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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93"; 35 #endif /* LIBC_SCCS and not lint */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "namespace.h" 40 #include <ctype.h> 41 #include <inttypes.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <stddef.h> 45 #include <stdarg.h> 46 #include <string.h> 47 #include <wchar.h> 48 #include <wctype.h> 49 #include "un-namespace.h" 50 51 #include "collate.h" 52 #include "libc_private.h" 53 #include "local.h" 54 55 #ifndef NO_FLOATING_POINT 56 #include <locale.h> 57 #endif 58 59 #define BUF 513 /* Maximum length of numeric string. */ 60 61 /* 62 * Flags used during conversion. 63 */ 64 #define LONG 0x01 /* l: long or double */ 65 #define LONGDBL 0x02 /* L: long double */ 66 #define SHORT 0x04 /* h: short */ 67 #define SUPPRESS 0x08 /* *: suppress assignment */ 68 #define POINTER 0x10 /* p: void * (as hex) */ 69 #define NOSKIP 0x20 /* [ or c: do not skip blanks */ 70 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 71 #define INTMAXT 0x800 /* j: intmax_t */ 72 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 73 #define SIZET 0x2000 /* z: size_t */ 74 #define SHORTSHORT 0x4000 /* hh: char */ 75 #define UNSIGNED 0x8000 /* %[oupxX] conversions */ 76 77 /* 78 * The following are used in integral conversions only: 79 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS 80 */ 81 #define SIGNOK 0x40 /* +/- is (still) legal */ 82 #define NDIGITS 0x80 /* no digits detected */ 83 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 84 #define NZDIGITS 0x200 /* no zero digits detected */ 85 #define HAVESIGN 0x10000 /* sign detected */ 86 87 /* 88 * Conversion types. 89 */ 90 #define CT_CHAR 0 /* %c conversion */ 91 #define CT_CCL 1 /* %[...] conversion */ 92 #define CT_STRING 2 /* %s conversion */ 93 #define CT_INT 3 /* %[dioupxX] conversion */ 94 #define CT_FLOAT 4 /* %[efgEFG] conversion */ 95 96 static const u_char *__sccl(char *, const u_char *); 97 #ifndef NO_FLOATING_POINT 98 static int parsefloat(FILE *, char *, char *); 99 #endif 100 101 __weak_reference(__vfscanf, vfscanf); 102 103 /* 104 * __vfscanf - MT-safe version 105 */ 106 int 107 __vfscanf(FILE *fp, char const *fmt0, va_list ap) 108 { 109 int ret; 110 111 FLOCKFILE(fp); 112 ret = __svfscanf(fp, fmt0, ap); 113 FUNLOCKFILE(fp); 114 return (ret); 115 } 116 117 /* 118 * __svfscanf - non-MT-safe version of __vfscanf 119 */ 120 int 121 __svfscanf(FILE *fp, const char *fmt0, va_list ap) 122 { 123 const u_char *fmt = (const u_char *)fmt0; 124 int c; /* character from format, or conversion */ 125 size_t width; /* field width, or 0 */ 126 char *p; /* points into all kinds of strings */ 127 int n; /* handy integer */ 128 int flags; /* flags as defined above */ 129 char *p0; /* saves original value of p when necessary */ 130 int nassigned; /* number of fields assigned */ 131 int nconversions; /* number of conversions */ 132 int nread; /* number of characters consumed from fp */ 133 int base; /* base argument to conversion function */ 134 char ccltab[256]; /* character class table for %[...] */ 135 char buf[BUF]; /* buffer for numeric and mb conversions */ 136 wchar_t *wcp; /* handy wide character pointer */ 137 size_t nconv; /* length of multibyte sequence converted */ 138 static const mbstate_t initial; 139 mbstate_t mbs; 140 141 /* `basefix' is used to avoid `if' tests in the integer scanner */ 142 static short basefix[17] = 143 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 144 145 ORIENT(fp, -1); 146 147 nassigned = 0; 148 nconversions = 0; 149 nread = 0; 150 for (;;) { 151 c = *fmt++; 152 if (c == 0) 153 return (nassigned); 154 if (isspace(c)) { 155 while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p)) 156 nread++, fp->_r--, fp->_p++; 157 continue; 158 } 159 if (c != '%') 160 goto literal; 161 width = 0; 162 flags = 0; 163 /* 164 * switch on the format. continue if done; 165 * break once format type is derived. 166 */ 167 again: c = *fmt++; 168 switch (c) { 169 case '%': 170 literal: 171 if (fp->_r <= 0 && __srefill(fp)) 172 goto input_failure; 173 if (*fp->_p != c) 174 goto match_failure; 175 fp->_r--, fp->_p++; 176 nread++; 177 continue; 178 179 case '*': 180 flags |= SUPPRESS; 181 goto again; 182 case 'j': 183 flags |= INTMAXT; 184 goto again; 185 case 'l': 186 if (flags & LONG) { 187 flags &= ~LONG; 188 flags |= LONGLONG; 189 } else 190 flags |= LONG; 191 goto again; 192 case 'q': 193 flags |= LONGLONG; /* not quite */ 194 goto again; 195 case 't': 196 flags |= PTRDIFFT; 197 goto again; 198 case 'z': 199 flags |= SIZET; 200 goto again; 201 case 'L': 202 flags |= LONGDBL; 203 goto again; 204 case 'h': 205 if (flags & SHORT) { 206 flags &= ~SHORT; 207 flags |= SHORTSHORT; 208 } else 209 flags |= SHORT; 210 goto again; 211 212 case '0': case '1': case '2': case '3': case '4': 213 case '5': case '6': case '7': case '8': case '9': 214 width = width * 10 + c - '0'; 215 goto again; 216 217 /* 218 * Conversions. 219 */ 220 case 'd': 221 c = CT_INT; 222 base = 10; 223 break; 224 225 case 'i': 226 c = CT_INT; 227 base = 0; 228 break; 229 230 case 'o': 231 c = CT_INT; 232 flags |= UNSIGNED; 233 base = 8; 234 break; 235 236 case 'u': 237 c = CT_INT; 238 flags |= UNSIGNED; 239 base = 10; 240 break; 241 242 case 'X': 243 case 'x': 244 flags |= PFXOK; /* enable 0x prefixing */ 245 c = CT_INT; 246 flags |= UNSIGNED; 247 base = 16; 248 break; 249 250 #ifndef NO_FLOATING_POINT 251 case 'A': case 'E': case 'F': case 'G': 252 case 'a': case 'e': case 'f': case 'g': 253 c = CT_FLOAT; 254 break; 255 #endif 256 257 case 'S': 258 flags |= LONG; 259 /* FALLTHROUGH */ 260 case 's': 261 c = CT_STRING; 262 break; 263 264 case '[': 265 fmt = __sccl(ccltab, fmt); 266 flags |= NOSKIP; 267 c = CT_CCL; 268 break; 269 270 case 'C': 271 flags |= LONG; 272 /* FALLTHROUGH */ 273 case 'c': 274 flags |= NOSKIP; 275 c = CT_CHAR; 276 break; 277 278 case 'p': /* pointer format is like hex */ 279 flags |= POINTER | PFXOK; 280 c = CT_INT; /* assumes sizeof(uintmax_t) */ 281 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 282 base = 16; 283 break; 284 285 case 'n': 286 nconversions++; 287 if (flags & SUPPRESS) /* ??? */ 288 continue; 289 if (flags & SHORTSHORT) 290 *va_arg(ap, char *) = nread; 291 else if (flags & SHORT) 292 *va_arg(ap, short *) = nread; 293 else if (flags & LONG) 294 *va_arg(ap, long *) = nread; 295 else if (flags & LONGLONG) 296 *va_arg(ap, long long *) = nread; 297 else if (flags & INTMAXT) 298 *va_arg(ap, intmax_t *) = nread; 299 else if (flags & SIZET) 300 *va_arg(ap, size_t *) = nread; 301 else if (flags & PTRDIFFT) 302 *va_arg(ap, ptrdiff_t *) = nread; 303 else 304 *va_arg(ap, int *) = nread; 305 continue; 306 307 default: 308 goto match_failure; 309 310 /* 311 * Disgusting backwards compatibility hack. XXX 312 */ 313 case '\0': /* compat */ 314 return (EOF); 315 } 316 317 /* 318 * We have a conversion that requires input. 319 */ 320 if (fp->_r <= 0 && __srefill(fp)) 321 goto input_failure; 322 323 /* 324 * Consume leading white space, except for formats 325 * that suppress this. 326 */ 327 if ((flags & NOSKIP) == 0) { 328 while (isspace(*fp->_p)) { 329 nread++; 330 if (--fp->_r > 0) 331 fp->_p++; 332 else if (__srefill(fp)) 333 goto input_failure; 334 } 335 /* 336 * Note that there is at least one character in 337 * the buffer, so conversions that do not set NOSKIP 338 * ca no longer result in an input failure. 339 */ 340 } 341 342 /* 343 * Do the conversion. 344 */ 345 switch (c) { 346 347 case CT_CHAR: 348 /* scan arbitrary characters (sets NOSKIP) */ 349 if (width == 0) 350 width = 1; 351 if (flags & LONG) { 352 if ((flags & SUPPRESS) == 0) 353 wcp = va_arg(ap, wchar_t *); 354 else 355 wcp = NULL; 356 n = 0; 357 while (width != 0) { 358 if (n == MB_CUR_MAX) { 359 fp->_flags |= __SERR; 360 goto input_failure; 361 } 362 buf[n++] = *fp->_p; 363 fp->_p++; 364 fp->_r--; 365 mbs = initial; 366 nconv = mbrtowc(wcp, buf, n, &mbs); 367 if (nconv == (size_t)-1) { 368 fp->_flags |= __SERR; 369 goto input_failure; 370 } 371 if (nconv == 0 && !(flags & SUPPRESS)) 372 *wcp = L'\0'; 373 if (nconv != (size_t)-2) { 374 nread += n; 375 width--; 376 if (!(flags & SUPPRESS)) 377 wcp++; 378 n = 0; 379 } 380 if (fp->_r <= 0 && __srefill(fp)) { 381 if (n != 0) { 382 fp->_flags |= __SERR; 383 goto input_failure; 384 } 385 break; 386 } 387 } 388 if (!(flags & SUPPRESS)) 389 nassigned++; 390 } else if (flags & SUPPRESS) { 391 size_t sum = 0; 392 for (;;) { 393 if ((n = fp->_r) < width) { 394 sum += n; 395 width -= n; 396 fp->_p += n; 397 if (__srefill(fp)) { 398 if (sum == 0) 399 goto input_failure; 400 break; 401 } 402 } else { 403 sum += width; 404 fp->_r -= width; 405 fp->_p += width; 406 break; 407 } 408 } 409 nread += sum; 410 } else { 411 size_t r = __fread((void *)va_arg(ap, char *), 1, 412 width, fp); 413 414 if (r == 0) 415 goto input_failure; 416 nread += r; 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 & LONG) { 428 wchar_t twc; 429 int nchars; 430 431 if ((flags & SUPPRESS) == 0) 432 wcp = va_arg(ap, wchar_t *); 433 else 434 wcp = &twc; 435 n = 0; 436 nchars = 0; 437 while (width != 0) { 438 if (n == MB_CUR_MAX) { 439 fp->_flags |= __SERR; 440 goto input_failure; 441 } 442 buf[n++] = *fp->_p; 443 fp->_p++; 444 fp->_r--; 445 mbs = initial; 446 nconv = mbrtowc(wcp, buf, n, &mbs); 447 if (nconv == (size_t)-1) { 448 fp->_flags |= __SERR; 449 goto input_failure; 450 } 451 if (nconv == 0) 452 *wcp = L'\0'; 453 if (nconv != (size_t)-2) { 454 if (wctob(*wcp) != EOF && 455 !ccltab[wctob(*wcp)]) { 456 while (n != 0) { 457 n--; 458 __ungetc(buf[n], 459 fp); 460 } 461 break; 462 } 463 nread += n; 464 width--; 465 if (!(flags & SUPPRESS)) 466 wcp++; 467 nchars++; 468 n = 0; 469 } 470 if (fp->_r <= 0 && __srefill(fp)) { 471 if (n != 0) { 472 fp->_flags |= __SERR; 473 goto input_failure; 474 } 475 break; 476 } 477 } 478 if (n != 0) { 479 fp->_flags |= __SERR; 480 goto input_failure; 481 } 482 n = nchars; 483 if (n == 0) 484 goto match_failure; 485 if (!(flags & SUPPRESS)) { 486 *wcp = L'\0'; 487 nassigned++; 488 } 489 } else if (flags & SUPPRESS) { 490 n = 0; 491 while (ccltab[*fp->_p]) { 492 n++, fp->_r--, fp->_p++; 493 if (--width == 0) 494 break; 495 if (fp->_r <= 0 && __srefill(fp)) { 496 if (n == 0) 497 goto input_failure; 498 break; 499 } 500 } 501 if (n == 0) 502 goto match_failure; 503 } else { 504 p0 = p = va_arg(ap, char *); 505 while (ccltab[*fp->_p]) { 506 fp->_r--; 507 *p++ = *fp->_p++; 508 if (--width == 0) 509 break; 510 if (fp->_r <= 0 && __srefill(fp)) { 511 if (p == p0) 512 goto input_failure; 513 break; 514 } 515 } 516 n = p - p0; 517 if (n == 0) 518 goto match_failure; 519 *p = 0; 520 nassigned++; 521 } 522 nread += n; 523 nconversions++; 524 break; 525 526 case CT_STRING: 527 /* like CCL, but zero-length string OK, & no NOSKIP */ 528 if (width == 0) 529 width = (size_t)~0; 530 if (flags & LONG) { 531 wchar_t twc; 532 533 if ((flags & SUPPRESS) == 0) 534 wcp = va_arg(ap, wchar_t *); 535 else 536 wcp = &twc; 537 n = 0; 538 while (!isspace(*fp->_p) && width != 0) { 539 if (n == MB_CUR_MAX) { 540 fp->_flags |= __SERR; 541 goto input_failure; 542 } 543 buf[n++] = *fp->_p; 544 fp->_p++; 545 fp->_r--; 546 mbs = initial; 547 nconv = mbrtowc(wcp, buf, n, &mbs); 548 if (nconv == (size_t)-1) { 549 fp->_flags |= __SERR; 550 goto input_failure; 551 } 552 if (nconv == 0) 553 *wcp = L'\0'; 554 if (nconv != (size_t)-2) { 555 if (iswspace(*wcp)) { 556 while (n != 0) { 557 n--; 558 __ungetc(buf[n], 559 fp); 560 } 561 break; 562 } 563 nread += n; 564 width--; 565 if (!(flags & SUPPRESS)) 566 wcp++; 567 n = 0; 568 } 569 if (fp->_r <= 0 && __srefill(fp)) { 570 if (n != 0) { 571 fp->_flags |= __SERR; 572 goto input_failure; 573 } 574 break; 575 } 576 } 577 if (!(flags & SUPPRESS)) { 578 *wcp = L'\0'; 579 nassigned++; 580 } 581 } else if (flags & SUPPRESS) { 582 n = 0; 583 while (!isspace(*fp->_p)) { 584 n++, fp->_r--, fp->_p++; 585 if (--width == 0) 586 break; 587 if (fp->_r <= 0 && __srefill(fp)) 588 break; 589 } 590 nread += n; 591 } else { 592 p0 = p = va_arg(ap, char *); 593 while (!isspace(*fp->_p)) { 594 fp->_r--; 595 *p++ = *fp->_p++; 596 if (--width == 0) 597 break; 598 if (fp->_r <= 0 && __srefill(fp)) 599 break; 600 } 601 *p = 0; 602 nread += p - p0; 603 nassigned++; 604 } 605 nconversions++; 606 continue; 607 608 case CT_INT: 609 /* scan an integer as if by the conversion function */ 610 #ifdef hardway 611 if (width == 0 || width > sizeof(buf) - 1) 612 width = sizeof(buf) - 1; 613 #else 614 /* size_t is unsigned, hence this optimisation */ 615 if (--width > sizeof(buf) - 2) 616 width = sizeof(buf) - 2; 617 width++; 618 #endif 619 flags |= SIGNOK | NDIGITS | NZDIGITS; 620 for (p = buf; width; width--) { 621 c = *fp->_p; 622 /* 623 * Switch on the character; `goto ok' 624 * if we accept it as a part of number. 625 */ 626 switch (c) { 627 628 /* 629 * The digit 0 is always legal, but is 630 * special. For %i conversions, if no 631 * digits (zero or nonzero) have been 632 * scanned (only signs), we will have 633 * base==0. In that case, we should set 634 * it to 8 and enable 0x prefixing. 635 * Also, if we have not scanned zero digits 636 * before this, do not turn off prefixing 637 * (someone else will turn it off if we 638 * have scanned any nonzero digits). 639 */ 640 case '0': 641 if (base == 0) { 642 base = 8; 643 flags |= PFXOK; 644 } 645 if (flags & NZDIGITS) 646 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 647 else 648 flags &= ~(SIGNOK|PFXOK|NDIGITS); 649 goto ok; 650 651 /* 1 through 7 always legal */ 652 case '1': case '2': case '3': 653 case '4': case '5': case '6': case '7': 654 base = basefix[base]; 655 flags &= ~(SIGNOK | PFXOK | NDIGITS); 656 goto ok; 657 658 /* digits 8 and 9 ok iff decimal or hex */ 659 case '8': case '9': 660 base = basefix[base]; 661 if (base <= 8) 662 break; /* not legal here */ 663 flags &= ~(SIGNOK | PFXOK | NDIGITS); 664 goto ok; 665 666 /* letters ok iff hex */ 667 case 'A': case 'B': case 'C': 668 case 'D': case 'E': case 'F': 669 case 'a': case 'b': case 'c': 670 case 'd': case 'e': case 'f': 671 /* no need to fix base here */ 672 if (base <= 10) 673 break; /* not legal here */ 674 flags &= ~(SIGNOK | PFXOK | NDIGITS); 675 goto ok; 676 677 /* sign ok only as first character */ 678 case '+': case '-': 679 if (flags & SIGNOK) { 680 flags &= ~SIGNOK; 681 flags |= HAVESIGN; 682 goto ok; 683 } 684 break; 685 686 /* 687 * x ok iff flag still set & 2nd char (or 688 * 3rd char if we have a sign). 689 */ 690 case 'x': case 'X': 691 if (flags & PFXOK && p == 692 buf + 1 + !!(flags & HAVESIGN)) { 693 base = 16; /* if %i */ 694 flags &= ~PFXOK; 695 goto ok; 696 } 697 break; 698 } 699 700 /* 701 * If we got here, c is not a legal character 702 * for a number. Stop accumulating digits. 703 */ 704 break; 705 ok: 706 /* 707 * c is legal: store it and look at the next. 708 */ 709 *p++ = c; 710 if (--fp->_r > 0) 711 fp->_p++; 712 else if (__srefill(fp)) 713 break; /* EOF */ 714 } 715 /* 716 * If we had only a sign, it is no good; push 717 * back the sign. If the number ends in `x', 718 * it was [sign] '0' 'x', so push back the x 719 * and treat it as [sign] '0'. 720 */ 721 if (flags & NDIGITS) { 722 if (p > buf) 723 (void) __ungetc(*(u_char *)--p, fp); 724 goto match_failure; 725 } 726 c = ((u_char *)p)[-1]; 727 if (c == 'x' || c == 'X') { 728 --p; 729 (void) __ungetc(c, fp); 730 } 731 if ((flags & SUPPRESS) == 0) { 732 uintmax_t res; 733 734 *p = 0; 735 if ((flags & UNSIGNED) == 0) 736 res = strtoimax(buf, (char **)NULL, base); 737 else 738 res = strtoumax(buf, (char **)NULL, base); 739 if (flags & POINTER) 740 *va_arg(ap, void **) = 741 (void *)(uintptr_t)res; 742 else if (flags & SHORTSHORT) 743 *va_arg(ap, char *) = res; 744 else if (flags & SHORT) 745 *va_arg(ap, short *) = res; 746 else if (flags & LONG) 747 *va_arg(ap, long *) = res; 748 else if (flags & LONGLONG) 749 *va_arg(ap, long long *) = res; 750 else if (flags & INTMAXT) 751 *va_arg(ap, intmax_t *) = res; 752 else if (flags & PTRDIFFT) 753 *va_arg(ap, ptrdiff_t *) = res; 754 else if (flags & SIZET) 755 *va_arg(ap, size_t *) = res; 756 else 757 *va_arg(ap, int *) = res; 758 nassigned++; 759 } 760 nread += p - buf; 761 nconversions++; 762 break; 763 764 #ifndef NO_FLOATING_POINT 765 case CT_FLOAT: 766 /* scan a floating point number as if by strtod */ 767 if (width == 0 || width > sizeof(buf) - 1) 768 width = sizeof(buf) - 1; 769 if ((width = parsefloat(fp, buf, buf + width)) == 0) 770 goto match_failure; 771 if ((flags & SUPPRESS) == 0) { 772 if (flags & LONGDBL) { 773 long double res = strtold(buf, &p); 774 *va_arg(ap, long double *) = res; 775 } else if (flags & LONG) { 776 double res = strtod(buf, &p); 777 *va_arg(ap, double *) = res; 778 } else { 779 float res = strtof(buf, &p); 780 *va_arg(ap, float *) = res; 781 } 782 nassigned++; 783 } 784 nread += width; 785 nconversions++; 786 break; 787 #endif /* !NO_FLOATING_POINT */ 788 } 789 } 790 input_failure: 791 return (nconversions != 0 ? nassigned : EOF); 792 match_failure: 793 return (nassigned); 794 } 795 796 /* 797 * Fill in the given table from the scanset at the given format 798 * (just after `['). Return a pointer to the character past the 799 * closing `]'. The table has a 1 wherever characters should be 800 * considered part of the scanset. 801 */ 802 static const u_char * 803 __sccl(tab, fmt) 804 char *tab; 805 const u_char *fmt; 806 { 807 int c, n, v, i; 808 809 /* first `clear' the whole table */ 810 c = *fmt++; /* first char hat => negated scanset */ 811 if (c == '^') { 812 v = 1; /* default => accept */ 813 c = *fmt++; /* get new first char */ 814 } else 815 v = 0; /* default => reject */ 816 817 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ 818 (void) memset(tab, v, 256); 819 820 if (c == 0) 821 return (fmt - 1);/* format ended before closing ] */ 822 823 /* 824 * Now set the entries corresponding to the actual scanset 825 * to the opposite of the above. 826 * 827 * The first character may be ']' (or '-') without being special; 828 * the last character may be '-'. 829 */ 830 v = 1 - v; 831 for (;;) { 832 tab[c] = v; /* take character c */ 833 doswitch: 834 n = *fmt++; /* and examine the next */ 835 switch (n) { 836 837 case 0: /* format ended too soon */ 838 return (fmt - 1); 839 840 case '-': 841 /* 842 * A scanset of the form 843 * [01+-] 844 * is defined as `the digit 0, the digit 1, 845 * the character +, the character -', but 846 * the effect of a scanset such as 847 * [a-zA-Z0-9] 848 * is implementation defined. The V7 Unix 849 * scanf treats `a-z' as `the letters a through 850 * z', but treats `a-a' as `the letter a, the 851 * character -, and the letter a'. 852 * 853 * For compatibility, the `-' is not considerd 854 * to define a range if the character following 855 * it is either a close bracket (required by ANSI) 856 * or is not numerically greater than the character 857 * we just stored in the table (c). 858 */ 859 n = *fmt; 860 if (n == ']' 861 || (__collate_load_error ? n < c : 862 __collate_range_cmp (n, c) < 0 863 ) 864 ) { 865 c = '-'; 866 break; /* resume the for(;;) */ 867 } 868 fmt++; 869 /* fill in the range */ 870 if (__collate_load_error) { 871 do { 872 tab[++c] = v; 873 } while (c < n); 874 } else { 875 for (i = 0; i < 256; i ++) 876 if ( __collate_range_cmp (c, i) < 0 877 && __collate_range_cmp (i, n) <= 0 878 ) 879 tab[i] = v; 880 } 881 #if 1 /* XXX another disgusting compatibility hack */ 882 c = n; 883 /* 884 * Alas, the V7 Unix scanf also treats formats 885 * such as [a-c-e] as `the letters a through e'. 886 * This too is permitted by the standard.... 887 */ 888 goto doswitch; 889 #else 890 c = *fmt++; 891 if (c == 0) 892 return (fmt - 1); 893 if (c == ']') 894 return (fmt); 895 #endif 896 break; 897 898 case ']': /* end of scanset */ 899 return (fmt); 900 901 default: /* just another character */ 902 c = n; 903 break; 904 } 905 } 906 /* NOTREACHED */ 907 } 908 909 #ifndef NO_FLOATING_POINT 910 static int 911 parsefloat(FILE *fp, char *buf, char *end) 912 { 913 char *commit, *p; 914 int infnanpos = 0, decptpos = 0; 915 enum { 916 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX, 917 S_DIGITS, S_DECPT, S_FRAC, S_EXP, S_EXPDIGITS 918 } state = S_START; 919 unsigned char c; 920 const char *decpt = localeconv()->decimal_point; 921 _Bool gotmantdig = 0, ishex = 0; 922 923 /* 924 * We set commit = p whenever the string we have read so far 925 * constitutes a valid representation of a floating point 926 * number by itself. At some point, the parse will complete 927 * or fail, and we will ungetc() back to the last commit point. 928 * To ensure that the file offset gets updated properly, it is 929 * always necessary to read at least one character that doesn't 930 * match; thus, we can't short-circuit "infinity" or "nan(...)". 931 */ 932 commit = buf - 1; 933 for (p = buf; p < end; ) { 934 c = *fp->_p; 935 reswitch: 936 switch (state) { 937 case S_START: 938 state = S_GOTSIGN; 939 if (c == '-' || c == '+') 940 break; 941 else 942 goto reswitch; 943 case S_GOTSIGN: 944 switch (c) { 945 case '0': 946 state = S_MAYBEHEX; 947 commit = p; 948 break; 949 case 'I': 950 case 'i': 951 state = S_INF; 952 break; 953 case 'N': 954 case 'n': 955 state = S_NAN; 956 break; 957 default: 958 state = S_DIGITS; 959 goto reswitch; 960 } 961 break; 962 case S_INF: 963 if (infnanpos > 6 || 964 (c != "nfinity"[infnanpos] && 965 c != "NFINITY"[infnanpos])) 966 goto parsedone; 967 if (infnanpos == 1 || infnanpos == 6) 968 commit = p; /* inf or infinity */ 969 infnanpos++; 970 break; 971 case S_NAN: 972 switch (infnanpos) { 973 case 0: 974 if (c != 'A' && c != 'a') 975 goto parsedone; 976 break; 977 case 1: 978 if (c != 'N' && c != 'n') 979 goto parsedone; 980 else 981 commit = p; 982 break; 983 case 2: 984 if (c != '(') 985 goto parsedone; 986 break; 987 default: 988 if (c == ')') { 989 commit = p; 990 state = S_DONE; 991 } else if (!isalnum(c) && c != '_') 992 goto parsedone; 993 break; 994 } 995 infnanpos++; 996 break; 997 case S_DONE: 998 goto parsedone; 999 case S_MAYBEHEX: 1000 state = S_DIGITS; 1001 if (c == 'X' || c == 'x') { 1002 ishex = 1; 1003 break; 1004 } else { /* we saw a '0', but no 'x' */ 1005 gotmantdig = 1; 1006 goto reswitch; 1007 } 1008 case S_DIGITS: 1009 if ((ishex && isxdigit(c)) || isdigit(c)) { 1010 gotmantdig = 1; 1011 commit = p; 1012 break; 1013 } else { 1014 state = S_DECPT; 1015 goto reswitch; 1016 } 1017 case S_DECPT: 1018 if (c == decpt[decptpos]) { 1019 if (decpt[++decptpos] == '\0') { 1020 /* We read the complete decpt seq. */ 1021 state = S_FRAC; 1022 if (gotmantdig) 1023 commit = p; 1024 } 1025 break; 1026 } else if (!decptpos) { 1027 /* We didn't read any decpt characters. */ 1028 state = S_FRAC; 1029 goto reswitch; 1030 } else { 1031 /* 1032 * We read part of a multibyte decimal point, 1033 * but the rest is invalid, so bail. 1034 */ 1035 goto parsedone; 1036 } 1037 case S_FRAC: 1038 if (((c == 'E' || c == 'e') && !ishex) || 1039 ((c == 'P' || c == 'p') && ishex)) { 1040 if (!gotmantdig) 1041 goto parsedone; 1042 else 1043 state = S_EXP; 1044 } else if ((ishex && isxdigit(c)) || isdigit(c)) { 1045 commit = p; 1046 gotmantdig = 1; 1047 } else 1048 goto parsedone; 1049 break; 1050 case S_EXP: 1051 state = S_EXPDIGITS; 1052 if (c == '-' || c == '+') 1053 break; 1054 else 1055 goto reswitch; 1056 case S_EXPDIGITS: 1057 if (isdigit(c)) 1058 commit = p; 1059 else 1060 goto parsedone; 1061 break; 1062 default: 1063 abort(); 1064 } 1065 *p++ = c; 1066 if (--fp->_r > 0) 1067 fp->_p++; 1068 else if (__srefill(fp)) 1069 break; /* EOF */ 1070 } 1071 1072 parsedone: 1073 while (commit < --p) 1074 __ungetc(*(u_char *)p, fp); 1075 *++commit = '\0'; 1076 return (commit - buf); 1077 } 1078 #endif 1079