Use log output encoding in --pretty=email headers.

Private functions add_rfc2047() and pretty_print_commit() assumed
they are only emitting UTF-8.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/commit.c b/commit.c
index 496d37aa020871aed111002c2be0380366a70baa..9b2b842e7dcc153a12b35394a2e3f88f146b6225 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -464,20 +464,29 @@ static int get_one_line(const char *msg, unsigned long len)
        return ret;
 }
 
+/* High bit set, or ISO-2022-INT */
+static int non_ascii(int ch)
+{
+       ch = (ch & 0xff);
+       return ((ch & 0x80) || (ch == 0x1b));
+}
+
 static int is_rfc2047_special(char ch)
 {
-       return ((ch & 0x80) || (ch == '=') || (ch == '?') || (ch == '_'));
+       return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 }
 
-static int add_rfc2047(char *buf, const char *line, int len)
+static int add_rfc2047(char *buf, const char *line, int len,
+                      const char *encoding)
 {
        char *bp = buf;
        int i, needquote;
-       static const char q_utf8[] = "=?utf-8?q?";
+       char q_encoding[128];
+       const char *q_encoding_fmt = "=?%s?q?";
 
        for (i = needquote = 0; !needquote && i < len; i++) {
-               unsigned ch = line[i];
-               if (ch & 0x80)
+               int ch = line[i];
+               if (non_ascii(ch))
                        needquote++;
                if ((i + 1 < len) &&
                    (ch == '=' && line[i+1] == '?'))
@@ -486,8 +495,11 @@ static int add_rfc2047(char *buf, const char *line, int len)
        if (!needquote)
                return sprintf(buf, "%.*s", len, line);
 
-       memcpy(bp, q_utf8, sizeof(q_utf8)-1);
-       bp += sizeof(q_utf8)-1;
+       i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
+       if (sizeof(q_encoding) < i)
+               die("Insanely long encoding name %s", encoding);
+       memcpy(bp, q_encoding, i);
+       bp += i;
        for (i = 0; i < len; i++) {
                unsigned ch = line[i] & 0xFF;
                if (is_rfc2047_special(ch)) {
@@ -505,7 +517,8 @@ static int add_rfc2047(char *buf, const char *line, int len)
 }
 
 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
-                        const char *line, int relative_date)
+                        const char *line, int relative_date,
+                        const char *encoding)
 {
        char *date;
        int namelen;
@@ -533,7 +546,8 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
                filler = "";
                strcpy(buf, "From: ");
                ret = strlen(buf);
-               ret += add_rfc2047(buf + ret, line, display_name_length);
+               ret += add_rfc2047(buf + ret, line, display_name_length,
+                                  encoding);
                memcpy(buf + ret, name_tail, namelen - display_name_length);
                ret += namelen - display_name_length;
                buf[ret++] = '\n';
@@ -668,21 +682,18 @@ static char *replace_encoding_header(char *buf, char *encoding)
        return buf;
 }
 
-static char *logmsg_reencode(const struct commit *commit)
+static char *logmsg_reencode(const struct commit *commit,
+                            char *output_encoding)
 {
        char *encoding;
        char *out;
-       char *output_encoding = (git_log_output_encoding
-                                ? git_log_output_encoding
-                                : git_commit_encoding);
+       char *utf8 = "utf-8";
 
-       if (!output_encoding)
-               output_encoding = "utf-8";
-       else if (!*output_encoding)
+       if (!*output_encoding)
                return NULL;
        encoding = get_header(commit, "encoding");
        if (!encoding)
-               return NULL;
+               encoding = utf8;
        if (!strcmp(encoding, output_encoding))
                out = strdup(commit->buffer);
        else
@@ -691,7 +702,8 @@ static char *logmsg_reencode(const struct commit *commit)
        if (out)
                out = replace_encoding_header(out, output_encoding);
 
-       free(encoding);
+       if (encoding != utf8)
+               free(encoding);
        if (!out)
                return NULL;
        return out;
@@ -711,8 +723,15 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
        int parents_shown = 0;
        const char *msg = commit->buffer;
        int plain_non_ascii = 0;
-       char *reencoded = logmsg_reencode(commit);
+       char *reencoded;
+       char *encoding;
 
+       encoding = (git_log_output_encoding
+                   ? git_log_output_encoding
+                   : git_commit_encoding);
+       if (!encoding)
+               encoding = "utf-8";
+       reencoded = logmsg_reencode(commit, encoding);
        if (reencoded)
                msg = reencoded;
 
@@ -738,7 +757,7 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
                                    i + 1 < len && msg[i+1] == '\n')
                                        in_body = 1;
                        }
-                       else if (ch & 0x80) {
+                       else if (non_ascii(ch)) {
                                plain_non_ascii = 1;
                                break;
                        }
@@ -797,13 +816,15 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
                                offset += add_user_info("Author", fmt,
                                                        buf + offset,
                                                        line + 7,
-                                                       relative_date);
+                                                       relative_date,
+                                                       encoding);
                        if (!memcmp(line, "committer ", 10) &&
                            (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
                                offset += add_user_info("Commit", fmt,
                                                        buf + offset,
                                                        line + 10,
-                                                       relative_date);
+                                                       relative_date,
+                                                       encoding);
                        continue;
                }
 
@@ -826,7 +847,8 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
                        int slen = strlen(subject);
                        memcpy(buf + offset, subject, slen);
                        offset += slen;
-                       offset += add_rfc2047(buf + offset, line, linelen);
+                       offset += add_rfc2047(buf + offset, line, linelen,
+                                             encoding);
                }
                else {
                        memset(buf + offset, ' ', indent);
@@ -837,11 +859,17 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
                if (fmt == CMIT_FMT_ONELINE)
                        break;
                if (subject && plain_non_ascii) {
-                       static const char header[] =
-                               "Content-Type: text/plain; charset=UTF-8\n"
+                       int sz;
+                       char header[512];
+                       const char *header_fmt =
+                               "Content-Type: text/plain; charset=%s\n"
                                "Content-Transfer-Encoding: 8bit\n";
-                       memcpy(buf + offset, header, sizeof(header)-1);
-                       offset += sizeof(header)-1;
+                       sz = snprintf(header, sizeof(header), header_fmt,
+                                     encoding);
+                       if (sizeof(header) < sz)
+                               die("Encoding name %s too long", encoding);
+                       memcpy(buf + offset, header, sz);
+                       offset += sz;
                }
                if (after_subject) {
                        int slen = strlen(after_subject);