1 /* $NetBSD: vfwscanf.c,v 1.13 2022/04/19 20:32:16 rillig 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 1.13 2022/04/19 20:32:16 rillig 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 (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 p = NULL; /* XXXgcc */ 184 for (;;) { 185 c = *fmt++; 186 if (c == 0) 187 return nassigned; 188 if (iswspace_l(c, loc)) { 189 while ((c = __fgetwc_unlock(fp)) != WEOF && 190 iswspace_l(c, loc)) 191 ; 192 if (c != WEOF) 193 ungetwc(c, fp); 194 continue; 195 } 196 if (c != '%') 197 goto literal; 198 width = 0; 199 flags = 0; 200 /* 201 * switch on the format. continue if done; 202 * break once format type is derived. 203 */ 204 again: c = *fmt++; 205 switch (c) { 206 case '%': 207 SCANF_SKIP_SPACE(); 208 literal: 209 if ((wi = __fgetwc_unlock(fp)) == WEOF) 210 goto input_failure; 211 if (wi != c) { 212 ungetwc(wi, fp); 213 goto input_failure; 214 } 215 nread++; 216 continue; 217 218 case '*': 219 flags |= SUPPRESS; 220 goto again; 221 case 'j': 222 flags |= INTMAXT; 223 goto again; 224 case 'l': 225 if (flags & LONG) { 226 flags &= ~LONG; 227 flags |= LONGLONG; 228 } else 229 flags |= LONG; 230 goto again; 231 case 'q': 232 flags |= LONGLONG; /* not quite */ 233 goto again; 234 case 't': 235 flags |= PTRDIFFT; 236 goto again; 237 case 'z': 238 flags |= SIZET; 239 goto again; 240 case 'L': 241 flags |= LONGDBL; 242 goto again; 243 case 'h': 244 if (flags & SHORT) { 245 flags &= ~SHORT; 246 flags |= SHORTSHORT; 247 } else 248 flags |= SHORT; 249 goto again; 250 251 case '0': case '1': case '2': case '3': case '4': 252 case '5': case '6': case '7': case '8': case '9': 253 width = width * 10 + c - '0'; 254 goto again; 255 256 /* 257 * Conversions. 258 */ 259 case 'd': 260 c = CT_INT; 261 base = 10; 262 break; 263 264 case 'i': 265 c = CT_INT; 266 base = 0; 267 break; 268 269 case 'o': 270 c = CT_INT; 271 flags |= UNSIGNED; 272 base = 8; 273 break; 274 275 case 'u': 276 c = CT_INT; 277 flags |= UNSIGNED; 278 base = 10; 279 break; 280 281 case 'X': 282 case 'x': 283 flags |= PFXOK; /* enable 0x prefixing */ 284 c = CT_INT; 285 flags |= UNSIGNED; 286 base = 16; 287 break; 288 289 #ifndef NO_FLOATING_POINT 290 case 'A': case 'E': case 'F': case 'G': 291 case 'a': case 'e': case 'f': case 'g': 292 c = CT_FLOAT; 293 break; 294 #endif 295 296 case 'S': 297 flags |= LONG; 298 /* FALLTHROUGH */ 299 case 's': 300 c = CT_STRING; 301 break; 302 303 case '[': 304 ccls = fmt; 305 if (*fmt == '^') { 306 cclcompl = 1; 307 fmt++; 308 } else 309 cclcompl = 0; 310 if (*fmt == ']') 311 fmt++; 312 while (*fmt != '\0' && *fmt != ']') 313 fmt++; 314 ccle = fmt; 315 fmt++; 316 flags |= NOSKIP; 317 c = CT_CCL; 318 break; 319 320 case 'C': 321 flags |= LONG; 322 /* FALLTHROUGH */ 323 case 'c': 324 flags |= NOSKIP; 325 c = CT_CHAR; 326 break; 327 328 case 'p': /* pointer format is like hex */ 329 flags |= POINTER | PFXOK; 330 c = CT_INT; /* assumes sizeof(uintmax_t) */ 331 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 332 base = 16; 333 break; 334 335 case 'n': 336 nconversions++; 337 if (flags & SUPPRESS) /* ??? */ 338 continue; 339 if (flags & SHORTSHORT) 340 *va_arg(ap, char *) = (char)nread; 341 else if (flags & SHORT) 342 *va_arg(ap, short *) = (short)nread; 343 else if (flags & LONG) 344 *va_arg(ap, long *) = nread; 345 else if (flags & LONGLONG) 346 *va_arg(ap, quad_t *) = nread; 347 else if (flags & INTMAXT) 348 *va_arg(ap, intmax_t *) = nread; 349 else if (flags & SIZET) 350 *va_arg(ap, size_t *) = nread; 351 else if (flags & PTRDIFFT) 352 *va_arg(ap, ptrdiff_t *) = nread; 353 else 354 *va_arg(ap, int *) = (int)nread; 355 continue; 356 357 default: 358 goto match_failure; 359 360 /* 361 * Disgusting backwards compatibility hack. XXX 362 */ 363 case '\0': /* compat */ 364 return EOF; 365 } 366 367 /* 368 * Consume leading white space, except for formats 369 * that suppress this. 370 */ 371 if ((flags & NOSKIP) == 0) { 372 while ((wi = __fgetwc_unlock(fp)) != WEOF && 373 iswspace_l(wi, loc)) 374 nread++; 375 if (wi == WEOF) 376 goto input_failure; 377 ungetwc(wi, fp); 378 } 379 380 /* 381 * Do the conversion. 382 */ 383 switch (c) { 384 385 case CT_CHAR: 386 /* scan arbitrary characters (sets NOSKIP) */ 387 if (width == 0) 388 width = 1; 389 if (flags & LONG) { 390 if (!(flags & SUPPRESS)) 391 p = va_arg(ap, wchar_t *); 392 n = 0; 393 while (width-- != 0 && 394 (wi = __fgetwc_unlock(fp)) != WEOF) { 395 if (!(flags & SUPPRESS)) 396 *p++ = (wchar_t)wi; 397 n++; 398 } 399 if (n == 0) 400 goto input_failure; 401 nread += n; 402 if (!(flags & SUPPRESS)) 403 nassigned++; 404 } else { 405 if (!(flags & SUPPRESS)) 406 mbp = va_arg(ap, char *); 407 n = 0; 408 mbs = initial; 409 while (width != 0 && 410 (wi = __fgetwc_unlock(fp)) != WEOF) { 411 if (width >= MB_CUR_MAX_L(loc) && 412 !(flags & SUPPRESS)) { 413 nconv = wcrtomb_l(mbp, wi, 414 &mbs, loc); 415 if (nconv == (size_t)-1) 416 goto input_failure; 417 } else { 418 nconv = wcrtomb_l(mbbuf, wi, 419 &mbs, loc); 420 if (nconv == (size_t)-1) 421 goto input_failure; 422 if (nconv > width) { 423 ungetwc(wi, fp); 424 break; 425 } 426 if (!(flags & SUPPRESS)) 427 memcpy(mbp, mbbuf, 428 nconv); 429 } 430 if (!(flags & SUPPRESS)) 431 mbp += nconv; 432 width -= nconv; 433 n++; 434 } 435 if (n == 0) 436 goto input_failure; 437 nread += n; 438 if (!(flags & SUPPRESS)) 439 nassigned++; 440 } 441 nconversions++; 442 break; 443 444 case CT_CCL: 445 /* scan a (nonempty) character class (sets NOSKIP) */ 446 if (width == 0) 447 width = (size_t)~0; /* `infinity' */ 448 /* take only those things in the class */ 449 if ((flags & SUPPRESS) && (flags & LONG)) { 450 n = 0; 451 while ((wi = __fgetwc_unlock(fp)) != WEOF && 452 width-- != 0 && INCCL(wi)) 453 n++; 454 if (wi != WEOF) 455 ungetwc(wi, fp); 456 if (n == 0) 457 goto match_failure; 458 } else if (flags & LONG) { 459 p0 = p = va_arg(ap, wchar_t *); 460 while ((wi = __fgetwc_unlock(fp)) != WEOF && 461 width-- != 0 && INCCL(wi)) 462 *p++ = (wchar_t)wi; 463 if (wi != WEOF) 464 ungetwc(wi, fp); 465 _DIAGASSERT(__type_fit(int, p - p0)); 466 n = (int)(p - p0); 467 if (n == 0) 468 goto match_failure; 469 *p = 0; 470 nassigned++; 471 } else { 472 if (!(flags & SUPPRESS)) 473 mbp = va_arg(ap, char *); 474 n = 0; 475 mbs = initial; 476 while ((wi = __fgetwc_unlock(fp)) != WEOF && 477 width != 0 && INCCL(wi)) { 478 if (width >= MB_CUR_MAX_L(loc) && 479 !(flags & SUPPRESS)) { 480 nconv = wcrtomb_l(mbp, wi, 481 &mbs, loc); 482 if (nconv == (size_t)-1) 483 goto input_failure; 484 } else { 485 nconv = wcrtomb_l(mbbuf, wi, 486 &mbs, loc); 487 if (nconv == (size_t)-1) 488 goto input_failure; 489 if (nconv > width) 490 break; 491 if (!(flags & SUPPRESS)) 492 memcpy(mbp, mbbuf, 493 nconv); 494 } 495 if (!(flags & SUPPRESS)) 496 mbp += nconv; 497 width -= nconv; 498 n++; 499 } 500 if (wi != WEOF) 501 ungetwc(wi, fp); 502 if (!(flags & SUPPRESS)) { 503 *mbp = 0; 504 nassigned++; 505 } 506 } 507 nread += n; 508 nconversions++; 509 break; 510 511 case CT_STRING: 512 /* like CCL, but zero-length string OK, & no NOSKIP */ 513 if (width == 0) 514 width = (size_t)~0; 515 if ((flags & SUPPRESS) && (flags & LONG)) { 516 while ((wi = __fgetwc_unlock(fp)) != WEOF && 517 width-- != 0 && 518 !iswspace_l(wi, loc)) 519 nread++; 520 if (wi != WEOF) 521 ungetwc(wi, fp); 522 } else if (flags & LONG) { 523 p0 = p = va_arg(ap, wchar_t *); 524 while ((wi = __fgetwc_unlock(fp)) != WEOF && 525 width-- != 0 && 526 !iswspace_l(wi, loc)) { 527 *p++ = (wchar_t)wi; 528 nread++; 529 } 530 if (wi != WEOF) 531 ungetwc(wi, fp); 532 *p = '\0'; 533 nassigned++; 534 } else { 535 if (!(flags & SUPPRESS)) 536 mbp = va_arg(ap, char *); 537 mbs = initial; 538 while ((wi = __fgetwc_unlock(fp)) != WEOF && 539 width != 0 && 540 !iswspace_l(wi, loc)) { 541 if (width >= MB_CUR_MAX_L(loc) && 542 !(flags & SUPPRESS)) { 543 nconv = wcrtomb_l(mbp, wi, 544 &mbs, loc); 545 if (nconv == (size_t)-1) 546 goto input_failure; 547 } else { 548 nconv = wcrtomb_l(mbbuf, wi, 549 &mbs, loc); 550 if (nconv == (size_t)-1) 551 goto input_failure; 552 if (nconv > width) 553 break; 554 if (!(flags & SUPPRESS)) 555 memcpy(mbp, mbbuf, 556 nconv); 557 } 558 if (!(flags & SUPPRESS)) 559 mbp += nconv; 560 width -= nconv; 561 nread++; 562 } 563 if (wi != WEOF) 564 ungetwc(wi, fp); 565 if (!(flags & SUPPRESS)) { 566 *mbp = 0; 567 nassigned++; 568 } 569 } 570 nconversions++; 571 continue; 572 573 case CT_INT: 574 /* scan an integer as if by the conversion function */ 575 if (width == 0 || width > sizeof(buf) / 576 sizeof(*buf) - 1) 577 width = sizeof(buf) / sizeof(*buf) - 1; 578 flags |= SIGNOK | NDIGITS | NZDIGITS; 579 for (p = buf; width; width--) { 580 c = __fgetwc_unlock(fp); 581 /* 582 * Switch on the character; `goto ok' 583 * if we accept it as a part of number. 584 */ 585 switch (c) { 586 587 /* 588 * The digit 0 is always legal, but is 589 * special. For %i conversions, if no 590 * digits (zero or nonzero) have been 591 * scanned (only signs), we will have 592 * base==0. In that case, we should set 593 * it to 8 and enable 0x prefixing. 594 * Also, if we have not scanned zero digits 595 * before this, do not turn off prefixing 596 * (someone else will turn it off if we 597 * have scanned any nonzero digits). 598 */ 599 case '0': 600 if (base == 0) { 601 base = 8; 602 flags |= PFXOK; 603 } 604 if (flags & NZDIGITS) 605 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 606 else 607 flags &= ~(SIGNOK|PFXOK|NDIGITS); 608 goto ok; 609 610 /* 1 through 7 always legal */ 611 case '1': case '2': case '3': 612 case '4': case '5': case '6': case '7': 613 base = basefix[base]; 614 flags &= ~(SIGNOK | PFXOK | NDIGITS); 615 goto ok; 616 617 /* digits 8 and 9 ok iff decimal or hex */ 618 case '8': case '9': 619 base = basefix[base]; 620 if (base <= 8) 621 break; /* not legal here */ 622 flags &= ~(SIGNOK | PFXOK | NDIGITS); 623 goto ok; 624 625 /* letters ok iff hex */ 626 case 'A': case 'B': case 'C': 627 case 'D': case 'E': case 'F': 628 case 'a': case 'b': case 'c': 629 case 'd': case 'e': case 'f': 630 /* no need to fix base here */ 631 if (base <= 10) 632 break; /* not legal here */ 633 flags &= ~(SIGNOK | PFXOK | NDIGITS); 634 goto ok; 635 636 /* sign ok only as first character */ 637 case '+': case '-': 638 if (flags & SIGNOK) { 639 flags &= ~SIGNOK; 640 flags |= HAVESIGN; 641 goto ok; 642 } 643 break; 644 645 /* 646 * x ok iff flag still set & 2nd char (or 647 * 3rd char if we have a sign). 648 */ 649 case 'x': case 'X': 650 if (flags & PFXOK && p == 651 buf + 1 + !!(flags & HAVESIGN)) { 652 base = 16; /* if %i */ 653 flags &= ~PFXOK; 654 goto ok; 655 } 656 break; 657 } 658 659 /* 660 * If we got here, c is not a legal character 661 * for a number. Stop accumulating digits. 662 */ 663 if (c != WEOF) 664 ungetwc(c, fp); 665 break; 666 ok: 667 /* 668 * c is legal: store it and look at the next. 669 */ 670 *p++ = (wchar_t)c; 671 } 672 /* 673 * If we had only a sign, it is no good; push 674 * back the sign. If the number ends in `x', 675 * it was [sign] '0' 'x', so push back the x 676 * and treat it as [sign] '0'. 677 */ 678 if (flags & NDIGITS) { 679 if (p > buf) 680 ungetwc(*--p, fp); 681 goto match_failure; 682 } 683 c = p[-1]; 684 if (c == 'x' || c == 'X') { 685 --p; 686 ungetwc(c, fp); 687 } 688 if ((flags & SUPPRESS) == 0) { 689 uintmax_t res; 690 691 *p = 0; 692 if ((flags & UNSIGNED) == 0) 693 res = wcstoimax_l(buf, NULL, base, loc); 694 else 695 res = wcstoumax_l(buf, NULL, base, loc); 696 if (flags & POINTER) 697 *va_arg(ap, void **) = 698 (void *)(uintptr_t)res; 699 else if (flags & SHORTSHORT) 700 *va_arg(ap, char *) = (char)res; 701 else if (flags & SHORT) 702 *va_arg(ap, short *) = (short)res; 703 else if (flags & LONG) 704 *va_arg(ap, long *) = (long)res; 705 else if (flags & LONGLONG) 706 *va_arg(ap, quad_t *) = res; 707 else if (flags & INTMAXT) 708 *va_arg(ap, intmax_t *) = res; 709 else if (flags & PTRDIFFT) 710 *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res; 711 else if (flags & SIZET) 712 *va_arg(ap, size_t *) = (size_t)res; 713 else 714 *va_arg(ap, int *) = (int)res; 715 nassigned++; 716 } 717 _DIAGASSERT(__type_fit(int, p - buf)); 718 nread += (int)(p - buf); 719 nconversions++; 720 break; 721 722 #ifndef NO_FLOATING_POINT 723 case CT_FLOAT: 724 /* scan a floating point number as if by strtod */ 725 if (width == 0 || width > sizeof(buf) / 726 sizeof(*buf) - 1) 727 width = sizeof(buf) / sizeof(*buf) - 1; 728 if ((width = parsefloat(fp, buf, buf + width, loc)) == 0) 729 goto match_failure; 730 if ((flags & SUPPRESS) == 0) { 731 if (flags & LONGDBL) { 732 long double res = wcstold_l(buf, &p, 733 loc); 734 *va_arg(ap, long double *) = res; 735 } else 736 if (flags & LONG) { 737 double res = wcstod_l(buf, &p, loc); 738 *va_arg(ap, double *) = res; 739 } else { 740 float res = wcstof_l(buf, &p, loc); 741 *va_arg(ap, float *) = res; 742 } 743 #ifdef DEBUG 744 if (p - buf != (ptrdiff_t)width) 745 abort(); 746 #endif 747 nassigned++; 748 } 749 nread += width; 750 nconversions++; 751 break; 752 #endif /* !NO_FLOATING_POINT */ 753 } 754 } 755 input_failure: 756 return nconversions != 0 ? nassigned : EOF; 757 match_failure: 758 return nassigned; 759 } 760 761 #ifndef NO_FLOATING_POINT 762 static int 763 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t loc) 764 { 765 wchar_t *commit, *p; 766 int infnanpos = 0; 767 enum { 768 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX, 769 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS 770 } state = S_START; 771 wchar_t c; 772 wchar_t decpt = (wchar_t)(unsigned char)*localeconv_l(loc)->decimal_point; 773 int gotmantdig = 0, ishex = 0; 774 775 /* 776 * We set commit = p whenever the string we have read so far 777 * constitutes a valid representation of a floating point 778 * number by itself. At some point, the parse will complete 779 * or fail, and we will ungetc() back to the last commit point. 780 * To ensure that the file offset gets updated properly, it is 781 * always necessary to read at least one character that doesn't 782 * match; thus, we can't short-circuit "infinity" or "nan(...)". 783 */ 784 commit = buf - 1; 785 c = WEOF; 786 for (p = buf; p < end; ) { 787 if ((c = __fgetwc_unlock(fp)) == WEOF) 788 break; 789 reswitch: 790 switch (state) { 791 case S_START: 792 state = S_GOTSIGN; 793 if (c == '-' || c == '+') 794 break; 795 else 796 goto reswitch; 797 case S_GOTSIGN: 798 switch (c) { 799 case '0': 800 state = S_MAYBEHEX; 801 commit = p; 802 break; 803 case 'I': 804 case 'i': 805 state = S_INF; 806 break; 807 case 'N': 808 case 'n': 809 state = S_NAN; 810 break; 811 default: 812 state = S_DIGITS; 813 goto reswitch; 814 } 815 break; 816 case S_INF: 817 if (infnanpos > 6 || 818 (c != "nfinity"[infnanpos] && 819 c != "NFINITY"[infnanpos])) 820 goto parsedone; 821 if (infnanpos == 1 || infnanpos == 6) 822 commit = p; /* inf or infinity */ 823 infnanpos++; 824 break; 825 case S_NAN: 826 switch (infnanpos) { 827 case -1: /* XXX kludge to deal with nan(...) */ 828 goto parsedone; 829 case 0: 830 if (c != 'A' && c != 'a') 831 goto parsedone; 832 break; 833 case 1: 834 if (c != 'N' && c != 'n') 835 goto parsedone; 836 else 837 commit = p; 838 break; 839 case 2: 840 if (c != '(') 841 goto parsedone; 842 break; 843 default: 844 if (c == ')') { 845 commit = p; 846 infnanpos = -2; 847 } else if (!iswalnum_l(c, loc) && c != '_') 848 goto parsedone; 849 break; 850 } 851 infnanpos++; 852 break; 853 case S_MAYBEHEX: 854 state = S_DIGITS; 855 if (c == 'X' || c == 'x') { 856 ishex = 1; 857 break; 858 } else { /* we saw a '0', but no 'x' */ 859 gotmantdig = 1; 860 goto reswitch; 861 } 862 case S_DIGITS: 863 if ((ishex && iswxdigit_l(c, loc)) || 864 iswdigit_l(c, loc)) 865 gotmantdig = 1; 866 else { 867 state = S_FRAC; 868 if (c != decpt) 869 goto reswitch; 870 } 871 if (gotmantdig) 872 commit = p; 873 break; 874 case S_FRAC: 875 if (((c == 'E' || c == 'e') && !ishex) || 876 ((c == 'P' || c == 'p') && ishex)) { 877 if (!gotmantdig) 878 goto parsedone; 879 else 880 state = S_EXP; 881 } else if ((ishex && iswxdigit_l(c, loc)) || 882 iswdigit_l(c, loc)) { 883 commit = p; 884 gotmantdig = 1; 885 } else 886 goto parsedone; 887 break; 888 case S_EXP: 889 state = S_EXPDIGITS; 890 if (c == '-' || c == '+') 891 break; 892 else 893 goto reswitch; 894 case S_EXPDIGITS: 895 if (iswdigit_l(c, loc)) 896 commit = p; 897 else 898 goto parsedone; 899 break; 900 default: 901 abort(); 902 } 903 *p++ = c; 904 c = WEOF; 905 } 906 907 parsedone: 908 if (c != WEOF) 909 ungetwc(c, fp); 910 while (commit < --p) 911 ungetwc(*p, fp); 912 *++commit = '\0'; 913 _DIAGASSERT(__type_fit(int, commit - buf)); 914 return (int)(commit - buf); 915 } 916 #endif 917
Indexes created Sat Sep 20 22:09:52 GMT 2025