First commit of that cat(1) clone I'm making

1 files changed, 30 insertions, 0 deletions

diff --git a/cfd.c b/cfd.c
new file mode 100644
index 0000000..9e8baa6
--- /dev/null
+++ b/cfd.c
@@ -0,0 +1,30 @@
+#include "cat.h"
+
+/* Function writes the contents of an opened file descriptor to stdout */
+int cfd(int fd, void *buf) {
+    int br;
+
+    /* Use the buffer to read the file in blocks, writing each block to stdout
+     * as we go */
+    while ((br = read(fd, buf, BUFLEN)) > 0) {
+        fwrite(buf, 1, br, stdout);
+    }
+
+    /* If the last return value for br() was -1, there was an error; 0 is what
+     * we expect */
+    if (br == -1) {
+        perror(__FUNCTION__);
+        return -1;
+    }
+
+    /* Force a write of any still-buffered data to stdout */
+    if (fflush(stdout) != 0) {
+        perror(__FUNCTION__);
+        return -1;
+    }
+
+    /* Return success, since apparently nothing went wrong before we got here
+     * */
+    return 0;
+}
+