Initial Upload

cat.c

@@ -0,0 +1,39 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+char buf[512];
+
+void cat(int fd) {
+    int n;
+
+    while ((n = read(fd, buf, sizeof(buf))) > 0) {
+        if (write(1, buf, n) != n) {
+            printf(1, "cat: write error\n");
+            exit();
+        }
+    }
+    if (n < 0) {
+        printf(1, "cat: read error\n");
+        exit();
+    }
+}
+
+int main(int argc, char *argv[]) {
+    int fd, i;
+
+    if (argc <= 1) {
+        cat(0);
+        exit();
+    }
+
+    for (i = 1; i < argc; i++) {
+        if ((fd = open(argv[i], 0)) < 0) {
+            printf(1, "cat: cannot open %s\n", argv[i]);
+            exit();
+        }
+        cat(fd);
+        close(fd);
+    }
+    exit();
+}