am doc: add a pointer to relevant hooks

diff --git a/mailmap.c b/mailmap.c
index 30614343213442806c5fbc28e904639d35c670cf..81890a6680029ec1d369a7eef11a4ec112847fb7 100644 (file)
--- a/mailmap.c
+++ b/mailmap.c
@@ -52,6 +52,20 @@ static void free_mailmap_entry(void *p, const char *s)
        string_list_clear_func(&me->namemap, free_mailmap_info);
 }
 
+/*
+ * On some systems (e.g. MinGW 4.0), string.h has _only_ inline
+ * definition of strcasecmp and no non-inline implementation is
+ * supplied anywhere, which is, eh, "unusual"; we cannot take an
+ * address of such a function to store it in namemap.cmp.  This is
+ * here as a workaround---do not assign strcasecmp directly to
+ * namemap.cmp until we know no systems that matter have such an
+ * "unusual" string.h.
+ */
+static int namemap_cmp(const char *a, const char *b)
+{
+       return strcasecmp(a, b);
+}
+
 static void add_mapping(struct string_list *map,
                        char *new_name, char *new_email,
                        char *old_name, char *old_email)
@@ -75,7 +89,7 @@ static void add_mapping(struct string_list *map,
                item = string_list_insert_at_index(map, index, old_email);
                me = xcalloc(1, sizeof(struct mailmap_entry));
                me->namemap.strdup_strings = 1;
-               me->namemap.cmp = strcasecmp;
+               me->namemap.cmp = namemap_cmp;
                item->util = me;
        }
 
@@ -153,8 +167,7 @@ static void read_mailmap_line(struct string_list *map, char *buffer,
                if (!strncmp(buffer, abbrev, abblen)) {
                        char *cp;
 
-                       if (repo_abbrev)
-                               free(*repo_abbrev);
+                       free(*repo_abbrev);
                        *repo_abbrev = xmalloc(len);
 
                        for (cp = buffer + abblen; isspace(*cp); cp++)
@@ -238,7 +251,7 @@ int read_mailmap(struct string_list *map, char **repo_abbrev)
        int err = 0;
 
        map->strdup_strings = 1;
-       map->cmp = strcasecmp;
+       map->cmp = namemap_cmp;
 
        if (!git_mailmap_blob && is_bare_repository())
                git_mailmap_blob = "HEAD:.mailmap";