170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
/***
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*swprintf.c - print formatted to string
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines swprintf() and _snwprintf() - print formatted data to string
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*
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*Revision History:
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* 05-16-92 KRS Created from sprintf.c
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* 02-18-93 SRW Make FILE a local and remove lock usage.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 02-07-94 CFW POSIXify.
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* 09-05-94 SKS Change "#ifdef" inside comments to "*ifdef" to avoid
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* problems with CRTL source release process.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 01-06-99 GJF Changes for 64-bit size_t.
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* 03-16-00 GB Added _scwprintf()
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <dbgint.h>
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#include <stdarg.h>
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#include <internal.h>
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#include <limits.h>
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#include <mtdll.h>
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#define MAXSTR INT_MAX
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/***
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*ifndef _COUNT_
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*int swprintf(string, format, ...) - print formatted data to string
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*else
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*int _snwprintf(string, cnt, format, ...) - print formatted data to string
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*endif
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*
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*Purpose:
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* Prints formatted data to the using the format string to
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* format data and getting as many arguments as called for
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* Sets up a FILE so file i/o operations can be used, make
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* string look like a huge buffer to it, but _flsbuf will
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* refuse to flush it if it fills up. Appends '\0' to make
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* it a true string. _output does the real work here
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*
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* Allocate the 'fake' _iob[] entry statically instead of on
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* the stack so that other routines can assume that _iob[]
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* entries are in are in DGROUP and, thus, are near.
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*
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*ifdef _COUNT_
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* The _snwprintf() flavor takes a count argument that is
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* the max number of wide characters that should be written to the
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* user's buffer.
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*endif
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*
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* Multi-thread: (1) Since there is no stream, this routine must
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* never try to get the stream lock (i.e., there is no stream
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* lock either). (2) Also, since there is only one statically
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* allocated 'fake' iob, we must lock/unlock to prevent collisions.
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*
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*Entry:
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* wchar_t *string - pointer to place to put output
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*ifdef _COUNT_
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* size_t count - max number of wide characters to put in buffer
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*endif
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* wchar_t *format - format string to control data format/number
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* of arguments followed by list of arguments, number and type
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* controlled by format string
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*
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*Exit:
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* returns number of wide characters printed
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifndef _COUNT_
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int __cdecl swprintf (
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wchar_t *string,
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const wchar_t *format,
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...
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)
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#else
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int __cdecl _snwprintf (
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wchar_t *string,
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size_t count,
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const wchar_t *format,
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...
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)
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#endif
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{
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FILE str;
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REG1 FILE *outfile = &str;
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va_list arglist;
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REG2 int retval;
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va_start(arglist, format);
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_ASSERTE(string != NULL);
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_ASSERTE(format != NULL);
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outfile->_flag = _IOWRT|_IOSTRG;
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outfile->_ptr = outfile->_base = (char *) string;
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#ifndef _COUNT_
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outfile->_cnt = MAXSTR;
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#else
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outfile->_cnt = (int)(count*sizeof(wchar_t));
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#endif
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retval = _woutput(outfile,format,arglist);
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_putc_lk('\0',outfile); /* no-lock version */
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_putc_lk('\0',outfile); /* 2nd null byte for wchar_t version */
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return(retval);
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}
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/***
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* _scwprintf() - counts the number of character needed to print the formatted
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* data
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*
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*Purpose:
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* Counts the number of characters in the fotmatted data.
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*
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*Entry:
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* wchar_t *format - format string to control data format/number
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* of arguments followed by list of arguments, number and type
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* controlled by format string
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*
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*Exit:
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* returns number of characters needed to print formatted data.
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifndef _COUNT_
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int __cdecl _scwprintf (
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const wchar_t *format,
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...
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)
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{
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FILE str;
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REG1 FILE *outfile = &str;
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va_list arglist;
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REG2 int retval;
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va_start(arglist, format);
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_ASSERTE(format != NULL);
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outfile->_cnt = MAXSTR;
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outfile->_flag = _IOWRT|_IOSTRG;
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outfile->_ptr = outfile->_base = NULL;
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retval = _woutput(outfile,format,arglist);
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return(retval);
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}
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#endif
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#endif /* _POSIX_ */
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