win32: add support for batch files

Support batch files with .bat and .cmd extensions, similar to
what's done for .exe and .com.

Check extensions in the same order as Windows' spawn function:
.com, .exe, .bat, .cmd.

1 files changed, 22 insertions, 18 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 4c9c76b8c..30f3b558b 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -2620,7 +2620,7 @@ path_advance(const char **path, const char *name)
 #endif
         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 
-        /* preserve space for .exe too */
+        /* reserve space for suffix on WIN32 */
         while (stackblocksize() < (ENABLE_PLATFORM_MINGW32 ? len+4 : len))
                 growstackblock();
         q = stackblock();
@@ -13646,7 +13646,6 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
         struct stat statb;
         int e;
         int updatetbl;
-        IF_PLATFORM_MINGW32(int len;)
         struct builtincmd *bcmd;
 
         /* If name contains a slash, don't use PATH or hash table */
@@ -13779,26 +13778,31 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
                         }
                 }
                 else {
-                        /* path_advance() has reserved space for .exe */
+                        extern const char win_suffix[4][4];
+                        int i, len;
+
+                        /* path_advance() has reserved space for suffix */
                         len = strlen(fullname);
-                        strcat(fullname, ".exe");
-                        if (stat(fullname, &statb) < 0) {
-                                memcpy(fullname+len, ".com", 5);
+                        fullname[len] = '.';
+                        for (i=0; i<4; ++i) {
+                                memcpy(fullname+len+1, win_suffix[i], 4);
+                                if (stat(fullname, &statb) == 0)
+                                        break;
+                        }
+                        fullname[len] = '\0';
+
+                        if (i == 4) {
+                                /* suffix didn't work, try without */
                                 if (stat(fullname, &statb) < 0) {
-                                        /* check for script */
-                                        fullname[len] = '\0';
-                                        if (stat(fullname, &statb) < 0) {
-                                                if (errno != ENOENT && errno != ENOTDIR)
-                                                        e = errno;
-                                                goto loop;
-                                        }
-                                        if (!file_is_executable(fullname)) {
-                                                e = ENOEXEC;
-                                                goto loop;
-                                        }
+                                        if (errno != ENOENT && errno != ENOTDIR)
+                                                e = errno;
+                                        goto loop;
+                                }
+                                if (!file_is_executable(fullname)) {
+                                        e = ENOEXEC;
+                                        goto loop;
                                 }
                         }
-                        fullname[len] = '\0';
                 }
 #else
                 while (stat(fullname, &statb) < 0) {