util: add gz_readline

The idea is to provide a more or less drop in replacement for readline
to read from zlib/gzip streams.  Take the opportunity to replace
malloc with talloc.

1 files changed, 25 insertions, 0 deletions

diff --git a/util/zlib-extra.h b/util/zlib-extra.h
new file mode 100644
index 00000000..aedfd48f
--- /dev/null
+++ b/util/zlib-extra.h
@@ -0,0 +1,25 @@
+#ifndef _ZLIB_EXTRA_H
+#define _ZLIB_EXTRA_H
+
+#include "util.h"
+#include <zlib.h>
+
+/* Like getline, but read from a gzFile. Allocation is with talloc.
+ * Returns:
+ *
+ *   UTIL_SUCCESS, UTIL_OUT_OF_MEMORY, UTIL_ERRNO, UTIL_GZERROR
+ *			Consult util.h for description
+ *
+ *   UTIL_EOF		End of file encountered before
+ *			any characters read
+ */
+util_status_t
+gz_getline (void *ctx, char **lineptr, ssize_t *bytes_read, gzFile stream);
+
+/* return a suitable error string based on the return status
+ *  from gz_readline
+ */
+
+const char *
+gz_error_string (util_status_t status, gzFile stream);
+#endif