1 /* 2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * By using this file, you agree to the terms and conditions set 11 * forth in the LICENSE file which can be found at the top level of 12 * the sendmail distribution. 13 */ 14 15 #include <sm/gen.h> 16 SM_IDSTR(id, "@(#)$Id: vfscanf.c,v 1.1.1.1 2002/02/17 21:56:43 gshapiro Exp $") 17 18 #include <ctype.h> 19 #include <stdlib.h> 20 #include <errno.h> 21 #include <setjmp.h> 22 #include <sys/time.h> 23 #include <sm/varargs.h> 24 #include <sm/config.h> 25 #include <sm/io.h> 26 #include <sm/signal.h> 27 #include <sm/clock.h> 28 #include <sm/string.h> 29 #include "local.h" 30 31 #define BUF 513 /* Maximum length of numeric string. */ 32 33 /* Flags used during conversion. */ 34 #define LONG 0x01 /* l: long or double */ 35 #define SHORT 0x04 /* h: short */ 36 #define QUAD 0x08 /* q: quad (same as ll) */ 37 #define SUPPRESS 0x10 /* suppress assignment */ 38 #define POINTER 0x20 /* weird %p pointer (`fake hex') */ 39 #define NOSKIP 0x40 /* do not skip blanks */ 40 41 /* 42 ** The following are used in numeric conversions only: 43 ** SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; 44 ** SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. 45 */ 46 47 #define SIGNOK 0x080 /* +/- is (still) legal */ 48 #define NDIGITS 0x100 /* no digits detected */ 49 50 #define DPTOK 0x200 /* (float) decimal point is still legal */ 51 #define EXPOK 0x400 /* (float) exponent (e+3, etc) still legal */ 52 53 #define PFXOK 0x200 /* 0x prefix is (still) legal */ 54 #define NZDIGITS 0x400 /* no zero digits detected */ 55 56 /* Conversion types. */ 57 #define CT_CHAR 0 /* %c conversion */ 58 #define CT_CCL 1 /* %[...] conversion */ 59 #define CT_STRING 2 /* %s conversion */ 60 #define CT_INT 3 /* integer, i.e., strtoll or strtoull */ 61 #define CT_FLOAT 4 /* floating, i.e., strtod */ 62 63 static unsigned char *sm_sccl __P((char *, unsigned char *)); 64 static jmp_buf ScanTimeOut; 65 66 /* 67 ** SCANALRM -- handler when timeout activated for sm_io_vfscanf() 68 ** 69 ** Returns flow of control to where setjmp(ScanTimeOut) was set. 70 ** 71 ** Parameters: 72 ** sig -- unused 73 ** 74 ** Returns: 75 ** does not return 76 ** 77 ** Side Effects: 78 ** returns flow of control to setjmp(ScanTimeOut). 79 ** 80 ** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD 81 ** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE 82 ** DOING. 83 */ 84 85 /* ARGSUSED0 */ 86 static void 87 scanalrm(sig) 88 int sig; 89 { 90 longjmp(ScanTimeOut, 1); 91 } 92 93 /* 94 ** SM_VFSCANF -- convert input into data units 95 ** 96 ** Parameters: 97 ** fp -- file pointer for input data 98 ** timeout -- time intvl allowed to complete (milliseconds) 99 ** fmt0 -- format for finding data units 100 ** ap -- vectors for memory location for storing data units 101 ** 102 ** Results: 103 ** Success: number of data units assigned 104 ** Failure: SM_IO_EOF 105 */ 106 107 int 108 sm_vfscanf(fp, timeout, fmt0, ap) 109 register SM_FILE_T *fp; 110 int SM_NONVOLATILE timeout; 111 char const *fmt0; 112 va_list SM_NONVOLATILE ap; 113 { 114 register unsigned char *SM_NONVOLATILE fmt = (unsigned char *) fmt0; 115 register int c; /* character from format, or conversion */ 116 register size_t width; /* field width, or 0 */ 117 register char *p; /* points into all kinds of strings */ 118 register int n; /* handy integer */ 119 register int flags; /* flags as defined above */ 120 register char *p0; /* saves original value of p when necessary */ 121 int nassigned; /* number of fields assigned */ 122 int nread; /* number of characters consumed from fp */ 123 int base; /* base argument to strtoll/strtoull */ 124 ULONGLONG_T (*ccfn)(); /* conversion function (strtoll/strtoull) */ 125 char ccltab[256]; /* character class table for %[...] */ 126 char buf[BUF]; /* buffer for numeric conversions */ 127 SM_EVENT *evt = NULL; 128 129 /* `basefix' is used to avoid `if' tests in the integer scanner */ 130 static short basefix[17] = 131 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 132 133 if (timeout == SM_TIME_DEFAULT) 134 timeout = fp->f_timeout; 135 if (timeout == SM_TIME_IMMEDIATE) 136 { 137 /* 138 ** Filling the buffer will take time and we are wanted to 139 ** return immediately. So... 140 */ 141 142 errno = EAGAIN; 143 return SM_IO_EOF; 144 } 145 146 if (timeout != SM_TIME_FOREVER) 147 { 148 if (setjmp(ScanTimeOut) != 0) 149 { 150 errno = EAGAIN; 151 return SM_IO_EOF; 152 } 153 154 evt = sm_seteventm(timeout, scanalrm, 0); 155 } 156 157 nassigned = 0; 158 nread = 0; 159 base = 0; /* XXX just to keep gcc happy */ 160 ccfn = NULL; /* XXX just to keep gcc happy */ 161 for (;;) 162 { 163 c = *fmt++; 164 if (c == 0) 165 { 166 if (evt != NULL) 167 sm_clrevent(evt); /* undo our timeout */ 168 return nassigned; 169 } 170 if (isspace(c)) 171 { 172 while ((fp->f_r > 0 || sm_refill(fp, SM_TIME_FOREVER) 173 == 0) && 174 isspace(*fp->f_p)) 175 nread++, fp->f_r--, fp->f_p++; 176 continue; 177 } 178 if (c != '%') 179 goto literal; 180 width = 0; 181 flags = 0; 182 183 /* 184 ** switch on the format. continue if done; 185 ** break once format type is derived. 186 */ 187 188 again: c = *fmt++; 189 switch (c) 190 { 191 case '%': 192 literal: 193 if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER)) 194 goto input_failure; 195 if (*fp->f_p != c) 196 goto match_failure; 197 fp->f_r--, fp->f_p++; 198 nread++; 199 continue; 200 201 case '*': 202 flags |= SUPPRESS; 203 goto again; 204 case 'h': 205 flags |= SHORT; 206 goto again; 207 case 'l': 208 if (*fmt == 'l') 209 { 210 fmt++; 211 flags |= QUAD; 212 } 213 else 214 { 215 flags |= LONG; 216 } 217 goto again; 218 case 'q': 219 flags |= QUAD; 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 ** Those marked `compat' are for 4.[123]BSD compatibility. 230 ** 231 ** (According to ANSI, E and X formats are supposed 232 ** to the same as e and x. Sorry about that.) 233 */ 234 235 case 'D': /* compat */ 236 flags |= LONG; 237 /* FALLTHROUGH */ 238 case 'd': 239 c = CT_INT; 240 ccfn = (ULONGLONG_T (*)())sm_strtoll; 241 base = 10; 242 break; 243 244 case 'i': 245 c = CT_INT; 246 ccfn = (ULONGLONG_T (*)())sm_strtoll; 247 base = 0; 248 break; 249 250 case 'O': /* compat */ 251 flags |= LONG; 252 /* FALLTHROUGH */ 253 case 'o': 254 c = CT_INT; 255 ccfn = sm_strtoull; 256 base = 8; 257 break; 258 259 case 'u': 260 c = CT_INT; 261 ccfn = sm_strtoull; 262 base = 10; 263 break; 264 265 case 'X': 266 case 'x': 267 flags |= PFXOK; /* enable 0x prefixing */ 268 c = CT_INT; 269 ccfn = sm_strtoull; 270 base = 16; 271 break; 272 273 case 'E': 274 case 'G': 275 case 'e': 276 case 'f': 277 case 'g': 278 c = CT_FLOAT; 279 break; 280 281 case 's': 282 c = CT_STRING; 283 break; 284 285 case '[': 286 fmt = sm_sccl(ccltab, fmt); 287 flags |= NOSKIP; 288 c = CT_CCL; 289 break; 290 291 case 'c': 292 flags |= NOSKIP; 293 c = CT_CHAR; 294 break; 295 296 case 'p': /* pointer format is like hex */ 297 flags |= POINTER | PFXOK; 298 c = CT_INT; 299 ccfn = sm_strtoull; 300 base = 16; 301 break; 302 303 case 'n': 304 if (flags & SUPPRESS) /* ??? */ 305 continue; 306 if (flags & SHORT) 307 *SM_VA_ARG(ap, short *) = nread; 308 else if (flags & LONG) 309 *SM_VA_ARG(ap, long *) = nread; 310 else 311 *SM_VA_ARG(ap, int *) = nread; 312 continue; 313 314 /* Disgusting backwards compatibility hacks. XXX */ 315 case '\0': /* compat */ 316 if (evt != NULL) 317 sm_clrevent(evt); /* undo our timeout */ 318 return SM_IO_EOF; 319 320 default: /* compat */ 321 if (isupper(c)) 322 flags |= LONG; 323 c = CT_INT; 324 ccfn = (ULONGLONG_T (*)()) sm_strtoll; 325 base = 10; 326 break; 327 } 328 329 /* We have a conversion that requires input. */ 330 if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER)) 331 goto input_failure; 332 333 /* 334 ** Consume leading white space, except for formats 335 ** that suppress this. 336 */ 337 338 if ((flags & NOSKIP) == 0) 339 { 340 while (isspace(*fp->f_p)) 341 { 342 nread++; 343 if (--fp->f_r > 0) 344 fp->f_p++; 345 else if (sm_refill(fp, SM_TIME_FOREVER)) 346 goto input_failure; 347 } 348 /* 349 ** Note that there is at least one character in 350 ** the buffer, so conversions that do not set NOSKIP 351 ** can no longer result in an input failure. 352 */ 353 } 354 355 /* Do the conversion. */ 356 switch (c) 357 { 358 case CT_CHAR: 359 /* scan arbitrary characters (sets NOSKIP) */ 360 if (width == 0) 361 width = 1; 362 if (flags & SUPPRESS) 363 { 364 size_t sum = 0; 365 for (;;) 366 { 367 if ((size_t) (n = fp->f_r) < width) 368 { 369 sum += n; 370 width -= n; 371 fp->f_p += n; 372 if (sm_refill(fp, 373 SM_TIME_FOREVER)) 374 { 375 if (sum == 0) 376 goto input_failure; 377 break; 378 } 379 } 380 else 381 { 382 sum += width; 383 fp->f_r -= width; 384 fp->f_p += width; 385 break; 386 } 387 } 388 nread += sum; 389 } 390 else 391 { 392 size_t r; 393 394 r = sm_io_read(fp, SM_TIME_FOREVER, 395 (void *) SM_VA_ARG(ap, char *), 396 width); 397 if (r == 0) 398 goto input_failure; 399 nread += r; 400 nassigned++; 401 } 402 break; 403 404 case CT_CCL: 405 /* scan a (nonempty) character class (sets NOSKIP) */ 406 if (width == 0) 407 width = (size_t)~0; /* `infinity' */ 408 409 /* take only those things in the class */ 410 if (flags & SUPPRESS) 411 { 412 n = 0; 413 while (ccltab[*fp->f_p] != '\0') 414 { 415 n++, fp->f_r--, fp->f_p++; 416 if (--width == 0) 417 break; 418 if (fp->f_r <= 0 && 419 sm_refill(fp, SM_TIME_FOREVER)) 420 { 421 if (n == 0) /* XXX how? */ 422 goto input_failure; 423 break; 424 } 425 } 426 if (n == 0) 427 goto match_failure; 428 } 429 else 430 { 431 p0 = p = SM_VA_ARG(ap, char *); 432 while (ccltab[*fp->f_p] != '\0') 433 { 434 fp->f_r--; 435 *p++ = *fp->f_p++; 436 if (--width == 0) 437 break; 438 if (fp->f_r <= 0 && 439 sm_refill(fp, SM_TIME_FOREVER)) 440 { 441 if (p == p0) 442 goto input_failure; 443 break; 444 } 445 } 446 n = p - p0; 447 if (n == 0) 448 goto match_failure; 449 *p = 0; 450 nassigned++; 451 } 452 nread += n; 453 break; 454 455 case CT_STRING: 456 /* like CCL, but zero-length string OK, & no NOSKIP */ 457 if (width == 0) 458 width = (size_t)~0; 459 if (flags & SUPPRESS) 460 { 461 n = 0; 462 while (!isspace(*fp->f_p)) 463 { 464 n++, fp->f_r--, fp->f_p++; 465 if (--width == 0) 466 break; 467 if (fp->f_r <= 0 && 468 sm_refill(fp, SM_TIME_FOREVER)) 469 break; 470 } 471 nread += n; 472 } 473 else 474 { 475 p0 = p = SM_VA_ARG(ap, char *); 476 while (!isspace(*fp->f_p)) 477 { 478 fp->f_r--; 479 *p++ = *fp->f_p++; 480 if (--width == 0) 481 break; 482 if (fp->f_r <= 0 && 483 sm_refill(fp, SM_TIME_FOREVER)) 484 break; 485 } 486 *p = 0; 487 nread += p - p0; 488 nassigned++; 489 } 490 continue; 491 492 case CT_INT: 493 /* scan an integer as if by strtoll/strtoull */ 494 #if SM_CONF_BROKEN_SIZE_T 495 if (width == 0 || width > sizeof(buf) - 1) 496 width = sizeof(buf) - 1; 497 #else /* SM_CONF_BROKEN_SIZE_T */ 498 /* size_t is unsigned, hence this optimisation */ 499 if (--width > sizeof(buf) - 2) 500 width = sizeof(buf) - 2; 501 width++; 502 #endif /* SM_CONF_BROKEN_SIZE_T */ 503 flags |= SIGNOK | NDIGITS | NZDIGITS; 504 for (p = buf; width > 0; width--) 505 { 506 c = *fp->f_p; 507 508 /* 509 ** Switch on the character; `goto ok' 510 ** if we accept it as a part of number. 511 */ 512 513 switch (c) 514 { 515 516 /* 517 ** The digit 0 is always legal, but is 518 ** special. For %i conversions, if no 519 ** digits (zero or nonzero) have been 520 ** scanned (only signs), we will have 521 ** base==0. In that case, we should set 522 ** it to 8 and enable 0x prefixing. 523 ** Also, if we have not scanned zero digits 524 ** before this, do not turn off prefixing 525 ** (someone else will turn it off if we 526 ** have scanned any nonzero digits). 527 */ 528 529 case '0': 530 if (base == 0) 531 { 532 base = 8; 533 flags |= PFXOK; 534 } 535 if (flags & NZDIGITS) 536 flags &= ~(SIGNOK|NZDIGITS|NDIGITS); 537 else 538 flags &= ~(SIGNOK|PFXOK|NDIGITS); 539 goto ok; 540 541 /* 1 through 7 always legal */ 542 case '1': case '2': case '3': 543 case '4': case '5': case '6': case '7': 544 base = basefix[base]; 545 flags &= ~(SIGNOK | PFXOK | NDIGITS); 546 goto ok; 547 548 /* digits 8 and 9 ok iff decimal or hex */ 549 case '8': case '9': 550 base = basefix[base]; 551 if (base <= 8) 552 break; /* not legal here */ 553 flags &= ~(SIGNOK | PFXOK | NDIGITS); 554 goto ok; 555 556 /* letters ok iff hex */ 557 case 'A': case 'B': case 'C': 558 case 'D': case 'E': case 'F': 559 case 'a': case 'b': case 'c': 560 case 'd': case 'e': case 'f': 561 562 /* no need to fix base here */ 563 if (base <= 10) 564 break; /* not legal here */ 565 flags &= ~(SIGNOK | PFXOK | NDIGITS); 566 goto ok; 567 568 /* sign ok only as first character */ 569 case '+': case '-': 570 if (flags & SIGNOK) 571 { 572 flags &= ~SIGNOK; 573 goto ok; 574 } 575 break; 576 577 /* x ok iff flag still set & 2nd char */ 578 case 'x': case 'X': 579 if (flags & PFXOK && p == buf + 1) 580 { 581 base = 16; /* if %i */ 582 flags &= ~PFXOK; 583 goto ok; 584 } 585 break; 586 } 587 588 /* 589 ** If we got here, c is not a legal character 590 ** for a number. Stop accumulating digits. 591 */ 592 593 break; 594 ok: 595 /* c is legal: store it and look at the next. */ 596 *p++ = c; 597 if (--fp->f_r > 0) 598 fp->f_p++; 599 else if (sm_refill(fp, SM_TIME_FOREVER)) 600 break; /* SM_IO_EOF */ 601 } 602 603 /* 604 ** If we had only a sign, it is no good; push 605 ** back the sign. If the number ends in `x', 606 ** it was [sign] '0' 'x', so push back the x 607 ** and treat it as [sign] '0'. 608 */ 609 610 if (flags & NDIGITS) 611 { 612 if (p > buf) 613 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, 614 *(unsigned char *)--p); 615 goto match_failure; 616 } 617 c = ((unsigned char *)p)[-1]; 618 if (c == 'x' || c == 'X') 619 { 620 --p; 621 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c); 622 } 623 if ((flags & SUPPRESS) == 0) 624 { 625 ULONGLONG_T res; 626 627 *p = 0; 628 res = (*ccfn)(buf, (char **)NULL, base); 629 if (flags & POINTER) 630 *SM_VA_ARG(ap, void **) = 631 (void *)(long) res; 632 else if (flags & QUAD) 633 *SM_VA_ARG(ap, LONGLONG_T *) = res; 634 else if (flags & LONG) 635 *SM_VA_ARG(ap, long *) = res; 636 else if (flags & SHORT) 637 *SM_VA_ARG(ap, short *) = res; 638 else 639 *SM_VA_ARG(ap, int *) = res; 640 nassigned++; 641 } 642 nread += p - buf; 643 break; 644 645 case CT_FLOAT: 646 /* scan a floating point number as if by strtod */ 647 if (width == 0 || width > sizeof(buf) - 1) 648 width = sizeof(buf) - 1; 649 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; 650 for (p = buf; width; width--) 651 { 652 c = *fp->f_p; 653 654 /* 655 ** This code mimicks the integer conversion 656 ** code, but is much simpler. 657 */ 658 659 switch (c) 660 { 661 662 case '0': case '1': case '2': case '3': 663 case '4': case '5': case '6': case '7': 664 case '8': case '9': 665 flags &= ~(SIGNOK | NDIGITS); 666 goto fok; 667 668 case '+': case '-': 669 if (flags & SIGNOK) 670 { 671 flags &= ~SIGNOK; 672 goto fok; 673 } 674 break; 675 case '.': 676 if (flags & DPTOK) 677 { 678 flags &= ~(SIGNOK | DPTOK); 679 goto fok; 680 } 681 break; 682 case 'e': case 'E': 683 684 /* no exponent without some digits */ 685 if ((flags&(NDIGITS|EXPOK)) == EXPOK) 686 { 687 flags = 688 (flags & ~(EXPOK|DPTOK)) | 689 SIGNOK | NDIGITS; 690 goto fok; 691 } 692 break; 693 } 694 break; 695 fok: 696 *p++ = c; 697 if (--fp->f_r > 0) 698 fp->f_p++; 699 else if (sm_refill(fp, SM_TIME_FOREVER)) 700 break; /* SM_IO_EOF */ 701 } 702 703 /* 704 ** If no digits, might be missing exponent digits 705 ** (just give back the exponent) or might be missing 706 ** regular digits, but had sign and/or decimal point. 707 */ 708 709 if (flags & NDIGITS) 710 { 711 if (flags & EXPOK) 712 { 713 /* no digits at all */ 714 while (p > buf) 715 (void) sm_io_ungetc(fp, 716 SM_TIME_DEFAULT, 717 *(unsigned char *)--p); 718 goto match_failure; 719 } 720 721 /* just a bad exponent (e and maybe sign) */ 722 c = *(unsigned char *) --p; 723 if (c != 'e' && c != 'E') 724 { 725 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, 726 c); /* sign */ 727 c = *(unsigned char *)--p; 728 } 729 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c); 730 } 731 if ((flags & SUPPRESS) == 0) 732 { 733 double res; 734 735 *p = 0; 736 res = strtod(buf, (char **) NULL); 737 if (flags & LONG) 738 *SM_VA_ARG(ap, double *) = res; 739 else 740 *SM_VA_ARG(ap, float *) = res; 741 nassigned++; 742 } 743 nread += p - buf; 744 break; 745 } 746 } 747 input_failure: 748 if (evt != NULL) 749 sm_clrevent(evt); /* undo our timeout */ 750 return nassigned ? nassigned : -1; 751 match_failure: 752 if (evt != NULL) 753 sm_clrevent(evt); /* undo our timeout */ 754 return nassigned; 755 } 756 757 /* 758 ** SM_SCCL -- sequenced character comparison list 759 ** 760 ** Fill in the given table from the scanset at the given format 761 ** (just after `['). Return a pointer to the character past the 762 ** closing `]'. The table has a 1 wherever characters should be 763 ** considered part of the scanset. 764 ** 765 ** Parameters: 766 ** tab -- array flagging "active" char's to match (returned) 767 ** fmt -- character list (within "[]") 768 ** 769 ** Results: 770 */ 771 772 static unsigned char * 773 sm_sccl(tab, fmt) 774 register char *tab; 775 register unsigned char *fmt; 776 { 777 register int c, n, v; 778 779 /* first `clear' the whole table */ 780 c = *fmt++; /* first char hat => negated scanset */ 781 if (c == '^') 782 { 783 v = 1; /* default => accept */ 784 c = *fmt++; /* get new first char */ 785 } 786 else 787 v = 0; /* default => reject */ 788 789 /* should probably use memset here */ 790 for (n = 0; n < 256; n++) 791 tab[n] = v; 792 if (c == 0) 793 return fmt - 1; /* format ended before closing ] */ 794 795 /* 796 ** Now set the entries corresponding to the actual scanset 797 ** to the opposite of the above. 798 ** 799 ** The first character may be ']' (or '-') without being special; 800 ** the last character may be '-'. 801 */ 802 803 v = 1 - v; 804 for (;;) 805 { 806 tab[c] = v; /* take character c */ 807 doswitch: 808 n = *fmt++; /* and examine the next */ 809 switch (n) 810 { 811 812 case 0: /* format ended too soon */ 813 return fmt - 1; 814 815 case '-': 816 /* 817 ** A scanset of the form 818 ** [01+-] 819 ** is defined as `the digit 0, the digit 1, 820 ** the character +, the character -', but 821 ** the effect of a scanset such as 822 ** [a-zA-Z0-9] 823 ** is implementation defined. The V7 Unix 824 ** scanf treats `a-z' as `the letters a through 825 ** z', but treats `a-a' as `the letter a, the 826 ** character -, and the letter a'. 827 ** 828 ** For compatibility, the `-' is not considerd 829 ** to define a range if the character following 830 ** it is either a close bracket (required by ANSI) 831 ** or is not numerically greater than the character 832 ** we just stored in the table (c). 833 */ 834 835 n = *fmt; 836 if (n == ']' || n < c) 837 { 838 c = '-'; 839 break; /* resume the for(;;) */ 840 } 841 fmt++; 842 do 843 { 844 /* fill in the range */ 845 tab[++c] = v; 846 } while (c < n); 847 #if 1 /* XXX another disgusting compatibility hack */ 848 849 /* 850 ** Alas, the V7 Unix scanf also treats formats 851 ** such as [a-c-e] as `the letters a through e'. 852 ** This too is permitted by the standard.... 853 */ 854 855 goto doswitch; 856 #else 857 c = *fmt++; 858 if (c == 0) 859 return fmt - 1; 860 if (c == ']') 861 return fmt; 862 break; 863 #endif 864 865 case ']': /* end of scanset */ 866 return fmt; 867 868 default: /* just another character */ 869 c = n; 870 break; 871 } 872 } 873 /* NOTREACHED */ 874 } 875