strbuf: add a case insensitive starts_with()

diff --git a/strbuf.c b/strbuf.c
index a20af696bc8cf9ca0bf6730c7db1b1021d79e185..0a24c3dd76a111050ffda86a0b16d1d570ccafb9 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -11,6 +11,15 @@ int starts_with(const char *str, const char *prefix)
                        return 0;
 }
 
+int istarts_with(const char *str, const char *prefix)
+{
+       for (; ; str++, prefix++)
+               if (!*prefix)
+                       return 1;
+               else if (tolower(*str) != tolower(*prefix))
+                       return 0;
+}
+
 int skip_to_optional_arg_default(const char *str, const char *prefix,
                                 const char **arg, const char *def)
 {