1 files changed, 60 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/03.1.c b/reference/C/CONTRIB/OR_USING_C/03.1.c
new file mode 100644
index 0000000..f1b7844
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/03.1.c
@@ -0,0 +1,60 @@
+/* Change <sys/file.h> to <sys/fcntl.h> if you're on System V.
+ */
+#include <sys/file.h>
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+    int n;
+    int from, to;
+    char buf[1024];
+
+    /*
+     * Check our arguments.  Note that to write the error
+     * message we can't just use "%s" as we did in Example
+     * 2-3; we have to write each string separately.
+     */
+    if (argc != 3) {
+        write(2, "Usage: ", 7);
+        write(2, *argv, strlen(*argv));
+        write(2, " from-file to-file\n", 19);
+        exit(1);
+    }
+
+    /*
+     * Open the from-file for reading.
+     */
+    if ((from = open(argv[1], O_RDONLY)) < 0) {
+        perror(argv[1]);
+        exit(1);
+    }
+
+    /*
+     * Open the to-file for appending.  If to-file does
+     * not exist, open will create it with mode 644
+     * (-rw-r--r--).  Note that we specify the mode
+     * in octal, not decimal
+     */
+    if ((to = open(argv[2], O_WRONLY|O_CREAT|O_APPEND, 0644)) < 0) {
+        perror(argv[2]);
+        exit(1);
+    }
+
+    /*
+     * Now read a buffer-full at a time from the from-file,
+     * and write it to the to-file.  Note that we only
+     * write the number of characters read read in,
+     * rather than always writing 1024 characters.
+     */
+    while ((n = read(from, buf, sizeof(buf))) > 0)
+        write(to, buf, n);
+
+    /*
+     * Now close the files.
+     */
+    close(from);
+    close(to);
+    exit(0);
+}
+