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use skip_prefix to avoid repeated calculations 

In some cases, we use starts_with to check for a prefix, and
then use an already-calculated prefix length to advance a
pointer past the prefix. There are no magic numbers or
duplicated strings here, but we can still make the code
simpler and more obvious by using skip_prefix.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2014-06-18 15:57:17 -04:00 committed by Junio C Hamano
parent 6d87780399
commit de8118e153
2 changed files with 6 additions and 8 deletions
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11
help.c
View File

@ -129,7 +129,6 @@ static void list_commands_in_dir(struct cmdnames *cmds,
const char *path,
const char *prefix)
{
int prefix_len;
DIR *dir = opendir(path);
struct dirent *de;
struct strbuf buf = STRBUF_INIT;
@ -139,15 +138,15 @@ static void list_commands_in_dir(struct cmdnames *cmds,
return;
if (!prefix)
prefix = "git-";
prefix_len = strlen(prefix);
strbuf_addf(&buf, "%s/", path);
len = buf.len;
while ((de = readdir(dir)) != NULL) {
const char *ent;
int entlen;
if (!starts_with(de->d_name, prefix))
if (!skip_prefix(de->d_name, prefix, &ent))
continue;
strbuf_setlen(&buf, len);
@ -155,11 +154,11 @@ static void list_commands_in_dir(struct cmdnames *cmds,
if (!is_executable(buf.buf))
continue;
entlen = strlen(de->d_name) - prefix_len;
if (has_extension(de->d_name, ".exe"))
entlen = strlen(ent);
if (has_extension(ent, ".exe"))
entlen -= 4;
add_cmdname(cmds, de->d_name + prefix_len, entlen);
add_cmdname(cmds, ent, entlen);
}
closedir(dir);
strbuf_release(&buf);

3
http.c
View File

@ -1087,11 +1087,10 @@ static int update_url_from_redirect(struct strbuf *base,
if (!strcmp(asked, got->buf))
return 0;
if (!starts_with(asked, base->buf))
if (!skip_prefix(asked, base->buf, &tail))
die("BUG: update_url_from_redirect: %s is not a superset of %s",
asked, base->buf);
tail = asked + base->len;
tail_len = strlen(tail);
if (got->len < tail_len ||