Switch to fopen/fread etc

Not quite finished yet -- this does things with stdin I didn't expect,
like not printing it line-by-line, and requiring two EOFs for some
reason.

1 files changed, 33 insertions, 0 deletions

diff --git a/cfp.c b/cfp.c
new file mode 100644
index 0000000..9d0d5a7
--- /dev/null
+++ b/cfp.c
@@ -0,0 +1,33 @@
+#include "cat.h"
+
+/* Function writes the contents of an opened file descriptor to stdout */
+int cfp(FILE *fp, void *buf) {
+    int br;
+
+    /* Use the buffer to read the file in blocks, writing each block to stdout
+     * as we go */
+    while ((br = fread(buf, 1, BUFLEN, fp)) > 0) {
+        if (fwrite(buf, 1, br, stdout) == 0) {
+            perror(__FUNCTION__);
+            return -1;
+        }
+    }
+
+    /* If the last return value for br() was -1, there was an error; 0 is what
+     * we expect */
+    if (ferror(fp) != 0 || ferror(stdout) != 0) {
+        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;
+}
+