package/busybox/patches/190-ash_performance.patch

   1 diff -urN busybox.old/shell/ash.c busybox.dev/shell/ash.c
   2 --- busybox.old/shell/ash.c     2004-10-08 11:43:34.000000000 +0200
   3 +++ busybox.dev/shell/ash.c     2005-11-09 14:06:10.800983750 +0100
   4 @@ -1414,6 +1414,13 @@
   5
   6  #define NUMBUILTINS  (sizeof (builtincmd) / sizeof (struct builtincmd) )
   7
   8 +static const char *safe_applets[] = {
   9 +       "[", "test", "echo", "cat",
  10 +       "ln", "cp", "touch", "mkdir", "rm",
  11 +       "cut", "hexdump", "awk", "sort",
  12 +       "find", "xargs", "ls", "dd",
  13 +       "chown", "chmod"
  14 +};
  15
  16
  17  struct cmdentry {
  18 @@ -2050,6 +2057,19 @@
  19  static void exitshell(void) __attribute__((__noreturn__));
  20  static int decode_signal(const char *, int);
  21
  22 +
  23 +static int is_safe_applet(char *name)
  24 +{
  25 +       int n = sizeof(safe_applets) / sizeof(char *);
  26 +       int i;
  27 +       for (i = 0; i < n; i++)
  28 +               if (strcmp(safe_applets[i], name) == 0)
  29 +                       return 1;
  30 +
  31 +       return 0;
  32 +}
  33 +
  34 +
  35  /*
  36   * This routine is called when an error or an interrupt occurs in an
  37   * interactive shell and control is returned to the main command loop.
  38 @@ -3680,6 +3700,7 @@
  39         clearredir(1);
  40         envp = environment();
  41         if (strchr(argv[0], '/') != NULL
  42 +               || is_safe_applet(argv[0])
  43  #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
  44                 || find_applet_by_name(argv[0])
  45  #endif
  46 @@ -3721,6 +3742,18 @@
  47  tryexec(char *cmd, char **argv, char **envp)
  48  {
  49         int repeated = 0;
  50 +       struct BB_applet *a;
  51 +       int argc = 0;
  52 +       char **c;
  53 +
  54 +       if(strchr(cmd, '/') == NULL && is_safe_applet(cmd) && (a = find_applet_by_name(cmd)) != NULL) {
  55 +               c = argv;
  56 +               while (*c != NULL) {
  57 +                       c++; argc++;
  58 +               }
  59 +               bb_applet_name = "[";
  60 +               exit(a->main(argc, argv));
  61 +       }
  62  #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
  63         int flg_bb = 0;
  64         char *name = cmd;
  65 @@ -3919,6 +3952,12 @@
  66         }
  67  #endif
  68
  69 +       if (is_safe_applet(name)) {
  70 +               entry->cmdtype = CMDNORMAL;
  71 +               entry->u.index = -1;
  72 +               return;
  73 +       }
  74 +
  75         updatetbl = (path == pathval());
  76         if (!updatetbl) {
  77                 act |= DO_ALTPATH;