[libxml2] add --relative to testURI

[Daniel Veillard <veillard src gnome org>]

commit 25f13e77e6ce47e7a87559813e802ffb8c3b957f
Author: Thomas Holder <thomas holder schrodinger com>
Date:   Mon Nov 5 13:53:00 2018 +0100

    add --relative to testURI
    
    Example: testURI --relative --base file:///a/b/c file:///a/x/y
    
    Result: ../x/y

 testURI.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
---
diff --git a/testURI.c b/testURI.c
index d20989d4..0043b203 100644
--- a/testURI.c
+++ b/testURI.c
@@ -19,6 +19,7 @@
 static const char *base = NULL;
 static int escape = 0;
 static int debug = 0;
+static int relative = 0;
 
 static void handleURI(const char *str) {
     int ret;
@@ -57,7 +58,12 @@ static void handleURI(const char *str) {
            }
        }
     } else {
-       res = xmlBuildURI((xmlChar *)str, (xmlChar *) base);
+       if (relative) {
+           res = xmlBuildRelativeURI((xmlChar *)str, (xmlChar *) base);
+       } else {
+           res = xmlBuildURI((xmlChar *)str, (xmlChar *) base);
+       }
+
        if (res != NULL) {
            printf("%s\n", (char *) res);
        }
@@ -74,6 +80,11 @@ static void handleURI(const char *str) {
 int main(int argc, char **argv) {
     int i, arg = 1;
 
+    if ((argc > arg) && (argv[arg] != NULL) &&
+       (!strcmp(argv[arg], "--relative"))) {
+       arg++;
+       relative++;
+    }
     if ((argc > arg) && (argv[arg] != NULL) &&
        ((!strcmp(argv[arg], "-base")) || (!strcmp(argv[arg], "--base")))) {
        arg++;