cat(1p): refactor to get no args working

src/cat.c

@@ -27,9 +27,37 @@
 #include <string.h>
 #include <unistd.h>
 
+void cat(FILE *file, bool u) {
+	int byte = 0; /* variable for storing bytes as they are read */
+	int p = 0; /* index counter for bytes in buffered reading */
+	char buf[4096]; /* buffer for buffered reading */
+
+	while (byte != EOF) {
+		byte = fgetc(file);
+
+		if (u) {
+			putchar(byte);
+		} else {
+			if (p > sizeof(buf)) {
+				fputs(buf, stdout);
+				p = 0;
+			}
+
+			buf[p] = byte;
+			p += 1;
+		}
+	}
+
+	fwrite(buf, 1, p, stdout);
+	fflush(stdout);
+
+	if (file != stdin) { fclose(file); }
+}
+
 int main(int argc, char *argv[]) {
 	bool u = false;
 	int opt;
+	int i;
 
 	extern int optind;
 	while ((opt = getopt(argc, argv, "u")) != -1) {