1 files changed, 56 insertions, 0 deletions
diff --git a/head.c b/head.c
new file mode 100644
index 0000000..83edfe8
--- /dev/null
+++ b/head.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+ * Copyright (C) 2022 Leah Rowe <leah@libreboot.org>
+ */
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define REQ_PRINT_USAGE /* Require print_usage() from common.h */
+#define REQ_ERRPRINT /* Require errprint() from common.h */
+#define DESCRIPTION "Copy file to standard output until <number> lines."
+#define OPERANDS    "[-n number] [file] ..."
+#include "common.h"
+
+#ifdef FASESBOX
+int head_main(int argc, char *argv[]) {
+#else
+int main(int argc, char *argv[]) {
+#endif
+	int argument, i, lines = 10, lines_printed;
+	FILE *file;
+	char s[4096], *argv0 = strdup(argv[0]);
+
+	while ((argument = getopt(argc, argv, "n:")) != -1) {
+		if (argument == '?' || argument == ':') {
+			print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION);
+			return 1;
+		}
+		else if (argument == 'n') {
+			lines = strtol(optarg, NULL, 10);
+			if (errno) return errprint(argv[0], "strtol()", errno);
+		}
+		else
+			lines = 10;
+	} argc -= optind; argv += optind;
+
+	for (i = 0; i != argc || argc == 0; i++) {
+		if (argc == 0 || !strcmp(argv[i], "-"))
+			file = stdin;
+		else file = fopen(argv[i], "r");
+		if (file == NULL) 
+			return errprint(argv0, argv[i], errno); /* Something went wrong */
+		for (lines_printed = 1; lines_printed <= lines; lines_printed++) {
+			if (fgets(s, 4096, file) != NULL)
+				printf("%s", s);
+			else return errprint(argv0, "fgets()", errno);
+		}
+		if (file != stdin) fclose(file);
+		if (argc == 0) return 0; /* TODO: Remove this stupid hack. */
+	}
+	return errprint(argv0, NULL, errno);
+}