source: src/tests/coroutine/fmtLines.c@ 41624f92

// 
// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
// 
// fmtLines.cc -- 
// 
// Author           : Peter A. Buhr
// Created On       : Sun Sep 17 21:56:15 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Tue Dec  5 21:56:35 2017
// Update Count     : 38
// 

#include <fstream>
#include <coroutine>

coroutine Format {
        char ch;                                                                                        // used for communication
        int g, b;                                                                                       // global because used in destructor
};

void ?{}( Format & fmt ) {
        resume( fmt );                                                                          // prime (start) coroutine
}

void ^?{}( Format & fmt ) with( fmt ) {
        if ( g != 0 || b != 0 ) sout | endl;
}

void main( Format & fmt ) with( fmt ) {
        for ( ;; ) {                                                                            // for as many characters
                for ( g = 0; g < 5; g += 1 ) {                                  // groups of 5 blocks
                        for ( b = 0; b < 4; b += 1 ) {                          // blocks of 4 characters
                                for ( ;; ) {                                                    // for newline characters
                                        suspend();
                                        if ( ch != '\n' ) break;                        // ignore newline
                                } // for
                                sout | ch;                                                              // print character
                        } // for
                        sout | "  ";                                                            // print block separator
                } // for
                sout | endl;                                                                    // print group separator
        } // for
} // main

void prt( Format & fmt, char ch ) {
        fmt.ch = ch;
        resume( fmt );
} // prt

int main() {
        Format fmt;                                                                                     // format characters into blocks of 4 and groups of 5 blocks per line
        char ch;

        Eof: for ( ;; ) {                                                                       // read until end of file
                sin | ch;                                                                               // read one character
          if ( eof( sin ) ) break Eof;                                          // eof ?
                prt( fmt, ch );                                                                 // push character for formatting
        } // for
} // main

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa fmtLines.c" //
// End: //