Unify all-zero buffers; add fwritezero()

We have a number of all-zero buffers in the code.  Put a single
all-zero buffer in nasmlib.c.  Additionally, add fwritezero()
which can be used to write an arbitrary number of all-zero bytes;
this prevents the situation where the all-zero buffer is simply
too small.

1 files changed, 4 insertions, 0 deletions

diff --git a/nasmlib.h b/nasmlib.h
index d001c4c..cb802b1 100644
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -329,4 +329,8 @@ extern struct dfmt *null_debug_arr[2];
 
 const char *prefix_name(int);
 
+#define ZERO_BUF_SIZE	4096
+extern const uint8_t zero_buffer[ZERO_BUF_SIZE];
+size_t fwritezero(size_t bytes, FILE *fp);
+
 #endif