newlib-cygwin/newlib/libc/stdio/nano-vfscanf.c

466 lines
12 KiB
C

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