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Makefile

@@ -0,0 +1,5 @@
+CC?=cc
+CFLAGS?=-Os -s
+
+all:
+	$(CC) $(CFLAGS) cutecat.c -o cutecat

cutecat.c

@@ -0,0 +1,87 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+
+unsigned int d_flag;
+char eyes[] = {'U', 'O'};
+
+void OwO(char *buf, off_t len) {
+	if (d_flag)
+		return;
+
+	for (int i = 0; i < len / 10; i++) {
+		size_t i = rand() % len;
+
+		if (i + 3 < len && !isspace(buf[i]) && !isspace(buf[i + 2])) {
+			char eye = eyes[rand() % sizeof(eyes)];
+
+			buf[i] = eye;
+			buf[i + 1] = 'w';
+			buf[i + 2] = eye;
+		}
+	}
+}
+
+int cat(const char *path) {
+	int fd = STDIN_FILENO;
+
+	if (strcmp(path, "-"))
+		fd = open(path, O_RDONLY);
+
+	if (fd < 0) {
+		fprintf(stderr, "cat: %s: %s\n", path, strerror(errno));
+		return 1;
+	}
+
+	char buf[513];
+	off_t len = 0;
+	while ((len = read(fd, buf, sizeof(buf))) > 0) {
+		OwO(buf, len);
+		if (write(STDOUT_FILENO, buf, len) != len) {
+			fprintf(stderr, "cat: %s\n", strerror(errno));
+			return 1;
+		}
+	}
+
+	if (strcmp(path, "-"))
+		close(fd);
+
+	return 0;
+}
+
+int main(int argc, char **argv) {
+	int opt;
+	while ((opt = getopt(argc, argv, "d")) != -1) {
+		switch (opt) {
+			case 'd':
+				d_flag = 1;
+				break;
+
+			default:
+				printf("cutecat [file1 file2...]\n\t[-d Default mode]\n");
+				return 0;
+		}
+	}
+
+	argv += optind;
+	argc -= optind;
+
+	if (!d_flag)
+		srand(getpid());
+
+	if (argc == 0)
+		return cat("-");
+
+	else {
+		int ret = 0;
+		for (int i = 0; i < argc; i++)
+			if (cat(argv[i]))
+				ret = 1;
+
+		return ret;
+	}
+}