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/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 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
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid
[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid
[] =
"$\Id: vfscanf.c,v 1.3.2.2 1997/03/07 09:12:11 joerg Exp $";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <string.h>
#include "collate.h"
#include "local.h"
#define FLOATING_POINT
#include "floatio.h"
#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 */
/*
* Conversion types.
*/
#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
static u_char
*__sccl
(char *, u_char
*);
/*
* vfscanf
*/
int
__svfscanf
(fp
, fmt0
, ap
)
register FILE
*fp
;
char const *fmt0
;
va_list ap
;
{
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 nconversions
; /* number of conversions */
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 };
nassigned
= 0;
nconversions
= 0;
nread
= 0;
base
= 0; /* XXX just to keep gcc happy */
ccfn
= NULL
; /* XXX just to keep gcc happy */
for (;;) {
c
= *fmt
++;
if (c
== 0)
return (nassigned
);
if (isspace(c
)) {
for (;;) {
if (fp
->_r
<= 0 && __srefill
(fp
))
goto input_failure
;
if (!isspace(*fp
->_p
))
break;
nread
++, fp
->_r
--, fp
->_p
++;
}
continue;
}
if (c
!= '%')
goto literal
;
width
= 0;
flags
= 0;
/*
* switch on the format. continue if done;
* break once format type is derived.
*/
again
: c
= *fmt
++;
switch (c
) {
case '%':
literal
:
if (fp
->_r
<= 0 && __srefill
(fp
))
goto input_failure
;
if (*fp
->_p
!= c
)
goto match_failure
;
fp
->_r
--, fp
->_p
++;
nread
++;
continue;
case '*':
flags
|= SUPPRESS
;
goto again
;
case 'l':
flags
|= LONG
;
goto again
;
case 'L':
flags
|= LONGDBL
;
goto again
;
case 'h':
flags
|= SHORT
;
goto again
;
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';
goto again
;
/*
* Conversions.
* 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.)
*/
case 'D': /* compat */
flags
|= LONG
;
/* FALLTHROUGH */
case 'd':
c
= CT_INT
;
ccfn
= (u_long
(*)())strtol;
base
= 10;
break;
case 'i':
c
= CT_INT
;
ccfn
= (u_long
(*)())strtol;
base
= 0;
break;
case 'O': /* compat */
flags
|= LONG
;
/* FALLTHROUGH */
case 'o':
c
= CT_INT
;
ccfn
= strtoul;
base
= 8;
break;
case 'u':
c
= CT_INT
;
ccfn
= strtoul;
base
= 10;
break;
case 'X': /* compat XXX */
flags
|= LONG
;
/* FALLTHROUGH */
case 'x':
flags
|= PFXOK
; /* enable 0x prefixing */
c
= CT_INT
;
ccfn
= strtoul;
base
= 16;
break;
#ifdef FLOATING_POINT
case 'E': /* compat XXX */
case 'F': /* compat */
flags
|= LONG
;
/* FALLTHROUGH */
case 'e': case 'f': case 'g':
c
= CT_FLOAT
;
break;
#endif
case 's':
c
= CT_STRING
;
break;
case '[':
fmt
= __sccl
(ccltab
, fmt
);
flags
|= NOSKIP
;
c
= CT_CCL
;
break;
case 'c':
flags
|= NOSKIP
;
c
= CT_CHAR
;
break;
case 'p': /* pointer format is like hex */
flags
|= POINTER
| PFXOK
;
c
= CT_INT
;
ccfn
= strtoul;
base
= 16;
break;
case 'n':
nconversions
++;
if (flags
& SUPPRESS
) /* ??? */
continue;
if (flags
& SHORT
)
*va_arg(ap
, short *) = nread
;
else if (flags
& LONG
)
*va_arg(ap
, long *) = nread
;
else
*va_arg(ap
, int *) = nread
;
continue;
/*
* Disgusting backwards compatibility hacks. XXX
*/
case '\0': /* compat */
return (EOF
);
default: /* compat */
if (isupper(c
))
flags
|= LONG
;
c
= CT_INT
;
ccfn
= (u_long
(*)())strtol;
base
= 10;
break;
}
/*
* We have a conversion that requires input.
*/
if (fp
->_r
<= 0 && __srefill
(fp
))
goto input_failure
;
/*
* Consume leading white space, except for formats
* that suppress this.
*/
if ((flags
& NOSKIP
) == 0) {
while (isspace(*fp
->_p
)) {
nread
++;
if (--fp
->_r
> 0)
fp
->_p
++;
else if (__srefill
(fp
))
goto input_failure
;
}
/*
* 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.
*/
}
/*
* Do the conversion.
*/
switch (c
) {
case CT_CHAR
:
/* scan arbitrary characters (sets NOSKIP) */
if (width
== 0)
width
= 1;
if (flags
& SUPPRESS
) {
size_t sum
= 0;
for (;;) {
if ((n
= fp
->_r
) < width
) {
sum
+= n
;
width
-= n
;
fp
->_p
+= n
;
if (__srefill
(fp
)) {
if (sum
== 0)
goto input_failure
;
break;
}
} else {
sum
+= width
;
fp
->_r
-= width
;
fp
->_p
+= width
;
break;
}
}
nread
+= sum
;
} else {
size_t r
= fread((void *)va_arg(ap
, char *), 1,
width
, fp
);
if (r
== 0)
goto input_failure
;
nread
+= r
;
nassigned
++;
}
nconversions
++;
break;
case CT_CCL
:
/* scan a (nonempty) character class (sets NOSKIP) */
if (width
== 0)
width
= (size_t)~
0; /* `infinity' */
/* take only those things in the class */
if (flags
& SUPPRESS
) {
n
= 0;
while (ccltab
[*fp
->_p
]) {
n
++, fp
->_r
--, fp
->_p
++;
if (--width
== 0)
break;
if (fp
->_r
<= 0 && __srefill
(fp
)) {
if (n
== 0)
goto input_failure
;
break;
}
}
if (n
== 0)
goto match_failure
;
} else {
p0
= p
= va_arg(ap
, char *);
while (ccltab
[*fp
->_p
]) {
fp
->_r
--;
*p
++ = *fp
->_p
++;
if (--width
== 0)
break;
if (fp
->_r
<= 0 && __srefill
(fp
)) {
if (p
== p0
)
goto input_failure
;
break;
}
}
n
= p
- p0
;
if (n
== 0)
goto match_failure
;
*p
= 0;
nassigned
++;
}
nread
+= n
;
nconversions
++;
break;
case CT_STRING
:
/* like CCL, but zero-length string OK, & no NOSKIP */
if (width
== 0)
width
= (size_t)~
0;
if (flags
& SUPPRESS
) {
n
= 0;
while (!isspace(*fp
->_p
)) {
n
++, fp
->_r
--, fp
->_p
++;
if (--width
== 0)
break;
if (fp
->_r
<= 0 && __srefill
(fp
))
break;
}
nread
+= n
;
} else {
p0
= p
= va_arg(ap
, char *);
while (!isspace(*fp
->_p
)) {
fp
->_r
--;
*p
++ = *fp
->_p
++;
if (--width
== 0)
break;
if (fp
->_r
<= 0 && __srefill
(fp
))
break;
}
*p
= 0;
nread
+= p
- p0
;
nassigned
++;
}
nconversions
++;
continue;
case CT_INT
:
/* scan an integer as if by strtol/strtoul */
#ifdef hardway
if (width
== 0 || width
> sizeof(buf
) - 1)
width
= sizeof(buf
) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width
> sizeof(buf
) - 2)
width
= sizeof(buf
) - 2;
width
++;
#endif
flags
|= SIGNOK
| NDIGITS
| NZDIGITS
;
for (p
= buf
; width
; width
--) {
c
= *fp
->_p
;
/*
* Switch on the character; `goto ok'
* if we accept it as a part of number.
*/
switch (c
) {
/*
* 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).
*/
case '0':
if (base
== 0) {
base
= 8;
flags
|= PFXOK
;
}
if (flags
& NZDIGITS
)
flags
&= ~
(SIGNOK
|NZDIGITS
|NDIGITS
);
else
flags
&= ~
(SIGNOK
|PFXOK
|NDIGITS
);
goto ok
;
/* 1 through 7 always legal */
case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
base
= basefix
[base
];
flags
&= ~
(SIGNOK
| PFXOK
| NDIGITS
);
goto ok
;
/* digits 8 and 9 ok iff decimal or hex */
case '8': case '9':
base
= basefix
[base
];
if (base
<= 8)
break; /* not legal here */
flags
&= ~
(SIGNOK
| PFXOK
| NDIGITS
);
goto ok
;
/* letters ok iff hex */
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 */
if (base
<= 10)
break; /* not legal here */
flags
&= ~
(SIGNOK
| PFXOK
| NDIGITS
);
goto ok
;
/* sign ok only as first character */
case '+': case '-':
if (flags
& SIGNOK
) {
flags
&= ~SIGNOK
;
goto ok
;
}
break;
/* x ok iff flag still set & 2nd char */
case 'x': case 'X':
if (flags
& PFXOK
&& p
== buf
+ 1) {
base
= 16; /* if %i */
flags
&= ~PFXOK
;
goto ok
;
}
break;
}
/*
* If we got here, c is not a legal character
* for a number. Stop accumulating digits.
*/
break;
ok
:
/*
* c is legal: store it and look at the next.
*/
*p
++ = c
;
if (--fp
->_r
> 0)
fp
->_p
++;
else if (__srefill
(fp
))
break; /* EOF */
}
/*
* 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'.
*/
if (flags
& NDIGITS
) {
if (p
> buf
)
(void) ungetc(*(u_char
*)--p
, fp
);
goto match_failure
;
}
c
= ((u_char
*)p
)[-1];
if (c
== 'x' || c
== 'X') {
--p
;
(void) ungetc(c
, fp
);
}
if ((flags
& SUPPRESS
) == 0) {
u_long res
;
*p
= 0;
res
= (*ccfn
)(buf
, (char **)NULL
, base
);
if (flags
& POINTER
)
*va_arg(ap
, void **) = (void *)res
;
else if (flags
& SHORT
)
*va_arg(ap
, short *) = res
;
else if (flags
& LONG
)
*va_arg(ap
, long *) = res
;
else
*va_arg(ap
, int *) = res
;
nassigned
++;
}
nread
+= p
- buf
;
nconversions
++;
break;
#ifdef FLOATING_POINT
case CT_FLOAT
:
/* scan a floating point number as if by strtod */
#ifdef hardway
if (width
== 0 || width
> sizeof(buf
) - 1)
width
= sizeof(buf
) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width
> sizeof(buf
) - 2)
width
= sizeof(buf
) - 2;
width
++;
#endif
flags
|= SIGNOK
| NDIGITS
| DPTOK
| EXPOK
;
for (p
= buf
; width
; width
--) {
c
= *fp
->_p
;
/*
* This code mimicks the integer conversion
* code, but is much simpler.
*/
switch (c
) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9':
flags
&= ~
(SIGNOK
| NDIGITS
);
goto fok
;
case '+': case '-':
if (flags
& SIGNOK
) {
flags
&= ~SIGNOK
;
goto fok
;
}
break;
case '.':
if (flags
& DPTOK
) {
flags
&= ~
(SIGNOK
| DPTOK
);
goto fok
;
}
break;
case 'e': case 'E':
/* no exponent without some digits */
if ((flags
&(NDIGITS
|EXPOK
)) == EXPOK
) {
flags
=
(flags
& ~
(EXPOK
|DPTOK
)) |
SIGNOK
| NDIGITS
;
goto fok
;
}
break;
}
break;
fok
:
*p
++ = c
;
if (--fp
->_r
> 0)
fp
->_p
++;
else if (__srefill
(fp
))
break; /* EOF */
}
/*
* 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.
*/
if (flags
& NDIGITS
) {
if (flags
& EXPOK
) {
/* no digits at all */
while (p
> buf
)
ungetc(*(u_char
*)--p
, fp
);
goto match_failure
;
}
/* just a bad exponent (e and maybe sign) */
c
= *(u_char
*)--p
;
if (c
!= 'e' && c
!= 'E') {
(void) ungetc(c
, fp
);/* sign */
c
= *(u_char
*)--p
;
}
(void) ungetc(c
, fp
);
}
if ((flags
& SUPPRESS
) == 0) {
double res
;
*p
= 0;
res
= strtod(buf
,(char **) NULL
);
if (flags
& LONG
)
*va_arg(ap
, double *) = res
;
else
*va_arg(ap
, float *) = res
;
nassigned
++;
}
nread
+= p
- buf
;
nconversions
++;
break;
#endif /* FLOATING_POINT */
}
}
input_failure
:
return (nconversions
!= 0 ? nassigned
: EOF
);
match_failure
:
return (nassigned
);
}
/*
* 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.
*/
static u_char
*
__sccl
(tab
, fmt
)
register char *tab
;
register u_char
*fmt
;
{
register int c
, n
, v
, i
;
/* first `clear' the whole table */
c
= *fmt
++; /* first char hat => negated scanset */
if (c
== '^') {
v
= 1; /* default => accept */
c
= *fmt
++; /* get new first char */
} else
v
= 0; /* default => reject */
(void) memset(tab
, v
, 256);
if (c
== 0)
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 '-'.
*/
v
= 1 - v
;
for (;;) {
tab
[c
] = v
; /* take character c */
doswitch
:
n
= *fmt
++; /* and examine the next */
switch (n
) {
case 0: /* format ended too soon */
return (fmt
- 1);
case '-':
/*
* A scanset of the form
* [01+-]
* is defined as `the digit 0, the digit 1,
* the character +, the character -', but
* the effect of a scanset such as
* [a-zA-Z0-9]
* 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).
*/
n
= *fmt
;
if (n
== ']' || __collate_range_cmp
(n
, c
) < 0) {
c
= '-';
break; /* resume the for(;;) */
}
fmt
++;
/* fill in the range */
for (i
= 0; i
< 256; i
++)
if ( __collate_range_cmp
(c
, i
) < 0
&& __collate_range_cmp
(i
, n
) <= 0
)
tab
[i
] = v
;
#if 1 /* XXX another disgusting compatibility hack */
c
= n
;
/*
* 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....
*/
goto doswitch
;
#else
c
= *fmt
++;
if (c
== 0)
return (fmt
- 1);
if (c
== ']')
return (fmt
);
#endif
break;
case ']': /* end of scanset */
return (fmt
);
default: /* just another character */
c
= n
;
break;
}
}
/* NOTREACHED */
}