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