From 0fd094f4765737c00f852838c739c702a2e7376f Mon Sep 17 00:00:00 2001
From: Mooneer Salem <mooneer@gmail.com>
Date: Thu, 22 May 2025 08:10:53 -0700
Subject: [PATCH] Fix issue where Hamlib attempts to use memory returned by
 setlocale() after being freed.

---
 include/num_stdio.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/num_stdio.h b/include/num_stdio.h
index 4ba063a95..f564f097a 100644
--- a/include/num_stdio.h
+++ b/include/num_stdio.h
@@ -23,6 +23,9 @@
 #define _NUM_STDIO_H 1
 
 #include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
 
 /*
  * This header file is internal to Hamlib and its backends,
@@ -36,27 +39,42 @@
 #define num_sscanf(a...) \
     ({ int __ret; char *__savedlocale; \
        __savedlocale = setlocale(LC_NUMERIC, NULL); \
+       if (__savedlocale != NULL) { \
+           __savedlocale = strdup(__savedlocale); \
+           assert(__savedlocale != NULL); \
+       } \
        setlocale(LC_NUMERIC, "C"); \
        __ret = sscanf(a); \
        setlocale(LC_NUMERIC, __savedlocale); \
+       if (__savedlocale != NULL) free(__savedlocale); \
        __ret; \
      })
 
 #define num_sprintf(s, a...) \
     ({ int __ret; char *__savedlocale; \
        __savedlocale = setlocale(LC_NUMERIC, NULL); \
+       if (__savedlocale != NULL) { \
+           __savedlocale = strdup(__savedlocale); \
+           assert(__savedlocale != NULL); \
+       } \
        setlocale(LC_NUMERIC, "C"); \
        __ret = sprintf(s, a); \
        setlocale(LC_NUMERIC, __savedlocale); \
+       if (__savedlocale != NULL) free(__savedlocale); \
        __ret; \
      })
 
 #define num_snprintf(s, n, a...) \
     ({ int __ret; char *__savedlocale; \
        __savedlocale = setlocale(LC_NUMERIC, NULL); \
+       if (__savedlocale != NULL) { \
+           __savedlocale = strdup(__savedlocale); \
+           assert(__savedlocale != NULL); \
+       } \
        setlocale(LC_NUMERIC, "C"); \
        __ret = snprintf(s, n, a); \
        setlocale(LC_NUMERIC, __savedlocale); \
+       if (__savedlocale != NULL) free(__savedlocale); \
        __ret; \
      })