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 #include "floatio.h" 64 #endif 65 66 #define BUF 513 /* Maximum length of numeric string. */ 67 68 /* 69 * Flags used during conversion. 70 */ 71 #define LONG 0x01 /* l: long or double */ 72 #define LONGDBL 0x02 /* L: long double */ 73 #define SHORT 0x04 /* h: short */ 74 #define SUPPRESS 0x08 /* *: suppress assignment */ 75 #define POINTER 0x10 /* p: void * (as hex) */ 76 #define NOSKIP 0x20 /* [ or c: do not skip blanks */ 77 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 78 #define INTMAXT 0x800 /* j: intmax_t */ 79 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 80 #define SIZET 0x2000 /* z: size_t */ 81 #define SHORTSHORT 0x4000 /* hh: char */ 82 #define UNSIGNED 0x8000 /* %[oupxX] conversions */ 83 84 /* 85 * The following are used in numeric conversions only: 86 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 87 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 88 */ 89 #define SIGNOK 0x40 /* +/- is (still) legal */ 90 #define NDIGITS 0x80 /* no digits detected */ 91 92 #define DPTOK 0x100 /* (float) decimal point is still legal */ 93 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ 94 95 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 96 #define NZDIGITS 0x200 /* no zero digits detected */ 97 98 /* 99 * Conversion types. 100 */ 101 #define CT_CHAR 0 /* %c conversion */ 102 #define CT_CCL 1 /* %[...] conversion */ 103 #define CT_STRING 2 /* %s conversion */ 104 #define CT_INT 3 /* %[dioupxX] conversion */ 105 #define CT_FLOAT 4 /* %[efgEFG] conversion */ 106 107 static const u_char *__sccl(char *, const u_char *); 108 109 __weak_reference(__vfscanf, vfscanf); 110 111 /* 112 * __vfscanf - MT-safe version 113 */ 114 int 115 __vfscanf(FILE *fp, char const *fmt0, va_list ap) 116 { 117 int ret; 118 119 FLOCKFILE(fp); 120 ret = __svfscanf(fp, fmt0, ap); 121 FUNLOCKFILE(fp); 122 return (ret); 123 } 124 125 /* 126 * __svfscanf - non-MT-safe version of __vfscanf 127 */ 128 int 129 __svfscanf(FILE *fp, const char *fmt0, va_list ap) 130 { 131 const u_char *fmt = (const u_char *)fmt0; 132 int c; /* character from format, or conversion */ 133 size_t width; /* field width, or 0 */ 134 char *p; /* points into all kinds of strings */ 135 int n; /* handy integer */ 136 int flags; /* flags as defined above */ 137 char *p0; /* saves original value of p when necessary */ 138 int nassigned; /* number of fields assigned */ 139 int nconversions; /* number of conversions */ 140 int nread; /* number of characters consumed from fp */ 141 int base; /* base argument to conversion function */ 142 char ccltab[256]; /* character class table for %[...] */ 143 char buf[BUF]; /* buffer for numeric and mb conversions */ 144 wchar_t *wcp; /* handy wide character pointer */ 145 wchar_t *wcp0; /* saves original value of wcp */ 146 mbstate_t mbs; /* multibyte conversion state */ 147 size_t nconv; /* length of multibyte sequence converted */ 148 149 /* `basefix' is used to avoid `if' tests in the integer scanner */ 150 static short basefix[17] = 151 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 152 #ifdef FLOATING_POINT 153 char decimal_point = localeconv()->decimal_point[0]; 154 #endif 155 156 ORIENT(fp, -1); 157 158 nassigned = 0; 159 nconversions = 0; 160 nread = 0; 161 for (;;) { 162 c = *fmt++; 163 if (c == 0) 164 return (nassigned); 165 if (isspace(c)) { 166 while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p)) 167 nread++, fp->_r--, fp->_p++; 168 continue; 169 } 170 if (c != '%') 171 goto literal; 172 width = 0; 173 flags = 0; 174 /* 175 * switch on the format. continue if done; 176 * break once format type is derived. 177 */ 178 again: c = *fmt++; 179 switch (c) { 180 case '%': 181 literal: 182 if (fp->_r <= 0 && __srefill(fp)) 183 goto input_failure; 184 if (*fp->_p != c) 185 goto match_failure; 186 fp->_r--, fp->_p++; 187 nread++; 188 continue; 189 190 case '*': 191 flags |= SUPPRESS; 192 goto again; 193 case 'j': 194 flags |= INTMAXT; 195 goto again; 196 case 'l': 197 if (flags & LONG) { 198 flags &= ~LONG; 199 flags |= LONGLONG; 200 } else 201 flags |= LONG; 202 goto again; 203 case 'q': 204 flags |= LONGLONG; /* not quite */ 205 goto again; 206 case 't': 207 flags |= PTRDIFFT; 208 goto again; 209 case 'z': 210 flags |= SIZET; 211 goto again; 212 case 'L': 213 flags |= LONGDBL; 214 goto again; 215 case 'h': 216 if (flags & SHORT) { 217 flags &= ~SHORT; 218 flags |= SHORTSHORT; 219 } else 220 flags |= SHORT; 221 goto again; 222 223 case '0': case '1': case '2': case '3': case '4': 224 case '5': case '6': case '7': case '8': case '9': 225 width = width * 10 + c - '0'; 226 goto again; 227 228 /* 229 * Conversions. 230 */ 231 case 'd': 232 c = CT_INT; 233 base = 10; 234 break; 235 236 case 'i': 237 c = CT_INT; 238 base = 0; 239 break; 240 241 case 'o': 242 c = CT_INT; 243 flags |= UNSIGNED; 244 base = 8; 245 break; 246 247 case 'u': 248 c = CT_INT; 249 flags |= UNSIGNED; 250 base = 10; 251 break; 252 253 case 'X': 254 case 'x': 255 flags |= PFXOK; /* enable 0x prefixing */ 256 c = CT_INT; 257 flags |= UNSIGNED; 258 base = 16; 259 break; 260 261 #ifdef FLOATING_POINT 262 case 'E': case 'F': case 'G': 263 case 'e': case 'f': case 'g': 264 c = CT_FLOAT; 265 break; 266 #endif 267 268 case 'S': 269 flags |= LONG; 270 /* FALLTHROUGH */ 271 case 's': 272 c = CT_STRING; 273 break; 274 275 case '[': 276 fmt = __sccl(ccltab, fmt); 277 flags |= NOSKIP; 278 c = CT_CCL; 279 break; 280 281 case 'C': 282 flags |= LONG; 283 /* FALLTHROUGH */ 284 case 'c': 285 flags |= NOSKIP; 286 c = CT_CHAR; 287 break; 288 289 case 'p': /* pointer format is like hex */ 290 flags |= POINTER | PFXOK; 291 c = CT_INT; /* assumes sizeof(uintmax_t) */ 292 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 293 base = 16; 294 break; 295 296 case 'n': 297 nconversions++; 298 if (flags & SUPPRESS) /* ??? */ 299 continue; 300 if (flags & SHORTSHORT) 301 *va_arg(ap, char *) = nread; 302 else if (flags & SHORT) 303 *va_arg(ap, short *) = nread; 304 else if (flags & LONG) 305 *va_arg(ap, long *) = nread; 306 else if (flags & LONGLONG) 307 *va_arg(ap, long long *) = nread; 308 else if (flags & INTMAXT) 309 *va_arg(ap, intmax_t *) = nread; 310 else if (flags & SIZET) 311 *va_arg(ap, size_t *) = nread; 312 else if (flags & PTRDIFFT) 313 *va_arg(ap, ptrdiff_t *) = nread; 314 else 315 *va_arg(ap, int *) = nread; 316 continue; 317 318 default: 319 goto match_failure; 320 321 /* 322 * Disgusting backwards compatibility hack. XXX 323 */ 324 case '\0': /* compat */ 325 return (EOF); 326 } 327 328 /* 329 * We have a conversion that requires input. 330 */ 331 if (fp->_r <= 0 && __srefill(fp)) 332 goto input_failure; 333 334 /* 335 * Consume leading white space, except for formats 336 * that suppress this. 337 */ 338 if ((flags & NOSKIP) == 0) { 339 while (isspace(*fp->_p)) { 340 nread++; 341 if (--fp->_r > 0) 342 fp->_p++; 343 else if (__srefill(fp)) 344 goto input_failure; 345 } 346 /* 347 * Note that there is at least one character in 348 * the buffer, so conversions that do not set NOSKIP 349 * ca no longer result in an input failure. 350 */ 351 } 352 353 /* 354 * Do the conversion. 355 */ 356 switch (c) { 357 358 case CT_CHAR: 359 /* scan arbitrary characters (sets NOSKIP) */ 360 if (width == 0) 361 width = 1; 362 if (flags & LONG) { 363 if ((flags & SUPPRESS) == 0) 364 wcp = va_arg(ap, wchar_t *); 365 else 366 wcp = NULL; 367 n = 0; 368 while (width != 0) { 369 if (n == MB_CUR_MAX) { 370 fp->_flags |= __SERR; 371 goto input_failure; 372 } 373 buf[n++] = *fp->_p; 374 fp->_p++; 375 fp->_r--; 376 memset(&mbs, 0, sizeof(mbs)); 377 nconv = mbrtowc(wcp, buf, n, &mbs); 378 if (nconv == (size_t)-1) { 379 fp->_flags |= __SERR; 380 goto input_failure; 381 } 382 if (nconv == 0 && !(flags & SUPPRESS)) 383 *wcp = L'\0'; 384 if (nconv != (size_t)-2) { 385 nread += n; 386 width--; 387 if (!(flags & SUPPRESS)) 388 wcp++; 389 n = 0; 390 } 391 if (fp->_r <= 0 && __srefill(fp)) { 392 if (n != 0) { 393 fp->_flags |= __SERR; 394 goto input_failure; 395 } 396 break; 397 } 398 } 399 if (!(flags & SUPPRESS)) 400 nassigned++; 401 } else if (flags & SUPPRESS) { 402 size_t sum = 0; 403 for (;;) { 404 if ((n = fp->_r) < width) { 405 sum += n; 406 width -= n; 407 fp->_p += n; 408 if (__srefill(fp)) { 409 if (sum == 0) 410 goto input_failure; 411 break; 412 } 413 } else { 414 sum += width; 415 fp->_r -= width; 416 fp->_p += width; 417 break; 418 } 419 } 420 nread += sum; 421 } else { 422 size_t r = fread((void *)va_arg(ap, char *), 1, 423 width, fp); 424 425 if (r == 0) 426 goto input_failure; 427 nread += r; 428 nassigned++; 429 } 430 nconversions++; 431 break; 432 433 case CT_CCL: 434 /* scan a (nonempty) character class (sets NOSKIP) */ 435 if (width == 0) 436 width = (size_t)~0; /* `infinity' */ 437 /* take only those things in the class */ 438 if (flags & LONG) { 439 wchar_t twc; 440 int nchars; 441 442 if ((flags & SUPPRESS) == 0) 443 wcp = wcp0 = va_arg(ap, wchar_t *); 444 else 445 wcp = wcp0 = &twc; 446 n = 0; 447 nchars = 0; 448 while (width != 0) { 449 if (n == MB_CUR_MAX) { 450 fp->_flags |= __SERR; 451 goto input_failure; 452 } 453 buf[n++] = *fp->_p; 454 fp->_p++; 455 fp->_r--; 456 memset(&mbs, 0, sizeof(mbs)); 457 nconv = mbrtowc(wcp, buf, n, &mbs); 458 if (nconv == (size_t)-1) { 459 fp->_flags |= __SERR; 460 goto input_failure; 461 } 462 if (nconv == 0) 463 *wcp = L'\0'; 464 if (nconv != (size_t)-2) { 465 if (wctob(*wcp) != EOF && 466 !ccltab[wctob(*wcp)]) { 467 while (n != 0) { 468 n--; 469 __ungetc(buf[n], 470 fp); 471 } 472 break; 473 } 474 nread += n; 475 width--; 476 if (!(flags & SUPPRESS)) 477 wcp++; 478 nchars++; 479 n = 0; 480 } 481 if (fp->_r <= 0 && __srefill(fp)) { 482 if (n != 0) { 483 fp->_flags |= __SERR; 484 goto input_failure; 485 } 486 break; 487 } 488 } 489 if (n != 0) { 490 fp->_flags |= __SERR; 491 goto input_failure; 492 } 493 n = nchars; 494 if (n == 0) 495 goto match_failure; 496 if (!(flags & SUPPRESS)) { 497 *wcp = L'\0'; 498 nassigned++; 499 } 500 } else if (flags & SUPPRESS) { 501 n = 0; 502 while (ccltab[*fp->_p]) { 503 n++, fp->_r--, fp->_p++; 504 if (--width == 0) 505 break; 506 if (fp->_r <= 0 && __srefill(fp)) { 507 if (n == 0) 508 goto input_failure; 509 break; 510 } 511 } 512 if (n == 0) 513 goto match_failure; 514 } else { 515 p0 = p = va_arg(ap, char *); 516 while (ccltab[*fp->_p]) { 517 fp->_r--; 518 *p++ = *fp->_p++; 519 if (--width == 0) 520 break; 521 if (fp->_r <= 0 && __srefill(fp)) { 522 if (p == p0) 523 goto input_failure; 524 break; 525 } 526 } 527 n = p - p0; 528 if (n == 0) 529 goto match_failure; 530 *p = 0; 531 nassigned++; 532 } 533 nread += n; 534 nconversions++; 535 break; 536 537 case CT_STRING: 538 /* like CCL, but zero-length string OK, & no NOSKIP */ 539 if (width == 0) 540 width = (size_t)~0; 541 if (flags & LONG) { 542 wchar_t twc; 543 544 if ((flags & SUPPRESS) == 0) 545 wcp = va_arg(ap, wchar_t *); 546 else 547 wcp = &twc; 548 n = 0; 549 while (!isspace(*fp->_p) && width != 0) { 550 if (n == MB_CUR_MAX) { 551 fp->_flags |= __SERR; 552 goto input_failure; 553 } 554 buf[n++] = *fp->_p; 555 fp->_p++; 556 fp->_r--; 557 memset(&mbs, 0, sizeof(mbs)); 558 nconv = mbrtowc(wcp, buf, n, &mbs); 559 if (nconv == (size_t)-1) { 560 fp->_flags |= __SERR; 561 goto input_failure; 562 } 563 if (nconv == 0) 564 *wcp = L'\0'; 565 if (nconv != (size_t)-2) { 566 if (iswspace(*wcp)) { 567 while (n != 0) { 568 n--; 569 __ungetc(buf[n], 570 fp); 571 } 572 break; 573 } 574 nread += n; 575 width--; 576 if (!(flags & SUPPRESS)) 577 wcp++; 578 n = 0; 579 } 580 if (fp->_r <= 0 && __srefill(fp)) { 581 if (n != 0) { 582 fp->_flags |= __SERR; 583 goto input_failure; 584 } 585 break; 586 } 587 } 588 if (!(flags & SUPPRESS)) { 589 *wcp = L'\0'; 590 nassigned++; 591 } 592 } else if (flags & SUPPRESS) { 593 n = 0; 594 while (!isspace(*fp->_p)) { 595 n++, fp->_r--, fp->_p++; 596 if (--width == 0) 597 break; 598 if (fp->_r <= 0 && __srefill(fp)) 599 break; 600 } 601 nread += n; 602 } else { 603 p0 = p = va_arg(ap, char *); 604 while (!isspace(*fp->_p)) { 605 fp->_r--; 606 *p++ = *fp->_p++; 607 if (--width == 0) 608 break; 609 if (fp->_r <= 0 && __srefill(fp)) 610 break; 611 } 612 *p = 0; 613 nread += p - p0; 614 nassigned++; 615 } 616 nconversions++; 617 continue; 618 619 case CT_INT: 620 /* scan an integer as if by the conversion function */ 621 #ifdef hardway 622 if (width == 0 || width > sizeof(buf) - 1) 623 width = sizeof(buf) - 1; 624 #else 625 /* size_t is unsigned, hence this optimisation */ 626 if (--width > sizeof(buf) - 2) 627 width = sizeof(buf) - 2; 628 width++; 629 #endif 630 flags |= SIGNOK | NDIGITS | NZDIGITS; 631 for (p = buf; width; width--) { 632 c = *fp->_p; 633 /* 634 * Switch on the character; `goto ok' 635 * if we accept it as a part of number. 636 */ 637 switch (c) { 638 639 /* 640 * The digit 0 is always legal, but is 641 * special. For %i conversions, if no 642 * digits (zero or nonzero) have been 643 * scanned (only signs), we will have 644 * base==0. In that case, we should set 645 * it to 8 and enable 0x prefixing. 646 * Also, if we have not scanned zero digits 647 * before this, do not turn off prefixing 648 * (someone else will turn it off if we 649 * have scanned any nonzero digits). 650 */ 651 case '0': 652 if (base == 0) { 653 base = 8; 654 flags |= PFXOK; 655 } 656 if (flags & NZDIGITS) 657 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 658 else 659 flags &= ~(SIGNOK|PFXOK|NDIGITS); 660 goto ok; 661 662 /* 1 through 7 always legal */ 663 case '1': case '2': case '3': 664 case '4': case '5': case '6': case '7': 665 base = basefix[base]; 666 flags &= ~(SIGNOK | PFXOK | NDIGITS); 667 goto ok; 668 669 /* digits 8 and 9 ok iff decimal or hex */ 670 case '8': case '9': 671 base = basefix[base]; 672 if (base <= 8) 673 break; /* not legal here */ 674 flags &= ~(SIGNOK | PFXOK | NDIGITS); 675 goto ok; 676 677 /* letters ok iff hex */ 678 case 'A': case 'B': case 'C': 679 case 'D': case 'E': case 'F': 680 case 'a': case 'b': case 'c': 681 case 'd': case 'e': case 'f': 682 /* no need to fix base here */ 683 if (base <= 10) 684 break; /* not legal here */ 685 flags &= ~(SIGNOK | PFXOK | NDIGITS); 686 goto ok; 687 688 /* sign ok only as first character */ 689 case '+': case '-': 690 if (flags & SIGNOK) { 691 flags &= ~SIGNOK; 692 goto ok; 693 } 694 break; 695 696 /* x ok iff flag still set & 2nd char */ 697 case 'x': case 'X': 698 if (flags & PFXOK && p == buf + 1) { 699 base = 16; /* if %i */ 700 flags &= ~PFXOK; 701 goto ok; 702 } 703 break; 704 } 705 706 /* 707 * If we got here, c is not a legal character 708 * for a number. Stop accumulating digits. 709 */ 710 break; 711 ok: 712 /* 713 * c is legal: store it and look at the next. 714 */ 715 *p++ = c; 716 if (--fp->_r > 0) 717 fp->_p++; 718 else if (__srefill(fp)) 719 break; /* EOF */ 720 } 721 /* 722 * If we had only a sign, it is no good; push 723 * back the sign. If the number ends in `x', 724 * it was [sign] '0' 'x', so push back the x 725 * and treat it as [sign] '0'. 726 */ 727 if (flags & NDIGITS) { 728 if (p > buf) 729 (void) __ungetc(*(u_char *)--p, fp); 730 goto match_failure; 731 } 732 c = ((u_char *)p)[-1]; 733 if (c == 'x' || c == 'X') { 734 --p; 735 (void) __ungetc(c, fp); 736 } 737 if ((flags & SUPPRESS) == 0) { 738 uintmax_t res; 739 740 *p = 0; 741 if ((flags & UNSIGNED) == 0) 742 res = strtoimax(buf, (char **)NULL, base); 743 else 744 res = strtoumax(buf, (char **)NULL, base); 745 if (flags & POINTER) 746 *va_arg(ap, void **) = 747 (void *)(uintptr_t)res; 748 else if (flags & SHORTSHORT) 749 *va_arg(ap, char *) = res; 750 else if (flags & SHORT) 751 *va_arg(ap, short *) = res; 752 else if (flags & LONG) 753 *va_arg(ap, long *) = res; 754 else if (flags & LONGLONG) 755 *va_arg(ap, long long *) = res; 756 else if (flags & INTMAXT) 757 *va_arg(ap, intmax_t *) = res; 758 else if (flags & PTRDIFFT) 759 *va_arg(ap, ptrdiff_t *) = res; 760 else if (flags & SIZET) 761 *va_arg(ap, size_t *) = res; 762 else 763 *va_arg(ap, int *) = res; 764 nassigned++; 765 } 766 nread += p - buf; 767 nconversions++; 768 break; 769 770 #ifdef FLOATING_POINT 771 case CT_FLOAT: 772 /* scan a floating point number as if by strtod */ 773 #ifdef hardway 774 if (width == 0 || width > sizeof(buf) - 1) 775 width = sizeof(buf) - 1; 776 #else 777 /* size_t is unsigned, hence this optimisation */ 778 if (--width > sizeof(buf) - 2) 779 width = sizeof(buf) - 2; 780 width++; 781 #endif 782 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 783 for (p = buf; width; width--) { 784 c = *fp->_p; 785 /* 786 * This code mimicks the integer conversion 787 * code, but is much simpler. 788 */ 789 switch (c) { 790 791 case '0': case '1': case '2': case '3': 792 case '4': case '5': case '6': case '7': 793 case '8': case '9': 794 flags &= ~(SIGNOK | NDIGITS); 795 goto fok; 796 797 case '+': case '-': 798 if (flags & SIGNOK) { 799 flags &= ~SIGNOK; 800 goto fok; 801 } 802 break; 803 case 'e': case 'E': 804 /* no exponent without some digits */ 805 if ((flags&(NDIGITS|EXPOK)) == EXPOK) { 806 flags = 807 (flags & ~(EXPOK|DPTOK)) | 808 SIGNOK | NDIGITS; 809 goto fok; 810 } 811 break; 812 default: 813 if ((char)c == decimal_point && 814 (flags & DPTOK)) { 815 flags &= ~(SIGNOK | DPTOK); 816 goto fok; 817 } 818 break; 819 } 820 break; 821 fok: 822 *p++ = c; 823 if (--fp->_r > 0) 824 fp->_p++; 825 else if (__srefill(fp)) 826 break; /* EOF */ 827 } 828 /* 829 * If no digits, might be missing exponent digits 830 * (just give back the exponent) or might be missing 831 * regular digits, but had sign and/or decimal point. 832 */ 833 if (flags & NDIGITS) { 834 if (flags & EXPOK) { 835 /* no digits at all */ 836 while (p > buf) 837 __ungetc(*(u_char *)--p, fp); 838 goto match_failure; 839 } 840 /* just a bad exponent (e and maybe sign) */ 841 c = *(u_char *)--p; 842 if (c != 'e' && c != 'E') { 843 (void) __ungetc(c, fp);/* sign */ 844 c = *(u_char *)--p; 845 } 846 (void) __ungetc(c, fp); 847 } 848 if ((flags & SUPPRESS) == 0) { 849 double res; 850 851 *p = 0; 852 /* XXX this loses precision for long doubles. */ 853 res = strtod(buf, (char **) NULL); 854 if (flags & LONGDBL) 855 *va_arg(ap, long double *) = res; 856 else if (flags & LONG) 857 *va_arg(ap, double *) = res; 858 else 859 *va_arg(ap, float *) = res; 860 nassigned++; 861 } 862 nread += p - buf; 863 nconversions++; 864 break; 865 #endif /* FLOATING_POINT */ 866 } 867 } 868 input_failure: 869 return (nconversions != 0 ? nassigned : EOF); 870 match_failure: 871 return (nassigned); 872 } 873 874 /* 875 * Fill in the given table from the scanset at the given format 876 * (just after `['). Return a pointer to the character past the 877 * closing `]'. The table has a 1 wherever characters should be 878 * considered part of the scanset. 879 */ 880 static const u_char * 881 __sccl(tab, fmt) 882 char *tab; 883 const u_char *fmt; 884 { 885 int c, n, v, i; 886 887 /* first `clear' the whole table */ 888 c = *fmt++; /* first char hat => negated scanset */ 889 if (c == '^') { 890 v = 1; /* default => accept */ 891 c = *fmt++; /* get new first char */ 892 } else 893 v = 0; /* default => reject */ 894 895 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ 896 (void) memset(tab, v, 256); 897 898 if (c == 0) 899 return (fmt - 1);/* format ended before closing ] */ 900 901 /* 902 * Now set the entries corresponding to the actual scanset 903 * to the opposite of the above. 904 * 905 * The first character may be ']' (or '-') without being special; 906 * the last character may be '-'. 907 */ 908 v = 1 - v; 909 for (;;) { 910 tab[c] = v; /* take character c */ 911 doswitch: 912 n = *fmt++; /* and examine the next */ 913 switch (n) { 914 915 case 0: /* format ended too soon */ 916 return (fmt - 1); 917 918 case '-': 919 /* 920 * A scanset of the form 921 * [01+-] 922 * is defined as `the digit 0, the digit 1, 923 * the character +, the character -', but 924 * the effect of a scanset such as 925 * [a-zA-Z0-9] 926 * is implementation defined. The V7 Unix 927 * scanf treats `a-z' as `the letters a through 928 * z', but treats `a-a' as `the letter a, the 929 * character -, and the letter a'. 930 * 931 * For compatibility, the `-' is not considerd 932 * to define a range if the character following 933 * it is either a close bracket (required by ANSI) 934 * or is not numerically greater than the character 935 * we just stored in the table (c). 936 */ 937 n = *fmt; 938 if (n == ']' 939 || (__collate_load_error ? n < c : 940 __collate_range_cmp (n, c) < 0 941 ) 942 ) { 943 c = '-'; 944 break; /* resume the for(;;) */ 945 } 946 fmt++; 947 /* fill in the range */ 948 if (__collate_load_error) { 949 do { 950 tab[++c] = v; 951 } while (c < n); 952 } else { 953 for (i = 0; i < 256; i ++) 954 if ( __collate_range_cmp (c, i) < 0 955 && __collate_range_cmp (i, n) <= 0 956 ) 957 tab[i] = v; 958 } 959 #if 1 /* XXX another disgusting compatibility hack */ 960 c = n; 961 /* 962 * Alas, the V7 Unix scanf also treats formats 963 * such as [a-c-e] as `the letters a through e'. 964 * This too is permitted by the standard.... 965 */ 966 goto doswitch; 967 #else 968 c = *fmt++; 969 if (c == 0) 970 return (fmt - 1); 971 if (c == ']') 972 return (fmt); 973 #endif 974 break; 975 976 case ']': /* end of scanset */ 977 return (fmt); 978 979 default: /* just another character */ 980 c = n; 981 break; 982 } 983 } 984 /* NOTREACHED */ 985 } 986