88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
#pragma once
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#include <cstdio>
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#include <unistd.h>
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#include <string>
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#include <memory>
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#include <sstream>
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#include <fstream>
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namespace util {
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inline bool starts_with(std::string s, std::string prefix) {
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return s.compare(0, prefix.size(), prefix) == 0;
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}
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template<typename ... Args>
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inline std::string string_format( const std::string& format, Args ... args ) {
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size_t size = snprintf( nullptr, 0, format.c_str(), args ... ) + 1;
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std::unique_ptr<char[]> buf( new char[ size ] );
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snprintf( buf.get(), size, format.c_str(), args ... );
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return std::string( buf.get(), buf.get() + size - 1 );
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}
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inline std::string read_file(std::string fn) {
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std::ifstream t(fn);
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std::stringstream buffer;
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buffer << t.rdbuf();
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return buffer.str();
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}
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inline std::string tohex(const uint8_t* buf, size_t buf_size) {
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std::unique_ptr<char[]> hexbuf(new char[buf_size*2+1]);
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for (size_t i=0; i < buf_size; i++) {
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sprintf(&hexbuf[i*2], "%02x", buf[i]);
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}
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hexbuf[buf_size*2] = 0;
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return std::string(hexbuf.get(), hexbuf.get() + buf_size*2);
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}
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inline std::string base_name(std::string const & path) {
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size_t pos = path.find_last_of("/");
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if (pos == std::string::npos) return path;
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return path.substr(pos + 1);
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}
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inline std::string dir_name(std::string const & path) {
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size_t pos = path.find_last_of("/");
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if (pos == std::string::npos) return "";
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return path.substr(0, pos);
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}
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inline std::string readlink(std::string path) {
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char buff[4096];
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ssize_t len = ::readlink(path.c_str(), buff, sizeof(buff)-1);
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if (len != -1) {
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buff[len] = '\0';
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return std::string(buff);
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}
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return "";
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}
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inline std::string getenv_default(const char* env_var, const char * suffix, const char* default_val) {
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const char* env_val = getenv(env_var);
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if (env_val != NULL){
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return std::string(env_val) + std::string(suffix);
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} else {
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return std::string(default_val);
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}
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}
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}
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struct unique_fd {
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unique_fd(int fd = -1) : fd_(fd) {}
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unique_fd& operator=(unique_fd&& uf) {
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fd_ = uf.fd_;
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uf.fd_ = -1;
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return *this;
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}
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~unique_fd() {
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if (fd_ != -1) close(fd_);
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}
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operator int() const { return fd_; }
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int fd_;
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};
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