1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* %CopyrightBegin%
*
* SPDX-License-Identifier: Apache-2.0
*
* Copyright Ericsson AB 2008-2025. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Module: safe_string.c
*
* This is a bunch of generic string operation
* that are safe regarding buffer overflow.
*
* All string functions terminate the process with an error message
* on buffer overflow.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "safe_string.h"
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
static void string_overflow_handler(const char* format, ...)
{
va_list args;
va_start(args, format);
vfprintf(stderr,format,args);
va_end(args);
exit(1);
}
int vsn_printf(char* dst, size_t size, const char* format, va_list args)
{
int ret = vsnprintf(dst, size, format, args);
if (ret >= size || ret < 0) {
string_overflow_handler("Buffer truncated '%s'\n",dst);
}
return ret;
}
int sn_printf(char* dst, size_t size, const char* format, ...)
{
va_list args;
int ret;
va_start(args, format);
ret = vsn_printf(dst,size,format,args);
va_end(args);
return ret;
}
int strn_cpy(char* dst, size_t size, const char* src)
{
return sn_printf(dst,size,"%s",src);
}
int strn_cat(char* dst, size_t size, const char* src)
{
return strn_catf(dst,size,"%s",src);
}
int strn_catf(char* dst, size_t size, const char* format, ...)
{
int ret;
va_list args;
#ifdef _GNU_SOURCE
int len = strnlen(dst,size);
#else
int len = strlen(dst);
#endif
if (len >= size) {
string_overflow_handler("Buffer already overflowed '%.*s'\n",
size, dst);
}
va_start(args, format);
ret = vsn_printf(dst+len, size-len, format, args);
va_end(args);
return len+ret;
}
char* find_str(const char* haystack, int hsize, const char* needle)
{
int i = 0;
int nsize = strlen(needle);
hsize -= nsize - 1;
for (i=0; i<hsize; i++) {
if (haystack[i]==needle[0] && strncmp(haystack+i,needle,nsize)==0) {
return (char*)(haystack+i);
}
}
return NULL;
}
|
