add basename

apps/basename.c

@@ -0,0 +1,45 @@
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
+ * of the NCSA / University of Illinois License - see LICENSE.md
+ * Copyright (C) 2018 K. Lange
+ *
+ * basename - print file name
+ */
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char * argv[]) {
+	if (argc < 2) {
+		fprintf(stderr, "%s: expected argument\n", argv[0]);
+		return 1;
+	}
+
+	char * s = argv[1];
+	char * c = NULL;
+	do {
+		while (*s == '/') {
+			*s = '\0'; s++;
+			if (!*s) goto _done;
+		}
+		c = s;
+		s = strchr(c,'/');
+	} while (s);
+
+_done:
+	if (!c) {
+		/* Special case */
+		fprintf(stdout, "/\n");
+		return 0;
+	}
+
+	if (argc > 2) {
+		char * suffix = argv[2];
+		char * found = strstr(c + strlen(c) - strlen(suffix), suffix);
+		if (found && (found - c == (int)(strlen(c)-strlen(suffix)))) {
+			*found = '\0';
+		}
+	}
+
+	fprintf(stdout, "%s\n", c);
+	return 0;
+}