docs: fix filter-branch subdir example for exotic repo names

diff --git a/strbuf.c b/strbuf.c
index 9b3c4457f229041784edfa65218aa09de7a5eff8..07e8883ceb297bdde79f06ffa2d0519581ee60b9 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -63,7 +63,8 @@ void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
 
 void strbuf_grow(struct strbuf *sb, size_t extra)
 {
-       if (sb->len + extra + 1 <= sb->len)
+       if (unsigned_add_overflows(extra, 1) ||
+           unsigned_add_overflows(sb->len, extra + 1))
                die("you want to use way too much memory");
        if (!sb->alloc)
                sb->buf = NULL;
@@ -152,7 +153,7 @@ int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
                                   const void *data, size_t dlen)
 {
-       if (pos + len < pos)
+       if (unsigned_add_overflows(pos, len))
                die("you want to use way too much memory");
        if (pos > sb->len)
                die("`pos' is too far after the end of the buffer");