cat.c

ITT: make your best, most elegant implementation of cat(1) in C. Doesn't have to be POSIX compliant; for example, mine takes no option arguments because that's how I think it should be, whereas I think that POSIX specifies a few options.

#include <stdio.h>
int main(int argc, char **argv) {
    char b[4096];
    FILE *f = stdin;
    int i;
    size_t s;
    if (argc == 1)
        goto noargs;
    for (i = 1; i < argc; i++) {
        f = fopen(argv[i], "rb");
        if (!f) {
            fprintf(stderr, "%s: failed to open %s\n", argv[0], argv[i]);
            continue;
        }
        noargs:
        while ((s = fread(b, 1, 4096, f)))
            fwrite(b, 1, s, stdout);
    }
    return 0;
}

Why is this the best in my opinion? It is short, simple, fast, serves just the purpose of concatenating files and no more, and even has a clever and elegant trick to handle the special case of no arguments without code duplication.

>>20
haskell
elegant
(Show a, Show b, Show c) => Show (a, b, c)    
(Show a, Show b, Show c, Show d) => Show (a, b, c, d)    
(Show a, Show b, Show c, Show d, Show e) => Show (a, b, c, d, e)    
(Show a, Show b, Show c, Show d, Show e, Show f) => Show (a, b, c, d, e, f)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g) => Show (a, b, c, d, e, f, g)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h) => Show (a, b, c, d, e, f, g, h)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i) => Show (a, b, c, d, e, f, g, h, i)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j) => Show (a, b, c, d, e, f, g, h, i, j)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j, Show k) => Show (a, b, c, d, e, f, g, h, i, j, k)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j, Show k, Show l) => Show (a, b, c, d, e, f, g, h, i, j, k, l)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j, Show k, Show l, Show m) => Show (a, b, c, d, e, f, g, h, i, j, k, l, m)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j, Show k, Show l, Show m, Show n) => Show (a, b, c, d, e, f, g, h, i, j, k, l, m, n)    
(Show a, Show b, Show c, Show d, Show e, Show f, Show g, Show h, Show i, Show j, Show k, Show l, Show m, Show n, Show o) => Show (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)