Introduce ALPM_BUFFER_SIZE constant

This takes the place of three previously used constants:
ARCHIVE_DEFAULT_BYTES_PER_BLOCK, BUFFER_SIZE, and CPBUFSIZE.

In libarchive 3.0, the first constant will be no more, so we can ensure
we are forward-compatible by removing our usage of it now. The rest are
unified for consistency.

By default, we will use the value of BUFSIZ provided by <stdio.h>, which
is 8192 on Linux. If that is undefined, a default value is provided.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/libalpm/util.h b/lib/libalpm/util.h
index 2a2d3a93..26fa9044 100644
--- a/lib/libalpm/util.h
+++ b/lib/libalpm/util.h
@@ -75,6 +75,13 @@
 
 #define CHECK_HANDLE(handle, action) do { if(!(handle)) { action; } (handle)->pm_errno = 0; } while(0)
 
+/** Standard buffer size used throughout the library. */
+#ifdef BUFSIZ
+#define ALPM_BUFFER_SIZE BUFSIZ
+#else
+#define ALPM_BUFFER_SIZE 8192
+#endif
+
 /**
  * Used as a buffer/state holder for _alpm_archive_fgets().
  */