vfwscanf.c revision 106282
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 106282 2002-11-01 05:13:01Z 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#endif 66 67#define BUF 513 /* Maximum length of numeric string. */ 68 69/* 70 * Flags used during conversion. 71 */ 72#define LONG 0x01 /* l: long or double */ 73#define LONGDBL 0x02 /* L: long double */ 74#define SHORT 0x04 /* h: short */ 75#define SUPPRESS 0x08 /* *: suppress assignment */ 76#define POINTER 0x10 /* p: void * (as hex) */ 77#define NOSKIP 0x20 /* [ or c: do not skip blanks */ 78#define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 79#define INTMAXT 0x800 /* j: intmax_t */ 80#define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 81#define SIZET 0x2000 /* z: size_t */ 82#define SHORTSHORT 0x4000 /* hh: char */ 83#define UNSIGNED 0x8000 /* %[oupxX] conversions */ 84 85/* 86 * The following are used in numeric conversions only: 87 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 88 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 89 */ 90#define SIGNOK 0x40 /* +/- is (still) legal */ 91#define NDIGITS 0x80 /* no digits detected */ 92 93#define DPTOK 0x100 /* (float) decimal point is still legal */ 94#define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ 95 96#define PFXOK 0x100 /* 0x prefix is (still) legal */ 97#define NZDIGITS 0x200 /* no zero digits detected */ 98 99/* 100 * Conversion types. 101 */ 102#define CT_CHAR 0 /* %c conversion */ 103#define CT_CCL 1 /* %[...] conversion */ 104#define CT_STRING 2 /* %s conversion */ 105#define CT_INT 3 /* %[dioupxX] conversion */ 106#define CT_FLOAT 4 /* %[efgEFG] conversion */ 107 108#define INCCL(_c) \ 109 (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \ 110 (wmemchr(ccls, (_c), ccle - ccls) != NULL)) 111 112/* 113 * MT-safe version. 114 */ 115int 116vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) 117{ 118 int ret; 119 120 FLOCKFILE(fp); 121 ORIENT(fp, 1); 122 ret = __vfwscanf(fp, fmt, ap); 123 FUNLOCKFILE(fp); 124 return (ret); 125} 126 127/* 128 * Non-MT-safe version. 129 */ 130int 131__vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) 132{ 133 wint_t c; /* character from format, or conversion */ 134 size_t width; /* field width, or 0 */ 135 wchar_t *p; /* points into all kinds of strings */ 136 int n; /* handy integer */ 137 int flags; /* flags as defined above */ 138 wchar_t *p0; /* saves original value of p when necessary */ 139 int nassigned; /* number of fields assigned */ 140 int nconversions; /* number of conversions */ 141 int nread; /* number of characters consumed from fp */ 142 int base; /* base argument to conversion function */ 143 wchar_t buf[BUF]; /* buffer for numeric conversions */ 144 const wchar_t *ccls; /* character class start */ 145 const wchar_t *ccle; /* character class end */ 146 int cclcompl; /* ccl is complemented? */ 147 wint_t wi; /* handy wint_t */ 148 char *mbp; /* multibyte string pointer for %c %s %[ */ 149 size_t nconv; /* number of bytes in mb. conversion */ 150 mbstate_t mbs; /* multibyte state */ 151 char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ 152 153 /* `basefix' is used to avoid `if' tests in the integer scanner */ 154 static short basefix[17] = 155 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 156#ifdef FLOATING_POINT 157 char decimal_point = localeconv()->decimal_point[0]; 158#endif 159 160 nassigned = 0; 161 nconversions = 0; 162 nread = 0; 163 ccls = ccle = NULL; 164 for (;;) { 165 c = *fmt++; 166 if (c == 0) 167 return (nassigned); 168 if (iswspace(c)) { 169 while ((c = __fgetwc(fp)) != WEOF && 170 iswspace(c)) 171 ; 172 if (c != WEOF) 173 __ungetwc(c, fp); 174 continue; 175 } 176 if (c != '%') 177 goto literal; 178 width = 0; 179 flags = 0; 180 /* 181 * switch on the format. continue if done; 182 * break once format type is derived. 183 */ 184again: c = *fmt++; 185 switch (c) { 186 case '%': 187literal: 188 if ((wi = __fgetwc(fp)) == WEOF) 189 goto input_failure; 190 if (wi != c) { 191 __ungetwc(wi, fp); 192 goto input_failure; 193 } 194 nread++; 195 continue; 196 197 case '*': 198 flags |= SUPPRESS; 199 goto again; 200 case 'j': 201 flags |= INTMAXT; 202 goto again; 203 case 'l': 204 if (flags & LONG) { 205 flags &= ~LONG; 206 flags |= LONGLONG; 207 } else 208 flags |= LONG; 209 goto again; 210 case 'q': 211 flags |= LONGLONG; /* not quite */ 212 goto again; 213 case 't': 214 flags |= PTRDIFFT; 215 goto again; 216 case 'z': 217 flags |= SIZET; 218 goto again; 219 case 'L': 220 flags |= LONGDBL; 221 goto again; 222 case 'h': 223 if (flags & SHORT) { 224 flags &= ~SHORT; 225 flags |= SHORTSHORT; 226 } else 227 flags |= SHORT; 228 goto again; 229 230 case '0': case '1': case '2': case '3': case '4': 231 case '5': case '6': case '7': case '8': case '9': 232 width = width * 10 + c - '0'; 233 goto again; 234 235 /* 236 * Conversions. 237 */ 238 case 'd': 239 c = CT_INT; 240 base = 10; 241 break; 242 243 case 'i': 244 c = CT_INT; 245 base = 0; 246 break; 247 248 case 'o': 249 c = CT_INT; 250 flags |= UNSIGNED; 251 base = 8; 252 break; 253 254 case 'u': 255 c = CT_INT; 256 flags |= UNSIGNED; 257 base = 10; 258 break; 259 260 case 'X': 261 case 'x': 262 flags |= PFXOK; /* enable 0x prefixing */ 263 c = CT_INT; 264 flags |= UNSIGNED; 265 base = 16; 266 break; 267 268#ifdef FLOATING_POINT 269 case 'E': case 'F': case 'G': 270 case 'e': case 'f': case 'g': 271 c = CT_FLOAT; 272 break; 273#endif 274 275 case 'S': 276 flags |= LONG; 277 /* FALLTHROUGH */ 278 case 's': 279 c = CT_STRING; 280 break; 281 282 case '[': 283 ccls = fmt; 284 if (*fmt == '^') { 285 cclcompl = 1; 286 fmt++; 287 } else 288 cclcompl = 0; 289 if (*fmt == ']') 290 fmt++; 291 while (*fmt != '\0' && *fmt != ']') 292 fmt++; 293 ccle = fmt; 294 fmt++; 295 flags |= NOSKIP; 296 c = CT_CCL; 297 break; 298 299 case 'C': 300 flags |= LONG; 301 /* FALLTHROUGH */ 302 case 'c': 303 flags |= NOSKIP; 304 c = CT_CHAR; 305 break; 306 307 case 'p': /* pointer format is like hex */ 308 flags |= POINTER | PFXOK; 309 c = CT_INT; /* assumes sizeof(uintmax_t) */ 310 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 311 base = 16; 312 break; 313 314 case 'n': 315 nconversions++; 316 if (flags & SUPPRESS) /* ??? */ 317 continue; 318 if (flags & SHORTSHORT) 319 *va_arg(ap, char *) = nread; 320 else if (flags & SHORT) 321 *va_arg(ap, short *) = nread; 322 else if (flags & LONG) 323 *va_arg(ap, long *) = nread; 324 else if (flags & LONGLONG) 325 *va_arg(ap, long long *) = nread; 326 else if (flags & INTMAXT) 327 *va_arg(ap, intmax_t *) = nread; 328 else if (flags & SIZET) 329 *va_arg(ap, size_t *) = nread; 330 else if (flags & PTRDIFFT) 331 *va_arg(ap, ptrdiff_t *) = nread; 332 else 333 *va_arg(ap, int *) = nread; 334 continue; 335 336 default: 337 goto match_failure; 338 339 /* 340 * Disgusting backwards compatibility hack. XXX 341 */ 342 case '\0': /* compat */ 343 return (EOF); 344 } 345 346 /* 347 * Consume leading white space, except for formats 348 * that suppress this. 349 */ 350 if ((flags & NOSKIP) == 0) { 351 while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi)) 352 nread++; 353 if (wi == WEOF) 354 goto input_failure; 355 __ungetwc(wi, fp); 356 } 357 358 /* 359 * Do the conversion. 360 */ 361 switch (c) { 362 363 case CT_CHAR: 364 /* scan arbitrary characters (sets NOSKIP) */ 365 if (width == 0) 366 width = 1; 367 if (flags & LONG) { 368 if (!(flags & SUPPRESS)) 369 p = va_arg(ap, wchar_t *); 370 n = 0; 371 while (width-- != 0 && 372 (wi = __fgetwc(fp)) != WEOF) { 373 if (!(flags & SUPPRESS)) 374 *p++ = (wchar_t)wi; 375 n++; 376 } 377 if (n == 0) 378 goto input_failure; 379 nread += n; 380 if (!(flags & SUPPRESS)) 381 nassigned++; 382 } else { 383 if (!(flags & SUPPRESS)) 384 mbp = va_arg(ap, char *); 385 n = 0; 386 memset(&mbs, 0, sizeof(mbs)); 387 while (width != 0 && 388 (wi = __fgetwc(fp)) != WEOF) { 389 if (width >= MB_CUR_MAX && 390 !(flags & SUPPRESS)) { 391 nconv = wcrtomb(mbp, wi, &mbs); 392 if (nconv == (size_t)-1) 393 goto input_failure; 394 } else { 395 nconv = wcrtomb(mbbuf, wi, 396 &mbs); 397 if (nconv == (size_t)-1) 398 goto input_failure; 399 if (nconv > width) { 400 __ungetwc(wi, fp); 401 break; 402 } 403 if (!(flags & SUPPRESS)) 404 memcpy(mbp, mbbuf, 405 nconv); 406 } 407 if (!(flags & SUPPRESS)) 408 mbp += nconv; 409 width -= nconv; 410 n++; 411 } 412 if (n == 0) 413 goto input_failure; 414 nread += n; 415 if (!(flags & SUPPRESS)) 416 nassigned++; 417 } 418 nconversions++; 419 break; 420 421 case CT_CCL: 422 /* scan a (nonempty) character class (sets NOSKIP) */ 423 if (width == 0) 424 width = (size_t)~0; /* `infinity' */ 425 /* take only those things in the class */ 426 if ((flags & SUPPRESS) && (flags & LONG)) { 427 n = 0; 428 while ((wi = __fgetwc(fp)) != WEOF && 429 width-- != 0 && INCCL(wi)) 430 n++; 431 if (wi != WEOF) 432 __ungetwc(wi, fp); 433 if (n == 0) 434 goto match_failure; 435 } else if (flags & LONG) { 436 p0 = p = va_arg(ap, wchar_t *); 437 while ((wi = __fgetwc(fp)) != WEOF && 438 width-- != 0 && INCCL(wi)) 439 *p++ = (wchar_t)wi; 440 if (wi != WEOF) 441 __ungetwc(wi, fp); 442 n = p - p0; 443 if (n == 0) 444 goto match_failure; 445 *p = 0; 446 nassigned++; 447 } else { 448 if (!(flags & SUPPRESS)) 449 mbp = va_arg(ap, char *); 450 n = 0; 451 memset(&mbs, 0, sizeof(mbs)); 452 while ((wi = __fgetwc(fp)) != WEOF && 453 width != 0 && INCCL(wi)) { 454 if (width >= MB_CUR_MAX && 455 !(flags & SUPPRESS)) { 456 nconv = wcrtomb(mbp, wi, &mbs); 457 if (nconv == (size_t)-1) 458 goto input_failure; 459 } else { 460 nconv = wcrtomb(mbbuf, wi, 461 &mbs); 462 if (nconv == (size_t)-1) 463 goto input_failure; 464 if (nconv > width) 465 break; 466 if (!(flags & SUPPRESS)) 467 memcpy(mbp, mbbuf, 468 nconv); 469 } 470 if (!(flags & SUPPRESS)) 471 mbp += nconv; 472 width -= nconv; 473 n++; 474 } 475 if (wi != WEOF) 476 __ungetwc(wi, fp); 477 if (!(flags & SUPPRESS)) { 478 *mbp = 0; 479 nassigned++; 480 } 481 } 482 nread += n; 483 nconversions++; 484 break; 485 486 case CT_STRING: 487 /* like CCL, but zero-length string OK, & no NOSKIP */ 488 if (width == 0) 489 width = (size_t)~0; 490 if ((flags & SUPPRESS) && (flags & LONG)) { 491 while ((wi = __fgetwc(fp)) != WEOF && 492 width-- != 0 && 493 !iswspace(wi)) 494 nread++; 495 if (wi != WEOF) 496 __ungetwc(wi, fp); 497 } else if (flags & LONG) { 498 p0 = p = va_arg(ap, wchar_t *); 499 while ((wi = __fgetwc(fp)) != WEOF && 500 width-- != 0 && 501 !iswspace(wi)) { 502 *p++ = (wchar_t)wi; 503 nread++; 504 } 505 if (wi != WEOF) 506 __ungetwc(wi, fp); 507 *p = '\0'; 508 nassigned++; 509 } else { 510 if (!(flags & SUPPRESS)) 511 mbp = va_arg(ap, char *); 512 memset(&mbs, 0, sizeof(mbs)); 513 while ((wi = __fgetwc(fp)) != WEOF && 514 width != 0 && 515 !iswspace(wi)) { 516 if (width >= MB_CUR_MAX && 517 !(flags & SUPPRESS)) { 518 nconv = wcrtomb(mbp, wi, &mbs); 519 if (nconv == (size_t)-1) 520 goto input_failure; 521 } else { 522 nconv = wcrtomb(mbbuf, wi, 523 &mbs); 524 if (nconv == (size_t)-1) 525 goto input_failure; 526 if (nconv > width) 527 break; 528 if (!(flags & SUPPRESS)) 529 memcpy(mbp, mbbuf, 530 nconv); 531 } 532 if (!(flags & SUPPRESS)) 533 mbp += nconv; 534 width -= nconv; 535 nread++; 536 } 537 if (wi != WEOF) 538 __ungetwc(wi, fp); 539 if (!(flags & SUPPRESS)) { 540 *mbp = 0; 541 nassigned++; 542 } 543 } 544 nconversions++; 545 continue; 546 547 case CT_INT: 548 /* scan an integer as if by the conversion function */ 549#ifdef hardway 550 if (width == 0 || width > sizeof(buf) - 1) 551 width = sizeof(buf) - 1; 552#else 553 /* size_t is unsigned, hence this optimisation */ 554 if (--width > sizeof(buf) - 2) 555 width = sizeof(buf) - 2; 556 width++; 557#endif 558 flags |= SIGNOK | NDIGITS | NZDIGITS; 559 for (p = buf; width; width--) { 560 c = __fgetwc(fp); 561 /* 562 * Switch on the character; `goto ok' 563 * if we accept it as a part of number. 564 */ 565 switch (c) { 566 567 /* 568 * The digit 0 is always legal, but is 569 * special. For %i conversions, if no 570 * digits (zero or nonzero) have been 571 * scanned (only signs), we will have 572 * base==0. In that case, we should set 573 * it to 8 and enable 0x prefixing. 574 * Also, if we have not scanned zero digits 575 * before this, do not turn off prefixing 576 * (someone else will turn it off if we 577 * have scanned any nonzero digits). 578 */ 579 case '0': 580 if (base == 0) { 581 base = 8; 582 flags |= PFXOK; 583 } 584 if (flags & NZDIGITS) 585 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 586 else 587 flags &= ~(SIGNOK|PFXOK|NDIGITS); 588 goto ok; 589 590 /* 1 through 7 always legal */ 591 case '1': case '2': case '3': 592 case '4': case '5': case '6': case '7': 593 base = basefix[base]; 594 flags &= ~(SIGNOK | PFXOK | NDIGITS); 595 goto ok; 596 597 /* digits 8 and 9 ok iff decimal or hex */ 598 case '8': case '9': 599 base = basefix[base]; 600 if (base <= 8) 601 break; /* not legal here */ 602 flags &= ~(SIGNOK | PFXOK | NDIGITS); 603 goto ok; 604 605 /* letters ok iff hex */ 606 case 'A': case 'B': case 'C': 607 case 'D': case 'E': case 'F': 608 case 'a': case 'b': case 'c': 609 case 'd': case 'e': case 'f': 610 /* no need to fix base here */ 611 if (base <= 10) 612 break; /* not legal here */ 613 flags &= ~(SIGNOK | PFXOK | NDIGITS); 614 goto ok; 615 616 /* sign ok only as first character */ 617 case '+': case '-': 618 if (flags & SIGNOK) { 619 flags &= ~SIGNOK; 620 goto ok; 621 } 622 break; 623 624 /* x ok iff flag still set & 2nd char */ 625 case 'x': case 'X': 626 if (flags & PFXOK && p == buf + 1) { 627 base = 16; /* if %i */ 628 flags &= ~PFXOK; 629 goto ok; 630 } 631 break; 632 } 633 634 /* 635 * If we got here, c is not a legal character 636 * for a number. Stop accumulating digits. 637 */ 638 if (c != WEOF) 639 __ungetwc(c, fp); 640 break; 641 ok: 642 /* 643 * c is legal: store it and look at the next. 644 */ 645 *p++ = (wchar_t)c; 646 } 647 /* 648 * If we had only a sign, it is no good; push 649 * back the sign. If the number ends in `x', 650 * it was [sign] '0' 'x', so push back the x 651 * and treat it as [sign] '0'. 652 */ 653 if (flags & NDIGITS) { 654 if (p > buf) 655 __ungetwc(*--p, fp); 656 goto match_failure; 657 } 658 c = p[-1]; 659 if (c == 'x' || c == 'X') { 660 --p; 661 __ungetwc(c, fp); 662 } 663 if ((flags & SUPPRESS) == 0) { 664 uintmax_t res; 665 666 *p = 0; 667 if ((flags & UNSIGNED) == 0) 668 res = wcstoimax(buf, NULL, base); 669 else 670 res = wcstoumax(buf, NULL, base); 671 if (flags & POINTER) 672 *va_arg(ap, void **) = 673 (void *)(uintptr_t)res; 674 else if (flags & SHORTSHORT) 675 *va_arg(ap, char *) = res; 676 else if (flags & SHORT) 677 *va_arg(ap, short *) = res; 678 else if (flags & LONG) 679 *va_arg(ap, long *) = res; 680 else if (flags & LONGLONG) 681 *va_arg(ap, long long *) = res; 682 else if (flags & INTMAXT) 683 *va_arg(ap, intmax_t *) = res; 684 else if (flags & PTRDIFFT) 685 *va_arg(ap, ptrdiff_t *) = res; 686 else if (flags & SIZET) 687 *va_arg(ap, size_t *) = res; 688 else 689 *va_arg(ap, int *) = res; 690 nassigned++; 691 } 692 nread += p - buf; 693 nconversions++; 694 break; 695 696#ifdef FLOATING_POINT 697 case CT_FLOAT: 698 /* scan a floating point number as if by strtod */ 699#ifdef hardway 700 if (width == 0 || width > sizeof(buf) - 1) 701 width = sizeof(buf) - 1; 702#else 703 /* size_t is unsigned, hence this optimisation */ 704 if (--width > sizeof(buf) - 2) 705 width = sizeof(buf) - 2; 706 width++; 707#endif 708 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 709 for (p = buf; width; width--) { 710 c = __fgetwc(fp); 711 /* 712 * This code mimicks the integer conversion 713 * code, but is much simpler. 714 */ 715 switch (c) { 716 717 case '0': case '1': case '2': case '3': 718 case '4': case '5': case '6': case '7': 719 case '8': case '9': 720 flags &= ~(SIGNOK | NDIGITS); 721 goto fok; 722 723 case '+': case '-': 724 if (flags & SIGNOK) { 725 flags &= ~SIGNOK; 726 goto fok; 727 } 728 break; 729 case 'e': case 'E': 730 /* no exponent without some digits */ 731 if ((flags&(NDIGITS|EXPOK)) == EXPOK) { 732 flags = 733 (flags & ~(EXPOK|DPTOK)) | 734 SIGNOK | NDIGITS; 735 goto fok; 736 } 737 break; 738 default: 739 if (c == (wchar_t)decimal_point && 740 (flags & DPTOK)) { 741 flags &= ~(SIGNOK | DPTOK); 742 goto fok; 743 } 744 break; 745 } 746 if (c != WEOF) 747 __ungetwc(c, fp); 748 break; 749 fok: 750 *p++ = c; 751 } 752 /* 753 * If no digits, might be missing exponent digits 754 * (just give back the exponent) or might be missing 755 * regular digits, but had sign and/or decimal point. 756 */ 757 if (flags & NDIGITS) { 758 if (flags & EXPOK) { 759 /* no digits at all */ 760 while (p > buf) 761 __ungetwc(*--p, fp); 762 goto match_failure; 763 } 764 /* just a bad exponent (e and maybe sign) */ 765 c = *--p; 766 if (c != 'e' && c != 'E') { 767 __ungetwc(c, fp);/* sign */ 768 c = *--p; 769 } 770 __ungetwc(c, fp); 771 } 772 if ((flags & SUPPRESS) == 0) { 773 double res; 774 775 *p = 0; 776 /* XXX this loses precision for long doubles. */ 777 res = wcstod(buf, NULL); 778 if (flags & LONGDBL) 779 *va_arg(ap, long double *) = res; 780 else if (flags & LONG) 781 *va_arg(ap, double *) = res; 782 else 783 *va_arg(ap, float *) = res; 784 nassigned++; 785 } 786 nread += p - buf; 787 nconversions++; 788 break; 789#endif /* FLOATING_POINT */ 790 } 791 } 792input_failure: 793 return (nconversions != 0 ? nassigned : EOF); 794match_failure: 795 return (nassigned); 796} 797