/***
*sprintf.c - print formatted to string
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines sprintf() and _snprintf() - print formatted data to string
*
*******************************************************************************/
#include
#include
#include
#include
#include
#include
#include
#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_ */
int __cdecl _snprintf (
char *string,
size_t count,
const char *format,
...
)
#endif /* _COUNT_ */
{
FILE str;
REG1 FILE *outfile = &str;
va_list arglist;
REG2 int retval;
va_start(arglist, format);
_ASSERTE(string != NULL);
_ASSERTE(format != NULL);
outfile->_flag = _IOWRT|_IOSTRG;
outfile->_ptr = outfile->_base = string;
#ifndef _COUNT_
outfile->_cnt = MAXSTR;
#else /* _COUNT_ */
outfile->_cnt = count;
#endif /* _COUNT_ */
retval = _output(outfile,format,arglist);
_putc_lk('\0',outfile); /* no-lock version */
return(retval);
}
