From 77afb175f45b03d7a92f88a90f664d8be083baf5 Mon Sep 17 00:00:00 2001
From: Sven Geuer <68420948@users.noreply.github.com>
Date: Wed, 25 Feb 2026 21:14:05 +0100
Subject: [PATCH] Fix fail to build with glibc 2.43

Glibc 2.43 comes with '#define _XOPEN_SOURCE 800' which causes the
following errors:

In file included from utmp.c:31:
../../src/snoopy.h:31:10: error: '_XOPEN_SOURCE' redefined [-Werror]
   31 | #define  _XOPEN_SOURCE   700
      |          ^~~~~~~~~~~~~
In file included from /usr/include/utmp.h:21,
                 from utmp-snoopy.h:27,
                 from utmp.c:26:
/usr/include/features.h:234:10: note: this is the location of the previous definition
  234 | # define _XOPEN_SOURCE  800
      |          ^~~~~~~~~~~~~

domain.c: In function 'snoopy_datasource_domain':
domain.c:126:17: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
  126 |         hashPtr = strchr(linePtr, '#');
      |                 ^

This patch guards the '#define  _XOPEN_SOURCE   700' in snoopy.h and
drops the 'const' qualifier from the variable 'linePtr' resulting in
building snoopy successfully using glibc 2.43.
---
 src/datasource/domain.c | 2 +-
 src/snoopy.h            | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/datasource/domain.c b/src/datasource/domain.c
index 0022b038..b918ce1d 100644
--- a/src/datasource/domain.c
+++ b/src/datasource/domain.c
@@ -114,7 +114,7 @@ int snoopy_datasource_domain (char * const resultBuf, size_t resultBufSize, __at
 
 
     /* Read line by line */
-    const char *linePtr;
+    char *linePtr;
     char *hashPtr;
     char *lineEntryPtr;
     char *savePtr;
diff --git a/src/snoopy.h b/src/snoopy.h
index c5adfcb5..28a5298b 100644
--- a/src/snoopy.h
+++ b/src/snoopy.h
@@ -28,7 +28,9 @@
  * - prevents GCC from complaining about not using strerror_r return value
  * - enables strdup() presence
  */
+#ifndef  _XOPEN_SOURCE
 #define  _XOPEN_SOURCE   700
+#endif