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// 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;
for (;;) {
/*!re2c
re2c:api= custom;
re2c:api:style = free-form;
re2c:define:YYCTYPE = char;
re2c:define:YYPEEK = "in.peek()";
re2c:define:YYSKIP = "{ in.ignore(); if (in.eof()) return; }";
re2c:define:YYBACKUP = "mar = in.tellg();";
re2c:define:YYRESTORE = "in.seekg(mar);";
re2c:yyfill:enable = 0;
* { out.put(yych); continue; }
"\r\n" { out.put('\n'); continue; }
*/
}
}
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;
}