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#include "util/string.h"
#include <print>
#include <cstdio>
using namespace std;
namespace ov4
{
/*
* construct C-style **argv
* user should be responsible for allocation of **argv
* and make sure it's large enough
* argv should be the address to an empty and continuous memory space
*/
void string2argv(const vector<string> &v, char **argv)
{
// pointers [0, size)
// nullptr [size]
// data [size+1, ...)
char *p = (char*)(argv + v.size() + 1);
argv[v.size()] = nullptr;
for (size_t i = 0; i < v.size(); i++)
{
strcpy(p, v[i].c_str());
argv[i] = p;
p += v[i].size() + 1; // for '\0'
}
}
/*
* allocate heap memory, and construct C-style **argv
* NB: user should be responsible to ::operator delete();
*/
char **string2argv_alloc(const std::vector<std::string> &v)
{
size_t size = argv_get_required_size(v) * sizeof(char);
char **p = (char**)malloc(size);
string2argv(v, p);
return p;
}
void argv2string(vector<string> &v, const char * const * argv)
{
if (argv == nullptr) return;
v.clear();
for (size_t i = 0; true; i++)
{
if (argv[i] == nullptr) return;
v.push_back(argv[i]);
}
}
/*
* return the memory size required to construct argv[][]
* in byte
*/
size_t argv_get_required_size(const std::vector<std::string> &v)
{
size_t ret = 0;
ret += sizeof(char*) * (v.size() + 1); // point to every strings in v, and nullptr terminator
for (auto &sub : v)
ret += sizeof(char) * (sub.size() + 1); // chars, and null terminator
return ret;
}
std::string safe_str(const char *s, const char *fallback)
{
return (s != nullptr) ? s : fallback;
}
void print_str_hex(const std::string &s)
{
for (unsigned char c : s)
{
print("{:02X} ", c);
}
}
}
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