safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strspn_s.c
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1 /*------------------------------------------------------------------
2  * strspn_s.c
3  *
4  * November 2008, Bo Berry
5  *
6  * Copyright (c) 2008-2011, 2013 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 
68 errno_t
69 strspn_s (const char *dest, rsize_t dmax,
70  const char *src, rsize_t slen, rsize_t *count)
71 {
72  const char *scan2;
73  rsize_t smax;
74  bool match_found;
75 
76  if (count== NULL) {
77  invoke_safe_str_constraint_handler("strspn_s: count is null",
78  NULL, ESNULLP);
79  return RCNEGATE(ESNULLP);
80  }
81  *count = 0;
82 
83  if (dest == NULL) {
84  invoke_safe_str_constraint_handler("strspn_s: dest is null",
85  NULL, ESNULLP);
86  return RCNEGATE(ESNULLP);
87  }
88 
89  if (src == NULL) {
90  invoke_safe_str_constraint_handler("strspn_s: src is null",
91  NULL, ESNULLP);
92  return RCNEGATE(ESNULLP);
93  }
94 
95  if (dmax == 0 ) {
96  invoke_safe_str_constraint_handler("strspn_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("strspn_s: dmax exceeds max",
103  NULL, ESLEMAX);
104  return RCNEGATE(ESLEMAX);
105  }
106 
107  if (slen == 0 ) {
108  invoke_safe_str_constraint_handler("strspn_s: slen is 0",
109  NULL, ESZEROL);
110  return RCNEGATE(ESZEROL);
111  }
112 
113  if (slen > RSIZE_MAX_STR) {
114  invoke_safe_str_constraint_handler("strspn_s: slen exceeds max",
115  NULL, ESLEMAX);
116  return RCNEGATE(ESLEMAX);
117  }
118 
119  while (*dest && dmax) {
120 
121  /*
122  * Scan the entire src string for each dest character, counting
123  * inclusions.
124  */
125  match_found = false;
126  smax = slen;
127  scan2 = src;
128  while (*scan2 && smax) {
129 
130  if (*dest == *scan2) {
131  match_found = true;
132  break;
133  }
134  scan2++;
135  smax--;
136  }
137 
138  if (match_found) {
139  (*count)++;
140  } else {
141  break;
142  }
143 
144  dest++;
145  dmax--;
146  }
147 
148  return RCNEGATE(EOK);
149 }
150 EXPORT_SYMBOL(strspn_s)
errno_t strspn_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: strspn_s.c:69
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.