vfwscanf.c revision 1.11
1 /* $NetBSD: vfwscanf.c,v 1.11 2013/09/23 12:41:37 pooka 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)ftell.c 8.2 (Berkeley) 5/4/95"; 43 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp $"); 44 #else 45 __RCSID("$NetBSD: vfwscanf.c,v 1.11 2013/09/23 12:41:37 pooka Exp $"); 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 #include "namespace.h" 50 #include <ctype.h> 51 #include <inttypes.h> 52 #include <assert.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <stddef.h> 56 #include <stdarg.h> 57 #include <string.h> 58 #include <limits.h> 59 #include <wchar.h> 60 #include <wctype.h> 61 62 #include "reentrant.h" 63 #include "local.h" 64 65 #include <locale.h> 66 #include "setlocale_local.h" 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: quad_t (+ 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 integral conversions only: 88 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS 89 */ 90 #define SIGNOK 0x40 /* +/- is (still) legal */ 91 #define NDIGITS 0x80 /* no digits detected */ 92 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 93 #define NZDIGITS 0x200 /* no zero digits detected */ 94 #define HAVESIGN 0x10000 /* sign detected */ 95 96 /* 97 * Conversion types. 98 */ 99 #define CT_CHAR 0 /* %c conversion */ 100 #define CT_CCL 1 /* %[...] conversion */ 101 #define CT_STRING 2 /* %s conversion */ 102 #define CT_INT 3 /* %[dioupxX] conversion */ 103 #define CT_FLOAT 4 /* %[efgEFG] conversion */ 104 105 #ifndef NO_FLOATING_POINT 106 static int parsefloat(FILE *, wchar_t *, wchar_t *, locale_t); 107 #endif 108 109 #define INCCL(_c) \ 110 (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \ 111 (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL)) 112 113 /* 114 * MT-safe version. 115 */ 116 int 117 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) 118 { 119 return vfwscanf_l(fp, _current_locale(), fmt, ap); 120 } 121 122 int 123 vfwscanf_l(FILE * __restrict fp, locale_t loc, const wchar_t * __restrict fmt, 124 va_list ap) 125 { 126 int ret; 127 128 FLOCKFILE(fp); 129 _SET_ORIENTATION(fp, 1); 130 ret = __vfwscanf_unlocked_l(fp, loc, fmt, ap); 131 FUNLOCKFILE(fp); 132 return ret; 133 } 134 135 #define SCANF_SKIP_SPACE() \ 136 do { \ 137 wint_t tc; \ 138 \ 139 while ((tc = __fgetwc_unlock(fp)) != WEOF && iswspace_l(tc, loc)) \ 140 continue; \ 141 if (tc != WEOF) \ 142 ungetwc(tc, fp); \ 143 } while (/*CONSTCOND*/ 0) 144 145 /* 146 * Non-MT-safe version. 147 */ 148 int 149 __vfwscanf_unlocked_l(FILE * __restrict fp, locale_t loc, 150 const wchar_t * __restrict fmt, va_list ap) 151 { 152 wint_t c; /* character from format, or conversion */ 153 size_t width; /* field width, or 0 */ 154 wchar_t *p; /* points into all kinds of strings */ 155 int n; /* handy integer */ 156 int flags; /* flags as defined above */ 157 wchar_t *p0; /* saves original value of p when necessary */ 158 int nassigned; /* number of fields assigned */ 159 int nconversions; /* number of conversions */ 160 size_t nread; /* number of characters consumed from fp */ 161 int base; /* base argument to conversion function */ 162 wchar_t buf[BUF]; /* buffer for numeric conversions */ 163 const wchar_t *ccls; /* character class start */ 164 const wchar_t *ccle; /* character class end */ 165 int cclcompl; /* ccl is complemented? */ 166 wint_t wi; /* handy wint_t */ 167 char *mbp; /* multibyte string pointer for %c %s %[ */ 168 size_t nconv; /* number of bytes in mb. conversion */ 169 static const mbstate_t initial; 170 mbstate_t mbs; 171 char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ 172 /* `basefix' is used to avoid `if' tests in the integer scanner */ 173 static short basefix[17] = 174 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 175 176 nassigned = 0; 177 nconversions = 0; 178 nread = 0; 179 ccls = ccle = NULL; 180 base = 0; 181 cclcompl = 0; 182 mbp = NULL; 183 for (;;) { 184 c = *fmt++; 185 if (c == 0) 186 return nassigned; 187 if (iswspace_l(c, loc)) { 188 while ((c = __fgetwc_unlock(fp)) != WEOF && 189 iswspace_l(c, loc)) 190 ; 191 if (c != WEOF) 192 ungetwc(c, fp); 193 continue; 194 } 195 if (c != '%') 196 goto literal; 197 width = 0; 198 flags = 0; 199 /* 200 * switch on the format. continue if done; 201 * break once format type is derived. 202 */ 203 again: c = *fmt++; 204 switch (c) { 205 case '%': 206 SCANF_SKIP_SPACE(); 207 literal: 208 if ((wi = __fgetwc_unlock(fp)) == WEOF) 209 goto input_failure; 210 if (wi != c) { 211 ungetwc(wi, fp); 212 goto input_failure; 213 } 214 nread++; 215 continue; 216 217 case '*': 218 flags |= SUPPRESS; 219 goto again; 220 case 'j': 221 flags |= INTMAXT; 222 goto again; 223 case 'l': 224 if (flags & LONG) { 225 flags &= ~LONG; 226 flags |= LONGLONG; 227 } else 228 flags |= LONG; 229 goto again; 230 case 'q': 231 flags |= LONGLONG; /* not quite */ 232 goto again; 233 case 't': 234 flags |= PTRDIFFT; 235 goto again; 236 case 'z': 237 flags |= SIZET; 238 goto again; 239 case 'L': 240 flags |= LONGDBL; 241 goto again; 242 case 'h': 243 if (flags & SHORT) { 244 flags &= ~SHORT; 245 flags |= SHORTSHORT; 246 } else 247 flags |= SHORT; 248 goto again; 249 250 case '0': case '1': case '2': case '3': case '4': 251 case '5': case '6': case '7': case '8': case '9': 252 width = width * 10 + c - '0'; 253 goto again; 254 255 /* 256 * Conversions. 257 */ 258 case 'd': 259 c = CT_INT; 260 base = 10; 261 break; 262 263 case 'i': 264 c = CT_INT; 265 base = 0; 266 break; 267 268 case 'o': 269 c = CT_INT; 270 flags |= UNSIGNED; 271 base = 8; 272 break; 273 274 case 'u': 275 c = CT_INT; 276 flags |= UNSIGNED; 277 base = 10; 278 break; 279 280 case 'X': 281 case 'x': 282 flags |= PFXOK; /* enable 0x prefixing */ 283 c = CT_INT; 284 flags |= UNSIGNED; 285 base = 16; 286 break; 287 288 #ifndef NO_FLOATING_POINT 289 case 'A': case 'E': case 'F': case 'G': 290 case 'a': case 'e': case 'f': case 'g': 291 c = CT_FLOAT; 292 break; 293 #endif 294 295 case 'S': 296 flags |= LONG; 297 /* FALLTHROUGH */ 298 case 's': 299 c = CT_STRING; 300 break; 301 302 case '[': 303 ccls = fmt; 304 if (*fmt == '^') { 305 cclcompl = 1; 306 fmt++; 307 } else 308 cclcompl = 0; 309 if (*fmt == ']') 310 fmt++; 311 while (*fmt != '\0' && *fmt != ']') 312 fmt++; 313 ccle = fmt; 314 fmt++; 315 flags |= NOSKIP; 316 c = CT_CCL; 317 break; 318 319 case 'C': 320 flags |= LONG; 321 /* FALLTHROUGH */ 322 case 'c': 323 flags |= NOSKIP; 324 c = CT_CHAR; 325 break; 326 327 case 'p': /* pointer format is like hex */ 328 flags |= POINTER | PFXOK; 329 c = CT_INT; /* assumes sizeof(uintmax_t) */ 330 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 331 base = 16; 332 break; 333 334 case 'n': 335 nconversions++; 336 if (flags & SUPPRESS) /* ??? */ 337 continue; 338 if (flags & SHORTSHORT) 339 *va_arg(ap, char *) = (char)nread; 340 else if (flags & SHORT) 341 *va_arg(ap, short *) = (short)nread; 342 else if (flags & LONG) 343 *va_arg(ap, long *) = nread; 344 else if (flags & LONGLONG) 345 *va_arg(ap, quad_t *) = nread; 346 else if (flags & INTMAXT) 347 *va_arg(ap, intmax_t *) = nread; 348 else if (flags & SIZET) 349 *va_arg(ap, size_t *) = nread; 350 else if (flags & PTRDIFFT) 351 *va_arg(ap, ptrdiff_t *) = nread; 352 else 353 *va_arg(ap, int *) = (int)nread; 354 continue; 355 356 default: 357 goto match_failure; 358 359 /* 360 * Disgusting backwards compatibility hack. XXX 361 */ 362 case '\0': /* compat */ 363 return EOF; 364 } 365 366 /* 367 * Consume leading white space, except for formats 368 * that suppress this. 369 */ 370 if ((flags & NOSKIP) == 0) { 371 while ((wi = __fgetwc_unlock(fp)) != WEOF && 372 iswspace_l(wi, loc)) 373 nread++; 374 if (wi == WEOF) 375 goto input_failure; 376 ungetwc(wi, fp); 377 } 378 379 /* 380 * Do the conversion. 381 */ 382 switch (c) { 383 384 case CT_CHAR: 385 /* scan arbitrary characters (sets NOSKIP) */ 386 if (width == 0) 387 width = 1; 388 if (flags & LONG) { 389 if (!(flags & SUPPRESS)) 390 p = va_arg(ap, wchar_t *); 391 n = 0; 392 while (width-- != 0 && 393 (wi = __fgetwc_unlock(fp)) != WEOF) { 394 if (!(flags & SUPPRESS)) 395 *p++ = (wchar_t)wi; 396 n++; 397 } 398 if (n == 0) 399 goto input_failure; 400 nread += n; 401 if (!(flags & SUPPRESS)) 402 nassigned++; 403 } else { 404 if (!(flags & SUPPRESS)) 405 mbp = va_arg(ap, char *); 406 n = 0; 407 mbs = initial; 408 while (width != 0 && 409 (wi = __fgetwc_unlock(fp)) != WEOF) { 410 if (width >= MB_CUR_MAX_L(loc) && 411 !(flags & SUPPRESS)) { 412 nconv = wcrtomb_l(mbp, wi, 413 &mbs, loc); 414 if (nconv == (size_t)-1) 415 goto input_failure; 416 } else { 417 nconv = wcrtomb_l(mbbuf, wi, 418 &mbs, loc); 419 if (nconv == (size_t)-1) 420 goto input_failure; 421 if (nconv > width) { 422 ungetwc(wi, fp); 423 break; 424 } 425 if (!(flags & SUPPRESS)) 426 memcpy(mbp, mbbuf, 427 nconv); 428 } 429 if (!(flags & SUPPRESS)) 430 mbp += nconv; 431 width -= nconv; 432 n++; 433 } 434 if (n == 0) 435 goto input_failure; 436 nread += n; 437 if (!(flags & SUPPRESS)) 438 nassigned++; 439 } 440 nconversions++; 441 break; 442 443 case CT_CCL: 444 /* scan a (nonempty) character class (sets NOSKIP) */ 445 if (width == 0) 446 width = (size_t)~0; /* `infinity' */ 447 /* take only those things in the class */ 448 if ((flags & SUPPRESS) && (flags & LONG)) { 449 n = 0; 450 while ((wi = __fgetwc_unlock(fp)) != WEOF && 451 width-- != 0 && INCCL(wi)) 452 n++; 453 if (wi != WEOF) 454 ungetwc(wi, fp); 455 if (n == 0) 456 goto match_failure; 457 } else if (flags & LONG) { 458 p0 = p = va_arg(ap, wchar_t *); 459 while ((wi = __fgetwc_unlock(fp)) != WEOF && 460 width-- != 0 && INCCL(wi)) 461 *p++ = (wchar_t)wi; 462 if (wi != WEOF) 463 ungetwc(wi, fp); 464 _DIAGASSERT(__type_fit(int, p - p0)); 465 n = (int)(p - p0); 466 if (n == 0) 467 goto match_failure; 468 *p = 0; 469 nassigned++; 470 } else { 471 if (!(flags & SUPPRESS)) 472 mbp = va_arg(ap, char *); 473 n = 0; 474 mbs = initial; 475 while ((wi = __fgetwc_unlock(fp)) != WEOF && 476 width != 0 && INCCL(wi)) { 477 if (width >= MB_CUR_MAX_L(loc) && 478 !(flags & SUPPRESS)) { 479 nconv = wcrtomb_l(mbp, wi, 480 &mbs, loc); 481 if (nconv == (size_t)-1) 482 goto input_failure; 483 } else { 484 nconv = wcrtomb_l(mbbuf, wi, 485 &mbs, loc); 486 if (nconv == (size_t)-1) 487 goto input_failure; 488 if (nconv > width) 489 break; 490 if (!(flags & SUPPRESS)) 491 memcpy(mbp, mbbuf, 492 nconv); 493 } 494 if (!(flags & SUPPRESS)) 495 mbp += nconv; 496 width -= nconv; 497 n++; 498 } 499 if (wi != WEOF) 500 ungetwc(wi, fp); 501 if (!(flags & SUPPRESS)) { 502 *mbp = 0; 503 nassigned++; 504 } 505 } 506 nread += n; 507 nconversions++; 508 break; 509 510 case CT_STRING: 511 /* like CCL, but zero-length string OK, & no NOSKIP */ 512 if (width == 0) 513 width = (size_t)~0; 514 if ((flags & SUPPRESS) && (flags & LONG)) { 515 while ((wi = __fgetwc_unlock(fp)) != WEOF && 516 width-- != 0 && 517 !iswspace_l(wi, loc)) 518 nread++; 519 if (wi != WEOF) 520 ungetwc(wi, fp); 521 } else if (flags & LONG) { 522 p0 = p = va_arg(ap, wchar_t *); 523 while ((wi = __fgetwc_unlock(fp)) != WEOF && 524 width-- != 0 && 525 !iswspace_l(wi, loc)) { 526 *p++ = (wchar_t)wi; 527 nread++; 528 } 529 if (wi != WEOF) 530 ungetwc(wi, fp); 531 *p = '\0'; 532 nassigned++; 533 } else { 534 if (!(flags & SUPPRESS)) 535 mbp = va_arg(ap, char *); 536 mbs = initial; 537 while ((wi = __fgetwc_unlock(fp)) != WEOF && 538 width != 0 && 539 !iswspace_l(wi, loc)) { 540 if (width >= MB_CUR_MAX_L(loc) && 541 !(flags & SUPPRESS)) { 542 nconv = wcrtomb_l(mbp, wi, 543 &mbs, loc); 544 if (nconv == (size_t)-1) 545 goto input_failure; 546 } else { 547 nconv = wcrtomb_l(mbbuf, wi, 548 &mbs, loc); 549 if (nconv == (size_t)-1) 550 goto input_failure; 551 if (nconv > width) 552 break; 553 if (!(flags & SUPPRESS)) 554 memcpy(mbp, mbbuf, 555 nconv); 556 } 557 if (!(flags & SUPPRESS)) 558 mbp += nconv; 559 width -= nconv; 560 nread++; 561 } 562 if (wi != WEOF) 563 ungetwc(wi, fp); 564 if (!(flags & SUPPRESS)) { 565 *mbp = 0; 566 nassigned++; 567 } 568 } 569 nconversions++; 570 continue; 571 572 case CT_INT: 573 /* scan an integer as if by the conversion function */ 574 if (width == 0 || width > sizeof(buf) / 575 sizeof(*buf) - 1) 576 width = sizeof(buf) / sizeof(*buf) - 1; 577 flags |= SIGNOK | NDIGITS | NZDIGITS; 578 for (p = buf; width; width--) { 579 c = __fgetwc_unlock(fp); 580 /* 581 * Switch on the character; `goto ok' 582 * if we accept it as a part of number. 583 */ 584 switch (c) { 585 586 /* 587 * The digit 0 is always legal, but is 588 * special. For %i conversions, if no 589 * digits (zero or nonzero) have been 590 * scanned (only signs), we will have 591 * base==0. In that case, we should set 592 * it to 8 and enable 0x prefixing. 593 * Also, if we have not scanned zero digits 594 * before this, do not turn off prefixing 595 * (someone else will turn it off if we 596 * have scanned any nonzero digits). 597 */ 598 case '0': 599 if (base == 0) { 600 base = 8; 601 flags |= PFXOK; 602 } 603 if (flags & NZDIGITS) 604 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 605 else 606 flags &= ~(SIGNOK|PFXOK|NDIGITS); 607 goto ok; 608 609 /* 1 through 7 always legal */ 610 case '1': case '2': case '3': 611 case '4': case '5': case '6': case '7': 612 base = basefix[base]; 613 flags &= ~(SIGNOK | PFXOK | NDIGITS); 614 goto ok; 615 616 /* digits 8 and 9 ok iff decimal or hex */ 617 case '8': case '9': 618 base = basefix[base]; 619 if (base <= 8) 620 break; /* not legal here */ 621 flags &= ~(SIGNOK | PFXOK | NDIGITS); 622 goto ok; 623 624 /* letters ok iff hex */ 625 case 'A': case 'B': case 'C': 626 case 'D': case 'E': case 'F': 627 case 'a': case 'b': case 'c': 628 case 'd': case 'e': case 'f': 629 /* no need to fix base here */ 630 if (base <= 10) 631 break; /* not legal here */ 632 flags &= ~(SIGNOK | PFXOK | NDIGITS); 633 goto ok; 634 635 /* sign ok only as first character */ 636 case '+': case '-': 637 if (flags & SIGNOK) { 638 flags &= ~SIGNOK; 639 flags |= HAVESIGN; 640 goto ok; 641 } 642 break; 643 644 /* 645 * x ok iff flag still set & 2nd char (or 646 * 3rd char if we have a sign). 647 */ 648 case 'x': case 'X': 649 if (flags & PFXOK && p == 650 buf + 1 + !!(flags & HAVESIGN)) { 651 base = 16; /* if %i */ 652 flags &= ~PFXOK; 653 goto ok; 654 } 655 break; 656 } 657 658 /* 659 * If we got here, c is not a legal character 660 * for a number. Stop accumulating digits. 661 */ 662 if (c != WEOF) 663 ungetwc(c, fp); 664 break; 665 ok: 666 /* 667 * c is legal: store it and look at the next. 668 */ 669 *p++ = (wchar_t)c; 670 } 671 /* 672 * If we had only a sign, it is no good; push 673 * back the sign. If the number ends in `x', 674 * it was [sign] '0' 'x', so push back the x 675 * and treat it as [sign] '0'. 676 */ 677 if (flags & NDIGITS) { 678 if (p > buf) 679 ungetwc(*--p, fp); 680 goto match_failure; 681 } 682 c = p[-1]; 683 if (c == 'x' || c == 'X') { 684 --p; 685 ungetwc(c, fp); 686 } 687 if ((flags & SUPPRESS) == 0) { 688 uintmax_t res; 689 690 *p = 0; 691 if ((flags & UNSIGNED) == 0) 692 res = wcstoimax_l(buf, NULL, base, loc); 693 else 694 res = wcstoumax_l(buf, NULL, base, loc); 695 if (flags & POINTER) 696 *va_arg(ap, void **) = 697 (void *)(uintptr_t)res; 698 else if (flags & SHORTSHORT) 699 *va_arg(ap, char *) = (char)res; 700 else if (flags & SHORT) 701 *va_arg(ap, short *) = (short)res; 702 else if (flags & LONG) 703 *va_arg(ap, long *) = (long)res; 704 else if (flags & LONGLONG) 705 *va_arg(ap, quad_t *) = res; 706 else if (flags & INTMAXT) 707 *va_arg(ap, intmax_t *) = res; 708 else if (flags & PTRDIFFT) 709 *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res; 710 else if (flags & SIZET) 711 *va_arg(ap, size_t *) = (size_t)res; 712 else 713 *va_arg(ap, int *) = (int)res; 714 nassigned++; 715 } 716 _DIAGASSERT(__type_fit(int, p - buf)); 717 nread += (int)(p - buf); 718 nconversions++; 719 break; 720 721 #ifndef NO_FLOATING_POINT 722 case CT_FLOAT: 723 /* scan a floating point number as if by strtod */ 724 if (width == 0 || width > sizeof(buf) / 725 sizeof(*buf) - 1) 726 width = sizeof(buf) / sizeof(*buf) - 1; 727 if ((width = parsefloat(fp, buf, buf + width, loc)) == 0) 728 goto match_failure; 729 if ((flags & SUPPRESS) == 0) { 730 if (flags & LONGDBL) { 731 long double res = wcstold_l(buf, &p, 732 loc); 733 *va_arg(ap, long double *) = res; 734 } else 735 if (flags & LONG) { 736 double res = wcstod_l(buf, &p, loc); 737 *va_arg(ap, double *) = res; 738 } else { 739 float res = wcstof_l(buf, &p, loc); 740 *va_arg(ap, float *) = res; 741 } 742 #ifdef DEBUG 743 if (p - buf != (ptrdiff_t)width) 744 abort(); 745 #endif 746 nassigned++; 747 } 748 nread += width; 749 nconversions++; 750 break; 751 #endif /* !NO_FLOATING_POINT */ 752 } 753 } 754 input_failure: 755 return nconversions != 0 ? nassigned : EOF; 756 match_failure: 757 return nassigned; 758 } 759 760 #ifndef NO_FLOATING_POINT 761 static int 762 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t loc) 763 { 764 wchar_t *commit, *p; 765 int infnanpos = 0; 766 enum { 767 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX, 768 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS 769 } state = S_START; 770 wchar_t c; 771 wchar_t decpt = (wchar_t)(unsigned char)*localeconv_l(loc)->decimal_point; 772 int gotmantdig = 0, ishex = 0; 773 774 /* 775 * We set commit = p whenever the string we have read so far 776 * constitutes a valid representation of a floating point 777 * number by itself. At some point, the parse will complete 778 * or fail, and we will ungetc() back to the last commit point. 779 * To ensure that the file offset gets updated properly, it is 780 * always necessary to read at least one character that doesn't 781 * match; thus, we can't short-circuit "infinity" or "nan(...)". 782 */ 783 commit = buf - 1; 784 c = WEOF; 785 for (p = buf; p < end; ) { 786 if ((c = __fgetwc_unlock(fp)) == WEOF) 787 break; 788 reswitch: 789 switch (state) { 790 case S_START: 791 state = S_GOTSIGN; 792 if (c == '-' || c == '+') 793 break; 794 else 795 goto reswitch; 796 case S_GOTSIGN: 797 switch (c) { 798 case '0': 799 state = S_MAYBEHEX; 800 commit = p; 801 break; 802 case 'I': 803 case 'i': 804 state = S_INF; 805 break; 806 case 'N': 807 case 'n': 808 state = S_NAN; 809 break; 810 default: 811 state = S_DIGITS; 812 goto reswitch; 813 } 814 break; 815 case S_INF: 816 if (infnanpos > 6 || 817 (c != "nfinity"[infnanpos] && 818 c != "NFINITY"[infnanpos])) 819 goto parsedone; 820 if (infnanpos == 1 || infnanpos == 6) 821 commit = p; /* inf or infinity */ 822 infnanpos++; 823 break; 824 case S_NAN: 825 switch (infnanpos) { 826 case -1: /* XXX kludge to deal with nan(...) */ 827 goto parsedone; 828 case 0: 829 if (c != 'A' && c != 'a') 830 goto parsedone; 831 break; 832 case 1: 833 if (c != 'N' && c != 'n') 834 goto parsedone; 835 else 836 commit = p; 837 break; 838 case 2: 839 if (c != '(') 840 goto parsedone; 841 break; 842 default: 843 if (c == ')') { 844 commit = p; 845 infnanpos = -2; 846 } else if (!iswalnum_l(c, loc) && c != '_') 847 goto parsedone; 848 break; 849 } 850 infnanpos++; 851 break; 852 case S_MAYBEHEX: 853 state = S_DIGITS; 854 if (c == 'X' || c == 'x') { 855 ishex = 1; 856 break; 857 } else { /* we saw a '0', but no 'x' */ 858 gotmantdig = 1; 859 goto reswitch; 860 } 861 case S_DIGITS: 862 if ((ishex && iswxdigit_l(c, loc)) || 863 iswdigit_l(c, loc)) 864 gotmantdig = 1; 865 else { 866 state = S_FRAC; 867 if (c != decpt) 868 goto reswitch; 869 } 870 if (gotmantdig) 871 commit = p; 872 break; 873 case S_FRAC: 874 if (((c == 'E' || c == 'e') && !ishex) || 875 ((c == 'P' || c == 'p') && ishex)) { 876 if (!gotmantdig) 877 goto parsedone; 878 else 879 state = S_EXP; 880 } else if ((ishex && iswxdigit_l(c, loc)) || 881 iswdigit_l(c, loc)) { 882 commit = p; 883 gotmantdig = 1; 884 } else 885 goto parsedone; 886 break; 887 case S_EXP: 888 state = S_EXPDIGITS; 889 if (c == '-' || c == '+') 890 break; 891 else 892 goto reswitch; 893 case S_EXPDIGITS: 894 if (iswdigit_l(c, loc)) 895 commit = p; 896 else 897 goto parsedone; 898 break; 899 default: 900 abort(); 901 } 902 *p++ = c; 903 c = WEOF; 904 } 905 906 parsedone: 907 if (c != WEOF) 908 ungetwc(c, fp); 909 while (commit < --p) 910 ungetwc(*p, fp); 911 *++commit = '\0'; 912 _DIAGASSERT(__type_fit(int, commit - buf)); 913 return (int)(commit - buf); 914 } 915 #endif 916
Indexes created Tue Sep 23 02:09:52 GMT 2025