safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strcasecmp_s.c
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1 /*------------------------------------------------------------------
2  * strcasecmp_s.c
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 
73 errno_t
74 strcasecmp_s (const char *dest, rsize_t dmax,
75  const char *src, int *indicator)
76 {
77  const unsigned char *udest = (const unsigned char *) dest;
78  const unsigned char *usrc = (const unsigned char *) src;
79 
80  if (indicator == NULL) {
81  invoke_safe_str_constraint_handler("strcasecmp_s: indicator is null",
82  NULL, ESNULLP);
83  return RCNEGATE(ESNULLP);
84  }
85  *indicator = 0;
86 
87  if (dest == NULL) {
88  invoke_safe_str_constraint_handler("strcasecmp_s: dest is null",
89  NULL, ESNULLP);
90  return RCNEGATE(ESNULLP);
91  }
92 
93  if (src == NULL) {
94  invoke_safe_str_constraint_handler("strcasecmp_s: src is null",
95  NULL, ESNULLP);
96  return RCNEGATE(ESNULLP);
97  }
98 
99  if (dmax == 0) {
100  invoke_safe_str_constraint_handler("strcasecmp_s: dmax is 0",
101  NULL, ESZEROL);
102  return RCNEGATE(ESZEROL);
103  }
104 
105  if (dmax > RSIZE_MAX_STR) {
106  invoke_safe_str_constraint_handler("strcasecmp_s: dmax exceeds max",
107  NULL, ESLEMAX);
108  return RCNEGATE(ESLEMAX);
109  }
110 
111  while (*udest && *usrc && dmax) {
112 
113  if (toupper(*udest) != toupper(*usrc)) {
114  break;
115  }
116 
117  udest++;
118  usrc++;
119  dmax--;
120  }
121 
122  *indicator = (toupper(*udest) - toupper(*usrc));
123  return RCNEGATE(EOK);
124 }
125 EXPORT_SYMBOL(strcasecmp_s)
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.
errno_t strcasecmp_s(const char *dest, rsize_t dmax, const char *src, int *indicator)
Case insensitive string comparison by converting to uppercase prior to the compare.
Definition: strcasecmp_s.c:74