safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strcmp_s.c
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1 /*------------------------------------------------------------------
2  * strcmp_s.c -- string compare
3  *
4  * November 2008, Bo Berry
5  *
6  * Copyright (c) 2008-2011 by Cisco Systems, Inc
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 #include "safeclib_private.h"
33 #include "safe_str_constraint.h"
34 #include "safe_str_lib.h"
35 
36 
72 errno_t
73 strcmp_s (const char *dest, rsize_t dmax,
74  const char *src, int *indicator)
75 {
76  if (indicator == NULL) {
77  invoke_safe_str_constraint_handler("strcmp_s: indicator is null",
78  NULL, ESNULLP);
79  return RCNEGATE(ESNULLP);
80  }
81  *indicator = 0;
82 
83  if (dest == NULL) {
84  invoke_safe_str_constraint_handler("strcmp_s: dest is null",
85  NULL, ESNULLP);
86  return RCNEGATE(ESNULLP);
87  }
88 
89  if (src == NULL) {
90  invoke_safe_str_constraint_handler("strcmp_s: src is null",
91  NULL, ESNULLP);
92  return RCNEGATE(ESNULLP);
93  }
94 
95  if (dmax == 0) {
96  invoke_safe_str_constraint_handler("strcmp_s: dmax is 0",
97  NULL, ESZEROL);
98  return RCNEGATE(ESZEROL);
99  }
100 
101  if (dmax > RSIZE_MAX_STR) {
102  invoke_safe_str_constraint_handler("strcmp_s: dmax exceeds max",
103  NULL, ESLEMAX);
104  return RCNEGATE(ESLEMAX);
105  }
106 
107  while (*dest && *src && dmax) {
108 
109  if (*dest != *src) {
110  break;
111  }
112 
113  dest++;
114  src++;
115  dmax--;
116  }
117 
118  *indicator = *dest - *src;
119  return RCNEGATE(EOK);
120 }
121 EXPORT_SYMBOL(strcmp_s)
errno_t strcmp_s(const char *dest, rsize_t dmax, const char *src, int *indicator)
Compares string src to string dest.
Definition: strcmp_s.c:73
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.