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// Copyright (c) 2009, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This header provides replacements for libc functions that we need. We if
// call the libc functions directly we risk crashing in the dynamic linker as
// it tries to resolve uncached PLT entries.
#ifndef CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_
#define CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_
#include <stdint.h>
#include <limits.h>
#include <sys/types.h>
extern "C" {
static inline size_t
my_strlen(const char* s) {
size_t len = 0;
while (*s++) len++;
return len;
}
static inline int
my_strcmp(const char* a, const char* b) {
for (;;) {
if (*a < *b)
return -1;
else if (*a > *b)
return 1;
else if (*a == 0)
return 0;
a++;
b++;
}
}
static inline int
my_strncmp(const char* a, const char* b, size_t len) {
for (size_t i = 0; i < len; ++i) {
if (*a < *b)
return -1;
else if (*a > *b)
return 1;
else if (*a == 0)
return 0;
a++;
b++;
}
return 0;
}
// Parse a non-negative integer.
// result: (output) the resulting non-negative integer
// s: a NUL terminated string
// Return true iff successful.
static inline bool
my_strtoui(int* result, const char* s) {
if (*s == 0)
return false;
int r = 0;
for (;; s++) {
if (*s == 0)
break;
const int old_r = r;
r *= 10;
if (*s < '0' || *s > '9')
return false;
r += *s - '0';
if (r < old_r)
return false;
}
*result = r;
return true;
}
// Return the length of the given, non-negative integer when expressed in base
// 10.
static inline unsigned
my_int_len(intmax_t i) {
if (!i)
return 1;
int len = 0;
while (i) {
len++;
i /= 10;
}
return len;
}
// Convert a non-negative integer to a string
// output: (output) the resulting string is written here. This buffer must be
// large enough to hold the resulting string. Call |my_int_len| to get the
// required length.
// i: the non-negative integer to serialise.
// i_len: the length of the integer in base 10 (see |my_int_len|).
static inline void
my_itos(char* output, intmax_t i, unsigned i_len) {
for (unsigned index = i_len; index; --index, i /= 10)
output[index - 1] = '0' + (i % 10);
}
static inline const char*
my_strchr(const char* haystack, char needle) {
while (*haystack && *haystack != needle)
haystack++;
if (*haystack == needle)
return haystack;
return (const char*) 0;
}
// Read a hex value
// result: (output) the resulting value
// s: a string
// Returns a pointer to the first invalid charactor.
static inline const char*
my_read_hex_ptr(uintptr_t* result, const char* s) {
uintptr_t r = 0;
for (;; ++s) {
if (*s >= '0' && *s <= '9') {
r <<= 4;
r += *s - '0';
} else if (*s >= 'a' && *s <= 'f') {
r <<= 4;
r += (*s - 'a') + 10;
} else if (*s >= 'A' && *s <= 'F') {
r <<= 4;
r += (*s - 'A') + 10;
} else {
break;
}
}
*result = r;
return s;
}
static inline void
my_memset(void* ip, char c, size_t len) {
char* p = (char *) ip;
while (len--)
*p++ = c;
}
} // extern "C"
#endif // CLIENT_LINUX_LINUX_LIBC_SUPPORT_H_
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