There are currently 115 commands built into the git executable.
Before this commit, it was iterated over these commands in a linear
order, i.e. each command was checked.
As it turns out the commands are already sorted alphabetically, it is easy
to perform a binary search instead of linear searching.
This results in 7 lookups in the worst case.
Signed-off-by: Stefan Beller <stefanbeller@xxxxxxxxxxxxxx>
---
git.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/git.c b/git.c
index 2025f77..6d4de2b 100644
--- a/git.c
+++ b/git.c
@@ -309,9 +309,14 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
return 0;
}
+static int compare_internal_command(const void *name, const void *cmd) {
+ return strcmp((const char*)name, ((const struct cmd_struct*)cmd)->cmd);
+}
+
static void handle_internal_command(int argc, const char **argv)
{
const char *cmd = argv[0];
+ /* commands must be sorted alphabetically for binary search */
static struct cmd_struct commands[] = {
{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
{ "annotate", cmd_annotate, RUN_SETUP },
@@ -447,12 +452,12 @@ static void handle_internal_command(int argc, const char **argv)
argv[0] = cmd = "help";
}
- for (i = 0; i < ARRAY_SIZE(commands); i++) {
- struct cmd_struct *p = commands+i;
- if (strcmp(p->cmd, cmd))
- continue;
+ struct cmd_struct *p = bsearch(cmd, commands,
+ ARRAY_SIZE(commands), sizeof(struct cmd_struct),
+ compare_internal_command);
+
+ if (p)
exit(run_builtin(p, argc, argv));
- }
}
static void execv_dashed_external(const char **argv)
--
1.8.4.rc0.1.g8f6a3e5
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