freebsd-dev/lib/libc/stdio/vfwscanf.c
Ed Maste 1d8053c5c0 Renumber clauses to reduce diffs to other versions
NetBSD, OpenBSD, and Android's Bionic all number the clauses 1 through 3,
so follow suit to make comparison easier.

Acked-by: imp@
2013-04-23 13:33:13 +00:00

949 lines
21 KiB
C

/*-
* 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.
*
* Copyright (c) 2011 The FreeBSD Foundation
* All rights reserved.
* Portions of this software were developed by David Chisnall
* under sponsorship from the FreeBSD Foundation.
*
* 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. 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 0
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
#include "xlocale_private.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 */
#define SHORT 0x04 /* h: short */
#define SUPPRESS 0x08 /* *: suppress assignment */
#define POINTER 0x10 /* p: void * (as hex) */
#define NOSKIP 0x20 /* [ or c: do not skip blanks */
#define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */
#define INTMAXT 0x800 /* j: intmax_t */
#define PTRDIFFT 0x1000 /* t: ptrdiff_t */
#define SIZET 0x2000 /* z: size_t */
#define SHORTSHORT 0x4000 /* hh: char */
#define UNSIGNED 0x8000 /* %[oupxX] conversions */
/*
* The following are used in integral conversions only:
* SIGNOK, NDIGITS, PFXOK, and NZDIGITS
*/
#define SIGNOK 0x40 /* +/- is (still) legal */
#define NDIGITS 0x80 /* no digits detected */
#define PFXOK 0x100 /* 0x prefix is (still) legal */
#define NZDIGITS 0x200 /* no zero digits detected */
#define HAVESIGN 0x10000 /* sign detected */
/*
* Conversion types.
*/
#define CT_CHAR 0 /* %c conversion */
#define CT_CCL 1 /* %[...] conversion */
#define CT_STRING 2 /* %s conversion */
#define CT_INT 3 /* %[dioupxX] conversion */
#define CT_FLOAT 4 /* %[efgEFG] conversion */
#ifndef NO_FLOATING_POINT
static int parsefloat(FILE *, wchar_t *, wchar_t *, locale_t);
#endif
struct ccl {
const wchar_t *start; /* character class start */
const wchar_t *end; /* character class end */
int compl; /* ccl is complemented? */
};
static __inline int
inccl(const struct ccl *ccl, wint_t wi)
{
if (ccl->compl) {
return (wmemchr(ccl->start, wi, ccl->end - ccl->start)
== NULL);
} else {
return (wmemchr(ccl->start, wi, ccl->end - ccl->start) != NULL);
}
}
/*
* Conversion functions are passed a pointer to this object instead of
* a real parameter to indicate that the assignment-suppression (*)
* flag was specified. We could use a NULL pointer to indicate this,
* but that would mask bugs in applications that call scanf() with a
* NULL pointer.
*/
static const int suppress;
#define SUPPRESS_PTR ((void *)&suppress)
static const mbstate_t initial_mbs;
/*
* The following conversion functions return the number of characters consumed,
* or -1 on input failure. Character class conversion returns 0 on match
* failure.
*/
static __inline int
convert_char(FILE *fp, char * mbp, int width, locale_t locale)
{
mbstate_t mbs;
size_t nconv;
wint_t wi;
int n;
n = 0;
mbs = initial_mbs;
while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
if (mbp != SUPPRESS_PTR) {
nconv = wcrtomb(mbp, wi, &mbs);
if (nconv == (size_t)-1)
return (-1);
mbp += nconv;
}
n++;
}
if (n == 0)
return (-1);
return (n);
}
static __inline int
convert_wchar(FILE *fp, wchar_t *wcp, int width, locale_t locale)
{
wint_t wi;
int n;
n = 0;
while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
if (wcp != SUPPRESS_PTR)
*wcp++ = (wchar_t)wi;
n++;
}
if (n == 0)
return (-1);
return (n);
}
static __inline int
convert_ccl(FILE *fp, char * mbp, int width, const struct ccl *ccl,
locale_t locale)
{
mbstate_t mbs;
size_t nconv;
wint_t wi;
int n;
n = 0;
mbs = initial_mbs;
while ((wi = __fgetwc(fp, locale)) != WEOF &&
width-- != 0 && inccl(ccl, wi)) {
if (mbp != SUPPRESS_PTR) {
nconv = wcrtomb(mbp, wi, &mbs);
if (nconv == (size_t)-1)
return (-1);
mbp += nconv;
}
n++;
}
if (wi != WEOF)
__ungetwc(wi, fp, locale);
if (mbp != SUPPRESS_PTR)
*mbp = 0;
return (n);
}
static __inline int
convert_wccl(FILE *fp, wchar_t *wcp, int width, const struct ccl *ccl,
locale_t locale)
{
wchar_t *wcp0;
wint_t wi;
int n;
if (wcp == SUPPRESS_PTR) {
n = 0;
while ((wi = __fgetwc(fp, locale)) != WEOF &&
width-- != 0 && inccl(ccl, wi))
n++;
if (wi != WEOF)
__ungetwc(wi, fp, locale);
} else {
wcp0 = wcp;
while ((wi = __fgetwc(fp, locale)) != WEOF &&
width-- != 0 && inccl(ccl, wi))
*wcp++ = (wchar_t)wi;
if (wi != WEOF)
__ungetwc(wi, fp, locale);
n = wcp - wcp0;
if (n == 0)
return (0);
*wcp = 0;
}
return (n);
}
static __inline int
convert_string(FILE *fp, char * mbp, int width, locale_t locale)
{
mbstate_t mbs;
size_t nconv;
wint_t wi;
int nread;
mbs = initial_mbs;
nread = 0;
while ((wi = __fgetwc(fp, locale)) != WEOF && width-- != 0 &&
!iswspace(wi)) {
if (mbp != SUPPRESS_PTR) {
nconv = wcrtomb(mbp, wi, &mbs);
if (nconv == (size_t)-1)
return (-1);
mbp += nconv;
}
nread++;
}
if (wi != WEOF)
__ungetwc(wi, fp, locale);
if (mbp != SUPPRESS_PTR)
*mbp = 0;
return (nread);
}
static __inline int
convert_wstring(FILE *fp, wchar_t *wcp, int width, locale_t locale)
{
wchar_t *wcp0;
wint_t wi;
int nread;
nread = 0;
if (wcp == SUPPRESS_PTR) {
while ((wi = __fgetwc(fp, locale)) != WEOF &&
width-- != 0 && !iswspace(wi))
nread++;
if (wi != WEOF)
__ungetwc(wi, fp, locale);
} else {
wcp0 = wcp;
while ((wi = __fgetwc(fp, locale)) != WEOF &&
width-- != 0 && !iswspace(wi)) {
*wcp++ = (wchar_t)wi;
nread++;
}
if (wi != WEOF)
__ungetwc(wi, fp, locale);
*wcp = '\0';
}
return (nread);
}
/*
* Read an integer, storing it in buf. The only relevant bit in the
* flags argument is PFXOK.
*
* Return 0 on a match failure, and the number of characters read
* otherwise.
*/
static __inline int
parseint(FILE *fp, wchar_t *buf, int width, int base, int flags,
locale_t locale)
{
/* `basefix' is used to avoid `if' tests */
static const short basefix[17] =
{ 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
wchar_t *wcp;
int c;
flags |= SIGNOK | NDIGITS | NZDIGITS;
for (wcp = buf; width; width--) {
c = __fgetwc(fp, locale);
/*
* 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;
flags |= HAVESIGN;
goto ok;
}
break;
/*
* x ok iff flag still set & 2nd char (or 3rd char if
* we have a sign).
*/
case 'x': case 'X':
if (flags & PFXOK && wcp ==
buf + 1 + !!(flags & HAVESIGN)) {
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.
*/
if (c != WEOF)
__ungetwc(c, fp, locale);
break;
ok:
/*
* c is legal: store it and look at the next.
*/
*wcp++ = (wchar_t)c;
}
/*
* 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 (wcp > buf)
__ungetwc(*--wcp, fp, locale);
return (0);
}
c = wcp[-1];
if (c == 'x' || c == 'X') {
--wcp;
__ungetwc(c, fp, locale);
}
return (wcp - buf);
}
/*
* MT-safe version.
*/
int
vfwscanf_l(FILE * __restrict fp, locale_t locale,
const wchar_t * __restrict fmt, va_list ap)
{
int ret;
FIX_LOCALE(locale);
FLOCKFILE(fp);
ORIENT(fp, 1);
ret = __vfwscanf(fp, locale, fmt, ap);
FUNLOCKFILE(fp);
return (ret);
}
int
vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
{
return vfwscanf_l(fp, __get_locale(), fmt, ap);
}
/*
* Non-MT-safe version.
*/
int
__vfwscanf(FILE * __restrict fp, locale_t locale,
const wchar_t * __restrict fmt, va_list ap)
{
#define GETARG(type) ((flags & SUPPRESS) ? SUPPRESS_PTR : va_arg(ap, type))
wint_t c; /* character from format, or conversion */
size_t width; /* field width, or 0 */
int flags; /* flags as defined above */
int nassigned; /* number of fields assigned */
int nconversions; /* number of conversions */
int nr; /* characters read by the current conversion */
int nread; /* number of characters consumed from fp */
int base; /* base argument to conversion function */
struct ccl ccl; /* character class info */
wchar_t buf[BUF]; /* buffer for numeric conversions */
wint_t wi; /* handy wint_t */
nassigned = 0;
nconversions = 0;
nread = 0;
ccl.start = ccl.end = NULL;
for (;;) {
c = *fmt++;
if (c == 0)
return (nassigned);
if (iswspace(c)) {
while ((c = __fgetwc(fp, locale)) != WEOF &&
iswspace_l(c, locale))
nread++;
if (c != WEOF)
__ungetwc(c, fp, locale);
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 ((wi = __fgetwc(fp, locale)) == WEOF)
goto input_failure;
if (wi != c) {
__ungetwc(wi, fp, locale);
goto input_failure;
}
nread++;
continue;
case '*':
flags |= SUPPRESS;
goto again;
case 'j':
flags |= INTMAXT;
goto again;
case 'l':
if (flags & LONG) {
flags &= ~LONG;
flags |= LONGLONG;
} else
flags |= LONG;
goto again;
case 'q':
flags |= LONGLONG; /* not quite */
goto again;
case 't':
flags |= PTRDIFFT;
goto again;
case 'z':
flags |= SIZET;
goto again;
case 'L':
flags |= LONGDBL;
goto again;
case 'h':
if (flags & SHORT) {
flags &= ~SHORT;
flags |= SHORTSHORT;
} else
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.
*/
case 'd':
c = CT_INT;
base = 10;
break;
case 'i':
c = CT_INT;
base = 0;
break;
case 'o':
c = CT_INT;
flags |= UNSIGNED;
base = 8;
break;
case 'u':
c = CT_INT;
flags |= UNSIGNED;
base = 10;
break;
case 'X':
case 'x':
flags |= PFXOK; /* enable 0x prefixing */
c = CT_INT;
flags |= UNSIGNED;
base = 16;
break;
#ifndef NO_FLOATING_POINT
case 'A': case 'E': case 'F': case 'G':
case 'a': case 'e': case 'f': case 'g':
c = CT_FLOAT;
break;
#endif
case 'S':
flags |= LONG;
/* FALLTHROUGH */
case 's':
c = CT_STRING;
break;
case '[':
ccl.start = fmt;
if (*fmt == '^') {
ccl.compl = 1;
fmt++;
} else
ccl.compl = 0;
if (*fmt == ']')
fmt++;
while (*fmt != '\0' && *fmt != ']')
fmt++;
ccl.end = fmt;
fmt++;
flags |= NOSKIP;
c = CT_CCL;
break;
case 'C':
flags |= LONG;
/* FALLTHROUGH */
case 'c':
flags |= NOSKIP;
c = CT_CHAR;
break;
case 'p': /* pointer format is like hex */
flags |= POINTER | PFXOK;
c = CT_INT; /* assumes sizeof(uintmax_t) */
flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
base = 16;
break;
case 'n':
if (flags & SUPPRESS) /* ??? */
continue;
if (flags & SHORTSHORT)
*va_arg(ap, char *) = nread;
else if (flags & SHORT)
*va_arg(ap, short *) = nread;
else if (flags & LONG)
*va_arg(ap, long *) = nread;
else if (flags & LONGLONG)
*va_arg(ap, long long *) = nread;
else if (flags & INTMAXT)
*va_arg(ap, intmax_t *) = nread;
else if (flags & SIZET)
*va_arg(ap, size_t *) = nread;
else if (flags & PTRDIFFT)
*va_arg(ap, ptrdiff_t *) = nread;
else
*va_arg(ap, int *) = nread;
continue;
default:
goto match_failure;
/*
* Disgusting backwards compatibility hack. XXX
*/
case '\0': /* compat */
return (EOF);
}
/*
* Consume leading white space, except for formats
* that suppress this.
*/
if ((flags & NOSKIP) == 0) {
while ((wi = __fgetwc(fp, locale)) != WEOF && iswspace(wi))
nread++;
if (wi == WEOF)
goto input_failure;
__ungetwc(wi, fp, locale);
}
/*
* Do the conversion.
*/
switch (c) {
case CT_CHAR:
/* scan arbitrary characters (sets NOSKIP) */
if (width == 0)
width = 1;
if (flags & LONG) {
nr = convert_wchar(fp, GETARG(wchar_t *), width,
locale);
} else {
nr = convert_char(fp, GETARG(char *), width,
locale);
}
if (nr < 0)
goto input_failure;
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 & LONG) {
nr = convert_wccl(fp, GETARG(wchar_t *), width,
&ccl, locale);
} else {
nr = convert_ccl(fp, GETARG(char *), width,
&ccl, locale);
}
if (nr <= 0) {
if (nr < 0)
goto input_failure;
else /* nr == 0 */
goto match_failure;
}
break;
case CT_STRING:
/* like CCL, but zero-length string OK, & no NOSKIP */
if (width == 0)
width = (size_t)~0;
if (flags & LONG) {
nr = convert_wstring(fp, GETARG(wchar_t *),
width, locale);
} else {
nr = convert_string(fp, GETARG(char *), width,
locale);
}
if (nr < 0)
goto input_failure;
break;
case CT_INT:
/* scan an integer as if by the conversion function */
if (width == 0 || width > sizeof(buf) /
sizeof(*buf) - 1)
width = sizeof(buf) / sizeof(*buf) - 1;
nr = parseint(fp, buf, width, base, flags, locale);
if (nr == 0)
goto match_failure;
if ((flags & SUPPRESS) == 0) {
uintmax_t res;
buf[nr] = L'\0';
if ((flags & UNSIGNED) == 0)
res = wcstoimax(buf, NULL, base);
else
res = wcstoumax(buf, NULL, base);
if (flags & POINTER)
*va_arg(ap, void **) =
(void *)(uintptr_t)res;
else if (flags & SHORTSHORT)
*va_arg(ap, char *) = res;
else if (flags & SHORT)
*va_arg(ap, short *) = res;
else if (flags & LONG)
*va_arg(ap, long *) = res;
else if (flags & LONGLONG)
*va_arg(ap, long long *) = res;
else if (flags & INTMAXT)
*va_arg(ap, intmax_t *) = res;
else if (flags & PTRDIFFT)
*va_arg(ap, ptrdiff_t *) = res;
else if (flags & SIZET)
*va_arg(ap, size_t *) = res;
else
*va_arg(ap, int *) = res;
}
break;
#ifndef NO_FLOATING_POINT
case CT_FLOAT:
/* scan a floating point number as if by strtod */
if (width == 0 || width > sizeof(buf) /
sizeof(*buf) - 1)
width = sizeof(buf) / sizeof(*buf) - 1;
nr = parsefloat(fp, buf, buf + width, locale);
if (nr == 0)
goto match_failure;
if ((flags & SUPPRESS) == 0) {
if (flags & LONGDBL) {
long double res = wcstold(buf, NULL);
*va_arg(ap, long double *) = res;
} else if (flags & LONG) {
double res = wcstod(buf, NULL);
*va_arg(ap, double *) = res;
} else {
float res = wcstof(buf, NULL);
*va_arg(ap, float *) = res;
}
}
break;
#endif /* !NO_FLOATING_POINT */
}
if (!(flags & SUPPRESS))
nassigned++;
nread += nr;
nconversions++;
}
input_failure:
return (nconversions != 0 ? nassigned : EOF);
match_failure:
return (nassigned);
}
#ifndef NO_FLOATING_POINT
static int
parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t locale)
{
mbstate_t mbs;
size_t nconv;
wchar_t *commit, *p;
int infnanpos = 0;
enum {
S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
} state = S_START;
wchar_t c;
wchar_t decpt;
_Bool gotmantdig = 0, ishex = 0;
mbs = initial_mbs;
nconv = mbrtowc(&decpt, localeconv()->decimal_point, MB_CUR_MAX, &mbs);
if (nconv == (size_t)-1 || nconv == (size_t)-2)
decpt = '.'; /* failsafe */
/*
* We set commit = p whenever the string we have read so far
* constitutes a valid representation of a floating point
* number by itself. At some point, the parse will complete
* or fail, and we will ungetc() back to the last commit point.
* To ensure that the file offset gets updated properly, it is
* always necessary to read at least one character that doesn't
* match; thus, we can't short-circuit "infinity" or "nan(...)".
*/
commit = buf - 1;
c = WEOF;
for (p = buf; p < end; ) {
if ((c = __fgetwc(fp, locale)) == WEOF)
break;
reswitch:
switch (state) {
case S_START:
state = S_GOTSIGN;
if (c == '-' || c == '+')
break;
else
goto reswitch;
case S_GOTSIGN:
switch (c) {
case '0':
state = S_MAYBEHEX;
commit = p;
break;
case 'I':
case 'i':
state = S_INF;
break;
case 'N':
case 'n':
state = S_NAN;
break;
default:
state = S_DIGITS;
goto reswitch;
}
break;
case S_INF:
if (infnanpos > 6 ||
(c != "nfinity"[infnanpos] &&
c != "NFINITY"[infnanpos]))
goto parsedone;
if (infnanpos == 1 || infnanpos == 6)
commit = p; /* inf or infinity */
infnanpos++;
break;
case S_NAN:
switch (infnanpos) {
case 0:
if (c != 'A' && c != 'a')
goto parsedone;
break;
case 1:
if (c != 'N' && c != 'n')
goto parsedone;
else
commit = p;
break;
case 2:
if (c != '(')
goto parsedone;
break;
default:
if (c == ')') {
commit = p;
state = S_DONE;
} else if (!iswalnum(c) && c != '_')
goto parsedone;
break;
}
infnanpos++;
break;
case S_DONE:
goto parsedone;
case S_MAYBEHEX:
state = S_DIGITS;
if (c == 'X' || c == 'x') {
ishex = 1;
break;
} else { /* we saw a '0', but no 'x' */
gotmantdig = 1;
goto reswitch;
}
case S_DIGITS:
if ((ishex && iswxdigit(c)) || iswdigit(c))
gotmantdig = 1;
else {
state = S_FRAC;
if (c != decpt)
goto reswitch;
}
if (gotmantdig)
commit = p;
break;
case S_FRAC:
if (((c == 'E' || c == 'e') && !ishex) ||
((c == 'P' || c == 'p') && ishex)) {
if (!gotmantdig)
goto parsedone;
else
state = S_EXP;
} else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
commit = p;
gotmantdig = 1;
} else
goto parsedone;
break;
case S_EXP:
state = S_EXPDIGITS;
if (c == '-' || c == '+')
break;
else
goto reswitch;
case S_EXPDIGITS:
if (iswdigit(c))
commit = p;
else
goto parsedone;
break;
default:
abort();
}
*p++ = c;
c = WEOF;
}
parsedone:
if (c != WEOF)
__ungetwc(c, fp, locale);
while (commit < --p)
__ungetwc(*p, fp, locale);
*++commit = '\0';
return (commit - buf);
}
#endif