From 994459e4cedf5cced518820f531b75feb521bea1 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 11 Jan 2016 14:35:56 +0100
Subject: common: add mp_tag_str() utility function

---
 common/common.c | 17 +++++++++++++++++
 common/common.h |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/common/common.c b/common/common.c
index c943235c2a..7a651e9781 100644
--- a/common/common.c
+++ b/common/common.c
@@ -23,6 +23,7 @@
 
 #include "talloc.h"
 #include "misc/bstr.h"
+#include "misc/ctype.h"
 #include "common/common.h"
 
 #define appendf(ptr, ...) \
@@ -258,3 +259,19 @@ char *mp_strerror_buf(char *buf, size_t buf_size, int errnum)
     av_strerror(AVERROR(errnum), buf, buf_size);
     return buf;
 }
+
+char *mp_tag_str_buf(char *buf, size_t buf_size, uint32_t tag)
+{
+    if (buf_size < 1)
+        return buf;
+    buf[0] = '\0';
+    for (int n = 0; n < 4; n++) {
+        uint8_t val = (tag >> (n * 8)) & 0xFF;
+        if (mp_isalnum(val) || val == '_' || val == ' ') {
+            mp_snprintf_cat(buf, buf_size, "%c", val);
+        } else {
+            mp_snprintf_cat(buf, buf_size, "[%d]", val);
+        }
+    }
+    return buf;
+}
diff --git a/common/common.h b/common/common.h
index 7312b85ec8..920ad76a56 100644
--- a/common/common.h
+++ b/common/common.h
@@ -90,4 +90,7 @@ bool mp_append_escaped_string(void *talloc_ctx, struct bstr *dst,
 char *mp_strerror_buf(char *buf, size_t buf_size, int errnum);
 #define mp_strerror(e) mp_strerror_buf((char[80]){0}, 80, e)
 
+char *mp_tag_str_buf(char *buf, size_t buf_size, uint32_t tag);
+#define mp_tag_str(t) mp_tag_str_buf((char[22]){0}, 22, t)
+
 #endif /* MPLAYER_MPCOMMON_H */
-- 
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