extern void setup_work_tree(void);
extern const char *setup_git_directory_gently(int *);
extern const char *setup_git_directory(void);
-extern const char *prefix_path(const char *prefix, int len, const char *path);
+extern char *prefix_path(const char *prefix, int len, const char *path);
extern const char *prefix_filename(const char *prefix, int len, const char *path);
extern int check_filename(const char *prefix, const char *name);
extern void verify_filename(const char *prefix, const char *name);
static int inside_git_dir = -1;
static int inside_work_tree = -1;
-const char *prefix_path(const char *prefix, int len, const char *path)
+char *prefix_path(const char *prefix, int len, const char *path)
{
const char *orig = path;
char *sanitized = xmalloc(len + strlen(path) + 1);