Clib string & memory functions

git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60

programs/develop/open watcom/trunk/clib/string/bprintf.c

@@ -0,0 +1,139 @@
+/****************************************************************************
+*
+*                            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 ) );
+}