Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 553 | serge | 1 | /**************************************************************************** |
| 2 | * |
||
| 3 | * Open Watcom Project |
||
| 4 | * |
||
| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
||
| 6 | * |
||
| 7 | * ======================================================================== |
||
| 8 | * |
||
| 9 | * This file contains Original Code and/or Modifications of Original |
||
| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
||
| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
||
| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
||
| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
||
| 14 | * provided with the Original Code and Modifications, and is also |
||
| 15 | * available at www.sybase.com/developer/opensource. |
||
| 16 | * |
||
| 17 | * The Original Code and all software distributed under the License are |
||
| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
||
| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
||
| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
||
| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
||
| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
||
| 23 | * governing rights and limitations under the License. |
||
| 24 | * |
||
| 25 | * ======================================================================== |
||
| 26 | * |
||
| 27 | * Description: Implementation of snprintf_s() - safe string fmt'd output. |
||
| 28 | * |
||
| 29 | ****************************************************************************/ |
||
| 30 | |||
| 31 | |||
| 32 | #include "variety.h" |
||
| 33 | #include "saferlib.h" |
||
| 34 | #include "widechar.h" |
||
| 35 | #include |
||
| 36 | #include |
||
| 37 | #include |
||
| 38 | #include "printf.h" |
||
| 39 | |||
| 40 | |||
| 41 | struct buf_limit { |
||
| 42 | CHAR_TYPE *bufptr; |
||
| 43 | rsize_t chars_output; |
||
| 44 | rsize_t max_chars; |
||
| 45 | }; |
||
| 46 | |||
| 47 | /* |
||
| 48 | * buf_putc -- append a character to a string in memory |
||
| 49 | */ |
||
| 50 | static slib_callback_t buf_putc; // setup calling convention |
||
| 51 | static void __SLIB_CALLBACK buf_putc( SPECS __SLIB *specs, int op_char ) |
||
| 52 | { |
||
| 53 | struct buf_limit *info; |
||
| 54 | |||
| 55 | info = (struct buf_limit *)specs->_dest; |
||
| 56 | if( specs->_output_count < info->max_chars ) { |
||
| 57 | *( info->bufptr++ ) = op_char; |
||
| 58 | info->chars_output++; |
||
| 59 | } |
||
| 60 | specs->_output_count++; |
||
| 61 | } |
||
| 62 | |||
| 63 | |||
| 64 | _WCRTLINK int __F_NAME(snprintf_s,snwprintf_s)( CHAR_TYPE * __restrict s, rsize_t n, |
||
| 65 | const CHAR_TYPE * __restrict format, ... ) |
||
| 66 | { |
||
| 67 | va_list arg; |
||
| 68 | struct buf_limit info; |
||
| 69 | const char *msg; |
||
| 70 | |||
| 71 | /* First check the critical conditions; if any of those |
||
| 72 | * is violated, return immediately and don't touch anything. |
||
| 73 | */ |
||
| 74 | if( __check_constraint_nullptr_msg( msg, s ) |
||
| 75 | && __check_constraint_maxsize_msg( msg, n ) |
||
| 76 | && __check_constraint_zero_msg( msg, n ) ) { |
||
| 77 | |||
| 78 | /* The buffer looks okay, try doing something useful */ |
||
| 79 | if( __check_constraint_nullptr_msg( msg, format ) ) { |
||
| 80 | int len; |
||
| 81 | |||
| 82 | info.bufptr = s; |
||
| 83 | info.chars_output = 0; |
||
| 84 | info.max_chars = n - 1; |
||
| 85 | msg = NULL; |
||
| 86 | va_start( arg, format ); |
||
| 87 | len = __F_NAME(__prtf_s,__wprtf_s)( &info, format, arg, &msg, buf_putc ); |
||
| 88 | va_end( arg ); |
||
| 89 | if( msg == NULL ) { |
||
| 90 | /* No rt-constraint violation while formatting */ |
||
| 91 | s[info.chars_output] = NULLCHAR; |
||
| 92 | return( len ); |
||
| 93 | } |
||
| 94 | } |
||
| 95 | /* Something went wrong, output buffer will contain empty string */ |
||
| 96 | *s = NULLCHAR; |
||
| 97 | } |
||
| 98 | __rtct_fail( __func__, msg, NULL ); |
||
| 99 | return( -1 ); |
||
| 100 | } |