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 * @(#)vfscanf.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: /repoman/r/ncvs/src/lib/libc/stdio/vfscanf.c,v 1.35 2004/01/31 23:16:09 das Exp $ 38 * $DragonFly: src/lib/libc/stdio/vfscanf.c,v 1.10 2005/12/20 00:21:53 davidxu Exp $ 39 */ 40 41 #include "namespace.h" 42 #include <sys/types.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <ctype.h> 46 #include <stdarg.h> 47 #include <string.h> 48 #include "un-namespace.h" 49 50 #include "collate.h" 51 #include "libc_private.h" 52 #include "local.h" 53 #include "priv_stdio.h" 54 55 #define FLOATING_POINT 56 57 #ifdef FLOATING_POINT 58 #include <locale.h> 59 #include "floatio.h" 60 #endif 61 62 #define BUF 513 /* Maximum length of numeric string. */ 63 64 /* 65 * Flags used during conversion. 66 */ 67 #define LONG 0x01 /* l: long or double */ 68 #define LONGDBL 0x02 /* L: long double */ 69 #define SHORT 0x04 /* h: short */ 70 #define SUPPRESS 0x08 /* suppress assignment */ 71 #define POINTER 0x10 /* weird %p pointer (`fake hex') */ 72 #define NOSKIP 0x20 /* do not skip blanks */ 73 #define QUAD 0x400 74 75 /* 76 * The following are used in numeric conversions only: 77 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 78 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 79 */ 80 #define SIGNOK 0x40 /* +/- is (still) legal */ 81 #define NDIGITS 0x80 /* no digits detected */ 82 83 #define DPTOK 0x100 /* (float) decimal point is still legal */ 84 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ 85 86 #define PFXOK 0x100 /* 0x prefix is (still) legal */ 87 #define NZDIGITS 0x200 /* no zero digits detected */ 88 #define HAVESIGN 0x10000 /* sign detected */ 89 90 /* 91 * Conversion types. 92 */ 93 #define CT_CHAR 0 /* %c conversion */ 94 #define CT_CCL 1 /* %[...] conversion */ 95 #define CT_STRING 2 /* %s conversion */ 96 #define CT_INT 3 /* integer, i.e., strtoq or strtouq */ 97 #define CT_FLOAT 4 /* floating, i.e., strtod */ 98 99 #define u_char unsigned char 100 #define u_long unsigned long 101 102 static u_char *__sccl(char *, u_char *); 103 104 /* 105 * __vfscanf MT-safe version 106 */ 107 int 108 __vfscanf(FILE *fp, char const *fmt0, va_list ap) 109 { 110 int ret; 111 112 FLOCKFILE(fp); 113 ret = __svfscanf(fp, fmt0, ap); 114 FUNLOCKFILE(fp); 115 return (ret); 116 } 117 118 /* 119 * __svfscanf - non-MT-safe version of __vfscanf 120 */ 121 int 122 __svfscanf(FILE *fp, char const *fmt0, va_list ap) 123 { 124 u_char *fmt = (u_char *)fmt0; 125 int c; /* character from format, or conversion */ 126 size_t width; /* field width, or 0 */ 127 char *p; /* points into all kinds of strings */ 128 int n; /* handy integer */ 129 int flags; /* flags as defined above */ 130 char *p0; /* saves original value of p when necessary */ 131 int nassigned; /* number of fields assigned */ 132 int nconversions; /* number of conversions */ 133 int nread; /* number of characters consumed from fp */ 134 int base; /* base argument to strtoq/strtouq */ 135 u_quad_t(*ccfn)(); /* conversion function (strtoq/strtouq) */ 136 char ccltab[256]; /* character class table for %[...] */ 137 char buf[BUF]; /* buffer for numeric conversions */ 138 139 /* `basefix' is used to avoid `if' tests in the integer scanner */ 140 static short basefix[17] = 141 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 142 #ifdef FLOATING_POINT 143 char decimal_point = localeconv()->decimal_point[0]; 144 #endif 145 146 nassigned = 0; 147 nconversions = 0; 148 nread = 0; 149 base = 0; /* XXX just to keep gcc happy */ 150 ccfn = NULL; /* XXX just to keep gcc happy */ 151 for (;;) { 152 c = *fmt++; 153 if (c == 0) 154 return (nassigned); 155 if (isspace(c)) { 156 while ((fp->pub._r > 0 || __srefill(fp) == 0) && isspace(*fp->pub._p)) 157 nread++, fp->pub._r--, fp->pub._p++; 158 continue; 159 } 160 if (c != '%') 161 goto literal; 162 width = 0; 163 flags = 0; 164 /* 165 * switch on the format. continue if done; 166 * break once format type is derived. 167 */ 168 again: c = *fmt++; 169 switch (c) { 170 case '%': 171 literal: 172 if (fp->pub._r <= 0 && __srefill(fp)) 173 goto input_failure; 174 if (*fp->pub._p != c) 175 goto match_failure; 176 fp->pub._r--, fp->pub._p++; 177 nread++; 178 continue; 179 180 case '*': 181 flags |= SUPPRESS; 182 goto again; 183 case 'l': 184 flags |= LONG; 185 goto again; 186 case 'q': 187 flags |= QUAD; 188 goto again; 189 case 'L': 190 flags |= LONGDBL; 191 goto again; 192 case 'h': 193 flags |= SHORT; 194 goto again; 195 196 case '0': case '1': case '2': case '3': case '4': 197 case '5': case '6': case '7': case '8': case '9': 198 width = width * 10 + c - '0'; 199 goto again; 200 201 /* 202 * Conversions. 203 * Those marked `compat' are for 4.[123]BSD compatibility. 204 * 205 * (According to ANSI, E and X formats are supposed 206 * to the same as e and x. Sorry about that.) 207 */ 208 case 'D': /* compat */ 209 flags |= LONG; 210 /* FALLTHROUGH */ 211 case 'd': 212 c = CT_INT; 213 ccfn = (u_quad_t (*)())strtoq; 214 base = 10; 215 break; 216 217 case 'i': 218 c = CT_INT; 219 ccfn = (u_quad_t (*)())strtoq; 220 base = 0; 221 break; 222 223 case 'O': /* compat */ 224 flags |= LONG; 225 /* FALLTHROUGH */ 226 case 'o': 227 c = CT_INT; 228 ccfn = strtouq; 229 base = 8; 230 break; 231 232 case 'u': 233 c = CT_INT; 234 ccfn = strtouq; 235 base = 10; 236 break; 237 238 case 'X': /* compat XXX */ 239 flags |= LONG; 240 /* FALLTHROUGH */ 241 case 'x': 242 flags |= PFXOK; /* enable 0x prefixing */ 243 c = CT_INT; 244 ccfn = strtouq; 245 base = 16; 246 break; 247 248 #ifdef FLOATING_POINT 249 case 'E': /* compat XXX */ 250 case 'F': /* compat */ 251 flags |= LONG; 252 /* FALLTHROUGH */ 253 case 'e': case 'f': case 'g': 254 c = CT_FLOAT; 255 break; 256 #endif 257 258 case 's': 259 c = CT_STRING; 260 break; 261 262 case '[': 263 fmt = __sccl(ccltab, fmt); 264 flags |= NOSKIP; 265 c = CT_CCL; 266 break; 267 268 case 'c': 269 flags |= NOSKIP; 270 c = CT_CHAR; 271 break; 272 273 case 'p': /* pointer format is like hex */ 274 flags |= POINTER | PFXOK; 275 c = CT_INT; 276 ccfn = strtouq; 277 base = 16; 278 break; 279 280 case 'n': 281 nconversions++; 282 if (flags & SUPPRESS) /* ??? */ 283 continue; 284 if (flags & SHORT) 285 *va_arg(ap, short *) = nread; 286 else if (flags & LONG) 287 *va_arg(ap, long *) = nread; 288 else if (flags & QUAD) 289 *va_arg(ap, quad_t *) = nread; 290 else 291 *va_arg(ap, int *) = nread; 292 continue; 293 294 /* 295 * Disgusting backwards compatibility hacks. XXX 296 */ 297 case '\0': /* compat */ 298 return (EOF); 299 300 default: /* compat */ 301 if (isupper(c)) 302 flags |= LONG; 303 c = CT_INT; 304 ccfn = (u_quad_t (*)())strtoq; 305 base = 10; 306 break; 307 } 308 309 /* 310 * We have a conversion that requires input. 311 */ 312 if (fp->pub._r <= 0 && __srefill(fp)) 313 goto input_failure; 314 315 /* 316 * Consume leading white space, except for formats 317 * that suppress this. 318 */ 319 if ((flags & NOSKIP) == 0) { 320 while (isspace(*fp->pub._p)) { 321 nread++; 322 if (--fp->pub._r > 0) 323 fp->pub._p++; 324 else if (__srefill(fp)) 325 goto input_failure; 326 } 327 /* 328 * Note that there is at least one character in 329 * the buffer, so conversions that do not set NOSKIP 330 * ca no longer result in an input failure. 331 */ 332 } 333 334 /* 335 * Do the conversion. 336 */ 337 switch (c) { 338 339 case CT_CHAR: 340 /* scan arbitrary characters (sets NOSKIP) */ 341 if (width == 0) 342 width = 1; 343 if (flags & SUPPRESS) { 344 size_t sum = 0; 345 for (;;) { 346 if ((n = fp->pub._r) < width) { 347 sum += n; 348 width -= n; 349 fp->pub._p += n; 350 if (__srefill(fp)) { 351 if (sum == 0) 352 goto input_failure; 353 break; 354 } 355 } else { 356 sum += width; 357 fp->pub._r -= width; 358 fp->pub._p += width; 359 break; 360 } 361 } 362 nread += sum; 363 } else { 364 size_t r = __fread((void *)va_arg(ap, char *), 365 1, width, fp); 366 367 if (r == 0) 368 goto input_failure; 369 nread += r; 370 nassigned++; 371 } 372 nconversions++; 373 break; 374 375 case CT_CCL: 376 /* scan a (nonempty) character class (sets NOSKIP) */ 377 if (width == 0) 378 width = (size_t)~0; /* `infinity' */ 379 /* take only those things in the class */ 380 if (flags & SUPPRESS) { 381 n = 0; 382 while (ccltab[*fp->pub._p]) { 383 n++, fp->pub._r--, fp->pub._p++; 384 if (--width == 0) 385 break; 386 if (fp->pub._r <= 0 && __srefill(fp)) { 387 if (n == 0) 388 goto input_failure; 389 break; 390 } 391 } 392 if (n == 0) 393 goto match_failure; 394 } else { 395 p0 = p = va_arg(ap, char *); 396 while (ccltab[*fp->pub._p]) { 397 fp->pub._r--; 398 *p++ = *fp->pub._p++; 399 if (--width == 0) 400 break; 401 if (fp->pub._r <= 0 && __srefill(fp)) { 402 if (p == p0) 403 goto input_failure; 404 break; 405 } 406 } 407 n = p - p0; 408 if (n == 0) 409 goto match_failure; 410 *p = 0; 411 nassigned++; 412 } 413 nread += n; 414 nconversions++; 415 break; 416 417 case CT_STRING: 418 /* like CCL, but zero-length string OK, & no NOSKIP */ 419 if (width == 0) 420 width = (size_t)~0; 421 if (flags & SUPPRESS) { 422 n = 0; 423 while (!isspace(*fp->pub._p)) { 424 n++, fp->pub._r--, fp->pub._p++; 425 if (--width == 0) 426 break; 427 if (fp->pub._r <= 0 && __srefill(fp)) 428 break; 429 } 430 nread += n; 431 } else { 432 p0 = p = va_arg(ap, char *); 433 while (!isspace(*fp->pub._p)) { 434 fp->pub._r--; 435 *p++ = *fp->pub._p++; 436 if (--width == 0) 437 break; 438 if (fp->pub._r <= 0 && __srefill(fp)) 439 break; 440 } 441 *p = 0; 442 nread += p - p0; 443 nassigned++; 444 } 445 nconversions++; 446 continue; 447 448 case CT_INT: 449 /* scan an integer as if by strtoq/strtouq */ 450 #ifdef hardway 451 if (width == 0 || width > sizeof(buf) - 1) 452 width = sizeof(buf) - 1; 453 #else 454 /* size_t is unsigned, hence this optimisation */ 455 if (--width > sizeof(buf) - 2) 456 width = sizeof(buf) - 2; 457 width++; 458 #endif 459 flags |= SIGNOK | NDIGITS | NZDIGITS; 460 for (p = buf; width; width--) { 461 c = *fp->pub._p; 462 /* 463 * Switch on the character; `goto ok' 464 * if we accept it as a part of number. 465 */ 466 switch (c) { 467 468 /* 469 * The digit 0 is always legal, but is 470 * special. For %i conversions, if no 471 * digits (zero or nonzero) have been 472 * scanned (only signs), we will have 473 * base==0. In that case, we should set 474 * it to 8 and enable 0x prefixing. 475 * Also, if we have not scanned zero digits 476 * before this, do not turn off prefixing 477 * (someone else will turn it off if we 478 * have scanned any nonzero digits). 479 */ 480 case '0': 481 if (base == 0) { 482 base = 8; 483 flags |= PFXOK; 484 } 485 if (flags & NZDIGITS) 486 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 487 else 488 flags &= ~(SIGNOK|PFXOK|NDIGITS); 489 goto ok; 490 491 /* 1 through 7 always legal */ 492 case '1': case '2': case '3': 493 case '4': case '5': case '6': case '7': 494 base = basefix[base]; 495 flags &= ~(SIGNOK | PFXOK | NDIGITS); 496 goto ok; 497 498 /* digits 8 and 9 ok iff decimal or hex */ 499 case '8': case '9': 500 base = basefix[base]; 501 if (base <= 8) 502 break; /* not legal here */ 503 flags &= ~(SIGNOK | PFXOK | NDIGITS); 504 goto ok; 505 506 /* letters ok iff hex */ 507 case 'A': case 'B': case 'C': 508 case 'D': case 'E': case 'F': 509 case 'a': case 'b': case 'c': 510 case 'd': case 'e': case 'f': 511 /* no need to fix base here */ 512 if (base <= 10) 513 break; /* not legal here */ 514 flags &= ~(SIGNOK | PFXOK | NDIGITS); 515 goto ok; 516 517 /* sign ok only as first character */ 518 case '+': case '-': 519 if (flags & SIGNOK) { 520 flags &= ~SIGNOK; 521 flags |= HAVESIGN; 522 goto ok; 523 } 524 break; 525 526 /* 527 * x ok iff flag still set & 2nd char (or 528 * 3rd char if we have a sign). 529 */ 530 case 'x': case 'X': 531 if (flags & PFXOK && p == 532 buf + 1 + !!(flags & HAVESIGN)) { 533 base = 16; /* if %i */ 534 flags &= ~PFXOK; 535 goto ok; 536 } 537 break; 538 } 539 540 /* 541 * If we got here, c is not a legal character 542 * for a number. Stop accumulating digits. 543 */ 544 break; 545 ok: 546 /* 547 * c is legal: store it and look at the next. 548 */ 549 *p++ = c; 550 if (--fp->pub._r > 0) 551 fp->pub._p++; 552 else if (__srefill(fp)) 553 break; /* EOF */ 554 } 555 /* 556 * If we had only a sign, it is no good; push 557 * back the sign. If the number ends in `x', 558 * it was [sign] '0' 'x', so push back the x 559 * and treat it as [sign] '0'. 560 */ 561 if (flags & NDIGITS) { 562 if (p > buf) 563 __ungetc(*(u_char *)--p, fp); 564 goto match_failure; 565 } 566 c = ((u_char *)p)[-1]; 567 if (c == 'x' || c == 'X') { 568 --p; 569 __ungetc(c, fp); 570 } 571 if ((flags & SUPPRESS) == 0) { 572 u_quad_t res; 573 574 *p = 0; 575 res = (*ccfn)(buf, (char **)NULL, base); 576 if (flags & POINTER) 577 *va_arg(ap, void **) = 578 (void *)(u_long)res; 579 else if (flags & SHORT) 580 *va_arg(ap, short *) = res; 581 else if (flags & LONG) 582 *va_arg(ap, long *) = res; 583 else if (flags & QUAD) 584 *va_arg(ap, quad_t *) = res; 585 else 586 *va_arg(ap, int *) = res; 587 nassigned++; 588 } 589 nread += p - buf; 590 nconversions++; 591 break; 592 593 #ifdef FLOATING_POINT 594 case CT_FLOAT: 595 /* scan a floating point number as if by strtod */ 596 #ifdef hardway 597 if (width == 0 || width > sizeof(buf) - 1) 598 width = sizeof(buf) - 1; 599 #else 600 /* size_t is unsigned, hence this optimisation */ 601 if (--width > sizeof(buf) - 2) 602 width = sizeof(buf) - 2; 603 width++; 604 #endif 605 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 606 for (p = buf; width; width--) { 607 c = *fp->pub._p; 608 /* 609 * This code mimicks the integer conversion 610 * code, but is much simpler. 611 */ 612 switch (c) { 613 614 case '0': case '1': case '2': case '3': 615 case '4': case '5': case '6': case '7': 616 case '8': case '9': 617 flags &= ~(SIGNOK | NDIGITS); 618 goto fok; 619 620 case '+': case '-': 621 if (flags & SIGNOK) { 622 flags &= ~SIGNOK; 623 goto fok; 624 } 625 break; 626 case 'e': case 'E': 627 /* no exponent without some digits */ 628 if ((flags&(NDIGITS|EXPOK)) == EXPOK) { 629 flags = 630 (flags & ~(EXPOK|DPTOK)) | 631 SIGNOK | NDIGITS; 632 goto fok; 633 } 634 break; 635 default: 636 if ((char)c == decimal_point && 637 (flags & DPTOK)) { 638 flags &= ~(SIGNOK | DPTOK); 639 goto fok; 640 } 641 break; 642 } 643 break; 644 fok: 645 *p++ = c; 646 if (--fp->pub._r > 0) 647 fp->pub._p++; 648 else if (__srefill(fp)) 649 break; /* EOF */ 650 } 651 /* 652 * If no digits, might be missing exponent digits 653 * (just give back the exponent) or might be missing 654 * regular digits, but had sign and/or decimal point. 655 */ 656 if (flags & NDIGITS) { 657 if (flags & EXPOK) { 658 /* no digits at all */ 659 while (p > buf) 660 __ungetc(*(u_char *)--p, fp); 661 goto match_failure; 662 } 663 /* just a bad exponent (e and maybe sign) */ 664 c = *(u_char *)--p; 665 if (c != 'e' && c != 'E') { 666 __ungetc(c, fp);/* sign */ 667 c = *(u_char *)--p; 668 } 669 __ungetc(c, fp); 670 } 671 if ((flags & SUPPRESS) == 0) { 672 double res; 673 674 *p = 0; 675 /* XXX this loses precision for long doubles. */ 676 res = strtod(buf, (char **) NULL); 677 if (flags & LONGDBL) 678 *va_arg(ap, long double *) = res; 679 else if (flags & LONG) 680 *va_arg(ap, double *) = res; 681 else 682 *va_arg(ap, float *) = res; 683 nassigned++; 684 } 685 nread += p - buf; 686 nconversions++; 687 break; 688 #endif /* FLOATING_POINT */ 689 } 690 } 691 input_failure: 692 return (nconversions != 0 ? nassigned : EOF); 693 match_failure: 694 return (nassigned); 695 } 696 697 /* 698 * Fill in the given table from the scanset at the given format 699 * (just after `['). Return a pointer to the character past the 700 * closing `]'. The table has a 1 wherever characters should be 701 * considered part of the scanset. 702 */ 703 static u_char * 704 __sccl(char *tab, u_char *fmt) 705 { 706 int c, n, v, i; 707 708 /* first `clear' the whole table */ 709 c = *fmt++; /* first char hat => negated scanset */ 710 if (c == '^') { 711 v = 1; /* default => accept */ 712 c = *fmt++; /* get new first char */ 713 } else 714 v = 0; /* default => reject */ 715 716 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ 717 memset(tab, v, 256); 718 719 if (c == 0) 720 return (fmt - 1);/* format ended before closing ] */ 721 722 /* 723 * Now set the entries corresponding to the actual scanset 724 * to the opposite of the above. 725 * 726 * The first character may be ']' (or '-') without being special; 727 * the last character may be '-'. 728 */ 729 v = 1 - v; 730 for (;;) { 731 tab[c] = v; /* take character c */ 732 doswitch: 733 n = *fmt++; /* and examine the next */ 734 switch (n) { 735 736 case 0: /* format ended too soon */ 737 return (fmt - 1); 738 739 case '-': 740 /* 741 * A scanset of the form 742 * [01+-] 743 * is defined as `the digit 0, the digit 1, 744 * the character +, the character -', but 745 * the effect of a scanset such as 746 * [a-zA-Z0-9] 747 * is implementation defined. The V7 Unix 748 * scanf treats `a-z' as `the letters a through 749 * z', but treats `a-a' as `the letter a, the 750 * character -, and the letter a'. 751 * 752 * For compatibility, the `-' is not considerd 753 * to define a range if the character following 754 * it is either a close bracket (required by ANSI) 755 * or is not numerically greater than the character 756 * we just stored in the table (c). 757 */ 758 n = *fmt; 759 if (n == ']' 760 || (__collate_load_error ? n < c : 761 __collate_range_cmp (n, c) < 0 762 ) 763 ) { 764 c = '-'; 765 break; /* resume the for(;;) */ 766 } 767 fmt++; 768 /* fill in the range */ 769 if (__collate_load_error) { 770 do { 771 tab[++c] = v; 772 } while (c < n); 773 } else { 774 for (i = 0; i < 256; i ++) 775 if ( __collate_range_cmp (c, i) < 0 776 && __collate_range_cmp (i, n) <= 0 777 ) 778 tab[i] = v; 779 } 780 #if 1 /* XXX another disgusting compatibility hack */ 781 c = n; 782 /* 783 * Alas, the V7 Unix scanf also treats formats 784 * such as [a-c-e] as `the letters a through e'. 785 * This too is permitted by the standard.... 786 */ 787 goto doswitch; 788 #else 789 c = *fmt++; 790 if (c == 0) 791 return (fmt - 1); 792 if (c == ']') 793 return (fmt); 794 #endif 795 break; 796 797 case ']': /* end of scanset */ 798 return (fmt); 799 800 default: /* just another character */ 801 c = n; 802 break; 803 } 804 } 805 /* NOTREACHED */ 806 } 807