strbuf: add strbuf_reencode helper

diff --git a/strbuf.c b/strbuf.c
index ee96dcfb816625436582833d812a7156513d5d39..fc7290f57a07353ab7bbf86b7c743ec913ee396c 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "refs.h"
+#include "utf8.h"
 
 int starts_with(const char *str, const char *prefix)
 {
@@ -106,6 +107,22 @@ void strbuf_ltrim(struct strbuf *sb)
        sb->buf[sb->len] = '\0';
 }
 
+int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
+{
+       char *out;
+       int len;
+
+       if (same_encoding(from, to))
+               return 0;
+
+       out = reencode_string_len(sb->buf, sb->len, to, from, &len);
+       if (!out)
+               return -1;
+
+       strbuf_attach(sb, out, len, len);
+       return 0;
+}
+
 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
                                 int terminator, int max)
 {