639 lines
19 KiB
C
639 lines
19 KiB
C
/* $OpenBSD: vfwscanf.c,v 1.4 2014/03/19 05:17:01 guenther Exp $ */
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/*-
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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. 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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*/
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#include <inttypes.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wctype.h>
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#include "local.h"
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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 0x00001 /* l: long or double */
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#define LONGDBL 0x00002 /* L: long double */
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#define SHORT 0x00004 /* h: short */
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#define SHORTSHORT 0x00008 /* hh: 8 bit integer */
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#define LLONG 0x00010 /* ll: long long (+ deprecated q: quad) */
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#define POINTER 0x00020 /* p: void * (as hex) */
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#define SIZEINT 0x00040 /* z: (signed) size_t */
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#define MAXINT 0x00080 /* j: intmax_t */
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#define PTRINT 0x00100 /* t: ptrdiff_t */
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#define NOSKIP 0x00200 /* [ or c: do not skip blanks */
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#define SUPPRESS 0x00400 /* *: suppress assignment */
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#define UNSIGNED 0x00800 /* %[oupxX] conversions */
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/*
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* The following are used in numeric conversions only:
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* SIGNOK, HAVESIGN, NDIGITS, DPTOK, and EXPOK are for floating point;
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* SIGNOK, HAVESIGN, NDIGITS, PFXOK, and NZDIGITS are for integral.
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*/
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#define SIGNOK 0x01000 /* +/- is (still) legal */
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#define HAVESIGN 0x02000 /* sign detected */
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#define NDIGITS 0x04000 /* no digits detected */
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#define DPTOK 0x08000 /* (float) decimal point is still legal */
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#define EXPOK 0x10000 /* (float) exponent (e+3, etc) still legal */
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#define PFXOK 0x08000 /* 0x prefix is (still) legal */
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#define NZDIGITS 0x10000 /* no zero digits 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 /* integer, i.e., strtoimax or strtoumax */
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#define CT_FLOAT 4 /* floating, i.e., strtod */
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// An interpretive version of __sccl from vfscanf.c --- a table of all wchar_t values would
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// be a little too expensive, and some kind of compressed version isn't worth the trouble.
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static inline bool in_ccl(wchar_t wc, const wchar_t* ccl) {
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// Is this a negated set?
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bool member_result = true;
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if (*ccl == '^') {
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member_result = false;
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++ccl;
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}
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// The first character may be ']' or '-' without being special.
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if (*ccl == '-' || *ccl == ']') {
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// A literal match?
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if (*ccl == wc) return member_result;
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++ccl;
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}
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while (*ccl && *ccl != ']') {
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// The last character may be '-' without being special.
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if (*ccl == '-' && ccl[1] != '\0' && ccl[1] != ']') {
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wchar_t first = *(ccl - 1);
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wchar_t last = *(ccl + 1);
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if (first <= last) {
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// In the range?
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if (wc >= first && wc <= last) return member_result;
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ccl += 2;
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continue;
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}
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// A '-' is not considered to be part of a range if the character after
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// is not greater than the character before, so fall through...
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}
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// A literal match?
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if (*ccl == wc) return member_result;
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++ccl;
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}
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return !member_result;
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wframe-larger-than="
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/*
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* vfwscanf
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*/
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int __vfwscanf(FILE* __restrict fp, const wchar_t* __restrict fmt, __va_list ap) {
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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 strtoimax/strtouimax */
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wchar_t buf[BUF]; /* buffer for numeric conversions */
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const wchar_t* ccl;
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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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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] = { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
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_SET_ORIENTATION(fp, 1);
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nassigned = 0;
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nconversions = 0;
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nread = 0;
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base = 0; /* XXX just to keep gcc happy */
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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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}
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if (iswspace(c)) {
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while ((c = __fgetwc_unlock(fp)) != WEOF && iswspace(c))
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;
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if (c != WEOF) __ungetwc(c, fp);
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continue;
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}
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if (c != '%') 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:
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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) goto input_failure;
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if (wi != c) {
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__ungetwc(wi, fp);
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goto match_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 |= MAXINT;
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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 (*fmt == 'h') {
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fmt++;
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flags |= SHORTSHORT;
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} else {
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flags |= SHORT;
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}
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goto again;
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case 'l':
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if (*fmt == 'l') {
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fmt++;
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flags |= LLONG;
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} else {
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flags |= LONG;
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}
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goto again;
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case 'q':
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flags |= LLONG; /* deprecated */
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goto again;
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case 't':
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flags |= PTRINT;
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goto again;
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case 'z':
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flags |= SIZEINT;
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goto again;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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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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* Those marked `compat' are for 4.[123]BSD compatibility.
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*/
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case 'D': /* compat */
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flags |= LONG;
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/* FALLTHROUGH */
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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': /* compat */
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flags |= LONG;
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/* FALLTHROUGH */
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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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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G':
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case 'a':
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case 'A':
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c = CT_FLOAT;
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break;
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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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ccl = fmt;
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if (*fmt == '^') fmt++;
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if (*fmt == ']') fmt++;
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while (*fmt != '\0' && *fmt != ']') 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 |= 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;
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flags |= UNSIGNED;
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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) continue;
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if (flags & SHORTSHORT)
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*va_arg(ap, signed char*) = nread;
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else if (flags & SHORT)
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*va_arg(ap, short*) = nread;
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else if (flags & LONG)
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*va_arg(ap, long*) = nread;
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else if (flags & SIZEINT)
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*va_arg(ap, ssize_t*) = nread;
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else if (flags & PTRINT)
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*va_arg(ap, ptrdiff_t*) = nread;
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else if (flags & LLONG)
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*va_arg(ap, long long*) = nread;
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else if (flags & MAXINT)
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*va_arg(ap, intmax_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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/*
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* Disgusting backwards compatibility hacks. XXX
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*/
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case '\0': /* compat */
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return (EOF);
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default: /* compat */
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if (iswupper(c)) flags |= LONG;
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c = CT_INT;
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base = 10;
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break;
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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)) nread++;
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if (wi == WEOF) 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) width = 1;
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if (flags & LONG) {
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if (!(flags & SUPPRESS)) p = va_arg(ap, wchar_t*);
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n = 0;
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while (width-- != 0 && (wi = __fgetwc_unlock(fp)) != WEOF) {
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if (!(flags & SUPPRESS)) *p++ = (wchar_t)wi;
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n++;
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}
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if (n == 0) goto input_failure;
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nread += n;
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if (!(flags & SUPPRESS)) nassigned++;
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} else {
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if (!(flags & SUPPRESS)) mbp = va_arg(ap, char*);
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n = 0;
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memset(&mbs, 0, sizeof(mbs));
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while (width != 0 && (wi = __fgetwc_unlock(fp)) != WEOF) {
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if (width >= MB_CUR_MAX && !(flags & SUPPRESS)) {
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nconv = wcrtomb(mbp, wi, &mbs);
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if (nconv == (size_t)-1) goto input_failure;
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} else {
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nconv = wcrtomb(mbbuf, wi, &mbs);
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if (nconv == (size_t)-1) 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)) memcpy(mbp, mbbuf, nconv);
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}
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if (!(flags & SUPPRESS)) mbp += nconv;
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width -= nconv;
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n++;
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}
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if (n == 0) goto input_failure;
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nread += n;
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if (!(flags & SUPPRESS)) 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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case CT_STRING:
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// CT_CCL: scan a (nonempty) character class (sets NOSKIP).
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// CT_STRING: like CCL, but zero-length string OK, & no NOSKIP.
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if (width == 0) width = (size_t)~0; // 'infinity'.
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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 && width-- != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) n++;
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if (wi != WEOF) __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 && width-- != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) {
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*p++ = (wchar_t)wi;
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}
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if (wi != WEOF) __ungetwc(wi, fp);
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n = p - p0;
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} else {
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if (!(flags & SUPPRESS)) mbp = va_arg(ap, char*);
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n = 0;
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memset(&mbs, 0, sizeof(mbs));
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while ((wi = __fgetwc_unlock(fp)) != WEOF && width != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) {
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if (width >= MB_CUR_MAX && !(flags & SUPPRESS)) {
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nconv = wcrtomb(mbp, wi, &mbs);
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if (nconv == (size_t)-1) goto input_failure;
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} else {
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nconv = wcrtomb(mbbuf, wi, &mbs);
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if (nconv == (size_t)-1) goto input_failure;
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if (nconv > width) break;
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if (!(flags & SUPPRESS)) memcpy(mbp, mbbuf, nconv);
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}
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if (!(flags & SUPPRESS)) mbp += nconv;
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width -= nconv;
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n++;
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}
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if (wi != WEOF) __ungetwc(wi, fp);
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}
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if (c == CT_CCL && n == 0) goto match_failure;
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if (!(flags & SUPPRESS)) {
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if (flags & LONG) {
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*p = L'\0';
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} else {
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*mbp = '\0';
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}
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++nassigned;
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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_INT:
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/* scan an integer as if by strtoimax/strtoumax */
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if (width == 0 || width > sizeof(buf) / sizeof(*buf) - 1)
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width = sizeof(buf) / sizeof(*buf) - 1;
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flags |= SIGNOK | NDIGITS | NZDIGITS;
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for (p = buf; width; width--) {
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c = __fgetwc_unlock(fp);
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/*
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* Switch on the character; `goto ok'
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* if we accept it as a part of number.
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*/
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switch (c) {
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/*
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* The digit 0 is always legal, but is
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* special. For %i conversions, if no
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* digits (zero or nonzero) have been
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* scanned (only signs), we will have
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* base==0. In that case, we should set
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* it to 8 and enable 0x prefixing.
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* Also, if we have not scanned zero digits
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* before this, do not turn off prefixing
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* (someone else will turn it off if we
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* have scanned any nonzero digits).
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*/
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case '0':
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if (base == 0) {
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base = 8;
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flags |= PFXOK;
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}
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if (flags & NZDIGITS)
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flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
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else
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flags &= ~(SIGNOK | PFXOK | NDIGITS);
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goto ok;
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/* 1 through 7 always legal */
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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base = basefix[base];
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flags &= ~(SIGNOK | PFXOK | NDIGITS);
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goto ok;
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/* digits 8 and 9 ok iff decimal or hex */
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case '8':
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case '9':
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base = basefix[base];
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if (base <= 8) break; /* not legal here */
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flags &= ~(SIGNOK | PFXOK | NDIGITS);
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goto ok;
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/* letters ok iff hex */
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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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 and 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)
|
|
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 & MAXINT)
|
|
*va_arg(ap, intmax_t*) = res;
|
|
else if (flags & LLONG)
|
|
*va_arg(ap, long long*) = res;
|
|
else if (flags & SIZEINT)
|
|
*va_arg(ap, ssize_t*) = res;
|
|
else if (flags & PTRINT)
|
|
*va_arg(ap, ptrdiff_t*) = res;
|
|
else if (flags & LONG)
|
|
*va_arg(ap, long*) = res;
|
|
else if (flags & SHORT)
|
|
*va_arg(ap, short*) = res;
|
|
else if (flags & SHORTSHORT)
|
|
*va_arg(ap, signed char*) = res;
|
|
else
|
|
*va_arg(ap, int*) = res;
|
|
nassigned++;
|
|
}
|
|
nread += p - buf;
|
|
nconversions++;
|
|
break;
|
|
|
|
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 = wparsefloat(fp, buf, buf + width)) == 0) goto match_failure;
|
|
if ((flags & SUPPRESS) == 0) {
|
|
if (flags & LONGDBL) {
|
|
long double res = wcstold(buf, &p);
|
|
*va_arg(ap, long double*) = res;
|
|
} else if (flags & LONG) {
|
|
double res = wcstod(buf, &p);
|
|
*va_arg(ap, double*) = res;
|
|
} else {
|
|
float res = wcstof(buf, &p);
|
|
*va_arg(ap, float*) = res;
|
|
}
|
|
if (p - buf != (ptrdiff_t)width) abort();
|
|
nassigned++;
|
|
}
|
|
nread += width;
|
|
nconversions++;
|
|
break;
|
|
}
|
|
}
|
|
input_failure:
|
|
return (nconversions != 0 ? nassigned : EOF);
|
|
match_failure:
|
|
return (nassigned);
|
|
}
|
|
#pragma GCC diagnostic pop
|