132 lines
2.8 KiB
C++
132 lines
2.8 KiB
C++
/**
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This file is a part of rexy's matrix client
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Copyright (C) 2019-2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <rexy/string.hpp>
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namespace raii{
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namespace detail{
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size_t _calc_escaped_len(const char* str){
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size_t ret = 0;
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for(const char* c = str;*c;++c){
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switch(*c){
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case '\\':
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case '"':
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case '/':
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case '\n':
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case '\r':
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case '\b':
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case '\f':
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case '\t':
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++ret;
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break;
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};
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++ret;
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}
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return ret;
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}
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char _escape_to_letter(char escape){
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switch(escape){
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case '\n':
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return 'n';
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case '\r':
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return 'r';
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case '\b':
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return 'b';
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case '\f':
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return 'f';
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case '\t':
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return 't';
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};
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return '\\';
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}
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size_t _sanitize_json_copy(char* dest, const char* in){
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size_t pos = 0;
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for(const char* c = in;*c;++c){
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switch(*c){
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case '"':
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case '\\':
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case '/':
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dest[pos++] = '\\';
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dest[pos++] = *c;
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break;
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case '\n':
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case '\r':
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case '\b':
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case '\f':
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case '\t':
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dest[pos++] = '\\';
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dest[pos++] = _escape_to_letter(*c);
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break;
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default:
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dest[pos++] = *c;
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};
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}
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dest[pos] = 0;
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return pos;
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}
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}
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rexy::string json_escape(const rexy::string_base& str){
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size_t len = detail::_calc_escaped_len(str.get());
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char* tmp = reinterpret_cast<char*>(rexy::string::allocator_type::allocate(len+1));
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detail::_sanitize_json_copy(tmp, str);
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tmp[len] = 0;
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return rexy::string(tmp, len, len);
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}
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//shamelessly stolen from stackoverflow (of all the things to need to steal)
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size_t intlen(int i){
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if(i >= 100000){
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if(i >= 10000000){
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if(i >= 1000000000) return 10;
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if(i >= 100000000) return 9;
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return 8;
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}
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if(i >= 1000000) return 7;
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return 6;
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}else{
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if(i >= 1000){
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if(i >= 10000) return 5;
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return 4;
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}else{
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if(i >= 100) return 3;
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if(i >= 10) return 2;
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return 1;
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}
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}
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}
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rexy::string itostr(int i){
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if(i == 0)
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return rexy::string("0");
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int place = intlen(i);
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rexy::string ret(place, place);
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char* buf = ret.get();
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buf[place] = 0;
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while(i != 0){
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int rem = i % 10;
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buf[--place] = rem + '0';
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i /= 10;
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}
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return ret;
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}
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}
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