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5 * This code is derived from software contributed to Berkeley by
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32 * $FreeBSD: src/sys/kern/subr_scanf.c,v 1.13 1999/11/24 01:03:01 archie Exp $
33 * $DragonFly: src/sys/kern/subr_scanf.c,v 1.4 2006/12/13 21:58:50 dillon Exp $
34 * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp
35 * From: static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93";
36 * From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/ctype.h>
42 #include <machine/limits.h>
45 * Note that stdarg.h and the ANSI style va_start macro is used for both
46 * ANSI and traditional C compilers.
48 #include <machine/stdarg.h>
50 #define BUF 32 /* Maximum length of numeric string. */
53 * Flags used during conversion.
55 #define LONG 0x01 /* l: long or double */
56 #define SHORT 0x04 /* h: short */
57 #define SUPPRESS 0x08 /* suppress assignment */
58 #define POINTER 0x10 /* weird %p pointer (`fake hex') */
59 #define NOSKIP 0x20 /* do not skip blanks */
63 * The following are used in numeric conversions only:
64 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
65 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
67 #define SIGNOK 0x40 /* +/- is (still) legal */
68 #define NDIGITS 0x80 /* no digits detected */
70 #define DPTOK 0x100 /* (float) decimal point is still legal */
71 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
73 #define PFXOK 0x100 /* 0x prefix is (still) legal */
74 #define NZDIGITS 0x200 /* no zero digits detected */
79 #define CT_CHAR 0 /* %c conversion */
80 #define CT_CCL 1 /* %[...] conversion */
81 #define CT_STRING 2 /* %s conversion */
82 #define CT_INT 3 /* integer, i.e., strtoq or strtouq */
83 typedef u_quad_t (*ccfntype)(const char *, char **, int);
85 static const u_char *__sccl(char *, const u_char *);
88 ksscanf(const char *ibuf, const char *fmt, ...)
94 ret = kvsscanf(ibuf, fmt, ap);
100 kvsscanf(const char *inp, char const *fmt0, __va_list ap)
103 const u_char *fmt = (const u_char *)fmt0;
104 int c; /* character from format, or conversion */
105 size_t width; /* field width, or 0 */
106 char *p; /* points into all kinds of strings */
107 int n; /* handy integer */
108 int flags; /* flags as defined above */
109 char *p0; /* saves original value of p when necessary */
110 int nassigned; /* number of fields assigned */
111 int nconversions; /* number of conversions */
112 int nread; /* number of characters consumed from fp */
113 int base; /* base argument to strtoq/strtouq */
114 ccfntype ccfn; /* conversion function (strtoq/strtouq) */
115 char ccltab[256]; /* character class table for %[...] */
116 char buf[BUF]; /* buffer for numeric conversions */
118 /* `basefix' is used to avoid `if' tests in the integer scanner */
119 static short basefix[17] =
120 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
127 base = 0; /* XXX just to keep gcc happy */
128 ccfn = NULL; /* XXX just to keep gcc happy */
134 while (inr > 0 && isspace(*inp))
135 nread++, inr--, inp++;
143 * switch on the format. continue if done;
144 * break once format type is derived.
171 case '0': case '1': case '2': case '3': case '4':
172 case '5': case '6': case '7': case '8': case '9':
173 width = width * 10 + c - '0';
182 ccfn = (ccfntype)strtoq;
188 ccfn = (ccfntype)strtoq;
205 flags |= PFXOK; /* enable 0x prefixing */
216 fmt = __sccl(ccltab, fmt);
226 case 'p': /* pointer format is like hex */
227 flags |= POINTER | PFXOK;
235 if (flags & SUPPRESS) /* ??? */
238 *__va_arg(ap, short *) = nread;
239 else if (flags & LONG)
240 *__va_arg(ap, long *) = nread;
241 else if (flags & QUAD)
242 *__va_arg(ap, quad_t *) = nread;
244 *__va_arg(ap, int *) = nread;
249 * We have a conversion that requires input.
255 * Consume leading white space, except for formats
256 * that suppress this.
258 if ((flags & NOSKIP) == 0) {
259 while (isspace(*inp)) {
267 * Note that there is at least one character in
268 * the buffer, so conversions that do not set NOSKIP
269 * can no longer result in an input failure.
279 /* scan arbitrary characters (sets NOSKIP) */
282 if (flags & SUPPRESS) {
285 if ((n = inr) < width) {
301 bcopy(inp, __va_arg(ap, char *), width);
311 /* scan a (nonempty) character class (sets NOSKIP) */
313 width = (size_t)~0; /* `infinity' */
314 /* take only those things in the class */
315 if (flags & SUPPRESS) {
317 while (ccltab[(unsigned char)*inp]) {
330 p0 = p = __va_arg(ap, char *);
331 while (ccltab[(unsigned char)*inp]) {
353 /* like CCL, but zero-length string OK, & no NOSKIP */
356 if (flags & SUPPRESS) {
358 while (!isspace(*inp)) {
367 p0 = p = __va_arg(ap, char *);
368 while (!isspace(*inp)) {
384 /* scan an integer as if by strtoq/strtouq */
386 if (width == 0 || width > sizeof(buf) - 1)
387 width = sizeof(buf) - 1;
389 /* size_t is unsigned, hence this optimisation */
390 if (--width > sizeof(buf) - 2)
391 width = sizeof(buf) - 2;
394 flags |= SIGNOK | NDIGITS | NZDIGITS;
395 for (p = buf; width; width--) {
398 * Switch on the character; `goto ok'
399 * if we accept it as a part of number.
404 * The digit 0 is always legal, but is
405 * special. For %i conversions, if no
406 * digits (zero or nonzero) have been
407 * scanned (only signs), we will have
408 * base==0. In that case, we should set
409 * it to 8 and enable 0x prefixing.
410 * Also, if we have not scanned zero digits
411 * before this, do not turn off prefixing
412 * (someone else will turn it off if we
413 * have scanned any nonzero digits).
420 if (flags & NZDIGITS)
421 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
423 flags &= ~(SIGNOK|PFXOK|NDIGITS);
426 /* 1 through 7 always legal */
427 case '1': case '2': case '3':
428 case '4': case '5': case '6': case '7':
429 base = basefix[base];
430 flags &= ~(SIGNOK | PFXOK | NDIGITS);
433 /* digits 8 and 9 ok iff decimal or hex */
435 base = basefix[base];
437 break; /* not legal here */
438 flags &= ~(SIGNOK | PFXOK | NDIGITS);
441 /* letters ok iff hex */
442 case 'A': case 'B': case 'C':
443 case 'D': case 'E': case 'F':
444 case 'a': case 'b': case 'c':
445 case 'd': case 'e': case 'f':
446 /* no need to fix base here */
448 break; /* not legal here */
449 flags &= ~(SIGNOK | PFXOK | NDIGITS);
452 /* sign ok only as first character */
454 if (flags & SIGNOK) {
460 /* x ok iff flag still set & 2nd char */
462 if (flags & PFXOK && p == buf + 1) {
463 base = 16; /* if %i */
471 * If we got here, c is not a legal character
472 * for a number. Stop accumulating digits.
477 * c is legal: store it and look at the next.
483 break; /* end of input */
486 * If we had only a sign, it is no good; push
487 * back the sign. If the number ends in `x',
488 * it was [sign] '0' 'x', so push back the x
489 * and treat it as [sign] '0'.
491 if (flags & NDIGITS) {
498 c = ((u_char *)p)[-1];
499 if (c == 'x' || c == 'X') {
504 if ((flags & SUPPRESS) == 0) {
508 res = (*ccfn)(buf, NULL, base);
510 *__va_arg(ap, void **) =
511 (void *)(uintptr_t)res;
512 else if (flags & SHORT)
513 *__va_arg(ap, short *) = res;
514 else if (flags & LONG)
515 *__va_arg(ap, long *) = res;
516 else if (flags & QUAD)
517 *__va_arg(ap, quad_t *) = res;
519 *__va_arg(ap, int *) = res;
529 return (nconversions != 0 ? nassigned : -1);
535 * Fill in the given table from the scanset at the given format
536 * (just after `['). Return a pointer to the character past the
537 * closing `]'. The table has a 1 wherever characters should be
538 * considered part of the scanset.
540 static const u_char *
541 __sccl(char *tab, const u_char *fmt)
545 /* first `clear' the whole table */
546 c = *fmt++; /* first char hat => negated scanset */
548 v = 1; /* default => accept */
549 c = *fmt++; /* get new first char */
551 v = 0; /* default => reject */
553 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
554 for (n = 0; n < 256; n++)
555 tab[n] = v; /* memset(tab, v, 256) */
558 return (fmt - 1);/* format ended before closing ] */
561 * Now set the entries corresponding to the actual scanset
562 * to the opposite of the above.
564 * The first character may be ']' (or '-') without being special;
565 * the last character may be '-'.
569 tab[c] = v; /* take character c */
571 n = *fmt++; /* and examine the next */
574 case 0: /* format ended too soon */
579 * A scanset of the form
581 * is defined as `the digit 0, the digit 1,
582 * the character +, the character -', but
583 * the effect of a scanset such as
585 * is implementation defined. The V7 Unix
586 * scanf treats `a-z' as `the letters a through
587 * z', but treats `a-a' as `the letter a, the
588 * character -, and the letter a'.
590 * For compatibility, the `-' is not considerd
591 * to define a range if the character following
592 * it is either a close bracket (required by ANSI)
593 * or is not numerically greater than the character
594 * we just stored in the table (c).
597 if (n == ']' || n < c) {
599 break; /* resume the for(;;) */
602 /* fill in the range */
608 * Alas, the V7 Unix scanf also treats formats
609 * such as [a-c-e] as `the letters a through e'.
610 * This too is permitted by the standard....
615 case ']': /* end of scanset */
618 default: /* just another character */