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34 * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/ctype.h>
40 #include <sys/limits.h>
41 #include <sys/stddef.h>
44 * Note that stdarg.h and the ANSI style va_start macro is used for both
45 * ANSI and traditional C compilers.
47 #include <machine/stdarg.h>
49 #define BUF 32 /* Maximum length of numeric string. */
52 * Flags used during conversion.
54 #define LONG 0x01 /* l: long or double */
55 #define SHORT 0x04 /* h: short */
56 #define SUPPRESS 0x08 /* suppress assignment */
57 #define POINTER 0x10 /* weird %p pointer (`fake hex') */
58 #define NOSKIP 0x20 /* do not skip blanks */
60 #define INTMAXT 0x800 /* j: intmax_t */
61 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */
62 #define SIZET 0x2000 /* z: size_t */
63 #define SHORTSHORT 0x4000 /** hh: char */
66 * The following are used in numeric conversions only:
67 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
68 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
70 #define SIGNOK 0x40 /* +/- is (still) legal */
71 #define NDIGITS 0x80 /* no digits detected */
73 #define DPTOK 0x100 /* (float) decimal point is still legal */
74 #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
76 #define PFXOK 0x100 /* 0x prefix is (still) legal */
77 #define NZDIGITS 0x200 /* no zero digits detected */
82 #define CT_CHAR 0 /* %c conversion */
83 #define CT_CCL 1 /* %[...] conversion */
84 #define CT_STRING 2 /* %s conversion */
85 #define CT_INT 3 /* integer, i.e., strtoq or strtouq */
86 typedef u_quad_t (*ccfntype)(const char *, char **, int);
88 static const u_char *__sccl(char *, const u_char *);
91 sscanf(const char *ibuf, const char *fmt, ...)
97 ret = vsscanf(ibuf, fmt, ap);
103 vsscanf(const char *inp, char const *fmt0, va_list ap)
106 const u_char *fmt = (const u_char *)fmt0;
107 int c; /* character from format, or conversion */
108 size_t width; /* field width, or 0 */
109 char *p; /* points into all kinds of strings */
110 int n; /* handy integer */
111 int flags; /* flags as defined above */
112 char *p0; /* saves original value of p when necessary */
113 int nassigned; /* number of fields assigned */
114 int nconversions; /* number of conversions */
115 int nread; /* number of characters consumed from fp */
116 int base; /* base argument to strtoq/strtouq */
117 ccfntype ccfn; /* conversion function (strtoq/strtouq) */
118 char ccltab[256]; /* character class table for %[...] */
119 char buf[BUF]; /* buffer for numeric conversions */
121 /* `basefix' is used to avoid `if' tests in the integer scanner */
122 static short basefix[17] =
123 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
130 base = 0; /* XXX just to keep gcc happy */
131 ccfn = NULL; /* XXX just to keep gcc happy */
137 while (inr > 0 && isspace(*inp))
138 nread++, inr--, inp++;
146 * switch on the format. continue if done;
147 * break once format type is derived.
193 case '0': case '1': case '2': case '3': case '4':
194 case '5': case '6': case '7': case '8': case '9':
195 width = width * 10 + c - '0';
204 ccfn = (ccfntype)strtoq;
210 ccfn = (ccfntype)strtoq;
227 flags |= PFXOK; /* enable 0x prefixing */
238 fmt = __sccl(ccltab, fmt);
248 case 'p': /* pointer format is like hex */
249 flags |= POINTER | PFXOK;
257 if (flags & SUPPRESS) /* ??? */
259 if (flags & SHORTSHORT)
260 *va_arg(ap, char *) = nread;
261 else if (flags & SHORT)
262 *va_arg(ap, short *) = nread;
263 else if (flags & LONG)
264 *va_arg(ap, long *) = nread;
265 else if (flags & QUAD)
266 *va_arg(ap, quad_t *) = nread;
267 else if (flags & INTMAXT)
268 *va_arg(ap, intmax_t *) = nread;
269 else if (flags & SIZET)
270 *va_arg(ap, size_t *) = nread;
271 else if (flags & PTRDIFFT)
272 *va_arg(ap, ptrdiff_t *) = nread;
274 *va_arg(ap, int *) = nread;
279 * We have a conversion that requires input.
285 * Consume leading white space, except for formats
286 * that suppress this.
288 if ((flags & NOSKIP) == 0) {
289 while (isspace(*inp)) {
297 * Note that there is at least one character in
298 * the buffer, so conversions that do not set NOSKIP
299 * can no longer result in an input failure.
308 /* scan arbitrary characters (sets NOSKIP) */
311 if (flags & SUPPRESS) {
314 if ((n = inr) < width) {
330 bcopy(inp, va_arg(ap, char *), width);
340 /* scan a (nonempty) character class (sets NOSKIP) */
342 width = (size_t)~0; /* `infinity' */
343 /* take only those things in the class */
344 if (flags & SUPPRESS) {
346 while (ccltab[(unsigned char)*inp]) {
359 p0 = p = va_arg(ap, char *);
360 while (ccltab[(unsigned char)*inp]) {
382 /* like CCL, but zero-length string OK, & no NOSKIP */
385 if (flags & SUPPRESS) {
387 while (!isspace(*inp)) {
396 p0 = p = va_arg(ap, char *);
397 while (!isspace(*inp)) {
413 /* scan an integer as if by strtoq/strtouq */
415 if (width == 0 || width > sizeof(buf) - 1)
416 width = sizeof(buf) - 1;
418 /* size_t is unsigned, hence this optimisation */
419 if (--width > sizeof(buf) - 2)
420 width = sizeof(buf) - 2;
423 flags |= SIGNOK | NDIGITS | NZDIGITS;
424 for (p = buf; width; width--) {
427 * Switch on the character; `goto ok'
428 * if we accept it as a part of number.
432 * The digit 0 is always legal, but is
433 * special. For %i conversions, if no
434 * digits (zero or nonzero) have been
435 * scanned (only signs), we will have
436 * base==0. In that case, we should set
437 * it to 8 and enable 0x prefixing.
438 * Also, if we have not scanned zero digits
439 * before this, do not turn off prefixing
440 * (someone else will turn it off if we
441 * have scanned any nonzero digits).
448 if (flags & NZDIGITS)
449 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
451 flags &= ~(SIGNOK|PFXOK|NDIGITS);
454 /* 1 through 7 always legal */
455 case '1': case '2': case '3':
456 case '4': case '5': case '6': case '7':
457 base = basefix[base];
458 flags &= ~(SIGNOK | PFXOK | NDIGITS);
461 /* digits 8 and 9 ok iff decimal or hex */
463 base = basefix[base];
465 break; /* not legal here */
466 flags &= ~(SIGNOK | PFXOK | NDIGITS);
469 /* letters ok iff hex */
470 case 'A': case 'B': case 'C':
471 case 'D': case 'E': case 'F':
472 case 'a': case 'b': case 'c':
473 case 'd': case 'e': case 'f':
474 /* no need to fix base here */
476 break; /* not legal here */
477 flags &= ~(SIGNOK | PFXOK | NDIGITS);
480 /* sign ok only as first character */
482 if (flags & SIGNOK) {
488 /* x ok iff flag still set & 2nd char */
490 if (flags & PFXOK && p == buf + 1) {
491 base = 16; /* if %i */
499 * If we got here, c is not a legal character
500 * for a number. Stop accumulating digits.
505 * c is legal: store it and look at the next.
511 break; /* end of input */
514 * If we had only a sign, it is no good; push
515 * back the sign. If the number ends in `x',
516 * it was [sign] '0' 'x', so push back the x
517 * and treat it as [sign] '0'.
519 if (flags & NDIGITS) {
526 c = ((u_char *)p)[-1];
527 if (c == 'x' || c == 'X') {
532 if ((flags & SUPPRESS) == 0) {
536 res = (*ccfn)(buf, (char **)NULL, base);
538 *va_arg(ap, void **) =
539 (void *)(uintptr_t)res;
540 else if (flags & SHORTSHORT)
541 *va_arg(ap, char *) = res;
542 else if (flags & SHORT)
543 *va_arg(ap, short *) = res;
544 else if (flags & LONG)
545 *va_arg(ap, long *) = res;
546 else if (flags & QUAD)
547 *va_arg(ap, quad_t *) = res;
548 else if (flags & INTMAXT)
549 *va_arg(ap, intmax_t *) = res;
550 else if (flags & PTRDIFFT)
551 *va_arg(ap, ptrdiff_t *) = res;
552 else if (flags & SIZET)
553 *va_arg(ap, size_t *) = res;
555 *va_arg(ap, int *) = res;
564 return (nconversions != 0 ? nassigned : -1);
570 * Fill in the given table from the scanset at the given format
571 * (just after `['). Return a pointer to the character past the
572 * closing `]'. The table has a 1 wherever characters should be
573 * considered part of the scanset.
575 static const u_char *
576 __sccl(char *tab, const u_char *fmt)
580 /* first `clear' the whole table */
581 c = *fmt++; /* first char hat => negated scanset */
583 v = 1; /* default => accept */
584 c = *fmt++; /* get new first char */
586 v = 0; /* default => reject */
588 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
589 for (n = 0; n < 256; n++)
590 tab[n] = v; /* memset(tab, v, 256) */
593 return (fmt - 1);/* format ended before closing ] */
596 * Now set the entries corresponding to the actual scanset
597 * to the opposite of the above.
599 * The first character may be ']' (or '-') without being special;
600 * the last character may be '-'.
604 tab[c] = v; /* take character c */
606 n = *fmt++; /* and examine the next */
608 case 0: /* format ended too soon */
613 * A scanset of the form
615 * is defined as `the digit 0, the digit 1,
616 * the character +, the character -', but
617 * the effect of a scanset such as
619 * is implementation defined. The V7 Unix
620 * scanf treats `a-z' as `the letters a through
621 * z', but treats `a-a' as `the letter a, the
622 * character -, and the letter a'.
624 * For compatibility, the `-' is not considered
625 * to define a range if the character following
626 * it is either a close bracket (required by ANSI)
627 * or is not numerically greater than the character
628 * we just stored in the table (c).
631 if (n == ']' || n < c) {
633 break; /* resume the for(;;) */
636 /* fill in the range */
642 * Alas, the V7 Unix scanf also treats formats
643 * such as [a-c-e] as `the letters a through e'.
644 * This too is permitted by the standard....
649 case ']': /* end of scanset */
652 default: /* just another character */