Re: [9fans] tcs bug.

[Russ Cox]

You've invented buffered I/O.

#include <u.h>
#include <libc.h>
#include <bio.h>

void
usage(void)
{
        fprint(2, "usage: runecvt [-l | -t | -u] [file...]\n");
        exits("usage");
}

void
convert(Biobuf *bin, Biobuf *bout, Rune (*fn)(Rune))
{
        int c;
        
        while((c = Bgetrune(bin)) != -1)
                Bputrune(bout, fn(c));
}

void
main(int argc, char **argv)
{
        int i;
        Biobuf *b, bin, bout;
        Rune (*fn)(Rune);
        
        fn = toupperrune;
        ARGBEGIN{
        case 'l':
                fn = tolowerrune;
                break;
        case 't':
                fn = totitlerune;
                break;
        case 'u':
                fn = toupperrune;
                break;
        default:
                usage();
        }ARGEND
        
        Binit(&bout, 1, OWRITE);
        if(argc == 0){
                Binit(&bin, 0, OREAD);
                convert(&bin, &bout, fn);
        }else{
                for(i=0; i<argc; i++){
                        if((b = Bopen(argv[i], OREAD)) == nil)
                                sysfatal("open %s: %r", argv[i]);
                        convert(b, &bout, fn);
                }
        }
        Bterm(&bout);
        exits(nil);
}