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authorRené Scharfe <rene.scharfe@lsrfire.ath.cx>2010-02-19 23:20:44 +0100
committerJunio C Hamano <gitster@pobox.com>2010-02-20 09:22:44 -0800
commit462749b728f72079a67202d4d0d1ef19ef993f61 (patch)
treed88473ea817cf1c86f8cd3f51c906ef3cccd34f5
parent68ad5e1e9c10e8a640703aadbdf8b8366014373b (diff)
downloadgit-462749b728f72079a67202d4d0d1ef19ef993f61.tar.gz
git-462749b728f72079a67202d4d0d1ef19ef993f61.tar.xz
utf8.c: speculatively assume utf-8 in strbuf_add_wrapped_text()
is_utf8() works by calling utf8_width() for each character at the supplied location. In strbuf_add_wrapped_text(), we do that anyway while wrapping the lines. So instead of checking the encoding beforehand, optimistically assume that it's utf-8 and wrap along until an invalid character is hit, and when that happens start over. This pays off if the text consists only of valid utf-8 characters. The following command was run against the Linux kernel repo with git 1.7.0: $ time git log --format='%b' v2.6.32 >/dev/null real 0m2.679s user 0m2.580s sys 0m0.100s $ time git log --format='%w(60,4,8)%b' >/dev/null real 0m4.342s user 0m4.230s sys 0m0.110s And with this patch series: $ time git log --format='%w(60,4,8)%b' >/dev/null real 0m3.741s user 0m3.630s sys 0m0.110s So the cost of wrapping is reduced to 70% in this case. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--utf8.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/utf8.c b/utf8.c
index 9f64f59d6..6db9cd9a0 100644
--- a/utf8.c
+++ b/utf8.c
@@ -324,16 +324,21 @@ static size_t display_mode_esc_sequence_len(const char *s)
* consumed (and no extra indent is necessary for the first line).
*/
int strbuf_add_wrapped_text(struct strbuf *buf,
- const char *text, int indent, int indent2, int width)
+ const char *text, int indent1, int indent2, int width)
{
- int w = indent, assume_utf8 = is_utf8(text);
- const char *bol = text, *space = NULL;
+ int indent, w, assume_utf8 = 1;
+ const char *bol, *space, *start = text;
+ size_t orig_len = buf->len;
if (width <= 0) {
- strbuf_add_indented_text(buf, text, indent, indent2);
+ strbuf_add_indented_text(buf, text, indent1, indent2);
return 1;
}
+retry:
+ bol = text;
+ w = indent = indent1;
+ space = NULL;
if (indent < 0) {
w = -indent;
space = text;
@@ -385,9 +390,15 @@ new_line:
}
continue;
}
- if (assume_utf8)
+ if (assume_utf8) {
w += utf8_width(&text, NULL);
- else {
+ if (!text) {
+ assume_utf8 = 0;
+ text = start;
+ strbuf_setlen(buf, orig_len);
+ goto retry;
+ }
+ } else {
w++;
text++;
}