ash: allow for filename extension in find_command

When searching for a command specified as a pathname also check for
the filename with a '.exe' or '.com' extension.  Previously even if
/bin/busybox.exe was present we got:

   $ command -v /bin/busybox
   $ echo $?
   127

This now becomes:

   $ command -v /bin/busybox
   /bin/busybox
   $ echo $?
   0

1 files changed, 9 insertions, 2 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 6cc29d25e..dc5561765 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -13262,7 +13262,7 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
         struct tblentry *cmdp;
         int idx;
         int prev;
-        char *fullname;
+        char *fullname IF_PLATFORM_MINGW32(= NULL);
         struct stat statb;
         int e;
         int updatetbl;
@@ -13273,7 +13273,11 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
         if (strchr(name, '/') || (ENABLE_PLATFORM_MINGW32 && strchr(name, '\\'))) {
                 entry->u.index = -1;
                 if (act & DO_ABS) {
-                        while (stat(name, &statb) < 0) {
+                        while (stat(name, &statb) < 0
+#if ENABLE_PLATFORM_MINGW32
+                                && (fullname=file_is_win32_executable(name)) == NULL
+#endif
+                                ) {
 #ifdef SYSV
                                 if (errno == EINTR)
                                         continue;
@@ -13281,6 +13285,9 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
                                 entry->cmdtype = CMDUNKNOWN;
                                 return;
                         }
+#if ENABLE_PLATFORM_MINGW32
+                        free(fullname);
+#endif
                 }
                 entry->cmdtype = CMDNORMAL;
                 return;