diff -Naur a/xmllint.c b/xmllint.c
--- a/xmllint.c	2024-08-05 15:16:19.271124192 +0800
+++ b/xmllint.c	2024-08-05 15:20:00.325968893 +0800
@@ -602,7 +602,7 @@
     len = strlen(buffer);
     snprintf(&buffer[len], sizeof(buffer) - len, "\n");
     cur = input->cur;
-    while ((*cur == '\n') || (*cur == '\r'))
+    while ((cur > base) && ((*cur == '\n') || (*cur == '\r')))
 	cur--;
     n = 0;
     while ((cur != base) && (n++ < 80)) {