vfwscanf.c revision 105317
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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include <sys/cdefs.h> 38#if 0 39#if defined(LIBC_SCCS) && !defined(lint) 40static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93"; 41#endif /* LIBC_SCCS and not lint */ 42__FBSDID("FreeBSD: src/lib/libc/stdio/vfscanf.c,v 1.24 2002/08/13 09:30:41 tjr Exp "); 43#endif 44__FBSDID("$FreeBSD: head/lib/libc/stdio/vfwscanf.c 105317 2002-10-17 12:02:36Z tjr $"); 45 46#include "namespace.h" 47#include <ctype.h> 48#include <inttypes.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <stddef.h> 52#include <stdarg.h> 53#include <string.h> 54#include <wchar.h> 55#include <wctype.h> 56#include "un-namespace.h" 57 58#include "libc_private.h" 59#include "local.h" 60 61#define FLOATING_POINT 62 63#ifdef FLOATING_POINT 64#include <locale.h> 65#include "floatio.h" 66#endif 67 68#define BUF 513 /* Maximum length of numeric string. */ 69 70/* 71 * Flags used during conversion. 72 */ 73#define LONG 0x01 /* l: long or double */ 74#define LONGDBL 0x02 /* L: long double */ 75#define SHORT 0x04 /* h: short */ 76#define SUPPRESS 0x08 /* *: suppress assignment */ 77#define POINTER 0x10 /* p: void * (as hex) */ 78#define NOSKIP 0x20 /* [ or c: do not skip blanks */ 79#define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 80#define INTMAXT 0x800 /* j: intmax_t */ 81#define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 82#define SIZET 0x2000 /* z: size_t */ 83#define SHORTSHORT 0x4000 /* hh: char */ 84#define UNSIGNED 0x8000 /* %[oupxX] conversions */ 85 86/* 87 * The following are used in numeric conversions only: 88 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 89 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 90 */ 91#define SIGNOK 0x40 /* +/- is (still) legal */ 92#define NDIGITS 0x80 /* no digits detected */ 93 94#define DPTOK 0x100 /* (float) decimal point is still legal */ 95#define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ 96 97#define PFXOK 0x100 /* 0x prefix is (still) legal */ 98#define NZDIGITS 0x200 /* no zero digits detected */ 99 100/* 101 * Conversion types. 102 */ 103#define CT_CHAR 0 /* %c conversion */ 104#define CT_CCL 1 /* %[...] conversion */ 105#define CT_STRING 2 /* %s conversion */ 106#define CT_INT 3 /* %[dioupxX] conversion */ 107#define CT_FLOAT 4 /* %[efgEFG] conversion */ 108 109#define INCCL(_c) \ 110 (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \ 111 (wmemchr(ccls, (_c), ccle - ccls) != NULL)) 112 113/* 114 * MT-safe version. 115 */ 116int 117vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) 118{ 119 int ret; 120 121 FLOCKFILE(fp); 122 ORIENT(fp, 1); 123 ret = __vfwscanf(fp, fmt, ap); 124 FUNLOCKFILE(fp); 125 return (ret); 126} 127 128/* 129 * Non-MT-safe version. 130 */ 131int 132__vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) 133{ 134 wint_t c; /* character from format, or conversion */ 135 size_t width; /* field width, or 0 */ 136 wchar_t *p; /* points into all kinds of strings */ 137 int n; /* handy integer */ 138 int flags; /* flags as defined above */ 139 wchar_t *p0; /* saves original value of p when necessary */ 140 int nassigned; /* number of fields assigned */ 141 int nconversions; /* number of conversions */ 142 int nread; /* number of characters consumed from fp */ 143 int base; /* base argument to conversion function */ 144 wchar_t buf[BUF]; /* buffer for numeric conversions */ 145 const wchar_t *ccls; /* character class start */ 146 const wchar_t *ccle; /* character class end */ 147 int cclcompl; /* ccl is complemented? */ 148 wint_t wi; /* handy wint_t */ 149 char *mbp; /* multibyte string pointer for %c %s %[ */ 150 size_t nconv; /* number of bytes in mb. conversion */ 151 mbstate_t mbs; /* multibyte state */ 152 char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ 153 154 /* `basefix' is used to avoid `if' tests in the integer scanner */ 155 static short basefix[17] = 156 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 157#ifdef FLOATING_POINT 158 char decimal_point = localeconv()->decimal_point[0]; 159#endif 160 161 nassigned = 0; 162 nconversions = 0; 163 nread = 0; 164 ccls = ccle = NULL; 165 for (;;) { 166 c = *fmt++; 167 if (c == 0) 168 return (nassigned); 169 if (iswspace(c)) { 170 while ((c = __fgetwc(fp)) != WEOF && 171 iswspace(c)) 172 ; 173 if (c != WEOF) 174 __ungetwc(c, fp); 175 continue; 176 } 177 if (c != '%') 178 goto literal; 179 width = 0; 180 flags = 0; 181 /* 182 * switch on the format. continue if done; 183 * break once format type is derived. 184 */ 185again: c = *fmt++; 186 switch (c) { 187 case '%': 188literal: 189 if ((wi = __fgetwc(fp)) == WEOF) 190 goto input_failure; 191 if (wi != c) { 192 __ungetwc(wi, fp); 193 goto input_failure; 194 } 195 nread++; 196 continue; 197 198 case '*': 199 flags |= SUPPRESS; 200 goto again; 201 case 'j': 202 flags |= INTMAXT; 203 goto again; 204 case 'l': 205 if (flags & LONG) { 206 flags &= ~LONG; 207 flags |= LONGLONG; 208 } else 209 flags |= LONG; 210 goto again; 211 case 'q': 212 flags |= LONGLONG; /* not quite */ 213 goto again; 214 case 't': 215 flags |= PTRDIFFT; 216 goto again; 217 case 'z': 218 flags |= SIZET; 219 goto again; 220 case 'L': 221 flags |= LONGDBL; 222 goto again; 223 case 'h': 224 if (flags & SHORT) { 225 flags &= ~SHORT; 226 flags |= SHORTSHORT; 227 } else 228 flags |= SHORT; 229 goto again; 230 231 case '0': case '1': case '2': case '3': case '4': 232 case '5': case '6': case '7': case '8': case '9': 233 width = width * 10 + c - '0'; 234 goto again; 235 236 /* 237 * Conversions. 238 */ 239 case 'd': 240 c = CT_INT; 241 base = 10; 242 break; 243 244 case 'i': 245 c = CT_INT; 246 base = 0; 247 break; 248 249 case 'o': 250 c = CT_INT; 251 flags |= UNSIGNED; 252 base = 8; 253 break; 254 255 case 'u': 256 c = CT_INT; 257 flags |= UNSIGNED; 258 base = 10; 259 break; 260 261 case 'X': 262 case 'x': 263 flags |= PFXOK; /* enable 0x prefixing */ 264 c = CT_INT; 265 flags |= UNSIGNED; 266 base = 16; 267 break; 268 269#ifdef FLOATING_POINT 270 case 'E': case 'F': case 'G': 271 case 'e': case 'f': case 'g': 272 c = CT_FLOAT; 273 break; 274#endif 275 276 case 'S': 277 flags |= LONG; 278 /* FALLTHROUGH */ 279 case 's': 280 c = CT_STRING; 281 break; 282 283 case '[': 284 ccls = fmt; 285 if (*fmt == '^') { 286 cclcompl = 1; 287 fmt++; 288 } else 289 cclcompl = 0; 290 if (*fmt == ']') 291 fmt++; 292 while (*fmt != '\0' && *fmt != ']') 293 fmt++; 294 ccle = fmt; 295 fmt++; 296 flags |= NOSKIP; 297 c = CT_CCL; 298 break; 299 300 case 'C': 301 flags |= LONG; 302 /* FALLTHROUGH */ 303 case 'c': 304 flags |= NOSKIP; 305 c = CT_CHAR; 306 break; 307 308 case 'p': /* pointer format is like hex */ 309 flags |= POINTER | PFXOK; 310 c = CT_INT; /* assumes sizeof(uintmax_t) */ 311 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 312 base = 16; 313 break; 314 315 case 'n': 316 nconversions++; 317 if (flags & SUPPRESS) /* ??? */ 318 continue; 319 if (flags & SHORTSHORT) 320 *va_arg(ap, char *) = nread; 321 else if (flags & SHORT) 322 *va_arg(ap, short *) = nread; 323 else if (flags & LONG) 324 *va_arg(ap, long *) = nread; 325 else if (flags & LONGLONG) 326 *va_arg(ap, long long *) = nread; 327 else if (flags & INTMAXT) 328 *va_arg(ap, intmax_t *) = nread; 329 else if (flags & SIZET) 330 *va_arg(ap, size_t *) = nread; 331 else if (flags & PTRDIFFT) 332 *va_arg(ap, ptrdiff_t *) = nread; 333 else 334 *va_arg(ap, int *) = nread; 335 continue; 336 337 default: 338 goto match_failure; 339 340 /* 341 * Disgusting backwards compatibility hack. XXX 342 */ 343 case '\0': /* compat */ 344 return (EOF); 345 } 346 347 /* 348 * Consume leading white space, except for formats 349 * that suppress this. 350 */ 351 if ((flags & NOSKIP) == 0) { 352 while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi)) 353 nread++; 354 if (wi == WEOF) 355 goto input_failure; 356 __ungetwc(wi, fp); 357 } 358 359 /* 360 * Do the conversion. 361 */ 362 switch (c) { 363 364 case CT_CHAR: 365 /* scan arbitrary characters (sets NOSKIP) */ 366 if (width == 0) 367 width = 1; 368 if (flags & LONG) { 369 if (!(flags & SUPPRESS)) 370 p = va_arg(ap, wchar_t *); 371 n = 0; 372 while (width-- != 0 && 373 (wi = __fgetwc(fp)) != WEOF) { 374 if (!(flags & SUPPRESS)) 375 *p++ = (wchar_t)wi; 376 n++; 377 } 378 if (n == 0) 379 goto input_failure; 380 nread += n; 381 if (!(flags & SUPPRESS)) 382 nassigned++; 383 } else { 384 if (!(flags & SUPPRESS)) 385 mbp = va_arg(ap, char *); 386 n = 0; 387 memset(&mbs, 0, sizeof(mbs)); 388 while (width != 0 && 389 (wi = __fgetwc(fp)) != WEOF) { 390 if (width >= MB_CUR_MAX && 391 !(flags & SUPPRESS)) { 392 nconv = wcrtomb(mbp, wi, &mbs); 393 if (nconv == (size_t)-1) 394 goto input_failure; 395 } else { 396 nconv = wcrtomb(mbbuf, wi, 397 &mbs); 398 if (nconv == (size_t)-1) 399 goto input_failure; 400 if (nconv > width) { 401 __ungetwc(wi, fp); 402 break; 403 } 404 if (!(flags & SUPPRESS)) 405 memcpy(mbp, mbbuf, 406 nconv); 407 } 408 if (!(flags & SUPPRESS)) 409 mbp += nconv; 410 width -= nconv; 411 n++; 412 } 413 if (n == 0) 414 goto input_failure; 415 nread += n; 416 if (!(flags & SUPPRESS)) 417 nassigned++; 418 } 419 nconversions++; 420 break; 421 422 case CT_CCL: 423 /* scan a (nonempty) character class (sets NOSKIP) */ 424 if (width == 0) 425 width = (size_t)~0; /* `infinity' */ 426 /* take only those things in the class */ 427 if ((flags & SUPPRESS) && (flags & LONG)) { 428 n = 0; 429 while ((wi = __fgetwc(fp)) != WEOF && 430 width-- != 0 && INCCL(wi)) 431 n++; 432 if (wi != WEOF) 433 __ungetwc(wi, fp); 434 if (n == 0) 435 goto match_failure; 436 } else if (flags & LONG) { 437 p0 = p = va_arg(ap, wchar_t *); 438 while ((wi = __fgetwc(fp)) != WEOF && 439 width-- != 0 && INCCL(wi)) 440 *p++ = (wchar_t)wi; 441 if (wi != WEOF) 442 __ungetwc(wi, fp); 443 n = p - p0; 444 if (n == 0) 445 goto match_failure; 446 *p = 0; 447 nassigned++; 448 } else { 449 if (!(flags & SUPPRESS)) 450 mbp = va_arg(ap, char *); 451 n = 0; 452 memset(&mbs, 0, sizeof(mbs)); 453 while ((wi = __fgetwc(fp)) != WEOF && 454 width != 0 && INCCL(wi)) { 455 if (width >= MB_CUR_MAX && 456 !(flags & SUPPRESS)) { 457 nconv = wcrtomb(mbp, wi, &mbs); 458 if (nconv == (size_t)-1) 459 goto input_failure; 460 } else { 461 nconv = wcrtomb(mbbuf, wi, 462 &mbs); 463 if (nconv == (size_t)-1) 464 goto input_failure; 465 if (nconv > width) 466 break; 467 if (!(flags & SUPPRESS)) 468 memcpy(mbp, mbbuf, 469 nconv); 470 } 471 if (!(flags & SUPPRESS)) 472 mbp += nconv; 473 width -= nconv; 474 n++; 475 } 476 if (wi != WEOF) 477 __ungetwc(wi, fp); 478 if (!(flags & SUPPRESS)) { 479 *mbp = 0; 480 nassigned++; 481 } 482 } 483 nread += n; 484 nconversions++; 485 break; 486 487 case CT_STRING: 488 /* like CCL, but zero-length string OK, & no NOSKIP */ 489 if (width == 0) 490 width = (size_t)~0; 491 if ((flags & SUPPRESS) && (flags & LONG)) { 492 while ((wi = __fgetwc(fp)) != WEOF && 493 width-- != 0 && 494 !iswspace(wi)) 495 nread++; 496 if (wi != WEOF) 497 __ungetwc(wi, fp); 498 } else if (flags & LONG) { 499 p0 = p = va_arg(ap, wchar_t *); 500 while ((wi = __fgetwc(fp)) != WEOF && 501 width-- != 0 && 502 !iswspace(wi)) { 503 *p++ = (wchar_t)wi; 504 nread++; 505 } 506 if (wi != WEOF) 507 __ungetwc(wi, fp); 508 *p = '\0'; 509 nassigned++; 510 } else { 511 if (!(flags & SUPPRESS)) 512 mbp = va_arg(ap, char *); 513 memset(&mbs, 0, sizeof(mbs)); 514 while ((wi = __fgetwc(fp)) != WEOF && 515 width != 0 && 516 !iswspace(wi)) { 517 if (width >= MB_CUR_MAX && 518 !(flags & SUPPRESS)) { 519 nconv = wcrtomb(mbp, wi, &mbs); 520 if (nconv == (size_t)-1) 521 goto input_failure; 522 } else { 523 nconv = wcrtomb(mbbuf, wi, 524 &mbs); 525 if (nconv == (size_t)-1) 526 goto input_failure; 527 if (nconv > width) 528 break; 529 if (!(flags & SUPPRESS)) 530 memcpy(mbp, mbbuf, 531 nconv); 532 } 533 if (!(flags & SUPPRESS)) 534 mbp += nconv; 535 width -= nconv; 536 nread++; 537 } 538 if (wi != WEOF) 539 __ungetwc(wi, fp); 540 if (!(flags & SUPPRESS)) { 541 *mbp = 0; 542 nassigned++; 543 } 544 } 545 nconversions++; 546 continue; 547 548 case CT_INT: 549 /* scan an integer as if by the conversion function */ 550#ifdef hardway 551 if (width == 0 || width > sizeof(buf) - 1) 552 width = sizeof(buf) - 1; 553#else 554 /* size_t is unsigned, hence this optimisation */ 555 if (--width > sizeof(buf) - 2) 556 width = sizeof(buf) - 2; 557 width++; 558#endif 559 flags |= SIGNOK | NDIGITS | NZDIGITS; 560 for (p = buf; width; width--) { 561 c = __fgetwc(fp); 562 /* 563 * Switch on the character; `goto ok' 564 * if we accept it as a part of number. 565 */ 566 switch (c) { 567 568 /* 569 * The digit 0 is always legal, but is 570 * special. For %i conversions, if no 571 * digits (zero or nonzero) have been 572 * scanned (only signs), we will have 573 * base==0. In that case, we should set 574 * it to 8 and enable 0x prefixing. 575 * Also, if we have not scanned zero digits 576 * before this, do not turn off prefixing 577 * (someone else will turn it off if we 578 * have scanned any nonzero digits). 579 */ 580 case '0': 581 if (base == 0) { 582 base = 8; 583 flags |= PFXOK; 584 } 585 if (flags & NZDIGITS) 586 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 587 else 588 flags &= ~(SIGNOK|PFXOK|NDIGITS); 589 goto ok; 590 591 /* 1 through 7 always legal */ 592 case '1': case '2': case '3': 593 case '4': case '5': case '6': case '7': 594 base = basefix[base]; 595 flags &= ~(SIGNOK | PFXOK | NDIGITS); 596 goto ok; 597 598 /* digits 8 and 9 ok iff decimal or hex */ 599 case '8': case '9': 600 base = basefix[base]; 601 if (base <= 8) 602 break; /* not legal here */ 603 flags &= ~(SIGNOK | PFXOK | NDIGITS); 604 goto ok; 605 606 /* letters ok iff hex */ 607 case 'A': case 'B': case 'C': 608 case 'D': case 'E': case 'F': 609 case 'a': case 'b': case 'c': 610 case 'd': case 'e': case 'f': 611 /* no need to fix base here */ 612 if (base <= 10) 613 break; /* not legal here */ 614 flags &= ~(SIGNOK | PFXOK | NDIGITS); 615 goto ok; 616 617 /* sign ok only as first character */ 618 case '+': case '-': 619 if (flags & SIGNOK) { 620 flags &= ~SIGNOK; 621 goto ok; 622 } 623 break; 624 625 /* x ok iff flag still set & 2nd char */ 626 case 'x': case 'X': 627 if (flags & PFXOK && p == buf + 1) { 628 base = 16; /* if %i */ 629 flags &= ~PFXOK; 630 goto ok; 631 } 632 break; 633 } 634 635 /* 636 * If we got here, c is not a legal character 637 * for a number. Stop accumulating digits. 638 */ 639 if (c != WEOF) 640 __ungetwc(c, fp); 641 break; 642 ok: 643 /* 644 * c is legal: store it and look at the next. 645 */ 646 *p++ = (wchar_t)c; 647 } 648 /* 649 * If we had only a sign, it is no good; push 650 * back the sign. If the number ends in `x', 651 * it was [sign] '0' 'x', so push back the x 652 * and treat it as [sign] '0'. 653 */ 654 if (flags & NDIGITS) { 655 if (p > buf) 656 __ungetwc(*--p, fp); 657 goto match_failure; 658 } 659 c = p[-1]; 660 if (c == 'x' || c == 'X') { 661 --p; 662 __ungetwc(c, fp); 663 } 664 if ((flags & SUPPRESS) == 0) { 665 uintmax_t res; 666 667 *p = 0; 668 if ((flags & UNSIGNED) == 0) 669 res = wcstoimax(buf, NULL, base); 670 else 671 res = wcstoumax(buf, NULL, base); 672 if (flags & POINTER) 673 *va_arg(ap, void **) = 674 (void *)(uintptr_t)res; 675 else if (flags & SHORTSHORT) 676 *va_arg(ap, char *) = res; 677 else if (flags & SHORT) 678 *va_arg(ap, short *) = res; 679 else if (flags & LONG) 680 *va_arg(ap, long *) = res; 681 else if (flags & LONGLONG) 682 *va_arg(ap, long long *) = res; 683 else if (flags & INTMAXT) 684 *va_arg(ap, intmax_t *) = res; 685 else if (flags & PTRDIFFT) 686 *va_arg(ap, ptrdiff_t *) = res; 687 else if (flags & SIZET) 688 *va_arg(ap, size_t *) = res; 689 else 690 *va_arg(ap, int *) = res; 691 nassigned++; 692 } 693 nread += p - buf; 694 nconversions++; 695 break; 696 697#ifdef FLOATING_POINT 698 case CT_FLOAT: 699 /* scan a floating point number as if by strtod */ 700#ifdef hardway 701 if (width == 0 || width > sizeof(buf) - 1) 702 width = sizeof(buf) - 1; 703#else 704 /* size_t is unsigned, hence this optimisation */ 705 if (--width > sizeof(buf) - 2) 706 width = sizeof(buf) - 2; 707 width++; 708#endif 709 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 710 for (p = buf; width; width--) { 711 c = __fgetwc(fp); 712 /* 713 * This code mimicks the integer conversion 714 * code, but is much simpler. 715 */ 716 switch (c) { 717 718 case '0': case '1': case '2': case '3': 719 case '4': case '5': case '6': case '7': 720 case '8': case '9': 721 flags &= ~(SIGNOK | NDIGITS); 722 goto fok; 723 724 case '+': case '-': 725 if (flags & SIGNOK) { 726 flags &= ~SIGNOK; 727 goto fok; 728 } 729 break; 730 case 'e': case 'E': 731 /* no exponent without some digits */ 732 if ((flags&(NDIGITS|EXPOK)) == EXPOK) { 733 flags = 734 (flags & ~(EXPOK|DPTOK)) | 735 SIGNOK | NDIGITS; 736 goto fok; 737 } 738 break; 739 default: 740 if (c == (wchar_t)decimal_point && 741 (flags & DPTOK)) { 742 flags &= ~(SIGNOK | DPTOK); 743 goto fok; 744 } 745 break; 746 } 747 if (c != WEOF) 748 __ungetwc(c, fp); 749 break; 750 fok: 751 *p++ = c; 752 } 753 /* 754 * If no digits, might be missing exponent digits 755 * (just give back the exponent) or might be missing 756 * regular digits, but had sign and/or decimal point. 757 */ 758 if (flags & NDIGITS) { 759 if (flags & EXPOK) { 760 /* no digits at all */ 761 while (p > buf) 762 __ungetwc(*--p, fp); 763 goto match_failure; 764 } 765 /* just a bad exponent (e and maybe sign) */ 766 c = *--p; 767 if (c != 'e' && c != 'E') { 768 __ungetwc(c, fp);/* sign */ 769 c = *--p; 770 } 771 __ungetwc(c, fp); 772 } 773 if ((flags & SUPPRESS) == 0) { 774 double res; 775 776 *p = 0; 777 /* XXX this loses precision for long doubles. */ 778 res = wcstod(buf, NULL); 779 if (flags & LONGDBL) 780 *va_arg(ap, long double *) = res; 781 else if (flags & LONG) 782 *va_arg(ap, double *) = res; 783 else 784 *va_arg(ap, float *) = res; 785 nassigned++; 786 } 787 nread += p - buf; 788 nconversions++; 789 break; 790#endif /* FLOATING_POINT */ 791 } 792 } 793input_failure: 794 return (nconversions != 0 ? nassigned : EOF); 795match_failure: 796 return (nassigned); 797} 798