792 lines
19 KiB
C
792 lines
19 KiB
C
/* $OpenBSD: vfscanf.c,v 1.21 2006/01/13 21:33:28 millert 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 <ctype.h>
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#include <inttypes.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 "local.h"
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#ifdef FLOATING_POINT
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#include "floatio.h"
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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 0x00001 /* l: long or double */
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#define LONGDBL 0x00002 /* L: long double; unimplemented */
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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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#define u_char unsigned char
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#define u_long unsigned long
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static u_char *__sccl(char *, u_char *);
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#if !defined(VFSCANF)
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#define VFSCANF vfscanf
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#endif
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/*
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* vfscanf
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*/
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int
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VFSCANF(FILE *fp, const char *fmt0, __va_list ap)
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{
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u_char *fmt = (u_char *)fmt0;
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int c; /* character from format, or conversion */
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size_t width; /* field width, or 0 */
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char *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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char *p0; /* saves original value of p when necessary */
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int nassigned; /* number of fields assigned */
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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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char ccltab[256]; /* character class table for %[...] */
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char buf[BUF]; /* buffer for numeric conversions */
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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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_SET_ORIENTATION(fp, -1);
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nassigned = 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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if (isspace(c)) {
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while ((fp->_r > 0 || __srefill(fp) == 0) &&
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isspace(*fp->_p))
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nread++, fp->_r--, fp->_p++;
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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 (fp->_r <= 0 && __srefill(fp))
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goto input_failure;
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if (*fp->_p != c)
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goto match_failure;
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fp->_r--, fp->_p++;
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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': 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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* Those marked `compat' are for 4.[123]BSD compatibility.
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*
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* (According to ANSI, E and X formats are supposed
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* to the same as e and x. Sorry about that.)
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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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#ifdef FLOATING_POINT
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case 'E':
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case 'G':
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case 'e':
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case 'f':
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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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c = CT_STRING;
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break;
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case '[':
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fmt = __sccl(ccltab, 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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if (flags & SUPPRESS)
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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 (isupper(c))
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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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* We have a conversion that requires input.
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*/
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if (fp->_r <= 0 && __srefill(fp))
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goto input_failure;
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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 (isspace(*fp->_p)) {
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nread++;
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if (--fp->_r > 0)
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fp->_p++;
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else if (__srefill(fp))
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goto input_failure;
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}
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/*
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* Note that there is at least one character in
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* the buffer, so conversions that do not set NOSKIP
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* ca no longer result in an input failure.
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*/
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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 & SUPPRESS) {
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size_t sum = 0;
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for (;;) {
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if ((n = fp->_r) < (int)width) {
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sum += n;
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width -= n;
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fp->_p += n;
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if (__srefill(fp)) {
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if (sum == 0)
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goto input_failure;
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break;
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}
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} else {
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sum += width;
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fp->_r -= width;
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fp->_p += width;
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break;
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}
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}
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nread += sum;
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} else {
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size_t r = fread((void *)va_arg(ap, char *), 1,
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width, fp);
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if (r == 0)
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goto input_failure;
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nread += r;
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nassigned++;
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}
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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) {
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n = 0;
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while (ccltab[*fp->_p]) {
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n++, fp->_r--, fp->_p++;
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if (--width == 0)
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break;
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if (fp->_r <= 0 && __srefill(fp)) {
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if (n == 0)
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goto input_failure;
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break;
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}
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}
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if (n == 0)
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goto match_failure;
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} else {
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p0 = p = va_arg(ap, char *);
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while (ccltab[*fp->_p]) {
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fp->_r--;
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*p++ = *fp->_p++;
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if (--width == 0)
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break;
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if (fp->_r <= 0 && __srefill(fp)) {
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if (p == p0)
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goto input_failure;
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break;
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}
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}
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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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}
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nread += n;
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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) {
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n = 0;
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while (!isspace(*fp->_p)) {
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n++, fp->_r--, fp->_p++;
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if (--width == 0)
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break;
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if (fp->_r <= 0 && __srefill(fp))
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break;
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}
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nread += n;
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} else {
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p0 = p = va_arg(ap, char *);
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while (!isspace(*fp->_p)) {
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fp->_r--;
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*p++ = *fp->_p++;
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if (--width == 0)
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break;
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if (fp->_r <= 0 && __srefill(fp))
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break;
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}
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*p = '\0';
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nread += p - p0;
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nassigned++;
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}
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continue;
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case CT_INT:
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/* scan an integer as if by strtoimax/strtoumax */
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#ifdef hardway
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if (width == 0 || width > sizeof(buf) - 1)
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width = sizeof(buf) - 1;
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#else
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/* size_t is unsigned, hence this optimisation */
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if (--width > sizeof(buf) - 2)
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width = sizeof(buf) - 2;
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width++;
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#endif
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flags |= SIGNOK | NDIGITS | NZDIGITS;
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for (p = buf; width; width--) {
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c = *fp->_p;
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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': case '2': case '3':
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case '4': case '5': case '6': 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': case '9':
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base = basefix[base];
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if (base <= 8)
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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': case 'B': case 'C':
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case 'D': case 'E': case 'F':
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case 'a': case 'b': case 'c':
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case 'd': case 'e': case 'f':
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/* no need to fix base here */
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if (base <= 10)
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break; /* not legal here */
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flags &= ~(SIGNOK | PFXOK | NDIGITS);
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goto ok;
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/* sign ok only as first character */
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case '+': case '-':
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if (flags & SIGNOK) {
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flags &= ~SIGNOK;
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flags |= HAVESIGN;
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goto ok;
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}
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break;
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/*
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* x ok iff flag still set and 2nd char (or
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* 3rd char if we have a sign).
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*/
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case 'x': case 'X':
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if ((flags & PFXOK) && p ==
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buf + 1 + !!(flags & HAVESIGN)) {
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base = 16; /* if %i */
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flags &= ~PFXOK;
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goto ok;
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}
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break;
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}
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/*
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* If we got here, c is not a legal character
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* for a number. Stop accumulating digits.
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*/
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break;
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ok:
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/*
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* c is legal: store it and look at the next.
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*/
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*p++ = c;
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if (--fp->_r > 0)
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fp->_p++;
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else if (__srefill(fp))
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break; /* EOF */
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}
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/*
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* If we had only a sign, it is no good; push
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* back the sign. If the number ends in `x',
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* it was [sign] '0' 'x', so push back the x
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* and treat it as [sign] '0'.
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*/
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if (flags & NDIGITS) {
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if (p > buf)
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(void) ungetc(*(u_char *)--p, fp);
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goto match_failure;
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|
}
|
|
c = ((u_char *)p)[-1];
|
|
if (c == 'x' || c == 'X') {
|
|
--p;
|
|
(void) ungetc(c, fp);
|
|
}
|
|
if ((flags & SUPPRESS) == 0) {
|
|
uintmax_t res;
|
|
|
|
*p = '\0';
|
|
if (flags & UNSIGNED)
|
|
res = strtoumax(buf, NULL, base);
|
|
else
|
|
res = strtoimax(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;
|
|
break;
|
|
|
|
#ifdef FLOATING_POINT
|
|
case CT_FLOAT:
|
|
/* scan a floating point number as if by strtod */
|
|
#ifdef hardway
|
|
if (width == 0 || width > sizeof(buf) - 1)
|
|
width = sizeof(buf) - 1;
|
|
#else
|
|
/* size_t is unsigned, hence this optimisation */
|
|
if (--width > sizeof(buf) - 2)
|
|
width = sizeof(buf) - 2;
|
|
width++;
|
|
#endif
|
|
flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
|
|
for (p = buf; width; width--) {
|
|
c = *fp->_p;
|
|
/*
|
|
* This code mimicks the integer conversion
|
|
* code, but is much simpler.
|
|
*/
|
|
switch (c) {
|
|
|
|
case '0': case '1': case '2': case '3':
|
|
case '4': case '5': case '6': case '7':
|
|
case '8': case '9':
|
|
flags &= ~(SIGNOK | NDIGITS);
|
|
goto fok;
|
|
|
|
case '+': case '-':
|
|
if (flags & SIGNOK) {
|
|
flags &= ~SIGNOK;
|
|
goto fok;
|
|
}
|
|
break;
|
|
case '.':
|
|
if (flags & DPTOK) {
|
|
flags &= ~(SIGNOK | DPTOK);
|
|
goto fok;
|
|
}
|
|
break;
|
|
case 'e': case 'E':
|
|
/* no exponent without some digits */
|
|
if ((flags&(NDIGITS|EXPOK)) == EXPOK) {
|
|
flags =
|
|
(flags & ~(EXPOK|DPTOK)) |
|
|
SIGNOK | NDIGITS;
|
|
goto fok;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
fok:
|
|
*p++ = c;
|
|
if (--fp->_r > 0)
|
|
fp->_p++;
|
|
else if (__srefill(fp))
|
|
break; /* EOF */
|
|
}
|
|
/*
|
|
* If no digits, might be missing exponent digits
|
|
* (just give back the exponent) or might be missing
|
|
* regular digits, but had sign and/or decimal point.
|
|
*/
|
|
if (flags & NDIGITS) {
|
|
if (flags & EXPOK) {
|
|
/* no digits at all */
|
|
while (p > buf)
|
|
ungetc(*(u_char *)--p, fp);
|
|
goto match_failure;
|
|
}
|
|
/* just a bad exponent (e and maybe sign) */
|
|
c = *(u_char *)--p;
|
|
if (c != 'e' && c != 'E') {
|
|
(void) ungetc(c, fp);/* sign */
|
|
c = *(u_char *)--p;
|
|
}
|
|
(void) ungetc(c, fp);
|
|
}
|
|
if ((flags & SUPPRESS) == 0) {
|
|
double res;
|
|
|
|
*p = '\0';
|
|
res = strtod(buf, (char **) NULL);
|
|
if (flags & LONGDBL)
|
|
*va_arg(ap, long double *) = res;
|
|
else if (flags & LONG)
|
|
*va_arg(ap, double *) = res;
|
|
else
|
|
*va_arg(ap, float *) = res;
|
|
nassigned++;
|
|
}
|
|
nread += p - buf;
|
|
break;
|
|
#endif /* FLOATING_POINT */
|
|
}
|
|
}
|
|
input_failure:
|
|
return (nassigned ? nassigned : -1);
|
|
match_failure:
|
|
return (nassigned);
|
|
}
|
|
|
|
/*
|
|
* Fill in the given table from the scanset at the given format
|
|
* (just after `['). Return a pointer to the character past the
|
|
* closing `]'. The table has a 1 wherever characters should be
|
|
* considered part of the scanset.
|
|
*/
|
|
static u_char *
|
|
__sccl(char *tab, u_char *fmt)
|
|
{
|
|
int c, n, v;
|
|
|
|
/* first `clear' the whole table */
|
|
c = *fmt++; /* first char hat => negated scanset */
|
|
if (c == '^') {
|
|
v = 1; /* default => accept */
|
|
c = *fmt++; /* get new first char */
|
|
} else
|
|
v = 0; /* default => reject */
|
|
/* should probably use memset here */
|
|
for (n = 0; n < 256; n++)
|
|
tab[n] = v;
|
|
if (c == 0)
|
|
return (fmt - 1);/* format ended before closing ] */
|
|
|
|
/*
|
|
* Now set the entries corresponding to the actual scanset
|
|
* to the opposite of the above.
|
|
*
|
|
* The first character may be ']' (or '-') without being special;
|
|
* the last character may be '-'.
|
|
*/
|
|
v = 1 - v;
|
|
for (;;) {
|
|
tab[c] = v; /* take character c */
|
|
doswitch:
|
|
n = *fmt++; /* and examine the next */
|
|
switch (n) {
|
|
|
|
case 0: /* format ended too soon */
|
|
return (fmt - 1);
|
|
|
|
case '-':
|
|
/*
|
|
* A scanset of the form
|
|
* [01+-]
|
|
* is defined as `the digit 0, the digit 1,
|
|
* the character +, the character -', but
|
|
* the effect of a scanset such as
|
|
* [a-zA-Z0-9]
|
|
* is implementation defined. The V7 Unix
|
|
* scanf treats `a-z' as `the letters a through
|
|
* z', but treats `a-a' as `the letter a, the
|
|
* character -, and the letter a'.
|
|
*
|
|
* For compatibility, the `-' is not considerd
|
|
* to define a range if the character following
|
|
* it is either a close bracket (required by ANSI)
|
|
* or is not numerically greater than the character
|
|
* we just stored in the table (c).
|
|
*/
|
|
n = *fmt;
|
|
if (n == ']' || n < c) {
|
|
c = '-';
|
|
break; /* resume the for(;;) */
|
|
}
|
|
fmt++;
|
|
do { /* fill in the range */
|
|
tab[++c] = v;
|
|
} while (c < n);
|
|
#if 1 /* XXX another disgusting compatibility hack */
|
|
/*
|
|
* Alas, the V7 Unix scanf also treats formats
|
|
* such as [a-c-e] as `the letters a through e'.
|
|
* This too is permitted by the standard....
|
|
*/
|
|
goto doswitch;
|
|
#else
|
|
c = *fmt++;
|
|
if (c == 0)
|
|
return (fmt - 1);
|
|
if (c == ']')
|
|
return (fmt);
|
|
#endif
|
|
break;
|
|
|
|
case ']': /* end of scanset */
|
|
return (fmt);
|
|
|
|
default: /* just another character */
|
|
c = n;
|
|
break;
|
|
}
|
|
}
|
|
/* NOTREACHED */
|
|
}
|