112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
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/***
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*vswprint.c - print formatted data into a string from var arg list
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*
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* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines vswprintf() and _vsnwprintf() - print formatted output to
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* a string, get the data from an argument ptr instead of explicit
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* arguments.
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*
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*Revision History:
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* 05-16-92 KRS Created from vsprintf.c.
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* 02-18-93 SRW Make FILE a local and remove lock usage.
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*
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*******************************************************************************/
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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 <assert.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 <os2dll.h>
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#define MAXSTR INT_MAX
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/***
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#ifndef _COUNT_
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*int vswprintf(string, format, ap) - print formatted data to string from arg ptr
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#else
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*int _vsnwprintf(string, format, ap) - print formatted data to string from arg ptr
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#endif
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*
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*Purpose:
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* Prints formatted data, but to a string and gets data from an argument
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* pointer.
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* Sets up a FILE so file i/o operations can be used, make string look
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* like a huge buffer to it, but _flsbuf will refuse to flush it if it
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* fills up. Appends '\0' to make it a true string.
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*
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* Allocate the 'fake' _iob[] entryit statically instead of on
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* the stack so that other routines can assume that _iob[] entries are in
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* are in DGROUP and, thus, are near.
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*
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#ifdef _COUNT_
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* The _vsnwprintf() flavor takes a count argument that is
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* the max number of bytes 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 never try
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* to get the stream lock (i.e., there is no stream lock either). (2)
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* Also, since there is only one staticly allocated 'fake' iob, we must
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* lock/unlock to prevent collisions.
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*
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*Entry:
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* wchar_t *string - place to put destination string
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#ifdef _COUNT_
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* size_t count - max number of bytes to put in buffer
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#endif
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* wchar_t *format - format string, describes format of data
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* va_list ap - varargs argument pointer
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*
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*Exit:
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* returns number of wide characters in string
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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 _CALLTYPE1 vswprintf (
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wchar_t *string,
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const wchar_t *format,
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va_list ap
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)
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#else
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int _CALLTYPE1 _vsnwprintf (
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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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va_list ap
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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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REG2 int retval;
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assert(string != NULL);
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assert(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 = count*sizeof(wchar_t);
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#endif
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retval = _woutput(outfile,format,ap );
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_putc_lk('\0',outfile); /* no-lock version */
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_putc_lk('\0',outfile); /* 2nd byte for wide char version */
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return(retval);
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}
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