823 lines
20 KiB
C
823 lines
20 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include "../locale/localeinfo.h"
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#include <errno.h>
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#include <limits.h>
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#include <ctype.h>
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#include <stdarg.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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#ifdef __GNUC__
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#define HAVE_LONGLONG
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#define LONGLONG long long
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#else
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#define LONGLONG long
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#endif
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/* Those are flags in the conversion format. */
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# define LONG 0x001 /* l: long or double */
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# define LONGDBL 0x002 /* L: long long or long double */
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# define SHORT 0x004 /* h: short */
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# define SUPPRESS 0x008 /* *: suppress assignment */
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# define POINTER 0x010 /* weird %p pointer (`fake hex') */
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# define NOSKIP 0x020 /* do not skip blanks */
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# define WIDTH 0x040 /* width was given */
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# define GROUP 0x080 /* ': group numbers */
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# define MALLOC 0x100 /* a: malloc strings */
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# define TYPEMOD (LONG|LONGDBL|SHORT)
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#ifdef USE_IN_LIBIO
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# include <libioP.h>
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# include <libio.h>
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# define va_list _IO_va_list
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# define ungetc(c, s) _IO_ungetc (c, s)
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# define inchar() ((c = _IO_getc_unlocked (s)), (void) ++read_in, c)
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# define conv_error() do { \
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if (errp != NULL) *errp |= 2; \
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if (c != EOF) _IO_ungetc (c, s); \
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_IO_funlockfile (s); \
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return done; \
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} while (0)
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# define input_error() do { \
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_IO_funlockfile (s); \
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if (errp != NULL) *errp |= 1; \
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return done ?: EOF; \
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} while (0)
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# define memory_error() do { \
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_IO_funlockfile (s); \
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errno = ENOMEM; \
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return EOF; \
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} while (0)
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# define ARGCHECK(s, format) \
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do \
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{ \
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/* Check file argument for consistence. */ \
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CHECK_FILE (s, EOF); \
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if (s->_flags & _IO_NO_READS || format == NULL) \
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{ \
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MAYBE_SET_EINVAL; \
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return EOF; \
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} \
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} while (0)
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#else
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# define inchar() ((c = getc (s)), (void) ++read_in, c)
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# define conv_error() do { \
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funlockfile (s); \
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ungetc (c, s); \
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return done; \
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} while (0)
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# define input_error() do { \
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funlockfile (s); \
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return done ?: EOF; \
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} while (0)
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# define memory_error() do { \
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funlockfile (s); \
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errno = ENOMEM; \
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return EOF; \
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} while (0)
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# define ARGCHECK(s, format) \
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do \
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{ \
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/* Check file argument for consistence. */ \
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if (!__validfp (s) || !s->__mode.__read || format == NULL) \
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{ \
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errno = EINVAL; \
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return EOF; \
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} \
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} while (0)
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# define flockfile(S) /* nothing */
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# define funlockfile(S) /* nothing */
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#endif
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/* Read formatted input from S according to the format string
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FORMAT, using the argument list in ARG.
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Return the number of assignments made, or -1 for an input error. */
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#ifdef USE_IN_LIBIO
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int
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_IO_vfscanf (s, format, argptr, errp)
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_IO_FILE *s;
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const char *format;
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_IO_va_list argptr;
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int *errp;
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#else
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int
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__vfscanf (FILE *s, const char *format, va_list argptr)
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#endif
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{
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va_list arg = (va_list) argptr;
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register const char *f = format;
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register unsigned char fc; /* Current character of the format. */
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register size_t done = 0; /* Assignments done. */
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register size_t read_in = 0; /* Chars read in. */
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register int c; /* Last char read. */
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register int width; /* Maximum field width. */
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register int flags; /* Modifiers for current format element. */
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/* Status for reading F-P nums. */
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char got_dot, got_e, negative;
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/* If a [...] is a [^...]. */
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char not_in;
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/* Base for integral numbers. */
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int base;
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/* Signedness for integral numbers. */
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int number_signed;
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/* Decimal point character. */
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wchar_t decimal;
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/* The thousands character of the current locale. */
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wchar_t thousands;
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/* Integral holding variables. */
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union
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{
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long long int q;
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unsigned long long int uq;
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long int l;
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unsigned long int ul;
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} num;
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/* Character-buffer pointer. */
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register char *str, **strptr;
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size_t strsize;
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/* We must not react on white spaces immediately because they can
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possibly be matched even if in the input stream no character is
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available anymore. */
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int skip_space = 0;
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/* Workspace. */
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char *tw; /* Temporary pointer. */
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char *wp = NULL; /* Workspace. */
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size_t wpmax = 0; /* Maximal size of workspace. */
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size_t wpsize; /* Currently used bytes in workspace. */
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#define ADDW(Ch) \
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do \
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{ \
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if (wpsize == wpmax) \
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{ \
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char *old = wp; \
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wpmax = UCHAR_MAX > 2 * wpmax ? UCHAR_MAX : 2 * wpmax; \
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wp = (char *) alloca (wpmax); \
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if (old != NULL) \
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memcpy (wp, old, wpsize); \
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} \
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wp[wpsize++] = (Ch); \
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} \
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while (0)
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ARGCHECK (s, format);
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/* Figure out the decimal point character. */
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if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
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strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
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decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
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/* Figure out the thousands separator character. */
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if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
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strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
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thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
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/* Lock the stream. */
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flockfile (s);
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c = inchar ();
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/* Run through the format string. */
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while (*f != '\0')
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{
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unsigned int argpos;
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/* Extract the next argument, which is of type TYPE.
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For a %N$... spec, this is the Nth argument from the beginning;
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otherwise it is the next argument after the state now in ARG. */
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#if 0
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/* XXX Possible optimization. */
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# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
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({ va_list arg = (va_list) argptr; \
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arg = (va_list) ((char *) arg \
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+ (argpos - 1) \
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* __va_rounded_size (void *)); \
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va_arg (arg, type); \
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}))
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#else
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# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
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({ unsigned int pos = argpos; \
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va_list arg = (va_list) argptr; \
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while (--pos > 0) \
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(void) va_arg (arg, void *); \
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va_arg (arg, type); \
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}))
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#endif
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if (!isascii (*f))
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{
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/* Non-ASCII, may be a multibyte. */
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int len = mblen (f, strlen (f));
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if (len > 0)
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{
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while (len-- > 0)
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if (c == EOF)
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input_error ();
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else if (c == *f++)
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(void) inchar ();
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else
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conv_error ();
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continue;
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}
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}
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fc = *f++;
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if (fc != '%')
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{
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/* Remember to skip spaces. */
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if (isspace (fc))
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{
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skip_space = 1;
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continue;
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}
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/* Characters other than format specs must just match. */
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if (c == EOF)
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input_error ();
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/* We saw white space char as the last character in the format
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string. Now it's time to skip all leading white space. */
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if (skip_space)
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{
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while (isspace (c))
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(void) inchar ();
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skip_space = 0;
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}
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if (c == fc)
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(void) inchar ();
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else
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conv_error ();
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continue;
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}
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/* This is the start of the conversion string. */
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flags = 0;
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/* Initialize state of modifiers. */
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argpos = 0;
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/* Prepare temporary buffer. */
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wpsize = 0;
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/* Check for a positional parameter specification. */
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if (isdigit (*f))
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{
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argpos = *f++ - '0';
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while (isdigit (*f))
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argpos = argpos * 10 + (*f++ - '0');
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if (*f == '$')
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++f;
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else
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{
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/* Oops; that was actually the field width. */
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width = argpos;
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flags |= WIDTH;
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argpos = 0;
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goto got_width;
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}
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}
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/* Check for the assignment-suppressant and the number grouping flag. */
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while (*f == '*' || *f == '\'')
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switch (*f++)
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{
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case '*':
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flags |= SUPPRESS;
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break;
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case '\'':
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flags |= GROUP;
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break;
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}
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/* We have seen width. */
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if (isdigit (*f))
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flags |= WIDTH;
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/* Find the maximum field width. */
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width = 0;
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while (isdigit (*f))
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{
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width *= 10;
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width += *f++ - '0';
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}
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got_width:
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if (width == 0)
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width = -1;
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/* Check for type modifiers. */
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while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a' || *f == 'q')
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switch (*f++)
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{
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case 'h':
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/* int's are short int's. */
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if (flags & TYPEMOD)
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/* Signal illegal format element. */
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conv_error ();
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flags |= SHORT;
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break;
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case 'l':
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if (flags & (SHORT|LONGDBL))
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conv_error ();
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else if (flags & LONG)
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{
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/* A double `l' is equivalent to an `L'. */
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flags &= ~LONG;
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flags |= LONGDBL;
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}
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else
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/* int's are long int's. */
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flags |= LONG;
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break;
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case 'q':
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case 'L':
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/* double's are long double's, and int's are long long int's. */
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if (flags & TYPEMOD)
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/* Signal illegal format element. */
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conv_error ();
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flags |= LONGDBL;
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break;
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case 'a':
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if (flags & TYPEMOD)
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/* Signal illegal format element. */
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conv_error ();
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/* String conversions (%s, %[) take a `char **'
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arg and fill it in with a malloc'd pointer. */
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flags |= MALLOC;
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break;
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}
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|
|
/* End of the format string? */
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if (*f == '\0')
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conv_error ();
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|
|
|
/* Find the conversion specifier. */
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fc = *f++;
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if (skip_space || (fc != '[' && fc != 'c' && fc != 'n'))
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{
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/* Eat whitespace. */
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while (isspace (c))
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(void) inchar ();
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skip_space = 0;
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}
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switch (fc)
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{
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case '%': /* Must match a literal '%'. */
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if (c != fc)
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conv_error ();
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inchar ();
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break;
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|
case 'n': /* Answer number of assignments done. */
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|
/* Corrigendum 1 to ISO C 1990 describes the allowed flags
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with the 'n' conversion specifier. */
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if (!(flags & SUPPRESS))
|
|
/* Don't count the read-ahead. */
|
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if (flags & LONGDBL)
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*ARG (long long int *) = read_in - 1;
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else if (flags & LONG)
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*ARG (long int *) = read_in - 1;
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else if (flags & SHORT)
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*ARG (short int *) = read_in - 1;
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else
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*ARG (int *) = read_in - 1;
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break;
|
|
|
|
case 'c': /* Match characters. */
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if (!(flags & SUPPRESS))
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{
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str = ARG (char *);
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if (str == NULL)
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conv_error ();
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|
}
|
|
|
|
if (c == EOF)
|
|
input_error ();
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|
|
|
if (width == -1)
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|
width = 1;
|
|
|
|
if (!(flags & SUPPRESS))
|
|
{
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|
do
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|
*str++ = c;
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while (inchar () != EOF && --width > 0);
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|
}
|
|
else
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|
while (inchar () != EOF && --width > 0);
|
|
|
|
if (!(flags & SUPPRESS))
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|
++done;
|
|
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|
break;
|
|
|
|
case 's': /* Read a string. */
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|
#define STRING_ARG \
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|
if (!(flags & SUPPRESS)) \
|
|
{ \
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|
if (flags & MALLOC) \
|
|
{ \
|
|
/* The string is to be stored in a malloc'd buffer. */ \
|
|
strptr = ARG (char **); \
|
|
if (strptr == NULL) \
|
|
conv_error (); \
|
|
/* Allocate an initial buffer. */ \
|
|
strsize = 100; \
|
|
*strptr = str = malloc (strsize); \
|
|
} \
|
|
else \
|
|
str = ARG (char *); \
|
|
if (str == NULL) \
|
|
conv_error (); \
|
|
}
|
|
STRING_ARG;
|
|
|
|
if (c == EOF)
|
|
input_error ();
|
|
|
|
do
|
|
{
|
|
if (isspace (c))
|
|
break;
|
|
#define STRING_ADD_CHAR(c) \
|
|
if (!(flags & SUPPRESS)) \
|
|
{ \
|
|
*str++ = c; \
|
|
if ((flags & MALLOC) && str == *strptr + strsize) \
|
|
{ \
|
|
/* Enlarge the buffer. */ \
|
|
str = realloc (*strptr, strsize * 2); \
|
|
if (str == NULL) \
|
|
{ \
|
|
/* Can't allocate that much. Last-ditch effort. */\
|
|
str = realloc (*strptr, strsize + 1); \
|
|
if (str == NULL) \
|
|
{ \
|
|
/* We lose. Oh well. \
|
|
Terminate the string and stop converting, \
|
|
so at least we don't skip any input. */ \
|
|
(*strptr)[strsize] = '\0'; \
|
|
++done; \
|
|
conv_error (); \
|
|
} \
|
|
else \
|
|
{ \
|
|
*strptr = str; \
|
|
str += strsize; \
|
|
++strsize; \
|
|
} \
|
|
} \
|
|
else \
|
|
{ \
|
|
*strptr = str; \
|
|
str += strsize; \
|
|
strsize *= 2; \
|
|
} \
|
|
} \
|
|
}
|
|
STRING_ADD_CHAR (c);
|
|
} while (inchar () != EOF && (width <= 0 || --width > 0));
|
|
|
|
if (!(flags & SUPPRESS))
|
|
{
|
|
*str = '\0';
|
|
++done;
|
|
}
|
|
break;
|
|
|
|
case 'x': /* Hexadecimal integer. */
|
|
case 'X': /* Ditto. */
|
|
base = 16;
|
|
number_signed = 0;
|
|
goto number;
|
|
|
|
case 'o': /* Octal integer. */
|
|
base = 8;
|
|
number_signed = 0;
|
|
goto number;
|
|
|
|
case 'u': /* Unsigned decimal integer. */
|
|
base = 10;
|
|
number_signed = 0;
|
|
goto number;
|
|
|
|
case 'd': /* Signed decimal integer. */
|
|
base = 10;
|
|
number_signed = 1;
|
|
goto number;
|
|
|
|
case 'i': /* Generic number. */
|
|
base = 0;
|
|
number_signed = 1;
|
|
|
|
number:
|
|
if (c == EOF)
|
|
input_error ();
|
|
|
|
/* Check for a sign. */
|
|
if (c == '-' || c == '+')
|
|
{
|
|
ADDW (c);
|
|
if (width > 0)
|
|
--width;
|
|
(void) inchar ();
|
|
}
|
|
|
|
/* Look for a leading indication of base. */
|
|
if (width != 0 && c == '0')
|
|
{
|
|
if (width > 0)
|
|
--width;
|
|
|
|
ADDW (c);
|
|
(void) inchar ();
|
|
|
|
if (width != 0 && tolower (c) == 'x')
|
|
{
|
|
if (base == 0)
|
|
base = 16;
|
|
if (base == 16)
|
|
{
|
|
if (width > 0)
|
|
--width;
|
|
(void) inchar ();
|
|
}
|
|
}
|
|
else if (base == 0)
|
|
base = 8;
|
|
}
|
|
|
|
if (base == 0)
|
|
base = 10;
|
|
|
|
/* Read the number into workspace. */
|
|
while (c != EOF && width != 0)
|
|
{
|
|
if (base == 16 ? !isxdigit (c) :
|
|
((!isdigit (c) || c - '0' >= base) &&
|
|
!((flags & GROUP) && base == 10 && c == thousands)))
|
|
break;
|
|
ADDW (c);
|
|
if (width > 0)
|
|
--width;
|
|
|
|
(void) inchar ();
|
|
}
|
|
|
|
if (wpsize == 0 ||
|
|
(wpsize == 1 && (wp[0] == '+' || wp[0] == '-')))
|
|
/* There was no number. */
|
|
conv_error ();
|
|
|
|
/* Convert the number. */
|
|
ADDW ('\0');
|
|
if (flags & LONGDBL)
|
|
{
|
|
if (number_signed)
|
|
num.q = __strtoq_internal (wp, &tw, base, flags & GROUP);
|
|
else
|
|
num.uq = __strtouq_internal (wp, &tw, base, flags & GROUP);
|
|
}
|
|
else
|
|
{
|
|
if (number_signed)
|
|
num.l = __strtol_internal (wp, &tw, base, flags & GROUP);
|
|
else
|
|
num.ul = __strtoul_internal (wp, &tw, base, flags & GROUP);
|
|
}
|
|
if (wp == tw)
|
|
conv_error ();
|
|
|
|
if (!(flags & SUPPRESS))
|
|
{
|
|
if (! number_signed)
|
|
{
|
|
if (flags & LONGDBL)
|
|
*ARG (unsigned LONGLONG int *) = num.uq;
|
|
else if (flags & LONG)
|
|
*ARG (unsigned long int *) = num.ul;
|
|
else if (flags & SHORT)
|
|
*ARG (unsigned short int *)
|
|
= (unsigned short int) num.ul;
|
|
else
|
|
*ARG (unsigned int *) = (unsigned int) num.ul;
|
|
}
|
|
else
|
|
{
|
|
if (flags & LONGDBL)
|
|
*ARG (LONGLONG int *) = num.q;
|
|
else if (flags & LONG)
|
|
*ARG (long int *) = num.l;
|
|
else if (flags & SHORT)
|
|
*ARG (short int *) = (short int) num.l;
|
|
else
|
|
*ARG (int *) = (int) num.l;
|
|
}
|
|
++done;
|
|
}
|
|
break;
|
|
|
|
case 'e': /* Floating-point numbers. */
|
|
case 'E':
|
|
case 'f':
|
|
case 'g':
|
|
case 'G':
|
|
if (c == EOF)
|
|
input_error ();
|
|
|
|
/* Check for a sign. */
|
|
if (c == '-' || c == '+')
|
|
{
|
|
negative = c == '-';
|
|
if (inchar () == EOF)
|
|
/* EOF is only an input error before we read any chars. */
|
|
conv_error ();
|
|
if (width > 0)
|
|
--width;
|
|
}
|
|
else
|
|
negative = 0;
|
|
|
|
got_dot = got_e = 0;
|
|
do
|
|
{
|
|
if (isdigit (c))
|
|
ADDW (c);
|
|
else if (got_e && wp[wpsize - 1] == 'e'
|
|
&& (c == '-' || c == '+'))
|
|
ADDW (c);
|
|
else if (wpsize > 0 && !got_e && tolower (c) == 'e')
|
|
{
|
|
ADDW ('e');
|
|
got_e = got_dot = 1;
|
|
}
|
|
else if (c == decimal && !got_dot)
|
|
{
|
|
ADDW (c);
|
|
got_dot = 1;
|
|
}
|
|
else if ((flags & GROUP) && c == thousands && !got_dot)
|
|
ADDW (c);
|
|
else
|
|
break;
|
|
if (width > 0)
|
|
--width;
|
|
}
|
|
while (inchar () != EOF && width != 0);
|
|
|
|
if (wpsize == 0)
|
|
conv_error ();
|
|
|
|
/* Convert the number. */
|
|
ADDW ('\0');
|
|
if (flags & LONGDBL)
|
|
{
|
|
long double d = __strtold_internal (wp, &tw, flags & GROUP);
|
|
if (!(flags & SUPPRESS) && tw != wp)
|
|
*ARG (long double *) = negative ? -d : d;
|
|
}
|
|
else if (flags & LONG)
|
|
{
|
|
double d = __strtod_internal (wp, &tw, flags & GROUP);
|
|
if (!(flags & SUPPRESS) && tw != wp)
|
|
*ARG (double *) = negative ? -d : d;
|
|
}
|
|
else
|
|
{
|
|
float d = __strtof_internal (wp, &tw, flags & GROUP);
|
|
if (!(flags & SUPPRESS) && tw != wp)
|
|
*ARG (float *) = negative ? -d : d;
|
|
}
|
|
|
|
if (tw == wp)
|
|
conv_error ();
|
|
|
|
if (!(flags & SUPPRESS))
|
|
++done;
|
|
break;
|
|
|
|
case '[': /* Character class. */
|
|
STRING_ARG;
|
|
|
|
if (c == EOF)
|
|
input_error();
|
|
|
|
if (*f == '^')
|
|
{
|
|
++f;
|
|
not_in = 1;
|
|
}
|
|
else
|
|
not_in = 0;
|
|
|
|
/* Fill WP with byte flags indexed by character.
|
|
We will use this flag map for matching input characters. */
|
|
if (wpmax < UCHAR_MAX)
|
|
{
|
|
wpmax = UCHAR_MAX;
|
|
wp = (char *) alloca (wpmax);
|
|
}
|
|
memset (wp, 0, UCHAR_MAX);
|
|
|
|
fc = *f;
|
|
if (fc == ']' || fc == '-')
|
|
{
|
|
/* If ] or - appears before any char in the set, it is not
|
|
the terminator or separator, but the first char in the
|
|
set. */
|
|
wp[fc] = 1;
|
|
++f;
|
|
}
|
|
|
|
while ((fc = *f++) != '\0' && fc != ']')
|
|
{
|
|
if (fc == '-' && *f != '\0' && *f != ']' &&
|
|
(unsigned char) f[-2] <= (unsigned char) *f)
|
|
{
|
|
/* Add all characters from the one before the '-'
|
|
up to (but not including) the next format char. */
|
|
for (fc = f[-2]; fc < *f; ++fc)
|
|
wp[fc] = 1;
|
|
}
|
|
else
|
|
/* Add the character to the flag map. */
|
|
wp[fc] = 1;
|
|
}
|
|
if (fc == '\0')
|
|
conv_error();
|
|
|
|
num.ul = read_in;
|
|
do
|
|
{
|
|
if (wp[c] == not_in)
|
|
break;
|
|
STRING_ADD_CHAR (c);
|
|
if (width > 0)
|
|
--width;
|
|
}
|
|
while (inchar () != EOF && width != 0);
|
|
if (read_in == num.ul)
|
|
conv_error ();
|
|
|
|
if (!(flags & SUPPRESS))
|
|
{
|
|
*str = '\0';
|
|
++done;
|
|
}
|
|
break;
|
|
|
|
case 'p': /* Generic pointer. */
|
|
base = 16;
|
|
/* A PTR must be the same size as a `long int'. */
|
|
flags &= ~(SHORT|LONGDBL);
|
|
flags |= LONG;
|
|
number_signed = 0;
|
|
goto number;
|
|
}
|
|
}
|
|
|
|
/* The last thing we saw int the format string was a white space.
|
|
Consume the last white spaces. */
|
|
if (skip_space)
|
|
while (isspace (c))
|
|
(void) inchar ();
|
|
|
|
/* Unlock stream. */
|
|
funlockfile (s);
|
|
|
|
return ((void) (c == EOF || ungetc (c, s)), done);
|
|
}
|
|
|
|
#ifdef USE_IN_LIBIO
|
|
int
|
|
__vfscanf (FILE *s, const char *format, va_list argptr)
|
|
{
|
|
return _IO_vfscanf (s, format, argptr, NULL);
|
|
}
|
|
#endif
|
|
|
|
weak_alias (__vfscanf, vfscanf)
|