kolibrios/programs/develop/open watcom/trunk/clib/string/bprintf.c
Sergey Semyonov (Serge) 836c97f0ac Clib string & memory functions
git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00

140 lines
4.4 KiB
C

/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: This module supports formatted output to a character buffer.
* Both character and wide character formatting are included.
* For added library granularity, this module could be split
* into two, with "bprintf" functions in one file and the
* "snprintf" functions in another.
*
* C library functions:
* _bprintf, _vbprintf
* _bwprintf, _vbwprintf
* _snprintf, _snwprintf
* _vsnprintf, _vsnwprintf
*
****************************************************************************/
#include "variety.h"
#include "widechar.h"
#include <stdio.h>
#include <stdarg.h>
#include "printf.h"
struct buf_limit {
CHAR_TYPE *bufptr;
size_t bufsize;
int bufover;
};
/*
* buf_putc -- append a character to a string in memory
*/
static slib_callback_t buf_putc; // setup calling convention
static void __SLIB_CALLBACK buf_putc( SPECS __SLIB *specs, int op_char )
{
struct buf_limit *bufinfo;
bufinfo = (struct buf_limit *)specs->_dest;
if( specs->_output_count < bufinfo->bufsize ) {
*( bufinfo->bufptr++ ) = op_char;
specs->_output_count++;
} else {
bufinfo->bufover = -1;
}
}
_WCRTLINK int __F_NAME(_vbprintf,_vbwprintf) ( CHAR_TYPE *s, size_t bufsize,
const CHAR_TYPE *format, va_list arg)
{
register int len;
auto struct buf_limit bufinfo;
slib_callback_t *tmp;
bufinfo.bufptr = s;
bufinfo.bufsize = bufsize - 1;
bufinfo.bufover = 0;
#if defined( __386__ ) && defined( __QNX__ )
/* avoid some segment relocations for 32-bit QNX */
tmp = (void (*)())buf_putc;
#else
tmp = buf_putc;
#endif
len = __F_NAME(__prtf,__wprtf)( &bufinfo, format, arg, tmp );
s[len] = '\0';
return( len );
}
_WCRTLINK int __F_NAME(_bprintf,_bwprintf) ( CHAR_TYPE *dest, size_t bufsize,
const CHAR_TYPE *format, ... )
{
auto va_list args;
va_start( args, format );
return( __F_NAME(_vbprintf,_vbwprintf)( dest, bufsize, format, args ) );
}
// Notes:
// _vsnprintf, _vsnwprintf must return an error (-1) when buffer too small
// If a NULL character can fit, append it. If not, no error.
_WCRTLINK int __F_NAME(_vsnprintf,_vsnwprintf) ( CHAR_TYPE *s, size_t bufsize,
const CHAR_TYPE *format, va_list arg)
{
register int len;
auto struct buf_limit bufinfo;
slib_callback_t *tmp;
bufinfo.bufptr = s;
bufinfo.bufsize = bufsize;
bufinfo.bufover = 0;
#if defined( __386__ ) && defined( __QNX__ )
/* avoid some segment relocations for 32-bit QNX */
tmp = (void (*)())buf_putc;
#else
tmp = buf_putc;
#endif
len = __F_NAME(__prtf,__wprtf)( &bufinfo, format, arg, tmp );
if( len < bufsize ) {
s[len] = '\0';
}
if( bufinfo.bufover == 0 ) {
return( len );
} else {
return( -1 );
}
}
_WCRTLINK int __F_NAME(_snprintf,_snwprintf) ( CHAR_TYPE *dest, size_t bufsize,
const CHAR_TYPE *format, ... )
{
auto va_list args;
va_start( args, format );
return( __F_NAME(_vsnprintf,_vsnwprintf)( dest, bufsize, format, args ) );
}