lavf: replace rename() with ff_rename()

The new function wraps errno so that its value is correctly reported
when other functions overwrite it (eg. in case of logging).

CC: libav-stable@libav.org
Bug-Id: CID 1135748
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavformat/hdsenc.c

@@ -204,8 +204,7 @@ static int write_manifest(AVFormatContext *s, int final)
     avio_printf(out, "</manifest>\n");
     avio_flush(out);
     avio_close(out);
-    rename(temp_filename, filename);
-    return 0;
+    return ff_rename(temp_filename, filename);
 }
 
 static void update_size(AVIOContext *out, int64_t pos)
@@ -286,8 +285,7 @@ static int write_abst(AVFormatContext *s, OutputStream *os, int final)
     update_size(out, afrt_pos);
     update_size(out, 0);
     avio_close(out);
-    rename(temp_filename, filename);
-    return 0;
+    return ff_rename(temp_filename, filename);
 }
 
 static int init_file(AVFormatContext *s, OutputStream *os, int64_t start_ts)
@@ -481,7 +479,9 @@ static int hds_flush(AVFormatContext *s, OutputStream *os, int final,
 
     snprintf(target_filename, sizeof(target_filename),
              "%s/stream%dSeg1-Frag%d", s->filename, index, os->fragment_index);
-    rename(os->temp_filename, target_filename);
+    ret = ff_rename(os->temp_filename, target_filename);
+    if (ret < 0)
+        return ret;
     add_fragment(os, target_filename, os->frag_start_ts, end_ts - os->frag_start_ts);
 
     if (!final) {

libavformat/internal.h

@@ -351,4 +351,18 @@ enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
  */
 int ff_generate_avci_extradata(AVStream *st);
 
+/**
+ * Wrap errno on rename() error.
+ *
+ * @param oldpath source path
+ * @param newpath destination path
+ * @return        0 or AVERROR on failure
+ */
+static inline int ff_rename(const char *oldpath, const char *newpath)
+{
+    if (rename(oldpath, newpath) == -1)
+        return AVERROR(errno);
+    return 0;
+}
+
 #endif /* AVFORMAT_INTERNAL_H */

libavformat/smoothstreamingenc.c

@@ -34,6 +34,7 @@
 
 #include "libavutil/opt.h"
 #include "libavutil/avstring.h"
+#include "libavutil/file.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/intreadwrite.h"
 
@@ -282,8 +283,7 @@ static int write_manifest(AVFormatContext *s, int final)
     avio_printf(out, "</SmoothStreamingMedia>\n");
     avio_flush(out);
     avio_close(out);
-    rename(temp_filename, filename);
-    return 0;
+    return ff_rename(temp_filename, filename);
 }
 
 static int ism_write_header(AVFormatContext *s)
@@ -540,7 +540,9 @@ static int ism_flush(AVFormatContext *s, int final)
         snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
         snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
         copy_moof(s, filename, header_filename, moof_size);
-        rename(filename, target_filename);
+        ret = ff_rename(filename, target_filename);
+        if (ret < 0)
+            break;
         add_fragment(os, target_filename, header_filename, start_ts, duration,
                      os->cur_start_pos, size);
     }