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add a busybox ash performance hack

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@2398 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2005-11-09 13:25:00 +00:00
parent e6f2e06d24
commit 6f0ddd19ee
1 changed files with 77 additions and 0 deletions
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77
openwrt/package/busybox/patches/190-ash_performance.patch Normal file
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@ -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;