Clib string & memory functions

git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00
parent d5f66e011c
commit 836c97f0ac
162 changed files with 11855 additions and 0 deletions
--- a/watcom/trunk/clib/string/snprtf_s.c
+++ b/watcom/trunk/clib/string/snprtf_s.c
@@ -0,0 +1,100 @@
+/****************************************************************************
+*
+*                            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:  Implementation of snprintf_s() - safe string fmt'd output.
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include "saferlib.h"
+#include "widechar.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+#include "printf.h"
+
+
+struct buf_limit {
+    CHAR_TYPE   *bufptr;
+    rsize_t     chars_output;
+    rsize_t     max_chars;
+};
+
+/*
+ * 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    *info;
+
+    info = (struct buf_limit *)specs->_dest;
+    if( specs->_output_count < info->max_chars ) {
+        *( info->bufptr++ ) = op_char;
+        info->chars_output++;
+    }
+    specs->_output_count++;
+}
+
+
+_WCRTLINK int __F_NAME(snprintf_s,snwprintf_s)( CHAR_TYPE * __restrict s, rsize_t n,
+                                          const CHAR_TYPE * __restrict format, ... )
+{
+    va_list    arg;
+    struct buf_limit    info;
+    const char          *msg;
+
+    /* First check the critical conditions; if any of those
+     * is violated, return immediately and don't touch anything.
+     */
+    if( __check_constraint_nullptr_msg( msg, s )
+     && __check_constraint_maxsize_msg( msg, n )
+     && __check_constraint_zero_msg( msg, n ) ) {
+
+        /* The buffer looks okay, try doing something useful */
+        if( __check_constraint_nullptr_msg( msg, format ) ) {
+            int                 len;
+
+            info.bufptr       = s;
+            info.chars_output = 0;
+            info.max_chars    = n - 1;
+            msg = NULL;
+            va_start( arg, format );
+            len = __F_NAME(__prtf_s,__wprtf_s)( &info, format, arg, &msg, buf_putc );
+            va_end( arg );
+            if( msg == NULL ) {
+                /* No rt-constraint violation while formatting */
+                s[info.chars_output] = NULLCHAR;
+                return( len );
+            }
+        }
+        /* Something went wrong, output buffer will contain empty string */
+        *s = NULLCHAR;
+    }
+    __rtct_fail( __func__, msg, NULL );
+    return( -1 );
+}