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head2.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[])

{

long nlines;

if (argc < 2) {

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

exit(1);

}

nlines = atol(argv[1]);

if (argc == 2) {

do_head(stdin, nlines);

} else { /* この節が追加された */

int i;

for (i = 2; i < argc; i++) {

FILE *f;

f = fopen(argv[i], "r");

if (!f) {

perror(argv[i]);

exit(1);

}

do_head(f, nlines);

fclose(f);

}

}

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;

}

}

}