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92 lines
2.5 KiB
92 lines
2.5 KiB
/**
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* Copyright (c) 2018 Niklas Rosenstein
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* MIT licensed.
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*
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* @description Some useful string functions.
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*/
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#pragma once
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#include <algorithm>
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#include <cctype>
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#include <functional>
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#include <locale>
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#include <cstring>
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namespace niklasrosenstein {
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/**
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* Convert a string or data to a hexadecimal representation. The buffer
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* must be double the size of the input data.
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*/
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// @{
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inline void tohex(char* buffer, void const* data, size_t size) {
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char const pool[] = "0123456789abcdef";
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for (size_t i = 0; i < size; ++i) {
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unsigned char c = reinterpret_cast<unsigned char const*>(data)[i];
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buffer[i * 2 + 0] = pool[(c >> 4) & 0xf];
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buffer[i * 2 + 1] = pool[(c >> 0) & 0xf];
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}
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}
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template <class string=std::string>
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inline string tohex(void const* data, size_t size) {
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string r(size * 2, 0);
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tohex(&r[0], data, size);
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return r;
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}
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template <class string=std::string>
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inline string tohex(const char* str) {
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return tohex<string>(str, std::strlen(str));
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}
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template <class instring, class outstring=instring>
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inline outstring tohex(instring const& str) {
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return tohex<outstring>(str.c_str(), str.size());
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}
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// @}
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/**
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* Returns true if #c is a whitespace character, false if not.
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* Unlike the standard #isspace(), this function does not assert whether
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* a valid ASCII character was passed to it. For any character outside of
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* the ASCII range, the function returns false.
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*/
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inline bool isspace(int chr) {
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if (chr < 0 || chr > 255) return false;
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else return ::isspace(chr);
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}
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/* Trims a string of whitespace from the left. */
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inline std::string& ltrim(std::string& s) {
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s.erase(s.begin(), std::find_if(s.begin(), s.end(), [] (auto&& c) { return !std::isspace(c); }));
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return s;
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}
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/* Trims a string of whitespace from the right. */
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inline std::string& rtrim(std::string& s) {
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s.erase(std::find_if(s.rbegin(), s.rend(), [] (auto&& c) { return !std::isspace(c); }).base(), s.end());
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return s;
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}
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/* Trims a string of whitespace from both ends. */
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template <class string>
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inline string& trim(string& s) {
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return ltrim(rtrim(s));
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}
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/* Converts a string to lowercase. */
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template <class string>
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inline string& tolower(string& s) {
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std::transform(s.begin(), s.end(), s.begin(), ::tolower);
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return s;
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}
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/* Converts a string to uppercase. */
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template <class string>
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inline string& toupper(string& s) {
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std::transform(s.begin(), s.end(), s.begin(), ::toupper);
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return s;
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}
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} // namespace niklasrosenstein
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