This requires us to pass the struct down to decode_header() and
convert_to_utf8() callchain.

Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 builtin/mailinfo.c | 40 +++++++++++++++++++---------------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/builtin/mailinfo.c b/builtin/mailinfo.c
index 5302c03..7e01efa 100644
--- a/builtin/mailinfo.c
+++ b/builtin/mailinfo.c
@@ -9,8 +9,6 @@
 
 static FILE *cmitmsg, *patchfile;
 
-static const char *metainfo_charset;
-
 struct mailinfo {
        FILE *input;
        FILE *output;
@@ -22,6 +20,7 @@ struct mailinfo {
        int add_message_id;
        int use_scissors;
        int use_inbody_headers; /* defaults to 1 */
+       const char *metainfo_charset;
 
        char *message_id;
        int patch_lines;
@@ -293,7 +292,7 @@ static void cleanup_space(struct strbuf *sb)
        }
 }
 
-static void decode_header(struct strbuf *line);
+static void decode_header(struct mailinfo *mi, struct strbuf *line);
 static const char *header[MAX_HDR_PARSED] = {
        "From","Subject","Date",
 };
@@ -336,7 +335,7 @@ static int check_header(struct mailinfo *mi,
                         * normalize the meta information to utf8.
                         */
                        strbuf_add(&sb, line->buf + len + 2, line->len - len - 
2);
-                       decode_header(&sb);
+                       decode_header(mi, &sb);
                        handle_header(&hdr_data[i], &sb);
                        ret = 1;
                        goto check_header_out;
@@ -347,7 +346,7 @@ static int check_header(struct mailinfo *mi,
        if (cmp_header(line, "Content-Type")) {
                len = strlen("Content-Type: ");
                strbuf_add(&sb, line->buf + len, line->len - len);
-               decode_header(&sb);
+               decode_header(mi, &sb);
                strbuf_insert(&sb, 0, "Content-Type: ", len);
                handle_content_type(&sb);
                ret = 1;
@@ -356,7 +355,7 @@ static int check_header(struct mailinfo *mi,
        if (cmp_header(line, "Content-Transfer-Encoding")) {
                len = strlen("Content-Transfer-Encoding: ");
                strbuf_add(&sb, line->buf + len, line->len - len);
-               decode_header(&sb);
+               decode_header(mi, &sb);
                handle_content_transfer_encoding(&sb);
                ret = 1;
                goto check_header_out;
@@ -364,7 +363,7 @@ static int check_header(struct mailinfo *mi,
        if (cmp_header(line, "Message-Id")) {
                len = strlen("Message-Id: ");
                strbuf_add(&sb, line->buf + len, line->len - len);
-               decode_header(&sb);
+               decode_header(mi, &sb);
                handle_message_id(mi, &sb);
                ret = 1;
                goto check_header_out;
@@ -520,23 +519,24 @@ static struct strbuf *decode_b_segment(const struct 
strbuf *b_seg)
        return out;
 }
 
-static void convert_to_utf8(struct strbuf *line, const char *charset)
+static void convert_to_utf8(struct mailinfo *mi,
+                           struct strbuf *line, const char *charset)
 {
        char *out;
 
-       if (!charset || !*charset)
+       if (!mi->metainfo_charset || !charset || !*charset)
                return;
 
-       if (same_encoding(metainfo_charset, charset))
+       if (same_encoding(mi->metainfo_charset, charset))
                return;
-       out = reencode_string(line->buf, metainfo_charset, charset);
+       out = reencode_string(line->buf, mi->metainfo_charset, charset);
        if (!out)
                die("cannot convert from %s to %s",
-                   charset, metainfo_charset);
+                   charset, mi->metainfo_charset);
        strbuf_attach(line, out, strlen(out), strlen(out));
 }
 
-static void decode_header(struct strbuf *it)
+static void decode_header(struct mailinfo *mi, struct strbuf *it)
 {
        char *in, *ep, *cp;
        struct strbuf outbuf = STRBUF_INIT, *dec;
@@ -599,8 +599,7 @@ static void decode_header(struct strbuf *it)
                        dec = decode_q_segment(&piecebuf, 1);
                        break;
                }
-               if (metainfo_charset)
-                       convert_to_utf8(dec, charset_q.buf);
+               convert_to_utf8(mi, dec, charset_q.buf);
 
                strbuf_addbuf(&outbuf, dec);
                strbuf_release(dec);
@@ -774,8 +773,7 @@ static int handle_commit_msg(struct mailinfo *mi, struct 
strbuf *line)
                mi->header_stage = 0;
 
        /* normalize the log message to UTF-8. */
-       if (metainfo_charset)
-               convert_to_utf8(line, charset.buf);
+       convert_to_utf8(mi, line, charset.buf);
 
        if (mi->use_scissors && is_scissors_line(line)) {
                int i;
@@ -1074,7 +1072,7 @@ int cmd_mailinfo(int argc, const char **argv, const char 
*prefix)
        setup_mailinfo(&mi);
 
        def_charset = get_commit_output_encoding();
-       metainfo_charset = def_charset;
+       mi.metainfo_charset = def_charset;
 
        while (1 < argc && argv[1][0] == '-') {
                if (!strcmp(argv[1], "-k"))
@@ -1084,11 +1082,11 @@ int cmd_mailinfo(int argc, const char **argv, const 
char *prefix)
                else if (!strcmp(argv[1], "-m") || !strcmp(argv[1], 
"--message-id"))
                        mi.add_message_id = 1;
                else if (!strcmp(argv[1], "-u"))
-                       metainfo_charset = def_charset;
+                       mi.metainfo_charset = def_charset;
                else if (!strcmp(argv[1], "-n"))
-                       metainfo_charset = NULL;
+                       mi.metainfo_charset = NULL;
                else if (starts_with(argv[1], "--encoding="))
-                       metainfo_charset = argv[1] + 11;
+                       mi.metainfo_charset = argv[1] + 11;
                else if (!strcmp(argv[1], "--scissors"))
                        mi.use_scissors = 1;
                else if (!strcmp(argv[1], "--no-scissors"))
-- 
2.6.1-320-g86a1181

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