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