1 | // Copyright (c) 2009, Google Inc. |
2 | // All rights reserved. |
3 | // |
4 | // Redistribution and use in source and binary forms, with or without |
5 | // modification, are permitted provided that the following conditions are |
6 | // met: |
7 | // |
8 | // * Redistributions of source code must retain the above copyright |
9 | // notice, this list of conditions and the following disclaimer. |
10 | // * Redistributions in binary form must reproduce the above |
11 | // copyright notice, this list of conditions and the following disclaimer |
12 | // in the documentation and/or other materials provided with the |
13 | // distribution. |
14 | // * Neither the name of Google Inc. nor the names of its |
15 | // contributors may be used to endorse or promote products derived from |
16 | // this software without specific prior written permission. |
17 | // |
18 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
20 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
21 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
22 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
23 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
24 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
25 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
28 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 | |
30 | // This header provides replacements for libc functions that we need. We if |
31 | // call the libc functions directly we risk crashing in the dynamic linker as |
32 | // it tries to resolve uncached PLT entries. |
33 | |
34 | #ifndef CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_ |
35 | #define CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_ |
36 | |
37 | #include <stdint.h> |
38 | #include <limits.h> |
39 | #include <sys/types.h> |
40 | |
41 | extern "C" { |
42 | |
43 | extern size_t my_strlen(const char* s); |
44 | |
45 | extern int my_strcmp(const char* a, const char* b); |
46 | |
47 | extern int my_strncmp(const char* a, const char* b, size_t len); |
48 | |
49 | // Parse a non-negative integer. |
50 | // result: (output) the resulting non-negative integer |
51 | // s: a NUL terminated string |
52 | // Return true iff successful. |
53 | extern bool my_strtoui(int* result, const char* s); |
54 | |
55 | // Return the length of the given unsigned integer when expressed in base 10. |
56 | extern unsigned my_uint_len(uintmax_t i); |
57 | |
58 | // Convert an unsigned integer to a string |
59 | // output: (output) the resulting string is written here. This buffer must be |
60 | // large enough to hold the resulting string. Call |my_uint_len| to get the |
61 | // required length. |
62 | // i: the unsigned integer to serialise. |
63 | // i_len: the length of the integer in base 10 (see |my_uint_len|). |
64 | extern void my_uitos(char* output, uintmax_t i, unsigned i_len); |
65 | |
66 | extern const char* my_strchr(const char* haystack, char needle); |
67 | |
68 | extern const char* my_strrchr(const char* haystack, char needle); |
69 | |
70 | // Read a hex value |
71 | // result: (output) the resulting value |
72 | // s: a string |
73 | // Returns a pointer to the first invalid charactor. |
74 | extern const char* my_read_hex_ptr(uintptr_t* result, const char* s); |
75 | |
76 | extern const char* my_read_decimal_ptr(uintptr_t* result, const char* s); |
77 | |
78 | extern void my_memset(void* ip, char c, size_t len); |
79 | |
80 | extern void* my_memchr(const void* src, int c, size_t len); |
81 | |
82 | // The following are considered safe to use in a compromised environment. |
83 | // Besides, this gives the compiler an opportunity to optimize their calls. |
84 | #define my_memcpy memcpy |
85 | #define my_memmove memmove |
86 | #define my_memcmp memcmp |
87 | |
88 | extern size_t my_strlcpy(char* s1, const char* s2, size_t len); |
89 | |
90 | extern size_t my_strlcat(char* s1, const char* s2, size_t len); |
91 | |
92 | extern int my_isspace(int ch); |
93 | |
94 | } // extern "C" |
95 | |
96 | #endif // CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_ |
97 | |