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