175 lines
5.2 KiB
C
175 lines
5.2 KiB
C
/***
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*vsprintf.c - print formatted data into a string from var arg list
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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 vsprintf() and _vsnprintf() - 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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* 09-02-83 RN original sprintf
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* 06-17-85 TC rewrote to use new varargs macros, and to be vsprintf
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* 04-13-87 JCR added const to declaration
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* 11-07-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-27-88 PHG Merged DLL and normal versions
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* 06-13-88 JCR Fake _iob entry is now static so that other routines
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* can assume _iob entries are in DGROUP.
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* 08-25-88 GJF Define MAXSTR to be INT_MAX (from LIMITS.H).
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* 06-06-89 JCR 386 mthread support
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* 08-18-89 GJF Clean up, now specific to OS/2 2.0 (i.e., 386 flat
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* model). Also fixed copyright and indents.
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* 02-16-90 GJF Fixed copyright
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* 03-20-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 07-25-90 SBM Replaced <assertm.h> by <assert.h>, <varargs.h> by
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* <stdarg.h>
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* 10-03-90 GJF New-style function declarator.
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* 09-24-91 JCR Added _vsnprintf()
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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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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* 03-10-00 GB Added support for knowing the length of formatted
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* string by passing NULL for input string.
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* 03-16-00 GB Added _vscprintf()
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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 <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 vsprintf(string, format, ap) - print formatted data to string from arg ptr
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*else
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*int _vsnprintf(string, cnt, 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 _vsnprintf() 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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* char *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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* char *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 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 __cdecl vsprintf (
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char *string,
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const char *format,
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va_list ap
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)
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#else
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int __cdecl _vsnprintf (
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char *string,
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size_t count,
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const char *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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_ASSERTE(format != NULL);
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#ifndef _COUNT_
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_ASSERTE(string != NULL);
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outfile->_cnt = MAXSTR;
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#else
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outfile->_cnt = (int)count;
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#endif
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outfile->_flag = _IOWRT|_IOSTRG;
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outfile->_ptr = outfile->_base = string;
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retval = _output(outfile,format,ap );
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if ( string!=NULL)
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_putc_lk('\0',outfile);
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return(retval);
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}
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/***
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* _vscprintf() - 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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* char *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 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 _vscprintf (
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const char *format,
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va_list ap
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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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REG2 int retval;
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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 = _output(outfile,format,ap);
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return(retval);
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}
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#endif
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