win32: don't add extensions to filenames ending with a dot

A filename ending with a dot is a signal to spawnve not to try
adding extensions but to use the name unmodified.

The add_win32_extension function should follow the same rule.

2 files changed, 9 insertions, 2 deletions

diff --git a/include/mingw.h b/include/mingw.h
index c116e551a..b0e1fa53c 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -474,8 +474,9 @@ char **env_setenv(char **env, const char *name);
 const char *get_busybox_exec_path(void);
 void init_winsock(void);
 
-int has_exe_suffix(const char *p);
 int has_bat_suffix(const char *p);
+int has_exe_suffix(const char *p);
+int has_exe_suffix_or_dot(const char *name);
 char *add_win32_extension(const char *p);
 int has_exec_format(const char *name);
 
diff --git a/win32/mingw.c b/win32/mingw.c
index 22e62232d..260bc82d7 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -1033,6 +1033,12 @@ int has_exe_suffix(const char *name)
         return has_win_suffix(name, 0);
 }
 
+int has_exe_suffix_or_dot(const char *name)
+{
+        int len = strlen(name);
+        return (len > 0 && name[len-1] == '.') || has_win_suffix(name, 0);
+}
+
 /* check if path can be made into an executable by adding a suffix;
  * return an allocated string containing the path if it can;
  * return NULL if not.
@@ -1044,7 +1050,7 @@ char *add_win32_extension(const char *p)
         char *path;
         int i, len;
 
-        if (has_exe_suffix(p)) {
+        if (has_exe_suffix_or_dot(p)) {
                 return NULL;
         }