466 lines
12 KiB
C
466 lines
12 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* Copyright (c) 2012-2014 ARM Ltd
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* All rights reserved.
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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. The name of the company may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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FUNCTION
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<<vfscanf>>, <<vscanf>>, <<vsscanf>>---format argument list
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INDEX
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vfscanf
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INDEX
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_vfscanf_r
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INDEX
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vscanf
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INDEX
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_vscanf_r
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INDEX
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vsscanf
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INDEX
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_vsscanf_r
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SYNOPSIS
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#include <stdio.h>
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#include <stdarg.h>
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int vscanf(const char *<[fmt]>, va_list <[list]>);
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int vfscanf(FILE *<[fp]>, const char *<[fmt]>, va_list <[list]>);
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int vsscanf(const char *<[str]>, const char *<[fmt]>, va_list <[list]>);
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int _vscanf_r(struct _reent *<[reent]>, const char *<[fmt]>,
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va_list <[list]>);
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int _vfscanf_r(struct _reent *<[reent]>, FILE *<[fp]>, const char *<[fmt]>,
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va_list <[list]>);
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int _vsscanf_r(struct _reent *<[reent]>, const char *<[str]>,
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const char *<[fmt]>, va_list <[list]>);
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DESCRIPTION
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<<vscanf>>, <<vfscanf>>, and <<vsscanf>> are (respectively) variants
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of <<scanf>>, <<fscanf>>, and <<sscanf>>. They differ only in
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allowing their caller to pass the variable argument list as a
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<<va_list>> object (initialized by <<va_start>>) rather than
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directly accepting a variable number of arguments.
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RETURNS
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The return values are consistent with the corresponding functions:
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<<vscanf>> returns the number of input fields successfully scanned,
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converted, and stored; the return value does not include scanned
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fields which were not stored.
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If <<vscanf>> attempts to read at end-of-file, the return value
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is <<EOF>>.
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If no fields were stored, the return value is <<0>>.
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The routines <<_vscanf_r>>, <<_vfscanf_f>>, and <<_vsscanf_r>> are
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reentrant versions which take an additional first parameter which points to the
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reentrancy structure.
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PORTABILITY
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These are GNU extensions.
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Supporting OS subroutines required:
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <newlib.h>
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#include <ctype.h>
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#include <wctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <limits.h>
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#include <wchar.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include "local.h"
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#include "../stdlib/local.h"
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#include "nano-vfscanf_local.h"
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#define VFSCANF vfscanf
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#define _VFSCANF_R _vfscanf_r
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#define __SVFSCANF __svfscanf
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#ifdef STRING_ONLY
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# define __SVFSCANF_R __ssvfscanf_r
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#else
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# define __SVFSCANF_R __svfscanf_r
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#endif
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/* vfscanf. */
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#ifndef STRING_ONLY
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#ifndef _REENT_ONLY
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int
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VFSCANF (register FILE *fp,
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const char *fmt,
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va_list ap)
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{
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CHECK_INIT(_REENT, fp);
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return __SVFSCANF_R (_REENT, fp, fmt, ap);
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}
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int
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vfiscanf (FILE *, const char *, __VALIST)
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_ATTRIBUTE ((__alias__("vfscanf")));
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int
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__SVFSCANF (register FILE *fp,
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char const *fmt0,
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va_list ap)
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{
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return __SVFSCANF_R (_REENT, fp, fmt0, ap);
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}
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#endif
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int
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_VFSCANF_R (struct _reent *data,
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register FILE *fp,
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const char *fmt,
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va_list ap)
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{
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CHECK_INIT(data, fp);
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return __SVFSCANF_R (data, fp, fmt, ap);
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}
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int
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_vfiscanf_r (struct _reent *, FILE *, const char *, __VALIST)
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_ATTRIBUTE ((__alias__("_vfscanf_r")));
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#endif /* !STRING_ONLY. */
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#if defined (STRING_ONLY)
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/* When dealing with the sscanf family, we don't want to use the
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regular ungetc which will drag in file I/O items we don't need.
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So, we create our own trimmed-down version. */
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int
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_sungetc_r (struct _reent *data,
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int c,
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register FILE *fp)
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{
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if (c == EOF)
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return (EOF);
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/* After ungetc, we won't be at eof anymore. */
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fp->_flags &= ~__SEOF;
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c = (unsigned char) c;
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/* If we are in the middle of ungetc'ing, just continue.
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This may require expanding the current ungetc buffer. */
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if (HASUB (fp))
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{
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if (fp->_r >= fp->_ub._size && __submore (data, fp))
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return EOF;
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*--fp->_p = c;
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fp->_r++;
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return c;
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}
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/* If we can handle this by simply backing up, do so,
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but never replace the original character.
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(This makes sscanf() work when scanning `const' data). */
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if (fp->_bf._base != NULL && fp->_p > fp->_bf._base && fp->_p[-1] == c)
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{
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fp->_p--;
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fp->_r++;
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return c;
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}
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/* Create an ungetc buffer.
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Initially, we will use the `reserve' buffer. */
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fp->_ur = fp->_r;
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fp->_up = fp->_p;
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fp->_ub._base = fp->_ubuf;
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fp->_ub._size = sizeof (fp->_ubuf);
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fp->_ubuf[sizeof (fp->_ubuf) - 1] = c;
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fp->_p = &fp->_ubuf[sizeof (fp->_ubuf) - 1];
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fp->_r = 1;
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return c;
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}
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/* String only version of __srefill_r for sscanf family. */
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int
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__ssrefill_r (struct _reent * ptr,
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register FILE * fp)
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{
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/* Our only hope of further input is the ungetc buffer.
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If there is anything in that buffer to read, return. */
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if (HASUB (fp))
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{
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FREEUB (ptr, fp);
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if ((fp->_r = fp->_ur) != 0)
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{
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fp->_p = fp->_up;
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return 0;
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}
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}
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/* Otherwise we are out of character input. */
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fp->_p = fp->_bf._base;
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fp->_r = 0;
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fp->_flags |= __SEOF;
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return EOF;
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}
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#else
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int _sungetc_r (struct _reent *, int, register FILE *);
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int __ssrefill_r (struct _reent *, register FILE *);
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size_t _sfread_r (struct _reent *, void *buf, size_t, size_t, FILE *);
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#endif /* !STRING_ONLY. */
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int
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__SVFSCANF_R (struct _reent *rptr,
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register FILE *fp,
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char const *fmt0,
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va_list ap)
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{
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register u_char *fmt = (u_char *) fmt0;
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register int c; /* Character from format, or conversion. */
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register char *p; /* Points into all kinds of strings. */
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char ccltab[256]; /* Character class table for %[...]. */
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va_list ap_copy;
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int ret;
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char *cp;
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struct _scan_data_t scan_data;
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int (*scan_func)(struct _reent*, struct _scan_data_t*, FILE *, va_list *);
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_newlib_flockfile_start (fp);
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scan_data.nassigned = 0;
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scan_data.nread = 0;
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scan_data.ccltab = ccltab;
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scan_data.pfn_ungetc = _ungetc_r;
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scan_data.pfn_refill = __srefill_r;
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/* GCC PR 14577 at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14557 */
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va_copy (ap_copy, ap);
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for (;;)
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{
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if (*fmt == 0)
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goto all_done;
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if (isspace (*fmt))
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{
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while ((fp->_r > 0 || !scan_data.pfn_refill(rptr, fp))
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&& isspace (*fp->_p))
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{
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scan_data.nread++;
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fp->_r--;
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fp->_p++;
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}
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fmt++;
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continue;
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}
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if ((c = *fmt++) != '%')
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goto literal;
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scan_data.width = 0;
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scan_data.flags = 0;
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if (*fmt == '*')
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{
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scan_data.flags |= SUPPRESS;
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fmt++;
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}
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for (; is_digit (*fmt); fmt++)
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scan_data.width = 10 * scan_data.width + to_digit (*fmt);
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/* The length modifiers. */
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p = "hlL";
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if ((cp = memchr (p, *fmt, 3)) != NULL) {
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scan_data.flags |= (SHORT << (cp - p));
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fmt++;
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}
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/* Switch on the format. continue if done; break once format
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type is derived. */
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c = *fmt++;
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switch (c)
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{
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case '%':
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literal:
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if ((fp->_r <= 0 && scan_data.pfn_refill(rptr, 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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scan_data.nread++;
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continue;
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case 'p':
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scan_data.flags |= POINTER;
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case 'x':
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case 'X':
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scan_data.flags |= PFXOK;
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scan_data.base = 16;
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goto number;
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case 'd':
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case 'u':
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scan_data.base = 10;
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goto number;
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case 'i':
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scan_data.base = 0;
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goto number;
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case 'o':
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scan_data.base = 8;
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number:
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scan_data.code = (c < 'o') ? CT_INT : CT_UINT;
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break;
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case '[':
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fmt = (u_char *) __sccl (ccltab, (unsigned char *) fmt);
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scan_data.flags |= NOSKIP;
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scan_data.code = CT_CCL;
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break;
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case 'c':
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scan_data.flags |= NOSKIP;
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scan_data.code = CT_CHAR;
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break;
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case 's':
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scan_data.code = CT_STRING;
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break;
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case 'n':
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if (scan_data.flags & SUPPRESS) /* ??? */
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continue;
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if (scan_data.flags & SHORT)
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*GET_ARG (N, ap_copy, short *) = scan_data.nread;
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else if (scan_data.flags & LONG)
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*GET_ARG (N, ap_copy, long *) = scan_data.nread;
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else
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*GET_ARG (N, ap_copy, int *) = scan_data.nread;
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continue;
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/* Disgusting backwards compatibility hacks. XXX. */
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case '\0': /* compat. */
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_newlib_flockfile_exit (fp);
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va_end (ap_copy);
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return EOF;
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#ifdef FLOATING_POINT
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case 'e': case 'E':
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case 'f': case 'F':
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case 'g': case 'G':
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scan_data.code = CT_FLOAT;
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break;
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#endif
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default: /* compat. */
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scan_data.code = CT_INT;
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scan_data.base = 10;
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break;
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}
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/* We have a conversion that requires input. */
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if ((fp->_r <= 0 && scan_data.pfn_refill (rptr, fp)))
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goto input_failure;
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/* Consume leading white space, except for formats that
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suppress this. */
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if ((scan_data.flags & NOSKIP) == 0)
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{
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while (isspace (*fp->_p))
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{
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scan_data.nread++;
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if (--fp->_r > 0)
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fp->_p++;
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else if (scan_data.pfn_refill (rptr, fp))
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goto input_failure;
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}
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/* Note that there is at least one character in the
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buffer, so conversions that do not set NOSKIP ca
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no longer result in an input failure. */
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}
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ret = 0;
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if (scan_data.code < CT_INT)
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ret = _scanf_chars (rptr, &scan_data, fp, &ap_copy);
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else if (scan_data.code < CT_FLOAT)
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ret = _scanf_i (rptr, &scan_data, fp, &ap_copy);
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#ifdef FLOATING_POINT
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else if (_scanf_float)
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ret = _scanf_float (rptr, &scan_data, fp, &ap_copy);
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#endif
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if (ret == MATCH_FAILURE)
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goto match_failure;
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else if (ret == INPUT_FAILURE)
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goto input_failure;
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}
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input_failure:
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/* On read failure, return EOF failure regardless of matches; errno
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should have been set prior to here. On EOF failure (including
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invalid format string), return EOF if no matches yet, else number
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of matches made prior to failure. */
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_newlib_flockfile_exit (fp);
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va_end (ap_copy);
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return scan_data.nassigned && !(fp->_flags & __SERR) ? scan_data.nassigned
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: EOF;
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match_failure:
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all_done:
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/* Return number of matches, which can be 0 on match failure. */
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_newlib_flockfile_end (fp);
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va_end (ap_copy);
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return scan_data.nassigned;
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}
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#ifdef STRING_ONLY
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int
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__ssvfiscanf_r (struct _reent *, FILE *, const char *, __VALIST)
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_ATTRIBUTE ((__alias__("__ssvfscanf_r")));
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#else
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int
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__svfiscanf_r (struct _reent *, FILE *, const char *, __VALIST)
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_ATTRIBUTE ((__alias__("__svfscanf_r")));
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#endif
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