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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20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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32 * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp
33 * From: static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93";
34 * From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/ctype.h>
43 #include <sys/limits.h>
46 * Note that stdarg.h and the ANSI style va_start macro is used for both
47 * ANSI and traditional C compilers.
49 #include <machine/stdarg.h>
51 #define BUF 32 /* Maximum length of numeric string. */
54 * Flags used during conversion.
56 #define LONG 0x01 /* l: long or double */
57 #define SHORT 0x04 /* h: short */
58 #define SUPPRESS 0x08 /* suppress assignment */
59 #define POINTER 0x10 /* weird %p pointer (`fake hex') */
60 #define NOSKIP 0x20 /* do not skip blanks */
64 * The following are used in numeric conversions only:
65 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
66 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
68 #define SIGNOK 0x40 /* +/- is (still) legal */
69 #define NDIGITS 0x80 /* no digits detected */
71 #define DPTOK 0x100 /* (float) decimal point is still legal */
72 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
74 #define PFXOK 0x100 /* 0x prefix is (still) legal */
75 #define NZDIGITS 0x200 /* no zero digits detected */
80 #define CT_CHAR 0 /* %c conversion */
81 #define CT_CCL 1 /* %[...] conversion */
82 #define CT_STRING 2 /* %s conversion */
83 #define CT_INT 3 /* integer, i.e., strtoq or strtouq */
84 typedef u_quad_t (*ccfntype)(const char *, char **, int);
86 static const u_char *__sccl(char *, const u_char *);
89 sscanf(const char *ibuf, const char *fmt, ...)
95 ret = vsscanf(ibuf, fmt, ap);
101 vsscanf(const char *inp, char const *fmt0, va_list ap)
104 const u_char *fmt = (const u_char *)fmt0;
105 int c; /* character from format, or conversion */
106 size_t width; /* field width, or 0 */
107 char *p; /* points into all kinds of strings */
108 int n; /* handy integer */
109 int flags; /* flags as defined above */
110 char *p0; /* saves original value of p when necessary */
111 int nassigned; /* number of fields assigned */
112 int nconversions; /* number of conversions */
113 int nread; /* number of characters consumed from fp */
114 int base; /* base argument to strtoq/strtouq */
115 ccfntype ccfn; /* conversion function (strtoq/strtouq) */
116 char ccltab[256]; /* character class table for %[...] */
117 char buf[BUF]; /* buffer for numeric conversions */
119 /* `basefix' is used to avoid `if' tests in the integer scanner */
120 static short basefix[17] =
121 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
128 base = 0; /* XXX just to keep gcc happy */
129 ccfn = NULL; /* XXX just to keep gcc happy */
135 while (inr > 0 && isspace(*inp))
136 nread++, inr--, inp++;
144 * switch on the format. continue if done;
145 * break once format type is derived.
172 case '0': case '1': case '2': case '3': case '4':
173 case '5': case '6': case '7': case '8': case '9':
174 width = width * 10 + c - '0';
183 ccfn = (ccfntype)strtoq;
189 ccfn = (ccfntype)strtoq;
206 flags |= PFXOK; /* enable 0x prefixing */
217 fmt = __sccl(ccltab, fmt);
227 case 'p': /* pointer format is like hex */
228 flags |= POINTER | PFXOK;
236 if (flags & SUPPRESS) /* ??? */
239 *va_arg(ap, short *) = nread;
240 else if (flags & LONG)
241 *va_arg(ap, long *) = nread;
242 else if (flags & QUAD)
243 *va_arg(ap, quad_t *) = nread;
245 *va_arg(ap, int *) = nread;
250 * We have a conversion that requires input.
256 * Consume leading white space, except for formats
257 * that suppress this.
259 if ((flags & NOSKIP) == 0) {
260 while (isspace(*inp)) {
268 * Note that there is at least one character in
269 * the buffer, so conversions that do not set NOSKIP
270 * can no longer result in an input failure.
280 /* scan arbitrary characters (sets NOSKIP) */
283 if (flags & SUPPRESS) {
286 if ((n = inr) < width) {
302 bcopy(inp, va_arg(ap, char *), width);
312 /* scan a (nonempty) character class (sets NOSKIP) */
314 width = (size_t)~0; /* `infinity' */
315 /* take only those things in the class */
316 if (flags & SUPPRESS) {
318 while (ccltab[(unsigned char)*inp]) {
331 p0 = p = va_arg(ap, char *);
332 while (ccltab[(unsigned char)*inp]) {
354 /* like CCL, but zero-length string OK, & no NOSKIP */
357 if (flags & SUPPRESS) {
359 while (!isspace(*inp)) {
368 p0 = p = va_arg(ap, char *);
369 while (!isspace(*inp)) {
385 /* scan an integer as if by strtoq/strtouq */
387 if (width == 0 || width > sizeof(buf) - 1)
388 width = sizeof(buf) - 1;
390 /* size_t is unsigned, hence this optimisation */
391 if (--width > sizeof(buf) - 2)
392 width = sizeof(buf) - 2;
395 flags |= SIGNOK | NDIGITS | NZDIGITS;
396 for (p = buf; width; width--) {
399 * Switch on the character; `goto ok'
400 * if we accept it as a part of number.
405 * The digit 0 is always legal, but is
406 * special. For %i conversions, if no
407 * digits (zero or nonzero) have been
408 * scanned (only signs), we will have
409 * base==0. In that case, we should set
410 * it to 8 and enable 0x prefixing.
411 * Also, if we have not scanned zero digits
412 * before this, do not turn off prefixing
413 * (someone else will turn it off if we
414 * have scanned any nonzero digits).
421 if (flags & NZDIGITS)
422 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
424 flags &= ~(SIGNOK|PFXOK|NDIGITS);
427 /* 1 through 7 always legal */
428 case '1': case '2': case '3':
429 case '4': case '5': case '6': case '7':
430 base = basefix[base];
431 flags &= ~(SIGNOK | PFXOK | NDIGITS);
434 /* digits 8 and 9 ok iff decimal or hex */
436 base = basefix[base];
438 break; /* not legal here */
439 flags &= ~(SIGNOK | PFXOK | NDIGITS);
442 /* letters ok iff hex */
443 case 'A': case 'B': case 'C':
444 case 'D': case 'E': case 'F':
445 case 'a': case 'b': case 'c':
446 case 'd': case 'e': case 'f':
447 /* no need to fix base here */
449 break; /* not legal here */
450 flags &= ~(SIGNOK | PFXOK | NDIGITS);
453 /* sign ok only as first character */
455 if (flags & SIGNOK) {
461 /* x ok iff flag still set & 2nd char */
463 if (flags & PFXOK && p == buf + 1) {
464 base = 16; /* if %i */
472 * If we got here, c is not a legal character
473 * for a number. Stop accumulating digits.
478 * c is legal: store it and look at the next.
484 break; /* end of input */
487 * If we had only a sign, it is no good; push
488 * back the sign. If the number ends in `x',
489 * it was [sign] '0' 'x', so push back the x
490 * and treat it as [sign] '0'.
492 if (flags & NDIGITS) {
499 c = ((u_char *)p)[-1];
500 if (c == 'x' || c == 'X') {
505 if ((flags & SUPPRESS) == 0) {
509 res = (*ccfn)(buf, (char **)NULL, base);
511 *va_arg(ap, void **) =
512 (void *)(uintptr_t)res;
513 else if (flags & SHORT)
514 *va_arg(ap, short *) = res;
515 else if (flags & LONG)
516 *va_arg(ap, long *) = res;
517 else if (flags & QUAD)
518 *va_arg(ap, quad_t *) = res;
520 *va_arg(ap, int *) = res;
530 return (nconversions != 0 ? nassigned : -1);
536 * Fill in the given table from the scanset at the given format
537 * (just after `['). Return a pointer to the character past the
538 * closing `]'. The table has a 1 wherever characters should be
539 * considered part of the scanset.
541 static const u_char *
542 __sccl(char *tab, const u_char *fmt)
546 /* first `clear' the whole table */
547 c = *fmt++; /* first char hat => negated scanset */
549 v = 1; /* default => accept */
550 c = *fmt++; /* get new first char */
552 v = 0; /* default => reject */
554 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
555 for (n = 0; n < 256; n++)
556 tab[n] = v; /* memset(tab, v, 256) */
559 return (fmt - 1);/* format ended before closing ] */
562 * Now set the entries corresponding to the actual scanset
563 * to the opposite of the above.
565 * The first character may be ']' (or '-') without being special;
566 * the last character may be '-'.
570 tab[c] = v; /* take character c */
572 n = *fmt++; /* and examine the next */
575 case 0: /* format ended too soon */
580 * A scanset of the form
582 * is defined as `the digit 0, the digit 1,
583 * the character +, the character -', but
584 * the effect of a scanset such as
586 * is implementation defined. The V7 Unix
587 * scanf treats `a-z' as `the letters a through
588 * z', but treats `a-a' as `the letter a, the
589 * character -, and the letter a'.
591 * For compatibility, the `-' is not considerd
592 * to define a range if the character following
593 * it is either a close bracket (required by ANSI)
594 * or is not numerically greater than the character
595 * we just stored in the table (c).
598 if (n == ']' || n < c) {
600 break; /* resume the for(;;) */
603 /* fill in the range */
609 * Alas, the V7 Unix scanf also treats formats
610 * such as [a-c-e] as `the letters a through e'.
611 * This too is permitted by the standard....
616 case ']': /* end of scanset */
619 default: /* just another character */