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head.c

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#include <stdio.h>

#include <stdlib.h>

static void do_head(FILE *f, long nlines);

int

main(int argc, char *argv[])

{

if (argc != 2) {

fprintf(stderr, "Usage: %s n\n", argv[0]);

exit(1);

}

do_head(stdin, atol(argv[1]));

exit(0);

}

static void

do_head(FILE *f, long nlines)

{

int c;

if (nlines <= 0) return;

while ((c = getc(f)) != EOF) {

if (putchar(c) < 0) exit(1);

if (c == '\n') {

nlines--;

if (nlines == 0) return;

}

}

}