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Import sendmail 8.13.7
[dragonfly.git] / contrib / sendmail-8.13.7 / libsm / vfscanf.c
blob235ee42546238247521260299c41c454863b769c
1 /*
2 * Copyright (c) 2000-2001, 2004 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 1.53 2005/06/14 23:07:20 ca Exp $")
17
18 #include <ctype.h>
19 #include <stdlib.h>
20 #include <errno.h>
21 #include <setjmp.h>
22 #include <sm/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 void scanalrm __P((int));
64 static unsigned char *sm_sccl __P((char *, unsigned char *));
65 static jmp_buf ScanTimeOut;
66
67 /*
68 ** SCANALRM -- handler when timeout activated for sm_io_vfscanf()
69 **
70 ** Returns flow of control to where setjmp(ScanTimeOut) was set.
71 **
72 ** Parameters:
73 ** sig -- unused
74 **
75 ** Returns:
76 ** does not return
77 **
78 ** Side Effects:
79 ** returns flow of control to setjmp(ScanTimeOut).
80 **
81 ** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD
82 ** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
83 ** DOING.
84 */
85
86 /* ARGSUSED0 */
87 static void
88 scanalrm(sig)
89 int sig;
90 {
91 longjmp(ScanTimeOut, 1);
92 }
93
94 /*
95 ** SM_VFSCANF -- convert input into data units
96 **
97 ** Parameters:
98 ** fp -- file pointer for input data
99 ** timeout -- time intvl allowed to complete (milliseconds)
100 ** fmt0 -- format for finding data units
101 ** ap -- vectors for memory location for storing data units
102 **
103 ** Results:
104 ** Success: number of data units assigned
105 ** Failure: SM_IO_EOF
106 */
107
108 int
109 sm_vfscanf(fp, timeout, fmt0, ap)
110 register SM_FILE_T *fp;
111 int SM_NONVOLATILE timeout;
112 char const *fmt0;
113 va_list SM_NONVOLATILE ap;
114 {
115 register unsigned char *SM_NONVOLATILE fmt = (unsigned char *) fmt0;
116 register int c; /* character from format, or conversion */
117 register size_t width; /* field width, or 0 */
118 register char *p; /* points into all kinds of strings */
119 register int n; /* handy integer */
120 register int flags; /* flags as defined above */
121 register char *p0; /* saves original value of p when necessary */
122 int nassigned; /* number of fields assigned */
123 int nread; /* number of characters consumed from fp */
124 int base; /* base argument to strtoll/strtoull */
125 ULONGLONG_T (*ccfn)(); /* conversion function (strtoll/strtoull) */
126 char ccltab[256]; /* character class table for %[...] */
127 char buf[BUF]; /* buffer for numeric conversions */
128 SM_EVENT *evt = NULL;
129
130 /* `basefix' is used to avoid `if' tests in the integer scanner */
131 static short basefix[17] =
132 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
133
134 if (timeout == SM_TIME_DEFAULT)
135 timeout = fp->f_timeout;
136 if (timeout == SM_TIME_IMMEDIATE)
137 {
138 /*
139 ** Filling the buffer will take time and we are wanted to
140 ** return immediately. So...
141 */
142
143 errno = EAGAIN;
144 return SM_IO_EOF;
145 }
146
147 if (timeout != SM_TIME_FOREVER)
148 {
149 if (setjmp(ScanTimeOut) != 0)
150 {
151 errno = EAGAIN;
152 return SM_IO_EOF;
153 }
154
155 evt = sm_seteventm(timeout, scanalrm, 0);
156 }
157
158 nassigned = 0;
159 nread = 0;
160 base = 0; /* XXX just to keep gcc happy */
161 ccfn = NULL; /* XXX just to keep gcc happy */
162 for (;;)
163 {
164 c = *fmt++;
165 if (c == 0)
166 {
167 if (evt != NULL)
168 sm_clrevent(evt); /* undo our timeout */
169 return nassigned;
170 }
171 if (isspace(c))
172 {
173 while ((fp->f_r > 0 || sm_refill(fp, SM_TIME_FOREVER)
174 == 0) &&
175 isspace(*fp->f_p))
176 nread++, fp->f_r--, fp->f_p++;
177 continue;
178 }
179 if (c != '%')
180 goto literal;
181 width = 0;
182 flags = 0;
183
184 /*
185 ** switch on the format. continue if done;
186 ** break once format type is derived.
187 */
188
189 again: c = *fmt++;
190 switch (c)
191 {
192 case '%':
193 literal:
194 if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER))
195 goto input_failure;
196 if (*fp->f_p != c)
197 goto match_failure;
198 fp->f_r--, fp->f_p++;
199 nread++;
200 continue;
201
202 case '*':
203 flags |= SUPPRESS;
204 goto again;
205 case 'h':
206 flags |= SHORT;
207 goto again;
208 case 'l':
209 if (*fmt == 'l')
210 {
211 fmt++;
212 flags |= QUAD;
213 }
214 else
215 {
216 flags |= LONG;
217 }
218 goto again;
219 case 'q':
220 flags |= QUAD;
221 goto again;
222
223 case '0': case '1': case '2': case '3': case '4':
224 case '5': case '6': case '7': case '8': case '9':
225 width = width * 10 + c - '0';
226 goto again;
227
228 /*
229 ** Conversions.
230 ** Those marked `compat' are for 4.[123]BSD compatibility.
231 **
232 ** (According to ANSI, E and X formats are supposed
233 ** to the same as e and x. Sorry about that.)
234 */
235
236 case 'D': /* compat */
237 flags |= LONG;
238 /* FALLTHROUGH */
239 case 'd':
240 c = CT_INT;
241 ccfn = (ULONGLONG_T (*)())sm_strtoll;
242 base = 10;
243 break;
244
245 case 'i':
246 c = CT_INT;
247 ccfn = (ULONGLONG_T (*)())sm_strtoll;
248 base = 0;
249 break;
250
251 case 'O': /* compat */
252 flags |= LONG;
253 /* FALLTHROUGH */
254 case 'o':
255 c = CT_INT;
256 ccfn = sm_strtoull;
257 base = 8;
258 break;
259
260 case 'u':
261 c = CT_INT;
262 ccfn = sm_strtoull;
263 base = 10;
264 break;
265
266 case 'X':
267 case 'x':
268 flags |= PFXOK; /* enable 0x prefixing */
269 c = CT_INT;
270 ccfn = sm_strtoull;
271 base = 16;
272 break;
273
274 case 'E':
275 case 'G':
276 case 'e':
277 case 'f':
278 case 'g':
279 c = CT_FLOAT;
280 break;
281
282 case 's':
283 c = CT_STRING;
284 break;
285
286 case '[':
287 fmt = sm_sccl(ccltab, fmt);
288 flags |= NOSKIP;
289 c = CT_CCL;
290 break;
291
292 case 'c':
293 flags |= NOSKIP;
294 c = CT_CHAR;
295 break;
296
297 case 'p': /* pointer format is like hex */
298 flags |= POINTER | PFXOK;
299 c = CT_INT;
300 ccfn = sm_strtoull;
301 base = 16;
302 break;
303
304 case 'n':
305 if (flags & SUPPRESS) /* ??? */
306 continue;
307 if (flags & SHORT)
308 *SM_VA_ARG(ap, short *) = nread;
309 else if (flags & LONG)
310 *SM_VA_ARG(ap, long *) = nread;
311 else
312 *SM_VA_ARG(ap, int *) = nread;
313 continue;
314
315 /* Disgusting backwards compatibility hacks. XXX */
316 case '\0': /* compat */
317 if (evt != NULL)
318 sm_clrevent(evt); /* undo our timeout */
319 return SM_IO_EOF;
320
321 default: /* compat */
322 if (isupper(c))
323 flags |= LONG;
324 c = CT_INT;
325 ccfn = (ULONGLONG_T (*)()) sm_strtoll;
326 base = 10;
327 break;
328 }
329
330 /* We have a conversion that requires input. */
331 if (fp->f_r <= 0 && sm_refill(fp, SM_TIME_FOREVER))
332 goto input_failure;
333
334 /*
335 ** Consume leading white space, except for formats
336 ** that suppress this.
337 */
338
339 if ((flags & NOSKIP) == 0)
340 {
341 while (isspace(*fp->f_p))
342 {
343 nread++;
344 if (--fp->f_r > 0)
345 fp->f_p++;
346 else if (sm_refill(fp, SM_TIME_FOREVER))
347 goto input_failure;
348 }
349 /*
350 ** Note that there is at least one character in
351 ** the buffer, so conversions that do not set NOSKIP
352 ** can no longer result in an input failure.
353 */
354 }
355
356 /* Do the conversion. */
357 switch (c)
358 {
359 case CT_CHAR:
360 /* scan arbitrary characters (sets NOSKIP) */
361 if (width == 0)
362 width = 1;
363 if (flags & SUPPRESS)
364 {
365 size_t sum = 0;
366 for (;;)
367 {
368 if ((size_t) (n = fp->f_r) < width)
369 {
370 sum += n;
371 width -= n;
372 fp->f_p += n;
373 if (sm_refill(fp,
374 SM_TIME_FOREVER))
375 {
376 if (sum == 0)
377 goto input_failure;
378 break;
379 }
380 }
381 else
382 {
383 sum += width;
384 fp->f_r -= width;
385 fp->f_p += width;
386 break;
387 }
388 }
389 nread += sum;
390 }
391 else
392 {
393 size_t r;
394
395 r = sm_io_read(fp, SM_TIME_FOREVER,
396 (void *) SM_VA_ARG(ap, char *),
397 width);
398 if (r == 0)
399 goto input_failure;
400 nread += r;
401 nassigned++;
402 }
403 break;
404
405 case CT_CCL:
406 /* scan a (nonempty) character class (sets NOSKIP) */
407 if (width == 0)
408 width = (size_t)~0; /* `infinity' */
409
410 /* take only those things in the class */
411 if (flags & SUPPRESS)
412 {
413 n = 0;
414 while (ccltab[*fp->f_p] != '\0')
415 {
416 n++, fp->f_r--, fp->f_p++;
417 if (--width == 0)
418 break;
419 if (fp->f_r <= 0 &&
420 sm_refill(fp, SM_TIME_FOREVER))
421 {
422 if (n == 0) /* XXX how? */
423 goto input_failure;
424 break;
425 }
426 }
427 if (n == 0)
428 goto match_failure;
429 }
430 else
431 {
432 p0 = p = SM_VA_ARG(ap, char *);
433 while (ccltab[*fp->f_p] != '\0')
434 {
435 fp->f_r--;
436 *p++ = *fp->f_p++;
437 if (--width == 0)
438 break;
439 if (fp->f_r <= 0 &&
440 sm_refill(fp, SM_TIME_FOREVER))
441 {
442 if (p == p0)
443 goto input_failure;
444 break;
445 }
446 }
447 n = p - p0;
448 if (n == 0)
449 goto match_failure;
450 *p = 0;
451 nassigned++;
452 }
453 nread += n;
454 break;
455
456 case CT_STRING:
457 /* like CCL, but zero-length string OK, & no NOSKIP */
458 if (width == 0)
459 width = (size_t)~0;
460 if (flags & SUPPRESS)
461 {
462 n = 0;
463 while (!isspace(*fp->f_p))
464 {
465 n++, fp->f_r--, fp->f_p++;
466 if (--width == 0)
467 break;
468 if (fp->f_r <= 0 &&
469 sm_refill(fp, SM_TIME_FOREVER))
470 break;
471 }
472 nread += n;
473 }
474 else
475 {
476 p0 = p = SM_VA_ARG(ap, char *);
477 while (!isspace(*fp->f_p))
478 {
479 fp->f_r--;
480 *p++ = *fp->f_p++;
481 if (--width == 0)
482 break;
483 if (fp->f_r <= 0 &&
484 sm_refill(fp, SM_TIME_FOREVER))
485 break;
486 }
487 *p = 0;
488 nread += p - p0;
489 nassigned++;
490 }
491 continue;
492
493 case CT_INT:
494 /* scan an integer as if by strtoll/strtoull */
495 #if SM_CONF_BROKEN_SIZE_T
496 if (width == 0 || width > sizeof(buf) - 1)
497 width = sizeof(buf) - 1;
498 #else /* SM_CONF_BROKEN_SIZE_T */
499 /* size_t is unsigned, hence this optimisation */
500 if (--width > sizeof(buf) - 2)
501 width = sizeof(buf) - 2;
502 width++;
503 #endif /* SM_CONF_BROKEN_SIZE_T */
504 flags |= SIGNOK | NDIGITS | NZDIGITS;
505 for (p = buf; width > 0; width--)
506 {
507 c = *fp->f_p;
508
509 /*
510 ** Switch on the character; `goto ok'
511 ** if we accept it as a part of number.
512 */
513
514 switch (c)
515 {
516
517 /*
518 ** The digit 0 is always legal, but is
519 ** special. For %i conversions, if no
520 ** digits (zero or nonzero) have been
521 ** scanned (only signs), we will have
522 ** base==0. In that case, we should set
523 ** it to 8 and enable 0x prefixing.
524 ** Also, if we have not scanned zero digits
525 ** before this, do not turn off prefixing
526 ** (someone else will turn it off if we
527 ** have scanned any nonzero digits).
528 */
529
530 case '0':
531 if (base == 0)
532 {
533 base = 8;
534 flags |= PFXOK;
535 }
536 if (flags & NZDIGITS)
537 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
538 else
539 flags &= ~(SIGNOK|PFXOK|NDIGITS);
540 goto ok;
541
542 /* 1 through 7 always legal */
543 case '1': case '2': case '3':
544 case '4': case '5': case '6': case '7':
545 base = basefix[base];
546 flags &= ~(SIGNOK | PFXOK | NDIGITS);
547 goto ok;
548
549 /* digits 8 and 9 ok iff decimal or hex */
550 case '8': case '9':
551 base = basefix[base];
552 if (base <= 8)
553 break; /* not legal here */
554 flags &= ~(SIGNOK | PFXOK | NDIGITS);
555 goto ok;
556
557 /* letters ok iff hex */
558 case 'A': case 'B': case 'C':
559 case 'D': case 'E': case 'F':
560 case 'a': case 'b': case 'c':
561 case 'd': case 'e': case 'f':
562
563 /* no need to fix base here */
564 if (base <= 10)
565 break; /* not legal here */
566 flags &= ~(SIGNOK | PFXOK | NDIGITS);
567 goto ok;
568
569 /* sign ok only as first character */
570 case '+': case '-':
571 if (flags & SIGNOK)
572 {
573 flags &= ~SIGNOK;
574 goto ok;
575 }
576 break;
577
578 /* x ok iff flag still set & 2nd char */
579 case 'x': case 'X':
580 if (flags & PFXOK && p == buf + 1)
581 {
582 base = 16; /* if %i */
583 flags &= ~PFXOK;
584 goto ok;
585 }
586 break;
587 }
588
589 /*
590 ** If we got here, c is not a legal character
591 ** for a number. Stop accumulating digits.
592 */
593
594 break;
595 ok:
596 /* c is legal: store it and look at the next. */
597 *p++ = c;
598 if (--fp->f_r > 0)
599 fp->f_p++;
600 else if (sm_refill(fp, SM_TIME_FOREVER))
601 break; /* SM_IO_EOF */
602 }
603
604 /*
605 ** If we had only a sign, it is no good; push
606 ** back the sign. If the number ends in `x',
607 ** it was [sign] '0' 'x', so push back the x
608 ** and treat it as [sign] '0'.
609 */
610
611 if (flags & NDIGITS)
612 {
613 if (p > buf)
614 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT,
615 *(unsigned char *)--p);
616 goto match_failure;
617 }
618 c = ((unsigned char *)p)[-1];
619 if (c == 'x' || c == 'X')
620 {
621 --p;
622 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c);
623 }
624 if ((flags & SUPPRESS) == 0)
625 {
626 ULONGLONG_T res;
627
628 *p = 0;
629 res = (*ccfn)(buf, (char **)NULL, base);
630 if (flags & POINTER)
631 *SM_VA_ARG(ap, void **) =
632 (void *)(long) res;
633 else if (flags & QUAD)
634 *SM_VA_ARG(ap, LONGLONG_T *) = res;
635 else if (flags & LONG)
636 *SM_VA_ARG(ap, long *) = res;
637 else if (flags & SHORT)
638 *SM_VA_ARG(ap, short *) = res;
639 else
640 *SM_VA_ARG(ap, int *) = res;
641 nassigned++;
642 }
643 nread += p - buf;
644 break;
645
646 case CT_FLOAT:
647 /* scan a floating point number as if by strtod */
648 if (width == 0 || width > sizeof(buf) - 1)
649 width = sizeof(buf) - 1;
650 flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
651 for (p = buf; width; width--)
652 {
653 c = *fp->f_p;
654
655 /*
656 ** This code mimicks the integer conversion
657 ** code, but is much simpler.
658 */
659
660 switch (c)
661 {
662
663 case '0': case '1': case '2': case '3':
664 case '4': case '5': case '6': case '7':
665 case '8': case '9':
666 flags &= ~(SIGNOK | NDIGITS);
667 goto fok;
668
669 case '+': case '-':
670 if (flags & SIGNOK)
671 {
672 flags &= ~SIGNOK;
673 goto fok;
674 }
675 break;
676 case '.':
677 if (flags & DPTOK)
678 {
679 flags &= ~(SIGNOK | DPTOK);
680 goto fok;
681 }
682 break;
683 case 'e': case 'E':
684
685 /* no exponent without some digits */
686 if ((flags&(NDIGITS|EXPOK)) == EXPOK)
687 {
688 flags =
689 (flags & ~(EXPOK|DPTOK)) |
690 SIGNOK | NDIGITS;
691 goto fok;
692 }
693 break;
694 }
695 break;
696 fok:
697 *p++ = c;
698 if (--fp->f_r > 0)
699 fp->f_p++;
700 else if (sm_refill(fp, SM_TIME_FOREVER))
701 break; /* SM_IO_EOF */
702 }
703
704 /*
705 ** If no digits, might be missing exponent digits
706 ** (just give back the exponent) or might be missing
707 ** regular digits, but had sign and/or decimal point.
708 */
709
710 if (flags & NDIGITS)
711 {
712 if (flags & EXPOK)
713 {
714 /* no digits at all */
715 while (p > buf)
716 (void) sm_io_ungetc(fp,
717 SM_TIME_DEFAULT,
718 *(unsigned char *)--p);
719 goto match_failure;
720 }
721
722 /* just a bad exponent (e and maybe sign) */
723 c = *(unsigned char *) --p;
724 if (c != 'e' && c != 'E')
725 {
726 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT,
727 c); /* sign */
728 c = *(unsigned char *)--p;
729 }
730 (void) sm_io_ungetc(fp, SM_TIME_DEFAULT, c);
731 }
732 if ((flags & SUPPRESS) == 0)
733 {
734 double res;
735
736 *p = 0;
737 res = strtod(buf, (char **) NULL);
738 if (flags & LONG)
739 *SM_VA_ARG(ap, double *) = res;
740 else
741 *SM_VA_ARG(ap, float *) = res;
742 nassigned++;
743 }
744 nread += p - buf;
745 break;
746 }
747 }
748 input_failure:
749 if (evt != NULL)
750 sm_clrevent(evt); /* undo our timeout */
751 return nassigned ? nassigned : -1;
752 match_failure:
753 if (evt != NULL)
754 sm_clrevent(evt); /* undo our timeout */
755 return nassigned;
756 }
757
758 /*
759 ** SM_SCCL -- sequenced character comparison list
760 **
761 ** Fill in the given table from the scanset at the given format
762 ** (just after `['). Return a pointer to the character past the
763 ** closing `]'. The table has a 1 wherever characters should be
764 ** considered part of the scanset.
765 **
766 ** Parameters:
767 ** tab -- array flagging "active" char's to match (returned)
768 ** fmt -- character list (within "[]")
769 **
770 ** Results:
771 */
772
773 static unsigned char *
774 sm_sccl(tab, fmt)
775 register char *tab;
776 register unsigned char *fmt;
777 {
778 register int c, n, v;
779
780 /* first `clear' the whole table */
781 c = *fmt++; /* first char hat => negated scanset */
782 if (c == '^')
783 {
784 v = 1; /* default => accept */
785 c = *fmt++; /* get new first char */
786 }
787 else
788 v = 0; /* default => reject */
789
790 /* should probably use memset here */
791 for (n = 0; n < 256; n++)
792 tab[n] = v;
793 if (c == 0)
794 return fmt - 1; /* format ended before closing ] */
795
796 /*
797 ** Now set the entries corresponding to the actual scanset
798 ** to the opposite of the above.
799 **
800 ** The first character may be ']' (or '-') without being special;
801 ** the last character may be '-'.
802 */
803
804 v = 1 - v;
805 for (;;)
806 {
807 tab[c] = v; /* take character c */
808 doswitch:
809 n = *fmt++; /* and examine the next */
810 switch (n)
811 {
812
813 case 0: /* format ended too soon */
814 return fmt - 1;
815
816 case '-':
817 /*
818 ** A scanset of the form
819 ** [01+-]
820 ** is defined as `the digit 0, the digit 1,
821 ** the character +, the character -', but
822 ** the effect of a scanset such as
823 ** [a-zA-Z0-9]
824 ** is implementation defined. The V7 Unix
825 ** scanf treats `a-z' as `the letters a through
826 ** z', but treats `a-a' as `the letter a, the
827 ** character -, and the letter a'.
828 **
829 ** For compatibility, the `-' is not considerd
830 ** to define a range if the character following
831 ** it is either a close bracket (required by ANSI)
832 ** or is not numerically greater than the character
833 ** we just stored in the table (c).
834 */
835
836 n = *fmt;
837 if (n == ']' || n < c)
838 {
839 c = '-';
840 break; /* resume the for(;;) */
841 }
842 fmt++;
843 do
844 {
845 /* fill in the range */
846 tab[++c] = v;
847 } while (c < n);
848 #if 1 /* XXX another disgusting compatibility hack */
849
850 /*
851 ** Alas, the V7 Unix scanf also treats formats
852 ** such as [a-c-e] as `the letters a through e'.
853 ** This too is permitted by the standard....
854 */
855
856 goto doswitch;
857 #else
858 c = *fmt++;
859 if (c == 0)
860 return fmt - 1;
861 if (c == ']')
862 return fmt;
863 break;
864 #endif
865
866 case ']': /* end of scanset */
867 return fmt;
868
869 default: /* just another character */
870 c = n;
871 break;
872 }
873 }
874 /* NOTREACHED */
875 }
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