win32: code shrink

Add a new function, has_path(), to detect that an executable name
doesn't require a path look-up.

Also, since is_absolute_path() is now only used in shell/ash.c move
its definition there from include/mingw.h.

Saves 128 bytes.

2 files changed, 9 insertions, 1 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index faa9f2b57..d9bb6e973 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -1803,3 +1803,11 @@ void *get_proc_addr(const char *dll, const char *function,
                 errno = ENOSYS;
         return proc->pfunction;
 }
+
+/* Return true if file is referenced using a path.  This means a path
+ * look-up isn't required. */
+int has_path(const char *file)
+{
+        return strchr(file, '/') || strchr(file, '\\') ||
+                                has_dos_drive_prefix(file);
+}
diff --git a/win32/process.c b/win32/process.c
index ac63a9c58..1118eb18a 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -348,7 +348,7 @@ mingw_spawn_1(int mode, const char *cmd, char *const *argv, char *const *envp)
                 return mingw_spawn_applet(mode, argv, envp);
         else
 #endif
-        if (strchr(cmd, '/') || strchr(cmd, '\\') || has_dos_drive_prefix(cmd)) {
+        if (has_path(cmd)) {
                 const char *path = auto_win32_extension(cmd);
                 return mingw_spawn_interpreter(mode, path ? path : cmd, argv, envp, 0);
         }