safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
vsnprintf_s.c
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1 /*------------------------------------------------------------------
2  * vsnprintf_s_s.c
3  *
4  * August 2017, Reini Urban
5  *
6  * Copyright (c) 2017 by Reini Urban
7  * All rights reserved.
8  *
9  * Permission is hereby granted, free of charge, to any person
10  * obtaining a copy of this software and associated documentation
11  * files (the "Software"), to deal in the Software without
12  * restriction, including without limitation the rights to use,
13  * copy, modify, merge, publish, distribute, sublicense, and/or
14  * sell copies of the Software, and to permit persons to whom the
15  * Software is furnished to do so, subject to the following
16  * conditions:
17  *
18  * The above copyright notice and this permission notice shall be
19  * included in all copies or substantial portions of the Software.
20  *
21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
23  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28  * OTHER DEALINGS IN THE SOFTWARE.
29  *------------------------------------------------------------------
30  */
31 
32 /* Need restrict */
33 #include "config.h"
34 #include "safe_str_lib.h"
35 #include "safe_str_constraint.h"
36 #include <stdarg.h>
37 
38 
86 #include "safeclib_private.h"
87 #include "safe_str_constraint.h"
88 #include "safe_str_lib.h"
89 
90 int vsnprintf_s(char *restrict dest, rsize_t dmax, const char *restrict fmt, va_list ap)
91 {
92 
93  int ret = -1;
94  if (dmax > RSIZE_MAX_STR) {
95  invoke_safe_str_constraint_handler("vsnprintf_s: dmax exceeds max",
96  NULL, ESLEMAX);
97  return RCNEGATE(ESLEMAX);
98  }
99 
100  if (dest == NULL) {
101  invoke_safe_str_constraint_handler("vsnprintf_s: dest is null",
102  NULL, ESNULLP);
103  return RCNEGATE(ESNULLP);
104  }
105 
106  if (fmt == NULL) {
107  invoke_safe_str_constraint_handler("vsnprintf_s: fmt is null",
108  NULL, ESNULLP);
109  return RCNEGATE(ESNULLP);
110  }
111 
112  if (dmax == 0) {
113  invoke_safe_str_constraint_handler("vsnprintf_s: dmax is 0",
114  NULL, ESZEROL);
115  return RCNEGATE(ESZEROL);
116  }
117 
118  ret = vsnprintf(dest, (size_t)dmax, fmt, ap);
119 
120  /*if (ret >= (int)dmax) {
121  invoke_safe_str_constraint_handler("vsnprintf_s: len exceeds dmax",
122  NULL, ESNOSPC);
123  *dest = 0;
124  ret = RCNEGATE(ESNOSPC);
125  }*/
126 
127  return ret;
128 }
int vsnprintf_s(char *restrict dest, rsize_t dmax, const char *restrict fmt, va_list ap)
The vsnprintf_s function composes a string with same test that would be printed if format was used on...
Definition: vsnprintf_s.c:90
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.