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 "un-namespace.h" 52 53 #include "collate.h" 54 #include "libc_private.h" 55 #include "local.h" 56 57 #define FLOATING_POINT 58 59 #ifdef FLOATING_POINT 60 #include <locale.h> 61 #include "floatio.h" 62 #endif 63 64 #define BUF 513 /* Maximum length of numeric string. */ 65 66 /* 67 * Flags used during conversion. 68 */ 69 #define LONG 0x01 /* l: long or double */ 70 #define LONGDBL 0x02 /* L: long double */ 71 #define SHORT 0x04 /* h: short */ 72 #define SUPPRESS 0x08 /* *: suppress assignment */ 73 #define POINTER 0x10 /* p: void * (as hex) */ 74 #define NOSKIP 0x20 /* [ or c: do not skip blanks */ 75 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ 76 #define INTMAXT 0x800 /* j: intmax_t */ 77 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */ 78 #define SIZET 0x2000 /* z: size_t */ 79 #define SHORTSHORT 0x4000 /* hh: char */ 80 #define UNSIGNED 0x8000 /* %[oupxX] conversions */ 81 82 /* 83 * The following are used in numeric conversions only: 84 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 85 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 86 */ 87 #define SIGNOK 0x40 /* +/- is (still) legal */ 88 #define NDIGITS 0x80 /* no digits detected */ 89 90 #define DPTOK 0x100 /* (float) decimal point is still legal */ 91 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ 92 93 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 94 #define NZDIGITS 0x200 /* no zero digits detected */ 95 96 /* 97 * Conversion types. 98 */ 99 #define CT_CHAR 0 /* %c conversion */ 100 #define CT_CCL 1 /* %[...] conversion */ 101 #define CT_STRING 2 /* %s conversion */ 102 #define CT_INT 3 /* %[dioupxX] conversion */ 103 #define CT_FLOAT 4 /* %[efgEFG] conversion */ 104 105 static const u_char *__sccl(char *, const u_char *); 106 107 /* 108 * __vfscanf - MT-safe version 109 */ 110 int 111 __vfscanf(FILE *fp, char const *fmt0, va_list ap) 112 { 113 int ret; 114 115 FLOCKFILE(fp); 116 ret = __svfscanf(fp, fmt0, ap); 117 FUNLOCKFILE(fp); 118 return (ret); 119 } 120 121 /* 122 * __svfscanf - non-MT-safe version of __vfscanf 123 */ 124 int 125 __svfscanf(FILE *fp, const char *fmt0, va_list ap) 126 { 127 const u_char *fmt = (const u_char *)fmt0; 128 int c; /* character from format, or conversion */ 129 size_t width; /* field width, or 0 */ 130 char *p; /* points into all kinds of strings */ 131 int n; /* handy integer */ 132 int flags; /* flags as defined above */ 133 char *p0; /* saves original value of p when necessary */ 134 int nassigned; /* number of fields assigned */ 135 int nconversions; /* number of conversions */ 136 int nread; /* number of characters consumed from fp */ 137 int base; /* base argument to conversion function */ 138 char ccltab[256]; /* character class table for %[...] */ 139 char buf[BUF]; /* buffer for numeric conversions */ 140 141 /* `basefix' is used to avoid `if' tests in the integer scanner */ 142 static short basefix[17] = 143 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 144 #ifdef FLOATING_POINT 145 char decimal_point = localeconv()->decimal_point[0]; 146 #endif 147 148 ORIENT(fp, -1); 149 150 nassigned = 0; 151 nconversions = 0; 152 nread = 0; 153 for (;;) { 154 c = *fmt++; 155 if (c == 0) 156 return (nassigned); 157 if (isspace(c)) { 158 while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p)) 159 nread++, fp->_r--, fp->_p++; 160 continue; 161 } 162 if (c != '%') 163 goto literal; 164 width = 0; 165 flags = 0; 166 /* 167 * switch on the format. continue if done; 168 * break once format type is derived. 169 */ 170 again: c = *fmt++; 171 switch (c) { 172 case '%': 173 literal: 174 if (fp->_r <= 0 && __srefill(fp)) 175 goto input_failure; 176 if (*fp->_p != c) 177 goto match_failure; 178 fp->_r--, fp->_p++; 179 nread++; 180 continue; 181 182 case '*': 183 flags |= SUPPRESS; 184 goto again; 185 case 'j': 186 flags |= INTMAXT; 187 goto again; 188 case 'l': 189 if (flags & LONG) { 190 flags &= ~LONG; 191 flags |= LONGLONG; 192 } else 193 flags |= LONG; 194 goto again; 195 case 'q': 196 flags |= LONGLONG; /* not quite */ 197 goto again; 198 case 't': 199 flags |= PTRDIFFT; 200 goto again; 201 case 'z': 202 flags |= SIZET; 203 goto again; 204 case 'L': 205 flags |= LONGDBL; 206 goto again; 207 case 'h': 208 if (flags & SHORT) { 209 flags &= ~SHORT; 210 flags |= SHORTSHORT; 211 } else 212 flags |= SHORT; 213 goto again; 214 215 case '0': case '1': case '2': case '3': case '4': 216 case '5': case '6': case '7': case '8': case '9': 217 width = width * 10 + c - '0'; 218 goto again; 219 220 /* 221 * Conversions. 222 */ 223 case 'd': 224 c = CT_INT; 225 base = 10; 226 break; 227 228 case 'i': 229 c = CT_INT; 230 base = 0; 231 break; 232 233 case 'o': 234 c = CT_INT; 235 flags |= UNSIGNED; 236 base = 8; 237 break; 238 239 case 'u': 240 c = CT_INT; 241 flags |= UNSIGNED; 242 base = 10; 243 break; 244 245 case 'X': 246 case 'x': 247 flags |= PFXOK; /* enable 0x prefixing */ 248 c = CT_INT; 249 flags |= UNSIGNED; 250 base = 16; 251 break; 252 253 #ifdef FLOATING_POINT 254 case 'E': case 'F': case 'G': 255 case 'e': case 'f': case 'g': 256 c = CT_FLOAT; 257 break; 258 #endif 259 260 case 'S': 261 flags |= LONG; 262 /* FALLTHROUGH */ 263 case 's': 264 c = CT_STRING; 265 break; 266 267 case '[': 268 fmt = __sccl(ccltab, fmt); 269 flags |= NOSKIP; 270 c = CT_CCL; 271 break; 272 273 case 'C': 274 flags |= LONG; 275 /* FALLTHROUGH */ 276 case 'c': 277 flags |= NOSKIP; 278 c = CT_CHAR; 279 break; 280 281 case 'p': /* pointer format is like hex */ 282 flags |= POINTER | PFXOK; 283 c = CT_INT; /* assumes sizeof(uintmax_t) */ 284 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ 285 base = 16; 286 break; 287 288 case 'n': 289 nconversions++; 290 if (flags & SUPPRESS) /* ??? */ 291 continue; 292 if (flags & SHORTSHORT) 293 *va_arg(ap, char *) = nread; 294 else if (flags & SHORT) 295 *va_arg(ap, short *) = nread; 296 else if (flags & LONG) 297 *va_arg(ap, long *) = nread; 298 else if (flags & LONGLONG) 299 *va_arg(ap, long long *) = nread; 300 else if (flags & INTMAXT) 301 *va_arg(ap, intmax_t *) = nread; 302 else if (flags & SIZET) 303 *va_arg(ap, size_t *) = nread; 304 else if (flags & PTRDIFFT) 305 *va_arg(ap, ptrdiff_t *) = nread; 306 else 307 *va_arg(ap, int *) = nread; 308 continue; 309 310 default: 311 goto match_failure; 312 313 /* 314 * Disgusting backwards compatibility hack. XXX 315 */ 316 case '\0': /* compat */ 317 return (EOF); 318 } 319 320 /* 321 * We have a conversion that requires input. 322 */ 323 if (fp->_r <= 0 && __srefill(fp)) 324 goto input_failure; 325 326 /* 327 * Consume leading white space, except for formats 328 * that suppress this. 329 */ 330 if ((flags & NOSKIP) == 0) { 331 while (isspace(*fp->_p)) { 332 nread++; 333 if (--fp->_r > 0) 334 fp->_p++; 335 else if (__srefill(fp)) 336 goto input_failure; 337 } 338 /* 339 * Note that there is at least one character in 340 * the buffer, so conversions that do not set NOSKIP 341 * ca no longer result in an input failure. 342 */ 343 } 344 345 /* 346 * Do the conversion. 347 */ 348 switch (c) { 349 350 case CT_CHAR: 351 /* scan arbitrary characters (sets NOSKIP) */ 352 if (width == 0) 353 width = 1; 354 if (flags & SUPPRESS) { 355 size_t sum = 0; 356 for (;;) { 357 if ((n = fp->_r) < width) { 358 sum += n; 359 width -= n; 360 fp->_p += n; 361 if (__srefill(fp)) { 362 if (sum == 0) 363 goto input_failure; 364 break; 365 } 366 } else { 367 sum += width; 368 fp->_r -= width; 369 fp->_p += width; 370 break; 371 } 372 } 373 nread += sum; 374 } else { 375 size_t r = fread((void *)va_arg(ap, char *), 1, 376 width, fp); 377 378 if (r == 0) 379 goto input_failure; 380 nread += r; 381 nassigned++; 382 } 383 nconversions++; 384 break; 385 386 case CT_CCL: 387 /* scan a (nonempty) character class (sets NOSKIP) */ 388 if (width == 0) 389 width = (size_t)~0; /* `infinity' */ 390 /* take only those things in the class */ 391 if (flags & SUPPRESS) { 392 n = 0; 393 while (ccltab[*fp->_p]) { 394 n++, fp->_r--, fp->_p++; 395 if (--width == 0) 396 break; 397 if (fp->_r <= 0 && __srefill(fp)) { 398 if (n == 0) 399 goto input_failure; 400 break; 401 } 402 } 403 if (n == 0) 404 goto match_failure; 405 } else { 406 p0 = p = va_arg(ap, char *); 407 while (ccltab[*fp->_p]) { 408 fp->_r--; 409 *p++ = *fp->_p++; 410 if (--width == 0) 411 break; 412 if (fp->_r <= 0 && __srefill(fp)) { 413 if (p == p0) 414 goto input_failure; 415 break; 416 } 417 } 418 n = p - p0; 419 if (n == 0) 420 goto match_failure; 421 *p = 0; 422 nassigned++; 423 } 424 nread += n; 425 nconversions++; 426 break; 427 428 case CT_STRING: 429 /* like CCL, but zero-length string OK, & no NOSKIP */ 430 if (width == 0) 431 width = (size_t)~0; 432 if (flags & SUPPRESS) { 433 n = 0; 434 while (!isspace(*fp->_p)) { 435 n++, fp->_r--, fp->_p++; 436 if (--width == 0) 437 break; 438 if (fp->_r <= 0 && __srefill(fp)) 439 break; 440 } 441 nread += n; 442 } else { 443 p0 = p = va_arg(ap, char *); 444 while (!isspace(*fp->_p)) { 445 fp->_r--; 446 *p++ = *fp->_p++; 447 if (--width == 0) 448 break; 449 if (fp->_r <= 0 && __srefill(fp)) 450 break; 451 } 452 *p = 0; 453 nread += p - p0; 454 nassigned++; 455 } 456 nconversions++; 457 continue; 458 459 case CT_INT: 460 /* scan an integer as if by the conversion function */ 461 #ifdef hardway 462 if (width == 0 || width > sizeof(buf) - 1) 463 width = sizeof(buf) - 1; 464 #else 465 /* size_t is unsigned, hence this optimisation */ 466 if (--width > sizeof(buf) - 2) 467 width = sizeof(buf) - 2; 468 width++; 469 #endif 470 flags |= SIGNOK | NDIGITS | NZDIGITS; 471 for (p = buf; width; width--) { 472 c = *fp->_p; 473 /* 474 * Switch on the character; `goto ok' 475 * if we accept it as a part of number. 476 */ 477 switch (c) { 478 479 /* 480 * The digit 0 is always legal, but is 481 * special. For %i conversions, if no 482 * digits (zero or nonzero) have been 483 * scanned (only signs), we will have 484 * base==0. In that case, we should set 485 * it to 8 and enable 0x prefixing. 486 * Also, if we have not scanned zero digits 487 * before this, do not turn off prefixing 488 * (someone else will turn it off if we 489 * have scanned any nonzero digits). 490 */ 491 case '0': 492 if (base == 0) { 493 base = 8; 494 flags |= PFXOK; 495 } 496 if (flags & NZDIGITS) 497 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 498 else 499 flags &= ~(SIGNOK|PFXOK|NDIGITS); 500 goto ok; 501 502 /* 1 through 7 always legal */ 503 case '1': case '2': case '3': 504 case '4': case '5': case '6': case '7': 505 base = basefix[base]; 506 flags &= ~(SIGNOK | PFXOK | NDIGITS); 507 goto ok; 508 509 /* digits 8 and 9 ok iff decimal or hex */ 510 case '8': case '9': 511 base = basefix[base]; 512 if (base <= 8) 513 break; /* not legal here */ 514 flags &= ~(SIGNOK | PFXOK | NDIGITS); 515 goto ok; 516 517 /* letters ok iff hex */ 518 case 'A': case 'B': case 'C': 519 case 'D': case 'E': case 'F': 520 case 'a': case 'b': case 'c': 521 case 'd': case 'e': case 'f': 522 /* no need to fix base here */ 523 if (base <= 10) 524 break; /* not legal here */ 525 flags &= ~(SIGNOK | PFXOK | NDIGITS); 526 goto ok; 527 528 /* sign ok only as first character */ 529 case '+': case '-': 530 if (flags & SIGNOK) { 531 flags &= ~SIGNOK; 532 goto ok; 533 } 534 break; 535 536 /* x ok iff flag still set & 2nd char */ 537 case 'x': case 'X': 538 if (flags & PFXOK && p == buf + 1) { 539 base = 16; /* if %i */ 540 flags &= ~PFXOK; 541 goto ok; 542 } 543 break; 544 } 545 546 /* 547 * If we got here, c is not a legal character 548 * for a number. Stop accumulating digits. 549 */ 550 break; 551 ok: 552 /* 553 * c is legal: store it and look at the next. 554 */ 555 *p++ = c; 556 if (--fp->_r > 0) 557 fp->_p++; 558 else if (__srefill(fp)) 559 break; /* EOF */ 560 } 561 /* 562 * If we had only a sign, it is no good; push 563 * back the sign. If the number ends in `x', 564 * it was [sign] '0' 'x', so push back the x 565 * and treat it as [sign] '0'. 566 */ 567 if (flags & NDIGITS) { 568 if (p > buf) 569 (void) __ungetc(*(u_char *)--p, fp); 570 goto match_failure; 571 } 572 c = ((u_char *)p)[-1]; 573 if (c == 'x' || c == 'X') { 574 --p; 575 (void) __ungetc(c, fp); 576 } 577 if ((flags & SUPPRESS) == 0) { 578 uintmax_t res; 579 580 *p = 0; 581 if ((flags & UNSIGNED) == 0) 582 res = strtoimax(buf, (char **)NULL, base); 583 else 584 res = strtoumax(buf, (char **)NULL, base); 585 if (flags & POINTER) 586 *va_arg(ap, void **) = 587 (void *)(uintptr_t)res; 588 else if (flags & SHORTSHORT) 589 *va_arg(ap, char *) = res; 590 else if (flags & SHORT) 591 *va_arg(ap, short *) = res; 592 else if (flags & LONG) 593 *va_arg(ap, long *) = res; 594 else if (flags & LONGLONG) 595 *va_arg(ap, long long *) = res; 596 else if (flags & INTMAXT) 597 *va_arg(ap, intmax_t *) = res; 598 else if (flags & PTRDIFFT) 599 *va_arg(ap, ptrdiff_t *) = res; 600 else if (flags & SIZET) 601 *va_arg(ap, size_t *) = res; 602 else 603 *va_arg(ap, int *) = res; 604 nassigned++; 605 } 606 nread += p - buf; 607 nconversions++; 608 break; 609 610 #ifdef FLOATING_POINT 611 case CT_FLOAT: 612 /* scan a floating point number as if by strtod */ 613 #ifdef hardway 614 if (width == 0 || width > sizeof(buf) - 1) 615 width = sizeof(buf) - 1; 616 #else 617 /* size_t is unsigned, hence this optimisation */ 618 if (--width > sizeof(buf) - 2) 619 width = sizeof(buf) - 2; 620 width++; 621 #endif 622 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 623 for (p = buf; width; width--) { 624 c = *fp->_p; 625 /* 626 * This code mimicks the integer conversion 627 * code, but is much simpler. 628 */ 629 switch (c) { 630 631 case '0': case '1': case '2': case '3': 632 case '4': case '5': case '6': case '7': 633 case '8': case '9': 634 flags &= ~(SIGNOK | NDIGITS); 635 goto fok; 636 637 case '+': case '-': 638 if (flags & SIGNOK) { 639 flags &= ~SIGNOK; 640 goto fok; 641 } 642 break; 643 case 'e': case 'E': 644 /* no exponent without some digits */ 645 if ((flags&(NDIGITS|EXPOK)) == EXPOK) { 646 flags = 647 (flags & ~(EXPOK|DPTOK)) | 648 SIGNOK | NDIGITS; 649 goto fok; 650 } 651 break; 652 default: 653 if ((char)c == decimal_point && 654 (flags & DPTOK)) { 655 flags &= ~(SIGNOK | DPTOK); 656 goto fok; 657 } 658 break; 659 } 660 break; 661 fok: 662 *p++ = c; 663 if (--fp->_r > 0) 664 fp->_p++; 665 else if (__srefill(fp)) 666 break; /* EOF */ 667 } 668 /* 669 * If no digits, might be missing exponent digits 670 * (just give back the exponent) or might be missing 671 * regular digits, but had sign and/or decimal point. 672 */ 673 if (flags & NDIGITS) { 674 if (flags & EXPOK) { 675 /* no digits at all */ 676 while (p > buf) 677 __ungetc(*(u_char *)--p, fp); 678 goto match_failure; 679 } 680 /* just a bad exponent (e and maybe sign) */ 681 c = *(u_char *)--p; 682 if (c != 'e' && c != 'E') { 683 (void) __ungetc(c, fp);/* sign */ 684 c = *(u_char *)--p; 685 } 686 (void) __ungetc(c, fp); 687 } 688 if ((flags & SUPPRESS) == 0) { 689 double res; 690 691 *p = 0; 692 /* XXX this loses precision for long doubles. */ 693 res = strtod(buf, (char **) NULL); 694 if (flags & LONGDBL) 695 *va_arg(ap, long double *) = res; 696 else if (flags & LONG) 697 *va_arg(ap, double *) = res; 698 else 699 *va_arg(ap, float *) = res; 700 nassigned++; 701 } 702 nread += p - buf; 703 nconversions++; 704 break; 705 #endif /* FLOATING_POINT */ 706 } 707 } 708 input_failure: 709 return (nconversions != 0 ? nassigned : EOF); 710 match_failure: 711 return (nassigned); 712 } 713 714 /* 715 * Fill in the given table from the scanset at the given format 716 * (just after `['). Return a pointer to the character past the 717 * closing `]'. The table has a 1 wherever characters should be 718 * considered part of the scanset. 719 */ 720 static const u_char * 721 __sccl(tab, fmt) 722 char *tab; 723 const u_char *fmt; 724 { 725 int c, n, v, i; 726 727 /* first `clear' the whole table */ 728 c = *fmt++; /* first char hat => negated scanset */ 729 if (c == '^') { 730 v = 1; /* default => accept */ 731 c = *fmt++; /* get new first char */ 732 } else 733 v = 0; /* default => reject */ 734 735 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ 736 (void) memset(tab, v, 256); 737 738 if (c == 0) 739 return (fmt - 1);/* format ended before closing ] */ 740 741 /* 742 * Now set the entries corresponding to the actual scanset 743 * to the opposite of the above. 744 * 745 * The first character may be ']' (or '-') without being special; 746 * the last character may be '-'. 747 */ 748 v = 1 - v; 749 for (;;) { 750 tab[c] = v; /* take character c */ 751 doswitch: 752 n = *fmt++; /* and examine the next */ 753 switch (n) { 754 755 case 0: /* format ended too soon */ 756 return (fmt - 1); 757 758 case '-': 759 /* 760 * A scanset of the form 761 * [01+-] 762 * is defined as `the digit 0, the digit 1, 763 * the character +, the character -', but 764 * the effect of a scanset such as 765 * [a-zA-Z0-9] 766 * is implementation defined. The V7 Unix 767 * scanf treats `a-z' as `the letters a through 768 * z', but treats `a-a' as `the letter a, the 769 * character -, and the letter a'. 770 * 771 * For compatibility, the `-' is not considerd 772 * to define a range if the character following 773 * it is either a close bracket (required by ANSI) 774 * or is not numerically greater than the character 775 * we just stored in the table (c). 776 */ 777 n = *fmt; 778 if (n == ']' 779 || (__collate_load_error ? n < c : 780 __collate_range_cmp (n, c) < 0 781 ) 782 ) { 783 c = '-'; 784 break; /* resume the for(;;) */ 785 } 786 fmt++; 787 /* fill in the range */ 788 if (__collate_load_error) { 789 do { 790 tab[++c] = v; 791 } while (c < n); 792 } else { 793 for (i = 0; i < 256; i ++) 794 if ( __collate_range_cmp (c, i) < 0 795 && __collate_range_cmp (i, n) <= 0 796 ) 797 tab[i] = v; 798 } 799 #if 1 /* XXX another disgusting compatibility hack */ 800 c = n; 801 /* 802 * Alas, the V7 Unix scanf also treats formats 803 * such as [a-c-e] as `the letters a through e'. 804 * This too is permitted by the standard.... 805 */ 806 goto doswitch; 807 #else 808 c = *fmt++; 809 if (c == 0) 810 return (fmt - 1); 811 if (c == ']') 812 return (fmt); 813 #endif 814 break; 815 816 case ']': /* end of scanset */ 817 return (fmt); 818 819 default: /* just another character */ 820 c = n; 821 break; 822 } 823 } 824 /* NOTREACHED */ 825 } 826