57 lines
908 B
C
57 lines
908 B
C
/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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static void head(FILE *, const char *, long);
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static void
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usage(void)
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{
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eprintf("usage: %s [-n] [FILE...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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long n = 10;
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FILE *fp;
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ARGBEGIN {
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case 'n':
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n = estrtol(EARGF(usage()), 0);
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break;
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default:
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usage();
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} ARGEND;
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if(argc == 0) {
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head(stdin, "<stdin>", n);
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} else for(; argc > 0; argc--, argv++) {
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if(!(fp = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
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head(fp, argv[0], n);
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fclose(fp);
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}
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return EXIT_SUCCESS;
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}
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void
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head(FILE *fp, const char *str, long n)
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{
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char buf[BUFSIZ];
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long i = 0;
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while(i < n && fgets(buf, sizeof buf, fp)) {
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fputs(buf, stdout);
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if(buf[strlen(buf)-1] == '\n')
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i++;
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}
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if(ferror(fp))
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eprintf("%s: read error:", str);
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}
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