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#pragma once
#include <types.h>
extern "C" {
void* memcpy(void* dstptr, const void* srcptr, size_t n);
void* memset(void* bufptr, int value, size_t n);
void* memmove(void* dstptr, const void* srcptr, size_t n);
int memcmp(const void* aptr, const void* bptr, size_t n);
}
/**
* Calculate the length of the string (in bytes) pointed to by str, excluding
* the terminating null character.
*/
constexpr size_t strlen(const char* str) {
size_t len = 0;
while (str[len] != '\0') ++len;
return len;
}
/**
* Reverse array in place
*/
constexpr void reverse(char s[], size_t strlen) {
int i, j;
char c;
for (i = 0, j = strlen - 1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
class ViewIterator {
public:
char next() { return buffer[reverse ? pos-- : pos++]; }
operator bool() const { return reverse ? (pos >= 0) : (pos < length); }
explicit ViewIterator(const char* b, size_t l, bool r = false) : buffer(b), length(l), reverse(r) {
if (reverse) pos = length - 1;
};
private:
ssize_t pos = 0;
const char* const buffer; // const pointer to const char*
const size_t length;
const bool reverse;
};
class StringView {
public:
StringView(const char* d) : buffer{d}, m_length{strlen(d)} {}
StringView(const char* d, size_t l) : buffer{d}, m_length{l} {}
auto begin() const { return ViewIterator(buffer, m_length); }
private:
const char* const buffer;
const size_t m_length;
};
class IntegerView {
public:
struct HexFormat_int32 {
int32_t n;
};
struct HexFormat_uint32 {
uint32_t n;
};
IntegerView(int32_t n);
IntegerView(uint32_t n);
IntegerView(HexFormat_int32 f);
IntegerView(HexFormat_uint32 f);
auto begin() const { return ViewIterator(buffer, length, true); }
private:
char buffer[32];
size_t length = 0;
};
using hex = IntegerView::HexFormat_int32;
using uhex = IntegerView::HexFormat_uint32;
// using hex_addr = IntegerView::HexFormat<uint64_t>; // TODO causes crash
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