lavu/bprint: add append buffer function

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
Reveiwed-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 18 insertions, 0 deletions

diff --git a/libavutil/bprint.c b/libavutil/bprint.c
index cd91bc4a72..7786e3bce7 100644
--- a/libavutil/bprint.c
+++ b/libavutil/bprint.c
@@ -155,6 +155,24 @@ void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
     av_bprint_grow(buf, n);
 }
 
+void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
+{
+    unsigned room, real_n;
+
+    while (1) {
+        room = av_bprint_room(buf);
+        if (size < room)
+            break;
+        if (av_bprint_alloc(buf, size))
+            break;
+    }
+    if (room) {
+        real_n = FFMIN(size, room - 1);
+        memcpy(buf->str + buf->len, data, real_n);
+    }
+    av_bprint_grow(buf, size);
+}
+
 void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
 {
     unsigned room;