win32: allow execution of empty batch file to succeed

Microsoft Windows' spawnve returns ERROR_BAD_EXE_FORMAT when passed
an empty batch file.

Work around this by skipping spawnve and returning success.

1 files changed, 8 insertions, 0 deletions

diff --git a/win32/process.c b/win32/process.c
index fda38318a..f059bee18 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -237,6 +237,13 @@ spawnveq(int mode, const char *path, char *const *argv, char *const *env)
                         if (*s == '/')
                                 *s = '\\';
                 }
+
+                /* Another special case:  spawnve returns ENOEXEC when passed an
+                 * empty batch file.  Pretend it worked. */
+                if (st.st_size == 0) {
+                        ret = 0;
+                        goto done;
+                }
         }
 
         /*
@@ -250,6 +257,7 @@ spawnveq(int mode, const char *path, char *const *argv, char *const *env)
 
         ret = spawnve(mode, new_path ? new_path : path, new_argv, env);
 
+ done:
         for (i = 0;i < argc;i++)
                 if (new_argv[i] != argv[i])
                         free(new_argv[i]);