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 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "namespace.h" 44 #include <ctype.h> 45 #include <inttypes.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <stddef.h> 49 #include <stdarg.h> 50 #include <string.h> 51 #include <wchar.h> 52 #include <wctype.h> 53 #include "un-namespace.h" 54 55 #include "collate.h" 56 #include "libc_private.h" 57 #include "local.h" 58 59 #define FLOATING_POINT 60 61 #ifdef FLOATING_POINT 62 #include <locale.h> 63 #endif 64 65 #define BUF 513 /* Maximum length of numeric string. */ 66 67 /* 68 * Flags used during conversion. 69 */ 70 #define LONG 0x01 /* l: long or double */ 71 #define LONGDBL 0x02 /* L: long double */ 72 #define SHORT 0x04 /* h: short */ 73 #define SUPPRESS 0x08 /* *: suppress assignment */ 74 #define POINTER 0x10 /* p: void * (as hex) */ 75 #define NOSKIP 0x20 /* [ or c: do not skip blanks */ 76 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 77 #define INTMAXT 0x800 /* j: intmax_t */ 78 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 79 #define SIZET 0x2000 /* z: size_t */ 80 #define SHORTSHORT 0x4000 /* hh: char */ 81 #define UNSIGNED 0x8000 /* %[oupxX] conversions */ 82 83 /* 84 * The following are used in integral conversions only: 85 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS 86 */ 87 #define SIGNOK 0x40 /* +/- is (still) legal */ 88 #define NDIGITS 0x80 /* no digits detected */ 89 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 90 #define NZDIGITS 0x200 /* no zero digits detected */ 91 92 /* 93 * Conversion types. 94 */ 95 #define CT_CHAR 0 /* %c conversion */ 96 #define CT_CCL 1 /* %[...] conversion */ 97 #define CT_STRING 2 /* %s conversion */ 98 #define CT_INT 3 /* %[dioupxX] conversion */ 99 #define CT_FLOAT 4 /* %[efgEFG] conversion */ 100 101 static const u_char *__sccl(char *, const u_char *); 102 static int parsefloat(FILE *, char *, char *); 103 104 int __scanfdebug = 0; 105 106 __weak_reference(__vfscanf, vfscanf); 107 108 /* 109 * __vfscanf - MT-safe version 110 */ 111 int 112 __vfscanf(FILE *fp, char const *fmt0, va_list ap) 113 { 114 int ret; 115 116 FLOCKFILE(fp); 117 ret = __svfscanf(fp, fmt0, ap); 118 FUNLOCKFILE(fp); 119 return (ret); 120 } 121 122 /* 123 * __svfscanf - non-MT-safe version of __vfscanf 124 */ 125 int 126 __svfscanf(FILE *fp, const char *fmt0, va_list ap) 127 { 128 const u_char *fmt = (const u_char *)fmt0; 129 int c; /* character from format, or conversion */ 130 size_t width; /* field width, or 0 */ 131 char *p; /* points into all kinds of strings */ 132 int n; /* handy integer */ 133 int flags; /* flags as defined above */ 134 char *p0; /* saves original value of p when necessary */ 135 int nassigned; /* number of fields assigned */ 136 int nconversions; /* number of conversions */ 137 int nread; /* number of characters consumed from fp */ 138 int base; /* base argument to conversion function */ 139 char ccltab[256]; /* character class table for %[...] */ 140 char buf[BUF]; /* buffer for numeric and mb conversions */ 141 wchar_t *wcp; /* handy wide character pointer */ 142 wchar_t *wcp0; /* saves original value of wcp */ 143 mbstate_t mbs; /* multibyte conversion state */ 144 size_t nconv; /* length of multibyte sequence converted */ 145 146 /* `basefix' is used to avoid `if' tests in the integer scanner */ 147 static short basefix[17] = 148 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 149 150 ORIENT(fp, -1); 151 152 nassigned = 0; 153 nconversions = 0; 154 nread = 0; 155 for (;;) { 156 c = *fmt++; 157 if (c == 0) 158 return (nassigned); 159 if (isspace(c)) { 160 while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p)) 161 nread++, fp->_r--, fp->_p++; 162 continue; 163 } 164 if (c != '%') 165 goto literal; 166 width = 0; 167 flags = 0; 168 /* 169 * switch on the format. continue if done; 170 * break once format type is derived. 171 */ 172 again: c = *fmt++; 173 switch (c) { 174 case '%': 175 literal: 176 if (fp->_r <= 0 && __srefill(fp)) 177 goto input_failure; 178 if (*fp->_p != c) 179 goto match_failure; 180 fp->_r--, fp->_p++; 181 nread++; 182 continue; 183 184 case '*': 185 flags |= SUPPRESS; 186 goto again; 187 case 'j': 188 flags |= INTMAXT; 189 goto again; 190 case 'l': 191 if (flags & LONG) { 192 flags &= ~LONG; 193 flags |= LONGLONG; 194 } else 195 flags |= LONG; 196 goto again; 197 case 'q': 198 flags |= LONGLONG; /* not quite */ 199 goto again; 200 case 't': 201 flags |= PTRDIFFT; 202 goto again; 203 case 'z': 204 flags |= SIZET; 205 goto again; 206 case 'L': 207 flags |= LONGDBL; 208 goto again; 209 case 'h': 210 if (flags & SHORT) { 211 flags &= ~SHORT; 212 flags |= SHORTSHORT; 213 } else 214 flags |= SHORT; 215 goto again; 216 217 case '0': case '1': case '2': case '3': case '4': 218 case '5': case '6': case '7': case '8': case '9': 219 width = width * 10 + c - '0'; 220 goto again; 221 222 /* 223 * Conversions. 224 */ 225 case 'd': 226 c = CT_INT; 227 base = 10; 228 break; 229 230 case 'i': 231 c = CT_INT; 232 base = 0; 233 break; 234 235 case 'o': 236 c = CT_INT; 237 flags |= UNSIGNED; 238 base = 8; 239 break; 240 241 case 'u': 242 c = CT_INT; 243 flags |= UNSIGNED; 244 base = 10; 245 break; 246 247 case 'X': 248 case 'x': 249 flags |= PFXOK; /* enable 0x prefixing */ 250 c = CT_INT; 251 flags |= UNSIGNED; 252 base = 16; 253 break; 254 255 #ifdef FLOATING_POINT 256 case 'A': case 'E': case 'F': case 'G': 257 case 'a': case 'e': case 'f': case 'g': 258 c = CT_FLOAT; 259 break; 260 #endif 261 262 case 'S': 263 flags |= LONG; 264 /* FALLTHROUGH */ 265 case 's': 266 c = CT_STRING; 267 break; 268 269 case '[': 270 fmt = __sccl(ccltab, fmt); 271 flags |= NOSKIP; 272 c = CT_CCL; 273 break; 274 275 case 'C': 276 flags |= LONG; 277 /* FALLTHROUGH */ 278 case 'c': 279 flags |= NOSKIP; 280 c = CT_CHAR; 281 break; 282 283 case 'p': /* pointer format is like hex */ 284 flags |= POINTER | PFXOK; 285 c = CT_INT; /* assumes sizeof(uintmax_t) */ 286 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 287 base = 16; 288 break; 289 290 case 'n': 291 nconversions++; 292 if (flags & SUPPRESS) /* ??? */ 293 continue; 294 if (flags & SHORTSHORT) 295 *va_arg(ap, char *) = nread; 296 else if (flags & SHORT) 297 *va_arg(ap, short *) = nread; 298 else if (flags & LONG) 299 *va_arg(ap, long *) = nread; 300 else if (flags & LONGLONG) 301 *va_arg(ap, long long *) = nread; 302 else if (flags & INTMAXT) 303 *va_arg(ap, intmax_t *) = nread; 304 else if (flags & SIZET) 305 *va_arg(ap, size_t *) = nread; 306 else if (flags & PTRDIFFT) 307 *va_arg(ap, ptrdiff_t *) = nread; 308 else 309 *va_arg(ap, int *) = nread; 310 continue; 311 312 default: 313 goto match_failure; 314 315 /* 316 * Disgusting backwards compatibility hack. XXX 317 */ 318 case '\0': /* compat */ 319 return (EOF); 320 } 321 322 /* 323 * We have a conversion that requires input. 324 */ 325 if (fp->_r <= 0 && __srefill(fp)) 326 goto input_failure; 327 328 /* 329 * Consume leading white space, except for formats 330 * that suppress this. 331 */ 332 if ((flags & NOSKIP) == 0) { 333 while (isspace(*fp->_p)) { 334 nread++; 335 if (--fp->_r > 0) 336 fp->_p++; 337 else if (__srefill(fp)) 338 goto input_failure; 339 } 340 /* 341 * Note that there is at least one character in 342 * the buffer, so conversions that do not set NOSKIP 343 * ca no longer result in an input failure. 344 */ 345 } 346 347 /* 348 * Do the conversion. 349 */ 350 switch (c) { 351 352 case CT_CHAR: 353 /* scan arbitrary characters (sets NOSKIP) */ 354 if (width == 0) 355 width = 1; 356 if (flags & LONG) { 357 if ((flags & SUPPRESS) == 0) 358 wcp = va_arg(ap, wchar_t *); 359 else 360 wcp = NULL; 361 n = 0; 362 while (width != 0) { 363 if (n == MB_CUR_MAX) { 364 fp->_flags |= __SERR; 365 goto input_failure; 366 } 367 buf[n++] = *fp->_p; 368 fp->_p++; 369 fp->_r--; 370 memset(&mbs, 0, sizeof(mbs)); 371 nconv = mbrtowc(wcp, buf, n, &mbs); 372 if (nconv == (size_t)-1) { 373 fp->_flags |= __SERR; 374 goto input_failure; 375 } 376 if (nconv == 0 && !(flags & SUPPRESS)) 377 *wcp = L'\0'; 378 if (nconv != (size_t)-2) { 379 nread += n; 380 width--; 381 if (!(flags & SUPPRESS)) 382 wcp++; 383 n = 0; 384 } 385 if (fp->_r <= 0 && __srefill(fp)) { 386 if (n != 0) { 387 fp->_flags |= __SERR; 388 goto input_failure; 389 } 390 break; 391 } 392 } 393 if (!(flags & SUPPRESS)) 394 nassigned++; 395 } else if (flags & SUPPRESS) { 396 size_t sum = 0; 397 for (;;) { 398 if ((n = fp->_r) < width) { 399 sum += n; 400 width -= n; 401 fp->_p += n; 402 if (__srefill(fp)) { 403 if (sum == 0) 404 goto input_failure; 405 break; 406 } 407 } else { 408 sum += width; 409 fp->_r -= width; 410 fp->_p += width; 411 break; 412 } 413 } 414 nread += sum; 415 } else { 416 size_t r = fread((void *)va_arg(ap, char *), 1, 417 width, fp); 418 419 if (r == 0) 420 goto input_failure; 421 nread += r; 422 nassigned++; 423 } 424 nconversions++; 425 break; 426 427 case CT_CCL: 428 /* scan a (nonempty) character class (sets NOSKIP) */ 429 if (width == 0) 430 width = (size_t)~0; /* `infinity' */ 431 /* take only those things in the class */ 432 if (flags & LONG) { 433 wchar_t twc; 434 int nchars; 435 436 if ((flags & SUPPRESS) == 0) 437 wcp = wcp0 = va_arg(ap, wchar_t *); 438 else 439 wcp = wcp0 = &twc; 440 n = 0; 441 nchars = 0; 442 while (width != 0) { 443 if (n == MB_CUR_MAX) { 444 fp->_flags |= __SERR; 445 goto input_failure; 446 } 447 buf[n++] = *fp->_p; 448 fp->_p++; 449 fp->_r--; 450 memset(&mbs, 0, sizeof(mbs)); 451 nconv = mbrtowc(wcp, buf, n, &mbs); 452 if (nconv == (size_t)-1) { 453 fp->_flags |= __SERR; 454 goto input_failure; 455 } 456 if (nconv == 0) 457 *wcp = L'\0'; 458 if (nconv != (size_t)-2) { 459 if (wctob(*wcp) != EOF && 460 !ccltab[wctob(*wcp)]) { 461 while (n != 0) { 462 n--; 463 __ungetc(buf[n], 464 fp); 465 } 466 break; 467 } 468 nread += n; 469 width--; 470 if (!(flags & SUPPRESS)) 471 wcp++; 472 nchars++; 473 n = 0; 474 } 475 if (fp->_r <= 0 && __srefill(fp)) { 476 if (n != 0) { 477 fp->_flags |= __SERR; 478 goto input_failure; 479 } 480 break; 481 } 482 } 483 if (n != 0) { 484 fp->_flags |= __SERR; 485 goto input_failure; 486 } 487 n = nchars; 488 if (n == 0) 489 goto match_failure; 490 if (!(flags & SUPPRESS)) { 491 *wcp = L'\0'; 492 nassigned++; 493 } 494 } else if (flags & SUPPRESS) { 495 n = 0; 496 while (ccltab[*fp->_p]) { 497 n++, fp->_r--, fp->_p++; 498 if (--width == 0) 499 break; 500 if (fp->_r <= 0 && __srefill(fp)) { 501 if (n == 0) 502 goto input_failure; 503 break; 504 } 505 } 506 if (n == 0) 507 goto match_failure; 508 } else { 509 p0 = p = va_arg(ap, char *); 510 while (ccltab[*fp->_p]) { 511 fp->_r--; 512 *p++ = *fp->_p++; 513 if (--width == 0) 514 break; 515 if (fp->_r <= 0 && __srefill(fp)) { 516 if (p == p0) 517 goto input_failure; 518 break; 519 } 520 } 521 n = p - p0; 522 if (n == 0) 523 goto match_failure; 524 *p = 0; 525 nassigned++; 526 } 527 nread += n; 528 nconversions++; 529 break; 530 531 case CT_STRING: 532 /* like CCL, but zero-length string OK, & no NOSKIP */ 533 if (width == 0) 534 width = (size_t)~0; 535 if (flags & LONG) { 536 wchar_t twc; 537 538 if ((flags & SUPPRESS) == 0) 539 wcp = va_arg(ap, wchar_t *); 540 else 541 wcp = &twc; 542 n = 0; 543 while (!isspace(*fp->_p) && width != 0) { 544 if (n == MB_CUR_MAX) { 545 fp->_flags |= __SERR; 546 goto input_failure; 547 } 548 buf[n++] = *fp->_p; 549 fp->_p++; 550 fp->_r--; 551 memset(&mbs, 0, sizeof(mbs)); 552 nconv = mbrtowc(wcp, buf, n, &mbs); 553 if (nconv == (size_t)-1) { 554 fp->_flags |= __SERR; 555 goto input_failure; 556 } 557 if (nconv == 0) 558 *wcp = L'\0'; 559 if (nconv != (size_t)-2) { 560 if (iswspace(*wcp)) { 561 while (n != 0) { 562 n--; 563 __ungetc(buf[n], 564 fp); 565 } 566 break; 567 } 568 nread += n; 569 width--; 570 if (!(flags & SUPPRESS)) 571 wcp++; 572 n = 0; 573 } 574 if (fp->_r <= 0 && __srefill(fp)) { 575 if (n != 0) { 576 fp->_flags |= __SERR; 577 goto input_failure; 578 } 579 break; 580 } 581 } 582 if (!(flags & SUPPRESS)) { 583 *wcp = L'\0'; 584 nassigned++; 585 } 586 } else if (flags & SUPPRESS) { 587 n = 0; 588 while (!isspace(*fp->_p)) { 589 n++, fp->_r--, fp->_p++; 590 if (--width == 0) 591 break; 592 if (fp->_r <= 0 && __srefill(fp)) 593 break; 594 } 595 nread += n; 596 } else { 597 p0 = p = va_arg(ap, char *); 598 while (!isspace(*fp->_p)) { 599 fp->_r--; 600 *p++ = *fp->_p++; 601 if (--width == 0) 602 break; 603 if (fp->_r <= 0 && __srefill(fp)) 604 break; 605 } 606 *p = 0; 607 nread += p - p0; 608 nassigned++; 609 } 610 nconversions++; 611 continue; 612 613 case CT_INT: 614 /* scan an integer as if by the conversion function */ 615 #ifdef hardway 616 if (width == 0 || width > sizeof(buf) - 1) 617 width = sizeof(buf) - 1; 618 #else 619 /* size_t is unsigned, hence this optimisation */ 620 if (--width > sizeof(buf) - 2) 621 width = sizeof(buf) - 2; 622 width++; 623 #endif 624 flags |= SIGNOK | NDIGITS | NZDIGITS; 625 for (p = buf; width; width--) { 626 c = *fp->_p; 627 /* 628 * Switch on the character; `goto ok' 629 * if we accept it as a part of number. 630 */ 631 switch (c) { 632 633 /* 634 * The digit 0 is always legal, but is 635 * special. For %i conversions, if no 636 * digits (zero or nonzero) have been 637 * scanned (only signs), we will have 638 * base==0. In that case, we should set 639 * it to 8 and enable 0x prefixing. 640 * Also, if we have not scanned zero digits 641 * before this, do not turn off prefixing 642 * (someone else will turn it off if we 643 * have scanned any nonzero digits). 644 */ 645 case '0': 646 if (base == 0) { 647 base = 8; 648 flags |= PFXOK; 649 } 650 if (flags & NZDIGITS) 651 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 652 else 653 flags &= ~(SIGNOK|PFXOK|NDIGITS); 654 goto ok; 655 656 /* 1 through 7 always legal */ 657 case '1': case '2': case '3': 658 case '4': case '5': case '6': case '7': 659 base = basefix[base]; 660 flags &= ~(SIGNOK | PFXOK | NDIGITS); 661 goto ok; 662 663 /* digits 8 and 9 ok iff decimal or hex */ 664 case '8': case '9': 665 base = basefix[base]; 666 if (base <= 8) 667 break; /* not legal here */ 668 flags &= ~(SIGNOK | PFXOK | NDIGITS); 669 goto ok; 670 671 /* letters ok iff hex */ 672 case 'A': case 'B': case 'C': 673 case 'D': case 'E': case 'F': 674 case 'a': case 'b': case 'c': 675 case 'd': case 'e': case 'f': 676 /* no need to fix base here */ 677 if (base <= 10) 678 break; /* not legal here */ 679 flags &= ~(SIGNOK | PFXOK | NDIGITS); 680 goto ok; 681 682 /* sign ok only as first character */ 683 case '+': case '-': 684 if (flags & SIGNOK) { 685 flags &= ~SIGNOK; 686 goto ok; 687 } 688 break; 689 690 /* x ok iff flag still set & 2nd char */ 691 case 'x': case 'X': 692 if (flags & PFXOK && p == buf + 1) { 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 #ifdef 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 if (__scanfdebug && p - buf != width) 783 abort(); 784 nassigned++; 785 } 786 nread += width; 787 nconversions++; 788 break; 789 #endif /* FLOATING_POINT */ 790 } 791 } 792 input_failure: 793 return (nconversions != 0 ? nassigned : EOF); 794 match_failure: 795 return (nassigned); 796 } 797 798 /* 799 * Fill in the given table from the scanset at the given format 800 * (just after `['). Return a pointer to the character past the 801 * closing `]'. The table has a 1 wherever characters should be 802 * considered part of the scanset. 803 */ 804 static const u_char * 805 __sccl(tab, fmt) 806 char *tab; 807 const u_char *fmt; 808 { 809 int c, n, v, i; 810 811 /* first `clear' the whole table */ 812 c = *fmt++; /* first char hat => negated scanset */ 813 if (c == '^') { 814 v = 1; /* default => accept */ 815 c = *fmt++; /* get new first char */ 816 } else 817 v = 0; /* default => reject */ 818 819 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ 820 (void) memset(tab, v, 256); 821 822 if (c == 0) 823 return (fmt - 1);/* format ended before closing ] */ 824 825 /* 826 * Now set the entries corresponding to the actual scanset 827 * to the opposite of the above. 828 * 829 * The first character may be ']' (or '-') without being special; 830 * the last character may be '-'. 831 */ 832 v = 1 - v; 833 for (;;) { 834 tab[c] = v; /* take character c */ 835 doswitch: 836 n = *fmt++; /* and examine the next */ 837 switch (n) { 838 839 case 0: /* format ended too soon */ 840 return (fmt - 1); 841 842 case '-': 843 /* 844 * A scanset of the form 845 * [01+-] 846 * is defined as `the digit 0, the digit 1, 847 * the character +, the character -', but 848 * the effect of a scanset such as 849 * [a-zA-Z0-9] 850 * is implementation defined. The V7 Unix 851 * scanf treats `a-z' as `the letters a through 852 * z', but treats `a-a' as `the letter a, the 853 * character -, and the letter a'. 854 * 855 * For compatibility, the `-' is not considerd 856 * to define a range if the character following 857 * it is either a close bracket (required by ANSI) 858 * or is not numerically greater than the character 859 * we just stored in the table (c). 860 */ 861 n = *fmt; 862 if (n == ']' 863 || (__collate_load_error ? n < c : 864 __collate_range_cmp (n, c) < 0 865 ) 866 ) { 867 c = '-'; 868 break; /* resume the for(;;) */ 869 } 870 fmt++; 871 /* fill in the range */ 872 if (__collate_load_error) { 873 do { 874 tab[++c] = v; 875 } while (c < n); 876 } else { 877 for (i = 0; i < 256; i ++) 878 if ( __collate_range_cmp (c, i) < 0 879 && __collate_range_cmp (i, n) <= 0 880 ) 881 tab[i] = v; 882 } 883 #if 1 /* XXX another disgusting compatibility hack */ 884 c = n; 885 /* 886 * Alas, the V7 Unix scanf also treats formats 887 * such as [a-c-e] as `the letters a through e'. 888 * This too is permitted by the standard.... 889 */ 890 goto doswitch; 891 #else 892 c = *fmt++; 893 if (c == 0) 894 return (fmt - 1); 895 if (c == ']') 896 return (fmt); 897 #endif 898 break; 899 900 case ']': /* end of scanset */ 901 return (fmt); 902 903 default: /* just another character */ 904 c = n; 905 break; 906 } 907 } 908 /* NOTREACHED */ 909 } 910 911 #ifdef FLOATING_POINT 912 static int 913 parsefloat(FILE *fp, char *buf, char *end) 914 { 915 char *commit, *p; 916 int infnanpos = 0; 917 enum { 918 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX, 919 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS 920 } state = S_START; 921 unsigned char c; 922 char decpt = *localeconv()->decimal_point; 923 _Bool gotmantdig = 0, ishex = 0; 924 925 /* 926 * We set commit = p whenever the string we have read so far 927 * constitutes a valid representation of a floating point 928 * number by itself. At some point, the parse will complete 929 * or fail, and we will ungetc() back to the last commit point. 930 * To ensure that the file offset gets updated properly, it is 931 * always necessary to read at least one character that doesn't 932 * match; thus, we can't short-circuit "infinity" or "nan(...)". 933 */ 934 commit = buf - 1; 935 for (p = buf; p < end; ) { 936 c = *fp->_p; 937 reswitch: 938 switch (state) { 939 case S_START: 940 state = S_GOTSIGN; 941 if (c == '-' || c == '+') 942 break; 943 else 944 goto reswitch; 945 case S_GOTSIGN: 946 switch (c) { 947 case '0': 948 state = S_MAYBEHEX; 949 commit = p; 950 break; 951 case 'I': 952 case 'i': 953 state = S_INF; 954 break; 955 case 'N': 956 case 'n': 957 state = S_NAN; 958 break; 959 default: 960 state = S_DIGITS; 961 goto reswitch; 962 } 963 break; 964 case S_INF: 965 if (infnanpos > 6 || 966 (c != "nfinity"[infnanpos] && 967 c != "NFINITY"[infnanpos])) 968 goto parsedone; 969 if (infnanpos == 1 || infnanpos == 6) 970 commit = p; /* inf or infinity */ 971 infnanpos++; 972 break; 973 case S_NAN: 974 switch (infnanpos) { 975 case -1: /* XXX kludge to deal with nan(...) */ 976 goto parsedone; 977 case 0: 978 if (c != 'A' && c != 'a') 979 goto parsedone; 980 break; 981 case 1: 982 if (c != 'N' && c != 'n') 983 goto parsedone; 984 else 985 commit = p; 986 break; 987 case 2: 988 if (c != '(') 989 goto parsedone; 990 break; 991 default: 992 if (c == ')') { 993 commit = p; 994 infnanpos = -2; 995 } else if (!isalnum(c) && c != '_') 996 goto parsedone; 997 break; 998 } 999 infnanpos++; 1000 break; 1001 case S_MAYBEHEX: 1002 state = S_DIGITS; 1003 if (c == 'X' || c == 'x') { 1004 ishex = 1; 1005 break; 1006 } else { /* we saw a '0', but no 'x' */ 1007 gotmantdig = 1; 1008 goto reswitch; 1009 } 1010 case S_DIGITS: 1011 if (ishex && isxdigit(c) || isdigit(c)) 1012 gotmantdig = 1; 1013 else { 1014 state = S_FRAC; 1015 if (c != decpt) 1016 goto reswitch; 1017 } 1018 if (gotmantdig) 1019 commit = p; 1020 break; 1021 case S_FRAC: 1022 if ((c == 'E' || c == 'e') && !ishex || 1023 (c == 'P' || c == 'p') && ishex) { 1024 if (!gotmantdig) 1025 goto parsedone; 1026 else 1027 state = S_EXP; 1028 } else if (ishex && isxdigit(c) || isdigit(c)) { 1029 commit = p; 1030 gotmantdig = 1; 1031 } else 1032 goto parsedone; 1033 break; 1034 case S_EXP: 1035 state = S_EXPDIGITS; 1036 if (c == '-' || c == '+') 1037 break; 1038 else 1039 goto reswitch; 1040 case S_EXPDIGITS: 1041 if (isdigit(c)) 1042 commit = p; 1043 else 1044 goto parsedone; 1045 break; 1046 default: 1047 abort(); 1048 } 1049 *p++ = c; 1050 if (--fp->_r > 0) 1051 fp->_p++; 1052 else if (__srefill(fp)) 1053 break; /* EOF */ 1054 } 1055 1056 parsedone: 1057 while (commit < --p) 1058 __ungetc(*(u_char *)p, fp); 1059 *++commit = '\0'; 1060 return (commit - buf); 1061 } 1062 #endif 1063