builtin-mailinfo.c: compare character encodings case insensitively

When converting between character encodings, git tests whether the "from"
encoding and the "to" encoding have the same name.  git should perform this
test case insensitively so that e.g. utf-8 is not seen as a different
encoding than UTF-8.

Additionally, it is not necessary to call tolower() anymore on the encodings
extracted from the mail message.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index 5ebc8b53cc820933d5098cbbfc77ff49c18b6b85..c68187e2e937704bfa8382950151e78349901345 100644 (file)
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -193,8 +193,7 @@ static void handle_content_type(struct strbuf *line)
                *content_top = boundary;
                boundary = NULL;
        }
-       if (slurp_attr(line->buf, "charset=", &charset))
-               strbuf_tolower(&charset);
+       slurp_attr(line->buf, "charset=", &charset);
 
        if (boundary) {
                strbuf_release(boundary);
@@ -494,7 +493,7 @@ static void convert_to_utf8(struct strbuf *line, const char *charset)
                        return;
        }
 
-       if (!strcmp(metainfo_charset, charset))
+       if (!strcasecmp(metainfo_charset, charset))
                return;
        out = reencode_string(line->buf, metainfo_charset, charset);
        if (!out)
@@ -550,7 +549,6 @@ static int decode_header_bq(struct strbuf *it)
                if (cp + 3 - it->buf > it->len)
                        goto decode_header_bq_out;
                strbuf_add(&charset_q, ep, cp - ep);
-               strbuf_tolower(&charset_q);
 
                encoding = cp[1];
                if (!encoding || cp[2] != '?')