1 files changed, 41 insertions, 0 deletions
diff --git a/cat.c b/cat.c
new file mode 100644
index 0000000..6f8ea55
--- /dev/null
+++ b/cat.c
@@ -0,0 +1,41 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "panic.h"
+
+
+void cat(int fd, char * name)
+{
+	char buffer[4096];
+	size_t length;
+	while (0 < (length=read(fd, buffer, sizeof(buffer))))
+		if (length != write(1, buffer, length))
+			panic("write: %s: %s", name, strerror(errno));
+	if (0 > length)
+		panic("read: %s: %s", name, strerror(errno));
+}
+
+
+int main(int argc, char * argv[])
+{
+	int i;
+	int fd;
+	if (1 == argc)
+		cat(0, "<stdin>");
+	else for (i = 1; i < argc; ++i)
+	{
+		fd = open(argv[i], O_RDONLY);
+		if (0 > fd)
+			panic("open: %s: %s", argv[i], strerror(errno));
+		else
+		{
+			cat(fd, argv[i]);
+			close(fd);
+		}
+	}
+}