2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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36 * $FreeBSD: src/sys/kern/subr_scanf.c,v 1.13 1999/11/24 01:03:01 archie Exp $
37 * $DragonFly: src/sys/kern/subr_scanf.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
38 * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp
39 * From: static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93";
40 * From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/ctype.h>
46 #include <machine/limits.h>
49 * Note that stdarg.h and the ANSI style va_start macro is used for both
50 * ANSI and traditional C compilers.
52 #include <machine/stdarg.h>
54 #define BUF 32 /* Maximum length of numeric string. */
57 * Flags used during conversion.
59 #define LONG 0x01 /* l: long or double */
60 #define SHORT 0x04 /* h: short */
61 #define SUPPRESS 0x08 /* suppress assignment */
62 #define POINTER 0x10 /* weird %p pointer (`fake hex') */
63 #define NOSKIP 0x20 /* do not skip blanks */
67 * The following are used in numeric conversions only:
68 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
69 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
71 #define SIGNOK 0x40 /* +/- is (still) legal */
72 #define NDIGITS 0x80 /* no digits detected */
74 #define DPTOK 0x100 /* (float) decimal point is still legal */
75 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
77 #define PFXOK 0x100 /* 0x prefix is (still) legal */
78 #define NZDIGITS 0x200 /* no zero digits detected */
83 #define CT_CHAR 0 /* %c conversion */
84 #define CT_CCL 1 /* %[...] conversion */
85 #define CT_STRING 2 /* %s conversion */
86 #define CT_INT 3 /* integer, i.e., strtoq or strtouq */
87 typedef u_quad_t (*ccfntype)(const char *, char **, int);
89 static const u_char *__sccl(char *, const u_char *);
92 sscanf(const char *ibuf, const char *fmt, ...)
98 ret = vsscanf(ibuf, fmt, ap);
104 vsscanf(const char *inp, char const *fmt0, va_list ap)
107 const u_char *fmt = (const u_char *)fmt0;
108 int c; /* character from format, or conversion */
109 size_t width; /* field width, or 0 */
110 char *p; /* points into all kinds of strings */
111 int n; /* handy integer */
112 int flags; /* flags as defined above */
113 char *p0; /* saves original value of p when necessary */
114 int nassigned; /* number of fields assigned */
115 int nconversions; /* number of conversions */
116 int nread; /* number of characters consumed from fp */
117 int base; /* base argument to strtoq/strtouq */
118 ccfntype ccfn; /* conversion function (strtoq/strtouq) */
119 char ccltab[256]; /* character class table for %[...] */
120 char buf[BUF]; /* buffer for numeric conversions */
122 /* `basefix' is used to avoid `if' tests in the integer scanner */
123 static short basefix[17] =
124 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
131 base = 0; /* XXX just to keep gcc happy */
132 ccfn = NULL; /* XXX just to keep gcc happy */
138 while (inr > 0 && isspace(*inp))
139 nread++, inr--, inp++;
147 * switch on the format. continue if done;
148 * break once format type is derived.
175 case '0': case '1': case '2': case '3': case '4':
176 case '5': case '6': case '7': case '8': case '9':
177 width = width * 10 + c - '0';
186 ccfn = (ccfntype)strtoq;
192 ccfn = (ccfntype)strtoq;
209 flags |= PFXOK; /* enable 0x prefixing */
220 fmt = __sccl(ccltab, fmt);
230 case 'p': /* pointer format is like hex */
231 flags |= POINTER | PFXOK;
239 if (flags & SUPPRESS) /* ??? */
242 *va_arg(ap, short *) = nread;
243 else if (flags & LONG)
244 *va_arg(ap, long *) = nread;
245 else if (flags & QUAD)
246 *va_arg(ap, quad_t *) = nread;
248 *va_arg(ap, int *) = nread;
253 * We have a conversion that requires input.
259 * Consume leading white space, except for formats
260 * that suppress this.
262 if ((flags & NOSKIP) == 0) {
263 while (isspace(*inp)) {
271 * Note that there is at least one character in
272 * the buffer, so conversions that do not set NOSKIP
273 * can no longer result in an input failure.
283 /* scan arbitrary characters (sets NOSKIP) */
286 if (flags & SUPPRESS) {
289 if ((n = inr) < width) {
305 bcopy(inp, va_arg(ap, char *), width);
315 /* scan a (nonempty) character class (sets NOSKIP) */
317 width = (size_t)~0; /* `infinity' */
318 /* take only those things in the class */
319 if (flags & SUPPRESS) {
321 while (ccltab[(unsigned char)*inp]) {
334 p0 = p = va_arg(ap, char *);
335 while (ccltab[(unsigned char)*inp]) {
357 /* like CCL, but zero-length string OK, & no NOSKIP */
360 if (flags & SUPPRESS) {
362 while (!isspace(*inp)) {
371 p0 = p = va_arg(ap, char *);
372 while (!isspace(*inp)) {
388 /* scan an integer as if by strtoq/strtouq */
390 if (width == 0 || width > sizeof(buf) - 1)
391 width = sizeof(buf) - 1;
393 /* size_t is unsigned, hence this optimisation */
394 if (--width > sizeof(buf) - 2)
395 width = sizeof(buf) - 2;
398 flags |= SIGNOK | NDIGITS | NZDIGITS;
399 for (p = buf; width; width--) {
402 * Switch on the character; `goto ok'
403 * if we accept it as a part of number.
408 * The digit 0 is always legal, but is
409 * special. For %i conversions, if no
410 * digits (zero or nonzero) have been
411 * scanned (only signs), we will have
412 * base==0. In that case, we should set
413 * it to 8 and enable 0x prefixing.
414 * Also, if we have not scanned zero digits
415 * before this, do not turn off prefixing
416 * (someone else will turn it off if we
417 * have scanned any nonzero digits).
424 if (flags & NZDIGITS)
425 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
427 flags &= ~(SIGNOK|PFXOK|NDIGITS);
430 /* 1 through 7 always legal */
431 case '1': case '2': case '3':
432 case '4': case '5': case '6': case '7':
433 base = basefix[base];
434 flags &= ~(SIGNOK | PFXOK | NDIGITS);
437 /* digits 8 and 9 ok iff decimal or hex */
439 base = basefix[base];
441 break; /* not legal here */
442 flags &= ~(SIGNOK | PFXOK | NDIGITS);
445 /* letters ok iff hex */
446 case 'A': case 'B': case 'C':
447 case 'D': case 'E': case 'F':
448 case 'a': case 'b': case 'c':
449 case 'd': case 'e': case 'f':
450 /* no need to fix base here */
452 break; /* not legal here */
453 flags &= ~(SIGNOK | PFXOK | NDIGITS);
456 /* sign ok only as first character */
458 if (flags & SIGNOK) {
464 /* x ok iff flag still set & 2nd char */
466 if (flags & PFXOK && p == buf + 1) {
467 base = 16; /* if %i */
475 * If we got here, c is not a legal character
476 * for a number. Stop accumulating digits.
481 * c is legal: store it and look at the next.
487 break; /* end of input */
490 * If we had only a sign, it is no good; push
491 * back the sign. If the number ends in `x',
492 * it was [sign] '0' 'x', so push back the x
493 * and treat it as [sign] '0'.
495 if (flags & NDIGITS) {
502 c = ((u_char *)p)[-1];
503 if (c == 'x' || c == 'X') {
508 if ((flags & SUPPRESS) == 0) {
512 res = (*ccfn)(buf, (char **)NULL, base);
514 *va_arg(ap, void **) =
515 (void *)(uintptr_t)res;
516 else if (flags & SHORT)
517 *va_arg(ap, short *) = res;
518 else if (flags & LONG)
519 *va_arg(ap, long *) = res;
520 else if (flags & QUAD)
521 *va_arg(ap, quad_t *) = res;
523 *va_arg(ap, int *) = res;
533 return (nconversions != 0 ? nassigned : -1);
539 * Fill in the given table from the scanset at the given format
540 * (just after `['). Return a pointer to the character past the
541 * closing `]'. The table has a 1 wherever characters should be
542 * considered part of the scanset.
544 static const u_char *
545 __sccl(char *tab, const u_char *fmt)
549 /* first `clear' the whole table */
550 c = *fmt++; /* first char hat => negated scanset */
552 v = 1; /* default => accept */
553 c = *fmt++; /* get new first char */
555 v = 0; /* default => reject */
557 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
558 for (n = 0; n < 256; n++)
559 tab[n] = v; /* memset(tab, v, 256) */
562 return (fmt - 1);/* format ended before closing ] */
565 * Now set the entries corresponding to the actual scanset
566 * to the opposite of the above.
568 * The first character may be ']' (or '-') without being special;
569 * the last character may be '-'.
573 tab[c] = v; /* take character c */
575 n = *fmt++; /* and examine the next */
578 case 0: /* format ended too soon */
583 * A scanset of the form
585 * is defined as `the digit 0, the digit 1,
586 * the character +, the character -', but
587 * the effect of a scanset such as
589 * is implementation defined. The V7 Unix
590 * scanf treats `a-z' as `the letters a through
591 * z', but treats `a-a' as `the letter a, the
592 * character -, and the letter a'.
594 * For compatibility, the `-' is not considerd
595 * to define a range if the character following
596 * it is either a close bracket (required by ANSI)
597 * or is not numerically greater than the character
598 * we just stored in the table (c).
601 if (n == ']' || n < c) {
603 break; /* resume the for(;;) */
606 /* fill in the range */
612 * Alas, the V7 Unix scanf also treats formats
613 * such as [a-c-e] as `the letters a through e'.
614 * This too is permitted by the standard....
619 case ']': /* end of scanset */
622 default: /* just another character */