1 files changed, 57 insertions, 0 deletions
diff --git a/usr/utils/readlink.c b/usr/utils/readlink.c
new file mode 100644
index 0000000..1f16c02
--- /dev/null
+++ b/usr/utils/readlink.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+const char *progname;
+
+static __noreturn usage(void)
+{
+	fprintf(stderr, "Usage: %s [-f] link...\n", progname);
+	exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+	int c, f_flag = 0;
+	const char *name;
+	char link_name[PATH_MAX];
+	int rv;
+
+	progname = argv[0];
+
+	do {
+		c = getopt(argc, argv, "f");
+		if (c == EOF)
+			break;
+		switch (c) {
+		case 'f':
+			f_flag = 1;
+			break;
+
+		case '?':
+			fprintf(stderr, "%s: invalid option -%c\n",
+				progname, optopt);
+			usage();
+		}
+	} while (1);
+
+	if (optind == argc)
+		usage();
+
+	argv += optind;
+	while ((name = *argv++)) {
+		if (f_flag)
+			rv = realpath(name, link_name) ? strlen(link_name) : -1;
+		else
+			rv = readlink(name, link_name, sizeof link_name - 1);
+		if (rv < 0) {
+			perror(name);
+			exit(1);
+		}
+		link_name[rv] = '\n';
+		_fwrite(link_name, rv+1, stdout);
+	}
+
+	return 0;
+}