_T *, va_list); 139 140 static CHAR_T *__ujtoa(uintmax_t, CHAR_T *, int, int, const char *, int, 141 char, const char *); 142 static CHAR_T *__ultoa(u_long, CHAR_T *, int, int, const char *, int, 143 char, const char *); 144 #ifndef NARROW 145 static CHAR_T *__mbsconv(char *, int, locale_t); 146 static wint_t __xfputwc(CHAR_T, FILE *, locale_t); 147 #else 148 static char *__wcsconv(wchar_t *, int, locale_t); 149 static int __sprint(FILE *, struct __suio *); 150 #endif 151 static int __find_arguments(const CHAR_T *, va_list, union arg **); 152 static int __grow_type_table(size_t, enum typeid **, size_t *); 153 154 /* 155 * Helper function for `fprintf to unbuffered unix file': creates a 156 * temporary buffer. We only work on write-only files; this avoids 157 * worries about ungetc buffers and so forth. 158 */ 159 static int 160 __sbprintf(FILE *fp, locale_t loc, const CHAR_T *fmt, va_list ap) 161 { 162 int ret; 163 FILE fake; 164 struct __sfileext fakeext; 165 unsigned char buf[BUFSIZ]; 166 167 _DIAGASSERT(fp != NULL); 168 _DIAGASSERT(fmt != NULL); 169 170 _FILEEXT_SETUP(&fake, &fakeext); 171 memset(WCIO_GET(&fake), 0, sizeof(struct wchar_io_data)); 172 173 /* copy the important variables */ 174 fake._flags = fp->_flags & ~__SNBF; 175 fake._file = fp->_file; 176 fake._cookie = fp->_cookie; 177 fake._write = fp->_write; 178 fake._flush = fp->_flush; 179 180 /* set up the buffer */ 181 fake._bf._base = fake._p = buf; 182 fake._bf._size = fake._w = sizeof(buf); 183 fake._lbfsize = 0; /* not actually used, but Just In Case */ 184 185 /* do the work, then copy any error status */ 186 ret = WDECL(__vf,printf_unlocked_l)(&fake, loc, fmt, ap); 187 if (ret >= 0 && fflush(&fake)) 188 ret = END_OF_FILE; 189 if (fake._flags & __SERR) 190 fp->_flags |= __SERR; 191 return ret; 192 } 193 194 #ifndef NARROW 195 /* 196 * Like __fputwc, but handles fake string (__SSTR) files properly. 197 * File must already be locked. 198 */ 199 static wint_t 200 __xfputwc(wchar_t wc, FILE *fp, locale_t loc) 201 { 202 static const mbstate_t initial; 203 mbstate_t mbs; 204 char buf[MB_LEN_MAX]; 205 struct __suio uio; 206 struct __siov iov; 207 size_t len; 208 209 if ((fp->_flags & __SSTR) == 0) 210 return __fputwc_unlock(wc, fp); 211 212 mbs = initial; 213 if ((len = wcrtomb_l(buf, wc, &mbs, loc)) == (size_t)-1) { 214 fp->_flags |= __SERR; 215 return END_OF_FILE; 216 } 217 uio.uio_iov = &iov; 218 uio.uio_resid = len; 219 uio.uio_iovcnt = 1; 220 iov.iov_base = buf; 221 iov.iov_len = len; 222 return __sfvwrite(fp, &uio) != EOF ? (wint_t)wc : END_OF_FILE; 223 } 224 #else 225 /* 226 * Flush out all the vectors defined by the given uio, 227 * then reset it so that it can be reused. 228 */ 229 static int 230 __sprint(FILE *fp, struct __suio *uio) 231 { 232 int err; 233 234 _DIAGASSERT(fp != NULL); 235 _DIAGASSERT(uio != NULL); 236 237 if (uio->uio_resid == 0) { 238 uio->uio_iovcnt = 0; 239 return 0; 240 } 241 err = __sfvwrite(fp, uio); 242 uio->uio_resid = 0; 243 uio->uio_iovcnt = 0; 244 return err; 245 } 246 #endif 247 248 /* 249 * Macros for converting digits to letters and vice versa 250 */ 251 #define to_digit(c) ((c) - '0') 252 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 253 #define to_char(n) (CHAR_T)((n) + '0') 254 255 /* 256 * Convert an unsigned long to ASCII for printf purposes, returning 257 * a pointer to the first character of the string representation. 258 * Octal numbers can be forced to have a leading zero; hex numbers 259 * use the given digits. 260 */ 261 static CHAR_T * 262 __ultoa(u_long val, CHAR_T *endp, int base, int octzero, const char *xdigs, 263 int needgrp, char thousep, const char *grp) 264 { 265 CHAR_T *cp = endp; 266 long sval; 267 int ndig; 268 269 /* 270 * Handle the three cases separately, in the hope of getting 271 * better/faster code. 272 */ 273 switch (base) { 274 case 10: 275 if (val < 10) { /* many numbers are 1 digit */ 276 *--cp = to_char(val); 277 return cp; 278 } 279 ndig = 0; 280 /* 281 * On many machines, unsigned arithmetic is harder than 282 * signed arithmetic, so we do at most one unsigned mod and 283 * divide; this is sufficient to reduce the range of 284 * the incoming value to where signed arithmetic works. 285 */ 286 if (val > LONG_MAX) { 287 *--cp = to_char(val % 10); 288 ndig++; 289 sval = val / 10; 290 } else 291 sval = val; 292 do { 293 *--cp = to_char(sval % 10); 294 ndig++; 295 /* 296 * If (*grp == CHAR_MAX) then no more grouping 297 * should be performed. 298 */ 299 if (needgrp && ndig == *grp 300 && (unsigned char)*grp != (unsigned char)CHAR_MAX 301 && sval > 9) { 302 *--cp = thousep; 303 ndig = 0; 304 /* 305 * If (*(grp+1) == '\0') then we have to 306 * use *grp character (last grouping rule) 307 * for all next cases 308 */ 309 if (*(grp+1) != '\0') 310 grp++; 311 } 312 sval /= 10; 313 } while (sval != 0); 314 break; 315 316 case 8: 317 do { 318 *--cp = to_char(val & 7); 319 val >>= 3; 320 } while (val); 321 if (octzero && *cp != '0') 322 *--cp = '0'; 323 break; 324 325 case 16: 326 do { 327 *--cp = xdigs[(size_t)val & 15]; 328 val >>= 4; 329 } while (val); 330 break; 331 332 default: /* oops */ 333 abort(); 334 } 335 return cp; 336 } 337 338 /* Identical to __ultoa, but for intmax_t. */ 339 static CHAR_T * 340 __ujtoa(uintmax_t val, CHAR_T *endp, int base, int octzero, 341 const char *xdigs, int needgrp, char thousep, const char *grp) 342 { 343 CHAR_T *cp = endp; 344 intmax_t sval; 345 int ndig; 346 347 /* quick test for small values; __ultoa is typically much faster */ 348 /* (perhaps instead we should run until small, then call __ultoa?) */ 349 if (val <= ULONG_MAX) 350 return __ultoa((u_long)val, endp, base, octzero, xdigs, 351 needgrp, thousep, grp); 352 switch (base) { 353 case 10: 354 if (val < 10) { 355 *--cp = to_char(val % 10); 356 return cp; 357 } 358 ndig = 0; 359 if (val > INTMAX_MAX) { 360 *--cp = to_char(val % 10); 361 ndig++; 362 sval = val / 10; 363 } else 364 sval = val; 365 do { 366 *--cp = to_char(sval % 10); 367 ndig++; 368 /* 369 * If (*grp == CHAR_MAX) then no more grouping 370 * should be performed. 371 */ 372 if (needgrp 373 && (unsigned char)*grp != (unsigned char)CHAR_MAX 374 && ndig == *grp 375 && sval > 9) { 376 *--cp = thousep; 377 ndig = 0; 378 /* 379 * If (*(grp+1) == '\0') then we have to 380 * use *grp character (last grouping rule) 381 * for all next cases 382 */ 383 if (*(grp+1) != '\0') 384 grp++; 385 } 386 sval /= 10; 387 } while (sval != 0); 388 break; 389 390 case 8: 391 do { 392 *--cp = to_char(val & 7); 393 val >>= 3; 394 } while (val); 395 if (octzero && *cp != '0') 396 *--cp = '0'; 397 break; 398 399 case 16: 400 do { 401 *--cp = xdigs[(size_t)val & 15]; 402 val >>= 4; 403 } while (val); 404 break; 405 406 default: 407 abort(); 408 } 409 return cp; 410 } 411 412 #ifndef NARROW 413 /* 414 * Convert a multibyte character string argument for the %s format to a wide 415 * string representation. ``prec'' specifies the maximum number of bytes 416 * to output. If ``prec'' is greater than or equal to zero, we can't assume 417 * that the multibyte char. string ends in a null character. 418 */ 419 static wchar_t * 420 __mbsconv(char *mbsarg, int prec, locale_t loc) 421 { 422 static const mbstate_t initial; 423 mbstate_t mbs; 424 wchar_t *convbuf, *wcp; 425 const char *p; 426 size_t insize, nchars, nconv; 427 428 if (mbsarg == NULL) 429 return NULL; 430 431 /* 432 * Supplied argument is a multibyte string; convert it to wide 433 * characters first. 434 */ 435 if (prec >= 0) { 436 /* 437 * String is not guaranteed to be NUL-terminated. Find the 438 * number of characters to print. 439 */ 440 p = mbsarg; 441 insize = nchars = nconv = 0; 442 mbs = initial; 443 while (nchars != (size_t)prec) { 444 nconv = mbrlen_l(p, MB_CUR_MAX_L(loc), &mbs, loc); 445 if (nconv == 0 || nconv == (size_t)-1 || 446 nconv == (size_t)-2) 447 break; 448 p += nconv; 449 nchars++; 450 insize += nconv; 451 } 452 if (nconv == (size_t)-1 || nconv == (size_t)-2) 453 return NULL; 454 } else 455 insize = strlen(mbsarg); 456 457 /* 458 * Allocate buffer for the result and perform the conversion, 459 * converting at most `size' bytes of the input multibyte string to 460 * wide characters for printing. 461 */ 462 convbuf = malloc((insize + 1) * sizeof(*convbuf)); 463 if (convbuf == NULL) 464 return NULL; 465 wcp = convbuf; 466 p = mbsarg; 467 mbs = initial; 468 nconv = 0; 469 while (insize != 0) { 470 nconv = mbrtowc_l(wcp, p, insize, &mbs, loc); 471 if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) 472 break; 473 wcp++; 474 p += nconv; 475 insize -= nconv; 476 } 477 if (nconv == (size_t)-1 || nconv == (size_t)-2) { 478 free(convbuf); 479 return NULL; 480 } 481 *wcp = L'\0'; 482 483 return convbuf; 484 } 485 #else 486 /* 487 * Convert a wide-character string argument for the %ls format to a multibyte 488 * string representation. If not -1, prec specifies the maximum number of 489 * bytes to output, and also means that we can't assume that the wide-char. 490 * string ends is null-terminated. 491 */ 492 static char * 493 __wcsconv(wchar_t *wcsarg, int prec, locale_t loc) 494 { 495 static const mbstate_t initial; 496 mbstate_t mbs; 497 char buf[MB_LEN_MAX]; 498 wchar_t *p; 499 char *convbuf; 500 size_t clen, nbytes; 501 502 /* Allocate space for the maximum number of bytes we could output. */ 503 if (prec < 0) { 504 p = wcsarg; 505 mbs = initial; 506 nbytes = wcsrtombs_l(NULL, (void *)&p, 0, &mbs, loc); 507 if (nbytes == (size_t)-1) 508 return NULL; 509 } else { 510 /* 511 * Optimisation: if the output precision is small enough, 512 * just allocate enough memory for the maximum instead of 513 * scanning the string. 514 */ 515 if (prec < 128) 516 nbytes = prec; 517 else { 518 nbytes = 0; 519 p = wcsarg; 520 mbs = initial; 521 for (;;) { 522 clen = wcrtomb_l(buf, *p++, &mbs, loc); 523 if (clen == 0 || clen == (size_t)-1 || 524 nbytes + clen > (size_t)prec) 525 break; 526 nbytes += clen; 527 } 528 } 529 } 530 if ((convbuf = malloc(nbytes + 1)) == NULL) 531 return NULL; 532 533 /* Fill the output buffer. */ 534 p = wcsarg; 535 mbs = initial; 536 if ((nbytes = wcsrtombs_l(convbuf, (void *)&p, 537 nbytes, &mbs, loc)) == (size_t)-1) { 538 free(convbuf); 539 return NULL; 540 } 541 convbuf[nbytes] = '\0'; 542 return convbuf; 543 } 544 #endif 545 546 /* 547 * MT-safe version 548 */ 549 int 550 WDECL(vf,printf)(FILE * __restrict fp, const CHAR_T * __restrict fmt0, va_list ap) 551 { 552 int ret; 553 554 FLOCKFILE(fp); 555 ret = WDECL(__vf,printf_unlocked_l)(fp, _current_locale(), fmt0, ap); 556 FUNLOCKFILE(fp); 557 return ret; 558 } 559 560 int 561 WDECL(vf,printf_l)(FILE * __restrict fp, locale_t loc, const CHAR_T * __restrict fmt0, 562 va_list ap) 563 { 564 int ret; 565 566 FLOCKFILE(fp); 567 ret = WDECL(__vf,printf_unlocked_l)(fp, loc, fmt0, ap); 568 FUNLOCKFILE(fp); 569 return ret; 570 } 571 572 #ifndef NO_FLOATING_POINT 573 574 #include <float.h> 575 #include <math.h> 576 #include "floatio.h" 577 578 #define DEFPREC 6 579 580 static int exponent(CHAR_T *, int, int); 581 #ifndef WIDE_DOUBLE 582 static char *cvt(double, int, int, char *, int *, int, int *); 583 #endif 584 585 #endif /* !NO_FLOATING_POINT */ 586 587 /* 588 * The size of the buffer we use as scratch space for integer 589 * conversions, among other things. Technically, we would need the 590 * most space for base 10 conversions with thousands' grouping 591 * characters between each pair of digits. 100 bytes is a 592 * conservative overestimate even for a 128-bit uintmax_t. 593 */ 594 #define BUF 100 595 596 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 597 598 /* 599 * Flags used during conversion. 600 */ 601 #define ALT 0x001 /* alternate form */ 602 #define LADJUST 0x004 /* left adjustment */ 603 #define LONGDBL 0x008 /* long double */ 604 #define LONGINT 0x010 /* long integer */ 605 #define LLONGINT 0x020 /* long long integer */ 606 #define SHORTINT 0x040 /* short integer */ 607 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 608 #define FPT 0x100 /* Floating point number */ 609 #define GROUPING 0x200 /* use grouping ("'" flag) */ 610 /* C99 additional size modifiers: */ 611 #define SIZET 0x400 /* size_t */ 612 #define PTRDIFFT 0x800 /* ptrdiff_t */ 613 #define INTMAXT 0x1000 /* intmax_t */ 614 #define CHARINT 0x2000 /* print char using int format */ 615 616 /* 617 * Non-MT-safe version 618 */ 619 int 620 WDECL(__vf,printf_unlocked_l)(FILE *fp, locale_t loc, const CHAR_T *fmt0, va_list ap) 621 { 622 CHAR_T *fmt; /* format string */ 623 int ch; /* character from fmt */ 624 int n, n2; /* handy integer (short term usage) */ 625 CHAR_T *cp; /* handy char pointer (short term usage) */ 626 int flags; /* flags as above */ 627 int ret; /* return value accumulator */ 628 int width; /* width from format (%8d), or 0 */ 629 int prec; /* precision from format; <0 for N/A */ 630 CHAR_T sign; /* sign prefix (' ', '+', '-', or \0) */ 631 char thousands_sep; /* locale specific thousands separator */ 632 const char *grouping; /* locale specific numeric grouping rules */ 633 #ifndef NO_FLOATING_POINT 634 /* 635 * We can decompose the printed representation of floating 636 * point numbers into several parts, some of which may be empty: 637 * 638 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ 639 * A B ---C--- D E F 640 * 641 * A: 'sign' holds this value if present; '\0' otherwise 642 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal 643 * C: cp points to the string MMMNNN. Leading and trailing 644 * zeros are not in the string and must be added. 645 * D: expchar holds this character; '\0' if no exponent, e.g. %f 646 * F: at least two digits for decimal, at least one digit for hex 647 */ 648 char *decimal_point; /* locale specific decimal point */ 649 #ifdef WIDE_DOUBLE 650 int signflag; /* true if float is negative */ 651 union { /* floating point arguments %[aAeEfFgG] */ 652 double dbl; 653 long double ldbl; 654 } fparg; 655 char *dtoaend; /* pointer to end of converted digits */ 656 #else 657 double _double; /* double precision arguments %[eEfgG] */ 658 char softsign; /* temporary negative sign for floats */ 659 #endif 660 char *dtoaresult; /* buffer allocated by dtoa */ 661 int expt; /* integer value of exponent */ 662 char expchar; /* exponent character: [eEpP\0] */ 663 int expsize; /* character count for expstr */ 664 int lead; /* sig figs before decimal or group sep */ 665 int ndig; /* actual number of digits returned by dtoa */ 666 CHAR_T expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ 667 int nseps; /* number of group separators with ' */ 668 int nrepeats; /* number of repeats of the last group */ 669 #endif 670 u_long ulval; /* integer arguments %[diouxX] */ 671 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */ 672 int base; /* base for [diouxX] conversion */ 673 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 674 int realsz; /* field size expanded by dprec, sign, etc */ 675 int size; /* size of converted field or string */ 676 int prsize; /* max size of printed field */ 677 const char *xdigs; /* digits for %[xX] conversion */ 678 #ifdef NARROW 679 #define NIOV 8 680 struct __siov *iovp; /* for PRINT macro */ 681 struct __suio uio; /* output information: summary */ 682 struct __siov iov[NIOV];/* ... and individual io vectors */ 683 #else 684 int n3; 685 #endif 686 CHAR_T buf[BUF]; /* buffer with space for digits of uintmax_t */ 687 CHAR_T ox[2]; /* space for 0x hex-prefix */ 688 union arg *argtable; /* args, built due to positional arg */ 689 union arg statargtable [STATIC_ARG_TBL_SIZE]; 690 int nextarg; /* 1-based argument index */ 691 va_list orgap; /* original argument pointer */ 692 CHAR_T *convbuf; /* multibyte to wide conversion result */ 693 694 /* 695 * Choose PADSIZE to trade efficiency vs. size. If larger printf 696 * fields occur frequently, increase PADSIZE and make the initialisers 697 * below longer. 698 */ 699 #define PADSIZE 16 /* pad chunk size */ 700 static CHAR_T blanks[PADSIZE] = 701 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 702 static CHAR_T zeroes[PADSIZE] = 703 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 704 705 static const char xdigs_lower[16] = "0123456789abcdef"; 706 static const char xdigs_upper[16] = "0123456789ABCDEF"; 707 708 /* 709 * BEWARE, these `goto error' on error, PRINT uses `n2' and 710 * PAD uses `n'. 711 */ 712 #ifndef NARROW 713 #define PRINT(ptr, len) do { \ 714 for (n3 = 0; n3 < (len); n3++) \ 715 __xfputwc((ptr)[n3], fp, loc); \ 716 } while (/*CONSTCOND*/0) 717 #define FLUSH() 718 #else 719 #define PRINT(ptr, len) do { \ 720 iovp->iov_base = __UNCONST(ptr); \ 721 iovp->iov_len = (len); \ 722 uio.uio_resid += (len); \ 723 iovp++; \ 724 if (++uio.uio_iovcnt >= NIOV) { \ 725 if (__sprint(fp, &uio)) \ 726 goto error; \ 727 iovp = iov; \ 728 } \ 729 } while (/*CONSTCOND*/0) 730 #define FLUSH() do { \ 731 if (uio.uio_resid && __sprint(fp, &uio)) \ 732 goto error; \ 733 uio.uio_iovcnt = 0; \ 734 iovp = iov; \ 735 } while (/*CONSTCOND*/0) 736 #endif /* NARROW */ 737 738 #define PAD(howmany, with) do { \ 739 if ((n = (howmany)) > 0) { \ 740 while (n > PADSIZE) { \ 741 PRINT(with, PADSIZE); \ 742 n -= PADSIZE; \ 743 } \ 744 PRINT(with, n); \ 745 } \ 746 } while (/*CONSTCOND*/0) 747 #define PRINTANDPAD(p, ep, len, with) do { \ 748 ptrdiff_t td = (ep) - (p); \ 749 _DIAGASSERT(__type_fit(int, td)); \ 750 n2 = (int)td; \ 751 if (n2 > (len)) \ 752 n2 = (len); \ 753 if (n2 > 0) \ 754 PRINT((p), n2); \ 755 PAD((len) - (n2 > 0 ? n2 : 0), (with)); \ 756 } while(/*CONSTCOND*/0) 757 758 /* 759 * Get the argument indexed by nextarg. If the argument table is 760 * built, use it to get the argument. If its not, get the next 761 * argument (and arguments must be gotten sequentially). 762 */ 763 #define GETARG(type) \ 764 ((/*CONSTCOND*/argtable != NULL) ? *((type*)(void*)(&argtable[nextarg++])) : \ 765 (nextarg++, va_arg(ap, type))) 766 767 /* 768 * To extend shorts properly, we need both signed and unsigned 769 * argument extraction methods. 770 */ 771 #define SARG() \ 772 (flags&LONGINT ? GETARG(long) : \ 773 flags&SHORTINT ? (long)(short)GETARG(int) : \ 774 flags&CHARINT ? (long)(signed char)GETARG(int) : \ 775 (long)GETARG(int)) 776 #define UARG() \ 777 (flags&LONGINT ? GETARG(u_long) : \ 778 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 779 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \ 780 (u_long)GETARG(u_int)) 781 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT) 782 #define SJARG() \ 783 (flags&INTMAXT ? GETARG(intmax_t) : \ 784 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \ 785 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \ 786 (intmax_t)GETARG(long long)) 787 #define UJARG() \ 788 (flags&INTMAXT ? GETARG(uintmax_t) : \ 789 flags&SIZET ? (uintmax_t)GETARG(size_t) : \ 790 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \ 791 (uintmax_t)GETARG(unsigned long long)) 792 793 /* 794 * Get * arguments, including the form *nn$. Preserve the nextarg 795 * that the argument can be gotten once the type is determined. 796 */ 797 #define GETASTER(val) \ 798 n2 = 0; \ 799 cp = fmt; \ 800 while (is_digit(*cp)) { \ 801 n2 = 10 * n2 + to_digit(*cp); \ 802 cp++; \ 803 } \ 804 if (*cp == '$') { \ 805 int hold = nextarg; \ 806 if (argtable == NULL) { \ 807 argtable = statargtable; \ 808 if (__find_arguments(fmt0, orgap, &argtable) == -1) \ 809 goto oomem; \ 810 } \ 811 nextarg = n2; \ 812 val = GETARG (int); \ 813 nextarg = hold; \ 814 fmt = ++cp; \ 815 } else { \ 816 val = GETARG (int); \ 817 } 818 819 _DIAGASSERT(fp != NULL); 820 _DIAGASSERT(fmt0 != NULL); 821 822 _SET_ORIENTATION(fp, -1); 823 824 ndig = -1; /* XXX gcc */ 825 826 thousands_sep = '\0'; 827 grouping = NULL; 828 #ifndef NO_FLOATING_POINT 829 decimal_point = localeconv_l(loc)->decimal_point; 830 expsize = 0; /* XXXGCC -Wuninitialized [sh3,m68000] */ 831 #endif 832 convbuf = NULL; 833 /* sorry, f{w,}printf(read_only_file, L"") returns {W,}EOF, not 0 */ 834 if (cantwrite(fp)) { 835 errno = EBADF; 836 return END_OF_FILE; 837 } 838 839 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 840 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 841 __sfileno(fp) != -1) 842 return __sbprintf(fp, loc, fmt0, ap); 843 844 fmt = (CHAR_T *)__UNCONST(fmt0); 845 argtable = NULL; 846 nextarg = 1; 847 va_copy(orgap, ap); 848 #ifdef NARROW 849 uio.uio_iov = iovp = iov; 850 uio.uio_resid = 0; 851 uio.uio_iovcnt = 0; 852 #endif 853 ret = 0; 854 855 /* 856 * Scan the format for conversions (`%' character). 857 */ 858 for (;;) { 859 const CHAR_T *result; 860 861 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 862 continue; 863 _DIAGASSERT(__type_fit(int, fmt - cp)); 864 if ((n = (int)(fmt - cp)) != 0) { 865 if ((unsigned)ret + n > INT_MAX) { 866 ret = END_OF_FILE; 867 goto error; 868 } 869 PRINT(cp, n); 870 ret += n; 871 } 872 if (ch == '\0') 873 goto done; 874 fmt++; /* skip over '%' */ 875 876 flags = 0; 877 dprec = 0; 878 width = 0; 879 prec = -1; 880 sign = '\0'; 881 ox[1] = '\0'; 882 expchar = '\0'; 883 lead = 0; 884 nseps = nrepeats = 0; 885 ulval = 0; 886 ujval = 0; 887 xdigs = NULL; 888 889 rflag: ch = *fmt++; 890 reswitch: switch (ch) { 891 case ' ': 892 /*- 893 * ``If the space and + flags both appear, the space 894 * flag will be ignored.'' 895 * -- ANSI X3J11 896 */ 897 if (!sign) 898 sign = ' '; 899 goto rflag; 900 case '#': 901 flags |= ALT; 902 goto rflag; 903 case '*': 904 /*- 905 * ``A negative field width argument is taken as a 906 * - flag followed by a positive field width.'' 907 * -- ANSI X3J11 908 * They don't exclude field widths read from args. 909 */ 910 GETASTER (width); 911 if (width >= 0) 912 goto rflag; 913 width = -width; 914 /* FALLTHROUGH */ 915 case '-': 916 flags |= LADJUST; 917 goto rflag; 918 case '+': 919 sign = '+'; 920 goto rflag; 921 case '\'': 922 flags |= GROUPING; 923 thousands_sep = *(localeconv_l(loc)->thousands_sep); 924 grouping = localeconv_l(loc)->grouping; 925 /* If the locale doesn't define the above, use sane 926 * defaults - otherwise silly things happen! */ 927 if (thousands_sep == 0) 928 thousands_sep = ','; 929 if (!grouping || !*grouping) 930 grouping = "\3"; 931 goto rflag; 932 case '.': 933 if ((ch = *fmt++) == '*') { 934 GETASTER (prec); 935 goto rflag; 936 } 937 prec = 0; 938 while (is_digit(ch)) { 939 prec = 10 * prec + to_digit(ch); 940 ch = *fmt++; 941 } 942 goto reswitch; 943 case '0': 944 /*- 945 * ``Note that 0 is taken as a flag, not as the 946 * beginning of a field width.'' 947 * -- ANSI X3J11 948 */ 949 flags |= ZEROPAD; 950 goto rflag; 951 case '1': case '2': case '3': case '4': 952 case '5': case '6': case '7': case '8': case '9': 953 n = 0; 954 do { 955 n = 10 * n + to_digit(ch); 956 ch = *fmt++; 957 } while (is_digit(ch)); 958 if (ch == '$') { 959 nextarg = n; 960 if (argtable == NULL) { 961 argtable = statargtable; 962 if (__find_arguments(fmt0, orgap, 963 &argtable) == -1) 964 goto oomem; 965 } 966 goto rflag; 967 } 968 width = n; 969 goto reswitch; 970 #ifndef NO_FLOATING_POINT 971 case 'L': 972 flags |= LONGDBL; 973 goto rflag; 974 #endif 975 case 'h': 976 if (flags & SHORTINT) { 977 flags &= ~SHORTINT; 978 flags |= CHARINT; 979 } else 980 flags |= SHORTINT; 981 goto rflag; 982 case 'j': 983 flags |= INTMAXT; 984 goto rflag; 985 case 'l': 986 if (flags & LONGINT) { 987 flags &= ~LONGINT; 988 flags |= LLONGINT; 989 } else 990 flags |= LONGINT; 991 goto rflag; 992 case 'q': 993 flags |= LLONGINT; /* not necessarily */ 994 goto rflag; 995 case 't': 996 flags |= PTRDIFFT; 997 goto rflag; 998 case 'z': 999 flags |= SIZET; 1000 goto rflag; 1001 case 'C': 1002 flags |= LONGINT; 1003 /*FALLTHROUGH*/ 1004 case 'c': 1005 #ifdef NARROW 1006 if (flags & LONGINT) { 1007 static const mbstate_t initial; 1008 mbstate_t mbs; 1009 size_t mbseqlen; 1010 1011 mbs = initial; 1012 mbseqlen = wcrtomb_l(buf, 1013 (wchar_t)GETARG(wint_t), &mbs, loc); 1014 if (mbseqlen == (size_t)-1) { 1015 fp->_flags |= __SERR; 1016 goto error; 1017 } 1018 size = (int)mbseqlen; 1019 } else { 1020 *buf = GETARG(int); 1021 size = 1; 1022 } 1023 #else 1024 if (flags & LONGINT) 1025 *buf = (wchar_t)GETARG(wint_t); 1026 else 1027 *buf = (wchar_t)btowc_l(GETARG(int), loc); 1028 size = 1; 1029 #endif 1030 result = buf; 1031 sign = '\0'; 1032 break; 1033 case 'D': 1034 flags |= LONGINT; 1035 /*FALLTHROUGH*/ 1036 case 'd': 1037 case 'i': 1038 if (flags & INTMAX_SIZE) { 1039 ujval = SJARG(); 1040 if ((intmax_t)ujval < 0) { 1041 ujval = -ujval; 1042 sign = '-'; 1043 } 1044 } else { 1045 ulval = SARG(); 1046 if ((long)ulval < 0) { 1047 ulval = -ulval; 1048 sign = '-'; 1049 } 1050 } 1051 base = 10; 1052 goto number; 1053 #ifndef NO_FLOATING_POINT 1054 #ifdef WIDE_DOUBLE 1055 case 'a': 1056 case 'A': 1057 if (ch == 'a') { 1058 ox[1] = 'x'; 1059 xdigs = xdigs_lower; 1060 expchar = 'p'; 1061 } else { 1062 ox[1] = 'X'; 1063 xdigs = xdigs_upper; 1064 expchar = 'P'; 1065 } 1066 if (prec >= 0) 1067 prec++; 1068 if (flags & LONGDBL) { 1069 fparg.ldbl = GETARG(long double); 1070 dtoaresult = 1071 __hldtoa(fparg.ldbl, xdigs, prec, 1072 &expt, &signflag, &dtoaend); 1073 } else { 1074 fparg.dbl = GETARG(double); 1075 dtoaresult = 1076 __hdtoa(fparg.dbl, xdigs, prec, 1077 &expt, &signflag, &dtoaend); 1078 } 1079 if (dtoaresult == NULL) 1080 goto oomem; 1081 1082 if (prec < 0) { 1083 _DIAGASSERT(__type_fit(int, 1084 dtoaend - dtoaresult)); 1085 prec = (int)(dtoaend - dtoaresult); 1086 } 1087 if (expt == INT_MAX) 1088 ox[1] = '\0'; 1089 _DIAGASSERT(__type_fit(int, dtoaend - dtoaresult)); 1090 ndig = (int)(dtoaend - dtoaresult); 1091 if (convbuf != NULL) 1092 free(convbuf); 1093 #ifndef NARROW 1094 result = convbuf = __mbsconv(dtoaresult, -1, loc); 1095 #else 1096 /*XXX inefficient*/ 1097 result = convbuf = strdup(dtoaresult); 1098 #endif 1099 if (result == NULL) 1100 goto oomem; 1101 __freedtoa(dtoaresult); 1102 goto fp_common; 1103 case 'e': 1104 case 'E': 1105 expchar = ch; 1106 if (prec < 0) /* account for digit before decpt */ 1107 prec = DEFPREC + 1; 1108 else 1109 prec++; 1110 goto fp_begin; 1111 case 'f': 1112 case 'F': 1113 expchar = '\0'; 1114 goto fp_begin; 1115 case 'g': 1116 case 'G': 1117 expchar = ch - ('g' - 'e'); 1118 if (prec == 0) 1119 prec = 1; 1120 fp_begin: 1121 if (prec < 0) 1122 prec = DEFPREC; 1123 if (flags & LONGDBL) { 1124 fparg.ldbl = GETARG(long double); 1125 dtoaresult = 1126 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, 1127 &expt, &signflag, &dtoaend); 1128 } else { 1129 fparg.dbl = GETARG(double); 1130 dtoaresult = 1131 __dtoa(fparg.dbl, expchar ? 2 : 3, prec, 1132 &expt, &signflag, &dtoaend); 1133 if (expt == 9999) 1134 expt = INT_MAX; 1135 } 1136 if (dtoaresult == NULL) 1137 goto oomem; 1138 _DIAGASSERT(__type_fit(int, dtoaend - dtoaresult)); 1139 ndig = (int)(dtoaend - dtoaresult); 1140 if (convbuf != NULL) 1141 free(convbuf); 1142 #ifndef NARROW 1143 result = convbuf = __mbsconv(dtoaresult, -1, loc); 1144 #else 1145 /*XXX inefficient*/ 1146 result = convbuf = strdup(dtoaresult); 1147 #endif 1148 if (result == NULL) 1149 goto oomem; 1150 __freedtoa(dtoaresult); 1151 fp_common: 1152 if (signflag) 1153 sign = '-'; 1154 if (expt == INT_MAX) { /* inf or nan */ 1155 if (*result == 'N') { 1156 result = (ch >= 'a') ? STRCONST("nan") : 1157 STRCONST("NAN"); 1158 sign = '\0'; 1159 } else 1160 result = (ch >= 'a') ? STRCONST("inf") : 1161 STRCONST("INF"); 1162 size = 3; 1163 flags &= ~ZEROPAD; 1164 break; 1165 } 1166 #else 1167 case 'e': 1168 case 'E': 1169 case 'f': 1170 case 'F': 1171 case 'g': 1172 case 'G': 1173 if (prec == -1) { 1174 prec = DEFPREC; 1175 } else if ((ch == 'g' || ch == 'G') && prec == 0) { 1176 prec = 1; 1177 } 1178 1179 if (flags & LONGDBL) { 1180 _double = (double) GETARG(long double); 1181 } else { 1182 _double = GETARG(double); 1183 } 1184 1185 /* do this before tricky precision changes */ 1186 if (isinf(_double)) { 1187 if (_double < 0) 1188 sign = '-'; 1189 if (ch == 'E' || ch == 'F' || ch == 'G') 1190 result = STRCONST("INF"); 1191 else 1192 result = STRCONST("inf"); 1193 size = 3; 1194 flags &= ~ZEROPAD; 1195 break; 1196 } 1197 if (isnan(_double)) { 1198 if (ch == 'E' || ch == 'F' || ch == 'G') 1199 result = STRCONST("NAN"); 1200 else 1201 result = STRCONST("nan"); 1202 size = 3; 1203 flags &= ~ZEROPAD; 1204 break; 1205 } 1206 1207 flags |= FPT; 1208 dtoaresult = cvt(_double, prec, flags, &softsign, 1209 &expt, ch, &ndig); 1210 if (dtoaresult == NULL) 1211 goto oomem; 1212 if (convbuf != NULL) 1213 free(convbuf); 1214 #ifndef NARROW 1215 result = convbuf = __mbsconv(dtoaresult, -1, loc); 1216 #else 1217 /*XXX inefficient*/ 1218 result = convbuf = strdup(dtoaresult); 1219 #endif 1220 if (result == NULL) 1221 goto oomem; 1222 __freedtoa(dtoaresult); 1223 if (softsign) 1224 sign = '-'; 1225 #endif 1226 flags |= FPT; 1227 if (ch == 'g' || ch == 'G') { 1228 if (expt > -4 && expt <= prec) { 1229 /* Make %[gG] smell like %[fF] */ 1230 expchar = '\0'; 1231 if (flags & ALT) 1232 prec -= expt; 1233 else 1234 prec = ndig - expt; 1235 if (prec < 0) 1236 prec = 0; 1237 } else { 1238 /* 1239 * Make %[gG] smell like %[eE], but 1240 * trim trailing zeroes if no # flag. 1241 */ 1242 if (!(flags & ALT)) 1243 prec = ndig; 1244 } 1245 } 1246 if (expchar) { 1247 expsize = exponent(expstr, expt - 1, expchar); 1248 size = expsize + prec; 1249 if (prec > 1 || flags & ALT) 1250 ++size; 1251 } else { 1252 /* space for digits before decimal point */ 1253 if (expt > 0) 1254 size = expt; 1255 else /* "0" */ 1256 size = 1; 1257 /* space for decimal pt and following digits */ 1258 if (prec || flags & ALT) 1259 size += prec + 1; 1260 if (grouping && expt > 0) { 1261 /* space for thousands' grouping */ 1262 nseps = nrepeats = 0; 1263 lead = expt; 1264 while ((unsigned char)*grouping 1265 != (unsigned char)CHAR_MAX) { 1266 if (lead <= *grouping) 1267 break; 1268 lead -= *grouping; 1269 if (*(grouping+1)) { 1270 nseps++; 1271 grouping++; 1272 } else 1273 nrepeats++; 1274 } 1275 size += nseps + nrepeats; 1276 } else 1277 lead = expt; 1278 } 1279 break; 1280 #endif /* !NO_FLOATING_POINT */ 1281 case 'n': 1282 /* 1283 * Assignment-like behavior is specified if the 1284 * value overflows or is otherwise unrepresentable. 1285 * C99 says to use `signed char' for %hhn conversions. 1286 */ 1287 if (flags & LLONGINT) 1288 *GETARG(long long *) = ret; 1289 else if (flags & SIZET) 1290 *GETARG(ssize_t *) = (ssize_t)ret; 1291 else if (flags & PTRDIFFT) 1292 *GETARG(ptrdiff_t *) = ret; 1293 else if (flags & INTMAXT) 1294 *GETARG(intmax_t *) = ret; 1295 else if (flags & LONGINT) 1296 *GETARG(long *) = ret; 1297 else if (flags & SHORTINT) 1298 *GETARG(short *) = ret; 1299 else if (flags & CHARINT) 1300 *GETARG(signed char *) = ret; 1301 else 1302 *GETARG(int *) = ret; 1303 continue; /* no output */ 1304 case 'O': 1305 flags |= LONGINT; 1306 /*FALLTHROUGH*/ 1307 case 'o': 1308 if (flags & INTMAX_SIZE) 1309 ujval = UJARG(); 1310 else 1311 ulval = UARG(); 1312 base = 8; 1313 goto nosign; 1314 case 'p': 1315 /*- 1316 * ``The argument shall be a pointer to void. The 1317 * value of the pointer is converted to a sequence 1318 * of printable characters, in an implementation- 1319 * defined manner.'' 1320 * -- ANSI X3J11 1321 */ 1322 ujval = (uintmax_t)(uintptr_t)GETARG(void *); 1323 base = 16; 1324 xdigs = xdigs_lower; 1325 flags = flags | INTMAXT; 1326 ox[1] = 'x'; 1327 goto nosign; 1328 case 'S': 1329 flags |= LONGINT; 1330 /*FALLTHROUGH*/ 1331 case 's': 1332 if ((flags & LONGINT) != MULTI) { 1333 if ((result = GETARG(CHAR_T *)) == NULL) 1334 result = STRCONST("(null)"); 1335 } else { 1336 MCHAR_T *mc; 1337 1338 if (convbuf != NULL) 1339 free(convbuf); 1340 if ((mc = GETARG(MCHAR_T *)) == NULL) 1341 result = STRCONST("(null)"); 1342 else { 1343 convbuf = SCONV(mc, prec, loc); 1344 if (convbuf == NULL) { 1345 fp->_flags |= __SERR; 1346 goto error; 1347 } 1348 result = convbuf; 1349 } 1350 } 1351 1352 if (prec >= 0) { 1353 /* 1354 * can't use STRLEN; can only look for the 1355 * NUL in the first `prec' characters, and 1356 * STRLEN() will go further. 1357 */ 1358 CHAR_T *p = MEMCHR(result, 0, (size_t)prec); 1359 1360 if (p != NULL) { 1361 _DIAGASSERT(__type_fit(int, 1362 p - result)); 1363 size = (int)(p - result); 1364 if (size > prec) 1365 size = prec; 1366 } else 1367 size = prec; 1368 } else { 1369 size_t rlen = STRLEN(result); 1370 _DIAGASSERT(__type_fit(int, rlen)); 1371 size = (int)rlen; 1372 } 1373 sign = '\0'; 1374 break; 1375 case 'U': 1376 flags |= LONGINT; 1377 /*FALLTHROUGH*/ 1378 case 'u': 1379 if (flags & INTMAX_SIZE) 1380 ujval = UJARG(); 1381 else 1382 ulval = UARG(); 1383 base = 10; 1384 goto nosign; 1385 case 'X': 1386 xdigs = xdigs_upper; 1387 goto hex; 1388 case 'x': 1389 xdigs = xdigs_lower; 1390 hex: 1391 if (flags & INTMAX_SIZE) 1392 ujval = UJARG(); 1393 else 1394 ulval = UARG(); 1395 base = 16; 1396 /* leading 0x/X only if non-zero */ 1397 if (flags & ALT && 1398 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0)) 1399 ox[1] = ch; 1400 1401 flags &= ~GROUPING; 1402 /* unsigned conversions */ 1403 nosign: sign = '\0'; 1404 /*- 1405 * ``... diouXx conversions ... if a precision is 1406 * specified, the 0 flag will be ignored.'' 1407 * -- ANSI X3J11 1408 */ 1409 number: if ((dprec = prec) >= 0) 1410 flags &= ~ZEROPAD; 1411 1412 /*- 1413 * ``The result of converting a zero value with an 1414 * explicit precision of zero is no characters.'' 1415 * -- ANSI X3J11 1416 * 1417 * ``The C Standard is clear enough as is. The call 1418 * printf("%#.0o", 0) should print 0.'' 1419 * -- Defect Report #151 1420 */ 1421 result = cp = buf + BUF; 1422 if (flags & INTMAX_SIZE) { 1423 if (ujval != 0 || prec != 0 || 1424 (flags & ALT && base == 8)) 1425 result = __ujtoa(ujval, cp, base, 1426 flags & ALT, xdigs, 1427 flags & GROUPING, thousands_sep, 1428 grouping); 1429 } else { 1430 if (ulval != 0 || prec != 0 || 1431 (flags & ALT && base == 8)) 1432 result = __ultoa(ulval, cp, base, 1433 flags & ALT, xdigs, 1434 flags & GROUPING, thousands_sep, 1435 grouping); 1436 } 1437 _DIAGASSERT(__type_fit(int, buf + BUF - result)); 1438 size = (int)(buf + BUF - result); 1439 if (size > BUF) /* should never happen */ 1440 abort(); 1441 break; 1442 default: /* "%?" prints ?, unless ? is NUL */ 1443 if (ch == '\0') 1444 goto done; 1445 /* pretend it was %c with argument ch */ 1446 *buf = ch; 1447 result = buf; 1448 size = 1; 1449 sign = '\0'; 1450 break; 1451 } 1452 1453 /* 1454 * All reasonable formats wind up here. At this point, `result' 1455 * points to a string which (if not flags&LADJUST) should be 1456 * padded out to `width' places. If flags&ZEROPAD, it should 1457 * first be prefixed by any sign or other prefix; otherwise, 1458 * it should be blank padded before the prefix is emitted. 1459 * After any left-hand padding and prefixing, emit zeroes 1460 * required by a decimal [diouxX] precision, then print the 1461 * string proper, then emit zeroes required by any leftover 1462 * floating precision; finally, if LADJUST, pad with blanks. 1463 * 1464 * Compute actual size, so we know how much to pad. 1465 * size excludes decimal prec; realsz includes it. 1466 */ 1467 realsz = dprec > size ? dprec : size; 1468 if (sign) 1469 realsz++; 1470 if (ox[1]) 1471 realsz += 2; 1472 1473 prsize = width > realsz ? width : realsz; 1474 if ((unsigned)ret + prsize > INT_MAX) { 1475 ret = END_OF_FILE; 1476 goto error; 1477 } 1478 1479 /* right-adjusting blank padding */ 1480 if ((flags & (LADJUST|ZEROPAD)) == 0) 1481 PAD(width - realsz, blanks); 1482 1483 /* prefix */ 1484 if (sign) 1485 PRINT(&sign, 1); 1486 1487 if (ox[1]) { /* ox[1] is either x, X, or \0 */ 1488 ox[0] = '0'; 1489 PRINT(ox, 2); 1490 } 1491 1492 /* right-adjusting zero padding */ 1493 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 1494 PAD(width - realsz, zeroes); 1495 1496 /* leading zeroes from decimal precision */ 1497 PAD(dprec - size, zeroes); 1498 1499 /* the string or number proper */ 1500 #ifndef NO_FLOATING_POINT 1501 if ((flags & FPT) == 0) { 1502 PRINT(result, size); 1503 } else { /* glue together f_p fragments */ 1504 if (!expchar) { /* %[fF] or sufficiently short %[gG] */ 1505 if (expt <= 0) { 1506 PRINT(zeroes, 1); 1507 if (prec || flags & ALT) 1508 PRINT(decimal_point, 1); 1509 PAD(-expt, zeroes); 1510 /* already handled initial 0's */ 1511 prec += expt; 1512 } else { 1513 PRINTANDPAD(result, convbuf + ndig, 1514 lead, zeroes); 1515 result += lead; 1516 if (grouping) { 1517 while (nseps>0 || nrepeats>0) { 1518 if (nrepeats > 0) 1519 nrepeats--; 1520 else { 1521 grouping--; 1522 nseps--; 1523 } 1524 PRINT(&thousands_sep, 1525 1); 1526 PRINTANDPAD(result, 1527 convbuf + ndig, 1528 *grouping, zeroes); 1529 result += *grouping; 1530 } 1531 if (result > convbuf + ndig) 1532 result = convbuf + ndig; 1533 } 1534 if (prec || flags & ALT) { 1535 buf[0] = *decimal_point; 1536 PRINT(buf, 1); 1537 } 1538 } 1539 PRINTANDPAD(result, convbuf + ndig, prec, 1540 zeroes); 1541 } else { /* %[eE] or sufficiently long %[gG] */ 1542 if (prec > 1 || flags & ALT) { 1543 buf[0] = *result++; 1544 buf[1] = *decimal_point; 1545 PRINT(buf, 2); 1546 PRINT(result, ndig-1); 1547 PAD(prec - ndig, zeroes); 1548 } else /* XeYYY */ 1549 PRINT(result, 1); 1550 PRINT(expstr, expsize); 1551 } 1552 } 1553 #else 1554 PRINT(result, size); 1555 #endif 1556 /* left-adjusting padding (always blank) */ 1557 if (flags & LADJUST) 1558 PAD(width - realsz, blanks); 1559 1560 /* finally, adjust ret */ 1561 ret += prsize; 1562 FLUSH(); 1563 } 1564 done: 1565 FLUSH(); 1566 error: 1567 va_end(orgap); 1568 if (convbuf != NULL) 1569 free(convbuf); 1570 if (__sferror(fp)) 1571 ret = END_OF_FILE; 1572 if ((argtable != NULL) && (argtable != statargtable)) 1573 free (argtable); 1574 return ret; 1575 /* NOTREACHED */ 1576 oomem: 1577 errno = ENOMEM; 1578 ret = END_OF_FILE; 1579 goto error; 1580 } 1581 1582 /* 1583 * Find all arguments when a positional parameter is encountered. Returns a 1584 * table, indexed by argument number, of pointers to each arguments. The 1585 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 1586 * It will be replaces with a malloc-ed one if it overflows. 1587 */ 1588 static int 1589 __find_arguments(const CHAR_T *fmt0, va_list ap, union arg **argtable) 1590 { 1591 CHAR_T *fmt; /* format string */ 1592 int ch; /* character from fmt */ 1593 size_t n, n2; /* handy index (short term usage) */ 1594 CHAR_T *cp; /* handy char pointer (short term usage) */ 1595 int flags; /* flags as above */ 1596 enum typeid *typetable; /* table of types */ 1597 enum typeid stattypetable [STATIC_ARG_TBL_SIZE]; 1598 size_t tablesize; /* current size of type table */ 1599 size_t tablemax; /* largest used index in table */ 1600 size_t nextarg; /* 1-based argument index */ 1601 size_t nitems; /* number of items we picked from the stack */ 1602 1603 /* 1604 * Add an argument type to the table, expanding if necessary. 1605 * Check for overflow. 1606 */ 1607 #define ADDTYPE(type) \ 1608 do { \ 1609 if (nextarg > SIZE_MAX / sizeof(**argtable)) { \ 1610 if (typetable != stattypetable) \ 1611 free(typetable); \ 1612 return -1; \ 1613 } \ 1614 if (nextarg >= tablesize) \ 1615 if (__grow_type_table(nextarg, &typetable, \ 1616 &tablesize) == -1) \ 1617 return -1; \ 1618 if (nextarg > tablemax) \ 1619 tablemax = nextarg; \ 1620 typetable[nextarg++] = type; \ 1621 nitems++; \ 1622 } while (/*CONSTCOND*/0) 1623 1624 #define ADDSARG() \ 1625 do { \ 1626 if (flags & INTMAXT) \ 1627 ADDTYPE(T_INTMAXT); \ 1628 else if (flags & SIZET) \ 1629 ADDTYPE(T_SSIZET); \ 1630 else if (flags & PTRDIFFT) \ 1631 ADDTYPE(T_PTRDIFFT); \ 1632 else if (flags & LLONGINT) \ 1633 ADDTYPE(T_LLONG); \ 1634 else if (flags & LONGINT) \ 1635 ADDTYPE(T_LONG); \ 1636 else \ 1637 ADDTYPE(T_INT); \ 1638 } while (/*CONSTCOND*/0) 1639 1640 #define ADDUARG() \ 1641 do { \ 1642 if (flags & INTMAXT) \ 1643 ADDTYPE(T_UINTMAXT); \ 1644 else if (flags & SIZET) \ 1645 ADDTYPE(T_SIZET); \ 1646 else if (flags & PTRDIFFT) \ 1647 ADDTYPE(T_PTRDIFFT); \ 1648 else if (flags & LLONGINT) \ 1649 ADDTYPE(T_U_LLONG); \ 1650 else if (flags & LONGINT) \ 1651 ADDTYPE(T_U_LONG); \ 1652 else \ 1653 ADDTYPE(T_U_INT); \ 1654 } while (/*CONSTCOND*/0) 1655 /* 1656 * Add * arguments to the type array. 1657 */ 1658 #define ADDASTER() \ 1659 n2 = 0; \ 1660 cp = fmt; \ 1661 while (is_digit(*cp)) { \ 1662 n2 = 10 * n2 + to_digit(*cp); \ 1663 cp++; \ 1664 } \ 1665 if (*cp == '$') { \ 1666 size_t hold = nextarg; \ 1667 nextarg = n2; \ 1668 ADDTYPE(T_INT); \ 1669 nextarg = hold; \ 1670 fmt = ++cp; \ 1671 } else { \ 1672 ADDTYPE(T_INT); \ 1673 } 1674 fmt = (CHAR_T *)__UNCONST(fmt0); 1675 memset(stattypetable, 0, sizeof(stattypetable)); 1676 typetable = stattypetable; 1677 tablesize = STATIC_ARG_TBL_SIZE; 1678 tablemax = 0; 1679 nextarg = 1; 1680 nitems = 1; 1681 1682 /* 1683 * Scan the format for conversions (`%' character). 1684 */ 1685 for (;;) { 1686 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 1687 /* void */; 1688 if (ch == '\0') 1689 goto done; 1690 fmt++; /* skip over '%' */ 1691 1692 flags = 0; 1693 1694 rflag: ch = *fmt++; 1695 reswitch: switch (ch) { 1696 case ' ': 1697 case '#': 1698 goto rflag; 1699 case '*': 1700 ADDASTER (); 1701 goto rflag; 1702 case '-': 1703 case '+': 1704 case '\'': 1705 goto rflag; 1706 case '.': 1707 if ((ch = *fmt++) == '*') { 1708 ADDASTER (); 1709 goto rflag; 1710 } 1711 while (is_digit(ch)) { 1712 ch = *fmt++; 1713 } 1714 goto reswitch; 1715 case '0': 1716 goto rflag; 1717 case '1': case '2': case '3': case '4': 1718 case '5': case '6': case '7': case '8': case '9': 1719 n = 0; 1720 do { 1721 n = 10 * n + to_digit(ch); 1722 ch = *fmt++; 1723 } while (is_digit(ch)); 1724 if (ch == '$') { 1725 nextarg = n; 1726 goto rflag; 1727 } 1728 goto reswitch; 1729 #ifndef NO_FLOATING_POINT 1730 case 'L': 1731 flags |= LONGDBL; 1732 goto rflag; 1733 #endif 1734 case 'h': 1735 if (flags & SHORTINT) { 1736 flags &= ~SHORTINT; 1737 flags |= CHARINT; 1738 } else 1739 flags |= SHORTINT; 1740 goto rflag; 1741 case 'j': 1742 flags |= INTMAXT; 1743 goto rflag; 1744 case 'l': 1745 if (flags & LONGINT) { 1746 flags &= ~LONGINT; 1747 flags |= LLONGINT; 1748 } else 1749 flags |= LONGINT; 1750 goto rflag; 1751 case 'q': 1752 flags |= LLONGINT; /* not necessarily */ 1753 goto rflag; 1754 case 't': 1755 flags |= PTRDIFFT; 1756 goto rflag; 1757 case 'z': 1758 flags |= SIZET; 1759 goto rflag; 1760 case 'C': 1761 flags |= LONGINT; 1762 /*FALLTHROUGH*/ 1763 case 'c': 1764 if (flags & LONGINT) 1765 ADDTYPE(T_WINT); 1766 else 1767 ADDTYPE(T_INT); 1768 break; 1769 case 'D': 1770 flags |= LONGINT; 1771 /*FALLTHROUGH*/ 1772 case 'd': 1773 case 'i': 1774 ADDSARG(); 1775 break; 1776 #ifndef NO_FLOATING_POINT 1777 case 'a': 1778 case 'A': 1779 case 'e': 1780 case 'E': 1781 case 'f': 1782 case 'g': 1783 case 'G': 1784 if (flags & LONGDBL) 1785 ADDTYPE(T_LONG_DOUBLE); 1786 else 1787 ADDTYPE(T_DOUBLE); 1788 break; 1789 #endif /* !NO_FLOATING_POINT */ 1790 case 'n': 1791 if (flags & INTMAXT) 1792 ADDTYPE(TP_INTMAXT); 1793 else if (flags & PTRDIFFT) 1794 ADDTYPE(TP_PTRDIFFT); 1795 else if (flags & SIZET) 1796 ADDTYPE(TP_SIZET); 1797 else if (flags & LLONGINT) 1798 ADDTYPE(TP_LLONG); 1799 else if (flags & LONGINT) 1800 ADDTYPE(TP_LONG); 1801 else if (flags & SHORTINT) 1802 ADDTYPE(TP_SHORT); 1803 else if (flags & CHARINT) 1804 ADDTYPE(TP_SCHAR); 1805 else 1806 ADDTYPE(TP_INT); 1807 continue; /* no output */ 1808 case 'O': 1809 flags |= LONGINT; 1810 /*FALLTHROUGH*/ 1811 case 'o': 1812 ADDUARG(); 1813 break; 1814 case 'p': 1815 ADDTYPE(TP_VOID); 1816 break; 1817 case 'S': 1818 flags |= LONGINT; 1819 /*FALLTHROUGH*/ 1820 case 's': 1821 if (flags & LONGINT) 1822 ADDTYPE(TP_WCHAR); 1823 else 1824 ADDTYPE(TP_CHAR); 1825 break; 1826 case 'U': 1827 flags |= LONGINT; 1828 /*FALLTHROUGH*/ 1829 case 'u': 1830 case 'X': 1831 case 'x': 1832 ADDUARG(); 1833 break; 1834 default: /* "%?" prints ?, unless ? is NUL */ 1835 if (ch == '\0') 1836 goto done; 1837 break; 1838 } 1839 } 1840 done: 1841 /* 1842 * nitems contains the number of arguments we picked from the stack. 1843 * If tablemax is larger, this means that some positional argument, 1844 * tried to pick an argument the number of arguments possibly supplied. 1845 * Since positional arguments are typically used to swap the order of 1846 * the printf arguments and not to pick random arguments from strange 1847 * positions in the stack, we assume that if the positional argument 1848 * is trying to pick beyond the end of arguments, then this is wrong. 1849 * Alternatively we could find a way to figure out when va_arg() runs 1850 * out, but how to do that? 1851 */ 1852 if (nitems < tablemax) { 1853 if (typetable != stattypetable) 1854 free(typetable); 1855 return -1; 1856 } 1857 /* 1858 * Build the argument table. 1859 */ 1860 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1861 *argtable = malloc(sizeof(**argtable) * (tablemax + 1)); 1862 if (*argtable == NULL) { 1863 free(typetable); 1864 return -1; 1865 } 1866 } 1867 1868 (*argtable) [0].intarg = 0; 1869 for (n = 1; n <= tablemax; n++) { 1870 switch (typetable [n]) { 1871 case T_UNUSED: /* whoops! */ 1872 (*argtable) [n].intarg = va_arg (ap, int); 1873 break; 1874 case TP_SCHAR: 1875 (*argtable) [n].pschararg = va_arg (ap, signed char *); 1876 break; 1877 case TP_SHORT: 1878 (*argtable) [n].pshortarg = va_arg (ap, short *); 1879 break; 1880 case T_INT: 1881 (*argtable) [n].intarg = va_arg (ap, int); 1882 break; 1883 case T_U_INT: 1884 (*argtable) [n].uintarg = va_arg (ap, unsigned int); 1885 break; 1886 case TP_INT: 1887 (*argtable) [n].pintarg = va_arg (ap, int *); 1888 break; 1889 case T_LONG: 1890 (*argtable) [n].longarg = va_arg (ap, long); 1891 break; 1892 case T_U_LONG: 1893 (*argtable) [n].ulongarg = va_arg (ap, unsigned long); 1894 break; 1895 case TP_LONG: 1896 (*argtable) [n].plongarg = va_arg (ap, long *); 1897 break; 1898 case T_LLONG: 1899 (*argtable) [n].longlongarg = va_arg (ap, long long); 1900 break; 1901 case T_U_LLONG: 1902 (*argtable) [n].ulonglongarg = va_arg (ap, unsigned long long); 1903 break; 1904 case TP_LLONG: 1905 (*argtable) [n].plonglongarg = va_arg (ap, long long *); 1906 break; 1907 case T_PTRDIFFT: 1908 (*argtable) [n].ptrdiffarg = va_arg (ap, ptrdiff_t); 1909 break; 1910 case TP_PTRDIFFT: 1911 (*argtable) [n].pptrdiffarg = va_arg (ap, ptrdiff_t *); 1912 break; 1913 case T_SSIZET: 1914 (*argtable) [n].ssizearg = va_arg (ap, ssize_t); 1915 break; 1916 case T_SIZET: 1917 (*argtable) [n].sizearg = va_arg (ap, size_t); 1918 break; 1919 case TP_SIZET: 1920 (*argtable) [n].psizearg = va_arg (ap, size_t *); 1921 break; 1922 case T_INTMAXT: 1923 (*argtable) [n].intmaxarg = va_arg (ap, intmax_t); 1924 break; 1925 case T_UINTMAXT: 1926 (*argtable) [n].uintmaxarg = va_arg (ap, uintmax_t); 1927 break; 1928 case TP_INTMAXT: 1929 (*argtable) [n].pintmaxarg = va_arg (ap, intmax_t *); 1930 break; 1931 case T_DOUBLE: 1932 #ifndef NO_FLOATING_POINT 1933 (*argtable) [n].doublearg = va_arg (ap, double); 1934 #endif 1935 break; 1936 case T_LONG_DOUBLE: 1937 #ifndef NO_FLOATING_POINT 1938 (*argtable) [n].longdoublearg = va_arg (ap, long double); 1939 #endif 1940 break; 1941 case TP_CHAR: 1942 (*argtable) [n].pchararg = va_arg (ap, char *); 1943 break; 1944 case TP_VOID: 1945 (*argtable) [n].pvoidarg = va_arg (ap, void *); 1946 break; 1947 case T_WINT: 1948 (*argtable) [n].wintarg = va_arg (ap, wint_t); 1949 break; 1950 case TP_WCHAR: 1951 (*argtable) [n].pwchararg = va_arg (ap, wchar_t *); 1952 break; 1953 } 1954 } 1955 1956 if (typetable != stattypetable) 1957 free (typetable); 1958 return 0; 1959 } 1960 1961 /* 1962 * Increase the size of the type table. 1963 */ 1964 static int 1965 __grow_type_table (size_t nextarg, enum typeid **typetable, size_t *tablesize) 1966 { 1967 enum typeid *const oldtable = *typetable; 1968 const size_t oldsize = *tablesize; 1969 enum typeid *newtable; 1970 size_t newsize = oldsize * 2; 1971 1972 if (newsize < nextarg + 1) 1973 newsize = nextarg + 1; 1974 if (oldsize == STATIC_ARG_TBL_SIZE) { 1975 if ((newtable = malloc(newsize * sizeof(*newtable))) == NULL) 1976 return -1; 1977 memcpy(newtable, oldtable, oldsize * sizeof(*newtable)); 1978 } else { 1979 newtable = realloc(oldtable, newsize * sizeof(*newtable)); 1980 if (newtable == NULL) { 1981 free(oldtable); 1982 return -1; 1983 } 1984 } 1985 memset(&newtable[oldsize], 0, (newsize - oldsize) * sizeof(*newtable)); 1986 1987 *typetable = newtable; 1988 *tablesize = newsize; 1989 return 0; 1990 } 1991 1992 1993 #ifndef NO_FLOATING_POINT 1994 #ifndef WIDE_DOUBLE 1995 static char * 1996 cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, 1997 int *length) 1998 { 1999 int mode, dsgn; 2000 char *digits, *bp, *rve; 2001 2002 _DIAGASSERT(decpt != NULL); 2003 _DIAGASSERT(length != NULL); 2004 _DIAGASSERT(sign != NULL); 2005 2006 if (ch == 'f') { 2007 mode = 3; /* ndigits after the decimal point */ 2008 } else { 2009 /* To obtain ndigits after the decimal point for the 'e' 2010 * and 'E' formats, round to ndigits + 1 significant 2011 * figures. 2012 */ 2013 if (ch == 'e' || ch == 'E') { 2014 ndigits++; 2015 } 2016 mode = 2; /* ndigits significant digits */ 2017 } 2018 2019 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 2020 if (digits == NULL) 2021 return NULL; 2022 if (dsgn) { 2023 value = -value; 2024 *sign = '-'; 2025 } else 2026 *sign = '\000'; 2027 if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ 2028 bp = digits + ndigits; 2029 if (ch == 'f') { 2030 if (*digits == '0' && value) 2031 *decpt = -ndigits + 1; 2032 bp += *decpt; 2033 } 2034 if (value == 0) /* kludge for __dtoa irregularity */ 2035 rve = bp; 2036 while (rve < bp) 2037 *rve++ = '0'; 2038 } 2039 *length = rve - digits; 2040 return digits; 2041 } 2042 #endif 2043 2044 static int 2045 exponent(CHAR_T *p0, int expo, int fmtch) 2046 { 2047 CHAR_T *p, *t; 2048 CHAR_T expbuf[MAXEXPDIG]; 2049 2050 p = p0; 2051 *p++ = fmtch; 2052 if (expo < 0) { 2053 expo = -expo; 2054 *p++ = '-'; 2055 } 2056 else 2057 *p++ = '+'; 2058 t = expbuf + MAXEXPDIG; 2059 if (expo > 9) { 2060 do { 2061 *--t = to_char(expo % 10); 2062 } while ((expo /= 10) > 9); 2063 *--t = to_char(expo); 2064 for (; t < expbuf + MAXEXPDIG; *p++ = *t++); 2065 } 2066 else { 2067 /* 2068 * Exponents for decimal floating point conversions 2069 * (%[eEgG]) must be at least two characters long, 2070 * whereas exponents for hexadecimal conversions can 2071 * be only one character long. 2072 */ 2073 if (fmtch == 'e' || fmtch == 'E') 2074 *p++ = '0'; 2075 *p++ = to_char(expo); 2076 } 2077 _DIAGASSERT(__type_fit(int, p - p0)); 2078 return (int)(p - p0); 2079 } 2080 #endif /* !NO_FLOATING_POINT */ 2081