https://issues.dlang.org/show_bug.cgi?id=14861

          Issue ID: 14861
           Summary: Error in stdio.d in LockingTextReader.readFront()
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: critical
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: mgw@yandex.ru

This mistake, is result of wrong algorithm with reading from the ring buffer of the file and return of the read symbols there in stdio function ungetc().

This example doesn't work!

// dmd 2.067.1 Win 32
import std.stdio;

void main(string[] args) {
    File fw = File("panic.csv", "w");
    for(int i; i != 5000; i++) fw.writeln(i, ";", "Иванов;Пётр;Петрович");
    fw.close();
    // Test read
    File fr = File("panic.csv", "r");
    int nom; string fam, nam, ot;
    // Error format read
    while(!fr.eof) fr.readf("%s;%s;%s;%s\n", &nom, &fam, &nam, &ot);
}

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