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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/***
*sscanf_s.c - read formatted data from string
*
*
*Purpose:
* defines scanf() - reads formatted data from string
*
*******************************************************************************/
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "internal_securecrt.h"
#include "mbusafecrt_internal.h"
typedef int (*INPUTFN)(miniFILE *, const unsigned char*, va_list);
typedef int (*WINPUTFN)(miniFILE *, const wchar_t*, va_list);
extern size_t PAL_wcsnlen(const WCHAR* inString, size_t inMaxSize);
/***
*static int v[nw]scan_fn([w]inputfn, string, [count], format, ...)
*
*Purpose:
* this is a helper function which is called by the other functions
* in this file - sscanf/swscanf/snscanf etc. It calls either _(w)input or
* _(w)input_s depending on the first parameter.
*
*******************************************************************************/
static int __cdecl vscan_fn (
INPUTFN inputfn,
const char *string,
const char *format,
va_list arglist
)
{
miniFILE str;
miniFILE *infile = &str;
int retval;
size_t count = strlen(string);
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if(count>(INT_MAX/sizeof(char)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(char);
}
retval = (inputfn(infile, ( const unsigned char* )format, arglist));
return(retval);
}
static int __cdecl vnscan_fn (
INPUTFN inputfn,
const char *string,
size_t count,
const char *format,
va_list arglist
)
{
miniFILE str;
miniFILE *infile = &str;
int retval;
size_t length = strlen(string);
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if ( count > length )
{
count = length;
}
if(count>(INT_MAX/sizeof(char)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(char);
}
retval = (inputfn(infile, ( const unsigned char* )format, arglist));
return(retval);
}
static int __cdecl vwscan_fn (
WINPUTFN inputfn,
const wchar_t *string,
const wchar_t *format,
va_list arglist
)
{
miniFILE str;
miniFILE *infile = &str;
int retval;
size_t count = PAL_wcsnlen(string, INT_MAX);
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if(count>(INT_MAX/sizeof(wchar_t)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(wchar_t);
}
retval = (inputfn(infile, format, arglist));
return(retval);
}
static int __cdecl vnwscan_fn (
WINPUTFN inputfn,
const wchar_t *string,
size_t count,
const wchar_t *format,
va_list arglist
)
{
miniFILE str;
miniFILE *infile = &str;
int retval;
size_t length = PAL_wcsnlen(string, INT_MAX);
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if ( count > length )
{
count = length;
}
if(count>(INT_MAX/sizeof(wchar_t)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(wchar_t);
}
retval = (inputfn(infile, format, arglist));
return(retval);
}
/***
*int sscanf_s(string, format, ...)
* Same as sscanf above except that it calls _input_s to do the real work.
*
*int snscanf_s(string, size, format, ...)
* Same as snscanf above except that it calls _input_s to do the real work.
*
* _input_s has a size check for array parameters.
*
*******************************************************************************/
int __cdecl sscanf_s (
const char *string,
const char *format,
...
)
{
int ret;
va_list arglist;
va_start(arglist, format);
ret = vscan_fn(__tinput_s, string, format, arglist);
va_end(arglist);
return ret;
}
int __cdecl _snscanf_s (
const char *string,
size_t count,
const char *format,
...
)
{
int ret;
va_list arglist;
va_start(arglist, format);
ret = vnscan_fn(__tinput_s, string, count, format, arglist);
va_end(arglist);
return ret;
}
int __cdecl swscanf_s (
const wchar_t *string,
const wchar_t *format,
...
)
{
int ret;
va_list arglist;
va_start(arglist, format);
ret = vwscan_fn(__twinput_s, string, format, arglist);
va_end(arglist);
return ret;
}
int __cdecl _snwscanf_s (
const wchar_t *string,
size_t count,
const wchar_t *format,
...
)
{
int ret;
va_list arglist;
va_start(arglist, format);
ret = vnwscan_fn(__twinput_s, string, count, format, arglist);
va_end(arglist);
return ret;
}
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