perf: add test for writing the index

diff --git a/quote.c b/quote.c
index b281a8fe454e39728ce112915c7a5efb0f9c8bc0..53b98a5b840d8fd4d73fab27348b657501923dca 100644 (file)
--- a/quote.c
+++ b/quote.c
@@ -453,3 +453,40 @@ void tcl_quote_buf(struct strbuf *sb, const char *src)
        }
        strbuf_addch(sb, '"');
 }
+
+void basic_regex_quote_buf(struct strbuf *sb, const char *src)
+{
+       char c;
+
+       if (*src == '^') {
+               /* only beginning '^' is special and needs quoting */
+               strbuf_addch(sb, '\\');
+               strbuf_addch(sb, *src++);
+       }
+       if (*src == '*')
+               /* beginning '*' is not special, no quoting */
+               strbuf_addch(sb, *src++);
+
+       while ((c = *src++)) {
+               switch (c) {
+               case '[':
+               case '.':
+               case '\\':
+               case '*':
+                       strbuf_addch(sb, '\\');
+                       strbuf_addch(sb, c);
+                       break;
+
+               case '$':
+                       /* only the end '$' is special and needs quoting */
+                       if (*src == '\0')
+                               strbuf_addch(sb, '\\');
+                       strbuf_addch(sb, c);
+                       break;
+
+               default:
+                       strbuf_addch(sb, c);
+                       break;
+               }
+       }
+}