diff options
Diffstat (limited to 'StdLib/LibC/Stdio/vfwscanf.c')
| -rw-r--r-- | StdLib/LibC/Stdio/vfwscanf.c | 912 |
1 files changed, 0 insertions, 912 deletions
diff --git a/StdLib/LibC/Stdio/vfwscanf.c b/StdLib/LibC/Stdio/vfwscanf.c deleted file mode 100644 index ae149c3602..0000000000 --- a/StdLib/LibC/Stdio/vfwscanf.c +++ /dev/null @@ -1,912 +0,0 @@ -/** @file
- valist worker function for the wide-character fscanf.
-
- Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>
- This program and the accompanying materials are licensed and made available under
- the terms and conditions of the BSD License that accompanies this distribution.
- The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
- * 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.
-
- FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp
- NetBSD: vfwscanf.c,v 1.2 2005/06/12 05:48:41 lukem Exp
- */
-#include <LibConfig.h>
-#include <sys/EfiCdefs.h>
-
-#include "namespace.h"
-#include <ctype.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <stdarg.h>
-#include <string.h>
-#include <limits.h>
-#include <wchar.h>
-#include <wctype.h>
-
-#include "reentrant.h"
-#include "local.h"
-
-#ifndef NO_FLOATING_POINT
-#include <locale.h>
-#endif
-
-#if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */
- #pragma warning ( disable : 4244 ) // Allow wint_t to wchar_t conversions
- #pragma warning ( disable : 4305 ) // Allow truncation from UINT64 to void*
- #pragma warning ( disable : 4701 ) // Disable false warning for local variable p near line 375
-#endif
-
-
-#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: quad_t (+ 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 */
-
-static int parsefloat(FILE *, wchar_t *, wchar_t *);
-
-#define INCCL(_c) \
- (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
- (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
-
-/*
- * MT-safe version.
- */
-int
-vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
-{
- int ret;
-
- FLOCKFILE(fp);
- _SET_ORIENTATION(fp, 1);
- ret = __vfwscanf_unlocked(fp, fmt, ap);
- FUNLOCKFILE(fp);
- return (ret);
-}
-
-/*
- * Non-MT-safe version.
- */
-int
-__vfwscanf_unlocked(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
-{
- wint_t c; /* character from format, or conversion */
- size_t width; /* field width, or 0 */
- wchar_t *p = NULL; /* points into all kinds of strings */
- int n; /* handy integer */
- int flags; /* flags as defined above */
- wchar_t *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 conversion function */
- wchar_t buf[BUF]; /* buffer for numeric conversions */
- const wchar_t *ccls; /* character class start */
- const wchar_t *ccle; /* character class end */
- int cclcompl; /* ccl is complemented? */
- wint_t wi; /* handy wint_t */
- char *mbp; /* multibyte string pointer for %c %s %[ */
- size_t nconv; /* number of bytes in mb. conversion */
- char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
- mbstate_t mbs;
-
- static const mbstate_t initial = { 0 };
- /* `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;
- ccls = NULL;
- ccle = NULL;
- base = 0;
- cclcompl = 0;
- mbp = NULL;
-
- for (;;) {
- c = *fmt++;
- if (c == 0)
- return (nassigned);
- if (iswspace(c)) {
- while ((c = __fgetwc_unlock(fp)) != WEOF &&
- iswspace(c))
- ;
- if (c != WEOF)
- ungetwc(c, fp);
- 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_unlock(fp)) == WEOF)
- goto input_failure;
- if (wi != c) {
- ungetwc(wi, fp);
- goto match_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 '[':
- ccls = fmt;
- if (*fmt == '^') {
- cclcompl = 1;
- fmt++;
- } else
- cclcompl = 0;
- if (*fmt == ']')
- fmt++;
- while (*fmt != '\0' && *fmt != ']')
- fmt++;
- ccle = 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':
- nconversions++;
- if (flags & SUPPRESS) /* ??? */
- continue;
- if (flags & SHORTSHORT)
- *va_arg(ap, char *) = (char)nread;
- else if (flags & SHORT)
- *va_arg(ap, short *) = (short)nread;
- else if (flags & LONG)
- *va_arg(ap, long *) = (long)nread;
- else if (flags & LONGLONG)
- *va_arg(ap, INT64 *) = (INT64)nread; // was quad_t
- else if (flags & INTMAXT)
- *va_arg(ap, intmax_t *) = (intmax_t)nread;
- else if (flags & SIZET)
- *va_arg(ap, size_t *) = (size_t)nread;
- else if (flags & PTRDIFFT)
- *va_arg(ap, ptrdiff_t *) = (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_unlock(fp)) != WEOF && iswspace(wi))
- nread++;
- if (wi == WEOF)
- goto input_failure;
- ungetwc(wi, fp);
- }
-
- /*
- * Do the conversion.
- */
- switch (c) {
-
- case CT_CHAR:
- /* scan arbitrary characters (sets NOSKIP) */
- if (width == 0)
- width = 1;
- if (flags & LONG) {
- if (!(flags & SUPPRESS))
- p = va_arg(ap, wchar_t *);
- n = 0;
- while (width-- != 0 &&
- (wi = __fgetwc_unlock(fp)) != WEOF) {
- if (!(flags & SUPPRESS))
- *p++ = (wchar_t)wi;
- n++;
- }
- if (n == 0)
- goto input_failure;
- nread += n;
- if (!(flags & SUPPRESS))
- nassigned++;
- } else {
- if (!(flags & SUPPRESS))
- mbp = va_arg(ap, char *);
- n = 0;
- mbs = initial;
- while (width != 0 &&
- (wi = __fgetwc_unlock(fp)) != WEOF) {
- if (width >= MB_CUR_MAX &&
- !(flags & SUPPRESS)) {
- nconv = wcrtomb(mbp, (wchar_t)wi, &mbs);
- if (nconv == (size_t)-1)
- goto input_failure;
- } else {
- nconv = wcrtomb(mbbuf, (wchar_t)wi,
- &mbs);
- if (nconv == (size_t)-1)
- goto input_failure;
- if (nconv > width) {
- ungetwc(wi, fp);
- break;
- }
- if (!(flags & SUPPRESS))
- memcpy(mbp, mbbuf,
- nconv);
- }
- if (!(flags & SUPPRESS))
- mbp += nconv;
- width -= nconv;
- n++;
- }
- if (n == 0)
- goto input_failure;
- nread += n;
- if (!(flags & SUPPRESS))
- 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) && (flags & LONG)) {
- n = 0;
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width-- != 0 && INCCL(wi))
- n++;
- if (wi != WEOF)
- ungetwc(wi, fp);
- if (n == 0)
- goto match_failure;
- } else if (flags & LONG) {
- p0 = p = va_arg(ap, wchar_t *);
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width-- != 0 && INCCL(wi))
- *p++ = (wchar_t)wi;
- if (wi != WEOF)
- ungetwc(wi, fp);
- n = p - p0;
- if (n == 0)
- goto match_failure;
- *p = 0;
- nassigned++;
- } else {
- if (!(flags & SUPPRESS))
- mbp = va_arg(ap, char *);
- n = 0;
- mbs = initial;
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width != 0 && INCCL(wi)) {
- if (width >= MB_CUR_MAX &&
- !(flags & SUPPRESS)) {
- nconv = wcrtomb(mbp, wi, &mbs);
- 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;
- n++;
- }
- if (wi != WEOF)
- ungetwc(wi, fp);
- if (!(flags & SUPPRESS)) {
- *mbp = 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) && (flags & LONG)) {
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width-- != 0 &&
- !iswspace(wi))
- nread++;
- if (wi != WEOF)
- ungetwc(wi, fp);
- } else if (flags & LONG) {
- p0 = p = va_arg(ap, wchar_t *);
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width-- != 0 &&
- !iswspace(wi)) {
- *p++ = (wchar_t)wi;
- nread++;
- }
- if (wi != WEOF)
- ungetwc(wi, fp);
- *p = '\0';
- nassigned++;
- } else {
- if (!(flags & SUPPRESS))
- mbp = va_arg(ap, char *);
- mbs = initial;
- while ((wi = __fgetwc_unlock(fp)) != WEOF &&
- width != 0 &&
- !iswspace(wi)) {
- if (width >= MB_CUR_MAX &&
- !(flags & SUPPRESS)) {
- nconv = wcrtomb(mbp, wi, &mbs);
- 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 REAL_LONG_DOUBLE_SUPPORT
- if (flags & LONGDBL) {
- long double res = wcstold(buf, &p);
- *va_arg(ap, long double *) = res;
- } else
-#endif
- if (flags & (LONG | LONGDBL)) {
- double res = wcstod(buf, &p);
- *va_arg(ap, double *) = res;
- }
- else {
- float res = wcstof(buf, &p);
- *va_arg(ap, float *) = res;
- }
-#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
|