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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/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/ctype.h>
45 #include <sys/limits.h>
48 * Note that stdarg.h and the ANSI style va_start macro is used for both
49 * ANSI and traditional C compilers.
51 #include <machine/stdarg.h>
53 #define BUF 32 /* Maximum length of numeric string. */
56 * Flags used during conversion.
58 #define LONG 0x01 /* l: long or double */
59 #define SHORT 0x04 /* h: short */
60 #define SUPPRESS 0x08 /* suppress assignment */
61 #define POINTER 0x10 /* weird %p pointer (`fake hex') */
62 #define NOSKIP 0x20 /* do not skip blanks */
64 #define SHORTSHORT 0x4000 /** hh: char */
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.
185 case '0': case '1': case '2': case '3': case '4':
186 case '5': case '6': case '7': case '8': case '9':
187 width = width * 10 + c - '0';
196 ccfn = (ccfntype)strtoq;
202 ccfn = (ccfntype)strtoq;
219 flags |= PFXOK; /* enable 0x prefixing */
230 fmt = __sccl(ccltab, fmt);
240 case 'p': /* pointer format is like hex */
241 flags |= POINTER | PFXOK;
249 if (flags & SUPPRESS) /* ??? */
251 if (flags & SHORTSHORT)
252 *va_arg(ap, char *) = nread;
253 else if (flags & SHORT)
254 *va_arg(ap, short *) = nread;
255 else if (flags & LONG)
256 *va_arg(ap, long *) = nread;
257 else if (flags & QUAD)
258 *va_arg(ap, quad_t *) = nread;
260 *va_arg(ap, int *) = nread;
265 * We have a conversion that requires input.
271 * Consume leading white space, except for formats
272 * that suppress this.
274 if ((flags & NOSKIP) == 0) {
275 while (isspace(*inp)) {
283 * Note that there is at least one character in
284 * the buffer, so conversions that do not set NOSKIP
285 * can no longer result in an input failure.
295 /* scan arbitrary characters (sets NOSKIP) */
298 if (flags & SUPPRESS) {
301 if ((n = inr) < width) {
317 bcopy(inp, va_arg(ap, char *), width);
327 /* scan a (nonempty) character class (sets NOSKIP) */
329 width = (size_t)~0; /* `infinity' */
330 /* take only those things in the class */
331 if (flags & SUPPRESS) {
333 while (ccltab[(unsigned char)*inp]) {
346 p0 = p = va_arg(ap, char *);
347 while (ccltab[(unsigned char)*inp]) {
369 /* like CCL, but zero-length string OK, & no NOSKIP */
372 if (flags & SUPPRESS) {
374 while (!isspace(*inp)) {
383 p0 = p = va_arg(ap, char *);
384 while (!isspace(*inp)) {
400 /* scan an integer as if by strtoq/strtouq */
402 if (width == 0 || width > sizeof(buf) - 1)
403 width = sizeof(buf) - 1;
405 /* size_t is unsigned, hence this optimisation */
406 if (--width > sizeof(buf) - 2)
407 width = sizeof(buf) - 2;
410 flags |= SIGNOK | NDIGITS | NZDIGITS;
411 for (p = buf; width; width--) {
414 * Switch on the character; `goto ok'
415 * if we accept it as a part of number.
420 * The digit 0 is always legal, but is
421 * special. For %i conversions, if no
422 * digits (zero or nonzero) have been
423 * scanned (only signs), we will have
424 * base==0. In that case, we should set
425 * it to 8 and enable 0x prefixing.
426 * Also, if we have not scanned zero digits
427 * before this, do not turn off prefixing
428 * (someone else will turn it off if we
429 * have scanned any nonzero digits).
436 if (flags & NZDIGITS)
437 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
439 flags &= ~(SIGNOK|PFXOK|NDIGITS);
442 /* 1 through 7 always legal */
443 case '1': case '2': case '3':
444 case '4': case '5': case '6': case '7':
445 base = basefix[base];
446 flags &= ~(SIGNOK | PFXOK | NDIGITS);
449 /* digits 8 and 9 ok iff decimal or hex */
451 base = basefix[base];
453 break; /* not legal here */
454 flags &= ~(SIGNOK | PFXOK | NDIGITS);
457 /* letters ok iff hex */
458 case 'A': case 'B': case 'C':
459 case 'D': case 'E': case 'F':
460 case 'a': case 'b': case 'c':
461 case 'd': case 'e': case 'f':
462 /* no need to fix base here */
464 break; /* not legal here */
465 flags &= ~(SIGNOK | PFXOK | NDIGITS);
468 /* sign ok only as first character */
470 if (flags & SIGNOK) {
476 /* x ok iff flag still set & 2nd char */
478 if (flags & PFXOK && p == buf + 1) {
479 base = 16; /* if %i */
487 * If we got here, c is not a legal character
488 * for a number. Stop accumulating digits.
493 * c is legal: store it and look at the next.
499 break; /* end of input */
502 * If we had only a sign, it is no good; push
503 * back the sign. If the number ends in `x',
504 * it was [sign] '0' 'x', so push back the x
505 * and treat it as [sign] '0'.
507 if (flags & NDIGITS) {
514 c = ((u_char *)p)[-1];
515 if (c == 'x' || c == 'X') {
520 if ((flags & SUPPRESS) == 0) {
524 res = (*ccfn)(buf, (char **)NULL, base);
526 *va_arg(ap, void **) =
527 (void *)(uintptr_t)res;
528 else if (flags & SHORTSHORT)
529 *va_arg(ap, char *) = res;
530 else if (flags & SHORT)
531 *va_arg(ap, short *) = res;
532 else if (flags & LONG)
533 *va_arg(ap, long *) = res;
534 else if (flags & QUAD)
535 *va_arg(ap, quad_t *) = res;
537 *va_arg(ap, int *) = res;
547 return (nconversions != 0 ? nassigned : -1);
553 * Fill in the given table from the scanset at the given format
554 * (just after `['). Return a pointer to the character past the
555 * closing `]'. The table has a 1 wherever characters should be
556 * considered part of the scanset.
558 static const u_char *
559 __sccl(char *tab, const u_char *fmt)
563 /* first `clear' the whole table */
564 c = *fmt++; /* first char hat => negated scanset */
566 v = 1; /* default => accept */
567 c = *fmt++; /* get new first char */
569 v = 0; /* default => reject */
571 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
572 for (n = 0; n < 256; n++)
573 tab[n] = v; /* memset(tab, v, 256) */
576 return (fmt - 1);/* format ended before closing ] */
579 * Now set the entries corresponding to the actual scanset
580 * to the opposite of the above.
582 * The first character may be ']' (or '-') without being special;
583 * the last character may be '-'.
587 tab[c] = v; /* take character c */
589 n = *fmt++; /* and examine the next */
592 case 0: /* format ended too soon */
597 * A scanset of the form
599 * is defined as `the digit 0, the digit 1,
600 * the character +, the character -', but
601 * the effect of a scanset such as
603 * is implementation defined. The V7 Unix
604 * scanf treats `a-z' as `the letters a through
605 * z', but treats `a-a' as `the letter a, the
606 * character -, and the letter a'.
608 * For compatibility, the `-' is not considered
609 * to define a range if the character following
610 * it is either a close bracket (required by ANSI)
611 * or is not numerically greater than the character
612 * we just stored in the table (c).
615 if (n == ']' || n < c) {
617 break; /* resume the for(;;) */
620 /* fill in the range */
626 * Alas, the V7 Unix scanf also treats formats
627 * such as [a-c-e] as `the letters a through e'.
628 * This too is permitted by the standard....
633 case ']': /* end of scanset */
636 default: /* just another character */