1 files changed, 60 insertions, 0 deletions
diff --git a/tail.c b/tail.c
new file mode 100644
index 0000000..99a6eb0
--- /dev/null
+++ b/tail.c
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+ */
+#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 the last part of files."
+#define OPERANDS    "[-n number] [file] ..."
+#include "common.h"
+
+#ifdef FASESBOX
+int tail_main(int argc, char *argv[]) {
+#else
+int main(int argc, char *argv[]) {
+#endif
+	int argument, i = 1, lines = 10, file_lines = 0;
+	FILE *file = NULL;
+
+	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);
+		}
+	} argc -= optind; argv += optind;
+	if (argc < 1) {
+		while (read(STDIN_FILENO, s, 4096) > 0)
+			printf("%s", s);
+	}
+	for (i = 0; i != argc; i++) {
+		if (strcmp(argv[i], "-")) file = fopen(argv[i], "r");
+		else while (read(STDIN_FILENO, s, 4096) > 0) printf("%s", s);
+		if (file == NULL)
+			return errprint(argv[0], argv[i], errno); /* Something went wrong */
+		while (fgets(s, 4096, file) != NULL) 
+			file_lines++; /* Get number of lines */
+		fclose(file);
+		file_lines = file_lines - lines;
+		if (strcmp(argv[i], "-")) file = fopen(argv[i], "r");
+		while (fgets(s, 4096, file) != NULL) {
+			if (errno) return errprint(argv0, argv[i], errno);
+			if (file_lines == 0) printf("%s", s);
+			else file_lines--;
+		}
+	}
+
+	return errprint(argv0, NULL, errno);
+}