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发表于 2020-7-8 21:30:01
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/***
*sprintf.c - print formatted to string
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines sprintf() and _snprintf() - print formatted data to string
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <stdarg.h>
#include <internal.h>
#include <limits.h>
#include <mtdll.h>
#include <stddef.h>
#define MAXSTR INT_MAX
/***
*ifndef _COUNT_
*int sprintf(string, format, ...) - print formatted data to string
*else
*int _snprintf(string, cnt, format, ...) - print formatted data to string
*endif
*
*Purpose:
* Prints formatted data to the using the format string to
* format data and getting as many arguments as called for
* Sets up a FILE so file i/o operations can be used, make
* string look like a huge buffer to it, but _flsbuf will
* refuse to flush it if it fills up. Appends '\0' to make
* it a true string. _output does the real work here
*
* Allocate the 'fake' _iob[] entry statically instead of on
* the stack so that other routines can assume that _iob[]
* entries are in are in DGROUP and, thus, are near.
*
*ifdef _COUNT_
* The _snprintf() flavor takes a count argument that is
* the max number of bytes that should be written to the
* user's buffer.
*endif
*
* Multi-thread: (1) Since there is no stream, this routine must
* never try to get the stream lock (i.e., there is no stream
* lock either). (2) Also, since there is only one statically
* allocated 'fake' iob, we must lock/unlock to prevent collisions.
*
*Entry:
* char *string - pointer to place to put output
*ifdef _COUNT_
* size_t count - max number of bytes to put in buffer
*endif
* char *format - format string to control data format/number
* of arguments followed by list of arguments, number and type
* controlled by format string
*
*Exit:
* returns number of characters printed
*
*Exceptions:
*
*******************************************************************************/
#ifndef _COUNT_
int __cdecl sprintf (
char *string,
const char *format,
...
)
#else /* _COUNT_ */
#ifndef _SWPRINTFS_ERROR_RETURN_FIX
int __cdecl _snprintf (
char *string,
size_t count,
const char *format,
...
)
#else /* _SWPRINTFS_ERROR_RETURN_FIX */
int __cdecl _snprintf_c (
char *string,
size_t count,
const char *format,
...
)
#endif /* _SWPRINTFS_ERROR_RETURN_FIX */
#endif /* _COUNT_ */
{
FILE str;
REG1 FILE *outfile = &str;
va_list arglist;
REG2 int retval;
_VALIDATE_RETURN( (format != NULL), EINVAL, -1);
#ifdef _COUNT_
_VALIDATE_RETURN( (count == 0) || (string != NULL), EINVAL, -1 );
#else /* _COUNT_ */
_VALIDATE_RETURN( (string != NULL), EINVAL, -1 );
#endif /* _COUNT_ */
va_start(arglist, format);
#ifndef _COUNT_
outfile->_cnt = MAXSTR;
#else /* _COUNT_ */
if(count>INT_MAX)
{
/* old-style functions allow any large value to mean unbounded */
outfile->_cnt = INT_MAX;
}
else
{
outfile->_cnt = (int)(count);
}
#endif /* _COUNT_ */
outfile->_flag = _IOWRT|_IOSTRG;
outfile->_ptr = outfile->_base = string;
retval = _output_l(outfile,format,NULL,arglist);
if (string == NULL)
return(retval);
#ifndef _SWPRINTFS_ERROR_RETURN_FIX
_putc_nolock('\0',outfile); /* no-lock version */
return(retval);
#else /* _SWPRINTFS_ERROR_RETURN_FIX */
if((retval >= 0) && (_putc_nolock('\0',outfile) != EOF))
return(retval);
string[0] = 0;
return -1;
#endif /* _SWPRINTFS_ERROR_RETURN_FIX */
}
#ifndef _COUNT_
int __cdecl _sprintf_l (
char *string,
const char *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#pragma warning(push)
#pragma warning(disable:4996) // Disable deprecation warning since calling function is also deprecated
return _vsprintf_l(string, format, plocinfo, arglist);
#pragma warning(pop)
}
#else /* _COUNT_ */
#ifndef _SWPRINTFS_ERROR_RETURN_FIX
int __cdecl _snprintf_l (
char *string,
size_t count,
const char *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#pragma warning(push)
#pragma warning(disable:4996) // Disable deprecation warning since calling function is also deprecated
return _vsnprintf_l(string, count, format, plocinfo, arglist);
#pragma warning(pop)
}
#else /* _SWPRINTFS_ERROR_RETURN_FIX */
int __cdecl _snprintf_c_l (
char *string,
size_t count,
const char *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
return _vsnprintf_c_l(string, count, format, plocinfo, arglist);
}
#endif /* _SWPRINTFS_ERROR_RETURN_FIX */
#endif /* _COUNT_ */
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