The handle_builtin() starts from striping of command extension if
STRIP_EXTENSION is enabled. As this is an OS dependent, let's move
to the git-compat-util.h as all similar functions to do handle_builtin()
more cleaner.
---
 git-compat-util.h | 18 ++++++++++++++++++
 git.c             | 13 +------------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/git-compat-util.h b/git-compat-util.h
index 658d03b..57f2fda 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -323,6 +323,24 @@ extern char *gitbasename(char *);
 
 #ifndef STRIP_EXTENSION
 #define STRIP_EXTENSION ""
+static inline const char *strip_extension(const char **argv)
+{
+       return argv[0];
+}
+#else
+static inline const char *strip_extension(const char **argv)
+{
+       static const char ext[] = STRIP_EXTENSION;
+       int ext_len = strlen(argv[0]) - strlen(ext);
+
+       if (ext_len > 0 && !strcmp(argv[0] + ext_len, ext)) {
+               char *argv0 = xstrdup(argv[0]);
+               argv[0] = argv0;
+               argv0[ext_len] = '\0';
+       }
+
+       return argv[0];
+}
 #endif
 
 #ifndef has_dos_drive_prefix
diff --git a/git.c b/git.c
index 8751ef0..a4d2a46 100644
--- a/git.c
+++ b/git.c
@@ -506,19 +506,8 @@ int is_builtin(const char *s)
 
 static void handle_builtin(int argc, const char **argv)
 {
-       const char *cmd = argv[0];
-       int i;
-       static const char ext[] = STRIP_EXTENSION;
        struct cmd_struct *builtin;
-
-       if (sizeof(ext) > 1) {
-               i = strlen(argv[0]) - strlen(ext);
-               if (i > 0 && !strcmp(argv[0] + i, ext)) {
-                       char *argv0 = xstrdup(argv[0]);
-                       argv[0] = cmd = argv0;
-                       argv0[i] = '\0';
-               }
-       }
+       const char *cmd = strip_extension(argv);
 
        /* Turn "git cmd --help" into "git help cmd" */
        if (argc > 1 && !strcmp(argv[1], "--help")) {
-- 
2.4.4.764.gf6c74eb.dirty

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