help: drop prepend function in favor of xstrfmt

This function predates xstrfmt, and its functionality is a
subset. Let's just use xstrfmt.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/help.c b/builtin/help.c
index 3422e73..fba8c01 100644 (file)
--- a/builtin/help.c
+++ b/builtin/help.c
@@ -295,16 +295,6 @@ static int is_git_command(const char *s)
                is_in_cmdlist(&other_cmds, s);
 }
 
-static const char *prepend(const char *prefix, const char *cmd)
-{
-       size_t pre_len = strlen(prefix);
-       size_t cmd_len = strlen(cmd);
-       char *p = xmalloc(pre_len + cmd_len + 1);
-       memcpy(p, prefix, pre_len);
-       strcpy(p + pre_len, cmd);
-       return p;
-}
-
 static const char *cmd_to_page(const char *git_cmd)
 {
        if (!git_cmd)
@@ -312,9 +302,9 @@ static const char *cmd_to_page(const char *git_cmd)
        else if (starts_with(git_cmd, "git"))
                return git_cmd;
        else if (is_git_command(git_cmd))
-               return prepend("git-", git_cmd);
+               return xstrfmt("git-%s", git_cmd);
        else
-               return prepend("git", git_cmd);
+               return xstrfmt("git%s", git_cmd);
 }
 
 static void setup_man_path(void)