// re2c $INPUT -o $OUTPUT #include <cassert> #include <cstdio> #include <fstream> #include <sstream> static void convert_newlines(std::ifstream &in, std::ostringstream &out) { std::streampos mar; loop: /*!re2c re2c:yyfill:enable = 0; re2c:flags:input = custom; re2c:api:style = free-form; re2c:define:YYCTYPE = char; re2c:define:YYPEEK = "in.peek()"; re2c:define:YYSKIP = "do { in.ignore(); if (in.eof()) return; } while(0);"; re2c:define:YYBACKUP = "mar = in.tellg();"; re2c:define:YYRESTORE = "in.seekg(mar);"; * { out.put(yych); goto loop; } "\r\n" { out.put('\n'); goto loop; } */ } int main() { const char *fname = "input"; const char s1[] = "Text\r\nwith\r\nnewlines.\r\n\r\n"; const char s2[] = "Text\nwith\nnewlines.\n\n"; std::ofstream f(fname, std::ios::binary); f.write(s1, sizeof(s1) - 1); f.close(); std::ifstream in(fname, std::ios::binary); std::ostringstream out; convert_newlines(in, out); assert(out.str() == s2); remove(fname); return 0; }