safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strcspn_s.c
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1 /*------------------------------------------------------------------
2  * strcspn_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 
72 errno_t
73 strcspn_s (const char *dest, rsize_t dmax,
74  const char *src, rsize_t slen, rsize_t *count)
75 {
76  const char *scan2;
77  rsize_t smax;
78 
79  if (count== NULL) {
80  invoke_safe_str_constraint_handler("strcspn_s: count is null",
81  NULL, ESNULLP);
82  return RCNEGATE(ESNULLP);
83  }
84  *count = 0;
85 
86  if (dest == NULL) {
87  invoke_safe_str_constraint_handler("strcspn_s: dest is null",
88  NULL, ESNULLP);
89  return RCNEGATE(ESNULLP);
90  }
91 
92  if (src == NULL) {
93  invoke_safe_str_constraint_handler("strcspn_s: src is null",
94  NULL, ESNULLP);
95  return RCNEGATE(ESNULLP);
96  }
97 
98  if (dmax == 0 ) {
99  invoke_safe_str_constraint_handler("strcspn_s: dmax is 0",
100  NULL, ESZEROL);
101  return RCNEGATE(ESZEROL);
102  }
103 
104  if (dmax > RSIZE_MAX_STR) {
105  invoke_safe_str_constraint_handler("strcspn_s: dmax exceeds max",
106  NULL, ESLEMAX);
107  return RCNEGATE(ESLEMAX);
108  }
109 
110  if (slen == 0 ) {
111  invoke_safe_str_constraint_handler("strcspn_s: slen is 0",
112  NULL, ESZEROL);
113  return RCNEGATE(ESZEROL);
114  }
115 
116  if (slen > RSIZE_MAX_STR) {
117  invoke_safe_str_constraint_handler("strcspn_s: slen exceeds max",
118  NULL, ESLEMAX);
119  return RCNEGATE(ESLEMAX);
120  }
121 
122  while (*dest && dmax) {
123 
124  /*
125  * Scanning for exclusions, so if there is a match,
126  * we're done!
127  */
128  smax = slen;
129  scan2 = src;
130  while (*scan2 && smax) {
131 
132  if (*dest == *scan2) {
133  return RCNEGATE(EOK);
134  }
135  scan2++;
136  smax--;
137  }
138 
139  (*count)++;
140  dest++;
141  dmax--;
142  }
143 
144  return RCNEGATE(EOK);
145 }
146 EXPORT_SYMBOL(strcspn_s)
errno_t strcspn_s(const char *dest, rsize_t dmax, const char *src, rsize_t slen, rsize_t *count)
This function computes the prefix length of the string pointed to by dest which consists entirely of ...
Definition: strcspn_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.