mirror of https://github.com/acidanthera/audk.git
910 lines
25 KiB
C
910 lines
25 KiB
C
/*-
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Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp
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NetBSD: vfwscanf.c,v 1.2 2005/06/12 05:48:41 lukem Exp
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*/
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#include <LibConfig.h>
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#include <sys/EfiCdefs.h>
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#include "namespace.h"
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <limits.h>
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#include <wchar.h>
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#include <wctype.h>
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#include "reentrant.h"
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#include "local.h"
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#ifndef NO_FLOATING_POINT
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#include <locale.h>
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#endif
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#if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */
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#pragma warning ( disable : 4244 ) // Allow wint_t to wchar_t conversions
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#pragma warning ( disable : 4305 ) // Allow truncation from UINT64 to void*
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#pragma warning ( disable : 4701 ) // Disable false warning for local variable p near line 375
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#endif
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#define BUF 513 /* Maximum length of numeric string. */
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/*
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* Flags used during conversion.
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*/
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#define LONG 0x01 /* l: long or double */
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#define LONGDBL 0x02 /* L: long double */
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#define SHORT 0x04 /* h: short */
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#define SUPPRESS 0x08 /* *: suppress assignment */
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#define POINTER 0x10 /* p: void * (as hex) */
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#define NOSKIP 0x20 /* [ or c: do not skip blanks */
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#define LONGLONG 0x400 /* ll: quad_t (+ deprecated q: quad) */
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#define INTMAXT 0x800 /* j: intmax_t */
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#define PTRDIFFT 0x1000 /* t: ptrdiff_t */
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#define SIZET 0x2000 /* z: size_t */
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#define SHORTSHORT 0x4000 /* hh: char */
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#define UNSIGNED 0x8000 /* %[oupxX] conversions */
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/*
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* The following are used in integral conversions only:
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* SIGNOK, NDIGITS, PFXOK, and NZDIGITS
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*/
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#define SIGNOK 0x40 /* +/- is (still) legal */
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#define NDIGITS 0x80 /* no digits detected */
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#define PFXOK 0x100 /* 0x prefix is (still) legal */
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#define NZDIGITS 0x200 /* no zero digits detected */
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#define HAVESIGN 0x10000 /* sign detected */
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/*
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* Conversion types.
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*/
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#define CT_CHAR 0 /* %c conversion */
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#define CT_CCL 1 /* %[...] conversion */
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#define CT_STRING 2 /* %s conversion */
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#define CT_INT 3 /* %[dioupxX] conversion */
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#define CT_FLOAT 4 /* %[efgEFG] conversion */
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static int parsefloat(FILE *, wchar_t *, wchar_t *);
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#define INCCL(_c) \
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(cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
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(wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
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/*
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* MT-safe version.
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*/
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int
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vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
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{
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int ret;
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FLOCKFILE(fp);
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_SET_ORIENTATION(fp, 1);
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ret = __vfwscanf_unlocked(fp, fmt, ap);
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FUNLOCKFILE(fp);
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return (ret);
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}
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/*
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* Non-MT-safe version.
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*/
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int
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__vfwscanf_unlocked(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
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{
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wint_t c; /* character from format, or conversion */
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size_t width; /* field width, or 0 */
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wchar_t *p; /* points into all kinds of strings */
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int n; /* handy integer */
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int flags; /* flags as defined above */
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wchar_t *p0; /* saves original value of p when necessary */
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int nassigned; /* number of fields assigned */
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int nconversions; /* number of conversions */
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int nread; /* number of characters consumed from fp */
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int base; /* base argument to conversion function */
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wchar_t buf[BUF]; /* buffer for numeric conversions */
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const wchar_t *ccls; /* character class start */
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const wchar_t *ccle; /* character class end */
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int cclcompl; /* ccl is complemented? */
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wint_t wi; /* handy wint_t */
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char *mbp; /* multibyte string pointer for %c %s %[ */
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size_t nconv; /* number of bytes in mb. conversion */
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char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
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static const mbstate_t initial = { 0 };
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mbstate_t mbs;
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/* `basefix' is used to avoid `if' tests in the integer scanner */
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static short basefix[17] =
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{ 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
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nassigned = 0;
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nconversions = 0;
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nread = 0;
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ccls = ccle = NULL;
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base = 0;
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cclcompl = 0;
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mbp = NULL;
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for (;;) {
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c = *fmt++;
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if (c == 0)
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return (nassigned);
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if (iswspace(c)) {
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while ((c = __fgetwc_unlock(fp)) != WEOF &&
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iswspace(c))
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;
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if (c != WEOF)
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ungetwc(c, fp);
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continue;
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}
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if (c != '%')
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goto literal;
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width = 0;
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flags = 0;
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/*
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* switch on the format. continue if done;
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* break once format type is derived.
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*/
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again: c = *fmt++;
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switch (c) {
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case '%':
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literal:
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if ((wi = __fgetwc_unlock(fp)) == WEOF)
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goto input_failure;
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if (wi != c) {
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ungetwc(wi, fp);
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goto input_failure;
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}
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nread++;
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continue;
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case '*':
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flags |= SUPPRESS;
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goto again;
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case 'j':
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flags |= INTMAXT;
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goto again;
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case 'l':
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if (flags & LONG) {
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flags &= ~LONG;
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flags |= LONGLONG;
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} else
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flags |= LONG;
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goto again;
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case 'q':
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flags |= LONGLONG; /* not quite */
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goto again;
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case 't':
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flags |= PTRDIFFT;
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goto again;
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case 'z':
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flags |= SIZET;
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goto again;
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case 'L':
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flags |= LONGDBL;
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goto again;
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case 'h':
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if (flags & SHORT) {
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flags &= ~SHORT;
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flags |= SHORTSHORT;
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} else
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flags |= SHORT;
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goto again;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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width = width * 10 + c - '0';
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goto again;
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/*
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* Conversions.
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*/
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case 'd':
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c = CT_INT;
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base = 10;
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break;
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case 'i':
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c = CT_INT;
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base = 0;
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break;
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case 'o':
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c = CT_INT;
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flags |= UNSIGNED;
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base = 8;
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break;
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case 'u':
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c = CT_INT;
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flags |= UNSIGNED;
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base = 10;
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break;
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case 'X':
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case 'x':
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flags |= PFXOK; /* enable 0x prefixing */
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c = CT_INT;
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flags |= UNSIGNED;
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base = 16;
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break;
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#ifndef NO_FLOATING_POINT
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//case 'A':
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case 'E': case 'F': case 'G':
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//case 'a':
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case 'e': case 'f': case 'g':
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c = CT_FLOAT;
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break;
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#endif
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case 'S':
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flags |= LONG;
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/* FALLTHROUGH */
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case 's':
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c = CT_STRING;
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break;
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case '[':
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ccls = fmt;
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if (*fmt == '^') {
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cclcompl = 1;
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fmt++;
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} else
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cclcompl = 0;
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if (*fmt == ']')
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fmt++;
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while (*fmt != '\0' && *fmt != ']')
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fmt++;
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ccle = fmt;
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fmt++;
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flags |= NOSKIP;
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c = CT_CCL;
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break;
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case 'C':
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flags |= LONG;
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/* FALLTHROUGH */
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case 'c':
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flags |= NOSKIP;
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c = CT_CHAR;
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break;
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case 'p': /* pointer format is like hex */
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flags |= POINTER | PFXOK;
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c = CT_INT; /* assumes sizeof(uintmax_t) */
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flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
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base = 16;
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break;
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case 'n':
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nconversions++;
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if (flags & SUPPRESS) /* ??? */
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continue;
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if (flags & SHORTSHORT)
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*va_arg(ap, char *) = (char)nread;
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else if (flags & SHORT)
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*va_arg(ap, short *) = (short)nread;
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else if (flags & LONG)
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*va_arg(ap, long *) = (long)nread;
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else if (flags & LONGLONG)
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*va_arg(ap, INT64 *) = (INT64)nread; // was quad_t
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else if (flags & INTMAXT)
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*va_arg(ap, intmax_t *) = (intmax_t)nread;
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else if (flags & SIZET)
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*va_arg(ap, size_t *) = (size_t)nread;
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else if (flags & PTRDIFFT)
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*va_arg(ap, ptrdiff_t *) = (ptrdiff_t)nread;
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else
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*va_arg(ap, int *) = nread;
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continue;
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default:
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goto match_failure;
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/*
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* Disgusting backwards compatibility hack. XXX
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*/
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case '\0': /* compat */
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return (EOF);
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}
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/*
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* Consume leading white space, except for formats
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* that suppress this.
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*/
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if ((flags & NOSKIP) == 0) {
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while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
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nread++;
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if (wi == WEOF)
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goto input_failure;
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ungetwc(wi, fp);
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}
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/*
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* Do the conversion.
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*/
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switch (c) {
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case CT_CHAR:
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/* scan arbitrary characters (sets NOSKIP) */
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if (width == 0)
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width = 1;
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if (flags & LONG) {
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if (!(flags & SUPPRESS))
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p = va_arg(ap, wchar_t *);
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n = 0;
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while (width-- != 0 &&
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(wi = __fgetwc_unlock(fp)) != WEOF) {
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if (!(flags & SUPPRESS))
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*p++ = (wchar_t)wi;
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n++;
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}
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if (n == 0)
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goto input_failure;
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nread += n;
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if (!(flags & SUPPRESS))
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nassigned++;
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} else {
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if (!(flags & SUPPRESS))
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mbp = va_arg(ap, char *);
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n = 0;
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mbs = initial;
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while (width != 0 &&
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(wi = __fgetwc_unlock(fp)) != WEOF) {
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if (width >= MB_CUR_MAX &&
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!(flags & SUPPRESS)) {
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nconv = wcrtomb(mbp, (wchar_t)wi, &mbs);
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if (nconv == (size_t)-1)
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goto input_failure;
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} else {
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nconv = wcrtomb(mbbuf, (wchar_t)wi,
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&mbs);
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if (nconv == (size_t)-1)
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goto input_failure;
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if (nconv > width) {
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ungetwc(wi, fp);
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break;
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}
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if (!(flags & SUPPRESS))
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memcpy(mbp, mbbuf,
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nconv);
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}
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if (!(flags & SUPPRESS))
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mbp += nconv;
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width -= nconv;
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n++;
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}
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if (n == 0)
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goto input_failure;
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nread += n;
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if (!(flags & SUPPRESS))
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nassigned++;
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}
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nconversions++;
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break;
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case CT_CCL:
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/* scan a (nonempty) character class (sets NOSKIP) */
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if (width == 0)
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width = (size_t)~0; /* `infinity' */
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/* take only those things in the class */
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if ((flags & SUPPRESS) && (flags & LONG)) {
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n = 0;
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width-- != 0 && INCCL(wi))
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n++;
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if (wi != WEOF)
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ungetwc(wi, fp);
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if (n == 0)
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goto match_failure;
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} else if (flags & LONG) {
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p0 = p = va_arg(ap, wchar_t *);
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width-- != 0 && INCCL(wi))
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*p++ = (wchar_t)wi;
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if (wi != WEOF)
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ungetwc(wi, fp);
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n = p - p0;
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if (n == 0)
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goto match_failure;
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*p = 0;
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nassigned++;
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} else {
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if (!(flags & SUPPRESS))
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mbp = va_arg(ap, char *);
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n = 0;
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mbs = initial;
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width != 0 && INCCL(wi)) {
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if (width >= MB_CUR_MAX &&
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!(flags & SUPPRESS)) {
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nconv = wcrtomb(mbp, wi, &mbs);
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if (nconv == (size_t)-1)
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goto input_failure;
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} else {
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nconv = wcrtomb(mbbuf, wi,
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&mbs);
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if (nconv == (size_t)-1)
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goto input_failure;
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if (nconv > width)
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break;
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if (!(flags & SUPPRESS))
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memcpy(mbp, mbbuf,
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nconv);
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}
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if (!(flags & SUPPRESS))
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mbp += nconv;
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width -= nconv;
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n++;
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}
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if (wi != WEOF)
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ungetwc(wi, fp);
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if (!(flags & SUPPRESS)) {
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*mbp = 0;
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nassigned++;
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}
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}
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nread += n;
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nconversions++;
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break;
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case CT_STRING:
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/* like CCL, but zero-length string OK, & no NOSKIP */
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if (width == 0)
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width = (size_t)~0;
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if ((flags & SUPPRESS) && (flags & LONG)) {
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width-- != 0 &&
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!iswspace(wi))
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nread++;
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if (wi != WEOF)
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ungetwc(wi, fp);
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} else if (flags & LONG) {
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p0 = p = va_arg(ap, wchar_t *);
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width-- != 0 &&
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!iswspace(wi)) {
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*p++ = (wchar_t)wi;
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nread++;
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}
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if (wi != WEOF)
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ungetwc(wi, fp);
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*p = '\0';
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nassigned++;
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} else {
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if (!(flags & SUPPRESS))
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mbp = va_arg(ap, char *);
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mbs = initial;
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while ((wi = __fgetwc_unlock(fp)) != WEOF &&
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width != 0 &&
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!iswspace(wi)) {
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if (width >= MB_CUR_MAX &&
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!(flags & SUPPRESS)) {
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nconv = wcrtomb(mbp, wi, &mbs);
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|
if (nconv == (size_t)-1)
|
|
goto input_failure;
|
|
} else {
|
|
nconv = wcrtomb(mbbuf, wi,
|
|
&mbs);
|
|
if (nconv == (size_t)-1)
|
|
goto input_failure;
|
|
if (nconv > width)
|
|
break;
|
|
if (!(flags & SUPPRESS))
|
|
memcpy(mbp, mbbuf,
|
|
nconv);
|
|
}
|
|
if (!(flags & SUPPRESS))
|
|
mbp += nconv;
|
|
width -= nconv;
|
|
nread++;
|
|
}
|
|
if (wi != WEOF)
|
|
ungetwc(wi, fp);
|
|
if (!(flags & SUPPRESS)) {
|
|
*mbp = 0;
|
|
nassigned++;
|
|
}
|
|
}
|
|
nconversions++;
|
|
continue;
|
|
|
|
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;
|
|
flags |= SIGNOK | NDIGITS | NZDIGITS;
|
|
for (p = buf; width; width--) {
|
|
c = __fgetwc_unlock(fp);
|
|
/*
|
|
* 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 && p ==
|
|
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);
|
|
break;
|
|
ok:
|
|
/*
|
|
* c is legal: store it and look at the next.
|
|
*/
|
|
*p++ = (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 (p > buf)
|
|
ungetwc(*--p, fp);
|
|
goto match_failure;
|
|
}
|
|
c = p[-1];
|
|
if (c == 'x' || c == 'X') {
|
|
--p;
|
|
ungetwc(c, fp);
|
|
}
|
|
if ((flags & SUPPRESS) == 0) {
|
|
uintmax_t res;
|
|
|
|
*p = 0;
|
|
if ((flags & UNSIGNED) == 0)
|
|
res = wcstoimax(buf, NULL, base);
|
|
else
|
|
res = wcstoumax(buf, NULL, base);
|
|
|
|
if (flags & POINTER) {
|
|
*va_arg(ap, void **) = (void *)res;
|
|
}
|
|
else if (flags & SHORTSHORT) {
|
|
*va_arg(ap, char *) = (char)res;
|
|
}
|
|
else if (flags & SHORT) {
|
|
*va_arg(ap, short *) = (short)res;
|
|
}
|
|
else if (flags & LONG) {
|
|
*va_arg(ap, long *) = (long)res;
|
|
}
|
|
else if (flags & LONGLONG) {
|
|
*va_arg(ap, INT64 *) = res; // was quad_t
|
|
}
|
|
else if (flags & INTMAXT) {
|
|
*va_arg(ap, intmax_t *) = res;
|
|
}
|
|
else if (flags & PTRDIFFT) {
|
|
*va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
|
|
}
|
|
else if (flags & SIZET) {
|
|
*va_arg(ap, size_t *) = (size_t)res;
|
|
}
|
|
else {
|
|
*va_arg(ap, int *) = (int)res;
|
|
}
|
|
nassigned++;
|
|
}
|
|
nread += p - buf;
|
|
nconversions++;
|
|
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;
|
|
if ((width = parsefloat(fp, buf, buf + width)) == 0)
|
|
goto match_failure;
|
|
if ((flags & SUPPRESS) == 0) {
|
|
#ifdef notyet
|
|
if (flags & LONGDBL) {
|
|
long double res = wcstold(buf, &p);
|
|
*va_arg(ap, long double *) = res;
|
|
} else
|
|
#endif
|
|
if (flags & LONG) {
|
|
double res = wcstod(buf, &p);
|
|
*va_arg(ap, double *) = res;
|
|
#ifdef notyet
|
|
} else {
|
|
float res = wcstof(buf, &p);
|
|
*va_arg(ap, float *) = res;
|
|
#endif
|
|
}
|
|
#ifdef DEBUG
|
|
if (p - buf != width)
|
|
abort();
|
|
#endif
|
|
nassigned++;
|
|
}
|
|
nread += (int)width;
|
|
nconversions++;
|
|
break;
|
|
#endif /* !NO_FLOATING_POINT */
|
|
}
|
|
}
|
|
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)
|
|
{
|
|
wchar_t *commit, *p;
|
|
int infnanpos = 0;
|
|
enum {
|
|
S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
|
|
S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
|
|
} state = S_START;
|
|
wchar_t c;
|
|
wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
|
|
int gotmantdig = 0, ishex = 0;
|
|
|
|
/*
|
|
* 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 = (wchar_t)WEOF;
|
|
for (p = buf; p < end; ) {
|
|
if ((wint_t)(c = __fgetwc_unlock(fp)) == 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 -1: /* XXX kludge to deal with nan(...) */
|
|
goto parsedone;
|
|
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;
|
|
infnanpos = -2;
|
|
} else if (!iswalnum(c) && c != '_')
|
|
goto parsedone;
|
|
break;
|
|
}
|
|
infnanpos++;
|
|
break;
|
|
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 = (wchar_t)WEOF;
|
|
}
|
|
|
|
parsedone:
|
|
if ((wint_t)c != WEOF)
|
|
ungetwc(c, fp);
|
|
while (commit < --p)
|
|
ungetwc(*p, fp);
|
|
*++commit = '\0';
|
|
return (commit - buf);
|
|
}
|
|
#endif
|