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mailmap: always return a plain mail address from map_user()

The callers of map_user() give email and name to it, and expect to get the
up-to-date email and/or name to be used in their output. The function
rewrites the given buffers in place. To optimize the majority of cases,
the function returns 0 when it did not do anything, and it returns 1 when
the caller should use the updated contents.

The 'email' input to the function is terminated by '>' or a NUL (whichever
comes first) for historical reasons, but when a rewrite happens, the value
is replaced with the mailbox inside the <> pair.  However, it failed to
meet this expectation when it only rewrote the name part without rewriting
the email part, and the email in the input was terminated by '>'.

This causes an extra '>' to appear in the output of "blame -e", because the
caller does send in '>'-terminated email, and when the function returned 1
to tell it that rewriting happened, it appends '>' that is necessary when
the email part was rewritten.

The patch looks bigger than it actually is, because this change makes a
variable that points at the end of the email part in the input 'p' live
much longer than it used to, deserving a more descriptive name.

Noticed and diagnosed by Felipe Contreras and Jeff King.

Signed-off-by: Junio C Hamano <>
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commit f026358ef20e0c252388a41fcc8eff125b00927c 1 parent 04f6785
Junio C Hamano authored
Showing with 10 additions and 8 deletions.
  1. +10 −8 mailmap.c
18 mailmap.c
@@ -190,27 +190,27 @@ void clear_mailmap(struct string_list *map)
int map_user(struct string_list *map,
char *email, int maxlen_email, char *name, int maxlen_name)
- char *p;
+ char *end_of_email;
struct string_list_item *item;
struct mailmap_entry *me;
char buf[1024], *mailbuf;
int i;
/* figure out space requirement for email */
- p = strchr(email, '>');
- if (!p) {
+ end_of_email = strchr(email, '>');
+ if (!end_of_email) {
/* email passed in might not be wrapped in <>, but end with a \0 */
- p = memchr(email, '\0', maxlen_email);
- if (!p)
+ end_of_email = memchr(email, '\0', maxlen_email);
+ if (!end_of_email)
return 0;
- if (p - email + 1 < sizeof(buf))
+ if (end_of_email - email + 1 < sizeof(buf))
mailbuf = buf;
- mailbuf = xmalloc(p - email + 1);
+ mailbuf = xmalloc(end_of_email - email + 1);
/* downcase the email address */
- for (i = 0; i < p - email; i++)
+ for (i = 0; i < end_of_email - email; i++)
mailbuf[i] = tolower(email[i]);
mailbuf[i] = 0;
@@ -236,6 +236,8 @@ int map_user(struct string_list *map,
if (maxlen_email && mi->email)
strlcpy(email, mi->email, maxlen_email);
+ else
+ *end_of_email = '\0';
if (maxlen_name && mi->name)
strlcpy(name, mi->name, maxlen_name);
debug_mm("map_user: to '%s' <%s>\n", name, mi->email ? mi->email : "");
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