safec  2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strprefix_s.c
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1 /*------------------------------------------------------------------
2  * strprefix_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 
69 errno_t
70 strprefix_s (const char *dest, rsize_t dmax, const char *src)
71 {
72  if (dest == NULL) {
73  invoke_safe_str_constraint_handler("strprefix_s: dest is null",
74  NULL, ESNULLP);
75  return (ESNULLP);
76  }
77 
78  if (src == NULL) {
79  invoke_safe_str_constraint_handler("strprefix_s: src is null",
80  NULL, ESNULLP);
81  return (ESNULLP);
82  }
83 
84  if (dmax == 0) {
85  invoke_safe_str_constraint_handler("strprefix_s: dmax is 0",
86  NULL, ESZEROL);
87  return (ESZEROL);
88  }
89 
90  if (dmax > RSIZE_MAX_STR) {
91  invoke_safe_str_constraint_handler("strprefix_s: dmax exceeds max",
92  NULL, ESLEMAX);
93  return (ESLEMAX);
94  }
95 
96  if (*src == '\0') {
97  return (ESNOTFND);
98  }
99 
100  while (*src && dmax) {
101 
102  if (*dest != *src) {
103  return (ESNOTFND);
104  }
105 
106  dmax--;
107  dest++;
108  src++;
109  }
110 
111  return (EOK);
112 }
errno_t strprefix_s(const char *dest, rsize_t dmax, const char *src)
Determines if the prefix pointed to by src is at the beginning of string pointed to by dest...
Definition: strprefix_s.c:70
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.