add an busybox ash performance hack

SVN-Revision: 2397

diff --git a/openwrt/package/busybox/patches/190-ash_performance.patch b/openwrt/package/busybox/patches/190-ash_performance.patch
new file mode 100644 (file)
index 0000000..7f2954d
--- /dev/null
+++ b/openwrt/package/busybox/patches/190-ash_performance.patch
@@ -0,0 +1,77 @@
+diff -urN busybox.old/shell/ash.c busybox.dev/shell/ash.c
+--- busybox.old/shell/ash.c    2004-10-08 11:43:34.000000000 +0200
++++ busybox.dev/shell/ash.c    2005-11-09 14:06:10.800983750 +0100
+@@ -1414,6 +1414,13 @@
+ 
+ #define NUMBUILTINS  (sizeof (builtincmd) / sizeof (struct builtincmd) )
+ 
++static const char *safe_applets[] = { 
++      "[", "test", "echo", "cat",
++      "ln", "cp", "touch", "mkdir", "rm",
++      "cut", "hexdump", "awk", "sort",
++      "find", "xargs", "ls", "dd",
++      "chown", "chmod"
++};
+ 
+ 
+ struct cmdentry {
+@@ -2050,6 +2057,19 @@
+ static void exitshell(void) __attribute__((__noreturn__));
+ static int decode_signal(const char *, int);
+ 
++
++static int is_safe_applet(char *name)
++{
++      int n = sizeof(safe_applets) / sizeof(char *);
++      int i;
++      for (i = 0; i < n; i++)
++              if (strcmp(safe_applets[i], name) == 0)
++                      return 1;
++
++      return 0;
++}
++
++
+ /*
+  * This routine is called when an error or an interrupt occurs in an
+  * interactive shell and control is returned to the main command loop.
+@@ -3680,6 +3700,7 @@
+       clearredir(1);
+       envp = environment();
+       if (strchr(argv[0], '/') != NULL
++              || is_safe_applet(argv[0])
+ #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+               || find_applet_by_name(argv[0])
+ #endif
+@@ -3721,6 +3742,18 @@
+ tryexec(char *cmd, char **argv, char **envp)
+ {
+       int repeated = 0;
++      struct BB_applet *a;
++      int argc = 0;
++      char **c;
++      
++      if(strchr(cmd, '/') == NULL && is_safe_applet(cmd) && (a = find_applet_by_name(cmd)) != NULL) {
++              c = argv;
++              while (*c != NULL) {
++                      c++; argc++;
++              }
++              bb_applet_name = "[";
++              exit(a->main(argc, argv));
++      }
+ #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+       int flg_bb = 0;
+       char *name = cmd;
+@@ -3919,6 +3952,12 @@
+       }
+ #endif
+ 
++      if (is_safe_applet(name)) {
++              entry->cmdtype = CMDNORMAL;
++              entry->u.index = -1;
++              return;
++      }
++
+       updatetbl = (path == pathval());
+       if (!updatetbl) {
+               act |= DO_ALTPATH;