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#include <algorithm>
#include <cstdlib>
#include <string>
#include <unistd.h>
#include <vector>
int main(int argc, char* argv[]) {
constexpr int kForkFailed = 65;
constexpr int kPrerequisiteError = 97;
auto kEnv = std::string{"/usr/bin/env"};
if (argc < 3) {
return kPrerequisiteError;
}
// compute PATH
auto path = std::string{argv[1]};
auto const* env_path = std::getenv("PATH");
if (env_path && (*env_path != '\0')) {
path = std::string{env_path} + std::string{":"} + path;
}
auto path_arg = std::string{"PATH="} + path;
// create new argument vector
std::vector<char*> nargv{};
nargv.reserve(argc+3);
nargv.push_back(kEnv.data());
nargv.push_back(path_arg.data());
for (int i=2; i < argc; i++) {
nargv.push_back(argv[i]);
}
nargv.push_back(nullptr);
// exec
(void) execvp(nargv[0], static_cast<char* const*>(nargv.data()));
return kForkFailed;
}
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