lavf/avio: add avio_vprintf()

This new function makes it possible to use avio_printf() functionality from
a function taking a variable list of arguments.

Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 13 insertions, 4 deletions

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 33bc3c2e20..b20b1a611a 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -1292,15 +1292,12 @@ int avio_closep(AVIOContext **s)
     return ret;
 }
 
-int avio_printf(AVIOContext *s, const char *fmt, ...)
+int avio_vprintf(AVIOContext *s, const char *fmt, va_list ap)
 {
-    va_list ap;
     AVBPrint bp;
 
     av_bprint_init(&bp, 0, INT_MAX);
-    va_start(ap, fmt);
     av_vbprintf(&bp, fmt, ap);
-    va_end(ap);
     if (!av_bprint_is_complete(&bp)) {
         av_bprint_finalize(&bp, NULL);
         s->error = AVERROR(ENOMEM);
@@ -1311,6 +1308,18 @@ int avio_printf(AVIOContext *s, const char *fmt, ...)
     return bp.len;
 }
 
+int avio_printf(AVIOContext *s, const char *fmt, ...)
+{
+    va_list ap;
+    int ret;
+
+    va_start(ap, fmt);
+    ret = avio_vprintf(s, fmt, ap);
+    va_end(ap);
+
+    return ret;
+}
+
 void avio_print_string_array(AVIOContext *s, const char *strings[])
 {
     for(; *strings; strings++)