perf tools: Create write_padded routine out of __dsos__write_buildid_table

Will be used by other options where padding is needed.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1262629169-22797-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 709e325..942f7da 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -173,6 +173,20 @@ static int do_write(int fd, const void *buf, size_t size)
        return 0;
 }
 
+#define NAME_ALIGN 64
+
+static int write_padded(int fd, const void *bf, size_t count,
+                       size_t count_aligned)
+{
+       static const char zero_buf[NAME_ALIGN];
+       int err = do_write(fd, bf, count);
+
+       if (!err)
+               err = do_write(fd, zero_buf, count_aligned - count);
+
+       return err;
+}
+
 #define dsos__for_each_with_build_id(pos, head)        \
        list_for_each_entry(pos, head, node)    \
                if (!pos->has_build_id)         \
@@ -181,9 +195,7 @@ static int do_write(int fd, const void *buf, size_t size)
 
 static int __dsos__write_buildid_table(struct list_head *head, int fd)
 {
-#define NAME_ALIGN     64
        struct dso *pos;
-       static const char zero_buf[NAME_ALIGN];
 
        dsos__for_each_with_build_id(pos, head) {
                int err;
@@ -197,10 +209,8 @@ static int __dsos__write_buildid_table(struct list_head *head, int fd)
                err = do_write(fd, &b, sizeof(b));
                if (err < 0)
                        return err;
-               err = do_write(fd, pos->long_name, pos->long_name_len + 1);
-               if (err < 0)
-                       return err;
-               err = do_write(fd, zero_buf, len - pos->long_name_len - 1);
+               err = write_padded(fd, pos->long_name,
+                                  pos->long_name_len + 1, len);
                if (err < 0)
                        return err;
        }