merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 6 insertions, 9 deletions

diff --git a/third_party/git/utf8.c b/third_party/git/utf8.c
index 3b42fadffd7c..5b39361ada0b 100644
--- a/third_party/git/utf8.c
+++ b/third_party/git/utf8.c
@@ -95,13 +95,11 @@ static int git_wcwidth(ucs_char_t ch)
 		return -1;
 
 	/* binary search in table of non-spacing characters */
-	if (bisearch(ch, zero_width, sizeof(zero_width)
-				/ sizeof(struct interval) - 1))
+	if (bisearch(ch, zero_width, ARRAY_SIZE(zero_width) - 1))
 		return 0;
 
 	/* binary search in table of double width characters */
-	if (bisearch(ch, double_width, sizeof(double_width)
-				/ sizeof(struct interval) - 1))
+	if (bisearch(ch, double_width, ARRAY_SIZE(double_width) - 1))
 		return 2;
 
 	return 1;
@@ -413,11 +411,10 @@ out:
  */
 static int same_utf_encoding(const char *src, const char *dst)
 {
-	if (istarts_with(src, "utf") && istarts_with(dst, "utf")) {
-		/* src[3] or dst[3] might be '\0' */
-		int i = (src[3] == '-' ? 4 : 3);
-		int j = (dst[3] == '-' ? 4 : 3);
-		return !strcasecmp(src+i, dst+j);
+	if (skip_iprefix(src, "utf", &src) && skip_iprefix(dst, "utf", &dst)) {
+		skip_prefix(src, "-", &src);
+		skip_prefix(dst, "-", &dst);
+		return !strcasecmp(src, dst);
 	}
 	return 0;
 }