* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
* This code is derived from software contributed to Berkeley by
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#define BUF 513 /* Maximum length of numeric string. */
* Flags used during conversion.
#define LONG 0x01 /* l: long or double */
#define LONGDBL 0x02 /* L: long double; unimplemented */
#define SHORT 0x04 /* h: short */
#define SUPPRESS 0x08 /* suppress assignment */
#define POINTER 0x10 /* weird %p pointer (`fake hex') */
#define NOSKIP 0x20 /* do not skip blanks */
* The following are used in numeric conversions only:
* SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
* SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
#define SIGNOK 0x40 /* +/- is (still) legal */
#define NDIGITS 0x80 /* no digits detected */
#define DPTOK 0x100 /* (float) decimal point is still legal */
#define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
#define PFXOK 0x100 /* 0x prefix is (still) legal */
#define NZDIGITS 0x200 /* no zero digits detected */
#define CT_CHAR 0 /* %c conversion */
#define CT_CCL 1 /* %[...] conversion */
#define CT_STRING 2 /* %s conversion */
#define CT_INT 3 /* integer, i.e., strtol or strtoul */
#define CT_FLOAT 4 /* floating, i.e., strtod */
#define u_char unsigned char
#define u_long unsigned long
register u_char
*fmt
= (u_char
*)fmt0
;
register int c
; /* character from format, or conversion */
register size_t width
; /* field width, or 0 */
register char *p
; /* points into all kinds of strings */
register int n
; /* handy integer */
register int flags
; /* flags as defined above */
register char *p0
; /* saves original value of p when necessary */
int nassigned
; /* number of fields assigned */
int nread
; /* number of characters consumed from fp */
int base
; /* base argument to strtol/strtoul */
u_long (*ccfn
)(); /* conversion function (strtol/strtoul) */
char ccltab
[256]; /* character class table for %[...] */
char buf
[BUF
]; /* buffer for numeric conversions */
/* `basefix' is used to avoid `if' tests in the integer scanner */
static short basefix
[17] =
{ 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
base
= 0; /* XXX just to keep gcc happy */
ccfn
= NULL
; /* XXX just to keep gcc happy */
if (fp
->_r
<= 0 && __srefill(fp
))
nread
++, fp
->_r
--, fp
->_p
++;
* switch on the format. continue if done;
* break once format type is derived.
if (fp
->_r
<= 0 && __srefill(fp
))
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
width
= width
* 10 + c
- '0';
* Those marked `compat' are for 4.[123]BSD compatibility.
* (According to ANSI, E and X formats are supposed
* to the same as e and x. Sorry about that.)
ccfn
= (u_long (*)())strtol
;
ccfn
= (u_long (*)())strtol
;
case 'X': /* compat XXX */
flags
|= PFXOK
; /* enable 0x prefixing */
case 'E': /* compat XXX */
case 'e': case 'f': case 'g':
fmt
= __sccl(ccltab
, fmt
);
case 'p': /* pointer format is like hex */
flags
|= POINTER
| PFXOK
;
if (flags
& SUPPRESS
) /* ??? */
*va_arg(ap
, short *) = nread
;
*va_arg(ap
, long *) = nread
;
*va_arg(ap
, int *) = nread
;
* Disgusting backwards compatibility hacks. XXX
ccfn
= (u_long (*)())strtol
;
* We have a conversion that requires input.
if (fp
->_r
<= 0 && __srefill(fp
))
* Consume leading white space, except for formats
if ((flags
& NOSKIP
) == 0) {
while (isspace(*fp
->_p
)) {
* Note that there is at least one character in
* the buffer, so conversions that do not set NOSKIP
* ca no longer result in an input failure.
/* scan arbitrary characters (sets NOSKIP) */
if ((n
= fp
->_r
) < width
) {
size_t r
= fread((void *)va_arg(ap
, char *), 1,
/* scan a (nonempty) character class (sets NOSKIP) */
width
= ~0; /* `infinity' */
/* take only those things in the class */
while (ccltab
[*fp
->_p
]) {
if (fp
->_r
<= 0 && __srefill(fp
)) {
p0
= p
= va_arg(ap
, char *);
while (ccltab
[*fp
->_p
]) {
if (fp
->_r
<= 0 && __srefill(fp
)) {
/* like CCL, but zero-length string OK, & no NOSKIP */
while (!isspace(*fp
->_p
)) {
if (fp
->_r
<= 0 && __srefill(fp
))
p0
= p
= va_arg(ap
, char *);
while (!isspace(*fp
->_p
)) {
if (fp
->_r
<= 0 && __srefill(fp
))
/* scan an integer as if by strtol/strtoul */
if (width
== 0 || width
> sizeof(buf
) - 1)
/* size_t is unsigned, hence this optimisation */
if (--width
> sizeof(buf
) - 2)
flags
|= SIGNOK
| NDIGITS
| NZDIGITS
;
for (p
= buf
; width
; width
--) {
* Switch on the character; `goto ok'
* if we accept it as a part of number.
* The digit 0 is always legal, but is
* special. For %i conversions, if no
* digits (zero or nonzero) have been
* scanned (only signs), we will have
* base==0. In that case, we should set
* it to 8 and enable 0x prefixing.
* Also, if we have not scanned zero digits
* before this, do not turn off prefixing
* (someone else will turn it off if we
* have scanned any nonzero digits).
flags
&= ~(SIGNOK
|NZDIGITS
|NDIGITS
);
flags
&= ~(SIGNOK
|PFXOK
|NDIGITS
);
/* 1 through 7 always legal */
case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
flags
&= ~(SIGNOK
| PFXOK
| NDIGITS
);
/* digits 8 and 9 ok iff decimal or hex */
break; /* not legal here */
flags
&= ~(SIGNOK
| PFXOK
| NDIGITS
);
case 'A': case 'B': case 'C':
case 'D': case 'E': case 'F':
case 'a': case 'b': case 'c':
case 'd': case 'e': case 'f':
/* no need to fix base here */
break; /* not legal here */
flags
&= ~(SIGNOK
| PFXOK
| NDIGITS
);
/* sign ok only as first character */
/* x ok iff flag still set & 2nd char */
if (flags
& PFXOK
&& p
== buf
+ 1) {
* If we got here, c is not a legal character
* for a number. Stop accumulating digits.
* c is legal: store it and look at the next.
* If we had only a sign, it is no good; push
* back the sign. If the number ends in `x',
* it was [sign] '0' 'x', so push back the x
* and treat it as [sign] '0'.
(void) ungetc(*(u_char
*)--p
, fp
);
if (c
== 'x' || c
== 'X') {
if ((flags
& SUPPRESS
) == 0) {
res
= (*ccfn
)(buf
, (char **)NULL
, base
);
*va_arg(ap
, void **) = (void *)res
;
*va_arg(ap
, short *) = res
;
*va_arg(ap
, long *) = res
;
*va_arg(ap
, int *) = res
;
/* scan a floating point number as if by strtod */
if (width
== 0 || width
> sizeof(buf
) - 1)
/* size_t is unsigned, hence this optimisation */
if (--width
> sizeof(buf
) - 2)
flags
|= SIGNOK
| NDIGITS
| DPTOK
| EXPOK
;
for (p
= buf
; width
; width
--) {
* This code mimicks the integer conversion
* code, but is much simpler.
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
flags
&= ~(SIGNOK
| NDIGITS
);
flags
&= ~(SIGNOK
| DPTOK
);
/* no exponent without some digits */
if ((flags
&(NDIGITS
|EXPOK
)) == EXPOK
) {
(flags
& ~(EXPOK
|DPTOK
)) |
* If no digits, might be missing exponent digits
* (just give back the exponent) or might be missing
* regular digits, but had sign and/or decimal point.
ungetc(*(u_char
*)--p
, fp
);
/* just a bad exponent (e and maybe sign) */
if (c
!= 'e' && c
!= 'E') {
(void) ungetc(c
, fp
);/* sign */
if ((flags
& SUPPRESS
) == 0) {
res
= strtod(buf
,(char **) NULL
);
*va_arg(ap
, double *) = res
;
*va_arg(ap
, float *) = res
;
#endif /* FLOATING_POINT */
return (nassigned
? nassigned
: -1);
* Fill in the given table from the scanset at the given format
* (just after `['). Return a pointer to the character past the
* closing `]'. The table has a 1 wherever characters should be
* considered part of the scanset.
/* first `clear' the whole table */
c
= *fmt
++; /* first char hat => negated scanset */
v
= 1; /* default => accept */
c
= *fmt
++; /* get new first char */
v
= 0; /* default => reject */
/* should probably use memset here */
for (n
= 0; n
< 256; n
++)
return (fmt
- 1);/* format ended before closing ] */
* Now set the entries corresponding to the actual scanset
* to the opposite of the above.
* The first character may be ']' (or '-') without being special;
* the last character may be '-'.
tab
[c
] = v
; /* take character c */
n
= *fmt
++; /* and examine the next */
case 0: /* format ended too soon */
* is defined as `the digit 0, the digit 1,
* the character +, the character -', but
* the effect of a scanset such as
* is implementation defined. The V7 Unix
* scanf treats `a-z' as `the letters a through
* z', but treats `a-a' as `the letter a, the
* character -, and the letter a'.
* For compatibility, the `-' is not considerd
* to define a range if the character following
* it is either a close bracket (required by ANSI)
* or is not numerically greater than the character
* we just stored in the table (c).
break; /* resume the for(;;) */
do { /* fill in the range */
#if 1 /* XXX another disgusting compatibility hack */
* Alas, the V7 Unix scanf also treats formats
* such as [a-c-e] as `the letters a through e'.
* This too is permitted by the standard....
case ']': /* end of scanset */
default: /* just another character */